FreeBSD/Linux Kernel Cross Reference
sys/dev/ciss/ciss.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2001 Michael Smith
      * Copyright (c) 2004 Paul Saab
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $FreeBSD$
     */
    
    /*
     * Common Interface for SCSI-3 Support driver.
     *
     * CISS claims to provide a common interface between a generic SCSI
     * transport and an intelligent host adapter.
     *
     * This driver supports CISS as defined in the document "CISS Command
     * Interface for SCSI-3 Support Open Specification", Version 1.04,
     * Valence Number 1, dated 20001127, produced by Compaq Computer
     * Corporation.  This document appears to be a hastily and somewhat
     * arbitrarlily cut-down version of a larger (and probably even more
     * chaotic and inconsistent) Compaq internal document.  Various
     * details were also gleaned from Compaq's "cciss" driver for Linux.
     *
     * We provide a shim layer between the CISS interface and CAM,
     * offloading most of the queueing and being-a-disk chores onto CAM.
     * Entry to the driver is via the PCI bus attachment (ciss_probe,
     * ciss_attach, etc) and via the CAM interface (ciss_cam_action,
     * ciss_cam_poll).  The Compaq CISS adapters are, however, poor SCSI
     * citizens and we have to fake up some responses to get reasonable
     * behaviour out of them.  In addition, the CISS command set is by no
     * means adequate to support the functionality of a RAID controller,
     * and thus the supported Compaq adapters utilise portions of the
     * control protocol from earlier Compaq adapter families.
     *
     * Note that we only support the "simple" transport layer over PCI.
     * This interface (ab)uses the I2O register set (specifically the post
     * queues) to exchange commands with the adapter.  Other interfaces
     * are available, but we aren't supposed to know about them, and it is
     * dubious whether they would provide major performance improvements
     * except under extreme load.
     *
     * Currently the only supported CISS adapters are the Compaq Smart
     * Array 5* series (5300, 5i, 532).  Even with only three adapters,
     * Compaq still manage to have interface variations.
     *
     *
     * Thanks must go to Fred Harris and Darryl DeVinney at Compaq, as
     * well as Paul Saab at Yahoo! for their assistance in making this
     * driver happen.
     *
     * More thanks must go to John Cagle at HP for the countless hours
     * spent making this driver "work" with the MSA* series storage
     * enclosures.  Without his help (and nagging), this driver could not
     * be used with these enclosures.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/stat.h>
    #include <sys/kthread.h>
    #include <sys/queue.h>
    #include <sys/sysctl.h>
    
    #include <cam/cam.h>
    #include <cam/cam_ccb.h>
    #include <cam/cam_periph.h>
    #include <cam/cam_sim.h>
    #include <cam/cam_xpt_sim.h>
    #include <cam/scsi/scsi_all.h>
    #include <cam/scsi/scsi_message.h>
    
    #include <machine/bus.h>
    #include <machine/endian.h>
   #include <machine/resource.h>
   #include <sys/rman.h>
   
   #include <dev/pci/pcireg.h>
   #include <dev/pci/pcivar.h>
   
   #include <dev/ciss/cissreg.h>
   #include <dev/ciss/cissio.h>
   #include <dev/ciss/cissvar.h>
   
   #ifdef CISS_DEBUG
   #include "opt_ddb.h"
   #endif
   
   static MALLOC_DEFINE(CISS_MALLOC_CLASS, "ciss_data",
       "ciss internal data buffers");
   
   /* pci interface */
   static int      ciss_lookup(device_t dev);
   static int      ciss_probe(device_t dev);
   static int      ciss_attach(device_t dev);
   static int      ciss_detach(device_t dev);
   static int      ciss_shutdown(device_t dev);
   
   /* (de)initialisation functions, control wrappers */
   static int      ciss_init_pci(struct ciss_softc *sc);
   static int      ciss_setup_msix(struct ciss_softc *sc);
   static int      ciss_init_perf(struct ciss_softc *sc);
   static int      ciss_wait_adapter(struct ciss_softc *sc);
   static int      ciss_flush_adapter(struct ciss_softc *sc);
   static int      ciss_init_requests(struct ciss_softc *sc);
   static void     ciss_command_map_helper(void *arg, bus_dma_segment_t *segs,
                                           int nseg, int error);
   static int      ciss_identify_adapter(struct ciss_softc *sc);
   static int      ciss_init_logical(struct ciss_softc *sc);
   static int      ciss_init_physical(struct ciss_softc *sc);
   static int      ciss_filter_physical(struct ciss_softc *sc, struct ciss_lun_report *cll);
   static int      ciss_identify_logical(struct ciss_softc *sc, struct ciss_ldrive *ld);
   static int      ciss_get_ldrive_status(struct ciss_softc *sc,  struct ciss_ldrive *ld);
   static int      ciss_update_config(struct ciss_softc *sc);
   static int      ciss_accept_media(struct ciss_softc *sc, struct ciss_ldrive *ld);
   static void     ciss_init_sysctl(struct ciss_softc *sc);
   static void     ciss_soft_reset(struct ciss_softc *sc);
   static void     ciss_free(struct ciss_softc *sc);
   static void     ciss_spawn_notify_thread(struct ciss_softc *sc);
   static void     ciss_kill_notify_thread(struct ciss_softc *sc);
   
   /* request submission/completion */
   static int      ciss_start(struct ciss_request *cr);
   static void     ciss_done(struct ciss_softc *sc, cr_qhead_t *qh);
   static void     ciss_perf_done(struct ciss_softc *sc, cr_qhead_t *qh);
   static void     ciss_intr(void *arg);
   static void     ciss_perf_intr(void *arg);
   static void     ciss_perf_msi_intr(void *arg);
   static void     ciss_complete(struct ciss_softc *sc, cr_qhead_t *qh);
   static int      _ciss_report_request(struct ciss_request *cr, int *command_status, int *scsi_status, const char *func);
   static int      ciss_synch_request(struct ciss_request *cr, int timeout);
   static int      ciss_poll_request(struct ciss_request *cr, int timeout);
   static int      ciss_wait_request(struct ciss_request *cr, int timeout);
   #if 0
   static int      ciss_abort_request(struct ciss_request *cr);
   #endif
   
   /* request queueing */
   static int      ciss_get_request(struct ciss_softc *sc, struct ciss_request **crp);
   static void     ciss_preen_command(struct ciss_request *cr);
   static void     ciss_release_request(struct ciss_request *cr);
   
   /* request helpers */
   static int      ciss_get_bmic_request(struct ciss_softc *sc, struct ciss_request **crp,
                                         int opcode, void **bufp, size_t bufsize);
   static int      ciss_user_command(struct ciss_softc *sc, IOCTL_Command_struct *ioc);
   
   /* DMA map/unmap */
   static int      ciss_map_request(struct ciss_request *cr);
   static void     ciss_request_map_helper(void *arg, bus_dma_segment_t *segs,
                                           int nseg, int error);
   static void     ciss_unmap_request(struct ciss_request *cr);
   
   /* CAM interface */
   static int      ciss_cam_init(struct ciss_softc *sc);
   static void     ciss_cam_rescan_target(struct ciss_softc *sc,
                                          int bus, int target);
   static void     ciss_cam_action(struct cam_sim *sim, union ccb *ccb);
   static int      ciss_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio);
   static int      ciss_cam_emulate(struct ciss_softc *sc, struct ccb_scsiio *csio);
   static void     ciss_cam_poll(struct cam_sim *sim);
   static void     ciss_cam_complete(struct ciss_request *cr);
   static void     ciss_cam_complete_fixup(struct ciss_softc *sc, struct ccb_scsiio *csio);
   static int      ciss_name_device(struct ciss_softc *sc, int bus, int target);
   
   /* periodic status monitoring */
   static void     ciss_periodic(void *arg);
   static void     ciss_nop_complete(struct ciss_request *cr);
   static void     ciss_disable_adapter(struct ciss_softc *sc);
   static void     ciss_notify_event(struct ciss_softc *sc);
   static void     ciss_notify_complete(struct ciss_request *cr);
   static int      ciss_notify_abort(struct ciss_softc *sc);
   static int      ciss_notify_abort_bmic(struct ciss_softc *sc);
   static void     ciss_notify_hotplug(struct ciss_softc *sc, struct ciss_notify *cn);
   static void     ciss_notify_logical(struct ciss_softc *sc, struct ciss_notify *cn);
   static void     ciss_notify_physical(struct ciss_softc *sc, struct ciss_notify *cn);
   
   /* debugging output */
   #ifdef DDB
   static void     ciss_print_request(struct ciss_request *cr);
   #endif
   static void     ciss_print_ldrive(struct ciss_softc *sc, struct ciss_ldrive *ld);
   static const char *ciss_name_ldrive_status(int status);
   static int      ciss_decode_ldrive_status(int status);
   static const char *ciss_name_ldrive_org(int org);
   static const char *ciss_name_command_status(int status);
   
   /*
    * PCI bus interface.
    */
   static device_method_t ciss_methods[] = {
       /* Device interface */
       DEVMETHOD(device_probe,     ciss_probe),
       DEVMETHOD(device_attach,    ciss_attach),
       DEVMETHOD(device_detach,    ciss_detach),
       DEVMETHOD(device_shutdown,  ciss_shutdown),
       { 0, 0 }
   };
   
   static driver_t ciss_pci_driver = {
       "ciss",
       ciss_methods,
       sizeof(struct ciss_softc)
   };
   
   /*
    * Control device interface.
    */
   static d_open_t         ciss_open;
   static d_close_t        ciss_close;
   static d_ioctl_t        ciss_ioctl;
   
   static struct cdevsw ciss_cdevsw = {
           .d_version =    D_VERSION,
           .d_flags =      0,
           .d_open =       ciss_open,
           .d_close =      ciss_close,
           .d_ioctl =      ciss_ioctl,
           .d_name =       "ciss",
   };
   
   /*
    * This tunable can be set at boot time and controls whether physical devices
    * that are marked hidden by the firmware should be exposed anyways.
    */
   static unsigned int ciss_expose_hidden_physical = 0;
   TUNABLE_INT("hw.ciss.expose_hidden_physical", &ciss_expose_hidden_physical);
   
   static unsigned int ciss_nop_message_heartbeat = 0;
   TUNABLE_INT("hw.ciss.nop_message_heartbeat", &ciss_nop_message_heartbeat);
   
   /*
    * This tunable can force a particular transport to be used:
    * <= 0 : use default
    *    1 : force simple
    *    2 : force performant
    */
   static int ciss_force_transport = 0;
   TUNABLE_INT("hw.ciss.force_transport", &ciss_force_transport);
   
   /*
    * This tunable can force a particular interrupt delivery method to be used:
    * <= 0 : use default
    *    1 : force INTx
    *    2 : force MSIX
    */
   static int ciss_force_interrupt = 0;
   TUNABLE_INT("hw.ciss.force_interrupt", &ciss_force_interrupt);
   
   
   /************************************************************************
    * CISS adapters amazingly don't have a defined programming interface
    * value.  (One could say some very despairing things about PCI and
    * people just not getting the general idea.)  So we are forced to
    * stick with matching against subvendor/subdevice, and thus have to
    * be updated for every new CISS adapter that appears.
    */
   #define CISS_BOARD_UNKNWON      0
   #define CISS_BOARD_SA5          1
   #define CISS_BOARD_SA5B         2
   #define CISS_BOARD_NOMSI        (1<<4)
   #define CISS_BOARD_SIMPLE       (1<<5)
   
   static struct
   {
       u_int16_t   subvendor;
       u_int16_t   subdevice;
       int         flags;
       char        *desc;
   } ciss_vendor_data[] = {
       { 0x0e11, 0x4070, CISS_BOARD_SA5|CISS_BOARD_NOMSI|CISS_BOARD_SIMPLE,
                                                           "Compaq Smart Array 5300" },
       { 0x0e11, 0x4080, CISS_BOARD_SA5B|CISS_BOARD_NOMSI, "Compaq Smart Array 5i" },
       { 0x0e11, 0x4082, CISS_BOARD_SA5B|CISS_BOARD_NOMSI, "Compaq Smart Array 532" },
       { 0x0e11, 0x4083, CISS_BOARD_SA5B|CISS_BOARD_NOMSI, "HP Smart Array 5312" },
       { 0x0e11, 0x4091, CISS_BOARD_SA5,   "HP Smart Array 6i" },
       { 0x0e11, 0x409A, CISS_BOARD_SA5,   "HP Smart Array 641" },
       { 0x0e11, 0x409B, CISS_BOARD_SA5,   "HP Smart Array 642" },
       { 0x0e11, 0x409C, CISS_BOARD_SA5,   "HP Smart Array 6400" },
       { 0x0e11, 0x409D, CISS_BOARD_SA5,   "HP Smart Array 6400 EM" },
       { 0x103C, 0x3211, CISS_BOARD_SA5,   "HP Smart Array E200i" },
       { 0x103C, 0x3212, CISS_BOARD_SA5,   "HP Smart Array E200" },
       { 0x103C, 0x3213, CISS_BOARD_SA5,   "HP Smart Array E200i" },
       { 0x103C, 0x3214, CISS_BOARD_SA5,   "HP Smart Array E200i" },
       { 0x103C, 0x3215, CISS_BOARD_SA5,   "HP Smart Array E200i" },
       { 0x103C, 0x3220, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3222, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3223, CISS_BOARD_SA5,   "HP Smart Array P800" },
       { 0x103C, 0x3225, CISS_BOARD_SA5,   "HP Smart Array P600" },
       { 0x103C, 0x3230, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3231, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3232, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3233, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3234, CISS_BOARD_SA5,   "HP Smart Array P400" },
       { 0x103C, 0x3235, CISS_BOARD_SA5,   "HP Smart Array P400i" },
       { 0x103C, 0x3236, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3237, CISS_BOARD_SA5,   "HP Smart Array E500" },
       { 0x103C, 0x3238, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3239, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x323A, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x323B, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x323C, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x323D, CISS_BOARD_SA5,   "HP Smart Array P700m" },
       { 0x103C, 0x3241, CISS_BOARD_SA5,   "HP Smart Array P212" },
       { 0x103C, 0x3243, CISS_BOARD_SA5,   "HP Smart Array P410" },
       { 0x103C, 0x3245, CISS_BOARD_SA5,   "HP Smart Array P410i" },
       { 0x103C, 0x3247, CISS_BOARD_SA5,   "HP Smart Array P411" },
       { 0x103C, 0x3249, CISS_BOARD_SA5,   "HP Smart Array P812" },
       { 0x103C, 0x324A, CISS_BOARD_SA5,   "HP Smart Array P712m" },
       { 0x103C, 0x324B, CISS_BOARD_SA5,   "HP Smart Array" },
       { 0x103C, 0x3350, CISS_BOARD_SA5,   "HP Smart Array P222" },
       { 0x103C, 0x3351, CISS_BOARD_SA5,   "HP Smart Array P420" },
       { 0x103C, 0x3352, CISS_BOARD_SA5,   "HP Smart Array P421" },
       { 0x103C, 0x3353, CISS_BOARD_SA5,   "HP Smart Array P822" },
       { 0x103C, 0x3354, CISS_BOARD_SA5,   "HP Smart Array P420i" },
       { 0x103C, 0x3355, CISS_BOARD_SA5,   "HP Smart Array P220i" },
       { 0x103C, 0x3356, CISS_BOARD_SA5,   "HP Smart Array P721m" },
       { 0x103C, 0x1920, CISS_BOARD_SA5,   "HP Smart Array P430i" },
       { 0x103C, 0x1921, CISS_BOARD_SA5,   "HP Smart Array P830i" },
       { 0x103C, 0x1922, CISS_BOARD_SA5,   "HP Smart Array P430" },
       { 0x103C, 0x1923, CISS_BOARD_SA5,   "HP Smart Array P431" },
       { 0x103C, 0x1924, CISS_BOARD_SA5,   "HP Smart Array P830" },
       { 0x103C, 0x1926, CISS_BOARD_SA5,   "HP Smart Array P731m" },
       { 0x103C, 0x1928, CISS_BOARD_SA5,   "HP Smart Array P230i" },
       { 0x103C, 0x1929, CISS_BOARD_SA5,   "HP Smart Array P530" },
       { 0x103C, 0x192A, CISS_BOARD_SA5,   "HP Smart Array P531" },
       { 0x103C, 0x21BD, CISS_BOARD_SA5,   "HP Smart Array P244br" },
       { 0x103C, 0x21BE, CISS_BOARD_SA5,   "HP Smart Array P741m" },
       { 0x103C, 0x21BF, CISS_BOARD_SA5,   "HP Smart Array H240ar" },
       { 0x103C, 0x21C0, CISS_BOARD_SA5,   "HP Smart Array P440ar" },
       { 0x103C, 0x21C1, CISS_BOARD_SA5,   "HP Smart Array P840ar" },
       { 0x103C, 0x21C2, CISS_BOARD_SA5,   "HP Smart Array P440" },
       { 0x103C, 0x21C3, CISS_BOARD_SA5,   "HP Smart Array P441" },
       { 0x103C, 0x21C5, CISS_BOARD_SA5,   "HP Smart Array P841" },
       { 0x103C, 0x21C6, CISS_BOARD_SA5,   "HP Smart Array H244br" },
       { 0x103C, 0x21C7, CISS_BOARD_SA5,   "HP Smart Array H240" },
       { 0x103C, 0x21C8, CISS_BOARD_SA5,   "HP Smart Array H241" },
       { 0x103C, 0x21CA, CISS_BOARD_SA5,   "HP Smart Array P246br" },
       { 0x103C, 0x21CB, CISS_BOARD_SA5,   "HP Smart Array P840" },
       { 0x103C, 0x21CC, CISS_BOARD_SA5,   "HP Smart Array P542d" },
       { 0x103C, 0x21CD, CISS_BOARD_SA5,   "HP Smart Array P240nr" },
       { 0x103C, 0x21CE, CISS_BOARD_SA5,   "HP Smart Array H240nr" },
       { 0, 0, 0, NULL }
   };
   
   static devclass_t       ciss_devclass;
   DRIVER_MODULE(ciss, pci, ciss_pci_driver, ciss_devclass, 0, 0);
   MODULE_PNP_INFO("U16:vendor;U16:device;", pci, ciss, ciss_vendor_data,
       nitems(ciss_vendor_data) - 1);
   MODULE_DEPEND(ciss, cam, 1, 1, 1);
   MODULE_DEPEND(ciss, pci, 1, 1, 1);
   
   /************************************************************************
    * Find a match for the device in our list of known adapters.
    */
   static int
   ciss_lookup(device_t dev)
   {
       int         i;
   
       for (i = 0; ciss_vendor_data[i].desc != NULL; i++)
           if ((pci_get_subvendor(dev) == ciss_vendor_data[i].subvendor) &&
               (pci_get_subdevice(dev) == ciss_vendor_data[i].subdevice)) {
               return(i);
           }
       return(-1);
   }
   
   /************************************************************************
    * Match a known CISS adapter.
    */
   static int
   ciss_probe(device_t dev)
   {
       int         i;
   
       i = ciss_lookup(dev);
       if (i != -1) {
           device_set_desc(dev, ciss_vendor_data[i].desc);
           return(BUS_PROBE_DEFAULT);
       }
       return(ENOENT);
   }
   
   /************************************************************************
    * Attach the driver to this adapter.
    */
   static int
   ciss_attach(device_t dev)
   {
       struct ciss_softc   *sc;
       int                 error;
   
       debug_called(1);
   
   #ifdef CISS_DEBUG
       /* print structure/union sizes */
       debug_struct(ciss_command);
       debug_struct(ciss_header);
       debug_union(ciss_device_address);
       debug_struct(ciss_cdb);
       debug_struct(ciss_report_cdb);
       debug_struct(ciss_notify_cdb);
       debug_struct(ciss_notify);
       debug_struct(ciss_message_cdb);
       debug_struct(ciss_error_info_pointer);
       debug_struct(ciss_error_info);
       debug_struct(ciss_sg_entry);
       debug_struct(ciss_config_table);
       debug_struct(ciss_bmic_cdb);
       debug_struct(ciss_bmic_id_ldrive);
       debug_struct(ciss_bmic_id_lstatus);
       debug_struct(ciss_bmic_id_table);
       debug_struct(ciss_bmic_id_pdrive);
       debug_struct(ciss_bmic_blink_pdrive);
       debug_struct(ciss_bmic_flush_cache);
       debug_const(CISS_MAX_REQUESTS);
       debug_const(CISS_MAX_LOGICAL);
       debug_const(CISS_INTERRUPT_COALESCE_DELAY);
       debug_const(CISS_INTERRUPT_COALESCE_COUNT);
       debug_const(CISS_COMMAND_ALLOC_SIZE);
       debug_const(CISS_COMMAND_SG_LENGTH);
   
       debug_type(cciss_pci_info_struct);
       debug_type(cciss_coalint_struct);
       debug_type(cciss_coalint_struct);
       debug_type(NodeName_type);
       debug_type(NodeName_type);
       debug_type(Heartbeat_type);
       debug_type(BusTypes_type);
       debug_type(FirmwareVer_type);
       debug_type(DriverVer_type);
       debug_type(IOCTL_Command_struct);
   #endif
   
       sc = device_get_softc(dev);
       sc->ciss_dev = dev;
       mtx_init(&sc->ciss_mtx, "cissmtx", NULL, MTX_DEF);
       callout_init_mtx(&sc->ciss_periodic, &sc->ciss_mtx, 0);
   
       /*
        * Do PCI-specific init.
        */
       if ((error = ciss_init_pci(sc)) != 0)
           goto out;
   
       /*
        * Initialise driver queues.
        */
       ciss_initq_free(sc);
       ciss_initq_notify(sc);
   
       /*
        * Initialize device sysctls.
        */
       ciss_init_sysctl(sc);
   
       /*
        * Initialise command/request pool.
        */
       if ((error = ciss_init_requests(sc)) != 0)
           goto out;
   
       /*
        * Get adapter information.
        */
       if ((error = ciss_identify_adapter(sc)) != 0)
           goto out;
   
       /*
        * Find all the physical devices.
        */
       if ((error = ciss_init_physical(sc)) != 0)
           goto out;
   
       /*
        * Build our private table of logical devices.
        */
       if ((error = ciss_init_logical(sc)) != 0)
           goto out;
   
       /*
        * Enable interrupts so that the CAM scan can complete.
        */
       CISS_TL_SIMPLE_ENABLE_INTERRUPTS(sc);
   
       /*
        * Initialise the CAM interface.
        */
       if ((error = ciss_cam_init(sc)) != 0)
           goto out;
   
       /*
        * Start the heartbeat routine and event chain.
        */
       ciss_periodic(sc);
   
      /*
        * Create the control device.
        */
       sc->ciss_dev_t = make_dev(&ciss_cdevsw, device_get_unit(sc->ciss_dev),
                                 UID_ROOT, GID_OPERATOR, S_IRUSR | S_IWUSR,
                                 "ciss%d", device_get_unit(sc->ciss_dev));
       sc->ciss_dev_t->si_drv1 = sc;
   
       /*
        * The adapter is running; synchronous commands can now sleep
        * waiting for an interrupt to signal completion.
        */
       sc->ciss_flags |= CISS_FLAG_RUNNING;
   
       ciss_spawn_notify_thread(sc);
   
       error = 0;
    out:
       if (error != 0) {
           /* ciss_free() expects the mutex to be held */
           mtx_lock(&sc->ciss_mtx);
           ciss_free(sc);
       }
       return(error);
   }
   
   /************************************************************************
    * Detach the driver from this adapter.
    */
   static int
   ciss_detach(device_t dev)
   {
       struct ciss_softc   *sc = device_get_softc(dev);
   
       debug_called(1);
   
       mtx_lock(&sc->ciss_mtx);
       if (sc->ciss_flags & CISS_FLAG_CONTROL_OPEN) {
           mtx_unlock(&sc->ciss_mtx);
           return (EBUSY);
       }
   
       /* flush adapter cache */
       ciss_flush_adapter(sc);
   
       /* release all resources.  The mutex is released and freed here too. */
       ciss_free(sc);
   
       return(0);
   }
   
   /************************************************************************
    * Prepare adapter for system shutdown.
    */
   static int
   ciss_shutdown(device_t dev)
   {
       struct ciss_softc   *sc = device_get_softc(dev);
   
       debug_called(1);
   
       mtx_lock(&sc->ciss_mtx);
       /* flush adapter cache */
       ciss_flush_adapter(sc);
   
       if (sc->ciss_soft_reset)
           ciss_soft_reset(sc);
       mtx_unlock(&sc->ciss_mtx);
   
       return(0);
   }
   
   static void
   ciss_init_sysctl(struct ciss_softc *sc)
   {
   
       SYSCTL_ADD_INT(device_get_sysctl_ctx(sc->ciss_dev),
           SYSCTL_CHILDREN(device_get_sysctl_tree(sc->ciss_dev)),
           OID_AUTO, "soft_reset", CTLFLAG_RW, &sc->ciss_soft_reset, 0, "");
   }
   
   /************************************************************************
    * Perform PCI-specific attachment actions.
    */
   static int
   ciss_init_pci(struct ciss_softc *sc)
   {
       uintptr_t           cbase, csize, cofs;
       uint32_t            method, supported_methods;
       int                 error, sqmask, i;
       void                *intr;
   
       debug_called(1);
   
       /*
        * Work out adapter type.
        */
       i = ciss_lookup(sc->ciss_dev);
       if (i < 0) {
           ciss_printf(sc, "unknown adapter type\n");
           return (ENXIO);
       }
   
       if (ciss_vendor_data[i].flags & CISS_BOARD_SA5) {
           sqmask = CISS_TL_SIMPLE_INTR_OPQ_SA5;
       } else if (ciss_vendor_data[i].flags & CISS_BOARD_SA5B) {
           sqmask = CISS_TL_SIMPLE_INTR_OPQ_SA5B;
       } else {
           /*
            * XXX Big hammer, masks/unmasks all possible interrupts.  This should
            * work on all hardware variants.  Need to add code to handle the
            * "controller crashed" interrupt bit that this unmasks.
            */
           sqmask = ~0;
       }
   
       /*
        * Allocate register window first (we need this to find the config
        * struct).
        */
       error = ENXIO;
       sc->ciss_regs_rid = CISS_TL_SIMPLE_BAR_REGS;
       if ((sc->ciss_regs_resource =
            bus_alloc_resource_any(sc->ciss_dev, SYS_RES_MEMORY,
                                   &sc->ciss_regs_rid, RF_ACTIVE)) == NULL) {
           ciss_printf(sc, "can't allocate register window\n");
           return(ENXIO);
       }
       sc->ciss_regs_bhandle = rman_get_bushandle(sc->ciss_regs_resource);
       sc->ciss_regs_btag = rman_get_bustag(sc->ciss_regs_resource);
   
       /*
        * Find the BAR holding the config structure.  If it's not the one
        * we already mapped for registers, map it too.
        */
       sc->ciss_cfg_rid = CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_CFG_BAR) & 0xffff;
       if (sc->ciss_cfg_rid != sc->ciss_regs_rid) {
           if ((sc->ciss_cfg_resource =
                bus_alloc_resource_any(sc->ciss_dev, SYS_RES_MEMORY,
                                       &sc->ciss_cfg_rid, RF_ACTIVE)) == NULL) {
               ciss_printf(sc, "can't allocate config window\n");
               return(ENXIO);
           }
           cbase = (uintptr_t)rman_get_virtual(sc->ciss_cfg_resource);
           csize = rman_get_end(sc->ciss_cfg_resource) -
               rman_get_start(sc->ciss_cfg_resource) + 1;
       } else {
           cbase = (uintptr_t)rman_get_virtual(sc->ciss_regs_resource);
           csize = rman_get_end(sc->ciss_regs_resource) -
               rman_get_start(sc->ciss_regs_resource) + 1;
       }
       cofs = CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_CFG_OFF);
   
       /*
        * Use the base/size/offset values we just calculated to
        * sanity-check the config structure.  If it's OK, point to it.
        */
       if ((cofs + sizeof(struct ciss_config_table)) > csize) {
           ciss_printf(sc, "config table outside window\n");
           return(ENXIO);
       }
       sc->ciss_cfg = (struct ciss_config_table *)(cbase + cofs);
       debug(1, "config struct at %p", sc->ciss_cfg);
   
       /*
        * Calculate the number of request structures/commands we are
        * going to provide for this adapter.
        */
       sc->ciss_max_requests = min(CISS_MAX_REQUESTS, sc->ciss_cfg->max_outstanding_commands);
   
       /*
        * Validate the config structure.  If we supported other transport
        * methods, we could select amongst them at this point in time.
        */
       if (strncmp(sc->ciss_cfg->signature, "CISS", 4)) {
           ciss_printf(sc, "config signature mismatch (got '%c%c%c%c')\n",
                       sc->ciss_cfg->signature[0], sc->ciss_cfg->signature[1],
                       sc->ciss_cfg->signature[2], sc->ciss_cfg->signature[3]);
           return(ENXIO);
       }
   
       /*
        * Select the mode of operation, prefer Performant.
        */
       if (!(sc->ciss_cfg->supported_methods &
           (CISS_TRANSPORT_METHOD_SIMPLE | CISS_TRANSPORT_METHOD_PERF))) {
           ciss_printf(sc, "No supported transport layers: 0x%x\n",
               sc->ciss_cfg->supported_methods);
       }
   
       switch (ciss_force_transport) {
       case 1:
           supported_methods = CISS_TRANSPORT_METHOD_SIMPLE;
           break;
       case 2:
           supported_methods = CISS_TRANSPORT_METHOD_PERF;
           break;
       default:
           /*
            * Override the capabilities of the BOARD and specify SIMPLE
            * MODE 
            */
           if (ciss_vendor_data[i].flags & CISS_BOARD_SIMPLE)
                   supported_methods = CISS_TRANSPORT_METHOD_SIMPLE;
           else
                   supported_methods = sc->ciss_cfg->supported_methods;
           break;
       }
   
   setup:
       if ((supported_methods & CISS_TRANSPORT_METHOD_PERF) != 0) {
           method = CISS_TRANSPORT_METHOD_PERF;
           sc->ciss_perf = (struct ciss_perf_config *)(cbase + cofs +
               sc->ciss_cfg->transport_offset);
           if (ciss_init_perf(sc)) {
               supported_methods &= ~method;
               goto setup;
           }
       } else if (supported_methods & CISS_TRANSPORT_METHOD_SIMPLE) {
           method = CISS_TRANSPORT_METHOD_SIMPLE;
       } else {
           ciss_printf(sc, "No supported transport methods: 0x%x\n",
               sc->ciss_cfg->supported_methods);
           return(ENXIO);
       }
   
       /*
        * Tell it we're using the low 4GB of RAM.  Set the default interrupt
        * coalescing options.
        */
       sc->ciss_cfg->requested_method = method;
       sc->ciss_cfg->command_physlimit = 0;
       sc->ciss_cfg->interrupt_coalesce_delay = CISS_INTERRUPT_COALESCE_DELAY;
       sc->ciss_cfg->interrupt_coalesce_count = CISS_INTERRUPT_COALESCE_COUNT;
   
   #ifdef __i386__
       sc->ciss_cfg->host_driver |= CISS_DRIVER_SCSI_PREFETCH;
   #endif
   
       if (ciss_update_config(sc)) {
           ciss_printf(sc, "adapter refuses to accept config update (IDBR 0x%x)\n",
                       CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_IDBR));
           return(ENXIO);
       }
       if ((sc->ciss_cfg->active_method & method) == 0) {
           supported_methods &= ~method;
           if (supported_methods == 0) {
               ciss_printf(sc, "adapter refuses to go into available transports "
                   "mode (0x%x, 0x%x)\n", supported_methods,
                   sc->ciss_cfg->active_method);
               return(ENXIO);
           } else 
               goto setup;
       }
   
       /*
        * Wait for the adapter to come ready.
        */
       if ((error = ciss_wait_adapter(sc)) != 0)
           return(error);
   
       /* Prepare to possibly use MSIX and/or PERFORMANT interrupts.  Normal
        * interrupts have a rid of 0, this will be overridden if MSIX is used.
        */
       sc->ciss_irq_rid[0] = 0;
       if (method == CISS_TRANSPORT_METHOD_PERF) {
           ciss_printf(sc, "PERFORMANT Transport\n");
           if ((ciss_force_interrupt != 1) && (ciss_setup_msix(sc) == 0)) {
               intr = ciss_perf_msi_intr;
           } else {
               intr = ciss_perf_intr;
           }
           /* XXX The docs say that the 0x01 bit is only for SAS controllers.
            * Unfortunately, there is no good way to know if this is a SAS
            * controller.  Hopefully enabling this bit universally will work OK.
            * It seems to work fine for SA6i controllers.
            */
           sc->ciss_interrupt_mask = CISS_TL_PERF_INTR_OPQ | CISS_TL_PERF_INTR_MSI;
   
       } else {
           ciss_printf(sc, "SIMPLE Transport\n");
           /* MSIX doesn't seem to work in SIMPLE mode, only enable if it forced */
           if (ciss_force_interrupt == 2)
               /* If this fails, we automatically revert to INTx */
               ciss_setup_msix(sc);
           sc->ciss_perf = NULL;
           intr = ciss_intr;
           sc->ciss_interrupt_mask = sqmask;
       }
   
       /*
        * Turn off interrupts before we go routing anything.
        */
       CISS_TL_SIMPLE_DISABLE_INTERRUPTS(sc);
   
       /*
        * Allocate and set up our interrupt.
        */
       if ((sc->ciss_irq_resource =
            bus_alloc_resource_any(sc->ciss_dev, SYS_RES_IRQ, &sc->ciss_irq_rid[0],
                                   RF_ACTIVE | RF_SHAREABLE)) == NULL) {
           ciss_printf(sc, "can't allocate interrupt\n");
           return(ENXIO);
       }
   
       if (bus_setup_intr(sc->ciss_dev, sc->ciss_irq_resource,
                          INTR_TYPE_CAM|INTR_MPSAFE, NULL, intr, sc,
                          &sc->ciss_intr)) {
           ciss_printf(sc, "can't set up interrupt\n");
           return(ENXIO);
       }
   
       /*
        * Allocate the parent bus DMA tag appropriate for our PCI
        * interface.
        *
        * Note that "simple" adapters can only address within a 32-bit
        * span.
        */
       if (bus_dma_tag_create(bus_get_dma_tag(sc->ciss_dev),/* PCI parent */
                              1, 0,                        /* alignment, boundary */
                              BUS_SPACE_MAXADDR,           /* lowaddr */
                              BUS_SPACE_MAXADDR,           /* highaddr */
                              NULL, NULL,                  /* filter, filterarg */
                              BUS_SPACE_MAXSIZE_32BIT,     /* maxsize */
                              BUS_SPACE_UNRESTRICTED,      /* nsegments */
                              BUS_SPACE_MAXSIZE_32BIT,     /* maxsegsize */
                              0,                           /* flags */
                              NULL, NULL,                  /* lockfunc, lockarg */
                              &sc->ciss_parent_dmat)) {
           ciss_printf(sc, "can't allocate parent DMA tag\n");
           return(ENOMEM);
       }
   
       /*
        * Create DMA tag for mapping buffers into adapter-addressable
        * space.
        */
       if (bus_dma_tag_create(sc->ciss_parent_dmat,        /* parent */
                              1, 0,                        /* alignment, boundary */
                              BUS_SPACE_MAXADDR,           /* lowaddr */
                              BUS_SPACE_MAXADDR,           /* highaddr */
                              NULL, NULL,                  /* filter, filterarg */
                              (CISS_MAX_SG_ELEMENTS - 1) * PAGE_SIZE, /* maxsize */
                              CISS_MAX_SG_ELEMENTS,        /* nsegments */
                              BUS_SPACE_MAXSIZE_32BIT,     /* maxsegsize */
                              BUS_DMA_ALLOCNOW,            /* flags */
                              busdma_lock_mutex, &sc->ciss_mtx,    /* lockfunc, lockarg */
                              &sc->ciss_buffer_dmat)) {
           ciss_printf(sc, "can't allocate buffer DMA tag\n");
           return(ENOMEM);
       }
       return(0);
   }
   
   /************************************************************************
    * Setup MSI/MSIX operation (Performant only)
    * Four interrupts are available, but we only use 1 right now.  If MSI-X
    * isn't avaialble, try using MSI instead.
    */
   static int
   ciss_setup_msix(struct ciss_softc *sc)
   {
       int val, i;
   
       /* Weed out devices that don't actually support MSI */
       i = ciss_lookup(sc->ciss_dev);
       if (ciss_vendor_data[i].flags & CISS_BOARD_NOMSI)
           return (EINVAL);
   
       /*
        * Only need to use the minimum number of MSI vectors, as the driver
        * doesn't support directed MSIX interrupts.
        */
       val = pci_msix_count(sc->ciss_dev);
       if (val < CISS_MSI_COUNT) {
           val = pci_msi_count(sc->ciss_dev);
           device_printf(sc->ciss_dev, "got %d MSI messages]\n", val);
           if (val < CISS_MSI_COUNT)
               return (EINVAL);
       }
       val = MIN(val, CISS_MSI_COUNT);
       if (pci_alloc_msix(sc->ciss_dev, &val) != 0) {
           if (pci_alloc_msi(sc->ciss_dev, &val) != 0)
               return (EINVAL);
       }
   
       sc->ciss_msi = val;
       if (bootverbose)
           ciss_printf(sc, "Using %d MSIX interrupt%s\n", val,
               (val != 1) ? "s" : "");
   
       for (i = 0; i < val; i++)
           sc->ciss_irq_rid[i] = i + 1;
   
       return (0);
   
   }
   
   /************************************************************************
    * Setup the Performant structures.
    */
   static int
   ciss_init_perf(struct ciss_softc *sc)
   {
       struct ciss_perf_config *pc = sc->ciss_perf;
       int reply_size;
   
       /*
        * Create the DMA tag for the reply queue.
        */
       reply_size = sizeof(uint64_t) * sc->ciss_max_requests;
       if (bus_dma_tag_create(sc->ciss_parent_dmat,        /* parent */
                              1, 0,                        /* alignment, boundary */
                              BUS_SPACE_MAXADDR_32BIT,     /* lowaddr */
                              BUS_SPACE_MAXADDR,           /* highaddr */
                              NULL, NULL,                  /* filter, filterarg */
                              reply_size, 1,               /* maxsize, nsegments */
                              BUS_SPACE_MAXSIZE_32BIT,     /* maxsegsize */
                              0,                           /* flags */
                              NULL, NULL,                  /* lockfunc, lockarg */
                              &sc->ciss_reply_dmat)) {
           ciss_printf(sc, "can't allocate reply DMA tag\n");
           return(ENOMEM);
       }
       /*
        * Allocate memory and make it available for DMA.
        */
       if (bus_dmamem_alloc(sc->ciss_reply_dmat, (void **)&sc->ciss_reply,
                            BUS_DMA_NOWAIT, &sc->ciss_reply_map)) {
           ciss_printf(sc, "can't allocate reply memory\n");
           return(ENOMEM);
       }
       bus_dmamap_load(sc->ciss_reply_dmat, sc->ciss_reply_map, sc->ciss_reply,
                       reply_size, ciss_command_map_helper, &sc->ciss_reply_phys, 0);
       bzero(sc->ciss_reply, reply_size);
   
       sc->ciss_cycle = 0x1;
       sc->ciss_rqidx = 0;
   
       /*
        * Preload the fetch table with common command sizes.  This allows the
        * hardware to not waste bus cycles for typical i/o commands, but also not
        * tax the driver to be too exact in choosing sizes.  The table is optimized
        * for page-aligned i/o's, but since most i/o comes from the various pagers,
        * it's a reasonable assumption to make.
        */
       pc->fetch_count[CISS_SG_FETCH_NONE] = (sizeof(struct ciss_command) + 15) / 16;
       pc->fetch_count[CISS_SG_FETCH_1] =
           (sizeof(struct ciss_command) + sizeof(struct ciss_sg_entry) * 1 + 15) / 16;
       pc->fetch_count[CISS_SG_FETCH_2] =
           (sizeof(struct ciss_command) + sizeof(struct ciss_sg_entry) * 2 + 15) / 16;
       pc->fetch_count[CISS_SG_FETCH_4] =
           (sizeof(struct ciss_command) + sizeof(struct ciss_sg_entry) * 4 + 15) / 16;
       pc->fetch_count[CISS_SG_FETCH_8] =
           (sizeof(struct ciss_command) + sizeof(struct ciss_sg_entry) * 8 + 15) / 16;
       pc->fetch_count[CISS_SG_FETCH_16] =
           (sizeof(struct ciss_command) + sizeof(struct ciss_sg_entry) * 16 + 15) / 16;
       pc->fetch_count[CISS_SG_FETCH_32] =
           (sizeof(struct ciss_command) + sizeof(struct ciss_sg_entry) * 32 + 15) / 16;
       pc->fetch_count[CISS_SG_FETCH_MAX] = (CISS_COMMAND_ALLOC_SIZE + 15) / 16;
   
       pc->rq_size = sc->ciss_max_requests; /* XXX less than the card supports? */
       pc->rq_count = 1;   /* XXX Hardcode for a single queue */
       pc->rq_bank_hi = 0;
       pc->rq_bank_lo = 0;
       pc->rq[0].rq_addr_hi = 0x0;
       pc->rq[0].rq_addr_lo = sc->ciss_reply_phys;
   
       return(0);
   }
   
   /************************************************************************
    * Wait for the adapter to come ready.
    */
   static int
   ciss_wait_adapter(struct ciss_softc *sc)
  {
      int         i;
  
      debug_called(1);
  
      /*
       * Wait for the adapter to come ready.
       */
      if (!(sc->ciss_cfg->active_method & CISS_TRANSPORT_METHOD_READY)) {
          ciss_printf(sc, "waiting for adapter to come ready...\n");
          for (i = 0; !(sc->ciss_cfg->active_method & CISS_TRANSPORT_METHOD_READY); i++) {
              DELAY(1000000);     /* one second */
              if (i > 30) {
                  ciss_printf(sc, "timed out waiting for adapter to come ready\n");
                  return(EIO);
              }
          }
      }
      return(0);
  }
  
  /************************************************************************
   * Flush the adapter cache.
   */
  static int
  ciss_flush_adapter(struct ciss_softc *sc)
  {
      struct ciss_request                 *cr;
      struct ciss_bmic_flush_cache        *cbfc;
      int                                 error, command_status;
  
      debug_called(1);
  
      cr = NULL;
      cbfc = NULL;
  
      /*
       * Build a BMIC request to flush the cache.  We don't disable
       * it, as we may be going to do more I/O (eg. we are emulating
       * the Synchronise Cache command).
       */
      if ((cbfc = malloc(sizeof(*cbfc), CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO)) == NULL) {
          error = ENOMEM;
          goto out;
      }
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_FLUSH_CACHE,
                                         (void **)&cbfc, sizeof(*cbfc))) != 0)
          goto out;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error sending BMIC FLUSH_CACHE command (%d)\n", error);
          goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
          break;
      default:
          ciss_printf(sc, "error flushing cache (%s)\n",
                      ciss_name_command_status(command_status));
          error = EIO;
          goto out;
      }
  
  out:
      if (cbfc != NULL)
          free(cbfc, CISS_MALLOC_CLASS);
      if (cr != NULL)
          ciss_release_request(cr);
      return(error);
  }
  
  static void
  ciss_soft_reset(struct ciss_softc *sc)
  {
      struct ciss_request         *cr = NULL;
      struct ciss_command         *cc;
      int                         i, error = 0;
  
      for (i = 0; i < sc->ciss_max_logical_bus; i++) {
          /* only reset proxy controllers */
          if (sc->ciss_controllers[i].physical.bus == 0)
              continue;
  
          if ((error = ciss_get_request(sc, &cr)) != 0)
              break;
  
          if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_SOFT_RESET,
                                             NULL, 0)) != 0)
              break;
  
          cc = cr->cr_cc;
          cc->header.address = sc->ciss_controllers[i];
  
          if ((error = ciss_synch_request(cr, 60 * 1000)) != 0)
              break;
  
          ciss_release_request(cr);
      }
  
      if (error)
          ciss_printf(sc, "error resetting controller (%d)\n", error);
  
      if (cr != NULL)
          ciss_release_request(cr);
  }
  
  /************************************************************************
   * Allocate memory for the adapter command structures, initialise
   * the request structures.
   *
   * Note that the entire set of commands are allocated in a single
   * contiguous slab.
   */
  static int
  ciss_init_requests(struct ciss_softc *sc)
  {
      struct ciss_request *cr;
      int                 i;
  
      debug_called(1);
  
      if (bootverbose)
          ciss_printf(sc, "using %d of %d available commands\n",
                      sc->ciss_max_requests, sc->ciss_cfg->max_outstanding_commands);
  
      /*
       * Create the DMA tag for commands.
       */
      if (bus_dma_tag_create(sc->ciss_parent_dmat,        /* parent */
                             32, 0,                       /* alignment, boundary */
                             BUS_SPACE_MAXADDR_32BIT,     /* lowaddr */
                             BUS_SPACE_MAXADDR,           /* highaddr */
                             NULL, NULL,                  /* filter, filterarg */
                             CISS_COMMAND_ALLOC_SIZE *
                             sc->ciss_max_requests, 1,    /* maxsize, nsegments */
                             BUS_SPACE_MAXSIZE_32BIT,     /* maxsegsize */
                             0,                           /* flags */
                             NULL, NULL,                  /* lockfunc, lockarg */
                             &sc->ciss_command_dmat)) {
          ciss_printf(sc, "can't allocate command DMA tag\n");
          return(ENOMEM);
      }
      /*
       * Allocate memory and make it available for DMA.
       */
      if (bus_dmamem_alloc(sc->ciss_command_dmat, (void **)&sc->ciss_command,
                           BUS_DMA_NOWAIT, &sc->ciss_command_map)) {
          ciss_printf(sc, "can't allocate command memory\n");
          return(ENOMEM);
      }
      bus_dmamap_load(sc->ciss_command_dmat, sc->ciss_command_map,sc->ciss_command,
                      CISS_COMMAND_ALLOC_SIZE * sc->ciss_max_requests,
                      ciss_command_map_helper, &sc->ciss_command_phys, 0);
      bzero(sc->ciss_command, CISS_COMMAND_ALLOC_SIZE * sc->ciss_max_requests);
  
      /*
       * Set up the request and command structures, push requests onto
       * the free queue.
       */
      for (i = 1; i < sc->ciss_max_requests; i++) {
          cr = &sc->ciss_request[i];
          cr->cr_sc = sc;
          cr->cr_tag = i;
          cr->cr_cc = (struct ciss_command *)((uintptr_t)sc->ciss_command +
              CISS_COMMAND_ALLOC_SIZE * i);
          cr->cr_ccphys = sc->ciss_command_phys + CISS_COMMAND_ALLOC_SIZE * i;
          bus_dmamap_create(sc->ciss_buffer_dmat, 0, &cr->cr_datamap);
          ciss_enqueue_free(cr);
      }
      return(0);
  }
  
  static void
  ciss_command_map_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  {
      uint32_t *addr;
  
      addr = arg;
      *addr = segs[0].ds_addr;
  }
  
  /************************************************************************
   * Identify the adapter, print some information about it.
   */
  static int
  ciss_identify_adapter(struct ciss_softc *sc)
  {
      struct ciss_request *cr;
      int                 error, command_status;
  
      debug_called(1);
  
      cr = NULL;
  
      /*
       * Get a request, allocate storage for the adapter data.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ID_CTLR,
                                         (void **)&sc->ciss_id,
                                         sizeof(*sc->ciss_id))) != 0)
          goto out;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error sending BMIC ID_CTLR command (%d)\n", error);
          goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:               /* buffer right size */
          break;
      case CISS_CMD_STATUS_DATA_UNDERRUN:
      case CISS_CMD_STATUS_DATA_OVERRUN:
          ciss_printf(sc, "data over/underrun reading adapter information\n");
      default:
          ciss_printf(sc, "error reading adapter information (%s)\n",
                      ciss_name_command_status(command_status));
          error = EIO;
          goto out;
      }
  
      /* sanity-check reply */
      if (!(sc->ciss_id->controller_flags & CONTROLLER_FLAGS_BIG_MAP_SUPPORT)) {
          ciss_printf(sc, "adapter does not support BIG_MAP\n");
          error = ENXIO;
          goto out;
      }
  
  #if 0
      /* XXX later revisions may not need this */
      sc->ciss_flags |= CISS_FLAG_FAKE_SYNCH;
  #endif
  
      /* XXX only really required for old 5300 adapters? */
      sc->ciss_flags |= CISS_FLAG_BMIC_ABORT;
  
      /*
       * Earlier controller specs do not contain these config
       * entries, so assume that a 0 means its old and assign
       * these values to the defaults that were established 
       * when this driver was developed for them
       */
      if (sc->ciss_cfg->max_logical_supported == 0) 
          sc->ciss_cfg->max_logical_supported = CISS_MAX_LOGICAL;
      if (sc->ciss_cfg->max_physical_supported == 0) 
          sc->ciss_cfg->max_physical_supported = CISS_MAX_PHYSICAL;
      /* print information */
      if (bootverbose) {
          ciss_printf(sc, "  %d logical drive%s configured\n",
                      sc->ciss_id->configured_logical_drives,
                      (sc->ciss_id->configured_logical_drives == 1) ? "" : "s");
          ciss_printf(sc, "  firmware %4.4s\n", sc->ciss_id->running_firmware_revision);
          ciss_printf(sc, "  %d SCSI channels\n", sc->ciss_id->scsi_chip_count);
  
          ciss_printf(sc, "  signature '%.4s'\n", sc->ciss_cfg->signature);
          ciss_printf(sc, "  valence %d\n", sc->ciss_cfg->valence);
          ciss_printf(sc, "  supported I/O methods 0x%b\n",
                      sc->ciss_cfg->supported_methods,
                      "\2\1READY\2simple\3performant\4MEMQ\n");
          ciss_printf(sc, "  active I/O method 0x%b\n",
                      sc->ciss_cfg->active_method, "\2\2simple\3performant\4MEMQ\n");
          ciss_printf(sc, "  4G page base 0x%08x\n",
                      sc->ciss_cfg->command_physlimit);
          ciss_printf(sc, "  interrupt coalesce delay %dus\n",
                      sc->ciss_cfg->interrupt_coalesce_delay);
          ciss_printf(sc, "  interrupt coalesce count %d\n",
                      sc->ciss_cfg->interrupt_coalesce_count);
          ciss_printf(sc, "  max outstanding commands %d\n",
                      sc->ciss_cfg->max_outstanding_commands);
          ciss_printf(sc, "  bus types 0x%b\n", sc->ciss_cfg->bus_types,
                      "\2\1ultra2\2ultra3\10fibre1\11fibre2\n");
          ciss_printf(sc, "  server name '%.16s'\n", sc->ciss_cfg->server_name);
          ciss_printf(sc, "  heartbeat 0x%x\n", sc->ciss_cfg->heartbeat);
          ciss_printf(sc, "  max logical volumes: %d\n", sc->ciss_cfg->max_logical_supported);
          ciss_printf(sc, "  max physical disks supported: %d\n", sc->ciss_cfg->max_physical_supported);
          ciss_printf(sc, "  max physical disks per logical volume: %d\n", sc->ciss_cfg->max_physical_per_logical);
          ciss_printf(sc, "  JBOD Support is %s\n", (sc->ciss_id->uiYetMoreControllerFlags & YMORE_CONTROLLER_FLAGS_JBOD_SUPPORTED) ?
                          "Available" : "Unavailable");
          ciss_printf(sc, "  JBOD Mode is %s\n", (sc->ciss_id->PowerUPNvramFlags & PWR_UP_FLAG_JBOD_ENABLED) ?
                          "Enabled" : "Disabled");
      }
  
  out:
      if (error) {
          if (sc->ciss_id != NULL) {
              free(sc->ciss_id, CISS_MALLOC_CLASS);
              sc->ciss_id = NULL;
          }
      }
      if (cr != NULL)
          ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Helper routine for generating a list of logical and physical luns.
   */
  static struct ciss_lun_report *
  ciss_report_luns(struct ciss_softc *sc, int opcode, int nunits)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_report_cdb      *crc;
      struct ciss_lun_report      *cll;
      int                         command_status;
      int                         report_size;
      int                         error = 0;
  
      debug_called(1);
  
      cr = NULL;
      cll = NULL;
  
      /*
       * Get a request, allocate storage for the address list.
       */
      if ((error = ciss_get_request(sc, &cr)) != 0)
          goto out;
      report_size = sizeof(*cll) + nunits * sizeof(union ciss_device_address);
      if ((cll = malloc(report_size, CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO)) == NULL) {
          ciss_printf(sc, "can't allocate memory for lun report\n");
          error = ENOMEM;
          goto out;
      }
  
      /*
       * Build the Report Logical/Physical LUNs command.
       */
      cc = cr->cr_cc;
      cr->cr_data = cll;
      cr->cr_length = report_size;
      cr->cr_flags = CISS_REQ_DATAIN;
  
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
      cc->cdb.cdb_length = sizeof(*crc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 30;       /* XXX better suggestions? */
  
      crc = (struct ciss_report_cdb *)&(cc->cdb.cdb[0]);
      bzero(crc, sizeof(*crc));
      crc->opcode = opcode;
      crc->length = htonl(report_size);                   /* big-endian field */
      cll->list_size = htonl(report_size - sizeof(*cll)); /* big-endian field */
  
      /*
       * Submit the request and wait for it to complete.  (timeout
       * here should be much greater than above)
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error sending %d LUN command (%d)\n", opcode, error);
          goto out;
      }
  
      /*
       * Check response.  Note that data over/underrun is OK.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:       /* buffer right size */
      case CISS_CMD_STATUS_DATA_UNDERRUN: /* buffer too large, not bad */
          break;
      case CISS_CMD_STATUS_DATA_OVERRUN:
          ciss_printf(sc, "WARNING: more units than driver limit (%d)\n",
                      sc->ciss_cfg->max_logical_supported);
          break;
      default:
          ciss_printf(sc, "error detecting logical drive configuration (%s)\n",
                      ciss_name_command_status(command_status));
          error = EIO;
          goto out;
      }
      ciss_release_request(cr);
      cr = NULL;
  
  out:
      if (cr != NULL)
          ciss_release_request(cr);
      if (error && cll != NULL) {
          free(cll, CISS_MALLOC_CLASS);
          cll = NULL;
      }
      return(cll);
  }
  
  /************************************************************************
   * Find logical drives on the adapter.
   */
  static int
  ciss_init_logical(struct ciss_softc *sc)
  {
      struct ciss_lun_report      *cll;
      int                         error = 0, i, j;
      int                         ndrives;
  
      debug_called(1);
  
      cll = ciss_report_luns(sc, CISS_OPCODE_REPORT_LOGICAL_LUNS,
                             sc->ciss_cfg->max_logical_supported);
      if (cll == NULL) {
          error = ENXIO;
          goto out;
      }
  
      /* sanity-check reply */
      ndrives = (ntohl(cll->list_size) / sizeof(union ciss_device_address));
      if ((ndrives < 0) || (ndrives > sc->ciss_cfg->max_logical_supported)) {
          ciss_printf(sc, "adapter claims to report absurd number of logical drives (%d > %d)\n",
                  ndrives, sc->ciss_cfg->max_logical_supported);
          error = ENXIO;
          goto out;
      }
  
      /*
       * Save logical drive information.
       */
      if (bootverbose) {
          ciss_printf(sc, "%d logical drive%s\n",
              ndrives, (ndrives > 1 || ndrives == 0) ? "s" : "");
      }
  
      sc->ciss_logical =
          malloc(sc->ciss_max_logical_bus * sizeof(struct ciss_ldrive *),
                 CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO);
      if (sc->ciss_logical == NULL) {
          error = ENXIO;
          goto out;
      }
  
      for (i = 0; i < sc->ciss_max_logical_bus; i++) {
          sc->ciss_logical[i] =
              malloc(sc->ciss_cfg->max_logical_supported *
                     sizeof(struct ciss_ldrive),
                     CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO);
          if (sc->ciss_logical[i] == NULL) {
              error = ENXIO;
              goto out;
          }
  
          for (j = 0; j < sc->ciss_cfg->max_logical_supported; j++)
              sc->ciss_logical[i][j].cl_status = CISS_LD_NONEXISTENT;
      }
  
  
      for (i = 0; i < sc->ciss_cfg->max_logical_supported; i++) {
          if (i < ndrives) {
              struct ciss_ldrive  *ld;
              int                 bus, target;
  
              bus         = CISS_LUN_TO_BUS(cll->lun[i].logical.lun);
              target      = CISS_LUN_TO_TARGET(cll->lun[i].logical.lun);
              ld          = &sc->ciss_logical[bus][target];
  
              ld->cl_address      = cll->lun[i];
              ld->cl_controller   = &sc->ciss_controllers[bus];
              if (ciss_identify_logical(sc, ld) != 0)
                  continue;
              /*
               * If the drive has had media exchanged, we should bring it online.
               */
              if (ld->cl_lstatus->media_exchanged)
                  ciss_accept_media(sc, ld);
  
          }
      }
  
   out:
      if (cll != NULL)
          free(cll, CISS_MALLOC_CLASS);
      return(error);
  }
  
  static int
  ciss_init_physical(struct ciss_softc *sc)
  {
      struct ciss_lun_report      *cll;
      int                         error = 0, i;
      int                         nphys;
      int                         bus, target;
  
      debug_called(1);
  
      bus = 0;
      target = 0;
  
      cll = ciss_report_luns(sc, CISS_OPCODE_REPORT_PHYSICAL_LUNS,
                             sc->ciss_cfg->max_physical_supported);
      if (cll == NULL) {
          error = ENXIO;
          goto out;
      }
  
      nphys = (ntohl(cll->list_size) / sizeof(union ciss_device_address));
  
      if (bootverbose) {
          ciss_printf(sc, "%d physical device%s\n",
              nphys, (nphys > 1 || nphys == 0) ? "s" : "");
      }
  
      /*
       * Figure out the bus mapping.
       * Logical buses include both the local logical bus for local arrays and
       * proxy buses for remote arrays.  Physical buses are numbered by the
       * controller and represent physical buses that hold physical devices.
       * We shift these bus numbers so that everything fits into a single flat
       * numbering space for CAM.  Logical buses occupy the first 32 CAM bus
       * numbers, and the physical bus numbers are shifted to be above that.
       * This results in the various driver arrays being indexed as follows:
       *
       * ciss_controllers[] - indexed by logical bus
       * ciss_cam_sim[]     - indexed by both logical and physical, with physical
       *                      being shifted by 32.
       * ciss_logical[][]   - indexed by logical bus
       * ciss_physical[][]  - indexed by physical bus
       *
       * XXX This is getting more and more hackish.  CISS really doesn't play
       *     well with a standard SCSI model; devices are addressed via magic
       *     cookies, not via b/t/l addresses.  Since there is no way to store
       *     the cookie in the CAM device object, we have to keep these lookup
       *     tables handy so that the devices can be found quickly at the cost
       *     of wasting memory and having a convoluted lookup scheme.  This
       *     driver should probably be converted to block interface.
       */
      /*
       * If the L2 and L3 SCSI addresses are 0, this signifies a proxy
       * controller. A proxy controller is another physical controller
       * behind the primary PCI controller. We need to know about this
       * so that BMIC commands can be properly targeted.  There can be
       * proxy controllers attached to a single PCI controller, so
       * find the highest numbered one so the array can be properly
       * sized.
       */
      sc->ciss_max_logical_bus = 1;
      for (i = 0; i < nphys; i++) {
          if (cll->lun[i].physical.extra_address == 0) {
              bus = cll->lun[i].physical.bus;
              sc->ciss_max_logical_bus = max(sc->ciss_max_logical_bus, bus) + 1;
          } else {
              bus = CISS_EXTRA_BUS2(cll->lun[i].physical.extra_address);
              sc->ciss_max_physical_bus = max(sc->ciss_max_physical_bus, bus);
          }
      }
  
      sc->ciss_controllers =
          malloc(sc->ciss_max_logical_bus * sizeof (union ciss_device_address),
                 CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO);
  
      if (sc->ciss_controllers == NULL) {
          ciss_printf(sc, "Could not allocate memory for controller map\n");
          error = ENOMEM;
          goto out;
      }
  
      /* setup a map of controller addresses */
      for (i = 0; i < nphys; i++) {
          if (cll->lun[i].physical.extra_address == 0) {
              sc->ciss_controllers[cll->lun[i].physical.bus] = cll->lun[i];
          }
      }
  
      sc->ciss_physical =
          malloc(sc->ciss_max_physical_bus * sizeof(struct ciss_pdrive *),
                 CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO);
      if (sc->ciss_physical == NULL) {
          ciss_printf(sc, "Could not allocate memory for physical device map\n");
          error = ENOMEM;
          goto out;
      }
  
      for (i = 0; i < sc->ciss_max_physical_bus; i++) {
          sc->ciss_physical[i] =
              malloc(sizeof(struct ciss_pdrive) * CISS_MAX_PHYSTGT,
                     CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO);
          if (sc->ciss_physical[i] == NULL) {
              ciss_printf(sc, "Could not allocate memory for target map\n");
              error = ENOMEM;
              goto out;
          }
      }
  
      ciss_filter_physical(sc, cll);
  
  out:
      if (cll != NULL)
          free(cll, CISS_MALLOC_CLASS);
  
      return(error);
  }
  
  static int
  ciss_filter_physical(struct ciss_softc *sc, struct ciss_lun_report *cll)
  {
      u_int32_t ea;
      int i, nphys;
      int bus, target;
  
      nphys = (ntohl(cll->list_size) / sizeof(union ciss_device_address));
      for (i = 0; i < nphys; i++) {
          if (cll->lun[i].physical.extra_address == 0)
              continue;
  
          /*
           * Filter out devices that we don't want.  Level 3 LUNs could
           * probably be supported, but the docs don't give enough of a
           * hint to know how.
           *
           * The mode field of the physical address is likely set to have
           * hard disks masked out.  Honor it unless the user has overridden
           * us with the tunable.  We also munge the inquiry data for these
           * disks so that they only show up as passthrough devices.  Keeping
           * them visible in this fashion is useful for doing things like
           * flashing firmware.
           */
          ea = cll->lun[i].physical.extra_address;
          if ((CISS_EXTRA_BUS3(ea) != 0) || (CISS_EXTRA_TARGET3(ea) != 0) ||
              (CISS_EXTRA_MODE2(ea) == 0x3))
              continue;
          if ((ciss_expose_hidden_physical == 0) &&
             (cll->lun[i].physical.mode == CISS_HDR_ADDRESS_MODE_MASK_PERIPHERAL))
              continue;
  
          /*
           * Note: CISS firmware numbers physical busses starting at '1', not
           *       ''.  This numbering is internal to the firmware and is only
           *       used as a hint here.
           */
          bus = CISS_EXTRA_BUS2(ea) - 1;
          target = CISS_EXTRA_TARGET2(ea);
          sc->ciss_physical[bus][target].cp_address = cll->lun[i];
          sc->ciss_physical[bus][target].cp_online = 1;
      }
  
      return (0);
  }
  
  static int
  ciss_inquiry_logical(struct ciss_softc *sc, struct ciss_ldrive *ld)
  {
      struct ciss_request                 *cr;
      struct ciss_command                 *cc;
      struct scsi_inquiry                 *inq;
      int                                 error;
      int                                 command_status;
  
      cr = NULL;
  
      bzero(&ld->cl_geometry, sizeof(ld->cl_geometry));
  
      if ((error = ciss_get_request(sc, &cr)) != 0)
          goto out;
  
      cc = cr->cr_cc;
      cr->cr_data = &ld->cl_geometry;
      cr->cr_length = sizeof(ld->cl_geometry);
      cr->cr_flags = CISS_REQ_DATAIN;
  
      cc->header.address = ld->cl_address;
      cc->cdb.cdb_length = 6;
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 30;
  
      inq = (struct scsi_inquiry *)&(cc->cdb.cdb[0]);
      inq->opcode = INQUIRY;
      inq->byte2 = SI_EVPD;
      inq->page_code = CISS_VPD_LOGICAL_DRIVE_GEOMETRY;
      scsi_ulto2b(sizeof(ld->cl_geometry), inq->length);
  
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error getting geometry (%d)\n", error);
          goto out;
      }
  
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
      case CISS_CMD_STATUS_DATA_UNDERRUN:
          break;
      case CISS_CMD_STATUS_DATA_OVERRUN:
          ciss_printf(sc, "WARNING: Data overrun\n");
          break;
      default:
          ciss_printf(sc, "Error detecting logical drive geometry (%s)\n",
                      ciss_name_command_status(command_status));
          break;
      }
  
  out:
      if (cr != NULL)
          ciss_release_request(cr);
      return(error);
  }
  /************************************************************************
   * Identify a logical drive, initialise state related to it.
   */
  static int
  ciss_identify_logical(struct ciss_softc *sc, struct ciss_ldrive *ld)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_bmic_cdb        *cbc;
      int                         error, command_status;
  
      debug_called(1);
  
      cr = NULL;
  
      /*
       * Build a BMIC request to fetch the drive ID.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ID_LDRIVE,
                                         (void **)&ld->cl_ldrive,
                                         sizeof(*ld->cl_ldrive))) != 0)
          goto out;
      cc = cr->cr_cc;
      cc->header.address = *ld->cl_controller;    /* target controller */
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      cbc->log_drive = CISS_LUN_TO_TARGET(ld->cl_address.logical.lun);
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error sending BMIC LDRIVE command (%d)\n", error);
          goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:               /* buffer right size */
          break;
      case CISS_CMD_STATUS_DATA_UNDERRUN:
      case CISS_CMD_STATUS_DATA_OVERRUN:
          ciss_printf(sc, "data over/underrun reading logical drive ID\n");
      default:
          ciss_printf(sc, "error reading logical drive ID (%s)\n",
                      ciss_name_command_status(command_status));
          error = EIO;
          goto out;
      }
      ciss_release_request(cr);
      cr = NULL;
  
      /*
       * Build a CISS BMIC command to get the logical drive status.
       */
      if ((error = ciss_get_ldrive_status(sc, ld)) != 0)
          goto out;
  
      /*
       * Get the logical drive geometry.
       */
      if ((error = ciss_inquiry_logical(sc, ld)) != 0)
          goto out;
  
      /*
       * Print the drive's basic characteristics.
       */
      if (bootverbose) {
          ciss_printf(sc, "logical drive (b%dt%d): %s, %dMB ",
                      CISS_LUN_TO_BUS(ld->cl_address.logical.lun),
                      CISS_LUN_TO_TARGET(ld->cl_address.logical.lun),
                      ciss_name_ldrive_org(ld->cl_ldrive->fault_tolerance),
                      ((ld->cl_ldrive->blocks_available / (1024 * 1024)) *
                       ld->cl_ldrive->block_size));
  
          ciss_print_ldrive(sc, ld);
      }
  out:
      if (error != 0) {
          /* make the drive not-exist */
          ld->cl_status = CISS_LD_NONEXISTENT;
          if (ld->cl_ldrive != NULL) {
              free(ld->cl_ldrive, CISS_MALLOC_CLASS);
              ld->cl_ldrive = NULL;
          }
          if (ld->cl_lstatus != NULL) {
              free(ld->cl_lstatus, CISS_MALLOC_CLASS);
              ld->cl_lstatus = NULL;
          }
      }
      if (cr != NULL)
          ciss_release_request(cr);
  
      return(error);
  }
  
  /************************************************************************
   * Get status for a logical drive.
   *
   * XXX should we also do this in response to Test Unit Ready?
   */
  static int
  ciss_get_ldrive_status(struct ciss_softc *sc,  struct ciss_ldrive *ld)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_bmic_cdb        *cbc;
      int                         error, command_status;
  
      /*
       * Build a CISS BMIC command to get the logical drive status.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ID_LSTATUS,
                                         (void **)&ld->cl_lstatus,
                                         sizeof(*ld->cl_lstatus))) != 0)
          goto out;
      cc = cr->cr_cc;
      cc->header.address = *ld->cl_controller;    /* target controller */
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      cbc->log_drive = CISS_LUN_TO_TARGET(ld->cl_address.logical.lun);
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error sending BMIC LSTATUS command (%d)\n", error);
          goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:               /* buffer right size */
          break;
      case CISS_CMD_STATUS_DATA_UNDERRUN:
      case CISS_CMD_STATUS_DATA_OVERRUN:
          ciss_printf(sc, "data over/underrun reading logical drive status\n");
      default:
          ciss_printf(sc, "error reading logical drive status (%s)\n",
                      ciss_name_command_status(command_status));
          error = EIO;
          goto out;
      }
  
      /*
       * Set the drive's summary status based on the returned status.
       *
       * XXX testing shows that a failed JBOD drive comes back at next
       * boot in "queued for expansion" mode.  WTF?
       */
      ld->cl_status = ciss_decode_ldrive_status(ld->cl_lstatus->status);
  
  out:
      if (cr != NULL)
          ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Notify the adapter of a config update.
   */
  static int
  ciss_update_config(struct ciss_softc *sc)
  {
      int         i;
  
      debug_called(1);
  
      CISS_TL_SIMPLE_WRITE(sc, CISS_TL_SIMPLE_IDBR, CISS_TL_SIMPLE_IDBR_CFG_TABLE);
      for (i = 0; i < 1000; i++) {
          if (!(CISS_TL_SIMPLE_READ(sc, CISS_TL_SIMPLE_IDBR) &
                CISS_TL_SIMPLE_IDBR_CFG_TABLE)) {
              return(0);
          }
          DELAY(1000);
      }
      return(1);
  }
  
  /************************************************************************
   * Accept new media into a logical drive.
   *
   * XXX The drive has previously been offline; it would be good if we
   *     could make sure it's not open right now.
   */
  static int
  ciss_accept_media(struct ciss_softc *sc, struct ciss_ldrive *ld)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_bmic_cdb        *cbc;
      int                         command_status;
      int                         error = 0, ldrive;
  
      ldrive = CISS_LUN_TO_TARGET(ld->cl_address.logical.lun);
  
      debug(0, "bringing logical drive %d back online", ldrive);
  
      /*
       * Build a CISS BMIC command to bring the drive back online.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_BMIC_ACCEPT_MEDIA,
                                         NULL, 0)) != 0)
          goto out;
      cc = cr->cr_cc;
      cc->header.address = *ld->cl_controller;    /* target controller */
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      cbc->log_drive = ldrive;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error sending BMIC ACCEPT MEDIA command (%d)\n", error);
          goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:               /* all OK */
          /* we should get a logical drive status changed event here */
          break;
      default:
          ciss_printf(cr->cr_sc, "error accepting media into failed logical drive (%s)\n",
                      ciss_name_command_status(command_status));
          break;
      }
  
  out:
      if (cr != NULL)
          ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Release adapter resources.
   */
  static void
  ciss_free(struct ciss_softc *sc)
  {
      struct ciss_request *cr;
      int                 i, j;
  
      debug_called(1);
  
      /* we're going away */
      sc->ciss_flags |= CISS_FLAG_ABORTING;
  
      /* terminate the periodic heartbeat routine */
      callout_stop(&sc->ciss_periodic);
  
      /* cancel the Event Notify chain */
      ciss_notify_abort(sc);
  
      ciss_kill_notify_thread(sc);
  
      /* disconnect from CAM */
      if (sc->ciss_cam_sim) {
          for (i = 0; i < sc->ciss_max_logical_bus; i++) {
              if (sc->ciss_cam_sim[i]) {
                  xpt_bus_deregister(cam_sim_path(sc->ciss_cam_sim[i]));
                  cam_sim_free(sc->ciss_cam_sim[i], 0);
              }
          }
          for (i = CISS_PHYSICAL_BASE; i < sc->ciss_max_physical_bus +
               CISS_PHYSICAL_BASE; i++) {
              if (sc->ciss_cam_sim[i]) {
                  xpt_bus_deregister(cam_sim_path(sc->ciss_cam_sim[i]));
                  cam_sim_free(sc->ciss_cam_sim[i], 0);
              }
          }
          free(sc->ciss_cam_sim, CISS_MALLOC_CLASS);
      }
      if (sc->ciss_cam_devq)
          cam_simq_free(sc->ciss_cam_devq);
  
      /* remove the control device */
      mtx_unlock(&sc->ciss_mtx);
      if (sc->ciss_dev_t != NULL)
          destroy_dev(sc->ciss_dev_t);
  
      /* Final cleanup of the callout. */
      callout_drain(&sc->ciss_periodic);
      mtx_destroy(&sc->ciss_mtx);
  
      /* free the controller data */
      if (sc->ciss_id != NULL)
          free(sc->ciss_id, CISS_MALLOC_CLASS);
  
      /* release I/O resources */
      if (sc->ciss_regs_resource != NULL)
          bus_release_resource(sc->ciss_dev, SYS_RES_MEMORY,
                               sc->ciss_regs_rid, sc->ciss_regs_resource);
      if (sc->ciss_cfg_resource != NULL)
          bus_release_resource(sc->ciss_dev, SYS_RES_MEMORY,
                               sc->ciss_cfg_rid, sc->ciss_cfg_resource);
      if (sc->ciss_intr != NULL)
          bus_teardown_intr(sc->ciss_dev, sc->ciss_irq_resource, sc->ciss_intr);
      if (sc->ciss_irq_resource != NULL)
          bus_release_resource(sc->ciss_dev, SYS_RES_IRQ,
                               sc->ciss_irq_rid[0], sc->ciss_irq_resource);
      if (sc->ciss_msi)
          pci_release_msi(sc->ciss_dev);
  
      while ((cr = ciss_dequeue_free(sc)) != NULL)
          bus_dmamap_destroy(sc->ciss_buffer_dmat, cr->cr_datamap);
      if (sc->ciss_buffer_dmat)
          bus_dma_tag_destroy(sc->ciss_buffer_dmat);
  
      /* destroy command memory and DMA tag */
      if (sc->ciss_command != NULL) {
          bus_dmamap_unload(sc->ciss_command_dmat, sc->ciss_command_map);
          bus_dmamem_free(sc->ciss_command_dmat, sc->ciss_command, sc->ciss_command_map);
      }
      if (sc->ciss_command_dmat)
          bus_dma_tag_destroy(sc->ciss_command_dmat);
  
      if (sc->ciss_reply) {
          bus_dmamap_unload(sc->ciss_reply_dmat, sc->ciss_reply_map);
          bus_dmamem_free(sc->ciss_reply_dmat, sc->ciss_reply, sc->ciss_reply_map);
      }
      if (sc->ciss_reply_dmat)
          bus_dma_tag_destroy(sc->ciss_reply_dmat);
  
      /* destroy DMA tags */
      if (sc->ciss_parent_dmat)
          bus_dma_tag_destroy(sc->ciss_parent_dmat);
      if (sc->ciss_logical) {
          for (i = 0; i < sc->ciss_max_logical_bus; i++) {
              for (j = 0; j < sc->ciss_cfg->max_logical_supported; j++) {
                  if (sc->ciss_logical[i][j].cl_ldrive)
                      free(sc->ciss_logical[i][j].cl_ldrive, CISS_MALLOC_CLASS);
                  if (sc->ciss_logical[i][j].cl_lstatus)
                      free(sc->ciss_logical[i][j].cl_lstatus, CISS_MALLOC_CLASS);
              }
              free(sc->ciss_logical[i], CISS_MALLOC_CLASS);
          }
          free(sc->ciss_logical, CISS_MALLOC_CLASS);
      }
  
      if (sc->ciss_physical) {
          for (i = 0; i < sc->ciss_max_physical_bus; i++)
              free(sc->ciss_physical[i], CISS_MALLOC_CLASS);
          free(sc->ciss_physical, CISS_MALLOC_CLASS);
      }
  
      if (sc->ciss_controllers)
          free(sc->ciss_controllers, CISS_MALLOC_CLASS);
  
  }
  
  /************************************************************************
   * Give a command to the adapter.
   *
   * Note that this uses the simple transport layer directly.  If we
   * want to add support for other layers, we'll need a switch of some
   * sort.
   *
   * Note that the simple transport layer has no way of refusing a
   * command; we only have as many request structures as the adapter
   * supports commands, so we don't have to check (this presumes that
   * the adapter can handle commands as fast as we throw them at it).
   */
  static int
  ciss_start(struct ciss_request *cr)
  {
      struct ciss_command *cc;    /* XXX debugging only */
      int                 error;
  
      cc = cr->cr_cc;
      debug(2, "post command %d tag %d ", cr->cr_tag, cc->header.host_tag);
  
      /*
       * Map the request's data.
       */
      if ((error = ciss_map_request(cr)))
          return(error);
  
  #if 0
      ciss_print_request(cr);
  #endif
  
      return(0);
  }
  
  /************************************************************************
   * Fetch completed request(s) from the adapter, queue them for
   * completion handling.
   *
   * Note that this uses the simple transport layer directly.  If we
   * want to add support for other layers, we'll need a switch of some
   * sort.
   *
   * Note that the simple transport mechanism does not require any
   * reentrancy protection; the OPQ read is atomic.  If there is a
   * chance of a race with something else that might move the request
   * off the busy list, then we will have to lock against that
   * (eg. timeouts, etc.)
   */
  static void
  ciss_done(struct ciss_softc *sc, cr_qhead_t *qh)
  {
      struct ciss_request *cr;
      struct ciss_command *cc;
      u_int32_t           tag, index;
  
      debug_called(3);
  
      /*
       * Loop quickly taking requests from the adapter and moving them
       * to the completed queue.
       */
      for (;;) {
  
          tag = CISS_TL_SIMPLE_FETCH_CMD(sc);
          if (tag == CISS_TL_SIMPLE_OPQ_EMPTY)
              break;
          index = tag >> 2;
          debug(2, "completed command %d%s", index,
                (tag & CISS_HDR_HOST_TAG_ERROR) ? " with error" : "");
          if (index >= sc->ciss_max_requests) {
              ciss_printf(sc, "completed invalid request %d (0x%x)\n", index, tag);
              continue;
          }
          cr = &(sc->ciss_request[index]);
          cc = cr->cr_cc;
          cc->header.host_tag = tag;      /* not updated by adapter */
          ciss_enqueue_complete(cr, qh);
      }
  
  }
  
  static void
  ciss_perf_done(struct ciss_softc *sc, cr_qhead_t *qh)
  {
      struct ciss_request *cr;
      struct ciss_command *cc;
      u_int32_t           tag, index;
  
      debug_called(3);
  
      /*
       * Loop quickly taking requests from the adapter and moving them
       * to the completed queue.
       */
      for (;;) {
          tag = sc->ciss_reply[sc->ciss_rqidx];
          if ((tag & CISS_CYCLE_MASK) != sc->ciss_cycle)
              break;
          index = tag >> 2;
          debug(2, "completed command %d%s\n", index,
                (tag & CISS_HDR_HOST_TAG_ERROR) ? " with error" : "");
          if (index < sc->ciss_max_requests) {
              cr = &(sc->ciss_request[index]);
              cc = cr->cr_cc;
              cc->header.host_tag = tag;  /* not updated by adapter */
              ciss_enqueue_complete(cr, qh);
          } else {
              ciss_printf(sc, "completed invalid request %d (0x%x)\n", index, tag);
          }
          if (++sc->ciss_rqidx == sc->ciss_max_requests) {
              sc->ciss_rqidx = 0;
              sc->ciss_cycle ^= 1;
          }
      }
  
  }
  
  /************************************************************************
   * Take an interrupt from the adapter.
   */
  static void
  ciss_intr(void *arg)
  {
      cr_qhead_t qh;
      struct ciss_softc   *sc = (struct ciss_softc *)arg;
  
      /*
       * The only interrupt we recognise indicates that there are
       * entries in the outbound post queue.
       */
      STAILQ_INIT(&qh);
      ciss_done(sc, &qh);
      mtx_lock(&sc->ciss_mtx);
      ciss_complete(sc, &qh);
      mtx_unlock(&sc->ciss_mtx);
  }
  
  static void
  ciss_perf_intr(void *arg)
  {
      struct ciss_softc   *sc = (struct ciss_softc *)arg;
  
      /* Clear the interrupt and flush the bridges.  Docs say that the flush
       * needs to be done twice, which doesn't seem right.
       */
      CISS_TL_PERF_CLEAR_INT(sc);
      CISS_TL_PERF_FLUSH_INT(sc);
  
      ciss_perf_msi_intr(sc);
  }
  
  static void
  ciss_perf_msi_intr(void *arg)
  {
      cr_qhead_t qh;
      struct ciss_softc   *sc = (struct ciss_softc *)arg;
  
      STAILQ_INIT(&qh);
      ciss_perf_done(sc, &qh);
      mtx_lock(&sc->ciss_mtx);
      ciss_complete(sc, &qh);
      mtx_unlock(&sc->ciss_mtx);
  }
  
  
  /************************************************************************
   * Process completed requests.
   *
   * Requests can be completed in three fashions:
   *
   * - by invoking a callback function (cr_complete is non-null)
   * - by waking up a sleeper (cr_flags has CISS_REQ_SLEEP set)
   * - by clearing the CISS_REQ_POLL flag in interrupt/timeout context
   */
  static void
  ciss_complete(struct ciss_softc *sc, cr_qhead_t *qh)
  {
      struct ciss_request *cr;
  
      debug_called(2);
  
      /*
       * Loop taking requests off the completed queue and performing
       * completion processing on them.
       */
      for (;;) {
          if ((cr = ciss_dequeue_complete(sc, qh)) == NULL)
              break;
          ciss_unmap_request(cr);
  
          if ((cr->cr_flags & CISS_REQ_BUSY) == 0)
              ciss_printf(sc, "WARNING: completing non-busy request\n");
          cr->cr_flags &= ~CISS_REQ_BUSY;
  
          /*
           * If the request has a callback, invoke it.
           */
          if (cr->cr_complete != NULL) {
              cr->cr_complete(cr);
              continue;
          }
  
          /*
           * If someone is sleeping on this request, wake them up.
           */
          if (cr->cr_flags & CISS_REQ_SLEEP) {
              cr->cr_flags &= ~CISS_REQ_SLEEP;
              wakeup(cr);
              continue;
          }
  
          /*
           * If someone is polling this request for completion, signal.
           */
          if (cr->cr_flags & CISS_REQ_POLL) {
              cr->cr_flags &= ~CISS_REQ_POLL;
              continue;
          }
  
          /*
           * Give up and throw the request back on the free queue.  This
           * should never happen; resources will probably be lost.
           */
          ciss_printf(sc, "WARNING: completed command with no submitter\n");
          ciss_enqueue_free(cr);
      }
  }
  
  /************************************************************************
   * Report on the completion status of a request, and pass back SCSI
   * and command status values.
   */
  static int
  _ciss_report_request(struct ciss_request *cr, int *command_status, int *scsi_status, const char *func)
  {
      struct ciss_command         *cc;
      struct ciss_error_info      *ce;
  
      debug_called(2);
  
      cc = cr->cr_cc;
      ce = (struct ciss_error_info *)&(cc->sg[0]);
  
      /*
       * We don't consider data under/overrun an error for the Report
       * Logical/Physical LUNs commands.
       */
      if ((cc->header.host_tag & CISS_HDR_HOST_TAG_ERROR) &&
          ((ce->command_status == CISS_CMD_STATUS_DATA_OVERRUN) ||
           (ce->command_status == CISS_CMD_STATUS_DATA_UNDERRUN)) &&
          ((cc->cdb.cdb[0] == CISS_OPCODE_REPORT_LOGICAL_LUNS) ||
           (cc->cdb.cdb[0] == CISS_OPCODE_REPORT_PHYSICAL_LUNS) ||
           (cc->cdb.cdb[0] == INQUIRY))) {
          cc->header.host_tag &= ~CISS_HDR_HOST_TAG_ERROR;
          debug(2, "ignoring irrelevant under/overrun error");
      }
  
      /*
       * Check the command's error bit, if clear, there's no status and
       * everything is OK.
       */
      if (!(cc->header.host_tag & CISS_HDR_HOST_TAG_ERROR)) {
          if (scsi_status != NULL)
              *scsi_status = SCSI_STATUS_OK;
          if (command_status != NULL)
              *command_status = CISS_CMD_STATUS_SUCCESS;
          return(0);
      } else {
          if (command_status != NULL)
              *command_status = ce->command_status;
          if (scsi_status != NULL) {
              if (ce->command_status == CISS_CMD_STATUS_DATA_UNDERRUN) {
                  *scsi_status = SCSI_STATUS_OK;
              } else if (ce->command_status == CISS_CMD_STATUS_TARGET_STATUS) {
                  *scsi_status = ce->scsi_status;
              } else {
                  *scsi_status = -1;
              }
          }
          if (bootverbose && ce->command_status != CISS_CMD_STATUS_DATA_UNDERRUN)
              ciss_printf(cr->cr_sc, "command status 0x%x (%s) scsi status 0x%x\n",
                          ce->command_status, ciss_name_command_status(ce->command_status),
                          ce->scsi_status);
          if (ce->command_status == CISS_CMD_STATUS_INVALID_COMMAND) {
              ciss_printf(cr->cr_sc, "invalid command, offense size %d at %d, value 0x%x, function %s\n",
                          ce->additional_error_info.invalid_command.offense_size,
                          ce->additional_error_info.invalid_command.offense_offset,
                          ce->additional_error_info.invalid_command.offense_value,
                          func);
          }
      }
  #if 0
      ciss_print_request(cr);
  #endif
      return(1);
  }
  
  /************************************************************************
   * Issue a request and don't return until it's completed.
   *
   * Depending on adapter status, we may poll or sleep waiting for
   * completion.
   */
  static int
  ciss_synch_request(struct ciss_request *cr, int timeout)
  {
      if (cr->cr_sc->ciss_flags & CISS_FLAG_RUNNING) {
          return(ciss_wait_request(cr, timeout));
      } else {
          return(ciss_poll_request(cr, timeout));
      }
  }
  
  /************************************************************************
   * Issue a request and poll for completion.
   *
   * Timeout in milliseconds.
   */
  static int
  ciss_poll_request(struct ciss_request *cr, int timeout)
  {
      cr_qhead_t qh;
      struct ciss_softc *sc;
      int         error;
  
      debug_called(2);
  
      STAILQ_INIT(&qh);
      sc = cr->cr_sc;
      cr->cr_flags |= CISS_REQ_POLL;
      if ((error = ciss_start(cr)) != 0)
          return(error);
  
      do {
          if (sc->ciss_perf)
              ciss_perf_done(sc, &qh);
          else
              ciss_done(sc, &qh);
          ciss_complete(sc, &qh);
          if (!(cr->cr_flags & CISS_REQ_POLL))
              return(0);
          DELAY(1000);
      } while (timeout-- >= 0);
      return(EWOULDBLOCK);
  }
  
  /************************************************************************
   * Issue a request and sleep waiting for completion.
   *
   * Timeout in milliseconds.  Note that a spurious wakeup will reset
   * the timeout.
   */
  static int
  ciss_wait_request(struct ciss_request *cr, int timeout)
  {
      int         error;
  
      debug_called(2);
  
      cr->cr_flags |= CISS_REQ_SLEEP;
      if ((error = ciss_start(cr)) != 0)
          return(error);
  
      while ((cr->cr_flags & CISS_REQ_SLEEP) && (error != EWOULDBLOCK)) {
          error = msleep_sbt(cr, &cr->cr_sc->ciss_mtx, PRIBIO, "cissREQ",
              SBT_1MS * timeout, 0, 0);
      }
      return(error);
  }
  
  #if 0
  /************************************************************************
   * Abort a request.  Note that a potential exists here to race the
   * request being completed; the caller must deal with this.
   */
  static int
  ciss_abort_request(struct ciss_request *ar)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_message_cdb     *cmc;
      int                         error;
  
      debug_called(1);
  
      /* get a request */
      if ((error = ciss_get_request(ar->cr_sc, &cr)) != 0)
          return(error);
  
      /* build the abort command */
      cc = cr->cr_cc;
      cc->header.address.mode.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;    /* addressing? */
      cc->header.address.physical.target = 0;
      cc->header.address.physical.bus = 0;
      cc->cdb.cdb_length = sizeof(*cmc);
      cc->cdb.type = CISS_CDB_TYPE_MESSAGE;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_NONE;
      cc->cdb.timeout = 30;
  
      cmc = (struct ciss_message_cdb *)&(cc->cdb.cdb[0]);
      cmc->opcode = CISS_OPCODE_MESSAGE_ABORT;
      cmc->type = CISS_MESSAGE_ABORT_TASK;
      cmc->abort_tag = ar->cr_tag;        /* endianness?? */
  
      /*
       * Send the request and wait for a response.  If we believe we
       * aborted the request OK, clear the flag that indicates it's
       * running.
       */
      error = ciss_synch_request(cr, 35 * 1000);
      if (!error)
          error = ciss_report_request(cr, NULL, NULL);
      ciss_release_request(cr);
  
      return(error);
  }
  #endif
  
  
  /************************************************************************
   * Fetch and initialise a request
   */
  static int
  ciss_get_request(struct ciss_softc *sc, struct ciss_request **crp)
  {
      struct ciss_request *cr;
  
      debug_called(2);
  
      /*
       * Get a request and clean it up.
       */
      if ((cr = ciss_dequeue_free(sc)) == NULL)
          return(ENOMEM);
  
      cr->cr_data = NULL;
      cr->cr_flags = 0;
      cr->cr_complete = NULL;
      cr->cr_private = NULL;
      cr->cr_sg_tag = CISS_SG_MAX;        /* Backstop to prevent accidents */
  
      ciss_preen_command(cr);
      *crp = cr;
      return(0);
  }
  
  static void
  ciss_preen_command(struct ciss_request *cr)
  {
      struct ciss_command *cc;
      u_int32_t           cmdphys;
  
      /*
       * Clean up the command structure.
       *
       * Note that we set up the error_info structure here, since the
       * length can be overwritten by any command.
       */
      cc = cr->cr_cc;
      cc->header.sg_in_list = 0;          /* kinda inefficient this way */
      cc->header.sg_total = 0;
      cc->header.host_tag = cr->cr_tag << 2;
      cc->header.host_tag_zeroes = 0;
      bzero(&(cc->sg[0]), CISS_COMMAND_ALLOC_SIZE - sizeof(struct ciss_command));
      cmdphys = cr->cr_ccphys;
      cc->error_info.error_info_address = cmdphys + sizeof(struct ciss_command);
      cc->error_info.error_info_length = CISS_COMMAND_ALLOC_SIZE - sizeof(struct ciss_command);
  }
  
  /************************************************************************
   * Release a request to the free list.
   */
  static void
  ciss_release_request(struct ciss_request *cr)
  {
      struct ciss_softc   *sc;
  
      debug_called(2);
  
      sc = cr->cr_sc;
  
      /* release the request to the free queue */
      ciss_requeue_free(cr);
  }
  
  /************************************************************************
   * Allocate a request that will be used to send a BMIC command.  Do some
   * of the common setup here to avoid duplicating it everywhere else.
   */
  static int
  ciss_get_bmic_request(struct ciss_softc *sc, struct ciss_request **crp,
                        int opcode, void **bufp, size_t bufsize)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_bmic_cdb        *cbc;
      void                        *buf;
      int                         error;
      int                         dataout;
  
      debug_called(2);
  
      cr = NULL;
      buf = NULL;
  
      /*
       * Get a request.
       */
      if ((error = ciss_get_request(sc, &cr)) != 0)
          goto out;
  
      /*
       * Allocate data storage if requested, determine the data direction.
       */
      dataout = 0;
      if ((bufsize > 0) && (bufp != NULL)) {
          if (*bufp == NULL) {
              if ((buf = malloc(bufsize, CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO)) == NULL) {
                  error = ENOMEM;
                  goto out;
              }
          } else {
              buf = *bufp;
              dataout = 1;        /* we are given a buffer, so we are writing */
          }
      }
  
      /*
       * Build a CISS BMIC command to get the logical drive ID.
       */
      cr->cr_data = buf;
      cr->cr_length = bufsize;
      if (!dataout)
          cr->cr_flags = CISS_REQ_DATAIN;
  
      cc = cr->cr_cc;
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
      cc->cdb.cdb_length = sizeof(*cbc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = dataout ? CISS_CDB_DIRECTION_WRITE : CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 0;
  
      cbc = (struct ciss_bmic_cdb *)&(cc->cdb.cdb[0]);
      bzero(cbc, sizeof(*cbc));
      cbc->opcode = dataout ? CISS_ARRAY_CONTROLLER_WRITE : CISS_ARRAY_CONTROLLER_READ;
      cbc->bmic_opcode = opcode;
      cbc->size = htons((u_int16_t)bufsize);
  
  out:
      if (error) {
          if (cr != NULL)
              ciss_release_request(cr);
      } else {
          *crp = cr;
          if ((bufp != NULL) && (*bufp == NULL) && (buf != NULL))
              *bufp = buf;
      }
      return(error);
  }
  
  /************************************************************************
   * Handle a command passed in from userspace.
   */
  static int
  ciss_user_command(struct ciss_softc *sc, IOCTL_Command_struct *ioc)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_error_info      *ce;
      int                         error = 0;
  
      debug_called(1);
  
      cr = NULL;
  
      /*
       * Get a request.
       */
      while (ciss_get_request(sc, &cr) != 0)
          msleep(sc, &sc->ciss_mtx, PPAUSE, "cissREQ", hz);
      cc = cr->cr_cc;
  
      /*
       * Allocate an in-kernel databuffer if required, copy in user data.
       */
      mtx_unlock(&sc->ciss_mtx);
      cr->cr_length = ioc->buf_size;
      if (ioc->buf_size > 0) {
          if ((cr->cr_data = malloc(ioc->buf_size, CISS_MALLOC_CLASS, M_NOWAIT)) == NULL) {
              error = ENOMEM;
              goto out_unlocked;
          }
          if ((error = copyin(ioc->buf, cr->cr_data, ioc->buf_size))) {
              debug(0, "copyin: bad data buffer %p/%d", ioc->buf, ioc->buf_size);
              goto out_unlocked;
          }
      }
  
      /*
       * Build the request based on the user command.
       */
      bcopy(&ioc->LUN_info, &cc->header.address, sizeof(cc->header.address));
      bcopy(&ioc->Request, &cc->cdb, sizeof(cc->cdb));
  
      /* XXX anything else to populate here? */
      mtx_lock(&sc->ciss_mtx);
  
      /*
       * Run the command.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000))) {
          debug(0, "request failed - %d", error);
          goto out;
      }
  
      /*
       * Check to see if the command succeeded.
       */
      ce = (struct ciss_error_info *)&(cc->sg[0]);
      if ((cc->header.host_tag & CISS_HDR_HOST_TAG_ERROR) == 0)
          bzero(ce, sizeof(*ce));
  
      /*
       * Copy the results back to the user.
       */
      bcopy(ce, &ioc->error_info, sizeof(*ce));
      mtx_unlock(&sc->ciss_mtx);
      if ((ioc->buf_size > 0) &&
          (error = copyout(cr->cr_data, ioc->buf, ioc->buf_size))) {
          debug(0, "copyout: bad data buffer %p/%d", ioc->buf, ioc->buf_size);
          goto out_unlocked;
      }
  
      /* done OK */
      error = 0;
  
  out_unlocked:
      mtx_lock(&sc->ciss_mtx);
  
  out:
      if ((cr != NULL) && (cr->cr_data != NULL))
          free(cr->cr_data, CISS_MALLOC_CLASS);
      if (cr != NULL)
          ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Map a request into bus-visible space, initialise the scatter/gather
   * list.
   */
  static int
  ciss_map_request(struct ciss_request *cr)
  {
      struct ciss_softc   *sc;
      int                 error = 0;
  
      debug_called(2);
  
      sc = cr->cr_sc;
  
      /* check that mapping is necessary */
      if (cr->cr_flags & CISS_REQ_MAPPED)
          return(0);
  
      cr->cr_flags |= CISS_REQ_MAPPED;
  
      bus_dmamap_sync(sc->ciss_command_dmat, sc->ciss_command_map,
                      BUS_DMASYNC_PREWRITE);
  
      if (cr->cr_data != NULL) {
          if (cr->cr_flags & CISS_REQ_CCB)
                  error = bus_dmamap_load_ccb(sc->ciss_buffer_dmat,
                                          cr->cr_datamap, cr->cr_data,
                                          ciss_request_map_helper, cr, 0);
          else
                  error = bus_dmamap_load(sc->ciss_buffer_dmat, cr->cr_datamap,
                                          cr->cr_data, cr->cr_length,
                                          ciss_request_map_helper, cr, 0);
          if (error != 0)
              return (error);
      } else {
          /*
           * Post the command to the adapter.
           */
          cr->cr_sg_tag = CISS_SG_NONE;
          cr->cr_flags |= CISS_REQ_BUSY;
          if (sc->ciss_perf)
              CISS_TL_PERF_POST_CMD(sc, cr);
          else
              CISS_TL_SIMPLE_POST_CMD(sc, cr->cr_ccphys);
      }
  
      return(0);
  }
  
  static void
  ciss_request_map_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  {
      struct ciss_command *cc;
      struct ciss_request *cr;
      struct ciss_softc   *sc;
      int                 i;
  
      debug_called(2);
  
      cr = (struct ciss_request *)arg;
      sc = cr->cr_sc;
      cc = cr->cr_cc;
  
      for (i = 0; i < nseg; i++) {
          cc->sg[i].address = segs[i].ds_addr;
          cc->sg[i].length = segs[i].ds_len;
          cc->sg[i].extension = 0;
      }
      /* we leave the s/g table entirely within the command */
      cc->header.sg_in_list = nseg;
      cc->header.sg_total = nseg;
  
      if (cr->cr_flags & CISS_REQ_DATAIN)
          bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_PREREAD);
      if (cr->cr_flags & CISS_REQ_DATAOUT)
          bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_PREWRITE);
  
      if (nseg == 0)
          cr->cr_sg_tag = CISS_SG_NONE;
      else if (nseg == 1)
          cr->cr_sg_tag = CISS_SG_1;
      else if (nseg == 2)
          cr->cr_sg_tag = CISS_SG_2;
      else if (nseg <= 4)
          cr->cr_sg_tag = CISS_SG_4;
      else if (nseg <= 8)
          cr->cr_sg_tag = CISS_SG_8;
      else if (nseg <= 16)
          cr->cr_sg_tag = CISS_SG_16;
      else if (nseg <= 32)
          cr->cr_sg_tag = CISS_SG_32;
      else
          cr->cr_sg_tag = CISS_SG_MAX;
  
      /*
       * Post the command to the adapter.
       */
      cr->cr_flags |= CISS_REQ_BUSY;
      if (sc->ciss_perf)
          CISS_TL_PERF_POST_CMD(sc, cr);
      else
          CISS_TL_SIMPLE_POST_CMD(sc, cr->cr_ccphys);
  }
  
  /************************************************************************
   * Unmap a request from bus-visible space.
   */
  static void
  ciss_unmap_request(struct ciss_request *cr)
  {
      struct ciss_softc   *sc;
  
      debug_called(2);
  
      sc = cr->cr_sc;
  
      /* check that unmapping is necessary */
      if ((cr->cr_flags & CISS_REQ_MAPPED) == 0)
          return;
  
      bus_dmamap_sync(sc->ciss_command_dmat, sc->ciss_command_map,
                      BUS_DMASYNC_POSTWRITE);
  
      if (cr->cr_data == NULL)
          goto out;
  
      if (cr->cr_flags & CISS_REQ_DATAIN)
          bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_POSTREAD);
      if (cr->cr_flags & CISS_REQ_DATAOUT)
          bus_dmamap_sync(sc->ciss_buffer_dmat, cr->cr_datamap, BUS_DMASYNC_POSTWRITE);
  
      bus_dmamap_unload(sc->ciss_buffer_dmat, cr->cr_datamap);
  out:
      cr->cr_flags &= ~CISS_REQ_MAPPED;
  }
  
  /************************************************************************
   * Attach the driver to CAM.
   *
   * We put all the logical drives on a single SCSI bus.
   */
  static int
  ciss_cam_init(struct ciss_softc *sc)
  {
      int                 i, maxbus;
  
      debug_called(1);
  
      /*
       * Allocate a devq.  We can reuse this for the masked physical
       * devices if we decide to export these as well.
       */
      if ((sc->ciss_cam_devq = cam_simq_alloc(sc->ciss_max_requests - 2)) == NULL) {
          ciss_printf(sc, "can't allocate CAM SIM queue\n");
          return(ENOMEM);
      }
  
      /*
       * Create a SIM.
       *
       * This naturally wastes a bit of memory.  The alternative is to allocate
       * and register each bus as it is found, and then track them on a linked
       * list.  Unfortunately, the driver has a few places where it needs to
       * look up the SIM based solely on bus number, and it's unclear whether
       * a list traversal would work for these situations.
       */
      maxbus = max(sc->ciss_max_logical_bus, sc->ciss_max_physical_bus +
                   CISS_PHYSICAL_BASE);
      sc->ciss_cam_sim = malloc(maxbus * sizeof(struct cam_sim*),
                                CISS_MALLOC_CLASS, M_NOWAIT | M_ZERO);
      if (sc->ciss_cam_sim == NULL) {
          ciss_printf(sc, "can't allocate memory for controller SIM\n");
          return(ENOMEM);
      }
  
      for (i = 0; i < sc->ciss_max_logical_bus; i++) {
          if ((sc->ciss_cam_sim[i] = cam_sim_alloc(ciss_cam_action, ciss_cam_poll,
                                                   "ciss", sc,
                                                   device_get_unit(sc->ciss_dev),
                                                   &sc->ciss_mtx,
                                                   2,
                                                   sc->ciss_max_requests - 2,
                                                   sc->ciss_cam_devq)) == NULL) {
              ciss_printf(sc, "can't allocate CAM SIM for controller %d\n", i);
              return(ENOMEM);
          }
  
          /*
           * Register bus with this SIM.
           */
          mtx_lock(&sc->ciss_mtx);
          if (i == 0 || sc->ciss_controllers[i].physical.bus != 0) { 
              if (xpt_bus_register(sc->ciss_cam_sim[i], sc->ciss_dev, i) != 0) {
                  ciss_printf(sc, "can't register SCSI bus %d\n", i);
                  mtx_unlock(&sc->ciss_mtx);
                  return (ENXIO);
              }
          }
          mtx_unlock(&sc->ciss_mtx);
      }
  
      for (i = CISS_PHYSICAL_BASE; i < sc->ciss_max_physical_bus +
           CISS_PHYSICAL_BASE; i++) {
          if ((sc->ciss_cam_sim[i] = cam_sim_alloc(ciss_cam_action, ciss_cam_poll,
                                                   "ciss", sc,
                                                   device_get_unit(sc->ciss_dev),
                                                   &sc->ciss_mtx, 1,
                                                   sc->ciss_max_requests - 2,
                                                   sc->ciss_cam_devq)) == NULL) {
              ciss_printf(sc, "can't allocate CAM SIM for controller %d\n", i);
              return (ENOMEM);
          }
  
          mtx_lock(&sc->ciss_mtx);
          if (xpt_bus_register(sc->ciss_cam_sim[i], sc->ciss_dev, i) != 0) {
              ciss_printf(sc, "can't register SCSI bus %d\n", i);
              mtx_unlock(&sc->ciss_mtx);
              return (ENXIO);
          }
          mtx_unlock(&sc->ciss_mtx);
      }
  
      return(0);
  }
  
  /************************************************************************
   * Initiate a rescan of the 'logical devices' SIM
   */
  static void
  ciss_cam_rescan_target(struct ciss_softc *sc, int bus, int target)
  {
      union ccb           *ccb;
  
      debug_called(1);
  
      if ((ccb = xpt_alloc_ccb_nowait()) == NULL) {
          ciss_printf(sc, "rescan failed (can't allocate CCB)\n");
          return;
      }
  
      if (xpt_create_path(&ccb->ccb_h.path, NULL,
              cam_sim_path(sc->ciss_cam_sim[bus]),
              target, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
          ciss_printf(sc, "rescan failed (can't create path)\n");
          xpt_free_ccb(ccb);
          return;
      }
      xpt_rescan(ccb);
      /* scan is now in progress */
  }
  
  /************************************************************************
   * Handle requests coming from CAM
   */
  static void
  ciss_cam_action(struct cam_sim *sim, union ccb *ccb)
  {
      struct ciss_softc   *sc;
      struct ccb_scsiio   *csio;
      int                 bus, target;
      int                 physical;
  
      sc = cam_sim_softc(sim);
      bus = cam_sim_bus(sim);
      csio = (struct ccb_scsiio *)&ccb->csio;
      target = csio->ccb_h.target_id;
      physical = CISS_IS_PHYSICAL(bus);
  
      switch (ccb->ccb_h.func_code) {
  
          /* perform SCSI I/O */
      case XPT_SCSI_IO:
          if (!ciss_cam_action_io(sim, csio))
              return;
          break;
  
          /* perform geometry calculations */
      case XPT_CALC_GEOMETRY:
      {
          struct ccb_calc_geometry        *ccg = &ccb->ccg;
          struct ciss_ldrive              *ld;
  
          debug(1, "XPT_CALC_GEOMETRY %d:%d:%d", cam_sim_bus(sim), ccb->ccb_h.target_id, ccb->ccb_h.target_lun);
  
          ld = NULL;
          if (!physical)
              ld = &sc->ciss_logical[bus][target];
              
          /*
           * Use the cached geometry settings unless the fault tolerance
           * is invalid.
           */
          if (physical || ld->cl_geometry.fault_tolerance == 0xFF) {
              u_int32_t                   secs_per_cylinder;
  
              ccg->heads = 255;
              ccg->secs_per_track = 32;
              secs_per_cylinder = ccg->heads * ccg->secs_per_track;
              ccg->cylinders = ccg->volume_size / secs_per_cylinder;
          } else {
              ccg->heads = ld->cl_geometry.heads;
              ccg->secs_per_track = ld->cl_geometry.sectors;
              ccg->cylinders = ntohs(ld->cl_geometry.cylinders);
          }
          ccb->ccb_h.status = CAM_REQ_CMP;
          break;
      }
  
          /* handle path attribute inquiry */
      case XPT_PATH_INQ:
      {
          struct ccb_pathinq      *cpi = &ccb->cpi;
          int                     sg_length;
  
          debug(1, "XPT_PATH_INQ %d:%d:%d", cam_sim_bus(sim), ccb->ccb_h.target_id, ccb->ccb_h.target_lun);
  
          cpi->version_num = 1;
          cpi->hba_inquiry = PI_TAG_ABLE; /* XXX is this correct? */
          cpi->target_sprt = 0;
          cpi->hba_misc = 0;
          cpi->max_target = sc->ciss_cfg->max_logical_supported;
          cpi->max_lun = 0;               /* 'logical drive' channel only */
          cpi->initiator_id = sc->ciss_cfg->max_logical_supported;
          strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
          strlcpy(cpi->hba_vid, "CISS", HBA_IDLEN);
          strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
          cpi->unit_number = cam_sim_unit(sim);
          cpi->bus_id = cam_sim_bus(sim);
          cpi->base_transfer_speed = 132 * 1024;  /* XXX what to set this to? */
          cpi->transport = XPORT_SPI;
          cpi->transport_version = 2;
          cpi->protocol = PROTO_SCSI;
          cpi->protocol_version = SCSI_REV_2;
          if (sc->ciss_cfg->max_sg_length == 0) {
                  sg_length = 17;
          } else {
          /* XXX Fix for ZMR cards that advertise max_sg_length == 32
           * Confusing bit here. max_sg_length is usually a power of 2. We always
           * need to subtract 1 to account for partial pages. Then we need to 
           * align on a valid PAGE_SIZE so we round down to the nearest power of 2. 
           * Add 1 so we can then subtract it out in the assignment to maxio.
           * The reason for all these shenanigans is to create a maxio value that
           * creates IO operations to volumes that yield consistent operations
           * with good performance.
           */
                  sg_length = sc->ciss_cfg->max_sg_length - 1;
                  sg_length = (1 << (fls(sg_length) - 1)) + 1;
          }
          cpi->maxio = (min(CISS_MAX_SG_ELEMENTS, sg_length) - 1) * PAGE_SIZE;
          ccb->ccb_h.status = CAM_REQ_CMP;
          break;
      }
  
      case XPT_GET_TRAN_SETTINGS:
      {
          struct ccb_trans_settings       *cts = &ccb->cts;
          int                             bus, target;
          struct ccb_trans_settings_spi *spi = &cts->xport_specific.spi;
          struct ccb_trans_settings_scsi *scsi = &cts->proto_specific.scsi;
  
          bus = cam_sim_bus(sim);
          target = cts->ccb_h.target_id;
  
          debug(1, "XPT_GET_TRAN_SETTINGS %d:%d", bus, target);
          /* disconnect always OK */
          cts->protocol = PROTO_SCSI;
          cts->protocol_version = SCSI_REV_2;
          cts->transport = XPORT_SPI;
          cts->transport_version = 2;
  
          spi->valid = CTS_SPI_VALID_DISC;
          spi->flags = CTS_SPI_FLAGS_DISC_ENB;
  
          scsi->valid = CTS_SCSI_VALID_TQ;
          scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
  
          cts->ccb_h.status = CAM_REQ_CMP;
          break;
      }
  
      default:            /* we can't do this */
          debug(1, "unspported func_code = 0x%x", ccb->ccb_h.func_code);
          ccb->ccb_h.status = CAM_REQ_INVALID;
          break;
      }
  
      xpt_done(ccb);
  }
  
  /************************************************************************
   * Handle a CAM SCSI I/O request.
   */
  static int
  ciss_cam_action_io(struct cam_sim *sim, struct ccb_scsiio *csio)
  {
      struct ciss_softc   *sc;
      int                 bus, target;
      struct ciss_request *cr;
      struct ciss_command *cc;
      int                 error;
  
      sc = cam_sim_softc(sim);
      bus = cam_sim_bus(sim);
      target = csio->ccb_h.target_id;
  
      debug(2, "XPT_SCSI_IO %d:%d:%d", bus, target, csio->ccb_h.target_lun);
  
      /* check that the CDB pointer is not to a physical address */
      if ((csio->ccb_h.flags & CAM_CDB_POINTER) && (csio->ccb_h.flags & CAM_CDB_PHYS)) {
          debug(3, "  CDB pointer is to physical address");
          csio->ccb_h.status = CAM_REQ_CMP_ERR;
      }
  
      /* abandon aborted ccbs or those that have failed validation */
      if ((csio->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
          debug(3, "abandoning CCB due to abort/validation failure");
          return(EINVAL);
      }
  
      /* handle emulation of some SCSI commands ourself */
      if (ciss_cam_emulate(sc, csio))
          return(0);
  
      /*
       * Get a request to manage this command.  If we can't, return the
       * ccb, freeze the queue and flag so that we unfreeze it when a
       * request completes.
       */
      if ((error = ciss_get_request(sc, &cr)) != 0) {
          xpt_freeze_simq(sim, 1);
          sc->ciss_flags |= CISS_FLAG_BUSY;
          csio->ccb_h.status |= CAM_REQUEUE_REQ;
          return(error);
      }
  
      /*
       * Build the command.
       */
      cc = cr->cr_cc;
      cr->cr_data = csio;
      cr->cr_length = csio->dxfer_len;
      cr->cr_complete = ciss_cam_complete;
      cr->cr_private = csio;
  
      /*
       * Target the right logical volume.
       */
      if (CISS_IS_PHYSICAL(bus))
          cc->header.address =
              sc->ciss_physical[CISS_CAM_TO_PBUS(bus)][target].cp_address;
      else
          cc->header.address =
              sc->ciss_logical[bus][target].cl_address;
      cc->cdb.cdb_length = csio->cdb_len;
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;      /* XXX ordered tags? */
      if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) {
          cr->cr_flags = CISS_REQ_DATAOUT | CISS_REQ_CCB;
          cc->cdb.direction = CISS_CDB_DIRECTION_WRITE;
      } else if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
          cr->cr_flags = CISS_REQ_DATAIN | CISS_REQ_CCB;
          cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      } else {
          cr->cr_data = NULL;
          cr->cr_flags = 0;
          cc->cdb.direction = CISS_CDB_DIRECTION_NONE;
      }
      cc->cdb.timeout = (csio->ccb_h.timeout / 1000) + 1;
      if (csio->ccb_h.flags & CAM_CDB_POINTER) {
          bcopy(csio->cdb_io.cdb_ptr, &cc->cdb.cdb[0], csio->cdb_len);
      } else {
          bcopy(csio->cdb_io.cdb_bytes, &cc->cdb.cdb[0], csio->cdb_len);
      }
  
      /*
       * Submit the request to the adapter.
       *
       * Note that this may fail if we're unable to map the request (and
       * if we ever learn a transport layer other than simple, may fail
       * if the adapter rejects the command).
       */
      if ((error = ciss_start(cr)) != 0) {
          xpt_freeze_simq(sim, 1);
          csio->ccb_h.status |= CAM_RELEASE_SIMQ;
          if (error == EINPROGRESS) {
              error = 0;
          } else {
              csio->ccb_h.status |= CAM_REQUEUE_REQ;
              ciss_release_request(cr);
          }
          return(error);
      }
  
      return(0);
  }
  
  /************************************************************************
   * Emulate SCSI commands the adapter doesn't handle as we might like.
   */
  static int
  ciss_cam_emulate(struct ciss_softc *sc, struct ccb_scsiio *csio)
  {
      int         bus, target;
      u_int8_t    opcode;
  
      target = csio->ccb_h.target_id;
      bus = cam_sim_bus(xpt_path_sim(csio->ccb_h.path));
      opcode = (csio->ccb_h.flags & CAM_CDB_POINTER) ?
          *(u_int8_t *)csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes[0];
  
      if (CISS_IS_PHYSICAL(bus)) {
          if (sc->ciss_physical[CISS_CAM_TO_PBUS(bus)][target].cp_online != 1) {
              csio->ccb_h.status |= CAM_SEL_TIMEOUT;
              xpt_done((union ccb *)csio);
              return(1);
          } else
              return(0);
      }
  
      /*
       * Handle requests for volumes that don't exist or are not online.
       * A selection timeout is slightly better than an illegal request.
       * Other errors might be better.
       */
      if (sc->ciss_logical[bus][target].cl_status != CISS_LD_ONLINE) {
          csio->ccb_h.status |= CAM_SEL_TIMEOUT;
          xpt_done((union ccb *)csio);
          return(1);
      }
  
      /* if we have to fake Synchronise Cache */
      if (sc->ciss_flags & CISS_FLAG_FAKE_SYNCH) {
          /*
           * If this is a Synchronise Cache command, typically issued when
           * a device is closed, flush the adapter and complete now.
           */
          if (((csio->ccb_h.flags & CAM_CDB_POINTER) ?
               *(u_int8_t *)csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes[0]) == SYNCHRONIZE_CACHE) {
              ciss_flush_adapter(sc);
              csio->ccb_h.status |= CAM_REQ_CMP;
              xpt_done((union ccb *)csio);
              return(1);
          }
      }
  
      /* 
       * A CISS target can only ever have one lun per target. REPORT_LUNS requires
       * at least one LUN field to be pre created for us, so snag it and fill in
       * the least significant byte indicating 1 LUN here.  Emulate the command
       * return to shut up warning on console of a CDB error.  swb 
       */
      if (opcode == REPORT_LUNS && csio->dxfer_len > 0) {
         csio->data_ptr[3] = 8;
         csio->ccb_h.status |= CAM_REQ_CMP;
         xpt_done((union ccb *)csio);
         return(1);
      }
  
      return(0);
  }
  
  /************************************************************************
   * Check for possibly-completed commands.
   */
  static void
  ciss_cam_poll(struct cam_sim *sim)
  {
      cr_qhead_t qh;
      struct ciss_softc   *sc = cam_sim_softc(sim);
  
      debug_called(2);
  
      STAILQ_INIT(&qh);
      if (sc->ciss_perf)
          ciss_perf_done(sc, &qh);
      else
          ciss_done(sc, &qh);
      ciss_complete(sc, &qh);
  }
  
  /************************************************************************
   * Handle completion of a command - pass results back through the CCB
   */
  static void
  ciss_cam_complete(struct ciss_request *cr)
  {
      struct ciss_softc           *sc;
      struct ciss_command         *cc;
      struct ciss_error_info      *ce;
      struct ccb_scsiio           *csio;
      int                         scsi_status;
      int                         command_status;
  
      debug_called(2);
  
      sc = cr->cr_sc;
      cc = cr->cr_cc;
      ce = (struct ciss_error_info *)&(cc->sg[0]);
      csio = (struct ccb_scsiio *)cr->cr_private;
  
      /*
       * Extract status values from request.
       */
      ciss_report_request(cr, &command_status, &scsi_status);
      switch(command_status) {
      case CISS_CMD_STATUS_DATA_UNDERRUN:
          csio->resid = ce->residual_count;
          /* FALLTHROUGH */
      case CISS_CMD_STATUS_SUCCESS:
          csio->scsi_status = scsi_status;
          debug(2, "SCSI_STATUS_OK");
          csio->ccb_h.status |= CAM_REQ_CMP;
          break;
      case CISS_CMD_STATUS_TARGET_STATUS:
          csio->scsi_status = scsi_status;
          bzero(&csio->sense_data, SSD_FULL_SIZE);
          bcopy(&ce->sense_info[0], &csio->sense_data, ce->sense_length);
          if (csio->sense_len > ce->sense_length)
                  csio->sense_resid = csio->sense_len - ce->sense_length;
          else
                  csio->sense_resid = 0;
          csio->resid = ce->residual_count;
          csio->ccb_h.status |= CAM_SCSI_STATUS_ERROR | CAM_AUTOSNS_VALID;
          break;
      case CISS_CMD_STATUS_DATA_OVERRUN:
          csio->ccb_h.status |= CAM_DATA_RUN_ERR;
          break;
      default:
          csio->ccb_h.status |= CAM_REQ_CMP_ERR;
          break;
      }
  
      /* handle post-command fixup */
      ciss_cam_complete_fixup(sc, csio);
  
      ciss_release_request(cr);
      if (sc->ciss_flags & CISS_FLAG_BUSY) {
          sc->ciss_flags &= ~CISS_FLAG_BUSY;
          if (csio->ccb_h.status & CAM_RELEASE_SIMQ)
              xpt_release_simq(xpt_path_sim(csio->ccb_h.path), 0);
          else
              csio->ccb_h.status |= CAM_RELEASE_SIMQ;
      }
      xpt_done((union ccb *)csio);
  }
  
  /********************************************************************************
   * Fix up the result of some commands here.
   */
  static void
  ciss_cam_complete_fixup(struct ciss_softc *sc, struct ccb_scsiio *csio)
  {
      struct scsi_inquiry_data    *inq;
      struct ciss_ldrive          *cl;
      uint8_t                     *cdb;
      int                         bus, target;
  
      cdb = (csio->ccb_h.flags & CAM_CDB_POINTER) ?
           (uint8_t *)csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes;
      if (cdb[0] == INQUIRY && 
          (cdb[1] & SI_EVPD) == 0 &&
          (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN &&
          csio->dxfer_len >= SHORT_INQUIRY_LENGTH) {
  
          inq = (struct scsi_inquiry_data *)csio->data_ptr;
          target = csio->ccb_h.target_id;
          bus = cam_sim_bus(xpt_path_sim(csio->ccb_h.path));
  
          /*
           * If the controller is in JBOD mode, there are no logical volumes.
           * Let the disks be probed and dealt with via CAM.  Else, mask off 
           * the physical disks and setup the parts of the inq structure for
           * the logical volume.  swb
           */
          if( !(sc->ciss_id->PowerUPNvramFlags & PWR_UP_FLAG_JBOD_ENABLED)){
                  if (CISS_IS_PHYSICAL(bus)) {
                          if (SID_TYPE(inq) == T_DIRECT)
                                  inq->device = (inq->device & 0xe0) | T_NODEVICE;
                          return;
                  }
                  cl = &sc->ciss_logical[bus][target];
  
                  padstr(inq->vendor, "HP",
                          SID_VENDOR_SIZE);
                  padstr(inq->product,
                          ciss_name_ldrive_org(cl->cl_ldrive->fault_tolerance),
                          SID_PRODUCT_SIZE);
                  padstr(inq->revision,
                          ciss_name_ldrive_status(cl->cl_lstatus->status),
                          SID_REVISION_SIZE);
          }
      }
  }
  
  
  /********************************************************************************
   * Name the device at (target)
   *
   * XXX is this strictly correct?
   */
  static int
  ciss_name_device(struct ciss_softc *sc, int bus, int target)
  {
      struct cam_periph   *periph;
      struct cam_path     *path;
      int                 status;
  
      if (CISS_IS_PHYSICAL(bus))
          return (0);
  
      status = xpt_create_path(&path, NULL, cam_sim_path(sc->ciss_cam_sim[bus]),
                               target, 0);
  
      if (status == CAM_REQ_CMP) {
          xpt_path_lock(path);
          periph = cam_periph_find(path, NULL);
          xpt_path_unlock(path);
          xpt_free_path(path);
          if (periph != NULL) {
                  sprintf(sc->ciss_logical[bus][target].cl_name, "%s%d",
                          periph->periph_name, periph->unit_number);
                  return(0);
          }
      }
      sc->ciss_logical[bus][target].cl_name[0] = 0;
      return(ENOENT);
  }
  
  /************************************************************************
   * Periodic status monitoring.
   */
  static void
  ciss_periodic(void *arg)
  {
      struct ciss_softc   *sc;
      struct ciss_request *cr = NULL;
      struct ciss_command *cc = NULL;
      int                 error = 0;
  
      debug_called(1);
  
      sc = (struct ciss_softc *)arg;
  
      /*
       * Check the adapter heartbeat.
       */
      if (sc->ciss_cfg->heartbeat == sc->ciss_heartbeat) {
          sc->ciss_heart_attack++;
          debug(0, "adapter heart attack in progress 0x%x/%d",
                sc->ciss_heartbeat, sc->ciss_heart_attack);
          if (sc->ciss_heart_attack == 3) {
              ciss_printf(sc, "ADAPTER HEARTBEAT FAILED\n");
              ciss_disable_adapter(sc);
              return;
          }
      } else {
          sc->ciss_heartbeat = sc->ciss_cfg->heartbeat;
          sc->ciss_heart_attack = 0;
          debug(3, "new heartbeat 0x%x", sc->ciss_heartbeat);
      }
  
      /*
       * Send the NOP message and wait for a response.
       */
      if (ciss_nop_message_heartbeat != 0 && (error = ciss_get_request(sc, &cr)) == 0) {
          cc = cr->cr_cc;
          cr->cr_complete = ciss_nop_complete;
          cc->cdb.cdb_length = 1;
          cc->cdb.type = CISS_CDB_TYPE_MESSAGE;
          cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
          cc->cdb.direction = CISS_CDB_DIRECTION_WRITE;
          cc->cdb.timeout = 0;
          cc->cdb.cdb[0] = CISS_OPCODE_MESSAGE_NOP;
  
          if ((error = ciss_start(cr)) != 0) {
              ciss_printf(sc, "SENDING NOP MESSAGE FAILED\n");
          }
      }
  
      /*
       * If the notify event request has died for some reason, or has
       * not started yet, restart it.
       */
      if (!(sc->ciss_flags & CISS_FLAG_NOTIFY_OK)) {
          debug(0, "(re)starting Event Notify chain");
          ciss_notify_event(sc);
      }
  
      /*
       * Reschedule.
       */
      callout_reset(&sc->ciss_periodic, CISS_HEARTBEAT_RATE * hz, ciss_periodic, sc);
  }
  
  static void
  ciss_nop_complete(struct ciss_request *cr)
  {
      struct ciss_softc           *sc;
      static int                  first_time = 1;
  
      sc = cr->cr_sc;
      if (ciss_report_request(cr, NULL, NULL) != 0) {
          if (first_time == 1) {
              first_time = 0;
              ciss_printf(sc, "SENDING NOP MESSAGE FAILED (not logging anymore)\n");
          }
      }
  
      ciss_release_request(cr);
  }
  
  /************************************************************************
   * Disable the adapter.
   *
   * The all requests in completed queue is failed with hardware error.
   * This will cause failover in a multipath configuration.
   */
  static void
  ciss_disable_adapter(struct ciss_softc *sc)
  {
      cr_qhead_t                  qh;
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_error_info      *ce;
      int                         i;
  
      CISS_TL_SIMPLE_DISABLE_INTERRUPTS(sc);
      pci_disable_busmaster(sc->ciss_dev);
      sc->ciss_flags &= ~CISS_FLAG_RUNNING;
  
      STAILQ_INIT(&qh);
      for (i = 1; i < sc->ciss_max_requests; i++) {
          cr = &sc->ciss_request[i];
          if ((cr->cr_flags & CISS_REQ_BUSY) == 0)
              continue;
  
          cc = cr->cr_cc;
          ce = (struct ciss_error_info *)&(cc->sg[0]);
          ce->command_status = CISS_CMD_STATUS_HARDWARE_ERROR;
          ciss_enqueue_complete(cr, &qh);
      }
  
      for (;;) {
          if ((cr = ciss_dequeue_complete(sc, &qh)) == NULL)
              break;
      
          /*
           * If the request has a callback, invoke it.
           */
          if (cr->cr_complete != NULL) {
              cr->cr_complete(cr);
              continue;
          }
  
          /*
           * If someone is sleeping on this request, wake them up.
           */
          if (cr->cr_flags & CISS_REQ_SLEEP) {
              cr->cr_flags &= ~CISS_REQ_SLEEP;
              wakeup(cr);
              continue;
          }
      }
  }
  
  /************************************************************************
   * Request a notification response from the adapter.
   *
   * If (cr) is NULL, this is the first request of the adapter, so
   * reset the adapter's message pointer and start with the oldest
   * message available.
   */
  static void
  ciss_notify_event(struct ciss_softc *sc)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_notify_cdb      *cnc;
      int                         error;
  
      debug_called(1);
  
      cr = sc->ciss_periodic_notify;
  
      /* get a request if we don't already have one */
      if (cr == NULL) {
          if ((error = ciss_get_request(sc, &cr)) != 0) {
              debug(0, "can't get notify event request");
              goto out;
          }
          sc->ciss_periodic_notify = cr;
          cr->cr_complete = ciss_notify_complete;
          debug(1, "acquired request %d", cr->cr_tag);
      }
  
      /*
       * Get a databuffer if we don't already have one, note that the
       * adapter command wants a larger buffer than the actual
       * structure.
       */
      if (cr->cr_data == NULL) {
          if ((cr->cr_data = malloc(CISS_NOTIFY_DATA_SIZE, CISS_MALLOC_CLASS, M_NOWAIT)) == NULL) {
              debug(0, "can't get notify event request buffer");
              error = ENOMEM;
              goto out;
          }
          cr->cr_length = CISS_NOTIFY_DATA_SIZE;
      }
  
      /* re-setup the request's command (since we never release it) XXX overkill*/
      ciss_preen_command(cr);
  
      /* (re)build the notify event command */
      cc = cr->cr_cc;
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
  
      cc->cdb.cdb_length = sizeof(*cnc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 0;        /* no timeout, we hope */
  
      cnc = (struct ciss_notify_cdb *)&(cc->cdb.cdb[0]);
      bzero(cr->cr_data, CISS_NOTIFY_DATA_SIZE);
      cnc->opcode = CISS_OPCODE_READ;
      cnc->command = CISS_COMMAND_NOTIFY_ON_EVENT;
      cnc->timeout = 0;           /* no timeout, we hope */
      cnc->synchronous = 0;
      cnc->ordered = 0;
      cnc->seek_to_oldest = 0;
      if ((sc->ciss_flags & CISS_FLAG_RUNNING) == 0)
          cnc->new_only = 1;
      else
          cnc->new_only = 0;
      cnc->length = htonl(CISS_NOTIFY_DATA_SIZE);
  
      /* submit the request */
      error = ciss_start(cr);
  
   out:
      if (error) {
          if (cr != NULL) {
              if (cr->cr_data != NULL)
                  free(cr->cr_data, CISS_MALLOC_CLASS);
              ciss_release_request(cr);
          }
          sc->ciss_periodic_notify = NULL;
          debug(0, "can't submit notify event request");
          sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
      } else {
          debug(1, "notify event submitted");
          sc->ciss_flags |= CISS_FLAG_NOTIFY_OK;
      }
  }
  
  static void
  ciss_notify_complete(struct ciss_request *cr)
  {
      struct ciss_command *cc;
      struct ciss_notify  *cn;
      struct ciss_softc   *sc;
      int                 scsi_status;
      int                 command_status;
      debug_called(1);
  
      cc = cr->cr_cc;
      cn = (struct ciss_notify *)cr->cr_data;
      sc = cr->cr_sc;
  
      /*
       * Report request results, decode status.
       */
      ciss_report_request(cr, &command_status, &scsi_status);
  
      /*
       * Abort the chain on a fatal error.
       *
       * XXX which of these are actually errors?
       */
      if ((command_status != CISS_CMD_STATUS_SUCCESS) &&
          (command_status != CISS_CMD_STATUS_TARGET_STATUS) &&
          (command_status != CISS_CMD_STATUS_TIMEOUT)) {  /* XXX timeout? */
          ciss_printf(sc, "fatal error in Notify Event request (%s)\n",
                      ciss_name_command_status(command_status));
          ciss_release_request(cr);
          sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
          return;
      }
  
      /*
       * If the adapter gave us a text message, print it.
       */
      if (cn->message[0] != 0)
          ciss_printf(sc, "*** %.80s\n", cn->message);
  
      debug(0, "notify event class %d subclass %d detail %d",
                  cn->class, cn->subclass, cn->detail);
  
      /*
       * If the response indicates that the notifier has been aborted,
       * release the notifier command.
       */
      if ((cn->class == CISS_NOTIFY_NOTIFIER) &&
          (cn->subclass == CISS_NOTIFY_NOTIFIER_STATUS) &&
          (cn->detail == 1)) {
          debug(0, "notifier exiting");
          sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
          ciss_release_request(cr);
          sc->ciss_periodic_notify = NULL;
          wakeup(&sc->ciss_periodic_notify);
      } else {
          /* Handle notify events in a kernel thread */
          ciss_enqueue_notify(cr);
          sc->ciss_periodic_notify = NULL;
          wakeup(&sc->ciss_periodic_notify);
          wakeup(&sc->ciss_notify);
      }
      /*
       * Send a new notify event command, if we're not aborting.
       */
      if (!(sc->ciss_flags & CISS_FLAG_ABORTING)) {
          ciss_notify_event(sc);
      }
  }
  
  /************************************************************************
   * Abort the Notify Event chain.
   *
   * Note that we can't just abort the command in progress; we have to
   * explicitly issue an Abort Notify Event command in order for the
   * adapter to clean up correctly.
   *
   * If we are called with CISS_FLAG_ABORTING set in the adapter softc,
   * the chain will not restart itself.
   */
  static int
  ciss_notify_abort(struct ciss_softc *sc)
  {
      struct ciss_request         *cr;
      struct ciss_command         *cc;
      struct ciss_notify_cdb      *cnc;
      int                         error, command_status, scsi_status;
  
      debug_called(1);
  
      cr = NULL;
      error = 0;
  
      /* verify that there's an outstanding command */
      if (!(sc->ciss_flags & CISS_FLAG_NOTIFY_OK))
          goto out;
  
      /* get a command to issue the abort with */
      if ((error = ciss_get_request(sc, &cr)))
          goto out;
  
      /* get a buffer for the result */
      if ((cr->cr_data = malloc(CISS_NOTIFY_DATA_SIZE, CISS_MALLOC_CLASS, M_NOWAIT)) == NULL) {
          debug(0, "can't get notify event request buffer");
          error = ENOMEM;
          goto out;
      }
      cr->cr_length = CISS_NOTIFY_DATA_SIZE;
  
      /* build the CDB */
      cc = cr->cr_cc;
      cc->header.address.physical.mode = CISS_HDR_ADDRESS_MODE_PERIPHERAL;
      cc->header.address.physical.bus = 0;
      cc->header.address.physical.target = 0;
      cc->cdb.cdb_length = sizeof(*cnc);
      cc->cdb.type = CISS_CDB_TYPE_COMMAND;
      cc->cdb.attribute = CISS_CDB_ATTRIBUTE_SIMPLE;
      cc->cdb.direction = CISS_CDB_DIRECTION_READ;
      cc->cdb.timeout = 0;        /* no timeout, we hope */
  
      cnc = (struct ciss_notify_cdb *)&(cc->cdb.cdb[0]);
      bzero(cnc, sizeof(*cnc));
      cnc->opcode = CISS_OPCODE_WRITE;
      cnc->command = CISS_COMMAND_ABORT_NOTIFY;
      cnc->length = htonl(CISS_NOTIFY_DATA_SIZE);
  #if 0
      ciss_print_request(cr);
  #endif
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "Abort Notify Event command failed (%d)\n", error);
          goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, &scsi_status);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
          break;
      case CISS_CMD_STATUS_INVALID_COMMAND:
          /*
           * Some older adapters don't support the CISS version of this
           * command.  Fall back to using the BMIC version.
           */
          error = ciss_notify_abort_bmic(sc);
          if (error != 0)
              goto out;
          break;
  
      case CISS_CMD_STATUS_TARGET_STATUS:
          /*
           * This can happen if the adapter thinks there wasn't an outstanding
           * Notify Event command but we did.  We clean up here.
           */
          if (scsi_status == CISS_SCSI_STATUS_CHECK_CONDITION) {
              if (sc->ciss_periodic_notify != NULL)
                  ciss_release_request(sc->ciss_periodic_notify);
              error = 0;
              goto out;
          }
          /* FALLTHROUGH */
  
      default:
          ciss_printf(sc, "Abort Notify Event command failed (%s)\n",
                      ciss_name_command_status(command_status));
          error = EIO;
          goto out;
      }
  
      /*
       * Sleep waiting for the notifier command to complete.  Note
       * that if it doesn't, we may end up in a bad situation, since
       * the adapter may deliver it later.  Also note that the adapter
       * requires the Notify Event command to be cancelled in order to
       * maintain internal bookkeeping.
       */
      while (sc->ciss_periodic_notify != NULL) {
          error = msleep(&sc->ciss_periodic_notify, &sc->ciss_mtx, PRIBIO, "cissNEA", hz * 5);
          if (error == EWOULDBLOCK) {
              ciss_printf(sc, "Notify Event command failed to abort, adapter may wedge.\n");
              break;
          }
      }
  
   out:
      /* release the cancel request */
      if (cr != NULL) {
          if (cr->cr_data != NULL)
              free(cr->cr_data, CISS_MALLOC_CLASS);
          ciss_release_request(cr);
      }
      if (error == 0)
          sc->ciss_flags &= ~CISS_FLAG_NOTIFY_OK;
      return(error);
  }
  
  /************************************************************************
   * Abort the Notify Event chain using a BMIC command.
   */
  static int
  ciss_notify_abort_bmic(struct ciss_softc *sc)
  {
      struct ciss_request                 *cr;
      int                                 error, command_status;
  
      debug_called(1);
  
      cr = NULL;
      error = 0;
  
      /* verify that there's an outstanding command */
      if (!(sc->ciss_flags & CISS_FLAG_NOTIFY_OK))
          goto out;
  
      /*
       * Build a BMIC command to cancel the Notify on Event command.
       *
       * Note that we are sending a CISS opcode here.  Odd.
       */
      if ((error = ciss_get_bmic_request(sc, &cr, CISS_COMMAND_ABORT_NOTIFY,
                                         NULL, 0)) != 0)
          goto out;
  
      /*
       * Submit the request and wait for it to complete.
       */
      if ((error = ciss_synch_request(cr, 60 * 1000)) != 0) {
          ciss_printf(sc, "error sending BMIC Cancel Notify on Event command (%d)\n", error);
          goto out;
      }
  
      /*
       * Check response.
       */
      ciss_report_request(cr, &command_status, NULL);
      switch(command_status) {
      case CISS_CMD_STATUS_SUCCESS:
          break;
      default:
          ciss_printf(sc, "error cancelling Notify on Event (%s)\n",
                      ciss_name_command_status(command_status));
          error = EIO;
          goto out;
      }
  
  out:
      if (cr != NULL)
          ciss_release_request(cr);
      return(error);
  }
  
  /************************************************************************
   * Handle rescanning all the logical volumes when a notify event
   * causes the drives to come online or offline.
   */
  static void
  ciss_notify_rescan_logical(struct ciss_softc *sc)
  {
      struct ciss_lun_report      *cll;
      struct ciss_ldrive          *ld;
      int                         i, j, ndrives;
  
      /*
       * We must rescan all logical volumes to get the right logical
       * drive address.
       */
      cll = ciss_report_luns(sc, CISS_OPCODE_REPORT_LOGICAL_LUNS,
                             sc->ciss_cfg->max_logical_supported);
      if (cll == NULL)
          return;
  
      ndrives = (ntohl(cll->list_size) / sizeof(union ciss_device_address));
  
      /*
       * Delete any of the drives which were destroyed by the
       * firmware.
       */
      for (i = 0; i < sc->ciss_max_logical_bus; i++) {
          for (j = 0; j < sc->ciss_cfg->max_logical_supported; j++) {
              ld = &sc->ciss_logical[i][j];
  
              if (ld->cl_update == 0)
                  continue;
  
              if (ld->cl_status != CISS_LD_ONLINE) {
                  ciss_cam_rescan_target(sc, i, j);
                  ld->cl_update = 0;
                  if (ld->cl_ldrive)
                      free(ld->cl_ldrive, CISS_MALLOC_CLASS);
                  if (ld->cl_lstatus)
                      free(ld->cl_lstatus, CISS_MALLOC_CLASS);
  
                  ld->cl_ldrive = NULL;
                  ld->cl_lstatus = NULL;
              }
          }
      }
  
      /*
       * Scan for new drives.
       */
      for (i = 0; i < ndrives; i++) {
          int     bus, target;
  
          bus     = CISS_LUN_TO_BUS(cll->lun[i].logical.lun);
          target  = CISS_LUN_TO_TARGET(cll->lun[i].logical.lun);
          ld      = &sc->ciss_logical[bus][target];
  
          if (ld->cl_update == 0)
                  continue;
  
          ld->cl_update           = 0;
          ld->cl_address          = cll->lun[i];
          ld->cl_controller       = &sc->ciss_controllers[bus];
          if (ciss_identify_logical(sc, ld) == 0) {
              ciss_cam_rescan_target(sc, bus, target);
          }
      }
      free(cll, CISS_MALLOC_CLASS);
  }
  
  /************************************************************************
   * Handle a notify event relating to the status of a logical drive.
   *
   * XXX need to be able to defer some of these to properly handle
   *     calling the "ID Physical drive" command, unless the 'extended'
   *     drive IDs are always in BIG_MAP format.
   */
  static void
  ciss_notify_logical(struct ciss_softc *sc, struct ciss_notify *cn)
  {
      struct ciss_ldrive  *ld;
      int                 ostatus, bus, target;
  
      debug_called(2);
  
      bus         = cn->device.physical.bus;
      target      = cn->data.logical_status.logical_drive;
      ld          = &sc->ciss_logical[bus][target];
  
      switch (cn->subclass) {
      case CISS_NOTIFY_LOGICAL_STATUS:
          switch (cn->detail) {
          case 0:
              ciss_name_device(sc, bus, target);
              ciss_printf(sc, "logical drive %d (%s) changed status %s->%s, spare status 0x%b\n",
                          cn->data.logical_status.logical_drive, ld->cl_name,
                          ciss_name_ldrive_status(cn->data.logical_status.previous_state),
                          ciss_name_ldrive_status(cn->data.logical_status.new_state),
                          cn->data.logical_status.spare_state,
                          "\2\1configured\2rebuilding\3failed\4in use\5available\n");
  
              /*
               * Update our idea of the drive's status.
               */
              ostatus = ciss_decode_ldrive_status(cn->data.logical_status.previous_state);
              ld->cl_status = ciss_decode_ldrive_status(cn->data.logical_status.new_state);
              if (ld->cl_lstatus != NULL)
                  ld->cl_lstatus->status = cn->data.logical_status.new_state;
  
              /*
               * Have CAM rescan the drive if its status has changed.
               */
              if (ostatus != ld->cl_status) {
                  ld->cl_update = 1;
                  ciss_notify_rescan_logical(sc);
              }
  
              break;
  
          case 1: /* logical drive has recognised new media, needs Accept Media Exchange */
              ciss_name_device(sc, bus, target);
              ciss_printf(sc, "logical drive %d (%s) media exchanged, ready to go online\n",
                          cn->data.logical_status.logical_drive, ld->cl_name);
              ciss_accept_media(sc, ld);
  
              ld->cl_update = 1;
              ld->cl_status = ciss_decode_ldrive_status(cn->data.logical_status.new_state);
              ciss_notify_rescan_logical(sc);
              break;
  
          case 2:
          case 3:
              ciss_printf(sc, "rebuild of logical drive %d (%s) failed due to %s error\n",
                          cn->data.rebuild_aborted.logical_drive,
                          ld->cl_name,
                          (cn->detail == 2) ? "read" : "write");
              break;
          }
          break;
  
      case CISS_NOTIFY_LOGICAL_ERROR:
          if (cn->detail == 0) {
              ciss_printf(sc, "FATAL I/O ERROR on logical drive %d (%s), SCSI port %d ID %d\n",
                          cn->data.io_error.logical_drive,
                          ld->cl_name,
                          cn->data.io_error.failure_bus,
                          cn->data.io_error.failure_drive);
              /* XXX should we take the drive down at this point, or will we be told? */
          }
          break;
  
      case CISS_NOTIFY_LOGICAL_SURFACE:
          if (cn->detail == 0)
              ciss_printf(sc, "logical drive %d (%s) completed consistency initialisation\n",
                          cn->data.consistency_completed.logical_drive,
                          ld->cl_name);
          break;
      }
  }
  
  /************************************************************************
   * Handle a notify event relating to the status of a physical drive.
   */
  static void
  ciss_notify_physical(struct ciss_softc *sc, struct ciss_notify *cn)
  {
  }
  
  /************************************************************************
   * Handle a notify event relating to the status of a physical drive.
   */
  static void
  ciss_notify_hotplug(struct ciss_softc *sc, struct ciss_notify *cn)
  {
      struct ciss_lun_report *cll = NULL;
      int bus, target;
  
      switch (cn->subclass) {
      case CISS_NOTIFY_HOTPLUG_PHYSICAL:
      case CISS_NOTIFY_HOTPLUG_NONDISK:
          bus = CISS_BIG_MAP_BUS(sc, cn->data.drive.big_physical_drive_number);
          target =
              CISS_BIG_MAP_TARGET(sc, cn->data.drive.big_physical_drive_number);
  
          if (cn->detail == 0) {
              /*
               * Mark the device offline so that it'll start producing selection
               * timeouts to the upper layer.
               */
              if ((bus >= 0) && (target >= 0))
                  sc->ciss_physical[bus][target].cp_online = 0;
          } else {
              /*
               * Rescan the physical lun list for new items
               */
              cll = ciss_report_luns(sc, CISS_OPCODE_REPORT_PHYSICAL_LUNS,
                                     sc->ciss_cfg->max_physical_supported);
              if (cll == NULL) {
                  ciss_printf(sc, "Warning, cannot get physical lun list\n");
                  break;
              }
              ciss_filter_physical(sc, cll);
          }
          break;
  
      default:
          ciss_printf(sc, "Unknown hotplug event %d\n", cn->subclass);
          return;
      }
  
      if (cll != NULL)
          free(cll, CISS_MALLOC_CLASS);
  }
  
  /************************************************************************
   * Handle deferred processing of notify events.  Notify events may need
   * sleep which is unsafe during an interrupt.
   */
  static void
  ciss_notify_thread(void *arg)
  {
      struct ciss_softc           *sc;
      struct ciss_request         *cr;
      struct ciss_notify          *cn;
  
      sc = (struct ciss_softc *)arg;
      mtx_lock(&sc->ciss_mtx);
  
      for (;;) {
          if (STAILQ_EMPTY(&sc->ciss_notify) != 0 &&
              (sc->ciss_flags & CISS_FLAG_THREAD_SHUT) == 0) {
              msleep(&sc->ciss_notify, &sc->ciss_mtx, PUSER, "idle", 0);
          }
  
          if (sc->ciss_flags & CISS_FLAG_THREAD_SHUT)
              break;
  
          cr = ciss_dequeue_notify(sc);
  
          if (cr == NULL)
                  panic("cr null");
          cn = (struct ciss_notify *)cr->cr_data;
  
          switch (cn->class) {
          case CISS_NOTIFY_HOTPLUG:
              ciss_notify_hotplug(sc, cn);
              break;
          case CISS_NOTIFY_LOGICAL:
              ciss_notify_logical(sc, cn);
              break;
          case CISS_NOTIFY_PHYSICAL:
              ciss_notify_physical(sc, cn);
              break;
          }
  
          ciss_release_request(cr);
  
      }
      sc->ciss_notify_thread = NULL;
      wakeup(&sc->ciss_notify_thread);
  
      mtx_unlock(&sc->ciss_mtx);
      kproc_exit(0);
  }
  
  /************************************************************************
   * Start the notification kernel thread.
   */
  static void
  ciss_spawn_notify_thread(struct ciss_softc *sc)
  {
  
      if (kproc_create((void(*)(void *))ciss_notify_thread, sc,
                         &sc->ciss_notify_thread, 0, 0, "ciss_notify%d",
                         device_get_unit(sc->ciss_dev)))
          panic("Could not create notify thread\n");
  }
  
  /************************************************************************
   * Kill the notification kernel thread.
   */
  static void
  ciss_kill_notify_thread(struct ciss_softc *sc)
  {
  
      if (sc->ciss_notify_thread == NULL)
          return;
  
      sc->ciss_flags |= CISS_FLAG_THREAD_SHUT;
      wakeup(&sc->ciss_notify);
      msleep(&sc->ciss_notify_thread, &sc->ciss_mtx, PUSER, "thtrm", 0);
  }
  
  /************************************************************************
   * Print a request.
   */
  #ifdef DDB
  static void
  ciss_print_request(struct ciss_request *cr)
  {
      struct ciss_softc   *sc;
      struct ciss_command *cc;
      int                 i;
  
      sc = cr->cr_sc;
      cc = cr->cr_cc;
  
      ciss_printf(sc, "REQUEST @ %p\n", cr);
      ciss_printf(sc, "  data %p/%d  tag %d  flags %b\n",
                cr->cr_data, cr->cr_length, cr->cr_tag, cr->cr_flags,
                "\2\1mapped\2sleep\3poll\4dataout\5datain\n");
      ciss_printf(sc, "  sg list/total %d/%d  host tag 0x%x\n",
                  cc->header.sg_in_list, cc->header.sg_total, cc->header.host_tag);
      switch(cc->header.address.mode.mode) {
      case CISS_HDR_ADDRESS_MODE_PERIPHERAL:
      case CISS_HDR_ADDRESS_MODE_MASK_PERIPHERAL:
          ciss_printf(sc, "  physical bus %d target %d\n",
                      cc->header.address.physical.bus, cc->header.address.physical.target);
          break;
      case CISS_HDR_ADDRESS_MODE_LOGICAL:
          ciss_printf(sc, "  logical unit %d\n", cc->header.address.logical.lun);
          break;
      }
      ciss_printf(sc, "  %s cdb length %d type %s attribute %s\n",
                  (cc->cdb.direction == CISS_CDB_DIRECTION_NONE) ? "no-I/O" :
                  (cc->cdb.direction == CISS_CDB_DIRECTION_READ) ? "READ" :
                  (cc->cdb.direction == CISS_CDB_DIRECTION_WRITE) ? "WRITE" : "??",
                  cc->cdb.cdb_length,
                  (cc->cdb.type == CISS_CDB_TYPE_COMMAND) ? "command" :
                  (cc->cdb.type == CISS_CDB_TYPE_MESSAGE) ? "message" : "??",
                  (cc->cdb.attribute == CISS_CDB_ATTRIBUTE_UNTAGGED) ? "untagged" :
                  (cc->cdb.attribute == CISS_CDB_ATTRIBUTE_SIMPLE) ? "simple" :
                  (cc->cdb.attribute == CISS_CDB_ATTRIBUTE_HEAD_OF_QUEUE) ? "head-of-queue" :
                  (cc->cdb.attribute == CISS_CDB_ATTRIBUTE_ORDERED) ? "ordered" :
                  (cc->cdb.attribute == CISS_CDB_ATTRIBUTE_AUTO_CONTINGENT) ? "auto-contingent" : "??");
      ciss_printf(sc, "  %*D\n", cc->cdb.cdb_length, &cc->cdb.cdb[0], " ");
  
      if (cc->header.host_tag & CISS_HDR_HOST_TAG_ERROR) {
          /* XXX print error info */
      } else {
          /* since we don't use chained s/g, don't support it here */
          for (i = 0; i < cc->header.sg_in_list; i++) {
              if ((i % 4) == 0)
                  ciss_printf(sc, "   ");
              printf("0x%08x/%d ", (u_int32_t)cc->sg[i].address, cc->sg[i].length);
              if ((((i + 1) % 4) == 0) || (i == (cc->header.sg_in_list - 1)))
                  printf("\n");
          }
      }
  }
  #endif
  
  /************************************************************************
   * Print information about the status of a logical drive.
   */
  static void
  ciss_print_ldrive(struct ciss_softc *sc, struct ciss_ldrive *ld)
  {
      int         bus, target, i;
  
      if (ld->cl_lstatus == NULL) {
          printf("does not exist\n");
          return;
      }
  
      /* print drive status */
      switch(ld->cl_lstatus->status) {
      case CISS_LSTATUS_OK:
          printf("online\n");
          break;
      case CISS_LSTATUS_INTERIM_RECOVERY:
          printf("in interim recovery mode\n");
          break;
      case CISS_LSTATUS_READY_RECOVERY:
          printf("ready to begin recovery\n");
          break;
      case CISS_LSTATUS_RECOVERING:
          bus = CISS_BIG_MAP_BUS(sc, ld->cl_lstatus->drive_rebuilding);
          target = CISS_BIG_MAP_BUS(sc, ld->cl_lstatus->drive_rebuilding);
          printf("being recovered, working on physical drive %d.%d, %u blocks remaining\n",
                 bus, target, ld->cl_lstatus->blocks_to_recover);
          break;
      case CISS_LSTATUS_EXPANDING:
          printf("being expanded, %u blocks remaining\n",
                 ld->cl_lstatus->blocks_to_recover);
          break;
      case CISS_LSTATUS_QUEUED_FOR_EXPANSION:
          printf("queued for expansion\n");
          break;
      case CISS_LSTATUS_FAILED:
          printf("queued for expansion\n");
          break;
      case CISS_LSTATUS_WRONG_PDRIVE:
          printf("wrong physical drive inserted\n");
          break;
      case CISS_LSTATUS_MISSING_PDRIVE:
          printf("missing a needed physical drive\n");
          break;
      case CISS_LSTATUS_BECOMING_READY:
          printf("becoming ready\n");
          break;
      }
  
      /* print failed physical drives */
      for (i = 0; i < CISS_BIG_MAP_ENTRIES / 8; i++) {
          bus = CISS_BIG_MAP_BUS(sc, ld->cl_lstatus->drive_failure_map[i]);
          target = CISS_BIG_MAP_TARGET(sc, ld->cl_lstatus->drive_failure_map[i]);
          if (bus == -1)
              continue;
          ciss_printf(sc, "physical drive %d:%d (%x) failed\n", bus, target,
                      ld->cl_lstatus->drive_failure_map[i]);
      }
  }
  
  #ifdef DDB
  #include <ddb/ddb.h>
  /************************************************************************
   * Print information about the controller/driver.
   */
  static void
  ciss_print_adapter(struct ciss_softc *sc)
  {
      int         i, j;
  
      ciss_printf(sc, "ADAPTER:\n");
      for (i = 0; i < CISSQ_COUNT; i++) {
          ciss_printf(sc, "%s     %d/%d\n",
              i == 0 ? "free" :
              i == 1 ? "busy" : "complete",
              sc->ciss_qstat[i].q_length,
              sc->ciss_qstat[i].q_max);
      }
      ciss_printf(sc, "max_requests %d\n", sc->ciss_max_requests);
      ciss_printf(sc, "flags %b\n", sc->ciss_flags,
          "\2\1notify_ok\2control_open\3aborting\4running\21fake_synch\22bmic_abort\n");
  
      for (i = 0; i < sc->ciss_max_logical_bus; i++) {
          for (j = 0; j < sc->ciss_cfg->max_logical_supported; j++) {
              ciss_printf(sc, "LOGICAL DRIVE %d:  ", i);
              ciss_print_ldrive(sc, &sc->ciss_logical[i][j]);
          }
      }
  
      /* XXX Should physical drives be printed out here? */
  
      for (i = 1; i < sc->ciss_max_requests; i++)
          ciss_print_request(sc->ciss_request + i);
  }
  
  /* DDB hook */
  DB_COMMAND(ciss_prt, db_ciss_prt)
  {
      struct ciss_softc   *sc;
      devclass_t dc;
      int maxciss, i;
  
      dc = devclass_find("ciss");
      if ( dc == NULL ) {
          printf("%s: can't find devclass!\n", __func__);
          return;
      }
      maxciss = devclass_get_maxunit(dc);
      for (i = 0; i < maxciss; i++) {
          sc = devclass_get_softc(dc, i);
          ciss_print_adapter(sc);
      }
  }
  #endif
  
  /************************************************************************
   * Return a name for a logical drive status value.
   */
  static const char *
  ciss_name_ldrive_status(int status)
  {
      switch (status) {
      case CISS_LSTATUS_OK:
          return("OK");
      case CISS_LSTATUS_FAILED:
          return("failed");
      case CISS_LSTATUS_NOT_CONFIGURED:
          return("not configured");
      case CISS_LSTATUS_INTERIM_RECOVERY:
          return("interim recovery");
      case CISS_LSTATUS_READY_RECOVERY:
          return("ready for recovery");
      case CISS_LSTATUS_RECOVERING:
          return("recovering");
      case CISS_LSTATUS_WRONG_PDRIVE:
          return("wrong physical drive inserted");
      case CISS_LSTATUS_MISSING_PDRIVE:
          return("missing physical drive");
      case CISS_LSTATUS_EXPANDING:
          return("expanding");
      case CISS_LSTATUS_BECOMING_READY:
          return("becoming ready");
      case CISS_LSTATUS_QUEUED_FOR_EXPANSION:
          return("queued for expansion");
      }
      return("unknown status");
  }
  
  /************************************************************************
   * Return an online/offline/nonexistent value for a logical drive
   * status value.
   */
  static int
  ciss_decode_ldrive_status(int status)
  {
      switch(status) {
      case CISS_LSTATUS_NOT_CONFIGURED:
          return(CISS_LD_NONEXISTENT);
  
      case CISS_LSTATUS_OK:
      case CISS_LSTATUS_INTERIM_RECOVERY:
      case CISS_LSTATUS_READY_RECOVERY:
      case CISS_LSTATUS_RECOVERING:
      case CISS_LSTATUS_EXPANDING:
      case CISS_LSTATUS_QUEUED_FOR_EXPANSION:
          return(CISS_LD_ONLINE);
  
      case CISS_LSTATUS_FAILED:
      case CISS_LSTATUS_WRONG_PDRIVE:
      case CISS_LSTATUS_MISSING_PDRIVE:
      case CISS_LSTATUS_BECOMING_READY:
      default:
          return(CISS_LD_OFFLINE);
      }
  }
  
  
  /************************************************************************
   * Return a name for a logical drive's organisation.
   */
  static const char *
  ciss_name_ldrive_org(int org)
  {
      switch(org) {
      case CISS_LDRIVE_RAID0:
          return("RAID 0");
      case CISS_LDRIVE_RAID1:
          return("RAID 1(1+0)");
      case CISS_LDRIVE_RAID4:
          return("RAID 4");
      case CISS_LDRIVE_RAID5:
          return("RAID 5");
      case CISS_LDRIVE_RAID51:
          return("RAID 5+1");
      case CISS_LDRIVE_RAIDADG:
          return("RAID ADG");
      }
      return("unknown");
  }
  
  /************************************************************************
   * Return a name for a command status value.
   */
  static const char *
  ciss_name_command_status(int status)
  {
      switch(status) {
      case CISS_CMD_STATUS_SUCCESS:
          return("success");
      case CISS_CMD_STATUS_TARGET_STATUS:
          return("target status");
      case CISS_CMD_STATUS_DATA_UNDERRUN:
          return("data underrun");
      case CISS_CMD_STATUS_DATA_OVERRUN:
          return("data overrun");
      case CISS_CMD_STATUS_INVALID_COMMAND:
          return("invalid command");
      case CISS_CMD_STATUS_PROTOCOL_ERROR:
          return("protocol error");
      case CISS_CMD_STATUS_HARDWARE_ERROR:
          return("hardware error");
      case CISS_CMD_STATUS_CONNECTION_LOST:
          return("connection lost");
      case CISS_CMD_STATUS_ABORTED:
          return("aborted");
      case CISS_CMD_STATUS_ABORT_FAILED:
          return("abort failed");
      case CISS_CMD_STATUS_UNSOLICITED_ABORT:
          return("unsolicited abort");
      case CISS_CMD_STATUS_TIMEOUT:
          return("timeout");
      case CISS_CMD_STATUS_UNABORTABLE:
          return("unabortable");
      }
      return("unknown status");
  }
  
  /************************************************************************
   * Handle an open on the control device.
   */
  static int
  ciss_open(struct cdev *dev, int flags, int fmt, struct thread *p)
  {
      struct ciss_softc   *sc;
  
      debug_called(1);
  
      sc = (struct ciss_softc *)dev->si_drv1;
  
      /* we might want to veto if someone already has us open */
  
      mtx_lock(&sc->ciss_mtx);
      sc->ciss_flags |= CISS_FLAG_CONTROL_OPEN;
      mtx_unlock(&sc->ciss_mtx);
      return(0);
  }
  
  /************************************************************************
   * Handle the last close on the control device.
   */
  static int
  ciss_close(struct cdev *dev, int flags, int fmt, struct thread *p)
  {
      struct ciss_softc   *sc;
  
      debug_called(1);
  
      sc = (struct ciss_softc *)dev->si_drv1;
  
      mtx_lock(&sc->ciss_mtx);
      sc->ciss_flags &= ~CISS_FLAG_CONTROL_OPEN;
      mtx_unlock(&sc->ciss_mtx);
      return (0);
  }
  
  /********************************************************************************
   * Handle adapter-specific control operations.
   *
   * Note that the API here is compatible with the Linux driver, in order to
   * simplify the porting of Compaq's userland tools.
   */
  static int
  ciss_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int32_t flag, struct thread *p)
  {
      struct ciss_softc           *sc;
      IOCTL_Command_struct        *ioc    = (IOCTL_Command_struct *)addr;
  #ifdef __amd64__
      IOCTL_Command_struct32      *ioc32  = (IOCTL_Command_struct32 *)addr;
      IOCTL_Command_struct        ioc_swab;
  #endif
      int                         error;
  
      debug_called(1);
  
      sc = (struct ciss_softc *)dev->si_drv1;
      error = 0;
      mtx_lock(&sc->ciss_mtx);
  
      switch(cmd) {
      case CCISS_GETQSTATS:
      {
          union ciss_statrequest *cr = (union ciss_statrequest *)addr;
  
          switch (cr->cs_item) {
          case CISSQ_FREE:
          case CISSQ_NOTIFY:
              bcopy(&sc->ciss_qstat[cr->cs_item], &cr->cs_qstat,
                  sizeof(struct ciss_qstat));
              break;
          default:
              error = ENOIOCTL;
              break;
          }
  
          break;
      }
  
      case CCISS_GETPCIINFO:
      {
          cciss_pci_info_struct   *pis = (cciss_pci_info_struct *)addr;
  
          pis->bus = pci_get_bus(sc->ciss_dev);
          pis->dev_fn = pci_get_slot(sc->ciss_dev);
          pis->board_id = (pci_get_subvendor(sc->ciss_dev) << 16) |
                  pci_get_subdevice(sc->ciss_dev);
  
          break;
      }
  
      case CCISS_GETINTINFO:
      {
          cciss_coalint_struct    *cis = (cciss_coalint_struct *)addr;
  
          cis->delay = sc->ciss_cfg->interrupt_coalesce_delay;
          cis->count = sc->ciss_cfg->interrupt_coalesce_count;
  
          break;
      }
  
      case CCISS_SETINTINFO:
      {
          cciss_coalint_struct    *cis = (cciss_coalint_struct *)addr;
  
          if ((cis->delay == 0) && (cis->count == 0)) {
              error = EINVAL;
              break;
          }
  
          /*
           * XXX apparently this is only safe if the controller is idle,
           *     we should suspend it before doing this.
           */
          sc->ciss_cfg->interrupt_coalesce_delay = cis->delay;
          sc->ciss_cfg->interrupt_coalesce_count = cis->count;
  
          if (ciss_update_config(sc))
              error = EIO;
  
          /* XXX resume the controller here */
          break;
      }
  
      case CCISS_GETNODENAME:
          bcopy(sc->ciss_cfg->server_name, (NodeName_type *)addr,
                sizeof(NodeName_type));
          break;
  
      case CCISS_SETNODENAME:
          bcopy((NodeName_type *)addr, sc->ciss_cfg->server_name,
                sizeof(NodeName_type));
          if (ciss_update_config(sc))
              error = EIO;
          break;
  
      case CCISS_GETHEARTBEAT:
          *(Heartbeat_type *)addr = sc->ciss_cfg->heartbeat;
          break;
  
      case CCISS_GETBUSTYPES:
          *(BusTypes_type *)addr = sc->ciss_cfg->bus_types;
          break;
  
      case CCISS_GETFIRMVER:
          bcopy(sc->ciss_id->running_firmware_revision, (FirmwareVer_type *)addr,
                sizeof(FirmwareVer_type));
          break;
  
      case CCISS_GETDRIVERVER:
          *(DriverVer_type *)addr = CISS_DRIVER_VERSION;
          break;
  
      case CCISS_REVALIDVOLS:
          /*
           * This is a bit ugly; to do it "right" we really need
           * to find any disks that have changed, kick CAM off them,
           * then rescan only these disks.  It'd be nice if they
           * a) told us which disk(s) they were going to play with,
           * and b) which ones had arrived. 8(
           */
          break;
  
  #ifdef __amd64__
      case CCISS_PASSTHRU32:
          ioc_swab.LUN_info       = ioc32->LUN_info;
          ioc_swab.Request        = ioc32->Request;
          ioc_swab.error_info     = ioc32->error_info;
          ioc_swab.buf_size       = ioc32->buf_size;
          ioc_swab.buf            = (u_int8_t *)(uintptr_t)ioc32->buf;
          ioc                     = &ioc_swab;
          /* FALLTHROUGH */
  #endif
  
      case CCISS_PASSTHRU:
          error = ciss_user_command(sc, ioc);
          break;
  
      default:
          debug(0, "unknown ioctl 0x%lx", cmd);
  
          debug(1, "CCISS_GETPCIINFO:   0x%lx", CCISS_GETPCIINFO);
          debug(1, "CCISS_GETINTINFO:   0x%lx", CCISS_GETINTINFO);
          debug(1, "CCISS_SETINTINFO:   0x%lx", CCISS_SETINTINFO);
          debug(1, "CCISS_GETNODENAME:  0x%lx", CCISS_GETNODENAME);
          debug(1, "CCISS_SETNODENAME:  0x%lx", CCISS_SETNODENAME);
          debug(1, "CCISS_GETHEARTBEAT: 0x%lx", CCISS_GETHEARTBEAT);
          debug(1, "CCISS_GETBUSTYPES:  0x%lx", CCISS_GETBUSTYPES);
          debug(1, "CCISS_GETFIRMVER:   0x%lx", CCISS_GETFIRMVER);
          debug(1, "CCISS_GETDRIVERVER: 0x%lx", CCISS_GETDRIVERVER);
          debug(1, "CCISS_REVALIDVOLS:  0x%lx", CCISS_REVALIDVOLS);
          debug(1, "CCISS_PASSTHRU:     0x%lx", CCISS_PASSTHRU);
  
          error = ENOIOCTL;
          break;
      }
  
      mtx_unlock(&sc->ciss_mtx);
      return(error);
  }