FreeBSD/Linux Kernel Cross Reference
sys/dev/raid/amr/amr.c

     /*-
      * Copyright (c) 1999,2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * Copyright (c) 2005 Scott Long
      * 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.
     */
    /*-
     * Copyright (c) 2002 Eric Moore
     * Copyright (c) 2002, 2004 LSI Logic Corporation
     * 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.
     * 3. The party using or redistributing the source code and binary forms
     *    agrees to the disclaimer below and the terms and conditions set forth
     *    herein.
     *
     * 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: src/sys/dev/amr/amr.c,v 1.99 2012/08/31 09:42:46 scottl Exp $
     */
    
    /*
     * Driver for the AMI MegaRaid family of controllers.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/sysctl.h>
    #include <sys/sysmsg.h>
    
    #include <sys/bio.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/stat.h>
    
    #include <machine/cpu.h>
    #include <sys/rman.h>
    
    #include <bus/pci/pcireg.h>
    #include <bus/pci/pcivar.h>
    
    #include <dev/raid/amr/amrio.h>
    #include <dev/raid/amr/amrreg.h>
    #include <dev/raid/amr/amrvar.h>
    #define AMR_DEFINE_TABLES
    #include <dev/raid/amr/amr_tables.h>
    
    SYSCTL_NODE(_hw, OID_AUTO, amr, CTLFLAG_RD, 0, "AMR driver parameters");
    
    static d_open_t         amr_open;
    static d_close_t        amr_close;
    static d_ioctl_t        amr_ioctl;
    
    static struct dev_ops amr_ops = {
            { "amr", 0, 0 },
            .d_open =       amr_open,
            .d_close =      amr_close,
            .d_ioctl =      amr_ioctl,
   };
   
   int linux_no_adapter = 0;
   /*
    * Initialisation, bus interface.
    */
   static void     amr_startup(void *arg);
   
   /*
    * Command wrappers
    */
   static int      amr_query_controller(struct amr_softc *sc);
   static void     *amr_enquiry(struct amr_softc *sc, size_t bufsize, 
                                u_int8_t cmd, u_int8_t cmdsub, u_int8_t cmdqual, int *status);
   static void     amr_completeio(struct amr_command *ac);
   static int      amr_support_ext_cdb(struct amr_softc *sc);
   
   /*
    * Command buffer allocation.
    */
   static void     amr_alloccmd_cluster(struct amr_softc *sc);
   static void     amr_freecmd_cluster(struct amr_command_cluster *acc);
   
   /*
    * Command processing.
    */
   static int      amr_bio_command(struct amr_softc *sc, struct amr_command **acp);
   static int      amr_wait_command(struct amr_command *ac);
   static int      amr_mapcmd(struct amr_command *ac);
   static void     amr_unmapcmd(struct amr_command *ac);
   static int      amr_start(struct amr_command *ac);
   static void     amr_complete(void *context, ac_qhead_t *head);
   static void     amr_setup_sg(void *arg, bus_dma_segment_t *segs, int nsegments, int error);
   static void     amr_setup_data(void *arg, bus_dma_segment_t *segs, int nsegments, int error);
   static void     amr_setup_ccb(void *arg, bus_dma_segment_t *segs, int nsegments, int error);
   static void     amr_abort_load(struct amr_command *ac);
   
   /*
    * Interface-specific shims
    */
   static int      amr_quartz_submit_command(struct amr_command *ac);
   static int      amr_quartz_get_work(struct amr_softc *sc, struct amr_mailbox *mbsave);
   static int      amr_quartz_poll_command(struct amr_command *ac);
   static int      amr_quartz_poll_command1(struct amr_softc *sc, struct amr_command *ac);
   
   static int      amr_std_submit_command(struct amr_command *ac);
   static int      amr_std_get_work(struct amr_softc *sc, struct amr_mailbox *mbsave);
   static int      amr_std_poll_command(struct amr_command *ac);
   static void     amr_std_attach_mailbox(struct amr_softc *sc);
   
   #ifdef AMR_BOARD_INIT
   static int      amr_quartz_init(struct amr_softc *sc);
   static int      amr_std_init(struct amr_softc *sc);
   #endif
   
   /*
    * Debugging
    */
   static void     amr_describe_controller(struct amr_softc *sc);
   #ifdef AMR_DEBUG
   #if 0
   static void     amr_printcommand(struct amr_command *ac);
   #endif
   #endif
   
   static void     amr_init_sysctl(struct amr_softc *sc);
   static int      amr_linux_ioctl_int(struct cdev *dev, u_long cmd, caddr_t addr,
                       int32_t flag, struct sysmsg *sm);
   
   static MALLOC_DEFINE(M_AMR, "amr", "AMR memory");
   
   /********************************************************************************
    ********************************************************************************
                                                                         Inline Glue
    ********************************************************************************
    ********************************************************************************/
   
   /********************************************************************************
    ********************************************************************************
                                                                   Public Interfaces
    ********************************************************************************
    ********************************************************************************/
   
   /********************************************************************************
    * Initialise the controller and softc.
    */
   int
   amr_attach(struct amr_softc *sc)
   {
       device_t child;
   
       debug_called(1);
   
       /*
        * Initialise per-controller queues.
        */
       amr_init_qhead(&sc->amr_freecmds);
       amr_init_qhead(&sc->amr_ready);
       TAILQ_INIT(&sc->amr_cmd_clusters);
       bioq_init(&sc->amr_bioq);
   
       debug(2, "queue init done");
   
       /*
        * Configure for this controller type.
        */
       if (AMR_IS_QUARTZ(sc)) {
           sc->amr_submit_command = amr_quartz_submit_command;
           sc->amr_get_work       = amr_quartz_get_work;
           sc->amr_poll_command   = amr_quartz_poll_command;
           sc->amr_poll_command1  = amr_quartz_poll_command1;
       } else {
           sc->amr_submit_command = amr_std_submit_command;
           sc->amr_get_work       = amr_std_get_work;
           sc->amr_poll_command   = amr_std_poll_command;
           amr_std_attach_mailbox(sc);
       }
   
   #ifdef AMR_BOARD_INIT
       if ((AMR_IS_QUARTZ(sc) ? amr_quartz_init(sc) : amr_std_init(sc)))
           return(ENXIO);
   #endif
   
       /*
        * Allocate initial commands.
        */
       amr_alloccmd_cluster(sc);
   
       /*
        * Quiz controller for features and limits.
        */
       if (amr_query_controller(sc))
           return(ENXIO);
   
       debug(2, "controller query complete");
   
       /*
        * preallocate the remaining commands.
        */
       while (sc->amr_nextslot < sc->amr_maxio)
           amr_alloccmd_cluster(sc);
   
       /*
        * Setup sysctls.
        */
       sysctl_ctx_init(&sc->amr_sysctl_ctx);
       sc->amr_sysctl_tree = SYSCTL_ADD_NODE(&sc->amr_sysctl_ctx,
           SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
           device_get_nameunit(sc->amr_dev), CTLFLAG_RD, 0, "");
       if (sc->amr_sysctl_tree == NULL) {
           device_printf(sc->amr_dev, "can't add sysctl node\n");
           return (EINVAL);
       }
       amr_init_sysctl(sc);
   
       /*
        * Attach our 'real' SCSI channels to CAM.
        */
       child = device_add_child(sc->amr_dev, "amrp", -1);
       sc->amr_pass = child;
       if (child != NULL) {
           device_set_softc(child, sc);
           device_set_desc(child, "SCSI Passthrough Bus");
           bus_generic_attach(sc->amr_dev);
       }
   
       /*
        * Create the control device.
        */
       sc->amr_dev_t = make_dev(&amr_ops, device_get_unit(sc->amr_dev), UID_ROOT, GID_OPERATOR,
                                S_IRUSR | S_IWUSR, "amr%d", device_get_unit(sc->amr_dev));
       sc->amr_dev_t->si_drv1 = sc;
       linux_no_adapter++;
       if (device_get_unit(sc->amr_dev) == 0)
           make_dev_alias(sc->amr_dev_t, "megadev0");
   
       /*
        * Schedule ourselves to bring the controller up once interrupts are
        * available.
        */
       bzero(&sc->amr_ich, sizeof(struct intr_config_hook));
       sc->amr_ich.ich_func = amr_startup;
       sc->amr_ich.ich_arg = sc;
       sc->amr_ich.ich_desc = "amr";
       if (config_intrhook_establish(&sc->amr_ich) != 0) {
           device_printf(sc->amr_dev, "can't establish configuration hook\n");
           return(ENOMEM);
       }
   
       /*
        * Print a little information about the controller.
        */
       amr_describe_controller(sc);
   
       debug(2, "attach complete");
       return(0);
   }
   
   /********************************************************************************
    * Locate disk resources and attach children to them.
    */
   static void
   amr_startup(void *arg)
   {
       struct amr_softc    *sc = (struct amr_softc *)arg;
       struct amr_logdrive *dr;
       int                 i, error;
       
       debug_called(1);
   
       /* pull ourselves off the intrhook chain */
       if (sc->amr_ich.ich_func)
           config_intrhook_disestablish(&sc->amr_ich);
       sc->amr_ich.ich_func = NULL;
   
       /* get up-to-date drive information */
       if (amr_query_controller(sc)) {
           device_printf(sc->amr_dev, "can't scan controller for drives\n");
           return;
       }
   
       /* iterate over available drives */
       for (i = 0, dr = &sc->amr_drive[0]; (i < AMR_MAXLD) && (dr->al_size != 0xffffffff); i++, dr++) {
           /* are we already attached to this drive? */
           if (dr->al_disk == 0) {
               /* generate geometry information */
               if (dr->al_size > 0x200000) {       /* extended translation? */
                   dr->al_heads = 255;
                   dr->al_sectors = 63;
               } else {
                   dr->al_heads = 64;
                   dr->al_sectors = 32;
               }
               dr->al_cylinders = dr->al_size / (dr->al_heads * dr->al_sectors);
               
               dr->al_disk = device_add_child(sc->amr_dev, NULL, -1);
               if (dr->al_disk == 0)
                   device_printf(sc->amr_dev, "device_add_child failed\n");
               device_set_ivars(dr->al_disk, dr);
           }
       }
       
       if ((error = bus_generic_attach(sc->amr_dev)) != 0)
           device_printf(sc->amr_dev, "bus_generic_attach returned %d\n", error);
       
       /* mark controller back up */
       sc->amr_state &= ~AMR_STATE_SHUTDOWN;
   
       /* interrupts will be enabled before we do anything more */
       sc->amr_state |= AMR_STATE_INTEN;
   
       return;
   }
   
   static void
   amr_init_sysctl(struct amr_softc *sc)
   {
   
       SYSCTL_ADD_INT(&sc->amr_sysctl_ctx,
           SYSCTL_CHILDREN(sc->amr_sysctl_tree),
           OID_AUTO, "allow_volume_configure", CTLFLAG_RW, &sc->amr_allow_vol_config, 0,
           "");
       SYSCTL_ADD_INT(&sc->amr_sysctl_ctx,
           SYSCTL_CHILDREN(sc->amr_sysctl_tree),
           OID_AUTO, "nextslot", CTLFLAG_RD, &sc->amr_nextslot, 0,
           "");
       SYSCTL_ADD_INT(&sc->amr_sysctl_ctx,
           SYSCTL_CHILDREN(sc->amr_sysctl_tree),
           OID_AUTO, "busyslots", CTLFLAG_RD, &sc->amr_busyslots, 0,
           "");
       SYSCTL_ADD_INT(&sc->amr_sysctl_ctx,
           SYSCTL_CHILDREN(sc->amr_sysctl_tree),
           OID_AUTO, "maxio", CTLFLAG_RD, &sc->amr_maxio, 0,
           "");
   }
   
   
   /*******************************************************************************
    * Free resources associated with a controller instance
    */
   void
   amr_free(struct amr_softc *sc)
   {
       struct amr_command_cluster  *acc;
   
       /* detach from CAM */
       if (sc->amr_pass != NULL)
           device_delete_child(sc->amr_dev, sc->amr_pass);
   
       /* throw away any command buffers */
       while ((acc = TAILQ_FIRST(&sc->amr_cmd_clusters)) != NULL) {
           TAILQ_REMOVE(&sc->amr_cmd_clusters, acc, acc_link);
           amr_freecmd_cluster(acc);
       }
   
       /* destroy control device */
       if(sc->amr_dev_t != NULL)
               destroy_dev(sc->amr_dev_t);
       dev_ops_remove_minor(&amr_ops, device_get_unit(sc->amr_dev));
   
   #if 0 /* XXX swildner */
       if (mtx_initialized(&sc->amr_hw_lock))
           mtx_destroy(&sc->amr_hw_lock);
   
       if (mtx_initialized(&sc->amr_list_lock))
           mtx_destroy(&sc->amr_list_lock);
   #endif
   
       if (sc->amr_sysctl_tree != NULL)
               sysctl_ctx_free(&sc->amr_sysctl_ctx);
   
       lockuninit(&sc->amr_hw_lock);
       lockuninit(&sc->amr_list_lock);
   }
   
   /*******************************************************************************
    * Receive a bio structure from a child device and queue it on a particular
    * disk resource, then poke the disk resource to start as much work as it can.
    */
   int
   amr_submit_bio(struct amr_softc *sc, struct bio *bio)
   {
       debug_called(2);
   
       lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
       amr_enqueue_bio(sc, bio);
       amr_startio(sc);
       lockmgr(&sc->amr_list_lock, LK_RELEASE);
       return(0);
   }
   
   /********************************************************************************
    * Accept an open operation on the control device.
    */
   static int
   amr_open(struct dev_open_args *ap)
   {
       cdev_t              dev = ap->a_head.a_dev;
       int                 unit = minor(dev);
       struct amr_softc    *sc = devclass_get_softc(devclass_find("amr"), unit);
   
       debug_called(1);
   
       sc->amr_state |= AMR_STATE_OPEN;
       return(0);
   }
   
   /********************************************************************************
    * Accept the last close on the control device.
    */
   static int
   amr_close(struct dev_close_args *ap)
   {
       cdev_t              dev = ap->a_head.a_dev;
       int                 unit = minor(dev);
       struct amr_softc    *sc = devclass_get_softc(devclass_find("amr"), unit);
   
       debug_called(1);
   
       sc->amr_state &= ~AMR_STATE_OPEN;
       return (0);
   }
   
   /********************************************************************************
    * Handle controller-specific control operations.
    */
   static void
   amr_rescan_drives(struct cdev *dev)
   {
       struct amr_softc    *sc = (struct amr_softc *)dev->si_drv1;
       int                 i, error = 0;
   
       sc->amr_state |= AMR_STATE_REMAP_LD;
       while (sc->amr_busyslots) {
           device_printf(sc->amr_dev, "idle controller\n");
           amr_done(sc);
       }
   
       /* mark ourselves as in-shutdown */
       sc->amr_state |= AMR_STATE_SHUTDOWN;
   
       /* flush controller */
       device_printf(sc->amr_dev, "flushing cache...");
       kprintf("%s\n", amr_flush(sc) ? "failed" : "done");
   
       /* delete all our child devices */
       for(i = 0 ; i < AMR_MAXLD; i++) {
           if(sc->amr_drive[i].al_disk != 0) {
               if((error = device_delete_child(sc->amr_dev,
                   sc->amr_drive[i].al_disk)) != 0)
                   goto shutdown_out;
   
                sc->amr_drive[i].al_disk = 0;
           }
       }
   
   shutdown_out:
       amr_startup(sc);
   }
   
   /*
    * Bug-for-bug compatibility with Linux!
    * Some apps will send commands with inlen and outlen set to 0,
    * even though they expect data to be transfered to them from the
    * card.  Linux accidentally allows this by allocating a 4KB
    * buffer for the transfer anyways, but it then throws it away
    * without copying it back to the app.
    *
    * The amr(4) firmware relies on this feature.  In fact, it assumes
    * the buffer is always a power of 2 up to a max of 64k.  There is
    * also at least one case where it assumes a buffer less than 16k is
    * greater than 16k.  Force a minimum buffer size of 32k and round
    * sizes between 32k and 64k up to 64k as a workaround.
    */
   static unsigned long
   amr_ioctl_buffer_length(unsigned long len)
   {
   
       if (len <= 32 * 1024)
           return (32 * 1024);
       if (len <= 64 * 1024)
           return (64 * 1024);
       return (len);
   }
   
   int
   amr_linux_ioctl_int(struct cdev *dev, u_long cmd, caddr_t addr, int32_t flag,
       struct sysmsg *sm)
   {
       struct amr_softc            *sc = (struct amr_softc *)dev->si_drv1;
       struct amr_command          *ac;
       struct amr_mailbox          *mb;
       struct amr_linux_ioctl      ali;
       void                        *dp, *temp;
       int                         error;
       int                         len, ac_flags = 0;
       int                         logical_drives_changed = 0;
       u_int32_t                   linux_version = 0x02100000;
       u_int8_t                    status;
       struct amr_passthrough      *ap;    /* 60 bytes */
   
       error = 0;
       dp = NULL;
       ac = NULL;
       ap = NULL;
   
       if ((error = copyin(addr, &ali, sizeof(ali))) != 0)
           return (error);
       switch (ali.ui.fcs.opcode) {
       case 0x82:
           switch(ali.ui.fcs.subopcode) {
           case 'e':
               copyout(&linux_version, (void *)(uintptr_t)ali.data,
                   sizeof(linux_version));
               error = 0;
               break;
   
           case 'm':
               copyout(&linux_no_adapter, (void *)(uintptr_t)ali.data,
                   sizeof(linux_no_adapter));
               sm->sm_result.iresult = linux_no_adapter;
               error = 0;
               break;
   
           default:
               kprintf("Unknown subopcode\n");
               error = ENOIOCTL;
               break;
           }
       break;
   
       case 0x80:
       case 0x81:
           if (ali.ui.fcs.opcode == 0x80)
               len = max(ali.outlen, ali.inlen);
           else
               len = ali.ui.fcs.length;
   
           mb = (void *)&ali.mbox[0];
   
           if ((ali.mbox[0] == FC_DEL_LOGDRV  && ali.mbox[2] == OP_DEL_LOGDRV) ||  /* delete */
               (ali.mbox[0] == AMR_CMD_CONFIG && ali.mbox[2] == 0x0d)) {           /* create */
               if (sc->amr_allow_vol_config == 0) {
                   error = EPERM;
                   break;
               }
               logical_drives_changed = 1;
           }
   
           if (ali.mbox[0] == AMR_CMD_PASS) {
               lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
               while ((ac = amr_alloccmd(sc)) == NULL)
                   lksleep(sc, &sc->amr_list_lock, 0, "amrioc", hz);
               lockmgr(&sc->amr_list_lock, LK_RELEASE);
               ap = &ac->ac_ccb->ccb_pthru;
   
               error = copyin((void *)(uintptr_t)mb->mb_physaddr, ap,
                   sizeof(struct amr_passthrough));
               if (error)
                   break;
   
               if (ap->ap_data_transfer_length)
                   dp = kmalloc(ap->ap_data_transfer_length, M_AMR,
                       M_WAITOK | M_ZERO);
   
               if (ali.inlen) {
                   error = copyin((void *)(uintptr_t)ap->ap_data_transfer_address,
                       dp, ap->ap_data_transfer_length);
                   if (error)
                       break;
               }
   
               ac_flags = AMR_CMD_DATAIN|AMR_CMD_DATAOUT|AMR_CMD_CCB;
               bzero(&ac->ac_mailbox, sizeof(ac->ac_mailbox));
               ac->ac_mailbox.mb_command = AMR_CMD_PASS;
               ac->ac_flags = ac_flags;
   
               ac->ac_data = dp;
               ac->ac_length = ap->ap_data_transfer_length;
               temp = (void *)(uintptr_t)ap->ap_data_transfer_address;
   
               lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
               error = amr_wait_command(ac);
               lockmgr(&sc->amr_list_lock, LK_RELEASE);
               if (error)
                   break;
   
               status = ac->ac_status;
               error = copyout(&status, &((struct amr_passthrough *)(uintptr_t)mb->mb_physaddr)->ap_scsi_status, sizeof(status));
               if (error)
                   break;
   
               if (ali.outlen) {
                   error = copyout(dp, temp, ap->ap_data_transfer_length);
                   if (error)
                       break;
               }
               error = copyout(ap->ap_request_sense_area, ((struct amr_passthrough *)(uintptr_t)mb->mb_physaddr)->ap_request_sense_area, ap->ap_request_sense_length);
               if (error)
                   break;
   
               error = 0;
               break;
           } else if (ali.mbox[0] == AMR_CMD_PASS_64) {
               kprintf("No AMR_CMD_PASS_64\n");
               error = ENOIOCTL;
               break;
           } else if (ali.mbox[0] == AMR_CMD_EXTPASS) {
               kprintf("No AMR_CMD_EXTPASS\n");
               error = ENOIOCTL;
               break;
           } else {
               len = amr_ioctl_buffer_length(imax(ali.inlen, ali.outlen));
   
               dp = kmalloc(len, M_AMR, M_WAITOK | M_ZERO);
   
               if (ali.inlen) {
                   error = copyin((void *)(uintptr_t)mb->mb_physaddr, dp, len);
                   if (error)
                       break;
               }
   
               lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
               while ((ac = amr_alloccmd(sc)) == NULL)
                   lksleep(sc, &sc->amr_list_lock, 0, "amrioc", hz);
   
               ac_flags = AMR_CMD_DATAIN|AMR_CMD_DATAOUT;
               bzero(&ac->ac_mailbox, sizeof(ac->ac_mailbox));
               bcopy(&ali.mbox[0], &ac->ac_mailbox, sizeof(ali.mbox));
   
               ac->ac_length = len;
               ac->ac_data = dp;
               ac->ac_flags = ac_flags;
   
               error = amr_wait_command(ac);
               lockmgr(&sc->amr_list_lock, LK_RELEASE);
               if (error)
                   break;
   
               status = ac->ac_status;
               error = copyout(&status, &((struct amr_mailbox *)&((struct amr_linux_ioctl *)addr)->mbox[0])->mb_status, sizeof(status));
               if (ali.outlen) {
                   error = copyout(dp, (void *)(uintptr_t)mb->mb_physaddr, ali.outlen);
                   if (error)
                       break;
               }
   
               error = 0;
               if (logical_drives_changed)
                   amr_rescan_drives(dev);
               break;
           }
           break;
   
       default:
           debug(1, "unknown linux ioctl 0x%lx", cmd);
           kprintf("unknown linux ioctl 0x%lx\n", cmd);
           error = ENOIOCTL;
           break;
       }
   
       /*
        * At this point, we know that there is a lock held and that these
        * objects have been allocated.
        */
       lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
       if (ac != NULL)
           amr_releasecmd(ac);
       lockmgr(&sc->amr_list_lock, LK_RELEASE);
       if (dp != NULL)
           kfree(dp, M_AMR);
       return(error);
   }
   
   static int
   amr_ioctl(struct dev_ioctl_args *ap)
   {
       cdev_t                      dev = ap->a_head.a_dev;
       caddr_t                     addr = ap->a_data;
       u_long                      cmd = ap->a_cmd;
       struct amr_softc            *sc = (struct amr_softc *)dev->si_drv1;
       union {
           void                    *_p;
           struct amr_user_ioctl   *au;
   #ifdef AMR_IO_COMMAND32
           struct amr_user_ioctl32 *au32;
   #endif
           int                     *result;
       } arg;
       struct amr_command          *ac;
       struct amr_mailbox_ioctl    *mbi;
       void                        *dp, *au_buffer;
       unsigned long               au_length, real_length;
       unsigned char               *au_cmd;
       int                         *au_statusp;
       int                         error;
       struct amr_passthrough      *_ap;   /* 60 bytes */
       int                         logical_drives_changed = 0;
   
       debug_called(1);
   
       arg._p = (void *)addr;
   
       error = 0;
       dp = NULL;
       ac = NULL;
       _ap = NULL;
   
       switch(cmd) {
   
       case AMR_IO_VERSION:
           debug(1, "AMR_IO_VERSION");
           *arg.result = AMR_IO_VERSION_NUMBER;
           return(0);
   
   #ifdef AMR_IO_COMMAND32
       /*
        * Accept ioctl-s from 32-bit binaries on non-32-bit
        * platforms, such as AMD. LSI's MEGAMGR utility is
        * the only example known today...  -mi
        */
       case AMR_IO_COMMAND32:
           debug(1, "AMR_IO_COMMAND32 0x%x", arg.au32->au_cmd[0]);
           au_cmd = arg.au32->au_cmd;
           au_buffer = (void *)(u_int64_t)arg.au32->au_buffer;
           au_length = arg.au32->au_length;
           au_statusp = &arg.au32->au_status;
           break;
   #endif
   
       case AMR_IO_COMMAND:
           debug(1, "AMR_IO_COMMAND  0x%x", arg.au->au_cmd[0]);
           au_cmd = arg.au->au_cmd;
           au_buffer = (void *)arg.au->au_buffer;
           au_length = arg.au->au_length;
           au_statusp = &arg.au->au_status;
           break;
   
       case 0xc0046d00:
       case 0xc06e6d00:    /* Linux emulation */
           {
               devclass_t                  devclass;
               struct amr_linux_ioctl      ali;
               int                         adapter, error;
   
               devclass = devclass_find("amr");
               if (devclass == NULL)
                   return (ENOENT);
   
               error = copyin(addr, &ali, sizeof(ali));
               if (error)
                   return (error);
               if (ali.ui.fcs.opcode == 0x82)
                   adapter = 0;
               else
                   adapter = (ali.ui.fcs.adapno) ^ 'm' << 8;
   
               sc = devclass_get_softc(devclass, adapter);
               if (sc == NULL)
                   return (ENOENT);
   
               return (amr_linux_ioctl_int(sc->amr_dev_t, cmd, addr, 0, ap->a_sysmsg));
           }
       default:
           debug(1, "unknown ioctl 0x%lx", cmd);
           return(ENOIOCTL);
       }
   
       if ((au_cmd[0] == FC_DEL_LOGDRV && au_cmd[1] == OP_DEL_LOGDRV) ||   /* delete */
           (au_cmd[0] == AMR_CMD_CONFIG && au_cmd[1] == 0x0d)) {           /* create */
           if (sc->amr_allow_vol_config == 0) {
               error = EPERM;
               goto out;
           }
           logical_drives_changed = 1;
       }
   
       /* handle inbound data buffer */
       real_length = amr_ioctl_buffer_length(au_length);
       if (au_length != 0 && au_cmd[0] != 0x06) {
           if ((dp = kmalloc(real_length, M_AMR, M_WAITOK|M_ZERO)) == NULL) {
               error = ENOMEM;
               goto out;
           }
           if ((error = copyin(au_buffer, dp, au_length)) != 0) {
               kfree(dp, M_AMR);
               return (error);
           }
           debug(2, "copyin %ld bytes from %p -> %p", au_length, au_buffer, dp);
       }
   
       /* Allocate this now before the mutex gets held */
   
       lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
       while ((ac = amr_alloccmd(sc)) == NULL)
           lksleep(sc, &sc->amr_list_lock, 0, "amrioc", hz);
   
       /* handle SCSI passthrough command */
       if (au_cmd[0] == AMR_CMD_PASS) {
           int len;
   
           _ap = &ac->ac_ccb->ccb_pthru;
           bzero(_ap, sizeof(struct amr_passthrough));
   
           /* copy cdb */
           len = au_cmd[2];
           _ap->ap_cdb_length = len;
           bcopy(au_cmd + 3, _ap->ap_cdb, len);
   
           /* build passthrough */
           _ap->ap_timeout         = au_cmd[len + 3] & 0x07;
           _ap->ap_ars             = (au_cmd[len + 3] & 0x08) ? 1 : 0;
           _ap->ap_islogical       = (au_cmd[len + 3] & 0x80) ? 1 : 0;
           _ap->ap_logical_drive_no = au_cmd[len + 4];
           _ap->ap_channel         = au_cmd[len + 5];
           _ap->ap_scsi_id         = au_cmd[len + 6];
           _ap->ap_request_sense_length    = 14;
           _ap->ap_data_transfer_length    = au_length;
           /* XXX what about the request-sense area? does the caller want it? */
   
           /* build command */
           ac->ac_mailbox.mb_command = AMR_CMD_PASS;
           ac->ac_flags = AMR_CMD_CCB;
   
       } else {
           /* direct command to controller */
           mbi = (struct amr_mailbox_ioctl *)&ac->ac_mailbox;
   
           /* copy pertinent mailbox items */
           mbi->mb_command = au_cmd[0];
           mbi->mb_channel = au_cmd[1];
           mbi->mb_param = au_cmd[2];
           mbi->mb_pad[0] = au_cmd[3];
           mbi->mb_drive = au_cmd[4];
           ac->ac_flags = 0;
       }
   
       /* build the command */
       ac->ac_data = dp;
       ac->ac_length = real_length;
       ac->ac_flags |= AMR_CMD_DATAIN|AMR_CMD_DATAOUT;
   
       /* run the command */
       error = amr_wait_command(ac);
       lockmgr(&sc->amr_list_lock, LK_RELEASE);
       if (error)
           goto out;
   
       /* copy out data and set status */
       if (au_length != 0) {
           error = copyout(dp, au_buffer, au_length);
       }
       debug(2, "copyout %ld bytes from %p -> %p", au_length, dp, au_buffer);
       if (dp != NULL)
           debug(2, "%p status 0x%x", dp, ac->ac_status);
       *au_statusp = ac->ac_status;
   
   out:
       /*
        * At this point, we know that there is a lock held and that these
        * objects have been allocated.
        */
       lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
       if (ac != NULL)
           amr_releasecmd(ac);
       lockmgr(&sc->amr_list_lock, LK_RELEASE);
       if (dp != NULL)
           kfree(dp, M_AMR);
   
       if (logical_drives_changed)
           amr_rescan_drives(dev);
   
       return(error);
   }
   
   /********************************************************************************
    ********************************************************************************
                                                                    Command Wrappers
    ********************************************************************************
    ********************************************************************************/
   
   /********************************************************************************
    * Interrogate the controller for the operational parameters we require.
    */
   static int
   amr_query_controller(struct amr_softc *sc)
   {
       struct amr_enquiry3 *aex;
       struct amr_prodinfo *ap;
       struct amr_enquiry  *ae;
       int                 ldrv;
       int                 status;
   
       /*
        * Greater than 10 byte cdb support
        */
       sc->support_ext_cdb = amr_support_ext_cdb(sc);
   
       if(sc->support_ext_cdb) {
           debug(2,"supports extended CDBs.");
       }
   
       /* 
        * Try to issue an ENQUIRY3 command 
        */
       if ((aex = amr_enquiry(sc, 2048, AMR_CMD_CONFIG, AMR_CONFIG_ENQ3, 
                              AMR_CONFIG_ENQ3_SOLICITED_FULL, &status)) != NULL) {
   
           /*
            * Fetch current state of logical drives.
            */
           for (ldrv = 0; ldrv < aex->ae_numldrives; ldrv++) {
               sc->amr_drive[ldrv].al_size       = aex->ae_drivesize[ldrv];
               sc->amr_drive[ldrv].al_state      = aex->ae_drivestate[ldrv];
               sc->amr_drive[ldrv].al_properties = aex->ae_driveprop[ldrv];
               debug(2, "  drive %d: %d state %x properties %x", ldrv, sc->amr_drive[ldrv].al_size,
                     sc->amr_drive[ldrv].al_state, sc->amr_drive[ldrv].al_properties);
           }
           kfree(aex, M_AMR);
   
           /*
            * Get product info for channel count.
            */
           if ((ap = amr_enquiry(sc, 2048, AMR_CMD_CONFIG, AMR_CONFIG_PRODUCT_INFO, 0, &status)) == NULL) {
               device_printf(sc->amr_dev, "can't obtain product data from controller\n");
               return(1);
           }
           sc->amr_maxdrives = 40;
           sc->amr_maxchan = ap->ap_nschan;
           sc->amr_maxio = ap->ap_maxio;
           sc->amr_type |= AMR_TYPE_40LD;
           kfree(ap, M_AMR);
   
           ap = amr_enquiry(sc, 0, FC_DEL_LOGDRV, OP_SUP_DEL_LOGDRV, 0, &status);
           if (ap != NULL)
               kfree(ap, M_AMR);
           if (!status) {
               sc->amr_ld_del_supported = 1;
               device_printf(sc->amr_dev, "delete logical drives supported by controller\n");
           }
       } else {
   
           /* failed, try the 8LD ENQUIRY commands */
           if ((ae = (struct amr_enquiry *)amr_enquiry(sc, 2048, AMR_CMD_EXT_ENQUIRY2, 0, 0, &status)) == NULL) {
               if ((ae = (struct amr_enquiry *)amr_enquiry(sc, 2048, AMR_CMD_ENQUIRY, 0, 0, &status)) == NULL) {
                   device_printf(sc->amr_dev, "can't obtain configuration data from controller\n");
                   return(1);
               }
               ae->ae_signature = 0;
           }
   
           /*
            * Fetch current state of logical drives.
            */
           for (ldrv = 0; ldrv < ae->ae_ldrv.al_numdrives; ldrv++) {
               sc->amr_drive[ldrv].al_size       = ae->ae_ldrv.al_size[ldrv];
               sc->amr_drive[ldrv].al_state      = ae->ae_ldrv.al_state[ldrv];
               sc->amr_drive[ldrv].al_properties = ae->ae_ldrv.al_properties[ldrv];
               debug(2, "  drive %d: %d state %x properties %x\n", ldrv, sc->amr_drive[ldrv].al_size,
                     sc->amr_drive[ldrv].al_state, sc->amr_drive[ldrv].al_properties);
          }
  
          sc->amr_maxdrives = 8;
          sc->amr_maxchan = ae->ae_adapter.aa_channels;
          sc->amr_maxio = ae->ae_adapter.aa_maxio;
          kfree(ae, M_AMR);
      }
  
      /*
       * Mark remaining drives as unused.
       */
      for (; ldrv < AMR_MAXLD; ldrv++)
          sc->amr_drive[ldrv].al_size = 0xffffffff;
  
      /* 
       * Cap the maximum number of outstanding I/Os.  AMI's Linux driver doesn't trust
       * the controller's reported value, and lockups have been seen when we do.
       */
      sc->amr_maxio = imin(sc->amr_maxio, AMR_LIMITCMD);
  
      return(0);
  }
  
  /********************************************************************************
   * Run a generic enquiry-style command.
   */
  static void *
  amr_enquiry(struct amr_softc *sc, size_t bufsize, u_int8_t cmd, u_int8_t cmdsub, u_int8_t cmdqual, int *status)
  {
      struct amr_command  *ac;
      void                *result;
      u_int8_t            *mbox;
      int                 error;
  
      debug_called(1);
  
      error = 1;
      result = NULL;
      
      /* get ourselves a command buffer */
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
      ac = amr_alloccmd(sc);
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
      if (ac == NULL)
          goto out;
      /* allocate the response structure */
      if ((result = kmalloc(bufsize, M_AMR, M_ZERO|M_NOWAIT)) == NULL)
          goto out;
      /* set command flags */
  
      ac->ac_flags |= AMR_CMD_PRIORITY | AMR_CMD_DATAIN;
      
      /* point the command at our data */
      ac->ac_data = result;
      ac->ac_length = bufsize;
      
      /* build the command proper */
      mbox = (u_int8_t *)&ac->ac_mailbox;         /* XXX want a real structure for this? */
      mbox[0] = cmd;
      mbox[2] = cmdsub;
      mbox[3] = cmdqual;
      *status = 0;
  
      /* can't assume that interrupts are going to work here, so play it safe */
      if (sc->amr_poll_command(ac))
          goto out;
      error = ac->ac_status;
      *status = ac->ac_status;
      
   out:
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
      if (ac != NULL)
          amr_releasecmd(ac);
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
      if ((error != 0) && (result != NULL)) {
          kfree(result, M_AMR);
          result = NULL;
      }
      return(result);
  }
  
  /********************************************************************************
   * Flush the controller's internal cache, return status.
   */
  int
  amr_flush(struct amr_softc *sc)
  {
      struct amr_command  *ac;
      int                 error;
  
      /* get ourselves a command buffer */
      error = 1;
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
      ac = amr_alloccmd(sc);
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
      if (ac == NULL)
          goto out;
      /* set command flags */
      ac->ac_flags |= AMR_CMD_PRIORITY | AMR_CMD_DATAOUT;
      
      /* build the command proper */
      ac->ac_mailbox.mb_command = AMR_CMD_FLUSH;
  
      /* we have to poll, as the system may be going down or otherwise damaged */
      if (sc->amr_poll_command(ac))
          goto out;
      error = ac->ac_status;
      
   out:
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
      if (ac != NULL)
          amr_releasecmd(ac);
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
      return(error);
  }
  
  /********************************************************************************
   * Detect extented cdb >> greater than 10 byte cdb support
   * returns '1' means this support exist
   * returns '' means this support doesn't exist
   */
  static int
  amr_support_ext_cdb(struct amr_softc *sc)
  {
      struct amr_command  *ac;
      u_int8_t            *mbox;
      int                 error;
  
      /* get ourselves a command buffer */
      error = 0;
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
      ac = amr_alloccmd(sc);
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
      if (ac == NULL)
          goto out;
      /* set command flags */
      ac->ac_flags |= AMR_CMD_PRIORITY | AMR_CMD_DATAOUT;
  
      /* build the command proper */
      mbox = (u_int8_t *)&ac->ac_mailbox;         /* XXX want a real structure for this? */
      mbox[0] = 0xA4;
      mbox[2] = 0x16;
  
  
      /* we have to poll, as the system may be going down or otherwise damaged */
      if (sc->amr_poll_command(ac))
          goto out;
      if( ac->ac_status == AMR_STATUS_SUCCESS ) {
              error = 1;
      }
  
  out:
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
      if (ac != NULL)
          amr_releasecmd(ac);
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
      return(error);
  }
  
  /********************************************************************************
   * Try to find I/O work for the controller from one or more of the work queues.
   *
   * We make the assumption that if the controller is not ready to take a command
   * at some given time, it will generate an interrupt at some later time when
   * it is.
   */
  void
  amr_startio(struct amr_softc *sc)
  {
      struct amr_command  *ac;
  
      /* spin until something prevents us from doing any work */
      for (;;) {
  
          /* Don't bother to queue commands no bounce buffers are available. */
          if (sc->amr_state & AMR_STATE_QUEUE_FRZN)
              break;
  
          /* try to get a ready command */
          ac = amr_dequeue_ready(sc);
  
          /* if that failed, build a command from a bio */
          if (ac == NULL)
              (void)amr_bio_command(sc, &ac);
  
          /* if that failed, build a command from a ccb */
          if ((ac == NULL) && (sc->amr_cam_command != NULL))
              sc->amr_cam_command(sc, &ac);
  
          /* if we don't have anything to do, give up */
          if (ac == NULL)
              break;
  
          /* try to give the command to the controller; if this fails save it for later and give up */
          if (amr_start(ac)) {
              debug(2, "controller busy, command deferred");
              amr_requeue_ready(ac);      /* XXX schedule retry very soon? */
              break;
          }
      }
  }
  
  /********************************************************************************
   * Handle completion of an I/O command.
   */
  static void
  amr_completeio(struct amr_command *ac)
  {
      struct amr_softc            *sc = ac->ac_sc;
      static struct timeval       lastfail;
      static int                  curfail;
      struct buf                  *bp = ac->ac_bio->bio_buf;
  
      if (ac->ac_status != AMR_STATUS_SUCCESS) {  /* could be more verbose here? */
          bp->b_error = EIO;
          bp->b_flags |= B_ERROR;
  
          if (ppsratecheck(&lastfail, &curfail, 1))
              device_printf(sc->amr_dev, "I/O error - 0x%x\n", ac->ac_status);
  /*      amr_printcommand(ac);*/
      }
      amrd_intr(ac->ac_bio);
      lockmgr(&ac->ac_sc->amr_list_lock, LK_EXCLUSIVE);
      amr_releasecmd(ac);
      lockmgr(&ac->ac_sc->amr_list_lock, LK_RELEASE);
  }
  
  /********************************************************************************
   ********************************************************************************
                                                                 Command Processing
   ********************************************************************************
   ********************************************************************************/
  
  /********************************************************************************
   * Convert a bio off the top of the bio queue into a command.
   */
  static int
  amr_bio_command(struct amr_softc *sc, struct amr_command **acp)
  {
      struct amr_command  *ac;
      struct amrd_softc   *amrd;
      struct bio          *bio;
      struct buf          *bp;
      int                 error;
      int                 blkcount;
      int                 driveno;
      int                 cmd;
  
      ac = NULL;
      error = 0;
  
      /* get a command */
      if ((ac = amr_alloccmd(sc)) == NULL)
          return (ENOMEM);
  
      /* get a bio to work on */
      if ((bio = amr_dequeue_bio(sc)) == NULL) {
          amr_releasecmd(ac);
          return (0);
      }
  
      /* connect the bio to the command */
      bp = bio->bio_buf;
      ac->ac_complete = amr_completeio;
      ac->ac_bio = bio;
      ac->ac_data = bp->b_data;
      ac->ac_length = bp->b_bcount;
      cmd = 0;
      switch (bp->b_cmd) {
      case BUF_CMD_READ:
          ac->ac_flags |= AMR_CMD_DATAIN;
          if (AMR_IS_SG64(sc)) {
              cmd = AMR_CMD_LREAD64;
              ac->ac_flags |= AMR_CMD_SG64;
          } else
              cmd = AMR_CMD_LREAD;
          break;
      case BUF_CMD_WRITE:
          ac->ac_flags |= AMR_CMD_DATAOUT;
          if (AMR_IS_SG64(sc)) {
              cmd = AMR_CMD_LWRITE64;
              ac->ac_flags |= AMR_CMD_SG64;
          } else
              cmd = AMR_CMD_LWRITE;
          break;
      case BUF_CMD_FLUSH:
          ac->ac_flags |= AMR_CMD_PRIORITY | AMR_CMD_DATAOUT;
          cmd = AMR_CMD_FLUSH;
          break;
      default:
          panic("Invalid bio command");
      }
      amrd = (struct amrd_softc *)bio->bio_driver_info;
      driveno = amrd->amrd_drive - sc->amr_drive;
      blkcount = (bp->b_bcount + AMR_BLKSIZE - 1) / AMR_BLKSIZE;
  
      ac->ac_mailbox.mb_command = cmd;
      if (bp->b_cmd & (BUF_CMD_READ|BUF_CMD_WRITE)) {
          ac->ac_mailbox.mb_blkcount = blkcount;
          ac->ac_mailbox.mb_lba = bio->bio_offset / AMR_BLKSIZE;
          if (((bio->bio_offset / AMR_BLKSIZE) + blkcount) > sc->amr_drive[driveno].al_size) {
              device_printf(sc->amr_dev,
                            "I/O beyond end of unit (%lld,%d > %lu)\n",
                            (long long)(bio->bio_offset / AMR_BLKSIZE), blkcount,
                            (u_long)sc->amr_drive[driveno].al_size);
          }
      }
      ac->ac_mailbox.mb_drive = driveno;
      if (sc->amr_state & AMR_STATE_REMAP_LD)
          ac->ac_mailbox.mb_drive |= 0x80;
  
      /* we fill in the s/g related data when the command is mapped */
  
  
      *acp = ac;
      return(error);
  }
  
  /********************************************************************************
   * Take a command, submit it to the controller and sleep until it completes
   * or fails.  Interrupts must be enabled, returns nonzero on error.
   */
  static int
  amr_wait_command(struct amr_command *ac)
  {
      int                 error = 0;
      struct amr_softc    *sc = ac->ac_sc;
  
      debug_called(1);
  
      ac->ac_complete = NULL;
      ac->ac_flags |= AMR_CMD_SLEEP;
      if ((error = amr_start(ac)) != 0) {
          return(error);
      }
      
      while ((ac->ac_flags & AMR_CMD_BUSY) && (error != EWOULDBLOCK)) {
          error = lksleep(ac,&sc->amr_list_lock, 0, "amrwcmd", 0);
      }
  
      return(error);
  }
  
  /********************************************************************************
   * Take a command, submit it to the controller and busy-wait for it to return.
   * Returns nonzero on error.  Can be safely called with interrupts enabled.
   */
  static int
  amr_std_poll_command(struct amr_command *ac)
  {
      struct amr_softc    *sc = ac->ac_sc;
      int                 error, count;
  
      debug_called(2);
  
      ac->ac_complete = NULL;
      if ((error = amr_start(ac)) != 0)
          return(error);
  
      count = 0;
      do {
          /* 
           * Poll for completion, although the interrupt handler may beat us to it. 
           * Note that the timeout here is somewhat arbitrary.
           */
          amr_done(sc);
          DELAY(1000);
      } while ((ac->ac_flags & AMR_CMD_BUSY) && (count++ < 1000));
      if (!(ac->ac_flags & AMR_CMD_BUSY)) {
          error = 0;
      } else {
          /* XXX the slot is now marked permanently busy */
          error = EIO;
          device_printf(sc->amr_dev, "polled command timeout\n");
      }
      return(error);
  }
  
  static void
  amr_setup_polled_dmamap(void *arg, bus_dma_segment_t *segs, int nsegs, int err)
  {
      struct amr_command *ac = arg;
      struct amr_softc *sc = ac->ac_sc;
      int mb_channel;
  
      if (err) {
          device_printf(sc->amr_dev, "error %d in %s", err, __func__);
          ac->ac_status = AMR_STATUS_ABORTED;
          return;
      }
  
      amr_setup_sg(arg, segs, nsegs, err);
  
      /* for AMR_CMD_CONFIG Read/Write the s/g count goes elsewhere */
      mb_channel = ((struct amr_mailbox_ioctl *)&ac->ac_mailbox)->mb_channel;
      if (ac->ac_mailbox.mb_command == AMR_CMD_CONFIG &&
          ((mb_channel == AMR_CONFIG_READ_NVRAM_CONFIG) ||
          (mb_channel == AMR_CONFIG_WRITE_NVRAM_CONFIG)))
          ((struct amr_mailbox_ioctl *)&ac->ac_mailbox)->mb_param = ac->ac_nsegments;
  
      ac->ac_mailbox.mb_nsgelem = ac->ac_nsegments;
      ac->ac_mailbox.mb_physaddr = ac->ac_mb_physaddr;
      if (AC_IS_SG64(ac)) {
          ac->ac_sg64_hi = 0;
          ac->ac_sg64_lo = ac->ac_sgbusaddr;
      }
  
      sc->amr_poll_command1(sc, ac);
  }
  
  /********************************************************************************
   * Take a command, submit it to the controller and busy-wait for it to return.
   * Returns nonzero on error.  Can be safely called with interrupts enabled.
   */
  static int
  amr_quartz_poll_command(struct amr_command *ac)
  {
      struct amr_softc    *sc = ac->ac_sc;
      int                 error;
  
      debug_called(2);
  
      error = 0;
  
      if (AC_IS_SG64(ac)) {
          ac->ac_tag = sc->amr_buffer64_dmat;
          ac->ac_datamap = ac->ac_dma64map;
      } else {
          ac->ac_tag = sc->amr_buffer_dmat;
          ac->ac_datamap = ac->ac_dmamap;
      }
  
      /* now we have a slot, we can map the command (unmapped in amr_complete) */
      if (ac->ac_data != NULL && ac->ac_length != 0) {
          if (bus_dmamap_load(ac->ac_tag, ac->ac_datamap, ac->ac_data,
              ac->ac_length, amr_setup_polled_dmamap, ac, BUS_DMA_NOWAIT) != 0) {
              error = 1;
          }
      } else {
          error = amr_quartz_poll_command1(sc, ac);
      }
  
      return (error);
  }
  
  static int
  amr_quartz_poll_command1(struct amr_softc *sc, struct amr_command *ac)
  {
      int count, error;
  
      lockmgr(&sc->amr_hw_lock, LK_EXCLUSIVE);
      if ((sc->amr_state & AMR_STATE_INTEN) == 0) {
          count=0;
          while (sc->amr_busyslots) {
              lksleep(sc, &sc->amr_hw_lock, PCATCH, "amrpoll", hz);
              if(count++>10) {
                  break;
              }
          }
  
          if(sc->amr_busyslots) {
              device_printf(sc->amr_dev, "adapter is busy\n");
              lockmgr(&sc->amr_hw_lock, LK_RELEASE);
              if (ac->ac_data != NULL) {
                  bus_dmamap_unload(ac->ac_tag, ac->ac_datamap);
              }
              ac->ac_status=0;
              return(1);
          }
      }
  
      bcopy(&ac->ac_mailbox, (void *)(uintptr_t)(volatile void *)sc->amr_mailbox, AMR_MBOX_CMDSIZE);
  
      /* clear the poll/ack fields in the mailbox */
      sc->amr_mailbox->mb_ident = 0xFE;
      sc->amr_mailbox->mb_nstatus = 0xFF;
      sc->amr_mailbox->mb_status = 0xFF;
      sc->amr_mailbox->mb_poll = 0;
      sc->amr_mailbox->mb_ack = 0;
      sc->amr_mailbox->mb_busy = 1;
  
      AMR_QPUT_IDB(sc, sc->amr_mailboxphys | AMR_QIDB_SUBMIT);
  
      while(sc->amr_mailbox->mb_nstatus == 0xFF)
          DELAY(1);
      while(sc->amr_mailbox->mb_status == 0xFF)
          DELAY(1);
      ac->ac_status=sc->amr_mailbox->mb_status;
      error = (ac->ac_status !=AMR_STATUS_SUCCESS) ? 1:0;
      while(sc->amr_mailbox->mb_poll != 0x77)
          DELAY(1);
      sc->amr_mailbox->mb_poll = 0;
      sc->amr_mailbox->mb_ack = 0x77;
  
      /* acknowledge that we have the commands */
      AMR_QPUT_IDB(sc, sc->amr_mailboxphys | AMR_QIDB_ACK);
      while(AMR_QGET_IDB(sc) & AMR_QIDB_ACK)
          DELAY(1);
      lockmgr(&sc->amr_hw_lock, LK_RELEASE);
  
      /* unmap the command's data buffer */
      if (ac->ac_flags & AMR_CMD_DATAIN) {
          bus_dmamap_sync(ac->ac_tag, ac->ac_datamap, BUS_DMASYNC_POSTREAD);
      }
      if (ac->ac_flags & AMR_CMD_DATAOUT) {
          bus_dmamap_sync(ac->ac_tag, ac->ac_datamap, BUS_DMASYNC_POSTWRITE);
      }
      bus_dmamap_unload(ac->ac_tag, ac->ac_datamap);
  
      return(error);
  }
  
  static __inline int
  amr_freeslot(struct amr_command *ac)
  {
      struct amr_softc *sc = ac->ac_sc;
      int                 slot;
  
      debug_called(3);
  
      slot = ac->ac_slot;
      if (sc->amr_busycmd[slot] == NULL)
          panic("amr: slot %d not busy?", slot);
  
      sc->amr_busycmd[slot] = NULL;
      atomic_subtract_int(&sc->amr_busyslots, 1);
  
      return (0);
  }
  
  /********************************************************************************
   * Map/unmap (ac)'s data in the controller's addressable space as required.
   *
   * These functions may be safely called multiple times on a given command.
   */
  static void
  amr_setup_sg(void *arg, bus_dma_segment_t *segs, int nsegments, int error)
  {
      struct amr_command  *ac = (struct amr_command *)arg;
      struct amr_sgentry  *sg;
      struct amr_sg64entry *sg64;
      int flags, i;
  
      debug_called(3);
  
      /* get base address of s/g table */
      sg = ac->ac_sg.sg32;
      sg64 = ac->ac_sg.sg64;
  
      if (AC_IS_SG64(ac)) {
          ac->ac_nsegments = nsegments;
          ac->ac_mb_physaddr = 0xffffffff;
          for (i = 0; i < nsegments; i++, sg64++) {
              sg64->sg_addr = segs[i].ds_addr;
              sg64->sg_count = segs[i].ds_len;
          }
      } else {
          /* decide whether we need to populate the s/g table */
          if (nsegments < 2) {
              ac->ac_nsegments = 0;
              ac->ac_mb_physaddr = segs[0].ds_addr;
          } else {
              ac->ac_nsegments = nsegments;
              ac->ac_mb_physaddr = ac->ac_sgbusaddr;
              for (i = 0; i < nsegments; i++, sg++) {
                  sg->sg_addr = segs[i].ds_addr;
                  sg->sg_count = segs[i].ds_len;
              }
          }
      }
  
      flags = 0;
      if (ac->ac_flags & AMR_CMD_DATAIN)
          flags |= BUS_DMASYNC_PREREAD;
      if (ac->ac_flags & AMR_CMD_DATAOUT)
          flags |= BUS_DMASYNC_PREWRITE;
      bus_dmamap_sync(ac->ac_tag, ac->ac_datamap, flags);
      ac->ac_flags |= AMR_CMD_MAPPED;
  }
  
  static void
  amr_setup_data(void *arg, bus_dma_segment_t *segs, int nsegs, int err)
  {
      struct amr_command *ac = arg;
      struct amr_softc *sc = ac->ac_sc;
      int mb_channel;
  
      if (err) {
          device_printf(sc->amr_dev, "error %d in %s", err, __func__);
          amr_abort_load(ac);
          return;
      }
  
      amr_setup_sg(arg, segs, nsegs, err);
  
      /* for AMR_CMD_CONFIG Read/Write the s/g count goes elsewhere */
      mb_channel = ((struct amr_mailbox_ioctl *)&ac->ac_mailbox)->mb_channel;
      if (ac->ac_mailbox.mb_command == AMR_CMD_CONFIG &&
          ((mb_channel == AMR_CONFIG_READ_NVRAM_CONFIG) ||
          (mb_channel == AMR_CONFIG_WRITE_NVRAM_CONFIG)))
          ((struct amr_mailbox_ioctl *)&ac->ac_mailbox)->mb_param = ac->ac_nsegments;
  
      ac->ac_mailbox.mb_nsgelem = ac->ac_nsegments;
      ac->ac_mailbox.mb_physaddr = ac->ac_mb_physaddr;
      if (AC_IS_SG64(ac)) {
          ac->ac_sg64_hi = 0;
          ac->ac_sg64_lo = ac->ac_sgbusaddr;
      }
  
      if (sc->amr_submit_command(ac) == EBUSY) {
          amr_freeslot(ac);
          amr_requeue_ready(ac);
      }
  }
  
  static void
  amr_setup_ccb(void *arg, bus_dma_segment_t *segs, int nsegs, int err)
  {
      struct amr_command *ac = arg;
      struct amr_softc *sc = ac->ac_sc;
      struct amr_passthrough *ap = &ac->ac_ccb->ccb_pthru;
      struct amr_ext_passthrough *aep = &ac->ac_ccb->ccb_epthru;
  
      if (err) {
          device_printf(sc->amr_dev, "error %d in %s", err, __func__);
          amr_abort_load(ac);
          return;
      }
  
      /* Set up the mailbox portion of the command to point at the ccb */
      ac->ac_mailbox.mb_nsgelem = 0;
      ac->ac_mailbox.mb_physaddr = ac->ac_ccb_busaddr;
  
      amr_setup_sg(arg, segs, nsegs, err);
  
      switch (ac->ac_mailbox.mb_command) {
      case AMR_CMD_EXTPASS:
          aep->ap_no_sg_elements = ac->ac_nsegments;
          aep->ap_data_transfer_address = ac->ac_mb_physaddr;
          break;
      case AMR_CMD_PASS:
          ap->ap_no_sg_elements = ac->ac_nsegments;
          ap->ap_data_transfer_address = ac->ac_mb_physaddr;
          break;
      default:
          panic("Unknown ccb command");
      }
  
      if (sc->amr_submit_command(ac) == EBUSY) {
          amr_freeslot(ac);
          amr_requeue_ready(ac);
      }
  }
  
  static int
  amr_mapcmd(struct amr_command *ac)
  {
      bus_dmamap_callback_t *cb;
      struct amr_softc    *sc = ac->ac_sc;
  
      debug_called(3);
  
      if (AC_IS_SG64(ac)) {
          ac->ac_tag = sc->amr_buffer64_dmat;
          ac->ac_datamap = ac->ac_dma64map;
      } else {
          ac->ac_tag = sc->amr_buffer_dmat;
          ac->ac_datamap = ac->ac_dmamap;
      }
  
      if (ac->ac_flags & AMR_CMD_CCB)
          cb = amr_setup_ccb;
      else
          cb = amr_setup_data;
  
      /* if the command involves data at all, and hasn't been mapped */
      if ((ac->ac_flags & AMR_CMD_MAPPED) == 0 && (ac->ac_data != NULL)) {
          /* map the data buffers into bus space and build the s/g list */
          if (bus_dmamap_load(ac->ac_tag, ac->ac_datamap, ac->ac_data,
               ac->ac_length, cb, ac, 0) == EINPROGRESS) {
              sc->amr_state |= AMR_STATE_QUEUE_FRZN;
          }
     } else {
          if (sc->amr_submit_command(ac) == EBUSY) {
              amr_freeslot(ac);
              amr_requeue_ready(ac);
          }
     }
  
      return (0);
  }
  
  static void
  amr_unmapcmd(struct amr_command *ac)
  {
      int                 flag;
  
      debug_called(3);
  
      /* if the command involved data at all and was mapped */
      if (ac->ac_flags & AMR_CMD_MAPPED) {
  
          if (ac->ac_data != NULL) {
  
              flag = 0;
              if (ac->ac_flags & AMR_CMD_DATAIN)
                  flag |= BUS_DMASYNC_POSTREAD;
              if (ac->ac_flags & AMR_CMD_DATAOUT)
                  flag |= BUS_DMASYNC_POSTWRITE;
  
              bus_dmamap_sync(ac->ac_tag, ac->ac_datamap, flag);
              bus_dmamap_unload(ac->ac_tag, ac->ac_datamap);
          }
  
          ac->ac_flags &= ~AMR_CMD_MAPPED;
      }
  }
  
  static void
  amr_abort_load(struct amr_command *ac)
  {
      ac_qhead_t head;
      struct amr_softc *sc = ac->ac_sc;
  
      KKASSERT(lockstatus(&sc->amr_list_lock, curthread) != 0);
  
      ac->ac_status = AMR_STATUS_ABORTED;
      amr_init_qhead(&head);
      amr_enqueue_completed(ac, &head);
  
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
      amr_complete(sc, &head);
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
  }
  
  /********************************************************************************
   * Take a command and give it to the controller, returns 0 if successful, or
   * EBUSY if the command should be retried later.
   */
  static int
  amr_start(struct amr_command *ac)
  {
      struct amr_softc *sc;
      int error = 0;
      int slot;
  
      debug_called(3);
  
      /* mark command as busy so that polling consumer can tell */
      sc = ac->ac_sc;
      ac->ac_flags |= AMR_CMD_BUSY;
  
      /* get a command slot (freed in amr_done) */
      slot = ac->ac_slot;
      if (sc->amr_busycmd[slot] != NULL)
          panic("amr: slot %d busy?", slot);
      sc->amr_busycmd[slot] = ac;
      atomic_add_int(&sc->amr_busyslots, 1);
  
      /* Now we have a slot, we can map the command (unmapped in amr_complete). */
      if ((error = amr_mapcmd(ac)) == ENOMEM) {
          /*
           * Memroy resources are short, so free the slot and let this be tried
           * later.
           */
          amr_freeslot(ac);
      }
  
      return (error);
  }
  
  /********************************************************************************
   * Extract one or more completed commands from the controller (sc)
   *
   * Returns nonzero if any commands on the work queue were marked as completed.
   */
  
  int
  amr_done(struct amr_softc *sc)
  {
      ac_qhead_t          head;
      struct amr_command  *ac;
      struct amr_mailbox  mbox;
      int                 i, idx, result;
      
      debug_called(3);
  
      /* See if there's anything for us to do */
      result = 0;
      amr_init_qhead(&head);
  
      /* loop collecting completed commands */
      for (;;) {
          /* poll for a completed command's identifier and status */
          if (sc->amr_get_work(sc, &mbox)) {
              result = 1;
              
              /* iterate over completed commands in this result */
              for (i = 0; i < mbox.mb_nstatus; i++) {
                  /* get pointer to busy command */
                  idx = mbox.mb_completed[i] - 1;
                  ac = sc->amr_busycmd[idx];
  
                  /* really a busy command? */
                  if (ac != NULL) {
  
                      /* pull the command from the busy index */
                      amr_freeslot(ac);
                  
                      /* save status for later use */
                      ac->ac_status = mbox.mb_status;
                      amr_enqueue_completed(ac, &head);
                      debug(3, "completed command with status %x", mbox.mb_status);
                  } else {
                      device_printf(sc->amr_dev, "bad slot %d completed\n", idx);
                  }
              }
          } else
              break;      /* no work */
      }
  
      /* handle completion and timeouts */
      amr_complete(sc, &head);
  
      return(result);
  }
  
  /********************************************************************************
   * Do completion processing on done commands on (sc)
   */
  
  static void
  amr_complete(void *context, ac_qhead_t *head)
  {
      struct amr_softc    *sc = (struct amr_softc *)context;
      struct amr_command  *ac;
  
      debug_called(3);
  
      /* pull completed commands off the queue */
      for (;;) {
          ac = amr_dequeue_completed(sc, head);
          if (ac == NULL)
              break;
  
          /* unmap the command's data buffer */
          amr_unmapcmd(ac);
  
          /* 
           * Is there a completion handler? 
           */
          if (ac->ac_complete != NULL) {
              /* unbusy the command */
              ac->ac_flags &= ~AMR_CMD_BUSY;
              ac->ac_complete(ac);
              
              /* 
               * Is someone sleeping on this one?
               */
          } else {
              lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
              ac->ac_flags &= ~AMR_CMD_BUSY;
              if (ac->ac_flags & AMR_CMD_SLEEP) {
                  /* unbusy the command */
                  wakeup(ac);
              }
              lockmgr(&sc->amr_list_lock, LK_RELEASE);
          }
  
          if(!sc->amr_busyslots) {
              wakeup(sc);
          }
      }
  
      lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
      sc->amr_state &= ~AMR_STATE_QUEUE_FRZN;
      amr_startio(sc);
      lockmgr(&sc->amr_list_lock, LK_RELEASE);
  }
  
  /********************************************************************************
   ********************************************************************************
                                                          Command Buffer Management
   ********************************************************************************
   ********************************************************************************/
  
  /********************************************************************************
   * Get a new command buffer.
   *
   * This may return NULL in low-memory cases.
   *
   * If possible, we recycle a command buffer that's been used before.
   */
  struct amr_command *
  amr_alloccmd(struct amr_softc *sc)
  {
      struct amr_command  *ac;
  
      debug_called(3);
  
      ac = amr_dequeue_free(sc);
      if (ac == NULL) {
          sc->amr_state |= AMR_STATE_QUEUE_FRZN;
          return(NULL);
      }
  
      /* clear out significant fields */
      ac->ac_status = 0;
      bzero(&ac->ac_mailbox, sizeof(struct amr_mailbox));
      ac->ac_flags = 0;
      ac->ac_bio = NULL;
      ac->ac_data = NULL;
      ac->ac_complete = NULL;
      ac->ac_retries = 0;
      ac->ac_tag = NULL;
      ac->ac_datamap = NULL;
      return(ac);
  }
  
  /********************************************************************************
   * Release a command buffer for recycling.
   */
  void
  amr_releasecmd(struct amr_command *ac)
  {
      debug_called(3);
  
      amr_enqueue_free(ac);
  }
  
  /********************************************************************************
   * Allocate a new command cluster and initialise it.
   */
  static void
  amr_alloccmd_cluster(struct amr_softc *sc)
  {
      struct amr_command_cluster  *acc;
      struct amr_command          *ac;
      int                         i, nextslot;
  
      /*
       * If we haven't found the real limit yet, let us have a couple of
       * commands in order to be able to probe.
       */
      if (sc->amr_maxio == 0)
          sc->amr_maxio = 2;
  
      if (sc->amr_nextslot > sc->amr_maxio)
          return;
      acc = kmalloc(AMR_CMD_CLUSTERSIZE, M_AMR, M_NOWAIT | M_ZERO);
      if (acc != NULL) {
          nextslot = sc->amr_nextslot;
          lockmgr(&sc->amr_list_lock, LK_EXCLUSIVE);
          TAILQ_INSERT_TAIL(&sc->amr_cmd_clusters, acc, acc_link);
          lockmgr(&sc->amr_list_lock, LK_RELEASE);
          for (i = 0; i < AMR_CMD_CLUSTERCOUNT; i++) {
              ac = &acc->acc_command[i];
              ac->ac_sc = sc;
              ac->ac_slot = nextslot;
  
              /*
               * The SG table for each slot is a fixed size and is assumed to
               * to hold 64-bit s/g objects when the driver is configured to do
               * 64-bit DMA.  32-bit DMA commands still use the same table, but
               * cast down to 32-bit objects.
               */
              if (AMR_IS_SG64(sc)) {
                  ac->ac_sgbusaddr = sc->amr_sgbusaddr +
                      (ac->ac_slot * AMR_NSEG * sizeof(struct amr_sg64entry));
                  ac->ac_sg.sg64 = sc->amr_sg64table + (ac->ac_slot * AMR_NSEG);
              } else {
                  ac->ac_sgbusaddr = sc->amr_sgbusaddr +
                      (ac->ac_slot * AMR_NSEG * sizeof(struct amr_sgentry));
                  ac->ac_sg.sg32 = sc->amr_sgtable + (ac->ac_slot * AMR_NSEG);
              }
  
              ac->ac_ccb = sc->amr_ccb + ac->ac_slot;
              ac->ac_ccb_busaddr = sc->amr_ccb_busaddr +
                  (ac->ac_slot * sizeof(union amr_ccb));
  
              if (bus_dmamap_create(sc->amr_buffer_dmat, 0, &ac->ac_dmamap))
                  break;
              if (AMR_IS_SG64(sc) &&
                  (bus_dmamap_create(sc->amr_buffer64_dmat, 0,&ac->ac_dma64map)))
                  break;
              amr_releasecmd(ac);
              if (++nextslot > sc->amr_maxio)
                  break;
          }
          sc->amr_nextslot = nextslot;
      }
  }
  
  /********************************************************************************
   * Free a command cluster
   */
  static void
  amr_freecmd_cluster(struct amr_command_cluster *acc)
  {
      struct amr_softc    *sc = acc->acc_command[0].ac_sc;
      int                 i;
  
      for (i = 0; i < AMR_CMD_CLUSTERCOUNT; i++) {
          if (acc->acc_command[i].ac_sc == NULL)
              break;
          bus_dmamap_destroy(sc->amr_buffer_dmat, acc->acc_command[i].ac_dmamap);
          if (AMR_IS_SG64(sc))
                  bus_dmamap_destroy(sc->amr_buffer64_dmat, acc->acc_command[i].ac_dma64map);
      }
      kfree(acc, M_AMR);
  }
  
  /********************************************************************************
   ********************************************************************************
                                                           Interface-specific Shims
   ********************************************************************************
   ********************************************************************************/
  
  /********************************************************************************
   * Tell the controller that the mailbox contains a valid command
   */
  static int
  amr_quartz_submit_command(struct amr_command *ac)
  {
      struct amr_softc    *sc = ac->ac_sc;
      static struct timeval lastfail;
      static int          curfail;
      int                 i = 0;
  
      lockmgr(&sc->amr_hw_lock, LK_EXCLUSIVE);
      while (sc->amr_mailbox->mb_busy && (i++ < 10)) {
          DELAY(1);
          /* This is a no-op read that flushes pending mailbox updates */
          AMR_QGET_ODB(sc);
      }
      if (sc->amr_mailbox->mb_busy) {
          lockmgr(&sc->amr_hw_lock, LK_RELEASE);
          if (ac->ac_retries++ > 1000) {
              if (ppsratecheck(&lastfail, &curfail, 1))
                  device_printf(sc->amr_dev, "Too many retries on command %p.  "
                                "Controller is likely dead\n", ac);
              ac->ac_retries = 0;
          }
          return (EBUSY);
      }
  
      /*
       * Save the slot number so that we can locate this command when complete.
       * Note that ident = 0 seems to be special, so we don't use it.
       */
      ac->ac_mailbox.mb_ident = ac->ac_slot + 1; /* will be coppied into mbox */
      bcopy(&ac->ac_mailbox, (void *)(uintptr_t)(volatile void *)sc->amr_mailbox, 14);
      sc->amr_mailbox->mb_busy = 1;
      sc->amr_mailbox->mb_poll = 0;
      sc->amr_mailbox->mb_ack  = 0;
      sc->amr_mailbox64->sg64_hi = ac->ac_sg64_hi;
      sc->amr_mailbox64->sg64_lo = ac->ac_sg64_lo;
  
      AMR_QPUT_IDB(sc, sc->amr_mailboxphys | AMR_QIDB_SUBMIT);
      lockmgr(&sc->amr_hw_lock, LK_RELEASE);
      return(0);
  }
  
  static int
  amr_std_submit_command(struct amr_command *ac)
  {
      struct amr_softc    *sc = ac->ac_sc;
      static struct timeval lastfail;
      static int          curfail;
  
      lockmgr(&sc->amr_hw_lock, LK_EXCLUSIVE);
      if (AMR_SGET_MBSTAT(sc) & AMR_SMBOX_BUSYFLAG) {
          lockmgr(&sc->amr_hw_lock, LK_RELEASE);
          if (ac->ac_retries++ > 1000) {
              if (ppsratecheck(&lastfail, &curfail, 1))
                  device_printf(sc->amr_dev, "Too many retries on command %p.  "
                                "Controller is likely dead\n", ac);
              ac->ac_retries = 0;
          }
          return (EBUSY);
      }
  
      /*
       * Save the slot number so that we can locate this command when complete.
       * Note that ident = 0 seems to be special, so we don't use it.
       */
      ac->ac_mailbox.mb_ident = ac->ac_slot + 1; /* will be coppied into mbox */
      bcopy(&ac->ac_mailbox, (void *)(uintptr_t)(volatile void *)sc->amr_mailbox, 14);
      sc->amr_mailbox->mb_busy = 1;
      sc->amr_mailbox->mb_poll = 0;
      sc->amr_mailbox->mb_ack  = 0;
  
      AMR_SPOST_COMMAND(sc);
      lockmgr(&sc->amr_hw_lock, LK_RELEASE);
      return(0);
  }
  
  /********************************************************************************
   * Claim any work that the controller has completed; acknowledge completion,
   * save details of the completion in (mbsave)
   */
  static int
  amr_quartz_get_work(struct amr_softc *sc, struct amr_mailbox *mbsave)
  {
      int         worked, i;
      u_int32_t   outd;
      u_int8_t    nstatus;
      u_int8_t    completed[46];
  
      debug_called(3);
  
      worked = 0;
  
      /* work waiting for us? */
      if ((outd = AMR_QGET_ODB(sc)) == AMR_QODB_READY) {
  
          /* acknowledge interrupt */
          AMR_QPUT_ODB(sc, AMR_QODB_READY);
  
          while ((nstatus = sc->amr_mailbox->mb_nstatus) == 0xff)
              DELAY(1);
          sc->amr_mailbox->mb_nstatus = 0xff;
  
          /* wait until fw wrote out all completions */
          for (i = 0; i < nstatus; i++) {
              while ((completed[i] = sc->amr_mailbox->mb_completed[i]) == 0xff)
                  DELAY(1);
              sc->amr_mailbox->mb_completed[i] = 0xff;
          }
  
          /* Save information for later processing */
          mbsave->mb_nstatus = nstatus;
          mbsave->mb_status = sc->amr_mailbox->mb_status;
          sc->amr_mailbox->mb_status = 0xff;
  
          for (i = 0; i < nstatus; i++)
              mbsave->mb_completed[i] = completed[i];
  
          /* acknowledge that we have the commands */
          AMR_QPUT_IDB(sc, AMR_QIDB_ACK);
  
  #if 0
  #ifndef AMR_QUARTZ_GOFASTER
          /*
           * This waits for the controller to notice that we've taken the
           * command from it.  It's very inefficient, and we shouldn't do it,
           * but if we remove this code, we stop completing commands under
           * load.
           *
           * Peter J says we shouldn't do this.  The documentation says we
           * should.  Who is right?
           */
          while(AMR_QGET_IDB(sc) & AMR_QIDB_ACK)
              ;                           /* XXX aiee! what if it dies? */
  #endif
  #endif
  
          worked = 1;                     /* got some work */
      }
  
      return(worked);
  }
  
  static int
  amr_std_get_work(struct amr_softc *sc, struct amr_mailbox *mbsave)
  {
      int         worked;
      u_int8_t    istat;
  
      debug_called(3);
  
      worked = 0;
  
      /* check for valid interrupt status */
      istat = AMR_SGET_ISTAT(sc);
      if ((istat & AMR_SINTR_VALID) != 0) {
          AMR_SPUT_ISTAT(sc, istat);      /* ack interrupt status */
  
          /* save mailbox, which contains a list of completed commands */
          bcopy((void *)(uintptr_t)(volatile void *)sc->amr_mailbox, mbsave, sizeof(*mbsave));
  
          AMR_SACK_INTERRUPT(sc);         /* acknowledge we have the mailbox */
          worked = 1;
      }
  
      return(worked);
  }
  
  /********************************************************************************
   * Notify the controller of the mailbox location.
   */
  static void
  amr_std_attach_mailbox(struct amr_softc *sc)
  {
  
      /* program the mailbox physical address */
      AMR_SBYTE_SET(sc, AMR_SMBOX_0, sc->amr_mailboxphys         & 0xff);
      AMR_SBYTE_SET(sc, AMR_SMBOX_1, (sc->amr_mailboxphys >>  8) & 0xff);
      AMR_SBYTE_SET(sc, AMR_SMBOX_2, (sc->amr_mailboxphys >> 16) & 0xff);
      AMR_SBYTE_SET(sc, AMR_SMBOX_3, (sc->amr_mailboxphys >> 24) & 0xff);
      AMR_SBYTE_SET(sc, AMR_SMBOX_ENABLE, AMR_SMBOX_ADDR);
  
      /* clear any outstanding interrupt and enable interrupts proper */
      AMR_SACK_INTERRUPT(sc);
      AMR_SENABLE_INTR(sc);
  }
  
  #ifdef AMR_BOARD_INIT
  /********************************************************************************
   * Initialise the controller
   */
  static int
  amr_quartz_init(struct amr_softc *sc)
  {
      int         status, ostatus;
  
      device_printf(sc->amr_dev, "initial init status %x\n", AMR_QGET_INITSTATUS(sc));
  
      AMR_QRESET(sc);
  
      ostatus = 0xff;
      while ((status = AMR_QGET_INITSTATUS(sc)) != AMR_QINIT_DONE) {
          if (status != ostatus) {
              device_printf(sc->amr_dev, "(%x) %s\n", status, amr_describe_code(amr_table_qinit, status));
              ostatus = status;
          }
          switch (status) {
          case AMR_QINIT_NOMEM:
              return(ENOMEM);
  
          case AMR_QINIT_SCAN:
              /* XXX we could print channel/target here */
              break;
          }
      }
      return(0);
  }
  
  static int
  amr_std_init(struct amr_softc *sc)
  {
      int         status, ostatus;
  
      device_printf(sc->amr_dev, "initial init status %x\n", AMR_SGET_INITSTATUS(sc));
  
      AMR_SRESET(sc);
   
      ostatus = 0xff;
      while ((status = AMR_SGET_INITSTATUS(sc)) != AMR_SINIT_DONE) {
          if (status != ostatus) {
              device_printf(sc->amr_dev, "(%x) %s\n", status, amr_describe_code(amr_table_sinit, status));
              ostatus = status;
          }
          switch (status) {
          case AMR_SINIT_NOMEM:
              return(ENOMEM);
  
          case AMR_SINIT_INPROG:
              /* XXX we could print channel/target here? */
              break;
          }
      }
      return(0);
  }
  #endif
  
  /********************************************************************************
   ********************************************************************************
                                                                          Debugging
   ********************************************************************************
   ********************************************************************************/
  
  /********************************************************************************
   * Identify the controller and print some information about it.
   */
  static void
  amr_describe_controller(struct amr_softc *sc)
  {
      struct amr_prodinfo *ap;
      struct amr_enquiry  *ae;
      char                *prod;
      int                 status;
  
      /*
       * Try to get 40LD product info, which tells us what the card is labelled as.
       */
      if ((ap = amr_enquiry(sc, 2048, AMR_CMD_CONFIG, AMR_CONFIG_PRODUCT_INFO, 0, &status)) != NULL) {
          device_printf(sc->amr_dev, "<LSILogic %.80s> Firmware %.16s, BIOS %.16s, %dMB RAM\n",
                        ap->ap_product, ap->ap_firmware, ap->ap_bios,
                        ap->ap_memsize);
  
          kfree(ap, M_AMR);
          return;
      }
  
      /*
       * Try 8LD extended ENQUIRY to get controller signature, and use lookup table.
       */
      if ((ae = (struct amr_enquiry *)amr_enquiry(sc, 2048, AMR_CMD_EXT_ENQUIRY2, 0, 0, &status)) != NULL) {
          prod = amr_describe_code(amr_table_adaptertype, ae->ae_signature);
  
      } else if ((ae = (struct amr_enquiry *)amr_enquiry(sc, 2048, AMR_CMD_ENQUIRY, 0, 0, &status)) != NULL) {
  
          /*
           * Try to work it out based on the PCI signatures.
           */
          switch (pci_get_device(sc->amr_dev)) {
          case 0x9010:
              prod = "Series 428";
              break;
          case 0x9060:
              prod = "Series 434";
              break;
          default:
              prod = "unknown controller";
              break;
          }
      } else {
          device_printf(sc->amr_dev, "<unsupported controller>\n");
          return;
      }
  
      /*
       * HP NetRaid controllers have a special encoding of the firmware and
       * BIOS versions. The AMI version seems to have it as strings whereas
       * the HP version does it with a leading uppercase character and two
       * binary numbers.
       */
       
      if(ae->ae_adapter.aa_firmware[2] >= 'A' &&
         ae->ae_adapter.aa_firmware[2] <= 'Z' &&
         ae->ae_adapter.aa_firmware[1] <  ' ' &&
         ae->ae_adapter.aa_firmware[0] <  ' ' &&
         ae->ae_adapter.aa_bios[2] >= 'A'     &&
         ae->ae_adapter.aa_bios[2] <= 'Z'     &&
         ae->ae_adapter.aa_bios[1] <  ' '     &&
         ae->ae_adapter.aa_bios[0] <  ' ') {
  
          /* this looks like we have an HP NetRaid version of the MegaRaid */
  
          if(ae->ae_signature == AMR_SIG_438) {
                  /* the AMI 438 is a NetRaid 3si in HP-land */
                  prod = "HP NetRaid 3si";
          }
          
          device_printf(sc->amr_dev, "<%s> Firmware %c.%02d.%02d, BIOS %c.%02d.%02d, %dMB RAM\n",
                        prod, ae->ae_adapter.aa_firmware[2],
                        ae->ae_adapter.aa_firmware[1],
                        ae->ae_adapter.aa_firmware[0],
                        ae->ae_adapter.aa_bios[2],
                        ae->ae_adapter.aa_bios[1],
                        ae->ae_adapter.aa_bios[0],
                        ae->ae_adapter.aa_memorysize);            
      } else {
          device_printf(sc->amr_dev, "<%s> Firmware %.4s, BIOS %.4s, %dMB RAM\n", 
                        prod, ae->ae_adapter.aa_firmware, ae->ae_adapter.aa_bios,
                        ae->ae_adapter.aa_memorysize);
      }           
      kfree(ae, M_AMR);
  }
  
  int
  amr_dump_blocks(struct amr_softc *sc, int unit, u_int32_t lba, void *data, int blks)
  {
      struct amr_command  *ac;
      int                 error = EIO;
  
      debug_called(1);
  
      sc->amr_state |= AMR_STATE_INTEN;
  
      /* get ourselves a command buffer */
      if ((ac = amr_alloccmd(sc)) == NULL)
          goto out;
      /* set command flags */
      ac->ac_flags |= AMR_CMD_PRIORITY | AMR_CMD_DATAOUT;
      
      /* point the command at our data */
      ac->ac_data = data;
      ac->ac_length = blks * AMR_BLKSIZE;
      
      /* build the command proper */
      ac->ac_mailbox.mb_command   = AMR_CMD_LWRITE;
      ac->ac_mailbox.mb_blkcount  = blks;
      ac->ac_mailbox.mb_lba       = lba;
      ac->ac_mailbox.mb_drive     = unit;
  
      /* can't assume that interrupts are going to work here, so play it safe */
      if (sc->amr_poll_command(ac))
          goto out;
      error = ac->ac_status;
      
   out:
      if (ac != NULL)
          amr_releasecmd(ac);
  
      sc->amr_state &= ~AMR_STATE_INTEN;
      return (error);
  }
  
  
  
  #ifdef AMR_DEBUG
  /********************************************************************************
   * Print the command (ac) in human-readable format
   */
  #if 0
  static void
  amr_printcommand(struct amr_command *ac)
  {
      struct amr_softc    *sc = ac->ac_sc;
      struct amr_sgentry  *sg;
      int                 i;
      
      device_printf(sc->amr_dev, "cmd %x  ident %d  drive %d\n",
                    ac->ac_mailbox.mb_command, ac->ac_mailbox.mb_ident, ac->ac_mailbox.mb_drive);
      device_printf(sc->amr_dev, "blkcount %d  lba %d\n", 
                    ac->ac_mailbox.mb_blkcount, ac->ac_mailbox.mb_lba);
      device_printf(sc->amr_dev, "virtaddr %p  length %lu\n", ac->ac_data, (unsigned long)ac->ac_length);
      device_printf(sc->amr_dev, "sg physaddr %08x  nsg %d\n",
                    ac->ac_mailbox.mb_physaddr, ac->ac_mailbox.mb_nsgelem);
      device_printf(sc->amr_dev, "ccb %p  bio %p\n", ac->ac_ccb_data, ac->ac_bio);
  
      /* get base address of s/g table */
      sg = sc->amr_sgtable + (ac->ac_slot * AMR_NSEG);
      for (i = 0; i < ac->ac_mailbox.mb_nsgelem; i++, sg++)
          device_printf(sc->amr_dev, "  %x/%d\n", sg->sg_addr, sg->sg_count);
  }
  #endif
  #endif

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