FreeBSD/Linux Kernel Cross Reference
sys/dev/raid/mps/mps_user.c

     /*-
      * Copyright (c) 2008 Yahoo!, Inc.
      * All rights reserved.
      * Written by: John Baldwin <jhb@FreeBSD.org>
      *
      * 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. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * 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.
     *
     * LSI MPT-Fusion Host Adapter FreeBSD userland interface
     */
    /*-
     * Copyright (c) 2011 LSI Corp.
     * 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.
     *
     * LSI MPT-Fusion Host Adapter FreeBSD
     *
     * $FreeBSD: src/sys/dev/mps/mps_user.c,v 1.10 2012/01/26 18:17:21 ken Exp $
     */
    
    #include "opt_compat.h"
    
    /* TODO Move headers to mpsvar */
    #include <sys/types.h>
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/eventhandler.h>
    #include <sys/bio.h>
    #include <sys/malloc.h>
    #include <sys/uio.h>
    #include <sys/sysctl.h>
    #include <sys/ioccom.h>
    #include <sys/endian.h>
    #include <sys/queue.h>
    #include <sys/kthread.h>
    #include <sys/taskqueue.h>
    #include <sys/proc.h>
    #include <sys/sysent.h>
    
    #include <sys/rman.h>
    #include <sys/device.h>
    
    #include <bus/cam/cam.h>
    #include <bus/cam/scsi/scsi_all.h>
    
    #include <dev/raid/mps/mpi/mpi2_type.h>
    #include <dev/raid/mps/mpi/mpi2.h>
    #include <dev/raid/mps/mpi/mpi2_ioc.h>
    #include <dev/raid/mps/mpi/mpi2_cnfg.h>
    #include <dev/raid/mps/mpi/mpi2_init.h>
    #include <dev/raid/mps/mpi/mpi2_tool.h>
    #include <dev/raid/mps/mps_ioctl.h>
    #include <dev/raid/mps/mpsvar.h>
    #include <dev/raid/mps/mps_table.h>
   #include <dev/raid/mps/mps_sas.h>
   #include <bus/pci/pcivar.h>
   #include <bus/pci/pcireg.h>
   
   static d_open_t         mps_open;
   static d_close_t        mps_close;
   static d_ioctl_t        mps_ioctl_devsw;
   
   static struct dev_ops mps_ops = {
           { "mps", 0, 0 },
           .d_open =       mps_open,
           .d_close =      mps_close,
           .d_ioctl =      mps_ioctl_devsw,
   };
   
   typedef int (mps_user_f)(struct mps_command *, struct mps_usr_command *);
   static mps_user_f       mpi_pre_ioc_facts;
   static mps_user_f       mpi_pre_port_facts;
   static mps_user_f       mpi_pre_fw_download;
   static mps_user_f       mpi_pre_fw_upload;
   static mps_user_f       mpi_pre_sata_passthrough;
   static mps_user_f       mpi_pre_smp_passthrough;
   static mps_user_f       mpi_pre_config;
   static mps_user_f       mpi_pre_sas_io_unit_control;
   
   static int mps_user_read_cfg_header(struct mps_softc *,
                                       struct mps_cfg_page_req *);
   static int mps_user_read_cfg_page(struct mps_softc *,
                                     struct mps_cfg_page_req *, void *);
   static int mps_user_read_extcfg_header(struct mps_softc *,
                                        struct mps_ext_cfg_page_req *);
   static int mps_user_read_extcfg_page(struct mps_softc *,
                                        struct mps_ext_cfg_page_req *, void *);
   static int mps_user_write_cfg_page(struct mps_softc *,
                                      struct mps_cfg_page_req *, void *);
   static int mps_user_setup_request(struct mps_command *,
                                     struct mps_usr_command *);
   static int mps_user_command(struct mps_softc *, struct mps_usr_command *);
   
   static int mps_user_pass_thru(struct mps_softc *sc, mps_pass_thru_t *data);
   static void mps_user_get_adapter_data(struct mps_softc *sc,
       mps_adapter_data_t *data);
   static void mps_user_read_pci_info(struct mps_softc *sc,
       mps_pci_info_t *data);
   static uint8_t mps_get_fw_diag_buffer_number(struct mps_softc *sc,
       uint32_t unique_id);
   static int mps_post_fw_diag_buffer(struct mps_softc *sc,
       mps_fw_diagnostic_buffer_t *pBuffer, uint32_t *return_code);
   static int mps_release_fw_diag_buffer(struct mps_softc *sc,
       mps_fw_diagnostic_buffer_t *pBuffer, uint32_t *return_code,
       uint32_t diag_type);
   static int mps_diag_register(struct mps_softc *sc,
       mps_fw_diag_register_t *diag_register, uint32_t *return_code);
   static int mps_diag_unregister(struct mps_softc *sc,
       mps_fw_diag_unregister_t *diag_unregister, uint32_t *return_code);
   static int mps_diag_query(struct mps_softc *sc, mps_fw_diag_query_t *diag_query,
       uint32_t *return_code);
   static int mps_diag_read_buffer(struct mps_softc *sc,
       mps_diag_read_buffer_t *diag_read_buffer, uint8_t *ioctl_buf,
       uint32_t *return_code);
   static int mps_diag_release(struct mps_softc *sc,
       mps_fw_diag_release_t *diag_release, uint32_t *return_code);
   static int mps_do_diag_action(struct mps_softc *sc, uint32_t action,
       uint8_t *diag_action, uint32_t length, uint32_t *return_code);
   static int mps_user_diag_action(struct mps_softc *sc, mps_diag_action_t *data);
   static void mps_user_event_query(struct mps_softc *sc, mps_event_query_t *data);
   static void mps_user_event_enable(struct mps_softc *sc,
       mps_event_enable_t *data);
   static int mps_user_event_report(struct mps_softc *sc,
       mps_event_report_t *data);
   static int mps_user_reg_access(struct mps_softc *sc, mps_reg_access_t *data);
   static int mps_user_btdh(struct mps_softc *sc, mps_btdh_mapping_t *data);
   
   static MALLOC_DEFINE(M_MPSUSER, "mps_user", "Buffers for mps(4) ioctls");
   
   /* Macros from compat/freebsd32/freebsd32.h */
   #define PTRIN(v)        (void *)(uintptr_t)(v)
   #define PTROUT(v)       (uint32_t)(uintptr_t)(v)
   
   #define CP(src,dst,fld) do { (dst).fld = (src).fld; } while (0)
   #define PTRIN_CP(src,dst,fld)                           \
           do { (dst).fld = PTRIN((src).fld); } while (0)
   #define PTROUT_CP(src,dst,fld) \
           do { (dst).fld = PTROUT((src).fld); } while (0)
   
   int
   mps_attach_user(struct mps_softc *sc)
   {
           int unit;
   
           unit = device_get_unit(sc->mps_dev);
           sc->mps_cdev = make_dev(&mps_ops, unit, UID_ROOT, GID_OPERATOR, 0640,
               "mps%d", unit);
           if (sc->mps_cdev == NULL) {
                   return (ENOMEM);
           }
           sc->mps_cdev->si_drv1 = sc;
           return (0);
   }
   
   void
   mps_detach_user(struct mps_softc *sc)
   {
   
           /* XXX: do a purge of pending requests? */
           if (sc->mps_cdev != NULL)
                   destroy_dev(sc->mps_cdev);
   }
   
   static int
   mps_open(struct dev_open_args *ap)
   {
   
           return (0);
   }
   
   static int
   mps_close(struct dev_close_args *ap)
   {
   
           return (0);
   }
   
   static int
   mps_user_read_cfg_header(struct mps_softc *sc,
       struct mps_cfg_page_req *page_req)
   {
           MPI2_CONFIG_PAGE_HEADER *hdr;
           struct mps_config_params params;
           int         error;
   
           hdr = &params.hdr.Struct;
           params.action = MPI2_CONFIG_ACTION_PAGE_HEADER;
           params.page_address = le32toh(page_req->page_address);
           hdr->PageVersion = 0;
           hdr->PageLength = 0;
           hdr->PageNumber = page_req->header.PageNumber;
           hdr->PageType = page_req->header.PageType;
           params.buffer = NULL;
           params.length = 0;
           params.callback = NULL;
   
           if ((error = mps_read_config_page(sc, &params)) != 0) {
                   /*
                    * Leave the request. Without resetting the chip, it's
                    * still owned by it and we'll just get into trouble
                    * freeing it now. Mark it as abandoned so that if it
                    * shows up later it can be freed.
                    */
                   mps_printf(sc, "read_cfg_header timed out\n");
                   return (ETIMEDOUT);
           }
   
           page_req->ioc_status = htole16(params.status);
           if ((page_req->ioc_status & MPI2_IOCSTATUS_MASK) ==
               MPI2_IOCSTATUS_SUCCESS) {
                   bcopy(hdr, &page_req->header, sizeof(page_req->header));
           }
   
           return (0);
   }
   
   static int
   mps_user_read_cfg_page(struct mps_softc *sc, struct mps_cfg_page_req *page_req,
       void *buf)
   {
           MPI2_CONFIG_PAGE_HEADER *reqhdr, *hdr;
           struct mps_config_params params;
           int           error;
   
           reqhdr = buf;
           hdr = &params.hdr.Struct;
           hdr->PageVersion = reqhdr->PageVersion;
           hdr->PageLength = reqhdr->PageLength;
           hdr->PageNumber = reqhdr->PageNumber;
           hdr->PageType = reqhdr->PageType & MPI2_CONFIG_PAGETYPE_MASK;
           params.action = MPI2_CONFIG_ACTION_PAGE_READ_CURRENT;
           params.page_address = le32toh(page_req->page_address);
           params.buffer = buf;
           params.length = le32toh(page_req->len);
           params.callback = NULL;
   
           if ((error = mps_read_config_page(sc, &params)) != 0) {
                   mps_printf(sc, "mps_user_read_cfg_page timed out\n");
                   return (ETIMEDOUT);
           }
   
           page_req->ioc_status = htole16(params.status);
           return (0);
   }
   
   static int
   mps_user_read_extcfg_header(struct mps_softc *sc,
       struct mps_ext_cfg_page_req *ext_page_req)
   {
           MPI2_CONFIG_EXTENDED_PAGE_HEADER *hdr;
           struct mps_config_params params;
           int         error;
   
           hdr = &params.hdr.Ext;
           params.action = MPI2_CONFIG_ACTION_PAGE_HEADER;
           hdr->PageVersion = ext_page_req->header.PageVersion;
           hdr->PageType = MPI2_CONFIG_PAGETYPE_EXTENDED;
           hdr->ExtPageLength = 0;
           hdr->PageNumber = ext_page_req->header.PageNumber;
           hdr->ExtPageType = ext_page_req->header.ExtPageType;
           params.page_address = le32toh(ext_page_req->page_address);
           if ((error = mps_read_config_page(sc, &params)) != 0) {
                   /*
                    * Leave the request. Without resetting the chip, it's
                    * still owned by it and we'll just get into trouble
                    * freeing it now. Mark it as abandoned so that if it
                    * shows up later it can be freed.
                    */
                   mps_printf(sc, "mps_user_read_extcfg_header timed out\n");
                   return (ETIMEDOUT);
           }
   
           ext_page_req->ioc_status = htole16(params.status);
           if ((ext_page_req->ioc_status & MPI2_IOCSTATUS_MASK) ==
               MPI2_IOCSTATUS_SUCCESS) {
                   ext_page_req->header.PageVersion = hdr->PageVersion;
                   ext_page_req->header.PageNumber = hdr->PageNumber;
                   ext_page_req->header.PageType = hdr->PageType;
                   ext_page_req->header.ExtPageLength = hdr->ExtPageLength;
                   ext_page_req->header.ExtPageType = hdr->ExtPageType;
           }
   
           return (0);
   }
   
   static int
   mps_user_read_extcfg_page(struct mps_softc *sc,
       struct mps_ext_cfg_page_req *ext_page_req, void *buf)
   {
           MPI2_CONFIG_EXTENDED_PAGE_HEADER *reqhdr, *hdr;
           struct mps_config_params params;
           int error;
   
           reqhdr = buf;
           hdr = &params.hdr.Ext;
           params.action = MPI2_CONFIG_ACTION_PAGE_READ_CURRENT;
           params.page_address = le32toh(ext_page_req->page_address);
           hdr->PageVersion = reqhdr->PageVersion;
           hdr->PageType = MPI2_CONFIG_PAGETYPE_EXTENDED;
           hdr->PageNumber = reqhdr->PageNumber;
           hdr->ExtPageType = reqhdr->ExtPageType;
           hdr->ExtPageLength = reqhdr->ExtPageLength;
           params.buffer = buf;
           params.length = le32toh(ext_page_req->len);
           params.callback = NULL;
   
           if ((error = mps_read_config_page(sc, &params)) != 0) {
                   mps_printf(sc, "mps_user_read_extcfg_page timed out\n");
                   return (ETIMEDOUT);
           }
   
           ext_page_req->ioc_status = htole16(params.status);
           return (0);
   }
   
   static int
   mps_user_write_cfg_page(struct mps_softc *sc,
       struct mps_cfg_page_req *page_req, void *buf)
   {
           MPI2_CONFIG_PAGE_HEADER *reqhdr, *hdr;
           struct mps_config_params params;
           u_int         hdr_attr;
           int           error;
   
           reqhdr = buf;
           hdr = &params.hdr.Struct;
           hdr_attr = reqhdr->PageType & MPI2_CONFIG_PAGEATTR_MASK;
           if (hdr_attr != MPI2_CONFIG_PAGEATTR_CHANGEABLE &&
               hdr_attr != MPI2_CONFIG_PAGEATTR_PERSISTENT) {
                   mps_printf(sc, "page type 0x%x not changeable\n",
                           reqhdr->PageType & MPI2_CONFIG_PAGETYPE_MASK);
                   return (EINVAL);
           }
   
           /*
            * There isn't any point in restoring stripped out attributes
            * if you then mask them going down to issue the request.
            */
   
           hdr->PageVersion = reqhdr->PageVersion;
           hdr->PageLength = reqhdr->PageLength;
           hdr->PageNumber = reqhdr->PageNumber;
           hdr->PageType = reqhdr->PageType;
           params.action = MPI2_CONFIG_ACTION_PAGE_WRITE_CURRENT;
           params.page_address = le32toh(page_req->page_address);
           params.buffer = buf;
           params.length = le32toh(page_req->len);
           params.callback = NULL;
   
           if ((error = mps_write_config_page(sc, &params)) != 0) {
                   mps_printf(sc, "mps_write_cfg_page timed out\n");
                   return (ETIMEDOUT);
           }
   
           page_req->ioc_status = htole16(params.status);
           return (0);
   }
   
   void
   mpi_init_sge(struct mps_command *cm, void *req, void *sge)
   {
           int off, space;
   
           space = (int)cm->cm_sc->facts->IOCRequestFrameSize * 4;
           off = (uintptr_t)sge - (uintptr_t)req;
   
           KASSERT(off < space, ("bad pointers %p %p, off %d, space %d",
               req, sge, off, space));
   
           cm->cm_sge = sge;
           cm->cm_sglsize = space - off;
   }
   
   /*
    * Prepare the mps_command for an IOC_FACTS request.
    */
   static int
   mpi_pre_ioc_facts(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_IOC_FACTS_REQUEST *req = (void *)cm->cm_req;
           MPI2_IOC_FACTS_REPLY *rpl;
   
           if (cmd->req_len != sizeof *req)
                   return (EINVAL);
           if (cmd->rpl_len != sizeof *rpl)
                   return (EINVAL);
   
           cm->cm_sge = NULL;
           cm->cm_sglsize = 0;
           return (0);
   }
   
   /*
    * Prepare the mps_command for a PORT_FACTS request.
    */
   static int
   mpi_pre_port_facts(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_PORT_FACTS_REQUEST *req = (void *)cm->cm_req;
           MPI2_PORT_FACTS_REPLY *rpl;
   
           if (cmd->req_len != sizeof *req)
                   return (EINVAL);
           if (cmd->rpl_len != sizeof *rpl)
                   return (EINVAL);
   
           cm->cm_sge = NULL;
           cm->cm_sglsize = 0;
           return (0);
   }
   
   /*
    * Prepare the mps_command for a FW_DOWNLOAD request.
    */
   static int
   mpi_pre_fw_download(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_FW_DOWNLOAD_REQUEST *req = (void *)cm->cm_req;
           MPI2_FW_DOWNLOAD_REPLY *rpl;
           MPI2_FW_DOWNLOAD_TCSGE tc;
           int error;
   
           /*
            * This code assumes there is room in the request's SGL for
            * the TransactionContext plus at least a SGL chain element.
            */
           CTASSERT(sizeof req->SGL >= sizeof tc + MPS_SGC_SIZE);
   
           if (cmd->req_len != sizeof *req)
                   return (EINVAL);
           if (cmd->rpl_len != sizeof *rpl)
                   return (EINVAL);
   
           if (cmd->len == 0)
                   return (EINVAL);
   
           error = copyin(cmd->buf, cm->cm_data, cmd->len);
           if (error != 0)
                   return (error);
   
           mpi_init_sge(cm, req, &req->SGL);
           bzero(&tc, sizeof tc);
   
           /*
            * For now, the F/W image must be provided in a single request.
            */
           if ((req->MsgFlags & MPI2_FW_DOWNLOAD_MSGFLGS_LAST_SEGMENT) == 0)
                   return (EINVAL);
           if (req->TotalImageSize != cmd->len)
                   return (EINVAL);
   
           /*
            * The value of the first two elements is specified in the
            * Fusion-MPT Message Passing Interface document.
            */
           tc.ContextSize = 0;
           tc.DetailsLength = 12;
           tc.ImageOffset = 0;
           tc.ImageSize = cmd->len;
   
           cm->cm_flags |= MPS_CM_FLAGS_DATAOUT;
   
           return (mps_push_sge(cm, &tc, sizeof tc, 0));
   }
   
   /*
    * Prepare the mps_command for a FW_UPLOAD request.
    */
   static int
   mpi_pre_fw_upload(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_FW_UPLOAD_REQUEST *req = (void *)cm->cm_req;
           MPI2_FW_UPLOAD_REPLY *rpl;
           MPI2_FW_UPLOAD_TCSGE tc;
   
           /*
            * This code assumes there is room in the request's SGL for
            * the TransactionContext plus at least a SGL chain element.
            */
           CTASSERT(sizeof req->SGL >= sizeof tc + MPS_SGC_SIZE);
   
           if (cmd->req_len != sizeof *req)
                   return (EINVAL);
           if (cmd->rpl_len != sizeof *rpl)
                   return (EINVAL);
   
           mpi_init_sge(cm, req, &req->SGL);
           bzero(&tc, sizeof tc);
   
           /*
            * The value of the first two elements is specified in the
            * Fusion-MPT Message Passing Interface document.
            */
           tc.ContextSize = 0;
           tc.DetailsLength = 12;
           /*
            * XXX Is there any reason to fetch a partial image?  I.e. to
            * set ImageOffset to something other than 0?
            */
           tc.ImageOffset = 0;
           tc.ImageSize = cmd->len;
   
           cm->cm_flags |= MPS_CM_FLAGS_DATAIN;
   
           return (mps_push_sge(cm, &tc, sizeof tc, 0));
   }
   
   /*
    * Prepare the mps_command for a SATA_PASSTHROUGH request.
    */
   static int
   mpi_pre_sata_passthrough(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_SATA_PASSTHROUGH_REQUEST *req = (void *)cm->cm_req;
           MPI2_SATA_PASSTHROUGH_REPLY *rpl;
   
           if (cmd->req_len != sizeof *req)
                   return (EINVAL);
           if (cmd->rpl_len != sizeof *rpl)
                   return (EINVAL);
   
           mpi_init_sge(cm, req, &req->SGL);
           return (0);
   }
   
   /*
    * Prepare the mps_command for a SMP_PASSTHROUGH request.
    */
   static int
   mpi_pre_smp_passthrough(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_SMP_PASSTHROUGH_REQUEST *req = (void *)cm->cm_req;
           MPI2_SMP_PASSTHROUGH_REPLY *rpl;
   
           if (cmd->req_len != sizeof *req)
                   return (EINVAL);
           if (cmd->rpl_len != sizeof *rpl)
                   return (EINVAL);
   
           mpi_init_sge(cm, req, &req->SGL);
           return (0);
   }
   
   /*
    * Prepare the mps_command for a CONFIG request.
    */
   static int
   mpi_pre_config(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_CONFIG_REQUEST *req = (void *)cm->cm_req;
           MPI2_CONFIG_REPLY *rpl;
   
           if (cmd->req_len != sizeof *req)
                   return (EINVAL);
           if (cmd->rpl_len != sizeof *rpl)
                   return (EINVAL);
   
           mpi_init_sge(cm, req, &req->PageBufferSGE);
           return (0);
   }
   
   /*
    * Prepare the mps_command for a SAS_IO_UNIT_CONTROL request.
    */
   static int
   mpi_pre_sas_io_unit_control(struct mps_command *cm,
                                struct mps_usr_command *cmd)
   {
   
           cm->cm_sge = NULL;
           cm->cm_sglsize = 0;
           return (0);
   }
   
   /*
    * A set of functions to prepare an mps_command for the various
    * supported requests.
    */
   struct mps_user_func {
           U8              Function;
           mps_user_f      *f_pre;
   } mps_user_func_list[] = {
           { MPI2_FUNCTION_IOC_FACTS,              mpi_pre_ioc_facts },
           { MPI2_FUNCTION_PORT_FACTS,             mpi_pre_port_facts },
           { MPI2_FUNCTION_FW_DOWNLOAD,            mpi_pre_fw_download },
           { MPI2_FUNCTION_FW_UPLOAD,              mpi_pre_fw_upload },
           { MPI2_FUNCTION_SATA_PASSTHROUGH,       mpi_pre_sata_passthrough },
           { MPI2_FUNCTION_SMP_PASSTHROUGH,        mpi_pre_smp_passthrough},
           { MPI2_FUNCTION_CONFIG,                 mpi_pre_config},
           { MPI2_FUNCTION_SAS_IO_UNIT_CONTROL,    mpi_pre_sas_io_unit_control },
           { 0xFF,                                 NULL } /* list end */
   };
   
   static int
   mps_user_setup_request(struct mps_command *cm, struct mps_usr_command *cmd)
   {
           MPI2_REQUEST_HEADER *hdr = (MPI2_REQUEST_HEADER *)cm->cm_req;
           struct mps_user_func *f;
   
           for (f = mps_user_func_list; f->f_pre != NULL; f++) {
                   if (hdr->Function == f->Function)
                           return (f->f_pre(cm, cmd));
           }
           return (EINVAL);
   }
   
   static int
   mps_user_command(struct mps_softc *sc, struct mps_usr_command *cmd)
   {
           MPI2_REQUEST_HEADER *hdr;
           MPI2_DEFAULT_REPLY *rpl;
           void *buf = NULL;
           struct mps_command *cm = NULL;
           int err = 0;
           int sz;
   
           mps_lock(sc);
           cm = mps_alloc_command(sc);
   
           if (cm == NULL) {
                   mps_printf(sc, "mps_user_command: no mps requests\n");
                   err = ENOMEM;
                   goto Ret;
           }
           mps_unlock(sc);
   
           hdr = (MPI2_REQUEST_HEADER *)cm->cm_req;
   
           mps_dprint(sc, MPS_INFO, "mps_user_command: req %p %d  rpl %p %d\n",
                       cmd->req, cmd->req_len, cmd->rpl, cmd->rpl_len );
   
           if (cmd->req_len > (int)sc->facts->IOCRequestFrameSize * 4) {
                   err = EINVAL;
                   goto RetFreeUnlocked;
           }
           err = copyin(cmd->req, hdr, cmd->req_len);
           if (err != 0)
                   goto RetFreeUnlocked;
   
           mps_dprint(sc, MPS_INFO, "mps_user_command: Function %02X  "
               "MsgFlags %02X\n", hdr->Function, hdr->MsgFlags );
   
           if (cmd->len > 0) {
                   buf = kmalloc(cmd->len, M_MPSUSER, M_WAITOK|M_ZERO);
                   cm->cm_data = buf;
                   cm->cm_length = cmd->len;
           } else {
                   cm->cm_data = NULL;
                   cm->cm_length = 0;
           }
   
           cm->cm_flags = MPS_CM_FLAGS_SGE_SIMPLE;
           cm->cm_desc.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
   
           err = mps_user_setup_request(cm, cmd);
           if (err != 0) {
                   mps_printf(sc, "mps_user_command: unsupported function 0x%X\n",
                              hdr->Function );
                   goto RetFreeUnlocked;
           }
   
           mps_lock(sc);
           err = mps_wait_command(sc, cm, 60);
   
           if (err) {
                   mps_printf(sc, "%s: invalid request: error %d\n",
                       __func__, err);
                   goto Ret;
           }
   
           rpl = (MPI2_DEFAULT_REPLY *)cm->cm_reply;
           if (rpl != NULL)
                   sz = rpl->MsgLength * 4;
           else
                   sz = 0;
   
           if (sz > cmd->rpl_len) {
                   mps_printf(sc,
                       "mps_user_command: reply buffer too small %d required %d\n",
                       cmd->rpl_len, sz );
                   err = EINVAL;
                   sz = cmd->rpl_len;
           }
   
           mps_unlock(sc);
           copyout(rpl, cmd->rpl, sz);
           if (buf != NULL)
                   copyout(buf, cmd->buf, cmd->len);
           mps_dprint(sc, MPS_INFO, "mps_user_command: reply size %d\n", sz );
   
   RetFreeUnlocked:
           mps_lock(sc);
           if (cm != NULL)
                   mps_free_command(sc, cm);
   Ret:
           mps_unlock(sc);
           if (buf != NULL)
                   kfree(buf, M_MPSUSER);
           return (err);
   }
   
   static int
   mps_user_pass_thru(struct mps_softc *sc, mps_pass_thru_t *data)
   {
           MPI2_REQUEST_HEADER     *hdr, tmphdr;
           MPI2_DEFAULT_REPLY      *rpl;
           struct mps_command      *cm = NULL;
           int                     err = 0, dir = 0, sz;
           uint8_t                 function = 0;
           u_int                   sense_len;
   
           /*
            * Only allow one passthru command at a time.  Use the MPS_FLAGS_BUSY
            * bit to denote that a passthru is being processed.
            */
           mps_lock(sc);
           if (sc->mps_flags & MPS_FLAGS_BUSY) {
                   mps_dprint(sc, MPS_INFO, "%s: Only one passthru command "
                       "allowed at a single time.", __func__);
                   mps_unlock(sc);
                   return (EBUSY);
           }
           sc->mps_flags |= MPS_FLAGS_BUSY;
           mps_unlock(sc);
   
           /*
            * Do some validation on data direction.  Valid cases are:
            *    1) DataSize is 0 and direction is NONE
            *    2) DataSize is non-zero and one of:
            *        a) direction is READ or
            *        b) direction is WRITE or
            *        c) direction is BOTH and DataOutSize is non-zero
            * If valid and the direction is BOTH, change the direction to READ.
            * if valid and the direction is not BOTH, make sure DataOutSize is 0.
            */
           if (((data->DataSize == 0) &&
               (data->DataDirection == MPS_PASS_THRU_DIRECTION_NONE)) ||
               ((data->DataSize != 0) &&
               ((data->DataDirection == MPS_PASS_THRU_DIRECTION_READ) ||
               (data->DataDirection == MPS_PASS_THRU_DIRECTION_WRITE) ||
               ((data->DataDirection == MPS_PASS_THRU_DIRECTION_BOTH) &&
               (data->DataOutSize != 0))))) {
                   if (data->DataDirection == MPS_PASS_THRU_DIRECTION_BOTH)
                           data->DataDirection = MPS_PASS_THRU_DIRECTION_READ;
                   else
                           data->DataOutSize = 0;
           } else
                   return (EINVAL);
   
           mps_dprint(sc, MPS_INFO, "%s: req 0x%jx %d  rpl 0x%jx %d "
               "data in 0x%jx %d data out 0x%jx %d data dir %d\n", __func__,
               data->PtrRequest, data->RequestSize, data->PtrReply,
               data->ReplySize, data->PtrData, data->DataSize,
               data->PtrDataOut, data->DataOutSize, data->DataDirection);
   
           /*
            * copy in the header so we know what we're dealing with before we
            * commit to allocating a command for it.
            */
           err = copyin(PTRIN(data->PtrRequest), &tmphdr, data->RequestSize);
           if (err != 0)
                   goto RetFreeUnlocked;
   
           if (data->RequestSize > (int)sc->facts->IOCRequestFrameSize * 4) {
                   err = EINVAL;
                   goto RetFreeUnlocked;
           }
   
           function = tmphdr.Function;
           mps_dprint(sc, MPS_INFO, "%s: Function %02X MsgFlags %02X\n", __func__,
               function, tmphdr.MsgFlags);
   
           /*
            * Handle a passthru TM request.
            */
           if (function == MPI2_FUNCTION_SCSI_TASK_MGMT) {
                   MPI2_SCSI_TASK_MANAGE_REQUEST   *task;
   
                   mps_lock(sc);
                   cm = mpssas_alloc_tm(sc);
                   if (cm == NULL) {
                           err = EINVAL;
                           goto Ret;
                   }
   
                   /* Copy the header in.  Only a small fixup is needed. */
                   task = (MPI2_SCSI_TASK_MANAGE_REQUEST *)cm->cm_req;
                   bcopy(&tmphdr, task, data->RequestSize);
                   task->TaskMID = cm->cm_desc.Default.SMID;
   
                   cm->cm_data = NULL;
                   cm->cm_desc.HighPriority.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY;
                   cm->cm_complete = NULL;
                   cm->cm_complete_data = NULL;
   
                   err = mps_wait_command(sc, cm, 30);
   
                   if (err != 0) {
                           err = EIO;
                           mps_dprint(sc, MPS_FAULT, "%s: task management failed",
                               __func__);
                   }
                   /*
                    * Copy the reply data and sense data to user space.
                    */
                   if (cm->cm_reply != NULL) {
                           rpl = (MPI2_DEFAULT_REPLY *)cm->cm_reply;
                           sz = rpl->MsgLength * 4;
   
                           if (sz > data->ReplySize) {
                                   mps_printf(sc, "%s: reply buffer too small: %d, "
                                       "required: %d\n", __func__, data->ReplySize, sz);
                                   err = EINVAL;
                           } else {
                                   mps_unlock(sc);
                                   copyout(cm->cm_reply, PTRIN(data->PtrReply),
                                       data->ReplySize);
                                   mps_lock(sc);
                           }
                   }
                   mpssas_free_tm(sc, cm);
                   goto Ret;
           }
   
           mps_lock(sc);
           cm = mps_alloc_command(sc);
   
           if (cm == NULL) {
                   mps_printf(sc, "%s: no mps requests\n", __func__);
                   err = ENOMEM;
                   goto Ret;
           }
           mps_unlock(sc);
   
           hdr = (MPI2_REQUEST_HEADER *)cm->cm_req;
           bcopy(&tmphdr, hdr, data->RequestSize);
   
           /*
            * Do some checking to make sure the IOCTL request contains a valid
            * request.  Then set the SGL info.
            */
           mpi_init_sge(cm, hdr, (void *)((uint8_t *)hdr + data->RequestSize));
   
           /*
            * Set up for read, write or both.  From check above, DataOutSize will
            * be 0 if direction is READ or WRITE, but it will have some non-zero
            * value if the direction is BOTH.  So, just use the biggest size to get
            * the cm_data buffer size.  If direction is BOTH, 2 SGLs need to be set
            * up; the first is for the request and the second will contain the
            * response data. cm_out_len needs to be set here and this will be used
            * when the SGLs are set up.
            */
           cm->cm_data = NULL;
           cm->cm_length = MAX(data->DataSize, data->DataOutSize);
           cm->cm_out_len = data->DataOutSize;
           cm->cm_flags = 0;
           if (cm->cm_length != 0) {
                   cm->cm_data = kmalloc(cm->cm_length, M_MPSUSER, M_WAITOK |
                       M_ZERO);
                   if (cm->cm_data == NULL) {
                           mps_dprint(sc, MPS_FAULT, "%s: alloc failed for IOCTL "
                               "passthru length %d\n", __func__, cm->cm_length);
                   } else {
                           cm->cm_flags = MPS_CM_FLAGS_DATAIN;
                           if (data->DataOutSize) {
                                   cm->cm_flags |= MPS_CM_FLAGS_DATAOUT;
                                   err = copyin(PTRIN(data->PtrDataOut),
                                       cm->cm_data, data->DataOutSize);
                           } else if (data->DataDirection ==
                               MPS_PASS_THRU_DIRECTION_WRITE) {
                                   cm->cm_flags = MPS_CM_FLAGS_DATAOUT;
                                   err = copyin(PTRIN(data->PtrData),
                                       cm->cm_data, data->DataSize);
                           }
                           if (err != 0)
                                   mps_dprint(sc, MPS_FAULT, "%s: failed to copy "
                                       "IOCTL data from user space\n", __func__);
                   }
           }
           cm->cm_flags |= MPS_CM_FLAGS_SGE_SIMPLE;
           cm->cm_desc.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
   
           /*
            * Set up Sense buffer and SGL offset for IO passthru.  SCSI IO request
            * uses SCSI IO descriptor.
            */
           if ((function == MPI2_FUNCTION_SCSI_IO_REQUEST) ||
               (function == MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH)) {
                   MPI2_SCSI_IO_REQUEST    *scsi_io_req;
   
                   scsi_io_req = (MPI2_SCSI_IO_REQUEST *)hdr;
                   /*
                    * Put SGE for data and data_out buffer at the end of
                    * scsi_io_request message header (64 bytes in total).
                    * Following above SGEs, the residual space will be used by
                    * sense data.
                    */
                   scsi_io_req->SenseBufferLength = (uint8_t)(data->RequestSize -
                       64);
                   scsi_io_req->SenseBufferLowAddress = cm->cm_sense_busaddr;
   
                   /*
                    * Set SGLOffset0 value.  This is the number of dwords that SGL
                    * is offset from the beginning of MPI2_SCSI_IO_REQUEST struct.
                    */
                   scsi_io_req->SGLOffset0 = 24;
   
                   /*
                    * Setup descriptor info.  RAID passthrough must use the
                    * default request descriptor which is already set, so if this
                    * is a SCSI IO request, change the descriptor to SCSI IO.
                    * Also, if this is a SCSI IO request, handle the reply in the
                    * mpssas_scsio_complete function.
                    */
                   if (function == MPI2_FUNCTION_SCSI_IO_REQUEST) {
                           cm->cm_desc.SCSIIO.RequestFlags =
                               MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO;
                           cm->cm_desc.SCSIIO.DevHandle = scsi_io_req->DevHandle;
   
                           /*
                            * Make sure the DevHandle is not 0 because this is a
                            * likely error.
                            */
                           if (scsi_io_req->DevHandle == 0) {
                                   err = EINVAL;
                                   goto RetFreeUnlocked;
                           }
                   }
           }
   
           mps_lock(sc);
   
           err = mps_wait_command(sc, cm, 30);
   
           if (err) {
                   mps_printf(sc, "%s: invalid request: error %d\n", __func__,
                       err);
                   mps_unlock(sc);
                   goto RetFreeUnlocked;
           }
   
           /*
            * Sync the DMA data, if any.  Then copy the data to user space.
            */
           if (cm->cm_data != NULL) {
                   if (cm->cm_flags & MPS_CM_FLAGS_DATAIN)
                           dir = BUS_DMASYNC_POSTREAD;
                   else if (cm->cm_flags & MPS_CM_FLAGS_DATAOUT)
                           dir = BUS_DMASYNC_POSTWRITE;
                   bus_dmamap_sync(sc->buffer_dmat, cm->cm_dmamap, dir);
                   bus_dmamap_unload(sc->buffer_dmat, cm->cm_dmamap);
   
                   if (cm->cm_flags & MPS_CM_FLAGS_DATAIN) {
                           mps_unlock(sc);
                          err = copyout(cm->cm_data,
                              PTRIN(data->PtrData), data->DataSize);
                          mps_lock(sc);
                          if (err != 0)
                                  mps_dprint(sc, MPS_FAULT, "%s: failed to copy "
                                      "IOCTL data to user space\n", __func__);
                  }
          }
  
          /*
           * Copy the reply data and sense data to user space.
           */
          if (cm->cm_reply != NULL) {
                  rpl = (MPI2_DEFAULT_REPLY *)cm->cm_reply;
                  sz = rpl->MsgLength * 4;
  
                  if (sz > data->ReplySize) {
                          mps_printf(sc, "%s: reply buffer too small: %d, "
                              "required: %d\n", __func__, data->ReplySize, sz);
                          err = EINVAL;
                  } else {
                          mps_unlock(sc);
                          copyout(cm->cm_reply, PTRIN(data->PtrReply),
                              data->ReplySize);
                          mps_lock(sc);
                  }
  
                  if ((function == MPI2_FUNCTION_SCSI_IO_REQUEST) ||
                      (function == MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH)) {
                          if (((MPI2_SCSI_IO_REPLY *)rpl)->SCSIState &
                              MPI2_SCSI_STATE_AUTOSENSE_VALID) {
                                  sense_len =
                                      MIN(((MPI2_SCSI_IO_REPLY *)rpl)->SenseCount,
                                      sizeof(struct scsi_sense_data));
                                  mps_unlock(sc);
                                  copyout(cm->cm_sense, cm->cm_req + 64, sense_len);
                                  mps_lock(sc);
                          }
                  }
          }
          mps_unlock(sc);
  
  RetFreeUnlocked:
          mps_lock(sc);
  
          if (cm != NULL) {
                  if (cm->cm_data)
                          kfree(cm->cm_data, M_MPSUSER);
                  mps_free_command(sc, cm);
          }
  Ret:
          sc->mps_flags &= ~MPS_FLAGS_BUSY;
          mps_unlock(sc);
  
          return (err);
  }
  
  static void
  mps_user_get_adapter_data(struct mps_softc *sc, mps_adapter_data_t *data)
  {
          Mpi2ConfigReply_t       mpi_reply;
          Mpi2BiosPage3_t         config_page;
  
          /*
           * Use the PCI interface functions to get the Bus, Device, and Function
           * information.
           */
          data->PciInformation.u.bits.BusNumber = pci_get_bus(sc->mps_dev);
          data->PciInformation.u.bits.DeviceNumber = pci_get_slot(sc->mps_dev);
          data->PciInformation.u.bits.FunctionNumber =
              pci_get_function(sc->mps_dev);
  
          /*
           * Get the FW version that should already be saved in IOC Facts.
           */
          data->MpiFirmwareVersion = sc->facts->FWVersion.Word;
  
          /*
           * General device info.
           */
          data->AdapterType = MPSIOCTL_ADAPTER_TYPE_SAS2;
          if (sc->mps_flags & MPS_FLAGS_WD_AVAILABLE)
                  data->AdapterType = MPSIOCTL_ADAPTER_TYPE_SAS2_SSS6200;
          data->PCIDeviceHwId = pci_get_device(sc->mps_dev);
          data->PCIDeviceHwRev = pci_read_config(sc->mps_dev, PCIR_REVID, 1);
          data->SubSystemId = pci_get_subdevice(sc->mps_dev);
          data->SubsystemVendorId = pci_get_subvendor(sc->mps_dev);
  
          /*
           * Get the driver version.
           */
          strcpy((char *)&data->DriverVersion[0], MPS_DRIVER_VERSION);
  
          /*
           * Need to get BIOS Config Page 3 for the BIOS Version.
           */
          data->BiosVersion = 0;
          mps_lock(sc);
          if (mps_config_get_bios_pg3(sc, &mpi_reply, &config_page))
                  kprintf("%s: Error while retrieving BIOS Version\n", __func__);
          else
                  data->BiosVersion = config_page.BiosVersion;
          mps_unlock(sc);
  }
  
  static void
  mps_user_read_pci_info(struct mps_softc *sc, mps_pci_info_t *data)
  {
          int     i;
  
          /*
           * Use the PCI interface functions to get the Bus, Device, and Function
           * information.
           */
          data->BusNumber = pci_get_bus(sc->mps_dev);
          data->DeviceNumber = pci_get_slot(sc->mps_dev);
          data->FunctionNumber = pci_get_function(sc->mps_dev);
  
          /*
           * Now get the interrupt vector and the pci header.  The vector can
           * only be 0 right now.  The header is the first 256 bytes of config
           * space.
           */
          data->InterruptVector = 0;
          for (i = 0; i < sizeof (data->PciHeader); i++) {
                  data->PciHeader[i] = pci_read_config(sc->mps_dev, i, 1);
          }
  }
  
  static uint8_t
  mps_get_fw_diag_buffer_number(struct mps_softc *sc, uint32_t unique_id)
  {
          uint8_t index;
  
          for (index = 0; index < MPI2_DIAG_BUF_TYPE_COUNT; index++) {
                  if (sc->fw_diag_buffer_list[index].unique_id == unique_id) {
                          return (index);
                  }
          }
  
          return (MPS_FW_DIAGNOSTIC_UID_NOT_FOUND);
  }
  
  static int
  mps_post_fw_diag_buffer(struct mps_softc *sc,
      mps_fw_diagnostic_buffer_t *pBuffer, uint32_t *return_code)
  {
          MPI2_DIAG_BUFFER_POST_REQUEST   *req;
          MPI2_DIAG_BUFFER_POST_REPLY     *reply;
          struct mps_command              *cm = NULL;
          int                             i, status;
  
          /*
           * If buffer is not enabled, just leave.
           */
          *return_code = MPS_FW_DIAG_ERROR_POST_FAILED;
          if (!pBuffer->enabled) {
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * Clear some flags initially.
           */
          pBuffer->force_release = FALSE;
          pBuffer->valid_data = FALSE;
          pBuffer->owned_by_firmware = FALSE;
  
          /*
           * Get a command.
           */
          cm = mps_alloc_command(sc);
          if (cm == NULL) {
                  mps_printf(sc, "%s: no mps requests\n", __func__);
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * Build the request for releasing the FW Diag Buffer and send it.
           */
          req = (MPI2_DIAG_BUFFER_POST_REQUEST *)cm->cm_req;
          req->Function = MPI2_FUNCTION_DIAG_BUFFER_POST;
          req->BufferType = pBuffer->buffer_type;
          req->ExtendedType = pBuffer->extended_type;
          req->BufferLength = pBuffer->size;
          for (i = 0; i < (sizeof(req->ProductSpecific) / 4); i++)
                  req->ProductSpecific[i] = pBuffer->product_specific[i];
          mps_from_u64(sc->fw_diag_busaddr, &req->BufferAddress);
          cm->cm_data = NULL;
          cm->cm_length = 0;
          cm->cm_desc.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
          cm->cm_complete_data = NULL;
  
          /*
           * Send command synchronously.
           */
          status = mps_wait_command(sc, cm, 30);
          if (status) {
                  mps_printf(sc, "%s: invalid request: error %d\n", __func__,
                      status);
                  status = MPS_DIAG_FAILURE;
                  goto done;
          }
  
          /*
           * Process POST reply.
           */
          reply = (MPI2_DIAG_BUFFER_POST_REPLY *)cm->cm_reply;
          if (reply->IOCStatus != MPI2_IOCSTATUS_SUCCESS) {
                  status = MPS_DIAG_FAILURE;
                  mps_dprint(sc, MPS_FAULT, "%s: post of FW  Diag Buffer failed "
                      "with IOCStatus = 0x%x, IOCLogInfo = 0x%x and "
                      "TransferLength = 0x%x\n", __func__, reply->IOCStatus,
                      reply->IOCLogInfo, reply->TransferLength);
                  goto done;
          }
  
          /*
           * Post was successful.
           */
          pBuffer->valid_data = TRUE;
          pBuffer->owned_by_firmware = TRUE;
          *return_code = MPS_FW_DIAG_ERROR_SUCCESS;
          status = MPS_DIAG_SUCCESS;
  
  done:
          mps_free_command(sc, cm);
          return (status);
  }
  
  static int
  mps_release_fw_diag_buffer(struct mps_softc *sc,
      mps_fw_diagnostic_buffer_t *pBuffer, uint32_t *return_code,
      uint32_t diag_type)
  {
          MPI2_DIAG_RELEASE_REQUEST       *req;
          MPI2_DIAG_RELEASE_REPLY         *reply;
          struct mps_command              *cm = NULL;
          int                             status;
  
          /*
           * If buffer is not enabled, just leave.
           */
          *return_code = MPS_FW_DIAG_ERROR_RELEASE_FAILED;
          if (!pBuffer->enabled) {
                  mps_dprint(sc, MPS_INFO, "%s: This buffer type is not supported "
                      "by the IOC", __func__);
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * Clear some flags initially.
           */
          pBuffer->force_release = FALSE;
          pBuffer->valid_data = FALSE;
          pBuffer->owned_by_firmware = FALSE;
  
          /*
           * Get a command.
           */
          cm = mps_alloc_command(sc);
          if (cm == NULL) {
                  mps_printf(sc, "%s: no mps requests\n", __func__);
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * Build the request for releasing the FW Diag Buffer and send it.
           */
          req = (MPI2_DIAG_RELEASE_REQUEST *)cm->cm_req;
          req->Function = MPI2_FUNCTION_DIAG_RELEASE;
          req->BufferType = pBuffer->buffer_type;
          cm->cm_data = NULL;
          cm->cm_length = 0;
          cm->cm_desc.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
          cm->cm_complete_data = NULL;
  
          /*
           * Send command synchronously.
           */
          status = mps_wait_command(sc, cm, 30);
          if (status) {
                  mps_printf(sc, "%s: invalid request: error %d\n", __func__,
                      status);
                  status = MPS_DIAG_FAILURE;
                  goto done;
          }
  
          /*
           * Process RELEASE reply.
           */
          reply = (MPI2_DIAG_RELEASE_REPLY *)cm->cm_reply;
          if ((reply->IOCStatus != MPI2_IOCSTATUS_SUCCESS) ||
              pBuffer->owned_by_firmware) {
                  status = MPS_DIAG_FAILURE;
                  mps_dprint(sc, MPS_FAULT, "%s: release of FW Diag Buffer "
                      "failed with IOCStatus = 0x%x and IOCLogInfo = 0x%x\n",
                      __func__, reply->IOCStatus, reply->IOCLogInfo);
                  goto done;
          }
  
          /*
           * Release was successful.
           */
          *return_code = MPS_FW_DIAG_ERROR_SUCCESS;
          status = MPS_DIAG_SUCCESS;
  
          /*
           * If this was for an UNREGISTER diag type command, clear the unique ID.
           */
          if (diag_type == MPS_FW_DIAG_TYPE_UNREGISTER) {
                  pBuffer->unique_id = MPS_FW_DIAG_INVALID_UID;
          }
  
  done:
          return (status);
  }
  
  static int
  mps_diag_register(struct mps_softc *sc, mps_fw_diag_register_t *diag_register,
      uint32_t *return_code)
  {
          mps_fw_diagnostic_buffer_t      *pBuffer;
          uint8_t                         extended_type, buffer_type, i;
          uint32_t                        buffer_size;
          uint32_t                        unique_id;
          int                             status;
  
          extended_type = diag_register->ExtendedType;
          buffer_type = diag_register->BufferType;
          buffer_size = diag_register->RequestedBufferSize;
          unique_id = diag_register->UniqueId;
  
          /*
           * Check for valid buffer type
           */
          if (buffer_type >= MPI2_DIAG_BUF_TYPE_COUNT) {
                  *return_code = MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * Get the current buffer and look up the unique ID.  The unique ID
           * should not be found.  If it is, the ID is already in use.
           */
          i = mps_get_fw_diag_buffer_number(sc, unique_id);
          pBuffer = &sc->fw_diag_buffer_list[buffer_type];
          if (i != MPS_FW_DIAGNOSTIC_UID_NOT_FOUND) {
                  *return_code = MPS_FW_DIAG_ERROR_INVALID_UID;
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * The buffer's unique ID should not be registered yet, and the given
           * unique ID cannot be 0.
           */
          if ((pBuffer->unique_id != MPS_FW_DIAG_INVALID_UID) ||
              (unique_id == MPS_FW_DIAG_INVALID_UID)) {
                  *return_code = MPS_FW_DIAG_ERROR_INVALID_UID;
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * If this buffer is already posted as immediate, just change owner.
           */
          if (pBuffer->immediate && pBuffer->owned_by_firmware &&
              (pBuffer->unique_id == MPS_FW_DIAG_INVALID_UID)) {
                  pBuffer->immediate = FALSE;
                  pBuffer->unique_id = unique_id;
                  return (MPS_DIAG_SUCCESS);
          }
  
          /*
           * Post a new buffer after checking if it's enabled.  The DMA buffer
           * that is allocated will be contiguous (nsegments = 1).
           */
          if (!pBuffer->enabled) {
                  *return_code = MPS_FW_DIAG_ERROR_NO_BUFFER;
                  return (MPS_DIAG_FAILURE);
          }
          if (bus_dma_tag_create( sc->mps_parent_dmat,    /* parent */
                                  1, 0,                   /* algnmnt, boundary */
                                  BUS_SPACE_MAXADDR_32BIT,/* lowaddr */
                                  BUS_SPACE_MAXADDR,      /* highaddr */
                                  NULL, NULL,             /* filter, filterarg */
                                  buffer_size,            /* maxsize */
                                  1,                      /* nsegments */
                                  buffer_size,            /* maxsegsize */
                                  0,                      /* flags */
                                  &sc->fw_diag_dmat)) {
                  device_printf(sc->mps_dev, "Cannot allocate FW diag buffer DMA "
                      "tag\n");
                  return (ENOMEM);
          }
          if (bus_dmamem_alloc(sc->fw_diag_dmat, (void **)&sc->fw_diag_buffer,
              BUS_DMA_NOWAIT, &sc->fw_diag_map)) {
                  device_printf(sc->mps_dev, "Cannot allocate FW diag buffer "
                      "memory\n");
                  return (ENOMEM);
          }
          bzero(sc->fw_diag_buffer, buffer_size);
          bus_dmamap_load(sc->fw_diag_dmat, sc->fw_diag_map, sc->fw_diag_buffer,
              buffer_size, mps_memaddr_cb, &sc->fw_diag_busaddr, 0);
          pBuffer->size = buffer_size;
  
          /*
           * Copy the given info to the diag buffer and post the buffer.
           */
          pBuffer->buffer_type = buffer_type;
          pBuffer->immediate = FALSE;
          if (buffer_type == MPI2_DIAG_BUF_TYPE_TRACE) {
                  for (i = 0; i < (sizeof (pBuffer->product_specific) / 4);
                      i++) {
                          pBuffer->product_specific[i] =
                              diag_register->ProductSpecific[i];
                  }
          }
          pBuffer->extended_type = extended_type;
          pBuffer->unique_id = unique_id;
          status = mps_post_fw_diag_buffer(sc, pBuffer, return_code);
  
          /*
           * In case there was a failure, free the DMA buffer.
           */
          if (status == MPS_DIAG_FAILURE) {
                  if (sc->fw_diag_busaddr != 0)
                          bus_dmamap_unload(sc->fw_diag_dmat, sc->fw_diag_map);
                  if (sc->fw_diag_buffer != NULL)
                          bus_dmamem_free(sc->fw_diag_dmat, sc->fw_diag_buffer,
                              sc->fw_diag_map);
                  if (sc->fw_diag_dmat != NULL)
                          bus_dma_tag_destroy(sc->fw_diag_dmat);
          }
  
          return (status);
  }
  
  static int
  mps_diag_unregister(struct mps_softc *sc,
      mps_fw_diag_unregister_t *diag_unregister, uint32_t *return_code)
  {
          mps_fw_diagnostic_buffer_t      *pBuffer;
          uint8_t                         i;
          uint32_t                        unique_id;
          int                             status;
  
          unique_id = diag_unregister->UniqueId;
  
          /*
           * Get the current buffer and look up the unique ID.  The unique ID
           * should be there.
           */
          i = mps_get_fw_diag_buffer_number(sc, unique_id);
          if (i == MPS_FW_DIAGNOSTIC_UID_NOT_FOUND) {
                  *return_code = MPS_FW_DIAG_ERROR_INVALID_UID;
                  return (MPS_DIAG_FAILURE);
          }
  
          pBuffer = &sc->fw_diag_buffer_list[i];
  
          /*
           * Try to release the buffer from FW before freeing it.  If release
           * fails, don't free the DMA buffer in case FW tries to access it
           * later.  If buffer is not owned by firmware, can't release it.
           */
          if (!pBuffer->owned_by_firmware) {
                  status = MPS_DIAG_SUCCESS;
          } else {
                  status = mps_release_fw_diag_buffer(sc, pBuffer, return_code,
                      MPS_FW_DIAG_TYPE_UNREGISTER);
          }
  
          /*
           * At this point, return the current status no matter what happens with
           * the DMA buffer.
           */
          pBuffer->unique_id = MPS_FW_DIAG_INVALID_UID;
          if (status == MPS_DIAG_SUCCESS) {
                  if (sc->fw_diag_busaddr != 0)
                          bus_dmamap_unload(sc->fw_diag_dmat, sc->fw_diag_map);
                  if (sc->fw_diag_buffer != NULL)
                          bus_dmamem_free(sc->fw_diag_dmat, sc->fw_diag_buffer,
                              sc->fw_diag_map);
                  if (sc->fw_diag_dmat != NULL)
                          bus_dma_tag_destroy(sc->fw_diag_dmat);
          }
  
          return (status);
  }
  
  static int
  mps_diag_query(struct mps_softc *sc, mps_fw_diag_query_t *diag_query,
      uint32_t *return_code)
  {
          mps_fw_diagnostic_buffer_t      *pBuffer;
          uint8_t                         i;
          uint32_t                        unique_id;
  
          unique_id = diag_query->UniqueId;
  
          /*
           * If ID is valid, query on ID.
           * If ID is invalid, query on buffer type.
           */
          if (unique_id == MPS_FW_DIAG_INVALID_UID) {
                  i = diag_query->BufferType;
                  if (i >= MPI2_DIAG_BUF_TYPE_COUNT) {
                          *return_code = MPS_FW_DIAG_ERROR_INVALID_UID;
                          return (MPS_DIAG_FAILURE);
                  }
          } else {
                  i = mps_get_fw_diag_buffer_number(sc, unique_id);
                  if (i == MPS_FW_DIAGNOSTIC_UID_NOT_FOUND) {
                          *return_code = MPS_FW_DIAG_ERROR_INVALID_UID;
                          return (MPS_DIAG_FAILURE);
                  }
          }
  
          /*
           * Fill query structure with the diag buffer info.
           */
          pBuffer = &sc->fw_diag_buffer_list[i];
          diag_query->BufferType = pBuffer->buffer_type;
          diag_query->ExtendedType = pBuffer->extended_type;
          if (diag_query->BufferType == MPI2_DIAG_BUF_TYPE_TRACE) {
                  for (i = 0; i < (sizeof(diag_query->ProductSpecific) / 4);
                      i++) {
                          diag_query->ProductSpecific[i] =
                              pBuffer->product_specific[i];
                  }
          }
          diag_query->TotalBufferSize = pBuffer->size;
          diag_query->DriverAddedBufferSize = 0;
          diag_query->UniqueId = pBuffer->unique_id;
          diag_query->ApplicationFlags = 0;
          diag_query->DiagnosticFlags = 0;
  
          /*
           * Set/Clear application flags
           */
          if (pBuffer->immediate) {
                  diag_query->ApplicationFlags &= ~MPS_FW_DIAG_FLAG_APP_OWNED;
          } else {
                  diag_query->ApplicationFlags |= MPS_FW_DIAG_FLAG_APP_OWNED;
          }
          if (pBuffer->valid_data || pBuffer->owned_by_firmware) {
                  diag_query->ApplicationFlags |= MPS_FW_DIAG_FLAG_BUFFER_VALID;
          } else {
                  diag_query->ApplicationFlags &= ~MPS_FW_DIAG_FLAG_BUFFER_VALID;
          }
          if (pBuffer->owned_by_firmware) {
                  diag_query->ApplicationFlags |=
                      MPS_FW_DIAG_FLAG_FW_BUFFER_ACCESS;
          } else {
                  diag_query->ApplicationFlags &=
                      ~MPS_FW_DIAG_FLAG_FW_BUFFER_ACCESS;
          }
  
          return (MPS_DIAG_SUCCESS);
  }
  
  static int
  mps_diag_read_buffer(struct mps_softc *sc,
      mps_diag_read_buffer_t *diag_read_buffer, uint8_t *ioctl_buf,
      uint32_t *return_code)
  {
          mps_fw_diagnostic_buffer_t      *pBuffer;
          uint8_t                         i, *pData;
          uint32_t                        unique_id;
          int                             status;
  
          unique_id = diag_read_buffer->UniqueId;
  
          /*
           * Get the current buffer and look up the unique ID.  The unique ID
           * should be there.
           */
          i = mps_get_fw_diag_buffer_number(sc, unique_id);
          if (i == MPS_FW_DIAGNOSTIC_UID_NOT_FOUND) {
                  *return_code = MPS_FW_DIAG_ERROR_INVALID_UID;
                  return (MPS_DIAG_FAILURE);
          }
  
          pBuffer = &sc->fw_diag_buffer_list[i];
  
          /*
           * Make sure requested read is within limits
           */
          if (diag_read_buffer->StartingOffset + diag_read_buffer->BytesToRead >
              pBuffer->size) {
                  *return_code = MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * Copy the requested data from DMA to the diag_read_buffer.  The DMA
           * buffer that was allocated is one contiguous buffer.
           */
          pData = (uint8_t *)(sc->fw_diag_buffer +
              diag_read_buffer->StartingOffset);
          if (copyout(pData, ioctl_buf, diag_read_buffer->BytesToRead) != 0)
                  return (MPS_DIAG_FAILURE);
          diag_read_buffer->Status = 0;
  
          /*
           * Set or clear the Force Release flag.
           */
          if (pBuffer->force_release) {
                  diag_read_buffer->Flags |= MPS_FW_DIAG_FLAG_FORCE_RELEASE;
          } else {
                  diag_read_buffer->Flags &= ~MPS_FW_DIAG_FLAG_FORCE_RELEASE;
          }
  
          /*
           * If buffer is to be reregistered, make sure it's not already owned by
           * firmware first.
           */
          status = MPS_DIAG_SUCCESS;
          if (!pBuffer->owned_by_firmware) {
                  if (diag_read_buffer->Flags & MPS_FW_DIAG_FLAG_REREGISTER) {
                          status = mps_post_fw_diag_buffer(sc, pBuffer,
                              return_code);
                  }
          }
  
          return (status);
  }
  
  static int
  mps_diag_release(struct mps_softc *sc, mps_fw_diag_release_t *diag_release,
      uint32_t *return_code)
  {
          mps_fw_diagnostic_buffer_t      *pBuffer;
          uint8_t                         i;
          uint32_t                        unique_id;
          int                             status;
  
          unique_id = diag_release->UniqueId;
  
          /*
           * Get the current buffer and look up the unique ID.  The unique ID
           * should be there.
           */
          i = mps_get_fw_diag_buffer_number(sc, unique_id);
          if (i == MPS_FW_DIAGNOSTIC_UID_NOT_FOUND) {
                  *return_code = MPS_FW_DIAG_ERROR_INVALID_UID;
                  return (MPS_DIAG_FAILURE);
          }
  
          pBuffer = &sc->fw_diag_buffer_list[i];
  
          /*
           * If buffer is not owned by firmware, it's already been released.
           */
          if (!pBuffer->owned_by_firmware) {
                  *return_code = MPS_FW_DIAG_ERROR_ALREADY_RELEASED;
                  return (MPS_DIAG_FAILURE);
          }
  
          /*
           * Release the buffer.
           */
          status = mps_release_fw_diag_buffer(sc, pBuffer, return_code,
              MPS_FW_DIAG_TYPE_RELEASE);
          return (status);
  }
  
  static int
  mps_do_diag_action(struct mps_softc *sc, uint32_t action, uint8_t *diag_action,
      uint32_t length, uint32_t *return_code)
  {
          mps_fw_diag_register_t          diag_register;
          mps_fw_diag_unregister_t        diag_unregister;
          mps_fw_diag_query_t             diag_query;
          mps_diag_read_buffer_t          diag_read_buffer;
          mps_fw_diag_release_t           diag_release;
          int                             status = MPS_DIAG_SUCCESS;
          uint32_t                        original_return_code;
  
          original_return_code = *return_code;
          *return_code = MPS_FW_DIAG_ERROR_SUCCESS;
  
          switch (action) {
                  case MPS_FW_DIAG_TYPE_REGISTER:
                          if (!length) {
                                  *return_code =
                                      MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                                  status = MPS_DIAG_FAILURE;
                                  break;
                          }
                          if (copyin(diag_action, &diag_register,
                              sizeof(diag_register)) != 0)
                                  return (MPS_DIAG_FAILURE);
                          status = mps_diag_register(sc, &diag_register,
                              return_code);
                          break;
  
                  case MPS_FW_DIAG_TYPE_UNREGISTER:
                          if (length < sizeof(diag_unregister)) {
                                  *return_code =
                                      MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                                  status = MPS_DIAG_FAILURE;
                                  break;
                          }
                          if (copyin(diag_action, &diag_unregister,
                              sizeof(diag_unregister)) != 0)
                                  return (MPS_DIAG_FAILURE);
                          status = mps_diag_unregister(sc, &diag_unregister,
                              return_code);
                          break;
  
                  case MPS_FW_DIAG_TYPE_QUERY:
                          if (length < sizeof (diag_query)) {
                                  *return_code =
                                      MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                                  status = MPS_DIAG_FAILURE;
                                  break;
                          }
                          if (copyin(diag_action, &diag_query, sizeof(diag_query))
                              != 0)
                                  return (MPS_DIAG_FAILURE);
                          status = mps_diag_query(sc, &diag_query, return_code);
                          if (status == MPS_DIAG_SUCCESS)
                                  if (copyout(&diag_query, diag_action,
                                      sizeof (diag_query)) != 0)
                                          return (MPS_DIAG_FAILURE);
                          break;
  
                  case MPS_FW_DIAG_TYPE_READ_BUFFER:
                          if (copyin(diag_action, &diag_read_buffer,
                              sizeof(diag_read_buffer)) != 0)
                                  return (MPS_DIAG_FAILURE);
                          if (length < diag_read_buffer.BytesToRead) {
                                  *return_code =
                                      MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                                  status = MPS_DIAG_FAILURE;
                                  break;
                          }
                          status = mps_diag_read_buffer(sc, &diag_read_buffer,
                              PTRIN(diag_read_buffer.PtrDataBuffer),
                              return_code);
                          if (status == MPS_DIAG_SUCCESS) {
                                  if (copyout(&diag_read_buffer, diag_action,
                                      sizeof(diag_read_buffer) -
                                      sizeof(diag_read_buffer.PtrDataBuffer)) !=
                                      0)
                                          return (MPS_DIAG_FAILURE);
                          }
                          break;
  
                  case MPS_FW_DIAG_TYPE_RELEASE:
                          if (length < sizeof(diag_release)) {
                                  *return_code =
                                      MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                                  status = MPS_DIAG_FAILURE;
                                  break;
                          }
                          if (copyin(diag_action, &diag_release,
                              sizeof(diag_release)) != 0)
                                  return (MPS_DIAG_FAILURE);
                          status = mps_diag_release(sc, &diag_release,
                              return_code);
                          break;
  
                  default:
                          *return_code = MPS_FW_DIAG_ERROR_INVALID_PARAMETER;
                          status = MPS_DIAG_FAILURE;
                          break;
          }
  
          if ((status == MPS_DIAG_FAILURE) &&
              (original_return_code == MPS_FW_DIAG_NEW) &&
              (*return_code != MPS_FW_DIAG_ERROR_SUCCESS))
                  status = MPS_DIAG_SUCCESS;
  
          return (status);
  }
  
  static int
  mps_user_diag_action(struct mps_softc *sc, mps_diag_action_t *data)
  {
          int                     status;
  
          /*
           * Only allow one diag action at one time.
           */
          if (sc->mps_flags & MPS_FLAGS_BUSY) {
                  mps_dprint(sc, MPS_INFO, "%s: Only one FW diag command "
                      "allowed at a single time.", __func__);
                  return (EBUSY);
          }
          sc->mps_flags |= MPS_FLAGS_BUSY;
  
          /*
           * Send diag action request
           */
          if (data->Action == MPS_FW_DIAG_TYPE_REGISTER ||
              data->Action == MPS_FW_DIAG_TYPE_UNREGISTER ||
              data->Action == MPS_FW_DIAG_TYPE_QUERY ||
              data->Action == MPS_FW_DIAG_TYPE_READ_BUFFER ||
              data->Action == MPS_FW_DIAG_TYPE_RELEASE) {
                  status = mps_do_diag_action(sc, data->Action,
                      PTRIN(data->PtrDiagAction), data->Length,
                      &data->ReturnCode);
          } else
                  status = EINVAL;
  
          sc->mps_flags &= ~MPS_FLAGS_BUSY;
          return (status);
  }
  
  /*
   * Copy the event recording mask and the event queue size out.  For
   * clarification, the event recording mask (events_to_record) is not the same
   * thing as the event mask (event_mask).  events_to_record has a bit set for
   * every event type that is to be recorded by the driver, and event_mask has a
   * bit cleared for every event that is allowed into the driver from the IOC.
   * They really have nothing to do with each other.
   */
  static void
  mps_user_event_query(struct mps_softc *sc, mps_event_query_t *data)
  {
          uint8_t i;
  
          mps_lock(sc);
          data->Entries = MPS_EVENT_QUEUE_SIZE;
  
          for (i = 0; i < 4; i++) {
                  data->Types[i] = sc->events_to_record[i];
          }
          mps_unlock(sc);
  }
  
  /*
   * Set the driver's event mask according to what's been given.  See
   * mps_user_event_query for explanation of the event recording mask and the IOC
   * event mask.  It's the app's responsibility to enable event logging by setting
   * the bits in events_to_record.  Initially, no events will be logged.
   */
  static void
  mps_user_event_enable(struct mps_softc *sc, mps_event_enable_t *data)
  {
          uint8_t i;
  
          mps_lock(sc);
          for (i = 0; i < 4; i++) {
                  sc->events_to_record[i] = data->Types[i];
          }
          mps_unlock(sc);
  }
  
  /*
   * Copy out the events that have been recorded, up to the max events allowed.
   */
  static int
  mps_user_event_report(struct mps_softc *sc, mps_event_report_t *data)
  {
          int             status = 0;
          uint32_t        size;
  
          mps_lock(sc);
          size = data->Size;
          if ((size >= sizeof(sc->recorded_events)) && (status == 0)) {
                  mps_unlock(sc);
                  if (copyout((void *)sc->recorded_events,
                      PTRIN(data->PtrEvents), size) != 0)
                          status = EFAULT;
                  mps_lock(sc);
          } else {
                  /*
                   * data->Size value is not large enough to copy event data.
                   */
                  status = EFAULT;
          }
  
          /*
           * Change size value to match the number of bytes that were copied.
           */
          if (status == 0)
                  data->Size = sizeof(sc->recorded_events);
          mps_unlock(sc);
  
          return (status);
  }
  
  /*
   * Record events into the driver from the IOC if they are not masked.
   */
  void
  mpssas_record_event(struct mps_softc *sc,
      MPI2_EVENT_NOTIFICATION_REPLY *event_reply)
  {
          uint32_t        event;
          int             i, j;
          uint16_t        event_data_len;
          boolean_t       sendAEN = FALSE;
  
          event = event_reply->Event;
  
          /*
           * Generate a system event to let anyone who cares know that a
           * LOG_ENTRY_ADDED event has occurred.  This is sent no matter what the
           * event mask is set to.
           */
          if (event == MPI2_EVENT_LOG_ENTRY_ADDED) {
                  sendAEN = TRUE;
          }
  
          /*
           * Record the event only if its corresponding bit is set in
           * events_to_record.  event_index is the index into recorded_events and
           * event_number is the overall number of an event being recorded since
           * start-of-day.  event_index will roll over; event_number will never
           * roll over.
           */
          i = (uint8_t)(event / 32);
          j = (uint8_t)(event % 32);
          if ((i < 4) && ((1 << j) & sc->events_to_record[i])) {
                  i = sc->event_index;
                  sc->recorded_events[i].Type = event;
                  sc->recorded_events[i].Number = ++sc->event_number;
                  bzero(sc->recorded_events[i].Data, MPS_MAX_EVENT_DATA_LENGTH *
                      4);
                  event_data_len = event_reply->EventDataLength;
  
                  if (event_data_len > 0) {
                          /*
                           * Limit data to size in m_event entry
                           */
                          if (event_data_len > MPS_MAX_EVENT_DATA_LENGTH) {
                                  event_data_len = MPS_MAX_EVENT_DATA_LENGTH;
                          }
                          for (j = 0; j < event_data_len; j++) {
                                  sc->recorded_events[i].Data[j] =
                                      event_reply->EventData[j];
                          }
  
                          /*
                           * check for index wrap-around
                           */
                          if (++i == MPS_EVENT_QUEUE_SIZE) {
                                  i = 0;
                          }
                          sc->event_index = (uint8_t)i;
  
                          /*
                           * Set flag to send the event.
                           */
                          sendAEN = TRUE;
                  }
          }
  
          /*
           * Generate a system event if flag is set to let anyone who cares know
           * that an event has occurred.
           */
          if (sendAEN) {
  //SLM-how to send a system event (see kqueue, kevent)
  //              (void) ddi_log_sysevent(mpt->m_dip, DDI_VENDOR_LSI, "MPT_SAS",
  //                  "SAS", NULL, NULL, DDI_NOSLEEP);
          }
  }
  
  static int
  mps_user_reg_access(struct mps_softc *sc, mps_reg_access_t *data)
  {
          int     status = 0;
  
          switch (data->Command) {
                  /*
                   * IO access is not supported.
                   */
                  case REG_IO_READ:
                  case REG_IO_WRITE:
                          mps_dprint(sc, MPS_INFO, "IO access is not supported. "
                              "Use memory access.");
                          status = EINVAL;
                          break;
  
                  case REG_MEM_READ:
                          data->RegData = mps_regread(sc, data->RegOffset);
                          break;
  
                  case REG_MEM_WRITE:
                          mps_regwrite(sc, data->RegOffset, data->RegData);
                          break;
  
                  default:
                          status = EINVAL;
                          break;
          }
  
          return (status);
  }
  
  static int
  mps_user_btdh(struct mps_softc *sc, mps_btdh_mapping_t *data)
  {
          uint8_t         bt2dh = FALSE;
          uint8_t         dh2bt = FALSE;
          uint16_t        dev_handle, bus, target;
  
          bus = data->Bus;
          target = data->TargetID;
          dev_handle = data->DevHandle;
  
          /*
           * When DevHandle is 0xFFFF and Bus/Target are not 0xFFFF, use Bus/
           * Target to get DevHandle.  When Bus/Target are 0xFFFF and DevHandle is
           * not 0xFFFF, use DevHandle to get Bus/Target.  Anything else is
           * invalid.
           */
          if ((bus == 0xFFFF) && (target == 0xFFFF) && (dev_handle != 0xFFFF))
                  dh2bt = TRUE;
          if ((dev_handle == 0xFFFF) && (bus != 0xFFFF) && (target != 0xFFFF))
                  bt2dh = TRUE;
          if (!dh2bt && !bt2dh)
                  return (EINVAL);
  
          /*
           * Only handle bus of 0.  Make sure target is within range.
           */
          if (bt2dh) {
                  if (bus != 0)
                          return (EINVAL);
  
                  if (target > sc->max_devices) {
                          mps_dprint(sc, MPS_FAULT, "Target ID is out of range "
                             "for Bus/Target to DevHandle mapping.");
                          return (EINVAL);
                  }
                  dev_handle = sc->mapping_table[target].dev_handle;
                  if (dev_handle)
                          data->DevHandle = dev_handle;
          } else {
                  bus = 0;
                  target = mps_mapping_get_sas_id_from_handle(sc, dev_handle);
                  data->Bus = bus;
                  data->TargetID = target;
          }
  
          return (0);
  }
  
  static int
  mps_ioctl(struct cdev *dev, u_long cmd, void *arg, int flag)
  {
          struct mps_softc *sc;
          struct mps_cfg_page_req *page_req;
          struct mps_ext_cfg_page_req *ext_page_req;
          void *mps_page;
          int error, reset_loop;
  
          mps_page = NULL;
          sc = dev->si_drv1;
          page_req = arg;
          ext_page_req = arg;
  
          switch (cmd) {
          case MPSIO_READ_CFG_HEADER:
                  mps_lock(sc);
                  error = mps_user_read_cfg_header(sc, page_req);
                  mps_unlock(sc);
                  break;
          case MPSIO_READ_CFG_PAGE:
                  mps_page = kmalloc(page_req->len, M_MPSUSER, M_WAITOK | M_ZERO);
                  error = copyin(page_req->buf, mps_page,
                      sizeof(MPI2_CONFIG_PAGE_HEADER));
                  if (error)
                          break;
                  mps_lock(sc);
                  error = mps_user_read_cfg_page(sc, page_req, mps_page);
                  mps_unlock(sc);
                  if (error)
                          break;
                  error = copyout(mps_page, page_req->buf, page_req->len);
                  break;
          case MPSIO_READ_EXT_CFG_HEADER:
                  mps_lock(sc);
                  error = mps_user_read_extcfg_header(sc, ext_page_req);
                  mps_unlock(sc);
                  break;
          case MPSIO_READ_EXT_CFG_PAGE:
                  mps_page = kmalloc(ext_page_req->len, M_MPSUSER, M_WAITOK|M_ZERO);
                  error = copyin(ext_page_req->buf, mps_page,
                      sizeof(MPI2_CONFIG_EXTENDED_PAGE_HEADER));
                  if (error)
                          break;
                  mps_lock(sc);
                  error = mps_user_read_extcfg_page(sc, ext_page_req, mps_page);
                  mps_unlock(sc);
                  if (error)
                          break;
                  error = copyout(mps_page, ext_page_req->buf, ext_page_req->len);
                  break;
          case MPSIO_WRITE_CFG_PAGE:
                  mps_page = kmalloc(page_req->len, M_MPSUSER, M_WAITOK|M_ZERO);
                  error = copyin(page_req->buf, mps_page, page_req->len);
                  if (error)
                          break;
                  mps_lock(sc);
                  error = mps_user_write_cfg_page(sc, page_req, mps_page);
                  mps_unlock(sc);
                  break;
          case MPSIO_MPS_COMMAND:
                  error = mps_user_command(sc, (struct mps_usr_command *)arg);
                  break;
          case MPTIOCTL_PASS_THRU:
                  /*
                   * The user has requested to pass through a command to be
                   * executed by the MPT firmware.  Call our routine which does
                   * this.  Only allow one passthru IOCTL at one time.
                   */
                  error = mps_user_pass_thru(sc, (mps_pass_thru_t *)arg);
                  break;
          case MPTIOCTL_GET_ADAPTER_DATA:
                  /*
                   * The user has requested to read adapter data.  Call our
                   * routine which does this.
                   */
                  error = 0;
                  mps_user_get_adapter_data(sc, (mps_adapter_data_t *)arg);
                  break;
          case MPTIOCTL_GET_PCI_INFO:
                  /*
                   * The user has requested to read pci info.  Call
                   * our routine which does this.
                   */
                  mps_lock(sc);
                  error = 0;
                  mps_user_read_pci_info(sc, (mps_pci_info_t *)arg);
                  mps_unlock(sc);
                  break;
          case MPTIOCTL_RESET_ADAPTER:
                  mps_lock(sc);
                  sc->port_enable_complete = 0;
                  error = mps_reinit(sc);
                  mps_unlock(sc);
                  /*
                   * Wait no more than 5 minutes for Port Enable to complete
                   */
                  for (reset_loop = 0; (reset_loop < MPS_DIAG_RESET_TIMEOUT) &&
                      (!sc->port_enable_complete); reset_loop++) {
                          DELAY(1000);
                  }
                  if (reset_loop == MPS_DIAG_RESET_TIMEOUT) {
                          kprintf("Port Enable did not complete after Diag "
                              "Reset.\n");
                  }
                  break;
          case MPTIOCTL_DIAG_ACTION:
                  /*
                   * The user has done a diag buffer action.  Call our routine
                   * which does this.  Only allow one diag action at one time.
                   */
                  mps_lock(sc);
                  error = mps_user_diag_action(sc, (mps_diag_action_t *)arg);
                  mps_unlock(sc);
                  break;
          case MPTIOCTL_EVENT_QUERY:
                  /*
                   * The user has done an event query. Call our routine which does
                   * this.
                   */
                  error = 0;
                  mps_user_event_query(sc, (mps_event_query_t *)arg);
                  break;
          case MPTIOCTL_EVENT_ENABLE:
                  /*
                   * The user has done an event enable. Call our routine which
                   * does this.
                   */
                  error = 0;
                  mps_user_event_enable(sc, (mps_event_enable_t *)arg);
                  break;
          case MPTIOCTL_EVENT_REPORT:
                  /*
                   * The user has done an event report. Call our routine which
                   * does this.
                   */
                  error = mps_user_event_report(sc, (mps_event_report_t *)arg);
                  break;
          case MPTIOCTL_REG_ACCESS:
                  /*
                   * The user has requested register access.  Call our routine
                   * which does this.
                   */
                  mps_lock(sc);
                  error = mps_user_reg_access(sc, (mps_reg_access_t *)arg);
                  mps_unlock(sc);
                  break;
          case MPTIOCTL_BTDH_MAPPING:
                  /*
                   * The user has requested to translate a bus/target to a
                   * DevHandle or a DevHandle to a bus/target.  Call our routine
                   * which does this.
                   */
                  error = mps_user_btdh(sc, (mps_btdh_mapping_t *)arg);
                  break;
          default:
                  error = ENOIOCTL;
                  break;
          }
  
          if (mps_page != NULL)
                  kfree(mps_page, M_MPSUSER);
  
          return (error);
  }
  
  #ifdef COMPAT_FREEBSD32
  
  struct mps_cfg_page_req32 {
          MPI2_CONFIG_PAGE_HEADER header;
          uint32_t page_address;
          uint32_t buf;
          int     len;
          uint16_t ioc_status;
  };
  
  struct mps_ext_cfg_page_req32 {
          MPI2_CONFIG_EXTENDED_PAGE_HEADER header;
          uint32_t page_address;
          uint32_t buf;
          int     len;
          uint16_t ioc_status;
  };
  
  struct mps_raid_action32 {
          uint8_t action;
          uint8_t volume_bus;
          uint8_t volume_id;
          uint8_t phys_disk_num;
          uint32_t action_data_word;
          uint32_t buf;
          int len;
          uint32_t volume_status;
          uint32_t action_data[4];
          uint16_t action_status;
          uint16_t ioc_status;
          uint8_t write;
  };
  
  struct mps_usr_command32 {
          uint32_t req;
          uint32_t req_len;
          uint32_t rpl;
          uint32_t rpl_len;
          uint32_t buf;
          int len;
          uint32_t flags;
  };
  
  #define MPSIO_READ_CFG_HEADER32 _IOWR('M', 200, struct mps_cfg_page_req32)
  #define MPSIO_READ_CFG_PAGE32   _IOWR('M', 201, struct mps_cfg_page_req32)
  #define MPSIO_READ_EXT_CFG_HEADER32 _IOWR('M', 202, struct mps_ext_cfg_page_req32)
  #define MPSIO_READ_EXT_CFG_PAGE32 _IOWR('M', 203, struct mps_ext_cfg_page_req32)
  #define MPSIO_WRITE_CFG_PAGE32  _IOWR('M', 204, struct mps_cfg_page_req32)
  #define MPSIO_RAID_ACTION32     _IOWR('M', 205, struct mps_raid_action32)
  #define MPSIO_MPS_COMMAND32     _IOWR('M', 210, struct mps_usr_command32)
  
  static int
  mps_ioctl32(struct cdev *dev, u_long cmd32, void *_arg, int flag,
      struct thread *td)
  {
          struct mps_cfg_page_req32 *page32 = _arg;
          struct mps_ext_cfg_page_req32 *ext32 = _arg;
          struct mps_raid_action32 *raid32 = _arg;
          struct mps_usr_command32 *user32 = _arg;
          union {
                  struct mps_cfg_page_req page;
                  struct mps_ext_cfg_page_req ext;
                  struct mps_raid_action raid;
                  struct mps_usr_command user;
          } arg;
          u_long cmd;
          int error;
  
          switch (cmd32) {
          case MPSIO_READ_CFG_HEADER32:
          case MPSIO_READ_CFG_PAGE32:
          case MPSIO_WRITE_CFG_PAGE32:
                  if (cmd32 == MPSIO_READ_CFG_HEADER32)
                          cmd = MPSIO_READ_CFG_HEADER;
                  else if (cmd32 == MPSIO_READ_CFG_PAGE32)
                          cmd = MPSIO_READ_CFG_PAGE;
                  else
                          cmd = MPSIO_WRITE_CFG_PAGE;
                  CP(*page32, arg.page, header);
                  CP(*page32, arg.page, page_address);
                  PTRIN_CP(*page32, arg.page, buf);
                  CP(*page32, arg.page, len);
                  CP(*page32, arg.page, ioc_status);
                  break;
  
          case MPSIO_READ_EXT_CFG_HEADER32:
          case MPSIO_READ_EXT_CFG_PAGE32:
                  if (cmd32 == MPSIO_READ_EXT_CFG_HEADER32)
                          cmd = MPSIO_READ_EXT_CFG_HEADER;
                  else
                          cmd = MPSIO_READ_EXT_CFG_PAGE;
                  CP(*ext32, arg.ext, header);
                  CP(*ext32, arg.ext, page_address);
                  PTRIN_CP(*ext32, arg.ext, buf);
                  CP(*ext32, arg.ext, len);
                  CP(*ext32, arg.ext, ioc_status);
                  break;
  
          case MPSIO_RAID_ACTION32:
                  cmd = MPSIO_RAID_ACTION;
                  CP(*raid32, arg.raid, action);
                  CP(*raid32, arg.raid, volume_bus);
                  CP(*raid32, arg.raid, volume_id);
                  CP(*raid32, arg.raid, phys_disk_num);
                  CP(*raid32, arg.raid, action_data_word);
                  PTRIN_CP(*raid32, arg.raid, buf);
                  CP(*raid32, arg.raid, len);
                  CP(*raid32, arg.raid, volume_status);
                  bcopy(raid32->action_data, arg.raid.action_data,
                      sizeof arg.raid.action_data);
                  CP(*raid32, arg.raid, ioc_status);
                  CP(*raid32, arg.raid, write);
                  break;
  
          case MPSIO_MPS_COMMAND32:
                  cmd = MPSIO_MPS_COMMAND;
                  PTRIN_CP(*user32, arg.user, req);
                  CP(*user32, arg.user, req_len);
                  PTRIN_CP(*user32, arg.user, rpl);
                  CP(*user32, arg.user, rpl_len);
                  PTRIN_CP(*user32, arg.user, buf);
                  CP(*user32, arg.user, len);
                  CP(*user32, arg.user, flags);
                  break;
          default:
                  return (ENOIOCTL);
          }
  
          error = mps_ioctl(dev, cmd, &arg, flag, td);
          if (error == 0 && (cmd32 & IOC_OUT) != 0) {
                  switch (cmd32) {
                  case MPSIO_READ_CFG_HEADER32:
                  case MPSIO_READ_CFG_PAGE32:
                  case MPSIO_WRITE_CFG_PAGE32:
                          CP(arg.page, *page32, header);
                          CP(arg.page, *page32, page_address);
                          PTROUT_CP(arg.page, *page32, buf);
                          CP(arg.page, *page32, len);
                          CP(arg.page, *page32, ioc_status);
                          break;
  
                  case MPSIO_READ_EXT_CFG_HEADER32:
                  case MPSIO_READ_EXT_CFG_PAGE32:
                          CP(arg.ext, *ext32, header);
                          CP(arg.ext, *ext32, page_address);
                          PTROUT_CP(arg.ext, *ext32, buf);
                          CP(arg.ext, *ext32, len);
                          CP(arg.ext, *ext32, ioc_status);
                          break;
  
                  case MPSIO_RAID_ACTION32:
                          CP(arg.raid, *raid32, action);
                          CP(arg.raid, *raid32, volume_bus);
                          CP(arg.raid, *raid32, volume_id);
                          CP(arg.raid, *raid32, phys_disk_num);
                          CP(arg.raid, *raid32, action_data_word);
                          PTROUT_CP(arg.raid, *raid32, buf);
                          CP(arg.raid, *raid32, len);
                          CP(arg.raid, *raid32, volume_status);
                          bcopy(arg.raid.action_data, raid32->action_data,
                              sizeof arg.raid.action_data);
                          CP(arg.raid, *raid32, ioc_status);
                          CP(arg.raid, *raid32, write);
                          break;
  
                  case MPSIO_MPS_COMMAND32:
                          PTROUT_CP(arg.user, *user32, req);
                          CP(arg.user, *user32, req_len);
                          PTROUT_CP(arg.user, *user32, rpl);
                          CP(arg.user, *user32, rpl_len);
                          PTROUT_CP(arg.user, *user32, buf);
                          CP(arg.user, *user32, len);
                          CP(arg.user, *user32, flags);
                          break;
                  }
          }
  
          return (error);
  }
  #endif /* COMPAT_FREEBSD32 */
  
  static int
  mps_ioctl_devsw(struct dev_ioctl_args *ap)
  {
          cdev_t dev = ap->a_head.a_dev;
          u_long com = ap->a_cmd;
          caddr_t arg = ap->a_data;
          int flag = ap->a_fflag;
  
  #ifdef COMPAT_FREEBSD32
          if (SV_CURPROC_FLAG(SV_ILP32))
                  return (mps_ioctl32(dev, com, arg, flag, td));
  #endif
          return (mps_ioctl(dev, com, arg, flag));
  }

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