The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/mfi/mfi_cam.c

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    1 /*-
    2  * Copyright 2007 Scott Long
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.0/sys/dev/mfi/mfi_cam.c 254742 2013-08-23 22:55:52Z markj $");
   29 
   30 #include "opt_mfi.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/malloc.h>
   36 #include <sys/module.h>
   37 #include <sys/selinfo.h>
   38 #include <sys/bus.h>
   39 #include <sys/conf.h>
   40 #include <sys/eventhandler.h>
   41 #include <sys/rman.h>
   42 #include <sys/bus_dma.h>
   43 #include <sys/bio.h>
   44 #include <sys/ioccom.h>
   45 #include <sys/uio.h>
   46 #include <sys/proc.h>
   47 #include <sys/signalvar.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <cam/cam.h>
   51 #include <cam/cam_ccb.h>
   52 #include <cam/cam_debug.h>
   53 #include <cam/cam_periph.h>
   54 #include <cam/cam_sim.h>
   55 #include <cam/cam_xpt_periph.h>
   56 #include <cam/cam_xpt_sim.h>
   57 #include <cam/scsi/scsi_all.h>
   58 #include <cam/scsi/scsi_message.h>
   59 
   60 #include <machine/md_var.h>
   61 #include <machine/bus.h>
   62 #include <machine/resource.h>
   63 
   64 #include <dev/mfi/mfireg.h>
   65 #include <dev/mfi/mfi_ioctl.h>
   66 #include <dev/mfi/mfivar.h>
   67 
   68 enum mfip_state {
   69         MFIP_STATE_NONE,
   70         MFIP_STATE_DETACH,
   71         MFIP_STATE_RESCAN
   72 };
   73 
   74 struct mfip_softc {
   75         device_t        dev;
   76         struct mfi_softc *mfi_sc;
   77         struct cam_devq *devq;
   78         struct cam_sim  *sim;
   79         struct cam_path *path;
   80         enum mfip_state state;
   81 };
   82 
   83 static int      mfip_probe(device_t);
   84 static int      mfip_attach(device_t);
   85 static int      mfip_detach(device_t);
   86 static void     mfip_cam_action(struct cam_sim *, union ccb *);
   87 static void     mfip_cam_poll(struct cam_sim *);
   88 static void     mfip_cam_rescan(struct mfi_softc *, uint32_t tid);
   89 static struct mfi_command * mfip_start(void *);
   90 static void     mfip_done(struct mfi_command *cm);
   91 
   92 static int mfi_allow_disks = 0;
   93 TUNABLE_INT("hw.mfi.allow_cam_disk_passthrough", &mfi_allow_disks);
   94 SYSCTL_INT(_hw_mfi, OID_AUTO, allow_cam_disk_passthrough, CTLFLAG_RD,
   95     &mfi_allow_disks, 0, "event message locale");
   96 
   97 static devclass_t       mfip_devclass;
   98 static device_method_t  mfip_methods[] = {
   99         DEVMETHOD(device_probe,         mfip_probe),
  100         DEVMETHOD(device_attach,        mfip_attach),
  101         DEVMETHOD(device_detach,        mfip_detach),
  102 
  103         DEVMETHOD_END
  104 };
  105 static driver_t mfip_driver = {
  106         "mfip",
  107         mfip_methods,
  108         sizeof(struct mfip_softc)
  109 };
  110 DRIVER_MODULE(mfip, mfi, mfip_driver, mfip_devclass, 0, 0);
  111 MODULE_DEPEND(mfip, cam, 1, 1, 1);
  112 MODULE_DEPEND(mfip, mfi, 1, 1, 1);
  113 
  114 #define ccb_mfip_ptr sim_priv.entries[0].ptr
  115 
  116 static int
  117 mfip_probe(device_t dev)
  118 {
  119 
  120         device_set_desc(dev, "SCSI Passthrough Bus");
  121         return (0);
  122 }
  123 
  124 static int
  125 mfip_attach(device_t dev)
  126 {
  127         struct mfip_softc *sc;
  128         struct mfi_softc *mfisc;
  129 
  130         sc = device_get_softc(dev);
  131         if (sc == NULL)
  132                 return (EINVAL);
  133 
  134         mfisc = device_get_softc(device_get_parent(dev));
  135         sc->dev = dev;
  136         sc->state = MFIP_STATE_NONE;
  137         sc->mfi_sc = mfisc;
  138         mfisc->mfi_cam_start = mfip_start;
  139 
  140         if ((sc->devq = cam_simq_alloc(MFI_SCSI_MAX_CMDS)) == NULL)
  141                 return (ENOMEM);
  142 
  143         sc->sim = cam_sim_alloc(mfip_cam_action, mfip_cam_poll, "mfi", sc,
  144                                 device_get_unit(dev), &mfisc->mfi_io_lock, 1,
  145                                 MFI_SCSI_MAX_CMDS, sc->devq);
  146         if (sc->sim == NULL) {
  147                 cam_simq_free(sc->devq);
  148                 sc->devq = NULL;
  149                 device_printf(dev, "CAM SIM attach failed\n");
  150                 return (EINVAL);
  151         }
  152 
  153         mfisc->mfi_cam_rescan_cb = mfip_cam_rescan;
  154 
  155         mtx_lock(&mfisc->mfi_io_lock);
  156         if (xpt_bus_register(sc->sim, dev, 0) != 0) {
  157                 device_printf(dev, "XPT bus registration failed\n");
  158                 cam_sim_free(sc->sim, FALSE);
  159                 sc->sim = NULL;
  160                 cam_simq_free(sc->devq);
  161                 sc->devq = NULL;
  162                 mtx_unlock(&mfisc->mfi_io_lock);
  163                 return (EINVAL);
  164         }
  165         mtx_unlock(&mfisc->mfi_io_lock);
  166 
  167         return (0);
  168 }
  169 
  170 static int
  171 mfip_detach(device_t dev)
  172 {
  173         struct mfip_softc *sc;
  174 
  175         sc = device_get_softc(dev);
  176         if (sc == NULL)
  177                 return (EINVAL);
  178 
  179         mtx_lock(&sc->mfi_sc->mfi_io_lock);
  180         if (sc->state == MFIP_STATE_RESCAN) {
  181                 mtx_unlock(&sc->mfi_sc->mfi_io_lock);
  182                 return (EBUSY);
  183         }
  184         sc->state = MFIP_STATE_DETACH;
  185         mtx_unlock(&sc->mfi_sc->mfi_io_lock);
  186 
  187         sc->mfi_sc->mfi_cam_rescan_cb = NULL;
  188 
  189         if (sc->sim != NULL) {
  190                 mtx_lock(&sc->mfi_sc->mfi_io_lock);
  191                 xpt_bus_deregister(cam_sim_path(sc->sim));
  192                 cam_sim_free(sc->sim, FALSE);
  193                 sc->sim = NULL;
  194                 mtx_unlock(&sc->mfi_sc->mfi_io_lock);
  195         }
  196 
  197         if (sc->devq != NULL) {
  198                 cam_simq_free(sc->devq);
  199                 sc->devq = NULL;
  200         }
  201 
  202         return (0);
  203 }
  204 
  205 static void
  206 mfip_cam_action(struct cam_sim *sim, union ccb *ccb)
  207 {
  208         struct mfip_softc *sc = cam_sim_softc(sim);
  209         struct mfi_softc *mfisc = sc->mfi_sc;
  210 
  211         mtx_assert(&mfisc->mfi_io_lock, MA_OWNED);
  212 
  213         switch (ccb->ccb_h.func_code) {
  214         case XPT_PATH_INQ:
  215         {
  216                 struct ccb_pathinq *cpi = &ccb->cpi;
  217 
  218                 cpi->version_num = 1;
  219                 cpi->hba_inquiry = PI_SDTR_ABLE|PI_TAG_ABLE|PI_WIDE_16;
  220                 cpi->target_sprt = 0;
  221                 cpi->hba_misc = PIM_NOBUSRESET|PIM_SEQSCAN;
  222                 cpi->hba_eng_cnt = 0;
  223                 cpi->max_target = MFI_SCSI_MAX_TARGETS;
  224                 cpi->max_lun = MFI_SCSI_MAX_LUNS;
  225                 cpi->initiator_id = MFI_SCSI_INITIATOR_ID;
  226                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
  227                 strncpy(cpi->hba_vid, "LSI", HBA_IDLEN);
  228                 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
  229                 cpi->unit_number = cam_sim_unit(sim);
  230                 cpi->bus_id = cam_sim_bus(sim);
  231                 cpi->base_transfer_speed = 150000;
  232                 cpi->transport = XPORT_SAS;
  233                 cpi->transport_version = 0;
  234                 cpi->protocol = PROTO_SCSI;
  235                 cpi->protocol_version = SCSI_REV_2;
  236                 cpi->ccb_h.status = CAM_REQ_CMP;
  237                 break;
  238         }
  239         case XPT_RESET_BUS:
  240                 ccb->ccb_h.status = CAM_REQ_CMP;
  241                 break;
  242         case XPT_RESET_DEV:
  243                 ccb->ccb_h.status = CAM_REQ_CMP;
  244                 break;
  245         case XPT_GET_TRAN_SETTINGS:
  246         {
  247                 struct ccb_trans_settings_sas *sas =
  248                     &ccb->cts.xport_specific.sas;
  249 
  250                 ccb->cts.protocol = PROTO_SCSI;
  251                 ccb->cts.protocol_version = SCSI_REV_2;
  252                 ccb->cts.transport = XPORT_SAS;
  253                 ccb->cts.transport_version = 0;
  254 
  255                 sas->valid &= ~CTS_SAS_VALID_SPEED;
  256                 sas->bitrate = 150000;
  257 
  258                 ccb->ccb_h.status = CAM_REQ_CMP;
  259                 break;
  260         }
  261         case XPT_SET_TRAN_SETTINGS:
  262                 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
  263                 break;
  264         case XPT_SCSI_IO:
  265         {
  266                 struct ccb_hdr          *ccbh = &ccb->ccb_h;
  267                 struct ccb_scsiio       *csio = &ccb->csio;
  268 
  269                 ccbh->status = CAM_REQ_INPROG;
  270                 if (csio->cdb_len > MFI_SCSI_MAX_CDB_LEN) {
  271                         ccbh->status = CAM_REQ_INVALID;
  272                         break;
  273                 }
  274                 ccbh->ccb_mfip_ptr = sc;
  275                 TAILQ_INSERT_TAIL(&mfisc->mfi_cam_ccbq, ccbh, sim_links.tqe);
  276                 mfi_startio(mfisc);
  277                 return;
  278         }
  279         default:
  280                 ccb->ccb_h.status = CAM_REQ_INVALID;
  281                 break;
  282         }
  283 
  284         xpt_done(ccb);
  285         return;
  286 }
  287 
  288 static void
  289 mfip_cam_rescan(struct mfi_softc *sc, uint32_t tid)
  290 {
  291         union ccb *ccb;
  292         struct mfip_softc *camsc;
  293         struct cam_sim *sim;
  294         device_t mfip_dev;
  295 
  296         mtx_lock(&Giant);
  297         mfip_dev = device_find_child(sc->mfi_dev, "mfip", -1);
  298         mtx_unlock(&Giant);
  299         if (mfip_dev == NULL) {
  300                 device_printf(sc->mfi_dev, "Couldn't find mfip child device!\n");
  301                 return;
  302         }
  303 
  304         mtx_lock(&sc->mfi_io_lock);
  305         camsc = device_get_softc(mfip_dev);
  306         if (camsc->state == MFIP_STATE_DETACH) {
  307                 mtx_unlock(&sc->mfi_io_lock);
  308                 return;
  309         }
  310         camsc->state = MFIP_STATE_RESCAN;
  311 
  312         ccb = xpt_alloc_ccb_nowait();
  313         if (ccb == NULL) {
  314                 mtx_unlock(&sc->mfi_io_lock);
  315                 device_printf(sc->mfi_dev,
  316                     "Cannot allocate ccb for bus rescan.\n");
  317                 return;
  318         }
  319 
  320         sim = camsc->sim;
  321         if (xpt_create_path(&ccb->ccb_h.path, NULL, cam_sim_path(sim),
  322             tid, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
  323                 xpt_free_ccb(ccb);
  324                 mtx_unlock(&sc->mfi_io_lock);
  325                 device_printf(sc->mfi_dev,
  326                     "Cannot create path for bus rescan.\n");
  327                 return;
  328         }
  329         xpt_rescan(ccb);
  330 
  331         camsc->state = MFIP_STATE_NONE;
  332         mtx_unlock(&sc->mfi_io_lock);
  333 }
  334 
  335 static struct mfi_command *
  336 mfip_start(void *data)
  337 {
  338         union ccb *ccb = data;
  339         struct ccb_hdr *ccbh = &ccb->ccb_h;
  340         struct ccb_scsiio *csio = &ccb->csio;
  341         struct mfip_softc *sc;
  342         struct mfi_pass_frame *pt;
  343         struct mfi_command *cm;
  344         uint32_t context = 0;
  345 
  346         sc = ccbh->ccb_mfip_ptr;
  347 
  348         if ((cm = mfi_dequeue_free(sc->mfi_sc)) == NULL)
  349                 return (NULL);
  350 
  351         /* Zero out the MFI frame */
  352         context = cm->cm_frame->header.context;
  353         bzero(cm->cm_frame, sizeof(union mfi_frame));
  354         cm->cm_frame->header.context = context;
  355 
  356         pt = &cm->cm_frame->pass;
  357         pt->header.cmd = MFI_CMD_PD_SCSI_IO;
  358         pt->header.cmd_status = 0;
  359         pt->header.scsi_status = 0;
  360         pt->header.target_id = ccbh->target_id;
  361         pt->header.lun_id = ccbh->target_lun;
  362         pt->header.flags = 0;
  363         pt->header.timeout = 0;
  364         pt->header.data_len = csio->dxfer_len;
  365         pt->header.sense_len = MFI_SENSE_LEN;
  366         pt->header.cdb_len = csio->cdb_len;
  367         pt->sense_addr_lo = (uint32_t)cm->cm_sense_busaddr;
  368         pt->sense_addr_hi = (uint32_t)((uint64_t)cm->cm_sense_busaddr >> 32);
  369         if (ccbh->flags & CAM_CDB_POINTER)
  370                 bcopy(csio->cdb_io.cdb_ptr, &pt->cdb[0], csio->cdb_len);
  371         else
  372                 bcopy(csio->cdb_io.cdb_bytes, &pt->cdb[0], csio->cdb_len);
  373         cm->cm_complete = mfip_done;
  374         cm->cm_private = ccb;
  375         cm->cm_sg = &pt->sgl;
  376         cm->cm_total_frame_size = MFI_PASS_FRAME_SIZE;
  377         cm->cm_data = ccb;
  378         cm->cm_len = csio->dxfer_len;
  379         switch (ccbh->flags & CAM_DIR_MASK) {
  380         case CAM_DIR_IN:
  381                 cm->cm_flags = MFI_CMD_DATAIN | MFI_CMD_CCB;
  382                 break;
  383         case CAM_DIR_OUT:
  384                 cm->cm_flags = MFI_CMD_DATAOUT | MFI_CMD_CCB;
  385                 break;
  386         case CAM_DIR_NONE:
  387         default:
  388                 cm->cm_data = NULL;
  389                 cm->cm_len = 0;
  390                 cm->cm_flags = 0;
  391                 break;
  392         }
  393 
  394         TAILQ_REMOVE(&sc->mfi_sc->mfi_cam_ccbq, ccbh, sim_links.tqe);
  395         return (cm);
  396 }
  397 
  398 static void
  399 mfip_done(struct mfi_command *cm)
  400 {
  401         union ccb *ccb = cm->cm_private;
  402         struct ccb_hdr *ccbh = &ccb->ccb_h;
  403         struct ccb_scsiio *csio = &ccb->csio;
  404         struct mfip_softc *sc;
  405         struct mfi_pass_frame *pt;
  406 
  407         sc = ccbh->ccb_mfip_ptr;
  408         pt = &cm->cm_frame->pass;
  409 
  410         switch (pt->header.cmd_status) {
  411         case MFI_STAT_OK:
  412         {
  413                 uint8_t command, device;
  414 
  415                 ccbh->status = CAM_REQ_CMP;
  416                 csio->scsi_status = pt->header.scsi_status;
  417                 if (ccbh->flags & CAM_CDB_POINTER)
  418                         command = csio->cdb_io.cdb_ptr[0];
  419                 else
  420                         command = csio->cdb_io.cdb_bytes[0];
  421                 if (command == INQUIRY) {
  422                         device = csio->data_ptr[0] & 0x1f;
  423                         if ((!mfi_allow_disks && device == T_DIRECT) ||
  424                             (device == T_PROCESSOR))
  425                                 csio->data_ptr[0] =
  426                                      (csio->data_ptr[0] & 0xe0) | T_NODEVICE;
  427                 }
  428                 break;
  429         }
  430         case MFI_STAT_SCSI_DONE_WITH_ERROR:
  431         {
  432                 int sense_len;
  433 
  434                 ccbh->status = CAM_SCSI_STATUS_ERROR | CAM_AUTOSNS_VALID;
  435                 csio->scsi_status = pt->header.scsi_status;
  436                 if (pt->header.sense_len < csio->sense_len)
  437                         csio->sense_resid = csio->sense_len -
  438                             pt->header.sense_len;
  439                 else
  440                         csio->sense_resid = 0;
  441                 sense_len = min(pt->header.sense_len,
  442                     sizeof(struct scsi_sense_data));
  443                 bzero(&csio->sense_data, sizeof(struct scsi_sense_data));
  444                 bcopy(&cm->cm_sense->data[0], &csio->sense_data, sense_len);
  445                 break;
  446         }
  447         case MFI_STAT_DEVICE_NOT_FOUND:
  448                 ccbh->status = CAM_SEL_TIMEOUT;
  449                 break;
  450         case MFI_STAT_SCSI_IO_FAILED:
  451                 ccbh->status = CAM_REQ_CMP_ERR;
  452                 csio->scsi_status = pt->header.scsi_status;
  453                 break;
  454         default:
  455                 ccbh->status = CAM_REQ_CMP_ERR;
  456                 csio->scsi_status = pt->header.scsi_status;
  457                 break;
  458         }
  459 
  460         mfi_release_command(cm);
  461         xpt_done(ccb);
  462 }
  463 
  464 static void
  465 mfip_cam_poll(struct cam_sim *sim)
  466 {
  467         struct mfip_softc *sc = cam_sim_softc(sim);
  468         struct mfi_softc *mfisc = sc->mfi_sc;
  469 
  470         mfisc->mfi_intr_ptr(mfisc);
  471 }
  472 

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