The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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: stable/11/sys/dev/mfi/mfi_cam.c 331722 2018-03-29 02:50:57Z eadler $");
   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 SYSCTL_INT(_hw_mfi, OID_AUTO, allow_cam_disk_passthrough, CTLFLAG_RDTUN,
   94     &mfi_allow_disks, 0, "event message locale");
   95 
   96 static devclass_t       mfip_devclass;
   97 static device_method_t  mfip_methods[] = {
   98         DEVMETHOD(device_probe,         mfip_probe),
   99         DEVMETHOD(device_attach,        mfip_attach),
  100         DEVMETHOD(device_detach,        mfip_detach),
  101 
  102         DEVMETHOD_END
  103 };
  104 static driver_t mfip_driver = {
  105         "mfip",
  106         mfip_methods,
  107         sizeof(struct mfip_softc)
  108 };
  109 DRIVER_MODULE(mfip, mfi, mfip_driver, mfip_devclass, 0, 0);
  110 MODULE_DEPEND(mfip, cam, 1, 1, 1);
  111 MODULE_DEPEND(mfip, mfi, 1, 1, 1);
  112 
  113 #define ccb_mfip_ptr sim_priv.entries[0].ptr
  114 
  115 static int
  116 mfip_probe(device_t dev)
  117 {
  118 
  119         device_set_desc(dev, "SCSI Passthrough Bus");
  120         return (0);
  121 }
  122 
  123 static int
  124 mfip_attach(device_t dev)
  125 {
  126         struct mfip_softc *sc;
  127         struct mfi_softc *mfisc;
  128 
  129         sc = device_get_softc(dev);
  130         if (sc == NULL)
  131                 return (EINVAL);
  132 
  133         mfisc = device_get_softc(device_get_parent(dev));
  134         sc->dev = dev;
  135         sc->state = MFIP_STATE_NONE;
  136         sc->mfi_sc = mfisc;
  137         mfisc->mfi_cam_start = mfip_start;
  138 
  139         if ((sc->devq = cam_simq_alloc(MFI_SCSI_MAX_CMDS)) == NULL)
  140                 return (ENOMEM);
  141 
  142         sc->sim = cam_sim_alloc(mfip_cam_action, mfip_cam_poll, "mfi", sc,
  143                                 device_get_unit(dev), &mfisc->mfi_io_lock, 1,
  144                                 MFI_SCSI_MAX_CMDS, sc->devq);
  145         if (sc->sim == NULL) {
  146                 cam_simq_free(sc->devq);
  147                 sc->devq = NULL;
  148                 device_printf(dev, "CAM SIM attach failed\n");
  149                 return (EINVAL);
  150         }
  151 
  152         mfisc->mfi_cam_rescan_cb = mfip_cam_rescan;
  153 
  154         mtx_lock(&mfisc->mfi_io_lock);
  155         if (xpt_bus_register(sc->sim, dev, 0) != 0) {
  156                 device_printf(dev, "XPT bus registration failed\n");
  157                 cam_sim_free(sc->sim, FALSE);
  158                 sc->sim = NULL;
  159                 cam_simq_free(sc->devq);
  160                 sc->devq = NULL;
  161                 mtx_unlock(&mfisc->mfi_io_lock);
  162                 return (EINVAL);
  163         }
  164         mtx_unlock(&mfisc->mfi_io_lock);
  165 
  166         return (0);
  167 }
  168 
  169 static int
  170 mfip_detach(device_t dev)
  171 {
  172         struct mfip_softc *sc;
  173 
  174         sc = device_get_softc(dev);
  175         if (sc == NULL)
  176                 return (EINVAL);
  177 
  178         mtx_lock(&sc->mfi_sc->mfi_io_lock);
  179         if (sc->state == MFIP_STATE_RESCAN) {
  180                 mtx_unlock(&sc->mfi_sc->mfi_io_lock);
  181                 return (EBUSY);
  182         }
  183         sc->state = MFIP_STATE_DETACH;
  184         mtx_unlock(&sc->mfi_sc->mfi_io_lock);
  185 
  186         sc->mfi_sc->mfi_cam_rescan_cb = NULL;
  187 
  188         if (sc->sim != NULL) {
  189                 mtx_lock(&sc->mfi_sc->mfi_io_lock);
  190                 xpt_bus_deregister(cam_sim_path(sc->sim));
  191                 cam_sim_free(sc->sim, FALSE);
  192                 sc->sim = NULL;
  193                 mtx_unlock(&sc->mfi_sc->mfi_io_lock);
  194         }
  195 
  196         if (sc->devq != NULL) {
  197                 cam_simq_free(sc->devq);
  198                 sc->devq = NULL;
  199         }
  200 
  201         return (0);
  202 }
  203 
  204 static void
  205 mfip_cam_action(struct cam_sim *sim, union ccb *ccb)
  206 {
  207         struct mfip_softc *sc = cam_sim_softc(sim);
  208         struct mfi_softc *mfisc = sc->mfi_sc;
  209 
  210         mtx_assert(&mfisc->mfi_io_lock, MA_OWNED);
  211 
  212         switch (ccb->ccb_h.func_code) {
  213         case XPT_PATH_INQ:
  214         {
  215                 struct ccb_pathinq *cpi = &ccb->cpi;
  216 
  217                 cpi->version_num = 1;
  218                 cpi->hba_inquiry = PI_TAG_ABLE;
  219                 cpi->target_sprt = 0;
  220                 cpi->hba_misc = PIM_NOBUSRESET | PIM_SEQSCAN | PIM_UNMAPPED;
  221                 cpi->hba_eng_cnt = 0;
  222                 cpi->max_target = MFI_SCSI_MAX_TARGETS;
  223                 cpi->max_lun = MFI_SCSI_MAX_LUNS;
  224                 cpi->initiator_id = MFI_SCSI_INITIATOR_ID;
  225                 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
  226                 strlcpy(cpi->hba_vid, "LSI", HBA_IDLEN);
  227                 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
  228                 cpi->unit_number = cam_sim_unit(sim);
  229                 cpi->bus_id = cam_sim_bus(sim);
  230                 cpi->base_transfer_speed = 150000;
  231                 cpi->transport = XPORT_SAS;
  232                 cpi->transport_version = 0;
  233                 cpi->protocol = PROTO_SCSI;
  234                 cpi->protocol_version = SCSI_REV_2;
  235                 cpi->ccb_h.status = CAM_REQ_CMP;
  236                 break;
  237         }
  238         case XPT_RESET_BUS:
  239                 ccb->ccb_h.status = CAM_REQ_CMP;
  240                 break;
  241         case XPT_RESET_DEV:
  242                 ccb->ccb_h.status = CAM_REQ_CMP;
  243                 break;
  244         case XPT_GET_TRAN_SETTINGS:
  245         {
  246                 struct ccb_trans_settings_scsi *scsi =
  247                     &ccb->cts.proto_specific.scsi;
  248                 struct ccb_trans_settings_sas *sas =
  249                     &ccb->cts.xport_specific.sas;
  250 
  251                 ccb->cts.protocol = PROTO_SCSI;
  252                 ccb->cts.protocol_version = SCSI_REV_2;
  253                 ccb->cts.transport = XPORT_SAS;
  254                 ccb->cts.transport_version = 0;
  255 
  256                 scsi->valid = CTS_SCSI_VALID_TQ;
  257                 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
  258 
  259                 sas->valid &= ~CTS_SAS_VALID_SPEED;
  260                 sas->bitrate = 150000;
  261 
  262                 ccb->ccb_h.status = CAM_REQ_CMP;
  263                 break;
  264         }
  265         case XPT_SET_TRAN_SETTINGS:
  266                 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
  267                 break;
  268         case XPT_SCSI_IO:
  269         {
  270                 struct ccb_hdr          *ccbh = &ccb->ccb_h;
  271                 struct ccb_scsiio       *csio = &ccb->csio;
  272 
  273                 ccbh->status = CAM_REQ_INPROG;
  274                 if (csio->cdb_len > MFI_SCSI_MAX_CDB_LEN) {
  275                         ccbh->status = CAM_REQ_INVALID;
  276                         break;
  277                 }
  278                 ccbh->ccb_mfip_ptr = sc;
  279                 TAILQ_INSERT_TAIL(&mfisc->mfi_cam_ccbq, ccbh, sim_links.tqe);
  280                 mfi_startio(mfisc);
  281                 return;
  282         }
  283         default:
  284                 ccb->ccb_h.status = CAM_REQ_INVALID;
  285                 break;
  286         }
  287 
  288         xpt_done(ccb);
  289         return;
  290 }
  291 
  292 static void
  293 mfip_cam_rescan(struct mfi_softc *sc, uint32_t tid)
  294 {
  295         union ccb *ccb;
  296         struct mfip_softc *camsc;
  297         struct cam_sim *sim;
  298         device_t mfip_dev;
  299 
  300         mtx_lock(&Giant);
  301         mfip_dev = device_find_child(sc->mfi_dev, "mfip", -1);
  302         mtx_unlock(&Giant);
  303         if (mfip_dev == NULL) {
  304                 device_printf(sc->mfi_dev, "Couldn't find mfip child device!\n");
  305                 return;
  306         }
  307 
  308         mtx_lock(&sc->mfi_io_lock);
  309         camsc = device_get_softc(mfip_dev);
  310         if (camsc->state == MFIP_STATE_DETACH) {
  311                 mtx_unlock(&sc->mfi_io_lock);
  312                 return;
  313         }
  314         camsc->state = MFIP_STATE_RESCAN;
  315 
  316         ccb = xpt_alloc_ccb_nowait();
  317         if (ccb == NULL) {
  318                 mtx_unlock(&sc->mfi_io_lock);
  319                 device_printf(sc->mfi_dev,
  320                     "Cannot allocate ccb for bus rescan.\n");
  321                 return;
  322         }
  323 
  324         sim = camsc->sim;
  325         if (xpt_create_path(&ccb->ccb_h.path, NULL, cam_sim_path(sim),
  326             tid, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
  327                 xpt_free_ccb(ccb);
  328                 mtx_unlock(&sc->mfi_io_lock);
  329                 device_printf(sc->mfi_dev,
  330                     "Cannot create path for bus rescan.\n");
  331                 return;
  332         }
  333         xpt_rescan(ccb);
  334 
  335         camsc->state = MFIP_STATE_NONE;
  336         mtx_unlock(&sc->mfi_io_lock);
  337 }
  338 
  339 static struct mfi_command *
  340 mfip_start(void *data)
  341 {
  342         union ccb *ccb = data;
  343         struct ccb_hdr *ccbh = &ccb->ccb_h;
  344         struct ccb_scsiio *csio = &ccb->csio;
  345         struct mfip_softc *sc;
  346         struct mfi_pass_frame *pt;
  347         struct mfi_command *cm;
  348         uint32_t context = 0;
  349 
  350         sc = ccbh->ccb_mfip_ptr;
  351 
  352         if ((cm = mfi_dequeue_free(sc->mfi_sc)) == NULL)
  353                 return (NULL);
  354 
  355         /* Zero out the MFI frame */
  356         context = cm->cm_frame->header.context;
  357         bzero(cm->cm_frame, sizeof(union mfi_frame));
  358         cm->cm_frame->header.context = context;
  359 
  360         pt = &cm->cm_frame->pass;
  361         pt->header.cmd = MFI_CMD_PD_SCSI_IO;
  362         pt->header.cmd_status = 0;
  363         pt->header.scsi_status = 0;
  364         pt->header.target_id = ccbh->target_id;
  365         pt->header.lun_id = ccbh->target_lun;
  366         pt->header.flags = 0;
  367         pt->header.timeout = 0;
  368         pt->header.data_len = csio->dxfer_len;
  369         pt->header.sense_len = MFI_SENSE_LEN;
  370         pt->header.cdb_len = csio->cdb_len;
  371         pt->sense_addr_lo = (uint32_t)cm->cm_sense_busaddr;
  372         pt->sense_addr_hi = (uint32_t)((uint64_t)cm->cm_sense_busaddr >> 32);
  373         if (ccbh->flags & CAM_CDB_POINTER)
  374                 bcopy(csio->cdb_io.cdb_ptr, &pt->cdb[0], csio->cdb_len);
  375         else
  376                 bcopy(csio->cdb_io.cdb_bytes, &pt->cdb[0], csio->cdb_len);
  377         cm->cm_complete = mfip_done;
  378         cm->cm_private = ccb;
  379         cm->cm_sg = &pt->sgl;
  380         cm->cm_total_frame_size = MFI_PASS_FRAME_SIZE;
  381         cm->cm_data = ccb;
  382         cm->cm_len = csio->dxfer_len;
  383         switch (ccbh->flags & CAM_DIR_MASK) {
  384         case CAM_DIR_IN:
  385                 cm->cm_flags = MFI_CMD_DATAIN | MFI_CMD_CCB;
  386                 break;
  387         case CAM_DIR_OUT:
  388                 cm->cm_flags = MFI_CMD_DATAOUT | MFI_CMD_CCB;
  389                 break;
  390         case CAM_DIR_NONE:
  391         default:
  392                 cm->cm_data = NULL;
  393                 cm->cm_len = 0;
  394                 cm->cm_flags = 0;
  395                 break;
  396         }
  397 
  398         TAILQ_REMOVE(&sc->mfi_sc->mfi_cam_ccbq, ccbh, sim_links.tqe);
  399         return (cm);
  400 }
  401 
  402 static void
  403 mfip_done(struct mfi_command *cm)
  404 {
  405         union ccb *ccb = cm->cm_private;
  406         struct ccb_hdr *ccbh = &ccb->ccb_h;
  407         struct ccb_scsiio *csio = &ccb->csio;
  408         struct mfip_softc *sc;
  409         struct mfi_pass_frame *pt;
  410 
  411         sc = ccbh->ccb_mfip_ptr;
  412         pt = &cm->cm_frame->pass;
  413 
  414         switch (pt->header.cmd_status) {
  415         case MFI_STAT_OK:
  416         {
  417                 uint8_t command, device;
  418 
  419                 ccbh->status = CAM_REQ_CMP;
  420                 csio->scsi_status = pt->header.scsi_status;
  421                 if (ccbh->flags & CAM_CDB_POINTER)
  422                         command = csio->cdb_io.cdb_ptr[0];
  423                 else
  424                         command = csio->cdb_io.cdb_bytes[0];
  425                 if (command == INQUIRY) {
  426                         device = csio->data_ptr[0] & 0x1f;
  427                         if ((!mfi_allow_disks && device == T_DIRECT) ||
  428                             (device == T_PROCESSOR))
  429                                 csio->data_ptr[0] =
  430                                      (csio->data_ptr[0] & 0xe0) | T_NODEVICE;
  431                 }
  432                 break;
  433         }
  434         case MFI_STAT_SCSI_DONE_WITH_ERROR:
  435         {
  436                 int sense_len;
  437 
  438                 ccbh->status = CAM_SCSI_STATUS_ERROR | CAM_AUTOSNS_VALID;
  439                 csio->scsi_status = pt->header.scsi_status;
  440                 if (pt->header.sense_len < csio->sense_len)
  441                         csio->sense_resid = csio->sense_len -
  442                             pt->header.sense_len;
  443                 else
  444                         csio->sense_resid = 0;
  445                 sense_len = min(pt->header.sense_len,
  446                     sizeof(struct scsi_sense_data));
  447                 bzero(&csio->sense_data, sizeof(struct scsi_sense_data));
  448                 bcopy(&cm->cm_sense->data[0], &csio->sense_data, sense_len);
  449                 break;
  450         }
  451         case MFI_STAT_DEVICE_NOT_FOUND:
  452                 ccbh->status = CAM_SEL_TIMEOUT;
  453                 break;
  454         case MFI_STAT_SCSI_IO_FAILED:
  455                 ccbh->status = CAM_REQ_CMP_ERR;
  456                 csio->scsi_status = pt->header.scsi_status;
  457                 break;
  458         default:
  459                 ccbh->status = CAM_REQ_CMP_ERR;
  460                 csio->scsi_status = pt->header.scsi_status;
  461                 break;
  462         }
  463 
  464         mfi_release_command(cm);
  465         xpt_done(ccb);
  466 }
  467 
  468 static void
  469 mfip_cam_poll(struct cam_sim *sim)
  470 {
  471         struct mfip_softc *sc = cam_sim_softc(sim);
  472         struct mfi_softc *mfisc = sc->mfi_sc;
  473 
  474         mfisc->mfi_intr_ptr(mfisc);
  475 }
  476 

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