/*- * Copyright (c) 2001-2003 Thomas Quinot * 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, * without modification, immediately at the beginning of the file. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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. */ #include __FBSDID("$FreeBSD: head/sys/dev/ata/atapi-cam.c 120315 2003-09-21 08:53:05Z thomas $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* hardware command descriptor block */ struct atapi_hcb { struct atapi_xpt_softc *softc; int unit; int bus; int target; int lun; union ccb *ccb; int flags; #define QUEUED 0x0001 char *dxfer_alloc; TAILQ_ENTRY(atapi_hcb) chain; }; /* private data associated with an ATA bus */ struct atapi_xpt_softc { struct ata_channel *ata_ch; struct cam_path *path; struct cam_sim *sim; int flags; #define BUS_REGISTERED 0x01 #define RESOURCE_SHORTAGE 0x02 TAILQ_HEAD(,atapi_hcb) pending_hcbs; LIST_ENTRY(atapi_xpt_softc) chain; }; enum reinit_reason { BOOT_ATTACH, ATTACH, RESET }; static struct mtx atapicam_softc_mtx; static LIST_HEAD(,atapi_xpt_softc) all_buses = LIST_HEAD_INITIALIZER(all_buses); /* CAM XPT methods */ static void atapi_action(struct cam_sim *, union ccb *); static void atapi_poll(struct cam_sim *); static void atapi_async(void *, u_int32_t, struct cam_path *, void *); static void atapi_async1(void *, u_int32_t, struct cam_path *, void *); static void atapi_cb(struct ata_request *); /* internal functions */ static void reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason); static void setup_dev(struct atapi_xpt_softc *, struct ata_device *); static void setup_async_cb(struct atapi_xpt_softc *, uint32_t); static void cam_rescan_callback(struct cam_periph *, union ccb *); static void cam_rescan(struct cam_sim *); static void free_hcb_and_ccb_done(struct atapi_hcb *, u_int32_t); static struct atapi_hcb *allocate_hcb(struct atapi_xpt_softc *, int, int, union ccb *); static void free_hcb(struct atapi_hcb *hcb); static void free_softc(struct atapi_xpt_softc *scp); static struct atapi_xpt_softc *get_softc(struct ata_channel *ata_ch); static struct ata_device *get_ata_device(struct atapi_xpt_softc *scp, int id); static MALLOC_DEFINE(M_ATACAM, "ATA CAM transport", "ATA driver CAM-XPT layer"); void atapi_cam_attach_bus(struct ata_channel *ata_ch) { struct atapi_xpt_softc *scp = NULL; struct cam_devq *devq = NULL; struct cam_sim *sim = NULL; struct cam_path *path = NULL; int unit; GIANT_REQUIRED; if (mtx_initialized(&atapicam_softc_mtx) == 0) mtx_init(&atapicam_softc_mtx, "ATAPI/CAM softc mutex", NULL, MTX_DEF); mtx_lock(&atapicam_softc_mtx); LIST_FOREACH(scp, &all_buses, chain) { if (scp->ata_ch == ata_ch) break; } mtx_unlock(&atapicam_softc_mtx); if (scp != NULL) return; if ((scp = malloc(sizeof(struct atapi_xpt_softc), M_ATACAM, M_NOWAIT | M_ZERO)) == NULL) goto error; scp->ata_ch = ata_ch; TAILQ_INIT(&scp->pending_hcbs); LIST_INSERT_HEAD(&all_buses, scp, chain); unit = device_get_unit(ata_ch->dev); if ((devq = cam_simq_alloc(16)) == NULL) goto error; if ((sim = cam_sim_alloc(atapi_action, atapi_poll, "ata", (void *)scp, unit, 1, 1, devq)) == NULL) { cam_simq_free(devq); goto error; } scp->sim = sim; if (xpt_bus_register(sim, 0) != CAM_SUCCESS) { goto error; } scp->flags |= BUS_REGISTERED; if (xpt_create_path(&path, /*periph*/ NULL, cam_sim_path(sim), CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) { goto error; } scp->path = path; CAM_DEBUG(path, CAM_DEBUG_TRACE, ("Registered SIM for ata%d\n", unit)); setup_async_cb(scp, AC_LOST_DEVICE); reinit_bus(scp, cold ? BOOT_ATTACH : ATTACH); return; error: free_softc(scp); } void atapi_cam_detach_bus(struct ata_channel *ata_ch) { struct atapi_xpt_softc *scp = get_softc(ata_ch); mtx_lock(&Giant); free_softc(scp); mtx_unlock(&Giant); } void atapi_cam_reinit_bus(struct ata_channel *ata_ch) { struct atapi_xpt_softc *scp = get_softc(ata_ch); /* * scp might be null if the bus is being reinitialised during * the boot-up sequence, before the ATAPI bus is registered. */ if (scp != NULL) { mtx_lock(&Giant); reinit_bus(scp, RESET); mtx_unlock(&Giant); } } static void reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason) { GIANT_REQUIRED; if (scp->ata_ch->devices & ATA_ATAPI_MASTER) setup_dev(scp, &scp->ata_ch->device[MASTER]); if (scp->ata_ch->devices & ATA_ATAPI_SLAVE) setup_dev(scp, &scp->ata_ch->device[SLAVE]); switch (reason) { case BOOT_ATTACH: break; case RESET: xpt_async(AC_BUS_RESET, scp->path, NULL); /*FALLTHROUGH*/ case ATTACH: cam_rescan(scp->sim); break; } } static void setup_dev(struct atapi_xpt_softc *scp, struct ata_device *atp) { if (atp->softc == NULL) { ata_set_name(atp, "atapicam", 2 * device_get_unit(atp->channel->dev) + (atp->unit == ATA_MASTER) ? 0 : 1); atp->softc = (void *)scp; } } static void setup_async_cb(struct atapi_xpt_softc *scp, uint32_t events) { struct ccb_setasync csa; GIANT_REQUIRED; xpt_setup_ccb(&csa.ccb_h, scp->path, /*priority*/ 5); csa.ccb_h.func_code = XPT_SASYNC_CB; csa.event_enable = events; csa.callback = &atapi_async; csa.callback_arg = scp->sim; xpt_action((union ccb *) &csa); } static void atapi_action(struct cam_sim *sim, union ccb *ccb) { struct atapi_xpt_softc *softc = (struct atapi_xpt_softc*)cam_sim_softc(sim); struct ccb_hdr *ccb_h = &ccb->ccb_h; struct atapi_hcb *hcb = NULL; struct ata_request *request = NULL; int unit = cam_sim_unit(sim); int bus = cam_sim_bus(sim); int len; char *buf; switch (ccb_h->func_code) { case XPT_PATH_INQ: { struct ccb_pathinq *cpi = &ccb->cpi; cpi->version_num = 1; cpi->hba_inquiry = 0; cpi->target_sprt = 0; cpi->hba_misc = PIM_NO_6_BYTE; cpi->hba_eng_cnt = 0; bzero(cpi->vuhba_flags, sizeof(cpi->vuhba_flags)); cpi->max_target = 1; cpi->max_lun = 0; cpi->async_flags = 0; cpi->hpath_id = 0; cpi->initiator_id = 7; strncpy(cpi->sim_vid, "FreeBSD", sizeof(cpi->sim_vid)); strncpy(cpi->hba_vid, "ATAPI", sizeof(cpi->hba_vid)); strncpy(cpi->dev_name, cam_sim_name(sim), sizeof cpi->dev_name); cpi->unit_number = cam_sim_unit(sim); cpi->bus_id = cam_sim_bus(sim); cpi->base_transfer_speed = 3300; if (softc->ata_ch && ccb_h->target_id != CAM_TARGET_WILDCARD) { switch (softc->ata_ch->device[ccb_h->target_id].mode) { case ATA_PIO1: cpi->base_transfer_speed = 5200; break; case ATA_PIO2: cpi->base_transfer_speed = 7000; break; case ATA_PIO3: cpi->base_transfer_speed = 11000; break; case ATA_PIO4: case ATA_DMA: case ATA_WDMA2: cpi->base_transfer_speed = 16000; break; case ATA_UDMA2: cpi->base_transfer_speed = 33000; break; case ATA_UDMA4: cpi->base_transfer_speed = 66000; break; case ATA_UDMA5: cpi->base_transfer_speed = 100000; break; case ATA_UDMA6: cpi->base_transfer_speed = 133000; break; default: break; } } ccb->ccb_h.status = CAM_REQ_CMP; xpt_done(ccb); return; } case XPT_RESET_DEV: { int tid = ccb_h->target_id; struct ata_device *dev = get_ata_device(softc, tid); CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("dev reset\n")); ata_controlcmd(dev, ATA_ATAPI_RESET, 0, 0, 0); ccb->ccb_h.status = CAM_REQ_CMP; xpt_done(ccb); return; } case XPT_RESET_BUS: CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("bus reset\n")); ata_reinit(softc->ata_ch); ccb->ccb_h.status = CAM_REQ_CMP; xpt_done(ccb); return; case XPT_SET_TRAN_SETTINGS: /* ignore these, we're not doing SCSI here */ CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("SET_TRAN_SETTINGS not supported\n")); ccb->ccb_h.status = CAM_FUNC_NOTAVAIL; xpt_done(ccb); return; case XPT_GET_TRAN_SETTINGS: { struct ccb_trans_settings *cts = &ccb->cts; /* * XXX The default CAM transport code is very SCSI-specific and * doesn't understand IDE speeds very well. Be silent about it * here and let it default to what is set in XPT_PATH_INQ */ CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("GET_TRAN_SETTINGS\n")); cts->valid = (CCB_TRANS_DISC_VALID | CCB_TRANS_TQ_VALID); cts->flags &= ~(CCB_TRANS_DISC_ENB | CCB_TRANS_TAG_ENB); ccb->ccb_h.status = CAM_REQ_CMP; xpt_done(ccb); return; } case XPT_CALC_GEOMETRY: { CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("CALC_GEOMETRY\n")); cam_calc_geometry(&ccb->ccg, /*extended*/1); xpt_done(ccb); return; } case XPT_SCSI_IO: { struct ccb_scsiio *csio = &ccb->csio; int tid = ccb_h->target_id, lid = ccb_h->target_lun; struct ata_device *dev = get_ata_device(softc, tid); int request_flags = ATA_R_QUIET | ATA_R_ATAPI; CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("XPT_SCSI_IO\n")); /* check that this request was not aborted already */ if ((ccb_h->status & CAM_STATUS_MASK) != CAM_REQ_INPROG) { printf("XPT_SCSI_IO received but already in progress?\n"); xpt_done(ccb); return; } if (dev == NULL) { CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("SCSI IO received for invalid device\n")); goto action_invalid; } if (lid > 0) { CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("SCSI IO received for invalid lun %d\n", lid)); goto action_invalid; } if (csio->cdb_len > sizeof request->u.atapi.ccb) { CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("CAM CCB too long for ATAPI")); goto action_invalid; } if ((ccb_h->flags & CAM_SCATTER_VALID)) { /* scatter-gather not supported */ xpt_print_path(ccb_h->path); printf("ATAPI/CAM does not support scatter-gather yet!\n"); goto action_invalid; } switch (ccb_h->flags & CAM_DIR_MASK) { case CAM_DIR_IN: request_flags |= ATA_R_READ; break; case CAM_DIR_OUT: request_flags |= ATA_R_WRITE; break; case CAM_DIR_NONE: request_flags |= ATA_R_CONTROL; break; default: ata_prtdev(dev, "unknown IO operation\n"); goto action_invalid; } if ((hcb = allocate_hcb(softc, unit, bus, ccb)) == NULL) { printf("cannot allocate ATAPI/CAM hcb\n"); goto action_oom; } if ((request = ata_alloc_request()) == NULL) { printf("cannot allocate ATAPI/CAM request\n"); goto action_oom; } bcopy((ccb_h->flags & CAM_CDB_POINTER) ? csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes, request->u.atapi.ccb, csio->cdb_len); #ifdef CAMDEBUG if (CAM_DEBUGGED(ccb_h->path, CAM_DEBUG_CDB)) { char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1]; printf("atapi_action: hcb@%p: %s\n", hcb, scsi_cdb_string(request->u.atapi.ccb, cdb_str, sizeof(cdb_str))); } #endif len = csio->dxfer_len; buf = csio->data_ptr; /* some SCSI commands require special processing */ switch (request->u.atapi.ccb[0]) { case INQUIRY: { /* * many ATAPI devices seem to report more than * SHORT_INQUIRY_LENGTH bytes of available INQUIRY * information, but respond with some incorrect condition * when actually asked for it, so we are going to pretend * that only SHORT_INQUIRY_LENGTH are expected, anyway. */ struct scsi_inquiry *inq = (struct scsi_inquiry *) &request->u.atapi.ccb[0]; if (inq->byte2 == 0 && inq->page_code == 0 && inq->length > SHORT_INQUIRY_LENGTH) { bzero(buf, len); len = inq->length = SHORT_INQUIRY_LENGTH; } break; } case READ_6: /* FALLTHROUGH */ case WRITE_6: CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("Translating %s into _10 equivalent\n", (request->u.atapi.ccb[0] == READ_6) ? "READ_6" : "WRITE_6")); request->u.atapi.ccb[0] |= 0x20; request->u.atapi.ccb[9] = request->u.atapi.ccb[5]; request->u.atapi.ccb[8] = request->u.atapi.ccb[4]; request->u.atapi.ccb[7] = 0; request->u.atapi.ccb[6] = 0; request->u.atapi.ccb[5] = request->u.atapi.ccb[3]; request->u.atapi.ccb[4] = request->u.atapi.ccb[2]; request->u.atapi.ccb[3] = request->u.atapi.ccb[1] & 0x1f; request->u.atapi.ccb[2] = 0; request->u.atapi.ccb[1] = 0; break; } if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN && (len & 1)) { /* ATA always transfers an even number of bytes */ if ((buf = hcb->dxfer_alloc = malloc(++len, M_ATACAM, M_NOWAIT | M_ZERO)) == NULL) { printf("cannot allocate ATAPI/CAM buffer\n"); goto action_oom; } } request->device = dev; request->driver = hcb; request->data = buf; request->bytecount = len; request->transfersize = min(request->bytecount, 65534); request->timeout = ccb_h->timeout; request->retries = 2; request->callback = &atapi_cb; request->flags = request_flags; TAILQ_INSERT_TAIL(&softc->pending_hcbs, hcb, chain); hcb->flags |= QUEUED; ccb_h->status |= CAM_SIM_QUEUED; ata_queue_request(request); return; } default: CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("unsupported function code 0x%02x\n", ccb_h->func_code)); goto action_invalid; } /* NOTREACHED */ action_oom: if (request != NULL) ata_free_request(request); if (hcb != NULL) free_hcb(hcb); xpt_print_path(ccb_h->path); printf("out of memory, freezing queue.\n"); softc->flags |= RESOURCE_SHORTAGE; xpt_freeze_simq(sim, /*count*/ 1); ccb_h->status = CAM_REQUEUE_REQ; xpt_done(ccb); return; action_invalid: ccb_h->status = CAM_REQ_INVALID; xpt_done(ccb); return; } static void atapi_poll(struct cam_sim *sim) { /* do nothing - we do not actually service any interrupts */ printf("atapi_poll called!\n"); } static void atapi_cb(struct ata_request *request) { struct atapi_hcb *hcb = (struct atapi_hcb *) request->driver; struct ccb_scsiio *csio = &hcb->ccb->csio; int hcb_status = request->result; mtx_lock(&Giant); #ifdef CAMDEBUG if (CAM_DEBUGGED(csio->ccb_h.path, CAM_DEBUG_CDB)) { printf("atapi_cb: hcb@%p status = %02x: (sk = %02x%s%s%s)\n", hcb, hcb_status, hcb_status >> 4, (hcb_status & 4) ? " ABRT" : "", (hcb_status & 2) ? " EOM" : "", (hcb_status & 1) ? " ILI" : ""); printf(" %s: cmd %02x\n", request->device->name, request->u.atapi.ccb[0]); } #endif if (hcb_status != 0) { csio->scsi_status = SCSI_STATUS_CHECK_COND; #if 0 /* * XXX Temporarily disable autosense, as this seems to cause * a missed ATA interrupt. */ if ((csio->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0) { int8_t ccb[16] = { ATAPI_REQUEST_SENSE, 0, 0, 0, sizeof(struct atapi_sense), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; if (ata_atapicmd(request->device, ccb, (caddr_t)&csio->sense_data, sizeof(struct atapi_sense), ATA_R_READ, 30) == 0) { csio->ccb_h.status |= CAM_AUTOSNS_VALID; } } #endif free_hcb_and_ccb_done(hcb, CAM_SCSI_STATUS_ERROR); } else { if (((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) && hcb->dxfer_alloc != NULL) { bcopy(hcb->dxfer_alloc, csio->data_ptr, csio->dxfer_len); } csio->scsi_status = SCSI_STATUS_OK; free_hcb_and_ccb_done(hcb, CAM_REQ_CMP); } mtx_unlock(&Giant); } static void free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status) { struct atapi_xpt_softc *softc = hcb->softc; union ccb *ccb = hcb->ccb; GIANT_REQUIRED; if (hcb != NULL) { /* we're about to free a hcb, so the shortage has ended */ if (softc->flags & RESOURCE_SHORTAGE) { softc->flags &= ~RESOURCE_SHORTAGE; status |= CAM_RELEASE_SIMQ; } free_hcb(hcb); } ccb->ccb_h.status = status | (ccb->ccb_h.status & ~(CAM_STATUS_MASK | CAM_SIM_QUEUED)); xpt_done(ccb); } static void atapi_async(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg) { mtx_lock(&Giant); atapi_async1(callback_arg, code, path, arg); mtx_unlock(&Giant); } static void atapi_async1(void *callback_arg, u_int32_t code, struct cam_path* path, void *arg) { struct atapi_xpt_softc *softc; struct cam_sim *sim; int targ; GIANT_REQUIRED; sim = (struct cam_sim *) callback_arg; softc = (struct atapi_xpt_softc *) cam_sim_softc(sim); switch (code) { case AC_LOST_DEVICE: targ = xpt_path_target_id(path); xpt_print_path(path); if (targ == -1) printf("Lost host adapter\n"); else printf("Lost target %d???\n", targ); break; default: break; } } static void cam_rescan_callback(struct cam_periph *periph, union ccb *ccb) { if (ccb->ccb_h.status != CAM_REQ_CMP) { CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("Rescan failed, 0x%04x\n", ccb->ccb_h.status)); } else { CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("Rescan succeeded\n")); } xpt_free_path(ccb->ccb_h.path); free(ccb, M_ATACAM); } static void cam_rescan(struct cam_sim *sim) { struct cam_path *path; union ccb *ccb = malloc(sizeof(union ccb), M_ATACAM, M_WAITOK | M_ZERO); if (xpt_create_path(&path, xpt_periph, cam_sim_path(sim), CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) return; CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("Rescanning ATAPI bus.\n")); xpt_setup_ccb(&ccb->ccb_h, path, 5/*priority (low)*/); ccb->ccb_h.func_code = XPT_SCAN_BUS; ccb->ccb_h.cbfcnp = cam_rescan_callback; ccb->crcn.flags = CAM_FLAG_NONE; xpt_action(ccb); /* scan is in progress now */ } static struct atapi_hcb * allocate_hcb(struct atapi_xpt_softc *softc, int unit, int bus, union ccb *ccb) { struct atapi_hcb *hcb = (struct atapi_hcb *) malloc(sizeof(struct atapi_hcb), M_ATACAM, M_NOWAIT | M_ZERO); if (hcb != NULL) { hcb->softc = softc; hcb->unit = unit; hcb->bus = bus; hcb->ccb = ccb; } return hcb; } static void free_hcb(struct atapi_hcb *hcb) { if ((hcb->flags & QUEUED) != 0) TAILQ_REMOVE(&hcb->softc->pending_hcbs, hcb, chain); if (hcb->dxfer_alloc != NULL) free(hcb->dxfer_alloc, M_ATACAM); free(hcb, M_ATACAM); } static void free_softc(struct atapi_xpt_softc *scp) { struct atapi_hcb *hcb; GIANT_REQUIRED; if (scp != NULL) { TAILQ_FOREACH(hcb, &scp->pending_hcbs, chain) { free_hcb_and_ccb_done(hcb, CAM_UNREC_HBA_ERROR); } if (scp->path != NULL) { setup_async_cb(scp, 0); xpt_free_path(scp->path); } if ((scp->flags & BUS_REGISTERED) != 0) { if (xpt_bus_deregister(cam_sim_path(scp->sim)) == CAM_REQ_CMP) scp->flags &= ~BUS_REGISTERED; } if (scp->sim != NULL) { if ((scp->flags & BUS_REGISTERED) == 0) cam_sim_free(scp->sim, /*free_devq*/TRUE); else printf("Can't free %s SIM (still registered)\n", cam_sim_name(scp->sim)); } LIST_REMOVE(scp, chain); free(scp, M_ATACAM); } } static struct atapi_xpt_softc * get_softc(struct ata_channel *ata_ch) { struct atapi_xpt_softc *scp = NULL; mtx_lock(&atapicam_softc_mtx); LIST_FOREACH(scp, &all_buses, chain) { if (scp->ata_ch == ata_ch) break; } mtx_unlock(&atapicam_softc_mtx); return scp; } static struct ata_device * get_ata_device(struct atapi_xpt_softc *scp, int id) { int role = ATA_ATAPI_MASTER; switch (id) { case 1: role = ATA_ATAPI_SLAVE; /* FALLTHROUGH */ case 0: if (scp->ata_ch->devices & role) return &scp->ata_ch->device[id]; /* FALLTHROUGH */ default: return NULL; } }