2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2009 Silicon Graphics International Corp.
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8 * modification, are permitted provided that the following conditions
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16 * including a substantially similar Disclaimer requirement for further
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32 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_frontend_cam_sim.c#4 $
35 * CTL frontend to CAM SIM interface. This allows access to CTL LUNs via
36 * the da(4) and pass(4) drivers from inside the system.
38 * Author: Ken Merry <ken@FreeBSD.org>
41 #include <sys/cdefs.h>
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/types.h>
46 #include <sys/malloc.h>
48 #include <sys/sysctl.h>
49 #include <machine/atomic.h>
50 #include <machine/bus.h>
54 #include <cam/cam_ccb.h>
55 #include <cam/cam_sim.h>
56 #include <cam/cam_xpt_sim.h>
57 #include <cam/cam_xpt.h>
58 #include <cam/cam_periph.h>
59 #include <cam/scsi/scsi_all.h>
60 #include <cam/scsi/scsi_message.h>
61 #include <cam/ctl/ctl_io.h>
62 #include <cam/ctl/ctl.h>
63 #include <cam/ctl/ctl_frontend.h>
64 #include <cam/ctl/ctl_debug.h>
66 #define io_ptr spriv_ptr1
76 struct cam_devq *devq;
77 struct cam_path *path;
85 * We can't handle CCBs with these flags. For the most part, we just don't
86 * handle physical addresses yet. That would require mapping things in
87 * order to do the copy.
89 #define CFCS_BAD_CCB_FLAGS (CAM_DATA_ISPHYS | CAM_CDB_PHYS | CAM_SENSE_PTR | \
92 static int cfcs_init(void);
93 static int cfcs_shutdown(void);
94 static void cfcs_poll(struct cam_sim *sim);
95 static void cfcs_online(void *arg);
96 static void cfcs_offline(void *arg);
97 static void cfcs_datamove(union ctl_io *io);
98 static void cfcs_done(union ctl_io *io);
99 void cfcs_action(struct cam_sim *sim, union ccb *ccb);
101 struct cfcs_softc cfcs_softc;
103 * This is primarily intended to allow for error injection to test the CAM
104 * sense data and sense residual handling code. This sets the maximum
105 * amount of SCSI sense data that we will report to CAM.
107 static int cfcs_max_sense = sizeof(struct scsi_sense_data);
109 SYSCTL_NODE(_kern_cam, OID_AUTO, ctl2cam, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
110 "CAM Target Layer SIM frontend");
111 SYSCTL_INT(_kern_cam_ctl2cam, OID_AUTO, max_sense, CTLFLAG_RW,
112 &cfcs_max_sense, 0, "Maximum sense data size");
114 static struct ctl_frontend cfcs_frontend =
118 .shutdown = cfcs_shutdown,
120 CTL_FRONTEND_DECLARE(ctlcfcs, cfcs_frontend);
125 struct cfcs_softc *softc;
126 struct ctl_port *port;
130 bzero(softc, sizeof(*softc));
133 port->frontend = &cfcs_frontend;
134 port->port_type = CTL_PORT_INTERNAL;
135 /* XXX KDM what should the real number be here? */
136 port->num_requested_ctl_io = 4096;
137 snprintf(softc->port_name, sizeof(softc->port_name), "camsim");
138 port->port_name = softc->port_name;
139 port->port_online = cfcs_online;
140 port->port_offline = cfcs_offline;
141 port->onoff_arg = softc;
142 port->fe_datamove = cfcs_datamove;
143 port->fe_done = cfcs_done;
144 port->targ_port = -1;
146 retval = ctl_port_register(port);
148 printf("%s: ctl_port_register() failed with error %d!\n",
154 * If the CTL frontend didn't tell us what our WWNN/WWPN is, go
155 * ahead and set something random.
157 if (port->wwnn == 0) {
158 uint64_t random_bits;
160 arc4rand(&random_bits, sizeof(random_bits), 0);
161 softc->wwnn = (random_bits & 0x0000000fffffff00ULL) |
162 /* Company ID */ 0x5000000000000000ULL |
163 /* NL-Port */ 0x0300;
164 softc->wwpn = softc->wwnn + port->targ_port + 1;
165 ctl_port_set_wwns(port, true, softc->wwnn, true, softc->wwpn);
167 softc->wwnn = port->wwnn;
168 softc->wwpn = port->wwpn;
171 softc->devq = cam_simq_alloc(port->num_requested_ctl_io);
172 if (softc->devq == NULL) {
173 printf("%s: error allocating devq\n", __func__);
178 softc->sim = cam_sim_alloc(cfcs_action, cfcs_poll, softc->port_name,
179 softc, /*unit*/ 0, NULL, 1,
180 port->num_requested_ctl_io, softc->devq);
181 if (softc->sim == NULL) {
182 printf("%s: error allocating SIM\n", __func__);
187 if (xpt_bus_register(softc->sim, NULL, 0) != CAM_SUCCESS) {
188 printf("%s: error registering SIM\n", __func__);
193 if (xpt_create_path(&softc->path, /*periph*/NULL,
194 cam_sim_path(softc->sim),
196 CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
197 printf("%s: error creating path\n", __func__);
198 xpt_bus_deregister(cam_sim_path(softc->sim));
207 cam_sim_free(softc->sim, /*free_devq*/ TRUE);
208 else if (softc->devq)
209 cam_simq_free(softc->devq);
216 struct cfcs_softc *softc = &cfcs_softc;
217 struct ctl_port *port = &softc->port;
220 ctl_port_offline(port);
222 xpt_free_path(softc->path);
223 xpt_bus_deregister(cam_sim_path(softc->sim));
224 cam_sim_free(softc->sim, /*free_devq*/ TRUE);
226 if ((error = ctl_port_deregister(port)) != 0)
227 printf("%s: cam_sim port deregistration failed\n", __func__);
232 cfcs_poll(struct cam_sim *sim)
238 cfcs_onoffline(void *arg, int online)
240 struct cfcs_softc *softc = (struct cfcs_softc *)arg;
243 softc->online = online;
245 ccb = xpt_alloc_ccb_nowait();
247 printf("%s: unable to allocate CCB for rescan\n", __func__);
251 if (xpt_create_path(&ccb->ccb_h.path, NULL,
252 cam_sim_path(softc->sim), CAM_TARGET_WILDCARD,
253 CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
254 printf("%s: can't allocate path for rescan\n", __func__);
262 cfcs_online(void *arg)
264 cfcs_onoffline(arg, /*online*/ 1);
268 cfcs_offline(void *arg)
270 cfcs_onoffline(arg, /*online*/ 0);
274 * This function is very similar to ctl_ioctl_do_datamove(). Is there a
275 * way to combine the functionality?
277 * XXX KDM may need to move this into a thread. We're doing a bcopy in the
278 * caller's context, which will usually be the backend. That may not be a
282 cfcs_datamove(union ctl_io *io)
285 bus_dma_segment_t cam_sg_entry, *cam_sglist;
286 struct ctl_sg_entry ctl_sg_entry, *ctl_sglist;
287 int cam_sg_count, ctl_sg_count, cam_sg_start;
290 int ctl_watermark, cam_watermark;
293 ccb = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
296 * Note that we have a check in cfcs_action() to make sure that any
297 * CCBs with "bad" flags are returned with CAM_REQ_INVALID. This
298 * is just to make sure no one removes that check without updating
299 * this code to provide the additional functionality necessary to
300 * support those modes of operation.
302 KASSERT(((ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS) == 0), ("invalid "
303 "CAM flags %#x", (ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS)));
306 * Simplify things on both sides by putting single buffers into a
307 * single entry S/G list.
309 switch ((ccb->ccb_h.flags & CAM_DATA_MASK)) {
313 cam_sglist = (bus_dma_segment_t *)ccb->csio.data_ptr;
314 cam_sg_count = ccb->csio.sglist_cnt;
315 cam_sg_start = cam_sg_count;
318 for (i = 0, len_seen = 0; i < cam_sg_count; i++) {
319 if ((len_seen + cam_sglist[i].ds_len) >=
320 io->scsiio.kern_rel_offset) {
322 cam_sg_offset = io->scsiio.kern_rel_offset -
326 len_seen += cam_sglist[i].ds_len;
331 cam_sglist = &cam_sg_entry;
332 cam_sglist[0].ds_len = ccb->csio.dxfer_len;
333 cam_sglist[0].ds_addr = (bus_addr_t)(uintptr_t)ccb->csio.data_ptr;
336 cam_sg_offset = io->scsiio.kern_rel_offset;
339 panic("Invalid CAM flags %#x", ccb->ccb_h.flags);
342 if (io->scsiio.kern_sg_entries > 0) {
343 ctl_sglist = (struct ctl_sg_entry *)io->scsiio.kern_data_ptr;
344 ctl_sg_count = io->scsiio.kern_sg_entries;
346 ctl_sglist = &ctl_sg_entry;
347 ctl_sglist->addr = io->scsiio.kern_data_ptr;
348 ctl_sglist->len = io->scsiio.kern_data_len;
353 cam_watermark = cam_sg_offset;
354 for (i = cam_sg_start, j = 0;
355 i < cam_sg_count && j < ctl_sg_count;) {
356 uint8_t *cam_ptr, *ctl_ptr;
358 len_to_copy = MIN(cam_sglist[i].ds_len - cam_watermark,
359 ctl_sglist[j].len - ctl_watermark);
361 cam_ptr = (uint8_t *)(uintptr_t)cam_sglist[i].ds_addr;
362 cam_ptr = cam_ptr + cam_watermark;
363 if (io->io_hdr.flags & CTL_FLAG_BUS_ADDR) {
367 panic("need to implement bus address support");
369 kern_ptr = bus_to_virt(kern_sglist[j].addr);
372 ctl_ptr = (uint8_t *)ctl_sglist[j].addr;
373 ctl_ptr = ctl_ptr + ctl_watermark;
375 if ((io->io_hdr.flags & CTL_FLAG_DATA_MASK) ==
377 CTL_DEBUG_PRINT(("%s: copying %d bytes to CAM\n",
378 __func__, len_to_copy));
379 CTL_DEBUG_PRINT(("%s: from %p to %p\n", ctl_ptr,
381 bcopy(ctl_ptr, cam_ptr, len_to_copy);
383 CTL_DEBUG_PRINT(("%s: copying %d bytes from CAM\n",
384 __func__, len_to_copy));
385 CTL_DEBUG_PRINT(("%s: from %p to %p\n", cam_ptr,
387 bcopy(cam_ptr, ctl_ptr, len_to_copy);
390 io->scsiio.ext_data_filled += len_to_copy;
391 io->scsiio.kern_data_resid -= len_to_copy;
393 cam_watermark += len_to_copy;
394 if (cam_sglist[i].ds_len == cam_watermark) {
399 ctl_watermark += len_to_copy;
400 if (ctl_sglist[j].len == ctl_watermark) {
406 if ((io->io_hdr.status & CTL_STATUS_MASK) == CTL_SUCCESS) {
407 io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = NULL;
408 io->io_hdr.flags |= CTL_FLAG_STATUS_SENT;
409 ccb->csio.resid = ccb->csio.dxfer_len -
410 io->scsiio.ext_data_filled;
411 ccb->ccb_h.status &= ~CAM_STATUS_MASK;
412 ccb->ccb_h.status |= CAM_REQ_CMP;
416 ctl_datamove_done(io, true);
420 cfcs_done(union ctl_io *io)
424 ccb = io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;
431 * At this point we should have status. If we don't, that's a bug.
433 KASSERT(((io->io_hdr.status & CTL_STATUS_MASK) != CTL_STATUS_NONE),
434 ("invalid CTL status %#x", io->io_hdr.status));
437 * Translate CTL status to CAM status.
439 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
440 ccb->csio.resid = ccb->csio.dxfer_len -
441 io->scsiio.ext_data_filled;
443 ccb->ccb_h.status &= ~CAM_STATUS_MASK;
444 switch (io->io_hdr.status & CTL_STATUS_MASK) {
446 ccb->ccb_h.status |= CAM_REQ_CMP;
449 ccb->ccb_h.status |= CAM_SCSI_STATUS_ERROR | CAM_AUTOSNS_VALID;
450 ccb->csio.scsi_status = io->scsiio.scsi_status;
451 bcopy(&io->scsiio.sense_data, &ccb->csio.sense_data,
452 min(io->scsiio.sense_len, ccb->csio.sense_len));
453 if (ccb->csio.sense_len > io->scsiio.sense_len)
454 ccb->csio.sense_resid = ccb->csio.sense_len -
455 io->scsiio.sense_len;
457 ccb->csio.sense_resid = 0;
458 if ((ccb->csio.sense_len - ccb->csio.sense_resid) >
460 ccb->csio.sense_resid = ccb->csio.sense_len -
464 case CTL_CMD_ABORTED:
465 ccb->ccb_h.status |= CAM_REQ_ABORTED;
469 ccb->ccb_h.status |= CAM_REQ_CMP_ERR;
473 if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP &&
474 (ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) {
475 xpt_freeze_devq(ccb->ccb_h.path, 1);
476 ccb->ccb_h.status |= CAM_DEV_QFRZN;
482 cfcs_action(struct cam_sim *sim, union ccb *ccb)
484 struct cfcs_softc *softc;
487 softc = (struct cfcs_softc *)cam_sim_softc(sim);
489 switch (ccb->ccb_h.func_code) {
492 struct ccb_scsiio *csio;
497 * Catch CCB flags, like physical address flags, that
498 * indicate situations we currently can't handle.
500 if (ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS) {
501 ccb->ccb_h.status = CAM_REQ_INVALID;
502 printf("%s: bad CCB flags %#x (all flags %#x)\n",
503 __func__, ccb->ccb_h.flags & CFCS_BAD_CCB_FLAGS,
510 * If we aren't online, there are no devices to see.
512 if (softc->online == 0) {
513 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
518 io = ctl_alloc_io_nowait(softc->port.ctl_pool_ref);
520 printf("%s: can't allocate ctl_io\n", __func__);
521 ccb->ccb_h.status = CAM_BUSY | CAM_DEV_QFRZN;
522 xpt_freeze_devq(ccb->ccb_h.path, 1);
527 /* Save pointers on both sides */
528 io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = ccb;
529 ccb->ccb_h.io_ptr = io;
532 * Only SCSI I/O comes down this path, resets, etc. come
533 * down via the XPT_RESET_BUS/LUN CCBs below.
535 io->io_hdr.io_type = CTL_IO_SCSI;
536 io->io_hdr.nexus.initid = 1;
537 io->io_hdr.nexus.targ_port = softc->port.targ_port;
538 io->io_hdr.nexus.targ_lun = ctl_decode_lun(
539 CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
540 io->scsiio.priority = csio->priority;
542 * This tag scheme isn't the best, since we could in theory
543 * have a very long-lived I/O and tag collision, especially
544 * in a high I/O environment. But it should work well
545 * enough for now. Since we're using unsigned ints,
546 * they'll just wrap around.
548 io->scsiio.tag_num = atomic_fetchadd_32(&softc->cur_tag_num, 1);
549 csio->tag_id = io->scsiio.tag_num;
550 switch (csio->tag_action) {
551 case CAM_TAG_ACTION_NONE:
552 io->scsiio.tag_type = CTL_TAG_UNTAGGED;
554 case MSG_SIMPLE_TASK:
555 io->scsiio.tag_type = CTL_TAG_SIMPLE;
557 case MSG_HEAD_OF_QUEUE_TASK:
558 io->scsiio.tag_type = CTL_TAG_HEAD_OF_QUEUE;
560 case MSG_ORDERED_TASK:
561 io->scsiio.tag_type = CTL_TAG_ORDERED;
564 io->scsiio.tag_type = CTL_TAG_ACA;
567 io->scsiio.tag_type = CTL_TAG_UNTAGGED;
568 printf("%s: unhandled tag type %#x!!\n", __func__,
572 if (csio->cdb_len > sizeof(io->scsiio.cdb)) {
573 printf("%s: WARNING: CDB len %d > ctl_io space %zd\n",
574 __func__, csio->cdb_len, sizeof(io->scsiio.cdb));
576 io->scsiio.cdb_len = min(csio->cdb_len, sizeof(io->scsiio.cdb));
577 bcopy(scsiio_cdb_ptr(csio), io->scsiio.cdb, io->scsiio.cdb_len);
579 ccb->ccb_h.status |= CAM_SIM_QUEUED;
581 if (err != CTL_RETVAL_COMPLETE) {
582 printf("%s: func %d: error %d returned by "
583 "ctl_queue()!\n", __func__,
584 ccb->ccb_h.func_code, err);
586 ccb->ccb_h.status = CAM_REQ_INVALID;
594 union ccb *abort_ccb;
596 abort_ccb = ccb->cab.abort_ccb;
598 if (abort_ccb->ccb_h.func_code != XPT_SCSI_IO) {
599 ccb->ccb_h.status = CAM_REQ_INVALID;
604 * If we aren't online, there are no devices to talk to.
606 if (softc->online == 0) {
607 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
612 io = ctl_alloc_io_nowait(softc->port.ctl_pool_ref);
614 ccb->ccb_h.status = CAM_BUSY | CAM_DEV_QFRZN;
615 xpt_freeze_devq(ccb->ccb_h.path, 1);
621 /* Save pointers on both sides */
622 io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = ccb;
623 ccb->ccb_h.io_ptr = io;
625 io->io_hdr.io_type = CTL_IO_TASK;
626 io->io_hdr.nexus.initid = 1;
627 io->io_hdr.nexus.targ_port = softc->port.targ_port;
628 io->io_hdr.nexus.targ_lun = ctl_decode_lun(
629 CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
630 io->taskio.task_action = CTL_TASK_ABORT_TASK;
631 io->taskio.tag_num = abort_ccb->csio.tag_id;
632 switch (abort_ccb->csio.tag_action) {
633 case CAM_TAG_ACTION_NONE:
634 io->taskio.tag_type = CTL_TAG_UNTAGGED;
636 case MSG_SIMPLE_TASK:
637 io->taskio.tag_type = CTL_TAG_SIMPLE;
639 case MSG_HEAD_OF_QUEUE_TASK:
640 io->taskio.tag_type = CTL_TAG_HEAD_OF_QUEUE;
642 case MSG_ORDERED_TASK:
643 io->taskio.tag_type = CTL_TAG_ORDERED;
646 io->taskio.tag_type = CTL_TAG_ACA;
649 io->taskio.tag_type = CTL_TAG_UNTAGGED;
650 printf("%s: unhandled tag type %#x!!\n", __func__,
651 abort_ccb->csio.tag_action);
655 if (err != CTL_RETVAL_COMPLETE) {
656 printf("%s func %d: error %d returned by "
657 "ctl_queue()!\n", __func__,
658 ccb->ccb_h.func_code, err);
663 case XPT_GET_TRAN_SETTINGS: {
664 struct ccb_trans_settings *cts;
665 struct ccb_trans_settings_scsi *scsi;
666 struct ccb_trans_settings_fc *fc;
669 scsi = &cts->proto_specific.scsi;
670 fc = &cts->xport_specific.fc;
673 cts->protocol = PROTO_SCSI;
674 cts->protocol_version = SCSI_REV_SPC2;
675 cts->transport = XPORT_FC;
676 cts->transport_version = 0;
678 scsi->valid = CTS_SCSI_VALID_TQ;
679 scsi->flags = CTS_SCSI_FLAGS_TAG_ENB;
680 fc->valid = CTS_FC_VALID_SPEED;
681 fc->bitrate = 800000;
682 fc->wwnn = softc->wwnn;
683 fc->wwpn = softc->wwpn;
684 fc->port = softc->port.targ_port;
685 fc->valid |= CTS_FC_VALID_WWNN | CTS_FC_VALID_WWPN |
687 ccb->ccb_h.status = CAM_REQ_CMP;
690 case XPT_SET_TRAN_SETTINGS:
691 /* XXX KDM should we actually do something here? */
692 ccb->ccb_h.status = CAM_REQ_CMP;
695 case XPT_RESET_DEV: {
699 * If we aren't online, there are no devices to talk to.
701 if (softc->online == 0) {
702 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
707 io = ctl_alloc_io_nowait(softc->port.ctl_pool_ref);
709 ccb->ccb_h.status = CAM_BUSY | CAM_DEV_QFRZN;
710 xpt_freeze_devq(ccb->ccb_h.path, 1);
716 /* Save pointers on both sides */
717 if (ccb->ccb_h.func_code == XPT_RESET_DEV)
718 io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = ccb;
719 ccb->ccb_h.io_ptr = io;
721 io->io_hdr.io_type = CTL_IO_TASK;
722 io->io_hdr.nexus.initid = 1;
723 io->io_hdr.nexus.targ_port = softc->port.targ_port;
724 io->io_hdr.nexus.targ_lun = ctl_decode_lun(
725 CAM_EXTLUN_BYTE_SWIZZLE(ccb->ccb_h.target_lun));
726 if (ccb->ccb_h.func_code == XPT_RESET_BUS)
727 io->taskio.task_action = CTL_TASK_BUS_RESET;
729 io->taskio.task_action = CTL_TASK_LUN_RESET;
732 if (err != CTL_RETVAL_COMPLETE) {
733 printf("%s func %d: error %d returned by "
734 "ctl_queue()!\n", __func__,
735 ccb->ccb_h.func_code, err);
740 case XPT_CALC_GEOMETRY:
741 cam_calc_geometry(&ccb->ccg, 1);
745 struct ccb_pathinq *cpi;
749 cpi->version_num = 0;
750 cpi->hba_inquiry = PI_TAG_ABLE;
751 cpi->target_sprt = 0;
752 cpi->hba_misc = PIM_EXTLUNS;
753 cpi->hba_eng_cnt = 0;
756 /* Do we really have a limit? */
757 cpi->maxio = 1024 * 1024;
758 cpi->async_flags = 0;
760 cpi->initiator_id = 1;
762 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
763 strlcpy(cpi->hba_vid, "FreeBSD", HBA_IDLEN);
764 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
765 cpi->unit_number = 0;
767 cpi->base_transfer_speed = 800000;
768 cpi->protocol = PROTO_SCSI;
769 cpi->protocol_version = SCSI_REV_SPC2;
771 * Pretend to be Fibre Channel.
773 cpi->transport = XPORT_FC;
774 cpi->transport_version = 0;
775 cpi->xport_specific.fc.wwnn = softc->wwnn;
776 cpi->xport_specific.fc.wwpn = softc->wwpn;
777 cpi->xport_specific.fc.port = softc->port.targ_port;
778 cpi->xport_specific.fc.bitrate = 8 * 1000 * 1000;
779 cpi->ccb_h.status = CAM_REQ_CMP;
783 ccb->ccb_h.status = CAM_PROVIDE_FAIL;
784 printf("%s: unsupported CCB type %#x\n", __func__,
785 ccb->ccb_h.func_code);