4 * Copyright IBM, Corp. 2010
5 * Copyright Red Hat, Inc. 2011
8 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
9 * Paolo Bonzini <pbonzini@redhat.com>
11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
12 * See the COPYING file in the top-level directory.
16 #include "qemu/osdep.h"
17 #include "qapi/error.h"
18 #include "standard-headers/linux/virtio_ids.h"
19 #include "hw/virtio/virtio-scsi.h"
20 #include "migration/qemu-file-types.h"
21 #include "qemu/error-report.h"
23 #include "qemu/module.h"
24 #include "sysemu/block-backend.h"
25 #include "hw/qdev-properties.h"
26 #include "hw/scsi/scsi.h"
27 #include "scsi/constants.h"
28 #include "hw/virtio/virtio-bus.h"
29 #include "hw/virtio/virtio-access.h"
32 static inline int virtio_scsi_get_lun(uint8_t *lun
)
34 return ((lun
[2] << 8) | lun
[3]) & 0x3FFF;
37 static inline SCSIDevice
*virtio_scsi_device_get(VirtIOSCSI
*s
, uint8_t *lun
)
42 if (lun
[2] != 0 && !(lun
[2] >= 0x40 && lun
[2] < 0x80)) {
45 return scsi_device_get(&s
->bus
, 0, lun
[1], virtio_scsi_get_lun(lun
));
48 void virtio_scsi_init_req(VirtIOSCSI
*s
, VirtQueue
*vq
, VirtIOSCSIReq
*req
)
50 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
51 const size_t zero_skip
=
52 offsetof(VirtIOSCSIReq
, resp_iov
) + sizeof(req
->resp_iov
);
56 qemu_sglist_init(&req
->qsgl
, DEVICE(s
), 8, vdev
->dma_as
);
57 qemu_iovec_init(&req
->resp_iov
, 1);
58 memset((uint8_t *)req
+ zero_skip
, 0, sizeof(*req
) - zero_skip
);
61 void virtio_scsi_free_req(VirtIOSCSIReq
*req
)
63 qemu_iovec_destroy(&req
->resp_iov
);
64 qemu_sglist_destroy(&req
->qsgl
);
68 static void virtio_scsi_complete_req(VirtIOSCSIReq
*req
)
70 VirtIOSCSI
*s
= req
->dev
;
71 VirtQueue
*vq
= req
->vq
;
72 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
74 qemu_iovec_from_buf(&req
->resp_iov
, 0, &req
->resp
, req
->resp_size
);
75 virtqueue_push(vq
, &req
->elem
, req
->qsgl
.size
+ req
->resp_iov
.size
);
76 if (s
->dataplane_started
&& !s
->dataplane_fenced
) {
77 virtio_notify_irqfd(vdev
, vq
);
79 virtio_notify(vdev
, vq
);
83 req
->sreq
->hba_private
= NULL
;
84 scsi_req_unref(req
->sreq
);
86 virtio_scsi_free_req(req
);
89 static void virtio_scsi_bad_req(VirtIOSCSIReq
*req
)
91 virtio_error(VIRTIO_DEVICE(req
->dev
), "wrong size for virtio-scsi headers");
92 virtqueue_detach_element(req
->vq
, &req
->elem
, 0);
93 virtio_scsi_free_req(req
);
96 static size_t qemu_sgl_concat(VirtIOSCSIReq
*req
, struct iovec
*iov
,
97 hwaddr
*addr
, int num
, size_t skip
)
99 QEMUSGList
*qsgl
= &req
->qsgl
;
103 if (skip
>= iov
->iov_len
) {
104 skip
-= iov
->iov_len
;
106 qemu_sglist_add(qsgl
, *addr
+ skip
, iov
->iov_len
- skip
);
107 copied
+= iov
->iov_len
- skip
;
119 static int virtio_scsi_parse_req(VirtIOSCSIReq
*req
,
120 unsigned req_size
, unsigned resp_size
)
122 VirtIODevice
*vdev
= (VirtIODevice
*) req
->dev
;
123 size_t in_size
, out_size
;
125 if (iov_to_buf(req
->elem
.out_sg
, req
->elem
.out_num
, 0,
126 &req
->req
, req_size
) < req_size
) {
130 if (qemu_iovec_concat_iov(&req
->resp_iov
,
131 req
->elem
.in_sg
, req
->elem
.in_num
, 0,
132 resp_size
) < resp_size
) {
136 req
->resp_size
= resp_size
;
138 /* Old BIOSes left some padding by mistake after the req_size/resp_size.
139 * As a workaround, always consider the first buffer as the virtio-scsi
140 * request/response, making the payload start at the second element
143 * The actual length of the response header, stored in req->resp_size,
146 * TODO: always disable this workaround for virtio 1.0 devices.
148 if (!virtio_vdev_has_feature(vdev
, VIRTIO_F_ANY_LAYOUT
)) {
149 if (req
->elem
.out_num
) {
150 req_size
= req
->elem
.out_sg
[0].iov_len
;
152 if (req
->elem
.in_num
) {
153 resp_size
= req
->elem
.in_sg
[0].iov_len
;
157 out_size
= qemu_sgl_concat(req
, req
->elem
.out_sg
,
158 &req
->elem
.out_addr
[0], req
->elem
.out_num
,
160 in_size
= qemu_sgl_concat(req
, req
->elem
.in_sg
,
161 &req
->elem
.in_addr
[0], req
->elem
.in_num
,
164 if (out_size
&& in_size
) {
169 req
->mode
= SCSI_XFER_TO_DEV
;
170 } else if (in_size
) {
171 req
->mode
= SCSI_XFER_FROM_DEV
;
177 static VirtIOSCSIReq
*virtio_scsi_pop_req(VirtIOSCSI
*s
, VirtQueue
*vq
)
179 VirtIOSCSICommon
*vs
= (VirtIOSCSICommon
*)s
;
182 req
= virtqueue_pop(vq
, sizeof(VirtIOSCSIReq
) + vs
->cdb_size
);
186 virtio_scsi_init_req(s
, vq
, req
);
190 static void virtio_scsi_save_request(QEMUFile
*f
, SCSIRequest
*sreq
)
192 VirtIOSCSIReq
*req
= sreq
->hba_private
;
193 VirtIOSCSICommon
*vs
= VIRTIO_SCSI_COMMON(req
->dev
);
194 VirtIODevice
*vdev
= VIRTIO_DEVICE(req
->dev
);
195 uint32_t n
= virtio_get_queue_index(req
->vq
) - VIRTIO_SCSI_VQ_NUM_FIXED
;
197 assert(n
< vs
->conf
.num_queues
);
198 qemu_put_be32s(f
, &n
);
199 qemu_put_virtqueue_element(vdev
, f
, &req
->elem
);
202 static void *virtio_scsi_load_request(QEMUFile
*f
, SCSIRequest
*sreq
)
204 SCSIBus
*bus
= sreq
->bus
;
205 VirtIOSCSI
*s
= container_of(bus
, VirtIOSCSI
, bus
);
206 VirtIOSCSICommon
*vs
= VIRTIO_SCSI_COMMON(s
);
207 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
211 qemu_get_be32s(f
, &n
);
212 assert(n
< vs
->conf
.num_queues
);
213 req
= qemu_get_virtqueue_element(vdev
, f
,
214 sizeof(VirtIOSCSIReq
) + vs
->cdb_size
);
215 virtio_scsi_init_req(s
, vs
->cmd_vqs
[n
], req
);
217 if (virtio_scsi_parse_req(req
, sizeof(VirtIOSCSICmdReq
) + vs
->cdb_size
,
218 sizeof(VirtIOSCSICmdResp
) + vs
->sense_size
) < 0) {
219 error_report("invalid SCSI request migration data");
225 if (req
->sreq
->cmd
.mode
!= SCSI_XFER_NONE
) {
226 assert(req
->sreq
->cmd
.mode
== req
->mode
);
233 VirtIOSCSIReq
*tmf_req
;
234 } VirtIOSCSICancelNotifier
;
236 static void virtio_scsi_cancel_notify(Notifier
*notifier
, void *data
)
238 VirtIOSCSICancelNotifier
*n
= container_of(notifier
,
239 VirtIOSCSICancelNotifier
,
242 if (--n
->tmf_req
->remaining
== 0) {
243 VirtIOSCSIReq
*req
= n
->tmf_req
;
245 trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req
->req
.tmf
.lun
),
246 req
->req
.tmf
.tag
, req
->resp
.tmf
.response
);
247 virtio_scsi_complete_req(req
);
252 static inline void virtio_scsi_ctx_check(VirtIOSCSI
*s
, SCSIDevice
*d
)
254 if (s
->dataplane_started
&& d
&& blk_is_available(d
->conf
.blk
)) {
255 assert(blk_get_aio_context(d
->conf
.blk
) == s
->ctx
);
259 /* Return 0 if the request is ready to be completed and return to guest;
260 * -EINPROGRESS if the request is submitted and will be completed later, in the
261 * case of async cancellation. */
262 static int virtio_scsi_do_tmf(VirtIOSCSI
*s
, VirtIOSCSIReq
*req
)
264 SCSIDevice
*d
= virtio_scsi_device_get(s
, req
->req
.tmf
.lun
);
265 SCSIRequest
*r
, *next
;
270 virtio_scsi_ctx_check(s
, d
);
271 /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
272 req
->resp
.tmf
.response
= VIRTIO_SCSI_S_OK
;
275 * req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s()
276 * to avoid compiler errors.
278 req
->req
.tmf
.subtype
=
279 virtio_tswap32(VIRTIO_DEVICE(s
), req
->req
.tmf
.subtype
);
281 trace_virtio_scsi_tmf_req(virtio_scsi_get_lun(req
->req
.tmf
.lun
),
282 req
->req
.tmf
.tag
, req
->req
.tmf
.subtype
);
284 switch (req
->req
.tmf
.subtype
) {
285 case VIRTIO_SCSI_T_TMF_ABORT_TASK
:
286 case VIRTIO_SCSI_T_TMF_QUERY_TASK
:
290 if (d
->lun
!= virtio_scsi_get_lun(req
->req
.tmf
.lun
)) {
293 QTAILQ_FOREACH_SAFE(r
, &d
->requests
, next
, next
) {
294 VirtIOSCSIReq
*cmd_req
= r
->hba_private
;
295 if (cmd_req
&& cmd_req
->req
.cmd
.tag
== req
->req
.tmf
.tag
) {
301 * Assert that the request has not been completed yet, we
302 * check for it in the loop above.
304 assert(r
->hba_private
);
305 if (req
->req
.tmf
.subtype
== VIRTIO_SCSI_T_TMF_QUERY_TASK
) {
306 /* "If the specified command is present in the task set, then
307 * return a service response set to FUNCTION SUCCEEDED".
309 req
->resp
.tmf
.response
= VIRTIO_SCSI_S_FUNCTION_SUCCEEDED
;
311 VirtIOSCSICancelNotifier
*notifier
;
314 notifier
= g_new(VirtIOSCSICancelNotifier
, 1);
315 notifier
->tmf_req
= req
;
316 notifier
->notifier
.notify
= virtio_scsi_cancel_notify
;
317 scsi_req_cancel_async(r
, ¬ifier
->notifier
);
323 case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET
:
327 if (d
->lun
!= virtio_scsi_get_lun(req
->req
.tmf
.lun
)) {
331 qdev_reset_all(&d
->qdev
);
335 case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET
:
336 case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET
:
337 case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET
:
341 if (d
->lun
!= virtio_scsi_get_lun(req
->req
.tmf
.lun
)) {
345 /* Add 1 to "remaining" until virtio_scsi_do_tmf returns.
346 * This way, if the bus starts calling back to the notifiers
347 * even before we finish the loop, virtio_scsi_cancel_notify
348 * will not complete the TMF too early.
351 QTAILQ_FOREACH_SAFE(r
, &d
->requests
, next
, next
) {
352 if (r
->hba_private
) {
353 if (req
->req
.tmf
.subtype
== VIRTIO_SCSI_T_TMF_QUERY_TASK_SET
) {
354 /* "If there is any command present in the task set, then
355 * return a service response set to FUNCTION SUCCEEDED".
357 req
->resp
.tmf
.response
= VIRTIO_SCSI_S_FUNCTION_SUCCEEDED
;
360 VirtIOSCSICancelNotifier
*notifier
;
363 notifier
= g_new(VirtIOSCSICancelNotifier
, 1);
364 notifier
->notifier
.notify
= virtio_scsi_cancel_notify
;
365 notifier
->tmf_req
= req
;
366 scsi_req_cancel_async(r
, ¬ifier
->notifier
);
370 if (--req
->remaining
> 0) {
375 case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET
:
376 target
= req
->req
.tmf
.lun
[1];
380 QTAILQ_FOREACH_RCU(kid
, &s
->bus
.qbus
.children
, sibling
) {
381 SCSIDevice
*d1
= SCSI_DEVICE(kid
->child
);
382 if (d1
->channel
== 0 && d1
->id
== target
) {
383 qdev_reset_all(&d1
->qdev
);
391 case VIRTIO_SCSI_T_TMF_CLEAR_ACA
:
393 req
->resp
.tmf
.response
= VIRTIO_SCSI_S_FUNCTION_REJECTED
;
397 object_unref(OBJECT(d
));
401 req
->resp
.tmf
.response
= VIRTIO_SCSI_S_INCORRECT_LUN
;
402 object_unref(OBJECT(d
));
406 req
->resp
.tmf
.response
= VIRTIO_SCSI_S_BAD_TARGET
;
407 object_unref(OBJECT(d
));
411 static void virtio_scsi_handle_ctrl_req(VirtIOSCSI
*s
, VirtIOSCSIReq
*req
)
413 VirtIODevice
*vdev
= (VirtIODevice
*)s
;
417 if (iov_to_buf(req
->elem
.out_sg
, req
->elem
.out_num
, 0,
418 &type
, sizeof(type
)) < sizeof(type
)) {
419 virtio_scsi_bad_req(req
);
423 virtio_tswap32s(vdev
, &type
);
424 if (type
== VIRTIO_SCSI_T_TMF
) {
425 if (virtio_scsi_parse_req(req
, sizeof(VirtIOSCSICtrlTMFReq
),
426 sizeof(VirtIOSCSICtrlTMFResp
)) < 0) {
427 virtio_scsi_bad_req(req
);
430 r
= virtio_scsi_do_tmf(s
, req
);
433 } else if (type
== VIRTIO_SCSI_T_AN_QUERY
||
434 type
== VIRTIO_SCSI_T_AN_SUBSCRIBE
) {
435 if (virtio_scsi_parse_req(req
, sizeof(VirtIOSCSICtrlANReq
),
436 sizeof(VirtIOSCSICtrlANResp
)) < 0) {
437 virtio_scsi_bad_req(req
);
440 req
->req
.an
.event_requested
=
441 virtio_tswap32(VIRTIO_DEVICE(s
), req
->req
.an
.event_requested
);
442 trace_virtio_scsi_an_req(virtio_scsi_get_lun(req
->req
.an
.lun
),
443 req
->req
.an
.event_requested
);
444 req
->resp
.an
.event_actual
= 0;
445 req
->resp
.an
.response
= VIRTIO_SCSI_S_OK
;
449 if (type
== VIRTIO_SCSI_T_TMF
)
450 trace_virtio_scsi_tmf_resp(virtio_scsi_get_lun(req
->req
.tmf
.lun
),
452 req
->resp
.tmf
.response
);
453 else if (type
== VIRTIO_SCSI_T_AN_QUERY
||
454 type
== VIRTIO_SCSI_T_AN_SUBSCRIBE
)
455 trace_virtio_scsi_an_resp(virtio_scsi_get_lun(req
->req
.an
.lun
),
456 req
->resp
.an
.response
);
457 virtio_scsi_complete_req(req
);
459 assert(r
== -EINPROGRESS
);
463 bool virtio_scsi_handle_ctrl_vq(VirtIOSCSI
*s
, VirtQueue
*vq
)
466 bool progress
= false;
468 while ((req
= virtio_scsi_pop_req(s
, vq
))) {
470 virtio_scsi_handle_ctrl_req(s
, req
);
475 static void virtio_scsi_handle_ctrl(VirtIODevice
*vdev
, VirtQueue
*vq
)
477 VirtIOSCSI
*s
= (VirtIOSCSI
*)vdev
;
480 virtio_device_start_ioeventfd(vdev
);
481 if (!s
->dataplane_fenced
) {
485 virtio_scsi_acquire(s
);
486 virtio_scsi_handle_ctrl_vq(s
, vq
);
487 virtio_scsi_release(s
);
490 static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq
*req
)
492 trace_virtio_scsi_cmd_resp(virtio_scsi_get_lun(req
->req
.cmd
.lun
),
494 req
->resp
.cmd
.response
,
495 req
->resp
.cmd
.status
);
496 /* Sense data is not in req->resp and is copied separately
497 * in virtio_scsi_command_complete.
499 req
->resp_size
= sizeof(VirtIOSCSICmdResp
);
500 virtio_scsi_complete_req(req
);
503 static void virtio_scsi_command_failed(SCSIRequest
*r
)
505 VirtIOSCSIReq
*req
= r
->hba_private
;
507 if (r
->io_canceled
) {
511 req
->resp
.cmd
.status
= GOOD
;
512 switch (r
->host_status
) {
513 case SCSI_HOST_NO_LUN
:
514 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_INCORRECT_LUN
;
517 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_BUSY
;
519 case SCSI_HOST_TIME_OUT
:
520 case SCSI_HOST_ABORTED
:
521 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_ABORTED
;
523 case SCSI_HOST_BAD_RESPONSE
:
524 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_BAD_TARGET
;
526 case SCSI_HOST_RESET
:
527 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_RESET
;
529 case SCSI_HOST_TRANSPORT_DISRUPTED
:
530 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_TRANSPORT_FAILURE
;
532 case SCSI_HOST_TARGET_FAILURE
:
533 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_TARGET_FAILURE
;
535 case SCSI_HOST_RESERVATION_ERROR
:
536 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_NEXUS_FAILURE
;
538 case SCSI_HOST_ALLOCATION_FAILURE
:
539 case SCSI_HOST_MEDIUM_ERROR
:
540 case SCSI_HOST_ERROR
:
542 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_FAILURE
;
545 virtio_scsi_complete_cmd_req(req
);
548 static void virtio_scsi_command_complete(SCSIRequest
*r
, size_t resid
)
550 VirtIOSCSIReq
*req
= r
->hba_private
;
551 uint8_t sense
[SCSI_SENSE_BUF_SIZE
];
553 VirtIODevice
*vdev
= VIRTIO_DEVICE(req
->dev
);
555 if (r
->io_canceled
) {
559 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_OK
;
560 req
->resp
.cmd
.status
= r
->status
;
561 if (req
->resp
.cmd
.status
== GOOD
) {
562 req
->resp
.cmd
.resid
= virtio_tswap32(vdev
, resid
);
564 req
->resp
.cmd
.resid
= 0;
565 sense_len
= scsi_req_get_sense(r
, sense
, sizeof(sense
));
566 sense_len
= MIN(sense_len
, req
->resp_iov
.size
- sizeof(req
->resp
.cmd
));
567 qemu_iovec_from_buf(&req
->resp_iov
, sizeof(req
->resp
.cmd
),
569 req
->resp
.cmd
.sense_len
= virtio_tswap32(vdev
, sense_len
);
571 virtio_scsi_complete_cmd_req(req
);
574 static int virtio_scsi_parse_cdb(SCSIDevice
*dev
, SCSICommand
*cmd
,
575 uint8_t *buf
, void *hba_private
)
577 VirtIOSCSIReq
*req
= hba_private
;
580 cmd
->len
= MIN(VIRTIO_SCSI_CDB_DEFAULT_SIZE
, SCSI_CMD_BUF_SIZE
);
581 memcpy(cmd
->buf
, buf
, cmd
->len
);
584 /* Extract the direction and mode directly from the request, for
585 * host device passthrough.
587 cmd
->xfer
= req
->qsgl
.size
;
588 cmd
->mode
= req
->mode
;
592 static QEMUSGList
*virtio_scsi_get_sg_list(SCSIRequest
*r
)
594 VirtIOSCSIReq
*req
= r
->hba_private
;
599 static void virtio_scsi_request_cancelled(SCSIRequest
*r
)
601 VirtIOSCSIReq
*req
= r
->hba_private
;
606 if (req
->dev
->resetting
) {
607 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_RESET
;
609 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_ABORTED
;
611 virtio_scsi_complete_cmd_req(req
);
614 static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq
*req
)
616 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_FAILURE
;
617 virtio_scsi_complete_cmd_req(req
);
620 static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI
*s
, VirtIOSCSIReq
*req
)
622 VirtIOSCSICommon
*vs
= &s
->parent_obj
;
626 rc
= virtio_scsi_parse_req(req
, sizeof(VirtIOSCSICmdReq
) + vs
->cdb_size
,
627 sizeof(VirtIOSCSICmdResp
) + vs
->sense_size
);
629 if (rc
== -ENOTSUP
) {
630 virtio_scsi_fail_cmd_req(req
);
633 virtio_scsi_bad_req(req
);
637 trace_virtio_scsi_cmd_req(virtio_scsi_get_lun(req
->req
.cmd
.lun
),
638 req
->req
.cmd
.tag
, req
->req
.cmd
.cdb
[0]);
640 d
= virtio_scsi_device_get(s
, req
->req
.cmd
.lun
);
642 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_BAD_TARGET
;
643 virtio_scsi_complete_cmd_req(req
);
646 virtio_scsi_ctx_check(s
, d
);
647 req
->sreq
= scsi_req_new(d
, req
->req
.cmd
.tag
,
648 virtio_scsi_get_lun(req
->req
.cmd
.lun
),
649 req
->req
.cmd
.cdb
, req
);
651 if (req
->sreq
->cmd
.mode
!= SCSI_XFER_NONE
652 && (req
->sreq
->cmd
.mode
!= req
->mode
||
653 req
->sreq
->cmd
.xfer
> req
->qsgl
.size
)) {
654 req
->resp
.cmd
.response
= VIRTIO_SCSI_S_OVERRUN
;
655 virtio_scsi_complete_cmd_req(req
);
656 object_unref(OBJECT(d
));
659 scsi_req_ref(req
->sreq
);
660 blk_io_plug(d
->conf
.blk
);
661 object_unref(OBJECT(d
));
665 static void virtio_scsi_handle_cmd_req_submit(VirtIOSCSI
*s
, VirtIOSCSIReq
*req
)
667 SCSIRequest
*sreq
= req
->sreq
;
668 if (scsi_req_enqueue(sreq
)) {
669 scsi_req_continue(sreq
);
671 blk_io_unplug(sreq
->dev
->conf
.blk
);
672 scsi_req_unref(sreq
);
675 bool virtio_scsi_handle_cmd_vq(VirtIOSCSI
*s
, VirtQueue
*vq
)
677 VirtIOSCSIReq
*req
, *next
;
679 bool suppress_notifications
= virtio_queue_get_notification(vq
);
680 bool progress
= false;
682 QTAILQ_HEAD(, VirtIOSCSIReq
) reqs
= QTAILQ_HEAD_INITIALIZER(reqs
);
685 if (suppress_notifications
) {
686 virtio_queue_set_notification(vq
, 0);
689 while ((req
= virtio_scsi_pop_req(s
, vq
))) {
691 ret
= virtio_scsi_handle_cmd_req_prepare(s
, req
);
693 QTAILQ_INSERT_TAIL(&reqs
, req
, next
);
694 } else if (ret
== -EINVAL
) {
695 /* The device is broken and shouldn't process any request */
696 while (!QTAILQ_EMPTY(&reqs
)) {
697 req
= QTAILQ_FIRST(&reqs
);
698 QTAILQ_REMOVE(&reqs
, req
, next
);
699 blk_io_unplug(req
->sreq
->dev
->conf
.blk
);
700 scsi_req_unref(req
->sreq
);
701 virtqueue_detach_element(req
->vq
, &req
->elem
, 0);
702 virtio_scsi_free_req(req
);
707 if (suppress_notifications
) {
708 virtio_queue_set_notification(vq
, 1);
710 } while (ret
!= -EINVAL
&& !virtio_queue_empty(vq
));
712 QTAILQ_FOREACH_SAFE(req
, &reqs
, next
, next
) {
713 virtio_scsi_handle_cmd_req_submit(s
, req
);
718 static void virtio_scsi_handle_cmd(VirtIODevice
*vdev
, VirtQueue
*vq
)
720 /* use non-QOM casts in the data path */
721 VirtIOSCSI
*s
= (VirtIOSCSI
*)vdev
;
723 if (s
->ctx
&& !s
->dataplane_started
) {
724 virtio_device_start_ioeventfd(vdev
);
725 if (!s
->dataplane_fenced
) {
729 virtio_scsi_acquire(s
);
730 virtio_scsi_handle_cmd_vq(s
, vq
);
731 virtio_scsi_release(s
);
734 static void virtio_scsi_get_config(VirtIODevice
*vdev
,
737 VirtIOSCSIConfig
*scsiconf
= (VirtIOSCSIConfig
*)config
;
738 VirtIOSCSICommon
*s
= VIRTIO_SCSI_COMMON(vdev
);
740 virtio_stl_p(vdev
, &scsiconf
->num_queues
, s
->conf
.num_queues
);
741 virtio_stl_p(vdev
, &scsiconf
->seg_max
,
742 s
->conf
.seg_max_adjust
? s
->conf
.virtqueue_size
- 2 : 128 - 2);
743 virtio_stl_p(vdev
, &scsiconf
->max_sectors
, s
->conf
.max_sectors
);
744 virtio_stl_p(vdev
, &scsiconf
->cmd_per_lun
, s
->conf
.cmd_per_lun
);
745 virtio_stl_p(vdev
, &scsiconf
->event_info_size
, sizeof(VirtIOSCSIEvent
));
746 virtio_stl_p(vdev
, &scsiconf
->sense_size
, s
->sense_size
);
747 virtio_stl_p(vdev
, &scsiconf
->cdb_size
, s
->cdb_size
);
748 virtio_stw_p(vdev
, &scsiconf
->max_channel
, VIRTIO_SCSI_MAX_CHANNEL
);
749 virtio_stw_p(vdev
, &scsiconf
->max_target
, VIRTIO_SCSI_MAX_TARGET
);
750 virtio_stl_p(vdev
, &scsiconf
->max_lun
, VIRTIO_SCSI_MAX_LUN
);
753 static void virtio_scsi_set_config(VirtIODevice
*vdev
,
754 const uint8_t *config
)
756 VirtIOSCSIConfig
*scsiconf
= (VirtIOSCSIConfig
*)config
;
757 VirtIOSCSICommon
*vs
= VIRTIO_SCSI_COMMON(vdev
);
759 if ((uint32_t) virtio_ldl_p(vdev
, &scsiconf
->sense_size
) >= 65536 ||
760 (uint32_t) virtio_ldl_p(vdev
, &scsiconf
->cdb_size
) >= 256) {
762 "bad data written to virtio-scsi configuration space");
766 vs
->sense_size
= virtio_ldl_p(vdev
, &scsiconf
->sense_size
);
767 vs
->cdb_size
= virtio_ldl_p(vdev
, &scsiconf
->cdb_size
);
770 static uint64_t virtio_scsi_get_features(VirtIODevice
*vdev
,
771 uint64_t requested_features
,
774 VirtIOSCSI
*s
= VIRTIO_SCSI(vdev
);
776 /* Firstly sync all virtio-scsi possible supported features */
777 requested_features
|= s
->host_features
;
778 return requested_features
;
781 static void virtio_scsi_reset(VirtIODevice
*vdev
)
783 VirtIOSCSI
*s
= VIRTIO_SCSI(vdev
);
784 VirtIOSCSICommon
*vs
= VIRTIO_SCSI_COMMON(vdev
);
786 assert(!s
->dataplane_started
);
788 qbus_reset_all(BUS(&s
->bus
));
791 vs
->sense_size
= VIRTIO_SCSI_SENSE_DEFAULT_SIZE
;
792 vs
->cdb_size
= VIRTIO_SCSI_CDB_DEFAULT_SIZE
;
793 s
->events_dropped
= false;
796 void virtio_scsi_push_event(VirtIOSCSI
*s
, SCSIDevice
*dev
,
797 uint32_t event
, uint32_t reason
)
799 VirtIOSCSICommon
*vs
= VIRTIO_SCSI_COMMON(s
);
801 VirtIOSCSIEvent
*evt
;
802 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
804 if (!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
808 req
= virtio_scsi_pop_req(s
, vs
->event_vq
);
810 s
->events_dropped
= true;
814 if (s
->events_dropped
) {
815 event
|= VIRTIO_SCSI_T_EVENTS_MISSED
;
816 s
->events_dropped
= false;
819 if (virtio_scsi_parse_req(req
, 0, sizeof(VirtIOSCSIEvent
))) {
820 virtio_scsi_bad_req(req
);
824 evt
= &req
->resp
.event
;
825 memset(evt
, 0, sizeof(VirtIOSCSIEvent
));
826 evt
->event
= virtio_tswap32(vdev
, event
);
827 evt
->reason
= virtio_tswap32(vdev
, reason
);
829 assert(event
== VIRTIO_SCSI_T_EVENTS_MISSED
);
832 evt
->lun
[1] = dev
->id
;
834 /* Linux wants us to keep the same encoding we use for REPORT LUNS. */
835 if (dev
->lun
>= 256) {
836 evt
->lun
[2] = (dev
->lun
>> 8) | 0x40;
838 evt
->lun
[3] = dev
->lun
& 0xFF;
840 trace_virtio_scsi_event(virtio_scsi_get_lun(evt
->lun
), event
, reason
);
842 virtio_scsi_complete_req(req
);
845 bool virtio_scsi_handle_event_vq(VirtIOSCSI
*s
, VirtQueue
*vq
)
847 if (s
->events_dropped
) {
848 virtio_scsi_push_event(s
, NULL
, VIRTIO_SCSI_T_NO_EVENT
, 0);
854 static void virtio_scsi_handle_event(VirtIODevice
*vdev
, VirtQueue
*vq
)
856 VirtIOSCSI
*s
= VIRTIO_SCSI(vdev
);
859 virtio_device_start_ioeventfd(vdev
);
860 if (!s
->dataplane_fenced
) {
864 virtio_scsi_acquire(s
);
865 virtio_scsi_handle_event_vq(s
, vq
);
866 virtio_scsi_release(s
);
869 static void virtio_scsi_change(SCSIBus
*bus
, SCSIDevice
*dev
, SCSISense sense
)
871 VirtIOSCSI
*s
= container_of(bus
, VirtIOSCSI
, bus
);
872 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
874 if (virtio_vdev_has_feature(vdev
, VIRTIO_SCSI_F_CHANGE
) &&
875 dev
->type
!= TYPE_ROM
) {
876 virtio_scsi_acquire(s
);
877 virtio_scsi_push_event(s
, dev
, VIRTIO_SCSI_T_PARAM_CHANGE
,
878 sense
.asc
| (sense
.ascq
<< 8));
879 virtio_scsi_release(s
);
883 static void virtio_scsi_pre_hotplug(HotplugHandler
*hotplug_dev
,
884 DeviceState
*dev
, Error
**errp
)
886 SCSIDevice
*sd
= SCSI_DEVICE(dev
);
887 sd
->hba_supports_iothread
= true;
890 static void virtio_scsi_hotplug(HotplugHandler
*hotplug_dev
, DeviceState
*dev
,
893 VirtIODevice
*vdev
= VIRTIO_DEVICE(hotplug_dev
);
894 VirtIOSCSI
*s
= VIRTIO_SCSI(vdev
);
895 SCSIDevice
*sd
= SCSI_DEVICE(dev
);
896 AioContext
*old_context
;
899 if (s
->ctx
&& !s
->dataplane_fenced
) {
900 if (blk_op_is_blocked(sd
->conf
.blk
, BLOCK_OP_TYPE_DATAPLANE
, errp
)) {
903 old_context
= blk_get_aio_context(sd
->conf
.blk
);
904 aio_context_acquire(old_context
);
905 ret
= blk_set_aio_context(sd
->conf
.blk
, s
->ctx
, errp
);
906 aio_context_release(old_context
);
912 if (virtio_vdev_has_feature(vdev
, VIRTIO_SCSI_F_HOTPLUG
)) {
913 virtio_scsi_acquire(s
);
914 virtio_scsi_push_event(s
, sd
,
915 VIRTIO_SCSI_T_TRANSPORT_RESET
,
916 VIRTIO_SCSI_EVT_RESET_RESCAN
);
917 virtio_scsi_release(s
);
921 static void virtio_scsi_hotunplug(HotplugHandler
*hotplug_dev
, DeviceState
*dev
,
924 VirtIODevice
*vdev
= VIRTIO_DEVICE(hotplug_dev
);
925 VirtIOSCSI
*s
= VIRTIO_SCSI(vdev
);
926 SCSIDevice
*sd
= SCSI_DEVICE(dev
);
927 AioContext
*ctx
= s
->ctx
?: qemu_get_aio_context();
929 if (virtio_vdev_has_feature(vdev
, VIRTIO_SCSI_F_HOTPLUG
)) {
930 virtio_scsi_acquire(s
);
931 virtio_scsi_push_event(s
, sd
,
932 VIRTIO_SCSI_T_TRANSPORT_RESET
,
933 VIRTIO_SCSI_EVT_RESET_REMOVED
);
934 virtio_scsi_release(s
);
937 aio_disable_external(ctx
);
938 qdev_simple_device_unplug_cb(hotplug_dev
, dev
, errp
);
939 aio_enable_external(ctx
);
942 virtio_scsi_acquire(s
);
943 /* If other users keep the BlockBackend in the iothread, that's ok */
944 blk_set_aio_context(sd
->conf
.blk
, qemu_get_aio_context(), NULL
);
945 virtio_scsi_release(s
);
949 static struct SCSIBusInfo virtio_scsi_scsi_info
= {
951 .max_channel
= VIRTIO_SCSI_MAX_CHANNEL
,
952 .max_target
= VIRTIO_SCSI_MAX_TARGET
,
953 .max_lun
= VIRTIO_SCSI_MAX_LUN
,
955 .complete
= virtio_scsi_command_complete
,
956 .fail
= virtio_scsi_command_failed
,
957 .cancel
= virtio_scsi_request_cancelled
,
958 .change
= virtio_scsi_change
,
959 .parse_cdb
= virtio_scsi_parse_cdb
,
960 .get_sg_list
= virtio_scsi_get_sg_list
,
961 .save_request
= virtio_scsi_save_request
,
962 .load_request
= virtio_scsi_load_request
,
965 void virtio_scsi_common_realize(DeviceState
*dev
,
966 VirtIOHandleOutput ctrl
,
967 VirtIOHandleOutput evt
,
968 VirtIOHandleOutput cmd
,
971 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
972 VirtIOSCSICommon
*s
= VIRTIO_SCSI_COMMON(dev
);
975 virtio_init(vdev
, "virtio-scsi", VIRTIO_ID_SCSI
,
976 sizeof(VirtIOSCSIConfig
));
978 if (s
->conf
.num_queues
== VIRTIO_SCSI_AUTO_NUM_QUEUES
) {
979 s
->conf
.num_queues
= 1;
981 if (s
->conf
.num_queues
== 0 ||
982 s
->conf
.num_queues
> VIRTIO_QUEUE_MAX
- VIRTIO_SCSI_VQ_NUM_FIXED
) {
983 error_setg(errp
, "Invalid number of queues (= %" PRIu32
"), "
984 "must be a positive integer less than %d.",
986 VIRTIO_QUEUE_MAX
- VIRTIO_SCSI_VQ_NUM_FIXED
);
987 virtio_cleanup(vdev
);
990 if (s
->conf
.virtqueue_size
<= 2) {
991 error_setg(errp
, "invalid virtqueue_size property (= %" PRIu32
"), "
992 "must be > 2", s
->conf
.virtqueue_size
);
995 s
->cmd_vqs
= g_new0(VirtQueue
*, s
->conf
.num_queues
);
996 s
->sense_size
= VIRTIO_SCSI_SENSE_DEFAULT_SIZE
;
997 s
->cdb_size
= VIRTIO_SCSI_CDB_DEFAULT_SIZE
;
999 s
->ctrl_vq
= virtio_add_queue(vdev
, s
->conf
.virtqueue_size
, ctrl
);
1000 s
->event_vq
= virtio_add_queue(vdev
, s
->conf
.virtqueue_size
, evt
);
1001 for (i
= 0; i
< s
->conf
.num_queues
; i
++) {
1002 s
->cmd_vqs
[i
] = virtio_add_queue(vdev
, s
->conf
.virtqueue_size
, cmd
);
1006 static void virtio_scsi_device_realize(DeviceState
*dev
, Error
**errp
)
1008 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1009 VirtIOSCSI
*s
= VIRTIO_SCSI(dev
);
1012 virtio_scsi_common_realize(dev
,
1013 virtio_scsi_handle_ctrl
,
1014 virtio_scsi_handle_event
,
1015 virtio_scsi_handle_cmd
,
1018 error_propagate(errp
, err
);
1022 scsi_bus_init_named(&s
->bus
, sizeof(s
->bus
), dev
,
1023 &virtio_scsi_scsi_info
, vdev
->bus_name
);
1024 /* override default SCSI bus hotplug-handler, with virtio-scsi's one */
1025 qbus_set_hotplug_handler(BUS(&s
->bus
), OBJECT(dev
));
1027 virtio_scsi_dataplane_setup(s
, errp
);
1030 void virtio_scsi_common_unrealize(DeviceState
*dev
)
1032 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1033 VirtIOSCSICommon
*vs
= VIRTIO_SCSI_COMMON(dev
);
1036 virtio_delete_queue(vs
->ctrl_vq
);
1037 virtio_delete_queue(vs
->event_vq
);
1038 for (i
= 0; i
< vs
->conf
.num_queues
; i
++) {
1039 virtio_delete_queue(vs
->cmd_vqs
[i
]);
1041 g_free(vs
->cmd_vqs
);
1042 virtio_cleanup(vdev
);
1045 static void virtio_scsi_device_unrealize(DeviceState
*dev
)
1047 VirtIOSCSI
*s
= VIRTIO_SCSI(dev
);
1049 qbus_set_hotplug_handler(BUS(&s
->bus
), NULL
);
1050 virtio_scsi_common_unrealize(dev
);
1053 static Property virtio_scsi_properties
[] = {
1054 DEFINE_PROP_UINT32("num_queues", VirtIOSCSI
, parent_obj
.conf
.num_queues
,
1055 VIRTIO_SCSI_AUTO_NUM_QUEUES
),
1056 DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSI
,
1057 parent_obj
.conf
.virtqueue_size
, 256),
1058 DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSI
,
1059 parent_obj
.conf
.seg_max_adjust
, true),
1060 DEFINE_PROP_UINT32("max_sectors", VirtIOSCSI
, parent_obj
.conf
.max_sectors
,
1062 DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSI
, parent_obj
.conf
.cmd_per_lun
,
1064 DEFINE_PROP_BIT("hotplug", VirtIOSCSI
, host_features
,
1065 VIRTIO_SCSI_F_HOTPLUG
, true),
1066 DEFINE_PROP_BIT("param_change", VirtIOSCSI
, host_features
,
1067 VIRTIO_SCSI_F_CHANGE
, true),
1068 DEFINE_PROP_LINK("iothread", VirtIOSCSI
, parent_obj
.conf
.iothread
,
1069 TYPE_IOTHREAD
, IOThread
*),
1070 DEFINE_PROP_END_OF_LIST(),
1073 static const VMStateDescription vmstate_virtio_scsi
= {
1074 .name
= "virtio-scsi",
1075 .minimum_version_id
= 1,
1077 .fields
= (VMStateField
[]) {
1078 VMSTATE_VIRTIO_DEVICE
,
1079 VMSTATE_END_OF_LIST()
1083 static void virtio_scsi_common_class_init(ObjectClass
*klass
, void *data
)
1085 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
1086 DeviceClass
*dc
= DEVICE_CLASS(klass
);
1088 vdc
->get_config
= virtio_scsi_get_config
;
1089 set_bit(DEVICE_CATEGORY_STORAGE
, dc
->categories
);
1092 static void virtio_scsi_class_init(ObjectClass
*klass
, void *data
)
1094 DeviceClass
*dc
= DEVICE_CLASS(klass
);
1095 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
1096 HotplugHandlerClass
*hc
= HOTPLUG_HANDLER_CLASS(klass
);
1098 device_class_set_props(dc
, virtio_scsi_properties
);
1099 dc
->vmsd
= &vmstate_virtio_scsi
;
1100 set_bit(DEVICE_CATEGORY_STORAGE
, dc
->categories
);
1101 vdc
->realize
= virtio_scsi_device_realize
;
1102 vdc
->unrealize
= virtio_scsi_device_unrealize
;
1103 vdc
->set_config
= virtio_scsi_set_config
;
1104 vdc
->get_features
= virtio_scsi_get_features
;
1105 vdc
->reset
= virtio_scsi_reset
;
1106 vdc
->start_ioeventfd
= virtio_scsi_dataplane_start
;
1107 vdc
->stop_ioeventfd
= virtio_scsi_dataplane_stop
;
1108 hc
->pre_plug
= virtio_scsi_pre_hotplug
;
1109 hc
->plug
= virtio_scsi_hotplug
;
1110 hc
->unplug
= virtio_scsi_hotunplug
;
1113 static const TypeInfo virtio_scsi_common_info
= {
1114 .name
= TYPE_VIRTIO_SCSI_COMMON
,
1115 .parent
= TYPE_VIRTIO_DEVICE
,
1116 .instance_size
= sizeof(VirtIOSCSICommon
),
1118 .class_init
= virtio_scsi_common_class_init
,
1121 static const TypeInfo virtio_scsi_info
= {
1122 .name
= TYPE_VIRTIO_SCSI
,
1123 .parent
= TYPE_VIRTIO_SCSI_COMMON
,
1124 .instance_size
= sizeof(VirtIOSCSI
),
1125 .class_init
= virtio_scsi_class_init
,
1126 .interfaces
= (InterfaceInfo
[]) {
1127 { TYPE_HOTPLUG_HANDLER
},
1132 static void virtio_register_types(void)
1134 type_register_static(&virtio_scsi_common_info
);
1135 type_register_static(&virtio_scsi_info
);
1138 type_init(virtio_register_types
)