The VirtQueueElement is a very big structure (>48k!), since it will be initialzed by virtqueue_pop, we can save the expensive zeroing here. This saves a few microseconds per request in my test: [fio-test] rw bs iodepth jobs bw iops latency -------------------------------------------------------------------------------------------- Before read 4k 1 1 110 28269 34 After read 4k 1 1 131 33745 28 Whereas, virtio-blk read 4k 1 1 217 55673 16 Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
830 lines
25 KiB
C
830 lines
25 KiB
C
/*
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* Virtio SCSI HBA
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*
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* Copyright IBM, Corp. 2010
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* Copyright Red Hat, Inc. 2011
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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* Paolo Bonzini <pbonzini@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "hw/virtio/virtio-scsi.h"
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#include "qemu/error-report.h"
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#include "qemu/iov.h"
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#include <hw/scsi/scsi.h>
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#include <block/scsi.h>
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#include <hw/virtio/virtio-bus.h>
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#include "hw/virtio/virtio-access.h"
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typedef struct VirtIOSCSIReq {
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VirtIOSCSI *dev;
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VirtQueue *vq;
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QEMUSGList qsgl;
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QEMUIOVector resp_iov;
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/* Note:
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* - fields before elem are initialized by virtio_scsi_init_req;
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* - elem is uninitialized at the time of allocation.
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* - fields after elem are zeroed by virtio_scsi_init_req.
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* */
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VirtQueueElement elem;
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SCSIRequest *sreq;
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size_t resp_size;
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enum SCSIXferMode mode;
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union {
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VirtIOSCSICmdResp cmd;
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VirtIOSCSICtrlTMFResp tmf;
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VirtIOSCSICtrlANResp an;
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VirtIOSCSIEvent event;
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} resp;
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union {
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struct {
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VirtIOSCSICmdReq cmd;
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uint8_t cdb[];
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} QEMU_PACKED;
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VirtIOSCSICtrlTMFReq tmf;
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VirtIOSCSICtrlANReq an;
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} req;
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} VirtIOSCSIReq;
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QEMU_BUILD_BUG_ON(offsetof(VirtIOSCSIReq, req.cdb) !=
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offsetof(VirtIOSCSIReq, req.cmd) + sizeof(VirtIOSCSICmdReq));
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static inline int virtio_scsi_get_lun(uint8_t *lun)
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{
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return ((lun[2] << 8) | lun[3]) & 0x3FFF;
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}
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static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun)
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{
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if (lun[0] != 1) {
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return NULL;
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}
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if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
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return NULL;
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}
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return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
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}
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static VirtIOSCSIReq *virtio_scsi_init_req(VirtIOSCSI *s, VirtQueue *vq)
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{
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VirtIOSCSIReq *req;
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VirtIOSCSICommon *vs = (VirtIOSCSICommon *)s;
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const size_t zero_skip = offsetof(VirtIOSCSIReq, elem)
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+ sizeof(VirtQueueElement);
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req = g_slice_alloc(sizeof(*req) + vs->cdb_size);
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req->vq = vq;
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req->dev = s;
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qemu_sglist_init(&req->qsgl, DEVICE(s), 8, &address_space_memory);
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qemu_iovec_init(&req->resp_iov, 1);
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memset((uint8_t *)req + zero_skip, 0, sizeof(*req) - zero_skip);
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return req;
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}
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static void virtio_scsi_free_req(VirtIOSCSIReq *req)
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{
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VirtIOSCSICommon *vs = (VirtIOSCSICommon *)req->dev;
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qemu_iovec_destroy(&req->resp_iov);
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qemu_sglist_destroy(&req->qsgl);
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g_slice_free1(sizeof(*req) + vs->cdb_size, req);
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}
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static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
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{
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VirtIOSCSI *s = req->dev;
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VirtQueue *vq = req->vq;
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VirtIODevice *vdev = VIRTIO_DEVICE(s);
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qemu_iovec_from_buf(&req->resp_iov, 0, &req->resp, req->resp_size);
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virtqueue_push(vq, &req->elem, req->qsgl.size + req->resp_iov.size);
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if (req->sreq) {
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req->sreq->hba_private = NULL;
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scsi_req_unref(req->sreq);
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}
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virtio_scsi_free_req(req);
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virtio_notify(vdev, vq);
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}
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static void virtio_scsi_bad_req(void)
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{
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error_report("wrong size for virtio-scsi headers");
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exit(1);
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}
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static size_t qemu_sgl_concat(VirtIOSCSIReq *req, struct iovec *iov,
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hwaddr *addr, int num, size_t skip)
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{
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QEMUSGList *qsgl = &req->qsgl;
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size_t copied = 0;
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while (num) {
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if (skip >= iov->iov_len) {
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skip -= iov->iov_len;
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} else {
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qemu_sglist_add(qsgl, *addr + skip, iov->iov_len - skip);
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copied += iov->iov_len - skip;
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skip = 0;
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}
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iov++;
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addr++;
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num--;
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}
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assert(skip == 0);
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return copied;
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}
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static int virtio_scsi_parse_req(VirtIOSCSIReq *req,
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unsigned req_size, unsigned resp_size)
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{
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size_t in_size, out_size;
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if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
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&req->req, req_size) < req_size) {
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return -EINVAL;
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}
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if (qemu_iovec_concat_iov(&req->resp_iov,
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req->elem.in_sg, req->elem.in_num, 0,
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resp_size) < resp_size) {
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return -EINVAL;
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}
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req->resp_size = resp_size;
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out_size = qemu_sgl_concat(req, req->elem.out_sg,
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&req->elem.out_addr[0], req->elem.out_num,
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req_size);
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in_size = qemu_sgl_concat(req, req->elem.in_sg,
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&req->elem.in_addr[0], req->elem.in_num,
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resp_size);
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if (out_size && in_size) {
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return -ENOTSUP;
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}
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if (out_size) {
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req->mode = SCSI_XFER_TO_DEV;
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} else if (in_size) {
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req->mode = SCSI_XFER_FROM_DEV;
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}
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return 0;
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}
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static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
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{
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VirtIOSCSIReq *req = virtio_scsi_init_req(s, vq);
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if (!virtqueue_pop(vq, &req->elem)) {
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virtio_scsi_free_req(req);
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return NULL;
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}
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return req;
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}
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static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
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{
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VirtIOSCSIReq *req = sreq->hba_private;
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(req->dev);
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uint32_t n = virtio_queue_get_id(req->vq) - 2;
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assert(n < vs->conf.num_queues);
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qemu_put_be32s(f, &n);
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qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
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}
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static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
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{
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SCSIBus *bus = sreq->bus;
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VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
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VirtIOSCSIReq *req;
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uint32_t n;
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qemu_get_be32s(f, &n);
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assert(n < vs->conf.num_queues);
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req = virtio_scsi_init_req(s, vs->cmd_vqs[n]);
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qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
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/* TODO: add a way for SCSIBusInfo's load_request to fail,
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* and fail migration instead of asserting here.
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* When we do, we might be able to re-enable NDEBUG below.
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*/
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#ifdef NDEBUG
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#error building with NDEBUG is not supported
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#endif
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assert(req->elem.in_num <= ARRAY_SIZE(req->elem.in_sg));
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assert(req->elem.out_num <= ARRAY_SIZE(req->elem.out_sg));
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if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
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sizeof(VirtIOSCSICmdResp) + vs->sense_size) < 0) {
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error_report("invalid SCSI request migration data");
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exit(1);
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}
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scsi_req_ref(sreq);
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req->sreq = sreq;
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if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
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assert(req->sreq->cmd.mode == req->mode);
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}
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return req;
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}
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static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
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{
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SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf.lun);
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SCSIRequest *r, *next;
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BusChild *kid;
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int target;
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/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
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req->resp.tmf.response = VIRTIO_SCSI_S_OK;
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virtio_tswap32s(VIRTIO_DEVICE(s), &req->req.tmf.subtype);
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switch (req->req.tmf.subtype) {
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case VIRTIO_SCSI_T_TMF_ABORT_TASK:
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case VIRTIO_SCSI_T_TMF_QUERY_TASK:
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if (!d) {
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goto fail;
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}
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if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
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goto incorrect_lun;
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}
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QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
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VirtIOSCSIReq *cmd_req = r->hba_private;
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if (cmd_req && cmd_req->req.cmd.tag == req->req.tmf.tag) {
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break;
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}
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}
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if (r) {
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/*
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* Assert that the request has not been completed yet, we
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* check for it in the loop above.
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*/
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assert(r->hba_private);
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if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
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/* "If the specified command is present in the task set, then
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* return a service response set to FUNCTION SUCCEEDED".
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*/
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req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
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} else {
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scsi_req_cancel(r);
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}
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}
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break;
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case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
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if (!d) {
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goto fail;
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}
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if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
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goto incorrect_lun;
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}
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s->resetting++;
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qdev_reset_all(&d->qdev);
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s->resetting--;
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break;
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case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
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case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
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case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
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if (!d) {
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goto fail;
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}
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if (d->lun != virtio_scsi_get_lun(req->req.tmf.lun)) {
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goto incorrect_lun;
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}
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QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
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if (r->hba_private) {
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if (req->req.tmf.subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
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/* "If there is any command present in the task set, then
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* return a service response set to FUNCTION SUCCEEDED".
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*/
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req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
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break;
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} else {
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scsi_req_cancel(r);
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}
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}
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}
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break;
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case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
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target = req->req.tmf.lun[1];
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s->resetting++;
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QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
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d = DO_UPCAST(SCSIDevice, qdev, kid->child);
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if (d->channel == 0 && d->id == target) {
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qdev_reset_all(&d->qdev);
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}
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}
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s->resetting--;
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break;
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case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
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default:
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req->resp.tmf.response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
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break;
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}
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return;
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incorrect_lun:
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req->resp.tmf.response = VIRTIO_SCSI_S_INCORRECT_LUN;
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return;
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fail:
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req->resp.tmf.response = VIRTIO_SCSI_S_BAD_TARGET;
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}
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static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIOSCSI *s = (VirtIOSCSI *)vdev;
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VirtIOSCSIReq *req;
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while ((req = virtio_scsi_pop_req(s, vq))) {
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int type;
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if (iov_to_buf(req->elem.out_sg, req->elem.out_num, 0,
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&type, sizeof(type)) < sizeof(type)) {
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virtio_scsi_bad_req();
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continue;
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}
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virtio_tswap32s(vdev, &req->req.tmf.type);
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if (req->req.tmf.type == VIRTIO_SCSI_T_TMF) {
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if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlTMFReq),
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sizeof(VirtIOSCSICtrlTMFResp)) < 0) {
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virtio_scsi_bad_req();
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} else {
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virtio_scsi_do_tmf(s, req);
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}
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} else if (req->req.tmf.type == VIRTIO_SCSI_T_AN_QUERY ||
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req->req.tmf.type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
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if (virtio_scsi_parse_req(req, sizeof(VirtIOSCSICtrlANReq),
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sizeof(VirtIOSCSICtrlANResp)) < 0) {
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virtio_scsi_bad_req();
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} else {
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req->resp.an.event_actual = 0;
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req->resp.an.response = VIRTIO_SCSI_S_OK;
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}
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}
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virtio_scsi_complete_req(req);
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}
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}
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static void virtio_scsi_complete_cmd_req(VirtIOSCSIReq *req)
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{
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/* Sense data is not in req->resp and is copied separately
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* in virtio_scsi_command_complete.
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*/
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req->resp_size = sizeof(VirtIOSCSICmdResp);
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virtio_scsi_complete_req(req);
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}
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static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
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size_t resid)
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{
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VirtIOSCSIReq *req = r->hba_private;
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uint8_t sense[SCSI_SENSE_BUF_SIZE];
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uint32_t sense_len;
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VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
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if (r->io_canceled) {
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return;
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}
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req->resp.cmd.response = VIRTIO_SCSI_S_OK;
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req->resp.cmd.status = status;
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if (req->resp.cmd.status == GOOD) {
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req->resp.cmd.resid = virtio_tswap32(vdev, resid);
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} else {
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req->resp.cmd.resid = 0;
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sense_len = scsi_req_get_sense(r, sense, sizeof(sense));
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sense_len = MIN(sense_len, req->resp_iov.size - sizeof(req->resp.cmd));
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qemu_iovec_from_buf(&req->resp_iov, sizeof(req->resp.cmd),
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&req->resp, sense_len);
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req->resp.cmd.sense_len = virtio_tswap32(vdev, sense_len);
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}
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virtio_scsi_complete_cmd_req(req);
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}
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static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
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uint8_t *buf, void *hba_private)
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{
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VirtIOSCSIReq *req = hba_private;
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if (cmd->len == 0) {
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cmd->len = MIN(VIRTIO_SCSI_CDB_SIZE, SCSI_CMD_BUF_SIZE);
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memcpy(cmd->buf, buf, cmd->len);
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}
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/* Extract the direction and mode directly from the request, for
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* host device passthrough.
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*/
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cmd->xfer = req->qsgl.size;
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if (cmd->xfer == 0) {
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cmd->mode = SCSI_XFER_NONE;
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} else if (iov_size(req->elem.in_sg, req->elem.in_num) > req->resp_size) {
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cmd->mode = SCSI_XFER_FROM_DEV;
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} else {
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cmd->mode = SCSI_XFER_TO_DEV;
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}
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return 0;
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}
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static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
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{
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VirtIOSCSIReq *req = r->hba_private;
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return &req->qsgl;
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}
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static void virtio_scsi_request_cancelled(SCSIRequest *r)
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{
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VirtIOSCSIReq *req = r->hba_private;
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if (!req) {
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return;
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}
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if (req->dev->resetting) {
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req->resp.cmd.response = VIRTIO_SCSI_S_RESET;
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} else {
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_ABORTED;
|
|
}
|
|
virtio_scsi_complete_cmd_req(req);
|
|
}
|
|
|
|
static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
|
|
{
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_FAILURE;
|
|
virtio_scsi_complete_cmd_req(req);
|
|
}
|
|
|
|
static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
/* use non-QOM casts in the data path */
|
|
VirtIOSCSI *s = (VirtIOSCSI *)vdev;
|
|
VirtIOSCSICommon *vs = &s->parent_obj;
|
|
|
|
VirtIOSCSIReq *req;
|
|
int n;
|
|
|
|
while ((req = virtio_scsi_pop_req(s, vq))) {
|
|
SCSIDevice *d;
|
|
int rc;
|
|
|
|
rc = virtio_scsi_parse_req(req, sizeof(VirtIOSCSICmdReq) + vs->cdb_size,
|
|
sizeof(VirtIOSCSICmdResp) + vs->sense_size);
|
|
if (rc < 0) {
|
|
if (rc == -ENOTSUP) {
|
|
virtio_scsi_fail_cmd_req(req);
|
|
} else {
|
|
virtio_scsi_bad_req();
|
|
}
|
|
continue;
|
|
}
|
|
|
|
d = virtio_scsi_device_find(s, req->req.cmd.lun);
|
|
if (!d) {
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
|
|
virtio_scsi_complete_cmd_req(req);
|
|
continue;
|
|
}
|
|
req->sreq = scsi_req_new(d, req->req.cmd.tag,
|
|
virtio_scsi_get_lun(req->req.cmd.lun),
|
|
req->req.cdb, req);
|
|
|
|
if (req->sreq->cmd.mode != SCSI_XFER_NONE
|
|
&& (req->sreq->cmd.mode != req->mode ||
|
|
req->sreq->cmd.xfer > req->qsgl.size)) {
|
|
req->resp.cmd.response = VIRTIO_SCSI_S_OVERRUN;
|
|
virtio_scsi_complete_cmd_req(req);
|
|
continue;
|
|
}
|
|
|
|
n = scsi_req_enqueue(req->sreq);
|
|
if (n) {
|
|
scsi_req_continue(req->sreq);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_get_config(VirtIODevice *vdev,
|
|
uint8_t *config)
|
|
{
|
|
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
|
|
VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(vdev);
|
|
|
|
virtio_stl_p(vdev, &scsiconf->num_queues, s->conf.num_queues);
|
|
virtio_stl_p(vdev, &scsiconf->seg_max, 128 - 2);
|
|
virtio_stl_p(vdev, &scsiconf->max_sectors, s->conf.max_sectors);
|
|
virtio_stl_p(vdev, &scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
|
|
virtio_stl_p(vdev, &scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
|
|
virtio_stl_p(vdev, &scsiconf->sense_size, s->sense_size);
|
|
virtio_stl_p(vdev, &scsiconf->cdb_size, s->cdb_size);
|
|
virtio_stw_p(vdev, &scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
|
|
virtio_stw_p(vdev, &scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
|
|
virtio_stl_p(vdev, &scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
|
|
}
|
|
|
|
static void virtio_scsi_set_config(VirtIODevice *vdev,
|
|
const uint8_t *config)
|
|
{
|
|
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
|
|
|
|
if ((uint32_t) virtio_ldl_p(vdev, &scsiconf->sense_size) >= 65536 ||
|
|
(uint32_t) virtio_ldl_p(vdev, &scsiconf->cdb_size) >= 256) {
|
|
error_report("bad data written to virtio-scsi configuration space");
|
|
exit(1);
|
|
}
|
|
|
|
vs->sense_size = virtio_ldl_p(vdev, &scsiconf->sense_size);
|
|
vs->cdb_size = virtio_ldl_p(vdev, &scsiconf->cdb_size);
|
|
}
|
|
|
|
static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
|
|
uint32_t requested_features)
|
|
{
|
|
return requested_features;
|
|
}
|
|
|
|
static void virtio_scsi_reset(VirtIODevice *vdev)
|
|
{
|
|
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
|
|
|
|
s->resetting++;
|
|
qbus_reset_all(&s->bus.qbus);
|
|
s->resetting--;
|
|
|
|
vs->sense_size = VIRTIO_SCSI_SENSE_SIZE;
|
|
vs->cdb_size = VIRTIO_SCSI_CDB_SIZE;
|
|
s->events_dropped = false;
|
|
}
|
|
|
|
/* The device does not have anything to save beyond the virtio data.
|
|
* Request data is saved with callbacks from SCSI devices.
|
|
*/
|
|
static void virtio_scsi_save(QEMUFile *f, void *opaque)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
|
|
virtio_save(vdev, f);
|
|
}
|
|
|
|
static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
|
|
int ret;
|
|
|
|
ret = virtio_load(vdev, f, version_id);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
|
|
uint32_t event, uint32_t reason)
|
|
{
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
|
|
VirtIOSCSIReq *req;
|
|
VirtIOSCSIEvent *evt;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
return;
|
|
}
|
|
|
|
req = virtio_scsi_pop_req(s, vs->event_vq);
|
|
if (!req) {
|
|
s->events_dropped = true;
|
|
return;
|
|
}
|
|
|
|
if (s->events_dropped) {
|
|
event |= VIRTIO_SCSI_T_EVENTS_MISSED;
|
|
s->events_dropped = false;
|
|
}
|
|
|
|
if (virtio_scsi_parse_req(req, 0, sizeof(VirtIOSCSIEvent))) {
|
|
virtio_scsi_bad_req();
|
|
}
|
|
|
|
evt = &req->resp.event;
|
|
memset(evt, 0, sizeof(VirtIOSCSIEvent));
|
|
evt->event = virtio_tswap32(vdev, event);
|
|
evt->reason = virtio_tswap32(vdev, reason);
|
|
if (!dev) {
|
|
assert(event == VIRTIO_SCSI_T_EVENTS_MISSED);
|
|
} else {
|
|
evt->lun[0] = 1;
|
|
evt->lun[1] = dev->id;
|
|
|
|
/* Linux wants us to keep the same encoding we use for REPORT LUNS. */
|
|
if (dev->lun >= 256) {
|
|
evt->lun[2] = (dev->lun >> 8) | 0x40;
|
|
}
|
|
evt->lun[3] = dev->lun & 0xFF;
|
|
}
|
|
virtio_scsi_complete_req(req);
|
|
}
|
|
|
|
static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIOSCSI *s = VIRTIO_SCSI(vdev);
|
|
|
|
if (s->events_dropped) {
|
|
virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
|
|
{
|
|
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if (((vdev->guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) &&
|
|
dev->type != TYPE_ROM) {
|
|
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
|
|
sense.asc | (sense.ascq << 8));
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
|
|
{
|
|
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
|
|
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
|
|
VIRTIO_SCSI_EVT_RESET_RESCAN);
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
|
|
{
|
|
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
|
|
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
|
|
VIRTIO_SCSI_EVT_RESET_REMOVED);
|
|
}
|
|
}
|
|
|
|
static struct SCSIBusInfo virtio_scsi_scsi_info = {
|
|
.tcq = true,
|
|
.max_channel = VIRTIO_SCSI_MAX_CHANNEL,
|
|
.max_target = VIRTIO_SCSI_MAX_TARGET,
|
|
.max_lun = VIRTIO_SCSI_MAX_LUN,
|
|
|
|
.complete = virtio_scsi_command_complete,
|
|
.cancel = virtio_scsi_request_cancelled,
|
|
.change = virtio_scsi_change,
|
|
.hotplug = virtio_scsi_hotplug,
|
|
.hot_unplug = virtio_scsi_hot_unplug,
|
|
.parse_cdb = virtio_scsi_parse_cdb,
|
|
.get_sg_list = virtio_scsi_get_sg_list,
|
|
.save_request = virtio_scsi_save_request,
|
|
.load_request = virtio_scsi_load_request,
|
|
};
|
|
|
|
void virtio_scsi_common_realize(DeviceState *dev, Error **errp,
|
|
HandleOutput ctrl, HandleOutput evt,
|
|
HandleOutput cmd)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSCSICommon *s = VIRTIO_SCSI_COMMON(dev);
|
|
int i;
|
|
|
|
virtio_init(vdev, "virtio-scsi", VIRTIO_ID_SCSI,
|
|
sizeof(VirtIOSCSIConfig));
|
|
|
|
if (s->conf.num_queues <= 0 || s->conf.num_queues > VIRTIO_PCI_QUEUE_MAX) {
|
|
error_setg(errp, "Invalid number of queues (= %" PRId32 "), "
|
|
"must be a positive integer less than %d.",
|
|
s->conf.num_queues, VIRTIO_PCI_QUEUE_MAX);
|
|
return;
|
|
}
|
|
s->cmd_vqs = g_malloc0(s->conf.num_queues * sizeof(VirtQueue *));
|
|
s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
|
|
s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
|
|
|
|
s->ctrl_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
|
|
ctrl);
|
|
s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
|
|
evt);
|
|
for (i = 0; i < s->conf.num_queues; i++) {
|
|
s->cmd_vqs[i] = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
|
|
cmd);
|
|
}
|
|
}
|
|
|
|
static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSCSI *s = VIRTIO_SCSI(dev);
|
|
static int virtio_scsi_id;
|
|
Error *err = NULL;
|
|
|
|
virtio_scsi_common_realize(dev, &err, virtio_scsi_handle_ctrl,
|
|
virtio_scsi_handle_event,
|
|
virtio_scsi_handle_cmd);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
|
|
scsi_bus_new(&s->bus, sizeof(s->bus), dev,
|
|
&virtio_scsi_scsi_info, vdev->bus_name);
|
|
|
|
if (!dev->hotplugged) {
|
|
scsi_bus_legacy_handle_cmdline(&s->bus, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
|
|
virtio_scsi_save, virtio_scsi_load, s);
|
|
}
|
|
|
|
void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
|
|
|
|
g_free(vs->cmd_vqs);
|
|
virtio_cleanup(vdev);
|
|
}
|
|
|
|
static void virtio_scsi_device_unrealize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIOSCSI *s = VIRTIO_SCSI(dev);
|
|
|
|
unregister_savevm(dev, "virtio-scsi", s);
|
|
|
|
virtio_scsi_common_unrealize(dev, errp);
|
|
}
|
|
|
|
static Property virtio_scsi_properties[] = {
|
|
DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSI, parent_obj.conf),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_scsi_common_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
vdc->get_config = virtio_scsi_get_config;
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
|
}
|
|
|
|
static void virtio_scsi_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
|
|
dc->props = virtio_scsi_properties;
|
|
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
|
|
vdc->realize = virtio_scsi_device_realize;
|
|
vdc->unrealize = virtio_scsi_device_unrealize;
|
|
vdc->set_config = virtio_scsi_set_config;
|
|
vdc->get_features = virtio_scsi_get_features;
|
|
vdc->reset = virtio_scsi_reset;
|
|
}
|
|
|
|
static const TypeInfo virtio_scsi_common_info = {
|
|
.name = TYPE_VIRTIO_SCSI_COMMON,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VirtIOSCSICommon),
|
|
.abstract = true,
|
|
.class_init = virtio_scsi_common_class_init,
|
|
};
|
|
|
|
static const TypeInfo virtio_scsi_info = {
|
|
.name = TYPE_VIRTIO_SCSI,
|
|
.parent = TYPE_VIRTIO_SCSI_COMMON,
|
|
.instance_size = sizeof(VirtIOSCSI),
|
|
.class_init = virtio_scsi_class_init,
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_scsi_common_info);
|
|
type_register_static(&virtio_scsi_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|