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authorPaolo Bonzini <pbonzini@redhat.com>2013-02-05 12:42:31 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2013-04-08 18:13:12 +0200
commit6e7907468fd05b8a641a715ebb110fc1903a604e (patch)
tree5cf7b3f8245158c5287d93a831f8c3103db51c72 /hw/scsi/virtio-scsi.c
parent49ab747f668f421138d5b40d83fa279c4c5e278d (diff)
hw: move virtio devices to hw/ subdirectories
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/scsi/virtio-scsi.c')
-rw-r--r--hw/scsi/virtio-scsi.c774
1 files changed, 774 insertions, 0 deletions
diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
new file mode 100644
index 0000000000..ead7cda13d
--- /dev/null
+++ b/hw/scsi/virtio-scsi.c
@@ -0,0 +1,774 @@
+/*
+ * Virtio SCSI HBA
+ *
+ * Copyright IBM, Corp. 2010
+ * Copyright Red Hat, Inc. 2011
+ *
+ * Authors:
+ * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+ * Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "hw/virtio/virtio-scsi.h"
+#include "qemu/error-report.h"
+#include <hw/scsi/scsi.h>
+#include <block/scsi.h>
+#include <hw/virtio/virtio-bus.h>
+
+#define VIRTIO_SCSI_VQ_SIZE 128
+#define VIRTIO_SCSI_CDB_SIZE 32
+#define VIRTIO_SCSI_SENSE_SIZE 96
+#define VIRTIO_SCSI_MAX_CHANNEL 0
+#define VIRTIO_SCSI_MAX_TARGET 255
+#define VIRTIO_SCSI_MAX_LUN 16383
+
+/* Response codes */
+#define VIRTIO_SCSI_S_OK 0
+#define VIRTIO_SCSI_S_OVERRUN 1
+#define VIRTIO_SCSI_S_ABORTED 2
+#define VIRTIO_SCSI_S_BAD_TARGET 3
+#define VIRTIO_SCSI_S_RESET 4
+#define VIRTIO_SCSI_S_BUSY 5
+#define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6
+#define VIRTIO_SCSI_S_TARGET_FAILURE 7
+#define VIRTIO_SCSI_S_NEXUS_FAILURE 8
+#define VIRTIO_SCSI_S_FAILURE 9
+#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10
+#define VIRTIO_SCSI_S_FUNCTION_REJECTED 11
+#define VIRTIO_SCSI_S_INCORRECT_LUN 12
+
+/* Controlq type codes. */
+#define VIRTIO_SCSI_T_TMF 0
+#define VIRTIO_SCSI_T_AN_QUERY 1
+#define VIRTIO_SCSI_T_AN_SUBSCRIBE 2
+
+/* Valid TMF subtypes. */
+#define VIRTIO_SCSI_T_TMF_ABORT_TASK 0
+#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1
+#define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2
+#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3
+#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4
+#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5
+#define VIRTIO_SCSI_T_TMF_QUERY_TASK 6
+#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7
+
+/* Events. */
+#define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000
+#define VIRTIO_SCSI_T_NO_EVENT 0
+#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
+#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
+#define VIRTIO_SCSI_T_PARAM_CHANGE 3
+
+/* Reasons for transport reset event */
+#define VIRTIO_SCSI_EVT_RESET_HARD 0
+#define VIRTIO_SCSI_EVT_RESET_RESCAN 1
+#define VIRTIO_SCSI_EVT_RESET_REMOVED 2
+
+/* SCSI command request, followed by data-out */
+typedef struct {
+ uint8_t lun[8]; /* Logical Unit Number */
+ uint64_t tag; /* Command identifier */
+ uint8_t task_attr; /* Task attribute */
+ uint8_t prio;
+ uint8_t crn;
+ uint8_t cdb[];
+} QEMU_PACKED VirtIOSCSICmdReq;
+
+/* Response, followed by sense data and data-in */
+typedef struct {
+ uint32_t sense_len; /* Sense data length */
+ uint32_t resid; /* Residual bytes in data buffer */
+ uint16_t status_qualifier; /* Status qualifier */
+ uint8_t status; /* Command completion status */
+ uint8_t response; /* Response values */
+ uint8_t sense[];
+} QEMU_PACKED VirtIOSCSICmdResp;
+
+/* Task Management Request */
+typedef struct {
+ uint32_t type;
+ uint32_t subtype;
+ uint8_t lun[8];
+ uint64_t tag;
+} QEMU_PACKED VirtIOSCSICtrlTMFReq;
+
+typedef struct {
+ uint8_t response;
+} QEMU_PACKED VirtIOSCSICtrlTMFResp;
+
+/* Asynchronous notification query/subscription */
+typedef struct {
+ uint32_t type;
+ uint8_t lun[8];
+ uint32_t event_requested;
+} QEMU_PACKED VirtIOSCSICtrlANReq;
+
+typedef struct {
+ uint32_t event_actual;
+ uint8_t response;
+} QEMU_PACKED VirtIOSCSICtrlANResp;
+
+typedef struct {
+ uint32_t event;
+ uint8_t lun[8];
+ uint32_t reason;
+} QEMU_PACKED VirtIOSCSIEvent;
+
+typedef struct {
+ uint32_t num_queues;
+ uint32_t seg_max;
+ uint32_t max_sectors;
+ uint32_t cmd_per_lun;
+ uint32_t event_info_size;
+ uint32_t sense_size;
+ uint32_t cdb_size;
+ uint16_t max_channel;
+ uint16_t max_target;
+ uint32_t max_lun;
+} QEMU_PACKED VirtIOSCSIConfig;
+
+typedef struct VirtIOSCSIReq {
+ VirtIOSCSI *dev;
+ VirtQueue *vq;
+ VirtQueueElement elem;
+ QEMUSGList qsgl;
+ SCSIRequest *sreq;
+ union {
+ char *buf;
+ VirtIOSCSICmdReq *cmd;
+ VirtIOSCSICtrlTMFReq *tmf;
+ VirtIOSCSICtrlANReq *an;
+ } req;
+ union {
+ char *buf;
+ VirtIOSCSICmdResp *cmd;
+ VirtIOSCSICtrlTMFResp *tmf;
+ VirtIOSCSICtrlANResp *an;
+ VirtIOSCSIEvent *event;
+ } resp;
+} VirtIOSCSIReq;
+
+static inline int virtio_scsi_get_lun(uint8_t *lun)
+{
+ return ((lun[2] << 8) | lun[3]) & 0x3FFF;
+}
+
+static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun)
+{
+ if (lun[0] != 1) {
+ return NULL;
+ }
+ if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
+ return NULL;
+ }
+ return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
+}
+
+static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
+{
+ VirtIOSCSI *s = req->dev;
+ VirtQueue *vq = req->vq;
+ VirtIODevice *vdev = VIRTIO_DEVICE(s);
+ virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
+ qemu_sglist_destroy(&req->qsgl);
+ if (req->sreq) {
+ req->sreq->hba_private = NULL;
+ scsi_req_unref(req->sreq);
+ }
+ g_free(req);
+ virtio_notify(vdev, vq);
+}
+
+static void virtio_scsi_bad_req(void)
+{
+ error_report("wrong size for virtio-scsi headers");
+ exit(1);
+}
+
+static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg,
+ hwaddr *addr, int num)
+{
+ qemu_sglist_init(qsgl, num, &dma_context_memory);
+ while (num--) {
+ qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
+ }
+}
+
+static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq,
+ VirtIOSCSIReq *req)
+{
+ assert(req->elem.in_num);
+ req->vq = vq;
+ req->dev = s;
+ req->sreq = NULL;
+ if (req->elem.out_num) {
+ req->req.buf = req->elem.out_sg[0].iov_base;
+ }
+ req->resp.buf = req->elem.in_sg[0].iov_base;
+
+ if (req->elem.out_num > 1) {
+ qemu_sgl_init_external(&req->qsgl, &req->elem.out_sg[1],
+ &req->elem.out_addr[1],
+ req->elem.out_num - 1);
+ } else {
+ qemu_sgl_init_external(&req->qsgl, &req->elem.in_sg[1],
+ &req->elem.in_addr[1],
+ req->elem.in_num - 1);
+ }
+}
+
+static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
+{
+ VirtIOSCSIReq *req;
+ req = g_malloc(sizeof(*req));
+ if (!virtqueue_pop(vq, &req->elem)) {
+ g_free(req);
+ return NULL;
+ }
+
+ virtio_scsi_parse_req(s, vq, req);
+ return req;
+}
+
+static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq)
+{
+ VirtIOSCSIReq *req = sreq->hba_private;
+ uint32_t n = virtio_queue_get_id(req->vq) - 2;
+
+ assert(n < req->dev->conf.num_queues);
+ qemu_put_be32s(f, &n);
+ qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
+}
+
+static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq)
+{
+ SCSIBus *bus = sreq->bus;
+ VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+ VirtIOSCSIReq *req;
+ uint32_t n;
+
+ req = g_malloc(sizeof(*req));
+ qemu_get_be32s(f, &n);
+ assert(n < s->conf.num_queues);
+ qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
+ virtio_scsi_parse_req(s, s->cmd_vqs[n], req);
+
+ scsi_req_ref(sreq);
+ req->sreq = sreq;
+ if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
+ int req_mode =
+ (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
+
+ assert(req->sreq->cmd.mode == req_mode);
+ }
+ return req;
+}
+
+static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
+{
+ SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun);
+ SCSIRequest *r, *next;
+ BusChild *kid;
+ int target;
+
+ /* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
+ req->resp.tmf->response = VIRTIO_SCSI_S_OK;
+
+ switch (req->req.tmf->subtype) {
+ case VIRTIO_SCSI_T_TMF_ABORT_TASK:
+ case VIRTIO_SCSI_T_TMF_QUERY_TASK:
+ if (!d) {
+ goto fail;
+ }
+ if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
+ goto incorrect_lun;
+ }
+ QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
+ VirtIOSCSIReq *cmd_req = r->hba_private;
+ if (cmd_req && cmd_req->req.cmd->tag == req->req.tmf->tag) {
+ break;
+ }
+ }
+ if (r) {
+ /*
+ * Assert that the request has not been completed yet, we
+ * check for it in the loop above.
+ */
+ assert(r->hba_private);
+ if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
+ /* "If the specified command is present in the task set, then
+ * return a service response set to FUNCTION SUCCEEDED".
+ */
+ req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
+ } else {
+ scsi_req_cancel(r);
+ }
+ }
+ break;
+
+ case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
+ if (!d) {
+ goto fail;
+ }
+ if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
+ goto incorrect_lun;
+ }
+ s->resetting++;
+ qdev_reset_all(&d->qdev);
+ s->resetting--;
+ break;
+
+ case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
+ case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
+ case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
+ if (!d) {
+ goto fail;
+ }
+ if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
+ goto incorrect_lun;
+ }
+ QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
+ if (r->hba_private) {
+ if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
+ /* "If there is any command present in the task set, then
+ * return a service response set to FUNCTION SUCCEEDED".
+ */
+ req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
+ break;
+ } else {
+ scsi_req_cancel(r);
+ }
+ }
+ }
+ break;
+
+ case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
+ target = req->req.tmf->lun[1];
+ s->resetting++;
+ QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
+ d = DO_UPCAST(SCSIDevice, qdev, kid->child);
+ if (d->channel == 0 && d->id == target) {
+ qdev_reset_all(&d->qdev);
+ }
+ }
+ s->resetting--;
+ break;
+
+ case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
+ default:
+ req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
+ break;
+ }
+
+ return;
+
+incorrect_lun:
+ req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN;
+ return;
+
+fail:
+ req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET;
+}
+
+static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIOSCSI *s = (VirtIOSCSI *)vdev;
+ VirtIOSCSIReq *req;
+
+ while ((req = virtio_scsi_pop_req(s, vq))) {
+ int out_size, in_size;
+ if (req->elem.out_num < 1 || req->elem.in_num < 1) {
+ virtio_scsi_bad_req();
+ continue;
+ }
+
+ out_size = req->elem.out_sg[0].iov_len;
+ in_size = req->elem.in_sg[0].iov_len;
+ if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
+ if (out_size < sizeof(VirtIOSCSICtrlTMFReq) ||
+ in_size < sizeof(VirtIOSCSICtrlTMFResp)) {
+ virtio_scsi_bad_req();
+ }
+ virtio_scsi_do_tmf(s, req);
+
+ } else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY ||
+ req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
+ if (out_size < sizeof(VirtIOSCSICtrlANReq) ||
+ in_size < sizeof(VirtIOSCSICtrlANResp)) {
+ virtio_scsi_bad_req();
+ }
+ req->resp.an->event_actual = 0;
+ req->resp.an->response = VIRTIO_SCSI_S_OK;
+ }
+ virtio_scsi_complete_req(req);
+ }
+}
+
+static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
+ size_t resid)
+{
+ VirtIOSCSIReq *req = r->hba_private;
+ uint32_t sense_len;
+
+ req->resp.cmd->response = VIRTIO_SCSI_S_OK;
+ req->resp.cmd->status = status;
+ if (req->resp.cmd->status == GOOD) {
+ req->resp.cmd->resid = tswap32(resid);
+ } else {
+ req->resp.cmd->resid = 0;
+ sense_len = scsi_req_get_sense(r, req->resp.cmd->sense,
+ VIRTIO_SCSI_SENSE_SIZE);
+ req->resp.cmd->sense_len = tswap32(sense_len);
+ }
+ virtio_scsi_complete_req(req);
+}
+
+static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
+{
+ VirtIOSCSIReq *req = r->hba_private;
+
+ return &req->qsgl;
+}
+
+static void virtio_scsi_request_cancelled(SCSIRequest *r)
+{
+ VirtIOSCSIReq *req = r->hba_private;
+
+ if (!req) {
+ return;
+ }
+ if (req->dev->resetting) {
+ req->resp.cmd->response = VIRTIO_SCSI_S_RESET;
+ } else {
+ req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED;
+ }
+ virtio_scsi_complete_req(req);
+}
+
+static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
+{
+ req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE;
+ virtio_scsi_complete_req(req);
+}
+
+static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIOSCSI *s = (VirtIOSCSI *)vdev;
+ VirtIOSCSIReq *req;
+ int n;
+
+ while ((req = virtio_scsi_pop_req(s, vq))) {
+ SCSIDevice *d;
+ int out_size, in_size;
+ if (req->elem.out_num < 1 || req->elem.in_num < 1) {
+ virtio_scsi_bad_req();
+ }
+
+ out_size = req->elem.out_sg[0].iov_len;
+ in_size = req->elem.in_sg[0].iov_len;
+ if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size ||
+ in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) {
+ virtio_scsi_bad_req();
+ }
+
+ if (req->elem.out_num > 1 && req->elem.in_num > 1) {
+ virtio_scsi_fail_cmd_req(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_req(req);
+ continue;
+ }
+ req->sreq = scsi_req_new(d, req->req.cmd->tag,
+ virtio_scsi_get_lun(req->req.cmd->lun),
+ req->req.cmd->cdb, req);
+
+ if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
+ int req_mode =
+ (req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
+
+ if (req->sreq->cmd.mode != req_mode ||
+ req->sreq->cmd.xfer > req->qsgl.size) {
+ req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN;
+ virtio_scsi_complete_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;
+ VirtIOSCSI *s = (VirtIOSCSI *)vdev;
+
+ stl_raw(&scsiconf->num_queues, s->conf.num_queues);
+ stl_raw(&scsiconf->seg_max, 128 - 2);
+ stl_raw(&scsiconf->max_sectors, s->conf.max_sectors);
+ stl_raw(&scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
+ stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
+ stl_raw(&scsiconf->sense_size, s->sense_size);
+ stl_raw(&scsiconf->cdb_size, s->cdb_size);
+ stw_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
+ stw_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
+ stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
+}
+
+static void virtio_scsi_set_config(VirtIODevice *vdev,
+ const uint8_t *config)
+{
+ VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
+ VirtIOSCSI *s = (VirtIOSCSI *)vdev;
+
+ if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 ||
+ (uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
+ error_report("bad data written to virtio-scsi configuration space");
+ exit(1);
+ }
+
+ s->sense_size = ldl_raw(&scsiconf->sense_size);
+ s->cdb_size = ldl_raw(&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 = (VirtIOSCSI *)vdev;
+
+ s->resetting++;
+ qbus_reset_all(&s->bus.qbus);
+ s->resetting--;
+
+ s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
+ s->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);
+ if (ret) {
+ return ret;
+ }
+ return 0;
+}
+
+static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev,
+ uint32_t event, uint32_t reason)
+{
+ VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq);
+ VirtIOSCSIEvent *evt;
+ VirtIODevice *vdev = VIRTIO_DEVICE(s);
+ int in_size;
+
+ if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ return;
+ }
+
+ if (!req) {
+ s->events_dropped = true;
+ return;
+ }
+
+ if (req->elem.out_num || req->elem.in_num != 1) {
+ virtio_scsi_bad_req();
+ }
+
+ if (s->events_dropped) {
+ event |= VIRTIO_SCSI_T_EVENTS_MISSED;
+ s->events_dropped = false;
+ }
+
+ in_size = req->elem.in_sg[0].iov_len;
+ if (in_size < sizeof(VirtIOSCSIEvent)) {
+ virtio_scsi_bad_req();
+ }
+
+ evt = req->resp.event;
+ memset(evt, 0, sizeof(VirtIOSCSIEvent));
+ evt->event = event;
+ evt->reason = reason;
+ if (!dev) {
+ assert(event == VIRTIO_SCSI_T_NO_EVENT);
+ } 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,
+ .get_sg_list = virtio_scsi_get_sg_list,
+ .save_request = virtio_scsi_save_request,
+ .load_request = virtio_scsi_load_request,
+};
+
+static int virtio_scsi_device_init(VirtIODevice *vdev)
+{
+ DeviceState *qdev = DEVICE(vdev);
+ VirtIOSCSI *s = VIRTIO_SCSI(vdev);
+ static int virtio_scsi_id;
+ int i;
+
+ virtio_init(VIRTIO_DEVICE(s), "virtio-scsi", VIRTIO_ID_SCSI,
+ sizeof(VirtIOSCSIConfig));
+
+ s->cmd_vqs = g_malloc0(s->conf.num_queues * sizeof(VirtQueue *));
+
+ /* TODO set up vdev function pointers */
+ vdev->get_config = virtio_scsi_get_config;
+ vdev->set_config = virtio_scsi_set_config;
+ vdev->get_features = virtio_scsi_get_features;
+ vdev->reset = virtio_scsi_reset;
+
+ s->ctrl_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
+ virtio_scsi_handle_ctrl);
+ s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
+ virtio_scsi_handle_event);
+ for (i = 0; i < s->conf.num_queues; i++) {
+ s->cmd_vqs[i] = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
+ virtio_scsi_handle_cmd);
+ }
+
+ scsi_bus_new(&s->bus, qdev, &virtio_scsi_scsi_info);
+ if (!qdev->hotplugged) {
+ scsi_bus_legacy_handle_cmdline(&s->bus);
+ }
+
+ register_savevm(qdev, "virtio-scsi", virtio_scsi_id++, 1,
+ virtio_scsi_save, virtio_scsi_load, s);
+
+ return 0;
+}
+
+static int virtio_scsi_device_exit(DeviceState *qdev)
+{
+ VirtIOSCSI *s = VIRTIO_SCSI(qdev);
+ VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
+
+ unregister_savevm(qdev, "virtio-scsi", s);
+ g_free(s->cmd_vqs);
+ virtio_common_cleanup(vdev);
+ return 0;
+}
+
+static Property virtio_scsi_properties[] = {
+ DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSI, conf),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtio_scsi_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+ dc->exit = virtio_scsi_device_exit;
+ dc->props = virtio_scsi_properties;
+ vdc->init = virtio_scsi_device_init;
+ vdc->get_config = virtio_scsi_get_config;
+ vdc->set_config = virtio_scsi_set_config;
+ vdc->get_features = virtio_scsi_get_features;
+ vdc->reset = virtio_scsi_reset;
+}
+
+static const TypeInfo virtio_scsi_info = {
+ .name = TYPE_VIRTIO_SCSI,
+ .parent = TYPE_VIRTIO_DEVICE,
+ .instance_size = sizeof(VirtIOSCSI),
+ .class_init = virtio_scsi_class_init,
+};
+
+static void virtio_register_types(void)
+{
+ type_register_static(&virtio_scsi_info);
+}
+
+type_init(virtio_register_types)