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| 1 |
/*
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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>
|
| 9 |
* 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 "virtio-scsi.h" |
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#include <hw/scsi.h> |
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#include <hw/scsi-defs.h> |
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|
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#define VIRTIO_SCSI_VQ_SIZE 128 |
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#define VIRTIO_SCSI_CDB_SIZE 32 |
| 22 |
#define VIRTIO_SCSI_SENSE_SIZE 96 |
| 23 |
#define VIRTIO_SCSI_MAX_CHANNEL 0 |
| 24 |
#define VIRTIO_SCSI_MAX_TARGET 255 |
| 25 |
#define VIRTIO_SCSI_MAX_LUN 16383 |
| 26 |
|
| 27 |
/* Feature Bits */
|
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#define VIRTIO_SCSI_F_INOUT 0 |
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#define VIRTIO_SCSI_F_HOTPLUG 1 |
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#define VIRTIO_SCSI_F_CHANGE 2 |
| 31 |
|
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/* Response codes */
|
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#define VIRTIO_SCSI_S_OK 0 |
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#define VIRTIO_SCSI_S_OVERRUN 1 |
| 35 |
#define VIRTIO_SCSI_S_ABORTED 2 |
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#define VIRTIO_SCSI_S_BAD_TARGET 3 |
| 37 |
#define VIRTIO_SCSI_S_RESET 4 |
| 38 |
#define VIRTIO_SCSI_S_BUSY 5 |
| 39 |
#define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6 |
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#define VIRTIO_SCSI_S_TARGET_FAILURE 7 |
| 41 |
#define VIRTIO_SCSI_S_NEXUS_FAILURE 8 |
| 42 |
#define VIRTIO_SCSI_S_FAILURE 9 |
| 43 |
#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10 |
| 44 |
#define VIRTIO_SCSI_S_FUNCTION_REJECTED 11 |
| 45 |
#define VIRTIO_SCSI_S_INCORRECT_LUN 12 |
| 46 |
|
| 47 |
/* Controlq type codes. */
|
| 48 |
#define VIRTIO_SCSI_T_TMF 0 |
| 49 |
#define VIRTIO_SCSI_T_AN_QUERY 1 |
| 50 |
#define VIRTIO_SCSI_T_AN_SUBSCRIBE 2 |
| 51 |
|
| 52 |
/* Valid TMF subtypes. */
|
| 53 |
#define VIRTIO_SCSI_T_TMF_ABORT_TASK 0 |
| 54 |
#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1 |
| 55 |
#define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2 |
| 56 |
#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3 |
| 57 |
#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4 |
| 58 |
#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5 |
| 59 |
#define VIRTIO_SCSI_T_TMF_QUERY_TASK 6 |
| 60 |
#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7 |
| 61 |
|
| 62 |
/* Events. */
|
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#define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000 |
| 64 |
#define VIRTIO_SCSI_T_NO_EVENT 0 |
| 65 |
#define VIRTIO_SCSI_T_TRANSPORT_RESET 1 |
| 66 |
#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2 |
| 67 |
#define VIRTIO_SCSI_T_PARAM_CHANGE 3 |
| 68 |
|
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/* Reasons for transport reset event */
|
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#define VIRTIO_SCSI_EVT_RESET_HARD 0 |
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#define VIRTIO_SCSI_EVT_RESET_RESCAN 1 |
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#define VIRTIO_SCSI_EVT_RESET_REMOVED 2 |
| 73 |
|
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/* SCSI command request, followed by data-out */
|
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typedef struct { |
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uint8_t lun[8]; /* Logical Unit Number */ |
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uint64_t tag; /* Command identifier */
|
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uint8_t task_attr; /* Task attribute */
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uint8_t prio; |
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uint8_t crn; |
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uint8_t cdb[]; |
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} QEMU_PACKED VirtIOSCSICmdReq; |
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|
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/* Response, followed by sense data and data-in */
|
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typedef struct { |
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uint32_t sense_len; /* Sense data length */
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uint32_t resid; /* Residual bytes in data buffer */
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uint16_t status_qualifier; /* Status qualifier */
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uint8_t status; /* Command completion status */
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uint8_t response; /* Response values */
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uint8_t sense[]; |
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} QEMU_PACKED VirtIOSCSICmdResp; |
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|
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/* Task Management Request */
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typedef struct { |
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uint32_t type; |
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uint32_t subtype; |
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uint8_t lun[8];
|
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uint64_t tag; |
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} QEMU_PACKED VirtIOSCSICtrlTMFReq; |
| 101 |
|
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typedef struct { |
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uint8_t response; |
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} QEMU_PACKED VirtIOSCSICtrlTMFResp; |
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|
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/* Asynchronous notification query/subscription */
|
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typedef struct { |
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uint32_t type; |
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uint8_t lun[8];
|
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uint32_t event_requested; |
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} QEMU_PACKED VirtIOSCSICtrlANReq; |
| 112 |
|
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typedef struct { |
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uint32_t event_actual; |
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uint8_t response; |
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} QEMU_PACKED VirtIOSCSICtrlANResp; |
| 117 |
|
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typedef struct { |
| 119 |
uint32_t event; |
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uint8_t lun[8];
|
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uint32_t reason; |
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} QEMU_PACKED VirtIOSCSIEvent; |
| 123 |
|
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typedef struct { |
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uint32_t num_queues; |
| 126 |
uint32_t seg_max; |
| 127 |
uint32_t max_sectors; |
| 128 |
uint32_t cmd_per_lun; |
| 129 |
uint32_t event_info_size; |
| 130 |
uint32_t sense_size; |
| 131 |
uint32_t cdb_size; |
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uint16_t max_channel; |
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uint16_t max_target; |
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uint32_t max_lun; |
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} QEMU_PACKED VirtIOSCSIConfig; |
| 136 |
|
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typedef struct { |
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VirtIODevice vdev; |
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DeviceState *qdev; |
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VirtIOSCSIConf *conf; |
| 141 |
|
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SCSIBus bus; |
| 143 |
uint32_t sense_size; |
| 144 |
uint32_t cdb_size; |
| 145 |
int resetting;
|
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bool events_dropped;
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VirtQueue *ctrl_vq; |
| 148 |
VirtQueue *event_vq; |
| 149 |
VirtQueue *cmd_vqs[0];
|
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} VirtIOSCSI; |
| 151 |
|
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typedef struct VirtIOSCSIReq { |
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VirtIOSCSI *dev; |
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VirtQueue *vq; |
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VirtQueueElement elem; |
| 156 |
QEMUSGList qsgl; |
| 157 |
SCSIRequest *sreq; |
| 158 |
union {
|
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char *buf;
|
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VirtIOSCSICmdReq *cmd; |
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VirtIOSCSICtrlTMFReq *tmf; |
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VirtIOSCSICtrlANReq *an; |
| 163 |
} req; |
| 164 |
union {
|
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char *buf;
|
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VirtIOSCSICmdResp *cmd; |
| 167 |
VirtIOSCSICtrlTMFResp *tmf; |
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VirtIOSCSICtrlANResp *an; |
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VirtIOSCSIEvent *event; |
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} resp; |
| 171 |
} VirtIOSCSIReq; |
| 172 |
|
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static inline int virtio_scsi_get_lun(uint8_t *lun) |
| 174 |
{
|
| 175 |
return ((lun[2] << 8) | lun[3]) & 0x3FFF; |
| 176 |
} |
| 177 |
|
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static inline SCSIDevice *virtio_scsi_device_find(VirtIOSCSI *s, uint8_t *lun) |
| 179 |
{
|
| 180 |
if (lun[0] != 1) { |
| 181 |
return NULL; |
| 182 |
} |
| 183 |
if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) { |
| 184 |
return NULL; |
| 185 |
} |
| 186 |
return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); |
| 187 |
} |
| 188 |
|
| 189 |
static void virtio_scsi_complete_req(VirtIOSCSIReq *req) |
| 190 |
{
|
| 191 |
VirtIOSCSI *s = req->dev; |
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VirtQueue *vq = req->vq; |
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virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
|
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qemu_sglist_destroy(&req->qsgl); |
| 195 |
if (req->sreq) {
|
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req->sreq->hba_private = NULL;
|
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scsi_req_unref(req->sreq); |
| 198 |
} |
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g_free(req); |
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virtio_notify(&s->vdev, vq); |
| 201 |
} |
| 202 |
|
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static void virtio_scsi_bad_req(void) |
| 204 |
{
|
| 205 |
error_report("wrong size for virtio-scsi headers");
|
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exit(1);
|
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} |
| 208 |
|
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static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg, |
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target_phys_addr_t *addr, int num)
|
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{
|
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memset(qsgl, 0, sizeof(*qsgl)); |
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while (num--) {
|
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qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len); |
| 215 |
} |
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} |
| 217 |
|
| 218 |
static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq, |
| 219 |
VirtIOSCSIReq *req) |
| 220 |
{
|
| 221 |
assert(req->elem.in_num); |
| 222 |
req->vq = vq; |
| 223 |
req->dev = s; |
| 224 |
req->sreq = NULL;
|
| 225 |
if (req->elem.out_num) {
|
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req->req.buf = req->elem.out_sg[0].iov_base;
|
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} |
| 228 |
req->resp.buf = req->elem.in_sg[0].iov_base;
|
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|
| 230 |
if (req->elem.out_num > 1) { |
| 231 |
qemu_sgl_init_external(&req->qsgl, &req->elem.out_sg[1],
|
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&req->elem.out_addr[1],
|
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req->elem.out_num - 1);
|
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} else {
|
| 235 |
qemu_sgl_init_external(&req->qsgl, &req->elem.in_sg[1],
|
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&req->elem.in_addr[1],
|
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req->elem.in_num - 1);
|
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} |
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} |
| 240 |
|
| 241 |
static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
|
| 242 |
{
|
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VirtIOSCSIReq *req; |
| 244 |
req = g_malloc(sizeof(*req));
|
| 245 |
if (!virtqueue_pop(vq, &req->elem)) {
|
| 246 |
g_free(req); |
| 247 |
return NULL; |
| 248 |
} |
| 249 |
|
| 250 |
virtio_scsi_parse_req(s, vq, req); |
| 251 |
return req;
|
| 252 |
} |
| 253 |
|
| 254 |
static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) |
| 255 |
{
|
| 256 |
VirtIOSCSIReq *req = sreq->hba_private; |
| 257 |
uint32_t n = virtio_queue_get_id(req->vq) - 2;
|
| 258 |
|
| 259 |
assert(n < req->dev->conf->num_queues); |
| 260 |
qemu_put_be32s(f, &n); |
| 261 |
qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); |
| 262 |
} |
| 263 |
|
| 264 |
static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) |
| 265 |
{
|
| 266 |
SCSIBus *bus = sreq->bus; |
| 267 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 268 |
VirtIOSCSIReq *req; |
| 269 |
uint32_t n; |
| 270 |
|
| 271 |
req = g_malloc(sizeof(*req));
|
| 272 |
qemu_get_be32s(f, &n); |
| 273 |
assert(n < s->conf->num_queues); |
| 274 |
qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); |
| 275 |
virtio_scsi_parse_req(s, s->cmd_vqs[n], req); |
| 276 |
|
| 277 |
scsi_req_ref(sreq); |
| 278 |
req->sreq = sreq; |
| 279 |
if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
|
| 280 |
int req_mode =
|
| 281 |
(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
|
| 282 |
|
| 283 |
assert(req->sreq->cmd.mode == req_mode); |
| 284 |
} |
| 285 |
return req;
|
| 286 |
} |
| 287 |
|
| 288 |
static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) |
| 289 |
{
|
| 290 |
SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun); |
| 291 |
SCSIRequest *r, *next; |
| 292 |
BusChild *kid; |
| 293 |
int target;
|
| 294 |
|
| 295 |
/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
|
| 296 |
req->resp.tmf->response = VIRTIO_SCSI_S_OK; |
| 297 |
|
| 298 |
switch (req->req.tmf->subtype) {
|
| 299 |
case VIRTIO_SCSI_T_TMF_ABORT_TASK:
|
| 300 |
case VIRTIO_SCSI_T_TMF_QUERY_TASK:
|
| 301 |
if (!d) {
|
| 302 |
goto fail;
|
| 303 |
} |
| 304 |
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
|
| 305 |
goto incorrect_lun;
|
| 306 |
} |
| 307 |
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
|
| 308 |
VirtIOSCSIReq *cmd_req = r->hba_private; |
| 309 |
if (cmd_req && cmd_req->req.cmd->tag == req->req.tmf->tag) {
|
| 310 |
break;
|
| 311 |
} |
| 312 |
} |
| 313 |
if (r) {
|
| 314 |
/*
|
| 315 |
* Assert that the request has not been completed yet, we
|
| 316 |
* check for it in the loop above.
|
| 317 |
*/
|
| 318 |
assert(r->hba_private); |
| 319 |
if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
|
| 320 |
/* "If the specified command is present in the task set, then
|
| 321 |
* return a service response set to FUNCTION SUCCEEDED".
|
| 322 |
*/
|
| 323 |
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
| 324 |
} else {
|
| 325 |
scsi_req_cancel(r); |
| 326 |
} |
| 327 |
} |
| 328 |
break;
|
| 329 |
|
| 330 |
case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
|
| 331 |
if (!d) {
|
| 332 |
goto fail;
|
| 333 |
} |
| 334 |
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
|
| 335 |
goto incorrect_lun;
|
| 336 |
} |
| 337 |
s->resetting++; |
| 338 |
qdev_reset_all(&d->qdev); |
| 339 |
s->resetting--; |
| 340 |
break;
|
| 341 |
|
| 342 |
case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
|
| 343 |
case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
|
| 344 |
case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
|
| 345 |
if (!d) {
|
| 346 |
goto fail;
|
| 347 |
} |
| 348 |
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
|
| 349 |
goto incorrect_lun;
|
| 350 |
} |
| 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".
|
| 356 |
*/
|
| 357 |
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
| 358 |
break;
|
| 359 |
} else {
|
| 360 |
scsi_req_cancel(r); |
| 361 |
} |
| 362 |
} |
| 363 |
} |
| 364 |
break;
|
| 365 |
|
| 366 |
case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
|
| 367 |
target = req->req.tmf->lun[1];
|
| 368 |
s->resetting++; |
| 369 |
QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
|
| 370 |
d = DO_UPCAST(SCSIDevice, qdev, kid->child); |
| 371 |
if (d->channel == 0 && d->id == target) { |
| 372 |
qdev_reset_all(&d->qdev); |
| 373 |
} |
| 374 |
} |
| 375 |
s->resetting--; |
| 376 |
break;
|
| 377 |
|
| 378 |
case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
|
| 379 |
default:
|
| 380 |
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED; |
| 381 |
break;
|
| 382 |
} |
| 383 |
|
| 384 |
return;
|
| 385 |
|
| 386 |
incorrect_lun:
|
| 387 |
req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN; |
| 388 |
return;
|
| 389 |
|
| 390 |
fail:
|
| 391 |
req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET; |
| 392 |
} |
| 393 |
|
| 394 |
static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
| 395 |
{
|
| 396 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 397 |
VirtIOSCSIReq *req; |
| 398 |
|
| 399 |
while ((req = virtio_scsi_pop_req(s, vq))) {
|
| 400 |
int out_size, in_size;
|
| 401 |
if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
| 402 |
virtio_scsi_bad_req(); |
| 403 |
continue;
|
| 404 |
} |
| 405 |
|
| 406 |
out_size = req->elem.out_sg[0].iov_len;
|
| 407 |
in_size = req->elem.in_sg[0].iov_len;
|
| 408 |
if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
|
| 409 |
if (out_size < sizeof(VirtIOSCSICtrlTMFReq) || |
| 410 |
in_size < sizeof(VirtIOSCSICtrlTMFResp)) {
|
| 411 |
virtio_scsi_bad_req(); |
| 412 |
} |
| 413 |
virtio_scsi_do_tmf(s, req); |
| 414 |
|
| 415 |
} else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY || |
| 416 |
req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
|
| 417 |
if (out_size < sizeof(VirtIOSCSICtrlANReq) || |
| 418 |
in_size < sizeof(VirtIOSCSICtrlANResp)) {
|
| 419 |
virtio_scsi_bad_req(); |
| 420 |
} |
| 421 |
req->resp.an->event_actual = 0;
|
| 422 |
req->resp.an->response = VIRTIO_SCSI_S_OK; |
| 423 |
} |
| 424 |
virtio_scsi_complete_req(req); |
| 425 |
} |
| 426 |
} |
| 427 |
|
| 428 |
static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, |
| 429 |
size_t resid) |
| 430 |
{
|
| 431 |
VirtIOSCSIReq *req = r->hba_private; |
| 432 |
|
| 433 |
req->resp.cmd->response = VIRTIO_SCSI_S_OK; |
| 434 |
req->resp.cmd->status = status; |
| 435 |
if (req->resp.cmd->status == GOOD) {
|
| 436 |
req->resp.cmd->resid = resid; |
| 437 |
} else {
|
| 438 |
req->resp.cmd->resid = 0;
|
| 439 |
req->resp.cmd->sense_len = |
| 440 |
scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE); |
| 441 |
} |
| 442 |
virtio_scsi_complete_req(req); |
| 443 |
} |
| 444 |
|
| 445 |
static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
|
| 446 |
{
|
| 447 |
VirtIOSCSIReq *req = r->hba_private; |
| 448 |
|
| 449 |
return &req->qsgl;
|
| 450 |
} |
| 451 |
|
| 452 |
static void virtio_scsi_request_cancelled(SCSIRequest *r) |
| 453 |
{
|
| 454 |
VirtIOSCSIReq *req = r->hba_private; |
| 455 |
|
| 456 |
if (!req) {
|
| 457 |
return;
|
| 458 |
} |
| 459 |
if (req->dev->resetting) {
|
| 460 |
req->resp.cmd->response = VIRTIO_SCSI_S_RESET; |
| 461 |
} else {
|
| 462 |
req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED; |
| 463 |
} |
| 464 |
virtio_scsi_complete_req(req); |
| 465 |
} |
| 466 |
|
| 467 |
static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) |
| 468 |
{
|
| 469 |
req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE; |
| 470 |
virtio_scsi_complete_req(req); |
| 471 |
} |
| 472 |
|
| 473 |
static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) |
| 474 |
{
|
| 475 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 476 |
VirtIOSCSIReq *req; |
| 477 |
int n;
|
| 478 |
|
| 479 |
while ((req = virtio_scsi_pop_req(s, vq))) {
|
| 480 |
SCSIDevice *d; |
| 481 |
int out_size, in_size;
|
| 482 |
if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
| 483 |
virtio_scsi_bad_req(); |
| 484 |
} |
| 485 |
|
| 486 |
out_size = req->elem.out_sg[0].iov_len;
|
| 487 |
in_size = req->elem.in_sg[0].iov_len;
|
| 488 |
if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size || |
| 489 |
in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) {
|
| 490 |
virtio_scsi_bad_req(); |
| 491 |
} |
| 492 |
|
| 493 |
if (req->elem.out_num > 1 && req->elem.in_num > 1) { |
| 494 |
virtio_scsi_fail_cmd_req(req); |
| 495 |
continue;
|
| 496 |
} |
| 497 |
|
| 498 |
d = virtio_scsi_device_find(s, req->req.cmd->lun); |
| 499 |
if (!d) {
|
| 500 |
req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET; |
| 501 |
virtio_scsi_complete_req(req); |
| 502 |
continue;
|
| 503 |
} |
| 504 |
req->sreq = scsi_req_new(d, req->req.cmd->tag, |
| 505 |
virtio_scsi_get_lun(req->req.cmd->lun), |
| 506 |
req->req.cmd->cdb, req); |
| 507 |
|
| 508 |
if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
|
| 509 |
int req_mode =
|
| 510 |
(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
|
| 511 |
|
| 512 |
if (req->sreq->cmd.mode != req_mode ||
|
| 513 |
req->sreq->cmd.xfer > req->qsgl.size) {
|
| 514 |
req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN; |
| 515 |
virtio_scsi_complete_req(req); |
| 516 |
continue;
|
| 517 |
} |
| 518 |
} |
| 519 |
|
| 520 |
n = scsi_req_enqueue(req->sreq); |
| 521 |
if (n) {
|
| 522 |
scsi_req_continue(req->sreq); |
| 523 |
} |
| 524 |
} |
| 525 |
} |
| 526 |
|
| 527 |
static void virtio_scsi_get_config(VirtIODevice *vdev, |
| 528 |
uint8_t *config) |
| 529 |
{
|
| 530 |
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
| 531 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 532 |
|
| 533 |
stl_raw(&scsiconf->num_queues, s->conf->num_queues); |
| 534 |
stl_raw(&scsiconf->seg_max, 128 - 2); |
| 535 |
stl_raw(&scsiconf->max_sectors, s->conf->max_sectors); |
| 536 |
stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun); |
| 537 |
stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
|
| 538 |
stl_raw(&scsiconf->sense_size, s->sense_size); |
| 539 |
stl_raw(&scsiconf->cdb_size, s->cdb_size); |
| 540 |
stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); |
| 541 |
stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); |
| 542 |
stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); |
| 543 |
} |
| 544 |
|
| 545 |
static void virtio_scsi_set_config(VirtIODevice *vdev, |
| 546 |
const uint8_t *config)
|
| 547 |
{
|
| 548 |
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
| 549 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 550 |
|
| 551 |
if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 || |
| 552 |
(uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
|
| 553 |
error_report("bad data written to virtio-scsi configuration space");
|
| 554 |
exit(1);
|
| 555 |
} |
| 556 |
|
| 557 |
s->sense_size = ldl_raw(&scsiconf->sense_size); |
| 558 |
s->cdb_size = ldl_raw(&scsiconf->cdb_size); |
| 559 |
} |
| 560 |
|
| 561 |
static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
|
| 562 |
uint32_t requested_features) |
| 563 |
{
|
| 564 |
requested_features |= (1UL << VIRTIO_SCSI_F_HOTPLUG);
|
| 565 |
requested_features |= (1UL << VIRTIO_SCSI_F_CHANGE);
|
| 566 |
return requested_features;
|
| 567 |
} |
| 568 |
|
| 569 |
static void virtio_scsi_reset(VirtIODevice *vdev) |
| 570 |
{
|
| 571 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 572 |
|
| 573 |
s->sense_size = VIRTIO_SCSI_SENSE_SIZE; |
| 574 |
s->cdb_size = VIRTIO_SCSI_CDB_SIZE; |
| 575 |
s->events_dropped = false;
|
| 576 |
} |
| 577 |
|
| 578 |
/* The device does not have anything to save beyond the virtio data.
|
| 579 |
* Request data is saved with callbacks from SCSI devices.
|
| 580 |
*/
|
| 581 |
static void virtio_scsi_save(QEMUFile *f, void *opaque) |
| 582 |
{
|
| 583 |
VirtIOSCSI *s = opaque; |
| 584 |
virtio_save(&s->vdev, f); |
| 585 |
} |
| 586 |
|
| 587 |
static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id) |
| 588 |
{
|
| 589 |
VirtIOSCSI *s = opaque; |
| 590 |
int ret;
|
| 591 |
|
| 592 |
ret = virtio_load(&s->vdev, f); |
| 593 |
if (ret) {
|
| 594 |
return ret;
|
| 595 |
} |
| 596 |
return 0; |
| 597 |
} |
| 598 |
|
| 599 |
static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, |
| 600 |
uint32_t event, uint32_t reason) |
| 601 |
{
|
| 602 |
VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq); |
| 603 |
VirtIOSCSIEvent *evt; |
| 604 |
int in_size;
|
| 605 |
|
| 606 |
if (!req) {
|
| 607 |
s->events_dropped = true;
|
| 608 |
return;
|
| 609 |
} |
| 610 |
|
| 611 |
if (req->elem.out_num || req->elem.in_num != 1) { |
| 612 |
virtio_scsi_bad_req(); |
| 613 |
} |
| 614 |
|
| 615 |
if (s->events_dropped) {
|
| 616 |
event |= VIRTIO_SCSI_T_EVENTS_MISSED; |
| 617 |
s->events_dropped = false;
|
| 618 |
} |
| 619 |
|
| 620 |
in_size = req->elem.in_sg[0].iov_len;
|
| 621 |
if (in_size < sizeof(VirtIOSCSIEvent)) { |
| 622 |
virtio_scsi_bad_req(); |
| 623 |
} |
| 624 |
|
| 625 |
evt = req->resp.event; |
| 626 |
memset(evt, 0, sizeof(VirtIOSCSIEvent)); |
| 627 |
evt->event = event; |
| 628 |
evt->reason = reason; |
| 629 |
if (!dev) {
|
| 630 |
assert(event == VIRTIO_SCSI_T_NO_EVENT); |
| 631 |
} else {
|
| 632 |
evt->lun[0] = 1; |
| 633 |
evt->lun[1] = dev->id;
|
| 634 |
|
| 635 |
/* Linux wants us to keep the same encoding we use for REPORT LUNS. */
|
| 636 |
if (dev->lun >= 256) { |
| 637 |
evt->lun[2] = (dev->lun >> 8) | 0x40; |
| 638 |
} |
| 639 |
evt->lun[3] = dev->lun & 0xFF; |
| 640 |
} |
| 641 |
virtio_scsi_complete_req(req); |
| 642 |
} |
| 643 |
|
| 644 |
static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) |
| 645 |
{
|
| 646 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 647 |
|
| 648 |
if (s->events_dropped) {
|
| 649 |
virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
| 650 |
} |
| 651 |
} |
| 652 |
|
| 653 |
static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) |
| 654 |
{
|
| 655 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 656 |
|
| 657 |
if (((s->vdev.guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) && |
| 658 |
(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) && |
| 659 |
dev->type != TYPE_ROM) {
|
| 660 |
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, |
| 661 |
sense.asc | (sense.ascq << 8));
|
| 662 |
} |
| 663 |
} |
| 664 |
|
| 665 |
static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev) |
| 666 |
{
|
| 667 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 668 |
|
| 669 |
if (((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) && |
| 670 |
(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
| 671 |
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, |
| 672 |
VIRTIO_SCSI_EVT_RESET_RESCAN); |
| 673 |
} |
| 674 |
} |
| 675 |
|
| 676 |
static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev) |
| 677 |
{
|
| 678 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
| 679 |
|
| 680 |
if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { |
| 681 |
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, |
| 682 |
VIRTIO_SCSI_EVT_RESET_REMOVED); |
| 683 |
} |
| 684 |
} |
| 685 |
|
| 686 |
static struct SCSIBusInfo virtio_scsi_scsi_info = { |
| 687 |
.tcq = true,
|
| 688 |
.max_channel = VIRTIO_SCSI_MAX_CHANNEL, |
| 689 |
.max_target = VIRTIO_SCSI_MAX_TARGET, |
| 690 |
.max_lun = VIRTIO_SCSI_MAX_LUN, |
| 691 |
|
| 692 |
.complete = virtio_scsi_command_complete, |
| 693 |
.cancel = virtio_scsi_request_cancelled, |
| 694 |
.change = virtio_scsi_change, |
| 695 |
.hotplug = virtio_scsi_hotplug, |
| 696 |
.hot_unplug = virtio_scsi_hot_unplug, |
| 697 |
.get_sg_list = virtio_scsi_get_sg_list, |
| 698 |
.save_request = virtio_scsi_save_request, |
| 699 |
.load_request = virtio_scsi_load_request, |
| 700 |
}; |
| 701 |
|
| 702 |
VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf) |
| 703 |
{
|
| 704 |
VirtIOSCSI *s; |
| 705 |
static int virtio_scsi_id; |
| 706 |
size_t sz; |
| 707 |
int i;
|
| 708 |
|
| 709 |
sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *); |
| 710 |
s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
|
| 711 |
sizeof(VirtIOSCSIConfig), sz);
|
| 712 |
|
| 713 |
s->qdev = dev; |
| 714 |
s->conf = proxyconf; |
| 715 |
|
| 716 |
/* TODO set up vdev function pointers */
|
| 717 |
s->vdev.get_config = virtio_scsi_get_config; |
| 718 |
s->vdev.set_config = virtio_scsi_set_config; |
| 719 |
s->vdev.get_features = virtio_scsi_get_features; |
| 720 |
s->vdev.reset = virtio_scsi_reset; |
| 721 |
|
| 722 |
s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, |
| 723 |
virtio_scsi_handle_ctrl); |
| 724 |
s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, |
| 725 |
virtio_scsi_handle_event); |
| 726 |
for (i = 0; i < s->conf->num_queues; i++) { |
| 727 |
s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, |
| 728 |
virtio_scsi_handle_cmd); |
| 729 |
} |
| 730 |
|
| 731 |
scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info); |
| 732 |
if (!dev->hotplugged) {
|
| 733 |
scsi_bus_legacy_handle_cmdline(&s->bus); |
| 734 |
} |
| 735 |
|
| 736 |
register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1, |
| 737 |
virtio_scsi_save, virtio_scsi_load, s); |
| 738 |
|
| 739 |
return &s->vdev;
|
| 740 |
} |
| 741 |
|
| 742 |
void virtio_scsi_exit(VirtIODevice *vdev)
|
| 743 |
{
|
| 744 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
| 745 |
unregister_savevm(s->qdev, "virtio-scsi", s);
|
| 746 |
virtio_cleanup(vdev); |
| 747 |
} |