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/*
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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 "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 |
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#define VIRTIO_SCSI_SENSE_SIZE 96 |
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#define VIRTIO_SCSI_MAX_CHANNEL 0 |
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#define VIRTIO_SCSI_MAX_TARGET 255 |
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#define VIRTIO_SCSI_MAX_LUN 16383 |
26 |
|
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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 |
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#define VIRTIO_SCSI_S_ABORTED 2 |
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#define VIRTIO_SCSI_S_BAD_TARGET 3 |
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#define VIRTIO_SCSI_S_RESET 4 |
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#define VIRTIO_SCSI_S_BUSY 5 |
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#define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6 |
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#define VIRTIO_SCSI_S_TARGET_FAILURE 7 |
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#define VIRTIO_SCSI_S_NEXUS_FAILURE 8 |
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#define VIRTIO_SCSI_S_FAILURE 9 |
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#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10 |
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#define VIRTIO_SCSI_S_FUNCTION_REJECTED 11 |
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#define VIRTIO_SCSI_S_INCORRECT_LUN 12 |
41 |
|
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/* Controlq type codes. */
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#define VIRTIO_SCSI_T_TMF 0 |
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#define VIRTIO_SCSI_T_AN_QUERY 1 |
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#define VIRTIO_SCSI_T_AN_SUBSCRIBE 2 |
46 |
|
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/* Valid TMF subtypes. */
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#define VIRTIO_SCSI_T_TMF_ABORT_TASK 0 |
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#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1 |
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#define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2 |
51 |
#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3 |
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#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4 |
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#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5 |
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#define VIRTIO_SCSI_T_TMF_QUERY_TASK 6 |
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#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7 |
56 |
|
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/* Events. */
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#define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000 |
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#define VIRTIO_SCSI_T_NO_EVENT 0 |
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#define VIRTIO_SCSI_T_TRANSPORT_RESET 1 |
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#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2 |
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#define VIRTIO_SCSI_T_PARAM_CHANGE 3 |
63 |
|
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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 |
68 |
|
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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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/* 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; |
88 |
|
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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; |
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|
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typedef struct { |
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uint8_t response; |
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} QEMU_PACKED VirtIOSCSICtrlTMFResp; |
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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; |
107 |
|
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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; |
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|
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typedef struct { |
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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; |
118 |
|
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typedef struct { |
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uint32_t num_queues; |
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uint32_t seg_max; |
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uint32_t max_sectors; |
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uint32_t cmd_per_lun; |
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uint32_t event_info_size; |
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uint32_t sense_size; |
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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; |
131 |
|
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typedef struct { |
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VirtIODevice vdev; |
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DeviceState *qdev; |
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VirtIOSCSIConf *conf; |
136 |
|
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SCSIBus bus; |
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uint32_t sense_size; |
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uint32_t cdb_size; |
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int resetting;
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bool events_dropped;
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VirtQueue *ctrl_vq; |
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VirtQueue *event_vq; |
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VirtQueue *cmd_vqs[0];
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} VirtIOSCSI; |
146 |
|
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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; |
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QEMUSGList qsgl; |
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SCSIRequest *sreq; |
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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; |
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} req; |
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union {
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char *buf;
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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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} VirtIOSCSIReq; |
167 |
|
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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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} |
172 |
|
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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; |
180 |
} |
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return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun)); |
182 |
} |
183 |
|
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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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virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
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qemu_sglist_destroy(&req->qsgl); |
190 |
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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g_free(req); |
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virtio_notify(&s->vdev, vq); |
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} |
197 |
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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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} |
203 |
|
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static void qemu_sgl_init_external(QEMUSGList *qsgl, struct iovec *sg, |
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hwaddr *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); |
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} |
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} |
212 |
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static void virtio_scsi_parse_req(VirtIOSCSI *s, VirtQueue *vq, |
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VirtIOSCSIReq *req) |
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{ |
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assert(req->elem.in_num); |
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req->vq = vq; |
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req->dev = s; |
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req->sreq = NULL;
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if (req->elem.out_num) {
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req->req.buf = req->elem.out_sg[0].iov_base;
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} |
223 |
req->resp.buf = req->elem.in_sg[0].iov_base;
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if (req->elem.out_num > 1) { |
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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 {
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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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} |
235 |
|
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static VirtIOSCSIReq *virtio_scsi_pop_req(VirtIOSCSI *s, VirtQueue *vq)
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{ |
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VirtIOSCSIReq *req; |
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req = g_malloc(sizeof(*req));
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if (!virtqueue_pop(vq, &req->elem)) {
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g_free(req); |
242 |
return NULL; |
243 |
} |
244 |
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virtio_scsi_parse_req(s, vq, req); |
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return req;
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} |
248 |
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static void virtio_scsi_save_request(QEMUFile *f, SCSIRequest *sreq) |
250 |
{ |
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VirtIOSCSIReq *req = sreq->hba_private; |
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uint32_t n = virtio_queue_get_id(req->vq) - 2;
|
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|
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assert(n < req->dev->conf->num_queues); |
255 |
qemu_put_be32s(f, &n); |
256 |
qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); |
257 |
} |
258 |
|
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static void *virtio_scsi_load_request(QEMUFile *f, SCSIRequest *sreq) |
260 |
{ |
261 |
SCSIBus *bus = sreq->bus; |
262 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
263 |
VirtIOSCSIReq *req; |
264 |
uint32_t n; |
265 |
|
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req = g_malloc(sizeof(*req));
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qemu_get_be32s(f, &n); |
268 |
assert(n < s->conf->num_queues); |
269 |
qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem)); |
270 |
virtio_scsi_parse_req(s, s->cmd_vqs[n], req); |
271 |
|
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scsi_req_ref(sreq); |
273 |
req->sreq = sreq; |
274 |
if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
|
275 |
int req_mode =
|
276 |
(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
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277 |
|
278 |
assert(req->sreq->cmd.mode == req_mode); |
279 |
} |
280 |
return req;
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281 |
} |
282 |
|
283 |
static void virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req) |
284 |
{ |
285 |
SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun); |
286 |
SCSIRequest *r, *next; |
287 |
BusChild *kid; |
288 |
int target;
|
289 |
|
290 |
/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
|
291 |
req->resp.tmf->response = VIRTIO_SCSI_S_OK; |
292 |
|
293 |
switch (req->req.tmf->subtype) {
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294 |
case VIRTIO_SCSI_T_TMF_ABORT_TASK:
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295 |
case VIRTIO_SCSI_T_TMF_QUERY_TASK:
|
296 |
if (!d) {
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297 |
goto fail;
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298 |
} |
299 |
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
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300 |
goto incorrect_lun;
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301 |
} |
302 |
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { |
303 |
VirtIOSCSIReq *cmd_req = r->hba_private; |
304 |
if (cmd_req && cmd_req->req.cmd->tag == req->req.tmf->tag) {
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305 |
break;
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306 |
} |
307 |
} |
308 |
if (r) {
|
309 |
/*
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310 |
* Assert that the request has not been completed yet, we
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311 |
* check for it in the loop above.
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312 |
*/
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313 |
assert(r->hba_private); |
314 |
if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
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315 |
/* "If the specified command is present in the task set, then
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316 |
* return a service response set to FUNCTION SUCCEEDED".
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317 |
*/
|
318 |
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
319 |
} else {
|
320 |
scsi_req_cancel(r); |
321 |
} |
322 |
} |
323 |
break;
|
324 |
|
325 |
case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
|
326 |
if (!d) {
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327 |
goto fail;
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328 |
} |
329 |
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
|
330 |
goto incorrect_lun;
|
331 |
} |
332 |
s->resetting++; |
333 |
qdev_reset_all(&d->qdev); |
334 |
s->resetting--; |
335 |
break;
|
336 |
|
337 |
case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
|
338 |
case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
|
339 |
case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
|
340 |
if (!d) {
|
341 |
goto fail;
|
342 |
} |
343 |
if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
|
344 |
goto incorrect_lun;
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345 |
} |
346 |
QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) { |
347 |
if (r->hba_private) {
|
348 |
if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
|
349 |
/* "If there is any command present in the task set, then
|
350 |
* return a service response set to FUNCTION SUCCEEDED".
|
351 |
*/
|
352 |
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED; |
353 |
break;
|
354 |
} else {
|
355 |
scsi_req_cancel(r); |
356 |
} |
357 |
} |
358 |
} |
359 |
break;
|
360 |
|
361 |
case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
|
362 |
target = req->req.tmf->lun[1];
|
363 |
s->resetting++; |
364 |
QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { |
365 |
d = DO_UPCAST(SCSIDevice, qdev, kid->child); |
366 |
if (d->channel == 0 && d->id == target) { |
367 |
qdev_reset_all(&d->qdev); |
368 |
} |
369 |
} |
370 |
s->resetting--; |
371 |
break;
|
372 |
|
373 |
case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
|
374 |
default:
|
375 |
req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED; |
376 |
break;
|
377 |
} |
378 |
|
379 |
return;
|
380 |
|
381 |
incorrect_lun:
|
382 |
req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN; |
383 |
return;
|
384 |
|
385 |
fail:
|
386 |
req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET; |
387 |
} |
388 |
|
389 |
static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
390 |
{ |
391 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
392 |
VirtIOSCSIReq *req; |
393 |
|
394 |
while ((req = virtio_scsi_pop_req(s, vq))) {
|
395 |
int out_size, in_size;
|
396 |
if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
397 |
virtio_scsi_bad_req(); |
398 |
continue;
|
399 |
} |
400 |
|
401 |
out_size = req->elem.out_sg[0].iov_len;
|
402 |
in_size = req->elem.in_sg[0].iov_len;
|
403 |
if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
|
404 |
if (out_size < sizeof(VirtIOSCSICtrlTMFReq) || |
405 |
in_size < sizeof(VirtIOSCSICtrlTMFResp)) {
|
406 |
virtio_scsi_bad_req(); |
407 |
} |
408 |
virtio_scsi_do_tmf(s, req); |
409 |
|
410 |
} else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY || |
411 |
req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) { |
412 |
if (out_size < sizeof(VirtIOSCSICtrlANReq) || |
413 |
in_size < sizeof(VirtIOSCSICtrlANResp)) {
|
414 |
virtio_scsi_bad_req(); |
415 |
} |
416 |
req->resp.an->event_actual = 0;
|
417 |
req->resp.an->response = VIRTIO_SCSI_S_OK; |
418 |
} |
419 |
virtio_scsi_complete_req(req); |
420 |
} |
421 |
} |
422 |
|
423 |
static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status, |
424 |
size_t resid) |
425 |
{ |
426 |
VirtIOSCSIReq *req = r->hba_private; |
427 |
|
428 |
req->resp.cmd->response = VIRTIO_SCSI_S_OK; |
429 |
req->resp.cmd->status = status; |
430 |
if (req->resp.cmd->status == GOOD) {
|
431 |
req->resp.cmd->resid = resid; |
432 |
} else {
|
433 |
req->resp.cmd->resid = 0;
|
434 |
req->resp.cmd->sense_len = |
435 |
scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE); |
436 |
} |
437 |
virtio_scsi_complete_req(req); |
438 |
} |
439 |
|
440 |
static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
|
441 |
{ |
442 |
VirtIOSCSIReq *req = r->hba_private; |
443 |
|
444 |
return &req->qsgl;
|
445 |
} |
446 |
|
447 |
static void virtio_scsi_request_cancelled(SCSIRequest *r) |
448 |
{ |
449 |
VirtIOSCSIReq *req = r->hba_private; |
450 |
|
451 |
if (!req) {
|
452 |
return;
|
453 |
} |
454 |
if (req->dev->resetting) {
|
455 |
req->resp.cmd->response = VIRTIO_SCSI_S_RESET; |
456 |
} else {
|
457 |
req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED; |
458 |
} |
459 |
virtio_scsi_complete_req(req); |
460 |
} |
461 |
|
462 |
static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req) |
463 |
{ |
464 |
req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE; |
465 |
virtio_scsi_complete_req(req); |
466 |
} |
467 |
|
468 |
static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) |
469 |
{ |
470 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
471 |
VirtIOSCSIReq *req; |
472 |
int n;
|
473 |
|
474 |
while ((req = virtio_scsi_pop_req(s, vq))) {
|
475 |
SCSIDevice *d; |
476 |
int out_size, in_size;
|
477 |
if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
478 |
virtio_scsi_bad_req(); |
479 |
} |
480 |
|
481 |
out_size = req->elem.out_sg[0].iov_len;
|
482 |
in_size = req->elem.in_sg[0].iov_len;
|
483 |
if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size || |
484 |
in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) {
|
485 |
virtio_scsi_bad_req(); |
486 |
} |
487 |
|
488 |
if (req->elem.out_num > 1 && req->elem.in_num > 1) { |
489 |
virtio_scsi_fail_cmd_req(req); |
490 |
continue;
|
491 |
} |
492 |
|
493 |
d = virtio_scsi_device_find(s, req->req.cmd->lun); |
494 |
if (!d) {
|
495 |
req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET; |
496 |
virtio_scsi_complete_req(req); |
497 |
continue;
|
498 |
} |
499 |
req->sreq = scsi_req_new(d, req->req.cmd->tag, |
500 |
virtio_scsi_get_lun(req->req.cmd->lun), |
501 |
req->req.cmd->cdb, req); |
502 |
|
503 |
if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
|
504 |
int req_mode =
|
505 |
(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
|
506 |
|
507 |
if (req->sreq->cmd.mode != req_mode ||
|
508 |
req->sreq->cmd.xfer > req->qsgl.size) { |
509 |
req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN; |
510 |
virtio_scsi_complete_req(req); |
511 |
continue;
|
512 |
} |
513 |
} |
514 |
|
515 |
n = scsi_req_enqueue(req->sreq); |
516 |
if (n) {
|
517 |
scsi_req_continue(req->sreq); |
518 |
} |
519 |
} |
520 |
} |
521 |
|
522 |
static void virtio_scsi_get_config(VirtIODevice *vdev, |
523 |
uint8_t *config) |
524 |
{ |
525 |
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
526 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
527 |
|
528 |
stl_raw(&scsiconf->num_queues, s->conf->num_queues); |
529 |
stl_raw(&scsiconf->seg_max, 128 - 2); |
530 |
stl_raw(&scsiconf->max_sectors, s->conf->max_sectors); |
531 |
stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun); |
532 |
stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
|
533 |
stl_raw(&scsiconf->sense_size, s->sense_size); |
534 |
stl_raw(&scsiconf->cdb_size, s->cdb_size); |
535 |
stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); |
536 |
stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET); |
537 |
stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN); |
538 |
} |
539 |
|
540 |
static void virtio_scsi_set_config(VirtIODevice *vdev, |
541 |
const uint8_t *config)
|
542 |
{ |
543 |
VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; |
544 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
545 |
|
546 |
if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 || |
547 |
(uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
|
548 |
error_report("bad data written to virtio-scsi configuration space");
|
549 |
exit(1);
|
550 |
} |
551 |
|
552 |
s->sense_size = ldl_raw(&scsiconf->sense_size); |
553 |
s->cdb_size = ldl_raw(&scsiconf->cdb_size); |
554 |
} |
555 |
|
556 |
static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
|
557 |
uint32_t requested_features) |
558 |
{ |
559 |
return requested_features;
|
560 |
} |
561 |
|
562 |
static void virtio_scsi_reset(VirtIODevice *vdev) |
563 |
{ |
564 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
565 |
|
566 |
s->sense_size = VIRTIO_SCSI_SENSE_SIZE; |
567 |
s->cdb_size = VIRTIO_SCSI_CDB_SIZE; |
568 |
s->events_dropped = false;
|
569 |
} |
570 |
|
571 |
/* The device does not have anything to save beyond the virtio data.
|
572 |
* Request data is saved with callbacks from SCSI devices.
|
573 |
*/
|
574 |
static void virtio_scsi_save(QEMUFile *f, void *opaque) |
575 |
{ |
576 |
VirtIOSCSI *s = opaque; |
577 |
virtio_save(&s->vdev, f); |
578 |
} |
579 |
|
580 |
static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id) |
581 |
{ |
582 |
VirtIOSCSI *s = opaque; |
583 |
int ret;
|
584 |
|
585 |
ret = virtio_load(&s->vdev, f); |
586 |
if (ret) {
|
587 |
return ret;
|
588 |
} |
589 |
return 0; |
590 |
} |
591 |
|
592 |
static void virtio_scsi_push_event(VirtIOSCSI *s, SCSIDevice *dev, |
593 |
uint32_t event, uint32_t reason) |
594 |
{ |
595 |
VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq); |
596 |
VirtIOSCSIEvent *evt; |
597 |
int in_size;
|
598 |
|
599 |
if (!req) {
|
600 |
s->events_dropped = true;
|
601 |
return;
|
602 |
} |
603 |
|
604 |
if (req->elem.out_num || req->elem.in_num != 1) { |
605 |
virtio_scsi_bad_req(); |
606 |
} |
607 |
|
608 |
if (s->events_dropped) {
|
609 |
event |= VIRTIO_SCSI_T_EVENTS_MISSED; |
610 |
s->events_dropped = false;
|
611 |
} |
612 |
|
613 |
in_size = req->elem.in_sg[0].iov_len;
|
614 |
if (in_size < sizeof(VirtIOSCSIEvent)) { |
615 |
virtio_scsi_bad_req(); |
616 |
} |
617 |
|
618 |
evt = req->resp.event; |
619 |
memset(evt, 0, sizeof(VirtIOSCSIEvent)); |
620 |
evt->event = event; |
621 |
evt->reason = reason; |
622 |
if (!dev) {
|
623 |
assert(event == VIRTIO_SCSI_T_NO_EVENT); |
624 |
} else {
|
625 |
evt->lun[0] = 1; |
626 |
evt->lun[1] = dev->id;
|
627 |
|
628 |
/* Linux wants us to keep the same encoding we use for REPORT LUNS. */
|
629 |
if (dev->lun >= 256) { |
630 |
evt->lun[2] = (dev->lun >> 8) | 0x40; |
631 |
} |
632 |
evt->lun[3] = dev->lun & 0xFF; |
633 |
} |
634 |
virtio_scsi_complete_req(req); |
635 |
} |
636 |
|
637 |
static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq) |
638 |
{ |
639 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
640 |
|
641 |
if (s->events_dropped) {
|
642 |
virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0); |
643 |
} |
644 |
} |
645 |
|
646 |
static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense) |
647 |
{ |
648 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
649 |
|
650 |
if (((s->vdev.guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) && |
651 |
(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) && |
652 |
dev->type != TYPE_ROM) { |
653 |
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE, |
654 |
sense.asc | (sense.ascq << 8));
|
655 |
} |
656 |
} |
657 |
|
658 |
static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev) |
659 |
{ |
660 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
661 |
|
662 |
if (((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) && |
663 |
(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
664 |
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, |
665 |
VIRTIO_SCSI_EVT_RESET_RESCAN); |
666 |
} |
667 |
} |
668 |
|
669 |
static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev) |
670 |
{ |
671 |
VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus); |
672 |
|
673 |
if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) { |
674 |
virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET, |
675 |
VIRTIO_SCSI_EVT_RESET_REMOVED); |
676 |
} |
677 |
} |
678 |
|
679 |
static struct SCSIBusInfo virtio_scsi_scsi_info = { |
680 |
.tcq = true,
|
681 |
.max_channel = VIRTIO_SCSI_MAX_CHANNEL, |
682 |
.max_target = VIRTIO_SCSI_MAX_TARGET, |
683 |
.max_lun = VIRTIO_SCSI_MAX_LUN, |
684 |
|
685 |
.complete = virtio_scsi_command_complete, |
686 |
.cancel = virtio_scsi_request_cancelled, |
687 |
.change = virtio_scsi_change, |
688 |
.hotplug = virtio_scsi_hotplug, |
689 |
.hot_unplug = virtio_scsi_hot_unplug, |
690 |
.get_sg_list = virtio_scsi_get_sg_list, |
691 |
.save_request = virtio_scsi_save_request, |
692 |
.load_request = virtio_scsi_load_request, |
693 |
}; |
694 |
|
695 |
VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf) |
696 |
{ |
697 |
VirtIOSCSI *s; |
698 |
static int virtio_scsi_id; |
699 |
size_t sz; |
700 |
int i;
|
701 |
|
702 |
sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *); |
703 |
s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
|
704 |
sizeof(VirtIOSCSIConfig), sz);
|
705 |
|
706 |
s->qdev = dev; |
707 |
s->conf = proxyconf; |
708 |
|
709 |
/* TODO set up vdev function pointers */
|
710 |
s->vdev.get_config = virtio_scsi_get_config; |
711 |
s->vdev.set_config = virtio_scsi_set_config; |
712 |
s->vdev.get_features = virtio_scsi_get_features; |
713 |
s->vdev.reset = virtio_scsi_reset; |
714 |
|
715 |
s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, |
716 |
virtio_scsi_handle_ctrl); |
717 |
s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, |
718 |
virtio_scsi_handle_event); |
719 |
for (i = 0; i < s->conf->num_queues; i++) { |
720 |
s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, |
721 |
virtio_scsi_handle_cmd); |
722 |
} |
723 |
|
724 |
scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info); |
725 |
if (!dev->hotplugged) {
|
726 |
scsi_bus_legacy_handle_cmdline(&s->bus); |
727 |
} |
728 |
|
729 |
register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1, |
730 |
virtio_scsi_save, virtio_scsi_load, s); |
731 |
|
732 |
return &s->vdev;
|
733 |
} |
734 |
|
735 |
void virtio_scsi_exit(VirtIODevice *vdev)
|
736 |
{ |
737 |
VirtIOSCSI *s = (VirtIOSCSI *)vdev; |
738 |
unregister_savevm(s->qdev, "virtio-scsi", s);
|
739 |
virtio_cleanup(vdev); |
740 |
} |