diff options
Diffstat (limited to 'hw/virtio-scsi.c')
| -rw-r--r-- | hw/virtio-scsi.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c new file mode 100644 index 000000000..a297fedd0 --- /dev/null +++ b/hw/virtio-scsi.c @@ -0,0 +1,228 @@ +/* + * 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 "virtio-scsi.h" +#include <hw/scsi.h> +#include <hw/scsi-defs.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 + +/* 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 { + VirtIODevice vdev; + DeviceState *qdev; + VirtIOSCSIConf *conf; + + VirtQueue *ctrl_vq; + VirtQueue *event_vq; + VirtQueue *cmd_vq; + uint32_t sense_size; + uint32_t cdb_size; +} VirtIOSCSI; + +static void virtio_scsi_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) +{ + /* TODO */ +} + +static void virtio_scsi_handle_cmd(VirtIODevice *vdev, VirtQueue *vq) +{ + /* TODO */ +} + +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); + stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL); + stl_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->sense_size = VIRTIO_SCSI_SENSE_SIZE; + s->cdb_size = VIRTIO_SCSI_CDB_SIZE; +} + +VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf) +{ + VirtIOSCSI *s; + + s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI, + sizeof(VirtIOSCSIConfig), + sizeof(VirtIOSCSI)); + + s->qdev = dev; + s->conf = proxyconf; + + /* TODO set up vdev function pointers */ + s->vdev.get_config = virtio_scsi_get_config; + s->vdev.set_config = virtio_scsi_set_config; + s->vdev.get_features = virtio_scsi_get_features; + s->vdev.reset = virtio_scsi_reset; + + s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, + virtio_scsi_handle_ctrl); + s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, + NULL); + s->cmd_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE, + virtio_scsi_handle_cmd); + + /* TODO savevm */ + + return &s->vdev; +} + +void virtio_scsi_exit(VirtIODevice *vdev) +{ + virtio_cleanup(vdev); +} |