[qemu.git] / hw / virtio-scsi.c

/*
 * Virtio SCSI HBA
 *
 * Copyright IBM, Corp. 2010
 * Copyright Red Hat, Inc. 2011
 *
 * Authors:
 *   Stefan Hajnoczi    <[email protected]>
 *   Paolo Bonzini      <[email protected]>
 *
 * 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;

    SCSIBus bus;
    uint32_t sense_size;
    uint32_t cdb_size;
    int resetting;
    VirtQueue *ctrl_vq;
    VirtQueue *event_vq;
    VirtQueue *cmd_vqs[0];
} VirtIOSCSI;

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;
    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(&s->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,
                                   target_phys_addr_t *addr, int num)
{
    memset(qsgl, 0, sizeof(*qsgl));
    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.out_num && req->elem.in_num);
    req->vq = vq;
    req->dev = s;
    req->sreq = NULL;
    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) {
            if (r->tag == req->req.tmf->tag) {
                break;
            }
        }
        if (r && 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;

    req->resp.cmd->response = VIRTIO_SCSI_S_OK;
    req->resp.cmd->status = status;
    if (req->resp.cmd->status == GOOD) {
        req->resp.cmd->resid = resid;
    } else {
        req->resp.cmd->resid = 0;
        req->resp.cmd->sense_len =
            scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE);
    }
    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);
    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;
}

/* 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)
{
    VirtIOSCSI *s = opaque;
    virtio_save(&s->vdev, f);
}

static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
{
    VirtIOSCSI *s = opaque;
    int ret;

    ret = virtio_load(&s->vdev, f);
    if (ret) {
        return ret;
    }
    return 0;
}

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,
    .get_sg_list = virtio_scsi_get_sg_list,
    .save_request = virtio_scsi_save_request,
    .load_request = virtio_scsi_load_request,
};

VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
{
    VirtIOSCSI *s;
    static int virtio_scsi_id;
    size_t sz;
    int i;

    sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *);
    s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
                                         sizeof(VirtIOSCSIConfig), sz);

    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);
    for (i = 0; i < s->conf->num_queues; i++) {
        s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
                                         virtio_scsi_handle_cmd);
    }

    scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info);
    if (!dev->hotplugged) {
        scsi_bus_legacy_handle_cmdline(&s->bus);
    }

    register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
                    virtio_scsi_save, virtio_scsi_load, s);

    return &s->vdev;
}

void virtio_scsi_exit(VirtIODevice *vdev)
{
    VirtIOSCSI *s = (VirtIOSCSI *)vdev;
    unregister_savevm(s->qdev, "virtio-scsi", s);
    virtio_cleanup(vdev);
}
Commit	Line	Data
973abc7f SH	1	/*
	2	* Virtio SCSI HBA
	3	*
	4	* Copyright IBM, Corp. 2010
	5	* Copyright Red Hat, Inc. 2011
	6	*
	7	* Authors:
	8	* Stefan Hajnoczi <[email protected]>
	9	* Paolo Bonzini <[email protected]>
	10	*
	11	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	12	* See the COPYING file in the top-level directory.
	13	*
	14	*/
	15
	16	#include "virtio-scsi.h"
	17	#include <hw/scsi.h>
	18	#include <hw/scsi-defs.h>
	19
	20	#define VIRTIO_SCSI_VQ_SIZE 128
	21	#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	/* Response codes */
	28	#define VIRTIO_SCSI_S_OK 0
	29	#define VIRTIO_SCSI_S_OVERRUN 1
	30	#define VIRTIO_SCSI_S_ABORTED 2
	31	#define VIRTIO_SCSI_S_BAD_TARGET 3
	32	#define VIRTIO_SCSI_S_RESET 4
	33	#define VIRTIO_SCSI_S_BUSY 5
	34	#define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6
	35	#define VIRTIO_SCSI_S_TARGET_FAILURE 7
	36	#define VIRTIO_SCSI_S_NEXUS_FAILURE 8
	37	#define VIRTIO_SCSI_S_FAILURE 9
	38	#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10
	39	#define VIRTIO_SCSI_S_FUNCTION_REJECTED 11
	40	#define VIRTIO_SCSI_S_INCORRECT_LUN 12
	41
	42	/* Controlq type codes. */
	43	#define VIRTIO_SCSI_T_TMF 0
	44	#define VIRTIO_SCSI_T_AN_QUERY 1
	45	#define VIRTIO_SCSI_T_AN_SUBSCRIBE 2
	46
	47	/* Valid TMF subtypes. */
	48	#define VIRTIO_SCSI_T_TMF_ABORT_TASK 0
	49	#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1
	50	#define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2
	51	#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3
	52	#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4
	53	#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5
	54	#define VIRTIO_SCSI_T_TMF_QUERY_TASK 6
	55	#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7
	56
	57	/* Events. */
	58	#define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000
	59	#define VIRTIO_SCSI_T_NO_EVENT 0
	60	#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
	61	#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
	62
	63	/* SCSI command request, followed by data-out */
	64	typedef struct {
65	uint8_t lun[8]; /* Logical Unit Number */
66	uint64_t tag; /* Command identifier */
67	uint8_t task_attr; /* Task attribute */
68	uint8_t prio;
69	uint8_t crn;
70	uint8_t cdb[];
71	} QEMU_PACKED VirtIOSCSICmdReq;
72
73	/* Response, followed by sense data and data-in */
74	typedef struct {
75	uint32_t sense_len; /* Sense data length */
76	uint32_t resid; /* Residual bytes in data buffer */
77	uint16_t status_qualifier; /* Status qualifier */
78	uint8_t status; /* Command completion status */
79	uint8_t response; /* Response values */
80	uint8_t sense[];
81	} QEMU_PACKED VirtIOSCSICmdResp;
82
83	/* Task Management Request */
84	typedef struct {
85	uint32_t type;
86	uint32_t subtype;
87	uint8_t lun[8];
88	uint64_t tag;
89	} QEMU_PACKED VirtIOSCSICtrlTMFReq;
90
91	typedef struct {
92	uint8_t response;
93	} QEMU_PACKED VirtIOSCSICtrlTMFResp;
94
95	/* Asynchronous notification query/subscription */
96	typedef struct {
97	uint32_t type;
98	uint8_t lun[8];
99	uint32_t event_requested;
100	} QEMU_PACKED VirtIOSCSICtrlANReq;
101
102	typedef struct {
103	uint32_t event_actual;
104	uint8_t response;
105	} QEMU_PACKED VirtIOSCSICtrlANResp;
106
107	typedef struct {
108	uint32_t event;
109	uint8_t lun[8];
110	uint32_t reason;
111	} QEMU_PACKED VirtIOSCSIEvent;
112
113	typedef struct {
114	uint32_t num_queues;
115	uint32_t seg_max;
116	uint32_t max_sectors;
117	uint32_t cmd_per_lun;
118	uint32_t event_info_size;
119	uint32_t sense_size;
120	uint32_t cdb_size;
121	uint16_t max_channel;
122	uint16_t max_target;
123	uint32_t max_lun;
124	} QEMU_PACKED VirtIOSCSIConfig;
125
126	typedef struct {
127	VirtIODevice vdev;
128	DeviceState *qdev;
129	VirtIOSCSIConf *conf;
130
2ccdcd8d	131	SCSIBus bus;
973abc7f SH	132	uint32_t sense_size;
973abc7f SH	133	uint32_t cdb_size;
06114d72	134	int resetting;
d2ad7dd4 PB	135	VirtQueue *ctrl_vq;
	136	VirtQueue *event_vq;
	137	VirtQueue *cmd_vqs[0];
973abc7f SH	138	} VirtIOSCSI;
973abc7f SH	139
326799c0 SH	140	typedef struct VirtIOSCSIReq {
	141	VirtIOSCSI *dev;
	142	VirtQueue *vq;
	143	VirtQueueElement elem;
	144	QEMUSGList qsgl;
	145	SCSIRequest *sreq;
	146	union {
	147	char *buf;
	148	VirtIOSCSICmdReq *cmd;
	149	VirtIOSCSICtrlTMFReq *tmf;
	150	VirtIOSCSICtrlANReq *an;
	151	} req;
	152	union {
	153	char *buf;
	154	VirtIOSCSICmdResp *cmd;
	155	VirtIOSCSICtrlTMFResp *tmf;
	156	VirtIOSCSICtrlANResp *an;
	157	VirtIOSCSIEvent *event;
	158	} resp;
	159	} VirtIOSCSIReq;
	160
2ccdcd8d PB	161	static inline int virtio_scsi_get_lun(uint8_t *lun)
	162	{
	163	return ((lun[2] << 8) \| lun[3]) & 0x3FFF;
	164	}
	165
	166	static inline SCSIDevice virtio_scsi_device_find(VirtIOSCSI s, uint8_t *lun)
	167	{
	168	if (lun[0] != 1) {
	169	return NULL;
	170	}
	171	if (lun[2] != 0 && !(lun[2] >= 0x40 && lun[2] < 0x80)) {
	172	return NULL;
	173	}
	174	return scsi_device_find(&s->bus, 0, lun[1], virtio_scsi_get_lun(lun));
	175	}
	176
326799c0 SH	177	static void virtio_scsi_complete_req(VirtIOSCSIReq *req)
	178	{
	179	VirtIOSCSI *s = req->dev;
	180	VirtQueue *vq = req->vq;
	181	virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
	182	qemu_sglist_destroy(&req->qsgl);
	183	if (req->sreq) {
	184	req->sreq->hba_private = NULL;
	185	scsi_req_unref(req->sreq);
	186	}
	187	g_free(req);
	188	virtio_notify(&s->vdev, vq);
	189	}
	190
	191	static void virtio_scsi_bad_req(void)
	192	{
	193	error_report("wrong size for virtio-scsi headers");
	194	exit(1);
	195	}
	196
	197	static void qemu_sgl_init_external(QEMUSGList qsgl, struct iovec sg,
	198	target_phys_addr_t *addr, int num)
	199	{
	200	memset(qsgl, 0, sizeof(*qsgl));
	201	while (num--) {
	202	qemu_sglist_add(qsgl, *(addr++), (sg++)->iov_len);
	203	}
	204	}
	205
	206	static void virtio_scsi_parse_req(VirtIOSCSI s, VirtQueue vq,
	207	VirtIOSCSIReq *req)
	208	{
	209	assert(req->elem.out_num && req->elem.in_num);
	210	req->vq = vq;
	211	req->dev = s;
	212	req->sreq = NULL;
	213	req->req.buf = req->elem.out_sg[0].iov_base;
	214	req->resp.buf = req->elem.in_sg[0].iov_base;
	215
	216	if (req->elem.out_num > 1) {
	217	qemu_sgl_init_external(&req->qsgl, &req->elem.out_sg[1],
	218	&req->elem.out_addr[1],
	219	req->elem.out_num - 1);
	220	} else {
	221	qemu_sgl_init_external(&req->qsgl, &req->elem.in_sg[1],
	222	&req->elem.in_addr[1],
	223	req->elem.in_num - 1);
	224	}
	225	}
	226
	227	static VirtIOSCSIReq virtio_scsi_pop_req(VirtIOSCSI s, VirtQueue *vq)
	228	{
	229	VirtIOSCSIReq *req;
	230	req = g_malloc(sizeof(*req));
	231	if (!virtqueue_pop(vq, &req->elem)) {
	232	g_free(req);
	233	return NULL;
	234	}
	235
	236	virtio_scsi_parse_req(s, vq, req);
	237	return req;
	238	}
	239
5db1764c PB	240	static void virtio_scsi_save_request(QEMUFile f, SCSIRequest sreq)
	241	{
	242	VirtIOSCSIReq *req = sreq->hba_private;
d2ad7dd4	243	uint32_t n = virtio_queue_get_id(req->vq) - 2;
5db1764c	244
d2ad7dd4	245	assert(n < req->dev->conf->num_queues);
fcf104a7	246	qemu_put_be32s(f, &n);
5db1764c PB	247	qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
	248	}
	249
	250	static void virtio_scsi_load_request(QEMUFile f, SCSIRequest *sreq)
	251	{
	252	SCSIBus *bus = sreq->bus;
	253	VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
	254	VirtIOSCSIReq *req;
fcf104a7	255	uint32_t n;
5db1764c PB	256
5db1764c PB	257	req = g_malloc(sizeof(*req));
fcf104a7	258	qemu_get_be32s(f, &n);
d2ad7dd4	259	assert(n < s->conf->num_queues);
5db1764c	260	qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
d2ad7dd4	261	virtio_scsi_parse_req(s, s->cmd_vqs[n], req);
5db1764c PB	262
	263	scsi_req_ref(sreq);
	264	req->sreq = sreq;
	265	if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
	266	int req_mode =
	267	(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
	268
	269	assert(req->sreq->cmd.mode == req_mode);
	270	}
	271	return req;
	272	}
	273
06114d72	274	static void virtio_scsi_do_tmf(VirtIOSCSI s, VirtIOSCSIReq req)
326799c0	275	{
06114d72 PB	276	SCSIDevice *d = virtio_scsi_device_find(s, req->req.tmf->lun);
06114d72 PB	277	SCSIRequest r, next;
0866aca1	278	BusChild *kid;
06114d72 PB	279	int target;
	280
	281	/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
	282	req->resp.tmf->response = VIRTIO_SCSI_S_OK;
	283
	284	switch (req->req.tmf->subtype) {
	285	case VIRTIO_SCSI_T_TMF_ABORT_TASK:
	286	case VIRTIO_SCSI_T_TMF_QUERY_TASK:
	287	if (!d) {
	288	goto fail;
	289	}
	290	if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
	291	goto incorrect_lun;
	292	}
	293	QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
	294	if (r->tag == req->req.tmf->tag) {
	295	break;
	296	}
	297	}
	298	if (r && r->hba_private) {
	299	if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK) {
	300	/* "If the specified command is present in the task set, then
	301	* return a service response set to FUNCTION SUCCEEDED".
	302	*/
	303	req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
	304	} else {
	305	scsi_req_cancel(r);
	306	}
	307	}
	308	break;
	309
	310	case VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET:
	311	if (!d) {
	312	goto fail;
	313	}
	314	if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
	315	goto incorrect_lun;
	316	}
	317	s->resetting++;
	318	qdev_reset_all(&d->qdev);
	319	s->resetting--;
	320	break;
	321
	322	case VIRTIO_SCSI_T_TMF_ABORT_TASK_SET:
	323	case VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET:
	324	case VIRTIO_SCSI_T_TMF_QUERY_TASK_SET:
	325	if (!d) {
	326	goto fail;
	327	}
	328	if (d->lun != virtio_scsi_get_lun(req->req.tmf->lun)) {
	329	goto incorrect_lun;
	330	}
	331	QTAILQ_FOREACH_SAFE(r, &d->requests, next, next) {
	332	if (r->hba_private) {
	333	if (req->req.tmf->subtype == VIRTIO_SCSI_T_TMF_QUERY_TASK_SET) {
	334	/* "If there is any command present in the task set, then
	335	* return a service response set to FUNCTION SUCCEEDED".
	336	*/
	337	req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_SUCCEEDED;
	338	break;
	339	} else {
	340	scsi_req_cancel(r);
	341	}
	342	}
343	}
344	break;
345
346	case VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET:
347	target = req->req.tmf->lun[1];
348	s->resetting++;
0866aca1 AL	349	QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) {
0866aca1 AL	350	d = DO_UPCAST(SCSIDevice, qdev, kid->child);
06114d72 PB	351	if (d->channel == 0 && d->id == target) {
	352	qdev_reset_all(&d->qdev);
	353	}
	354	}
	355	s->resetting--;
	356	break;
	357
	358	case VIRTIO_SCSI_T_TMF_CLEAR_ACA:
	359	default:
	360	req->resp.tmf->response = VIRTIO_SCSI_S_FUNCTION_REJECTED;
	361	break;
326799c0 SH	362	}
326799c0 SH	363
06114d72 PB	364	return;
	365
	366	incorrect_lun:
	367	req->resp.tmf->response = VIRTIO_SCSI_S_INCORRECT_LUN;
	368	return;
	369
	370	fail:
	371	req->resp.tmf->response = VIRTIO_SCSI_S_BAD_TARGET;
326799c0 SH	372	}
326799c0 SH	373
973abc7f SH	374	static void virtio_scsi_handle_ctrl(VirtIODevice vdev, VirtQueue vq)
973abc7f SH	375	{
326799c0 SH	376	VirtIOSCSI s = (VirtIOSCSI )vdev;
	377	VirtIOSCSIReq *req;
	378
	379	while ((req = virtio_scsi_pop_req(s, vq))) {
06114d72 PB	380	int out_size, in_size;
	381	if (req->elem.out_num < 1 \|\| req->elem.in_num < 1) {
	382	virtio_scsi_bad_req();
	383	continue;
	384	}
	385
	386	out_size = req->elem.out_sg[0].iov_len;
	387	in_size = req->elem.in_sg[0].iov_len;
	388	if (req->req.tmf->type == VIRTIO_SCSI_T_TMF) {
	389	if (out_size < sizeof(VirtIOSCSICtrlTMFReq) \|\|
	390	in_size < sizeof(VirtIOSCSICtrlTMFResp)) {
	391	virtio_scsi_bad_req();
	392	}
	393	virtio_scsi_do_tmf(s, req);
	394
	395	} else if (req->req.tmf->type == VIRTIO_SCSI_T_AN_QUERY \|\|
	396	req->req.tmf->type == VIRTIO_SCSI_T_AN_SUBSCRIBE) {
	397	if (out_size < sizeof(VirtIOSCSICtrlANReq) \|\|
	398	in_size < sizeof(VirtIOSCSICtrlANResp)) {
	399	virtio_scsi_bad_req();
	400	}
	401	req->resp.an->event_actual = 0;
	402	req->resp.an->response = VIRTIO_SCSI_S_OK;
	403	}
	404	virtio_scsi_complete_req(req);
326799c0 SH	405	}
	406	}
	407
2ccdcd8d PB	408	static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
	409	size_t resid)
	410	{
	411	VirtIOSCSIReq *req = r->hba_private;
	412
	413	req->resp.cmd->response = VIRTIO_SCSI_S_OK;
	414	req->resp.cmd->status = status;
	415	if (req->resp.cmd->status == GOOD) {
	416	req->resp.cmd->resid = resid;
	417	} else {
	418	req->resp.cmd->resid = 0;
	419	req->resp.cmd->sense_len =
	420	scsi_req_get_sense(r, req->resp.cmd->sense, VIRTIO_SCSI_SENSE_SIZE);
	421	}
	422	virtio_scsi_complete_req(req);
	423	}
	424
	425	static QEMUSGList virtio_scsi_get_sg_list(SCSIRequest r)
	426	{
	427	VirtIOSCSIReq *req = r->hba_private;
	428
	429	return &req->qsgl;
	430	}
	431
	432	static void virtio_scsi_request_cancelled(SCSIRequest *r)
	433	{
	434	VirtIOSCSIReq *req = r->hba_private;
	435
	436	if (!req) {
	437	return;
	438	}
06114d72 PB	439	if (req->dev->resetting) {
	440	req->resp.cmd->response = VIRTIO_SCSI_S_RESET;
	441	} else {
	442	req->resp.cmd->response = VIRTIO_SCSI_S_ABORTED;
	443	}
2ccdcd8d PB	444	virtio_scsi_complete_req(req);
	445	}
	446
	447	static void virtio_scsi_fail_cmd_req(VirtIOSCSIReq *req)
326799c0 SH	448	{
	449	req->resp.cmd->response = VIRTIO_SCSI_S_FAILURE;
	450	virtio_scsi_complete_req(req);
973abc7f SH	451	}
	452
	453	static void virtio_scsi_handle_cmd(VirtIODevice vdev, VirtQueue vq)
	454	{
326799c0 SH	455	VirtIOSCSI s = (VirtIOSCSI )vdev;
326799c0 SH	456	VirtIOSCSIReq *req;
2ccdcd8d	457	int n;
326799c0 SH	458
326799c0 SH	459	while ((req = virtio_scsi_pop_req(s, vq))) {
2ccdcd8d	460	SCSIDevice *d;
326799c0 SH	461	int out_size, in_size;
	462	if (req->elem.out_num < 1 \|\| req->elem.in_num < 1) {
	463	virtio_scsi_bad_req();
	464	}
	465
	466	out_size = req->elem.out_sg[0].iov_len;
	467	in_size = req->elem.in_sg[0].iov_len;
	468	if (out_size < sizeof(VirtIOSCSICmdReq) + s->cdb_size \|\|
	469	in_size < sizeof(VirtIOSCSICmdResp) + s->sense_size) {
	470	virtio_scsi_bad_req();
	471	}
	472
	473	if (req->elem.out_num > 1 && req->elem.in_num > 1) {
2ccdcd8d	474	virtio_scsi_fail_cmd_req(req);
326799c0 SH	475	continue;
	476	}
	477
2ccdcd8d PB	478	d = virtio_scsi_device_find(s, req->req.cmd->lun);
	479	if (!d) {
	480	req->resp.cmd->response = VIRTIO_SCSI_S_BAD_TARGET;
	481	virtio_scsi_complete_req(req);
	482	continue;
	483	}
	484	req->sreq = scsi_req_new(d, req->req.cmd->tag,
	485	virtio_scsi_get_lun(req->req.cmd->lun),
	486	req->req.cmd->cdb, req);
	487
	488	if (req->sreq->cmd.mode != SCSI_XFER_NONE) {
	489	int req_mode =
	490	(req->elem.in_num > 1 ? SCSI_XFER_FROM_DEV : SCSI_XFER_TO_DEV);
	491
	492	if (req->sreq->cmd.mode != req_mode \|\|
	493	req->sreq->cmd.xfer > req->qsgl.size) {
	494	req->resp.cmd->response = VIRTIO_SCSI_S_OVERRUN;
	495	virtio_scsi_complete_req(req);
	496	continue;
	497	}
	498	}
	499
	500	n = scsi_req_enqueue(req->sreq);
	501	if (n) {
	502	scsi_req_continue(req->sreq);
	503	}
326799c0	504	}
973abc7f SH	505	}
	506
	507	static void virtio_scsi_get_config(VirtIODevice *vdev,
	508	uint8_t *config)
	509	{
	510	VirtIOSCSIConfig scsiconf = (VirtIOSCSIConfig )config;
	511	VirtIOSCSI s = (VirtIOSCSI )vdev;
	512
	513	stl_raw(&scsiconf->num_queues, s->conf->num_queues);
	514	stl_raw(&scsiconf->seg_max, 128 - 2);
	515	stl_raw(&scsiconf->max_sectors, s->conf->max_sectors);
	516	stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun);
	517	stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
	518	stl_raw(&scsiconf->sense_size, s->sense_size);
	519	stl_raw(&scsiconf->cdb_size, s->cdb_size);
	520	stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
	521	stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
	522	stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
	523	}
	524
	525	static void virtio_scsi_set_config(VirtIODevice *vdev,
	526	const uint8_t *config)
	527	{
	528	VirtIOSCSIConfig scsiconf = (VirtIOSCSIConfig )config;
	529	VirtIOSCSI s = (VirtIOSCSI )vdev;
	530
	531	if ((uint32_t) ldl_raw(&scsiconf->sense_size) >= 65536 \|\|
	532	(uint32_t) ldl_raw(&scsiconf->cdb_size) >= 256) {
	533	error_report("bad data written to virtio-scsi configuration space");
	534	exit(1);
	535	}
	536
	537	s->sense_size = ldl_raw(&scsiconf->sense_size);
	538	s->cdb_size = ldl_raw(&scsiconf->cdb_size);
	539	}
	540
	541	static uint32_t virtio_scsi_get_features(VirtIODevice *vdev,
	542	uint32_t requested_features)
	543	{
	544	return requested_features;
	545	}
	546
	547	static void virtio_scsi_reset(VirtIODevice *vdev)
	548	{
	549	VirtIOSCSI s = (VirtIOSCSI )vdev;
	550
	551	s->sense_size = VIRTIO_SCSI_SENSE_SIZE;
	552	s->cdb_size = VIRTIO_SCSI_CDB_SIZE;
	553	}
	554
5db1764c PB	555	/* The device does not have anything to save beyond the virtio data.
	556	* Request data is saved with callbacks from SCSI devices.
	557	*/
	558	static void virtio_scsi_save(QEMUFile f, void opaque)
	559	{
	560	VirtIOSCSI *s = opaque;
	561	virtio_save(&s->vdev, f);
	562	}
	563
	564	static int virtio_scsi_load(QEMUFile f, void opaque, int version_id)
	565	{
	566	VirtIOSCSI *s = opaque;
2a633c46 OW	567	int ret;
	568
	569	ret = virtio_load(&s->vdev, f);
	570	if (ret) {
	571	return ret;
	572	}
5db1764c PB	573	return 0;
	574	}
	575
2ccdcd8d PB	576	static struct SCSIBusInfo virtio_scsi_scsi_info = {
	577	.tcq = true,
	578	.max_channel = VIRTIO_SCSI_MAX_CHANNEL,
	579	.max_target = VIRTIO_SCSI_MAX_TARGET,
	580	.max_lun = VIRTIO_SCSI_MAX_LUN,
	581
	582	.complete = virtio_scsi_command_complete,
	583	.cancel = virtio_scsi_request_cancelled,
	584	.get_sg_list = virtio_scsi_get_sg_list,
5db1764c PB	585	.save_request = virtio_scsi_save_request,
5db1764c PB	586	.load_request = virtio_scsi_load_request,
2ccdcd8d PB	587	};
2ccdcd8d PB	588
973abc7f SH	589	VirtIODevice virtio_scsi_init(DeviceState dev, VirtIOSCSIConf *proxyconf)
	590	{
	591	VirtIOSCSI *s;
5db1764c	592	static int virtio_scsi_id;
d2ad7dd4 PB	593	size_t sz;
d2ad7dd4 PB	594	int i;
973abc7f	595
d2ad7dd4	596	sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *);
973abc7f	597	s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
d2ad7dd4	598	sizeof(VirtIOSCSIConfig), sz);
973abc7f SH	599
	600	s->qdev = dev;
	601	s->conf = proxyconf;
	602
	603	/* TODO set up vdev function pointers */
	604	s->vdev.get_config = virtio_scsi_get_config;
	605	s->vdev.set_config = virtio_scsi_set_config;
	606	s->vdev.get_features = virtio_scsi_get_features;
	607	s->vdev.reset = virtio_scsi_reset;
	608
	609	s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
	610	virtio_scsi_handle_ctrl);
	611	s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
	612	NULL);
d2ad7dd4 PB	613	for (i = 0; i < s->conf->num_queues; i++) {
	614	s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
	615	virtio_scsi_handle_cmd);
	616	}
973abc7f	617
2ccdcd8d PB	618	scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info);
	619	if (!dev->hotplugged) {
	620	scsi_bus_legacy_handle_cmdline(&s->bus);
	621	}
	622
5db1764c PB	623	register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
5db1764c PB	624	virtio_scsi_save, virtio_scsi_load, s);
973abc7f SH	625
	626	return &s->vdev;
	627	}
	628
	629	void virtio_scsi_exit(VirtIODevice *vdev)
	630	{
eb2fa764 PB	631	VirtIOSCSI s = (VirtIOSCSI )vdev;
eb2fa764 PB	632	unregister_savevm(s->qdev, "virtio-scsi", s);
973abc7f SH	633	virtio_cleanup(vdev);
973abc7f SH	634	}