virtio-scsi: Add virtio-scsi stub device

Add a useless virtio SCSI HBA device:

  qemu -device virtio-scsi-pci

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 228 insertions, 0 deletions

diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
new file mode 100644
index 0000000000..a297fedd03
--- /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);
+}