Real SCSI device passthrough (v4), by Laurent Vivier.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3851 c046a42c-6fe2-441c-8c8c-71466251a162

Makefile

@@ -56,6 +56,7 @@ OBJS+=irq.o
 OBJS+=i2c.o smbus.o smbus_eeprom.o max7310.o max111x.o wm8750.o
 OBJS+=ssd0303.o ssd0323.o ads7846.o stellaris_input.o
 OBJS+=scsi-disk.o cdrom.o
+OBJS+=scsi-generic.o
 OBJS+=usb.o usb-hub.o usb-linux.o usb-hid.o usb-msd.o usb-wacom.o
 OBJS+=sd.o ssi-sd.o
 

block-raw-posix.c

@@ -151,7 +151,7 @@ static int raw_pread(BlockDriverState *bs, int64_t offset,
     if (ret < 0)
         return ret;
 
-    if (lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
+    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
         ++(s->lseek_err_cnt);
         if(s->lseek_err_cnt <= 10) {
             DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
@@ -204,7 +204,7 @@ static int raw_pwrite(BlockDriverState *bs, int64_t offset,
     if (ret < 0)
         return ret;
 
-    if (lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
+    if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
         ++(s->lseek_err_cnt);
         if(s->lseek_err_cnt) {
             DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
@@ -276,8 +276,8 @@ void qemu_aio_init(void)
            seems to fix the problem. */
         struct aioinit ai;
         memset(&ai, 0, sizeof(ai));
-        ai.aio_threads = 1;
-        ai.aio_num = 1;
+        ai.aio_threads = 16;
+        ai.aio_num = 16;
         ai.aio_idle_time = 365 * 100000;
         aio_init(&ai);
     }
@@ -387,7 +387,10 @@ static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
     acb->aiocb.aio_sigevent.sigev_signo = aio_sig_num;
     acb->aiocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
     acb->aiocb.aio_buf = buf;
-    acb->aiocb.aio_nbytes = nb_sectors * 512;
+    if (nb_sectors < 0)
+        acb->aiocb.aio_nbytes = -nb_sectors;
+    else
+        acb->aiocb.aio_nbytes = nb_sectors * 512;
     acb->aiocb.aio_offset = sector_num * 512;
     acb->next = first_aio;
     first_aio = acb;
@@ -679,6 +682,8 @@ static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
         s->fd_open_flags = open_flags;
         /* open will not fail even if no floppy is inserted */
         open_flags |= O_NONBLOCK;
+    } else if (strstart(filename, "/dev/sg", NULL)) {
+        bs->sg = 1;
     }
 #endif
     fd = open(filename, open_flags, 0644);
@@ -858,6 +863,12 @@ static int raw_set_locked(BlockDriverState *bs, int locked)
     return 0;
 }
 
+static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+    BDRVRawState *s = bs->opaque;
+
+    return ioctl(s->fd, req, buf);
+}
 #else
 
 static int raw_is_inserted(BlockDriverState *bs)
@@ -880,6 +891,10 @@ static int raw_set_locked(BlockDriverState *bs, int locked)
     return -ENOTSUP;
 }
 
+static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+    return -ENOTSUP;
+}
 #endif /* !linux */
 
 BlockDriver bdrv_host_device = {
@@ -906,4 +921,6 @@ BlockDriver bdrv_host_device = {
     .bdrv_media_changed = raw_media_changed,
     .bdrv_eject = raw_eject,
     .bdrv_set_locked = raw_set_locked,
+    /* generic scsi device */
+    .bdrv_ioctl = raw_ioctl,
 };

block.c

@@ -786,6 +786,11 @@ int bdrv_is_read_only(BlockDriverState *bs)
     return bs->read_only;
 }
 
+int bdrv_is_sg(BlockDriverState *bs)
+{
+    return bs->sg;
+}
+
 /* XXX: no longer used */
 void bdrv_set_change_cb(BlockDriverState *bs,
                         void (*change_cb)(void *opaque), void *opaque)
@@ -1394,3 +1399,14 @@ void bdrv_set_locked(BlockDriverState *bs, int locked)
         drv->bdrv_set_locked(bs, locked);
     }
 }
+
+/* needed for generic scsi interface */
+
+int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+    BlockDriver *drv = bs->drv;
+
+    if (drv && drv->bdrv_ioctl)
+        return drv->bdrv_ioctl(bs, req, buf);
+    return -ENOTSUP;
+}

block.h

@@ -119,6 +119,7 @@ int bdrv_get_type_hint(BlockDriverState *bs);
 int bdrv_get_translation_hint(BlockDriverState *bs);
 int bdrv_is_removable(BlockDriverState *bs);
 int bdrv_is_read_only(BlockDriverState *bs);
+int bdrv_is_sg(BlockDriverState *bs);
 int bdrv_is_inserted(BlockDriverState *bs);
 int bdrv_media_changed(BlockDriverState *bs);
 int bdrv_is_locked(BlockDriverState *bs);
@@ -148,6 +149,7 @@ int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
 int bdrv_snapshot_list(BlockDriverState *bs,
                        QEMUSnapshotInfo **psn_info);
 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
+int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
 
 char *get_human_readable_size(char *buf, int buf_size, int64_t size);
 int path_is_absolute(const char *path);

block_int.h

@@ -82,6 +82,9 @@ struct BlockDriver {
     int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
     int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
 
+    /* to control generic scsi devices */
+    int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
+
     BlockDriverAIOCB *free_aiocb;
     struct BlockDriver *next;
 };
@@ -93,6 +96,7 @@ struct BlockDriverState {
     int removable; /* if true, the media can be removed */
     int locked;    /* if true, the media cannot temporarily be ejected */
     int encrypted; /* if true, the media is encrypted */
+    int sg;        /* if true, the device is a /dev/sg* */
     /* event callback when inserting/removing */
     void (*change_cb)(void *opaque);
     void *change_opaque;

hw/esp.c

@@ -615,7 +615,9 @@ void esp_scsi_attach(void *opaque, BlockDriverState *bd, int id)
     }
     DPRINTF("Attaching block device %d\n", id);
     /* Command queueing is not implemented.  */
-    s->scsi_dev[id] = scsi_disk_init(bd, 0, esp_command_complete, s);
+    s->scsi_dev[id] = scsi_generic_init(bd, 0, esp_command_complete, s);
+    if (s->scsi_dev[id] == NULL)
+        s->scsi_dev[id] = scsi_disk_init(bd, 0, esp_command_complete, s);
 }
 
 void *esp_init(target_phys_addr_t espaddr,

hw/lsi53c895a.c

@@ -1236,6 +1236,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset)
         return s->sdid;
     case 0x07: /* GPREG0 */
         return 0x7f;
+    case 0x08: /* Revision ID */
+        return 0x00;
     case 0xa: /* SSID */
         return s->ssid;
     case 0xb: /* SBCL */
@@ -1281,6 +1283,8 @@ static uint8_t lsi_reg_readb(LSIState *s, int offset)
         return s->ctest4;
     case 0x22: /* CTEST5 */
         return s->ctest5;
+    case 0x23: /* CTEST6 */
+         return 0;
     case 0x24: /* DBC[0:7] */
         return s->dbc & 0xff;
     case 0x25: /* DBC[8:15] */
@@ -1838,7 +1842,9 @@ void lsi_scsi_attach(void *opaque, BlockDriverState *bd, int id)
         s->scsi_dev[id]->destroy(s->scsi_dev[id]);
     }
     DPRINTF("Attaching block device %d\n", id);
-    s->scsi_dev[id] = scsi_disk_init(bd, 1, lsi_command_complete, s);
+    s->scsi_dev[id] = scsi_generic_init(bd, 1, lsi_command_complete, s);
+    if (s->scsi_dev[id] == NULL)
+        s->scsi_dev[id] = scsi_disk_init(bd, 1, lsi_command_complete, s);
 }
 
 void *lsi_scsi_init(PCIBus *bus, int devfn)

hw/scsi-disk.h

@@ -26,6 +26,8 @@ struct SCSIDevice
 
 SCSIDevice *scsi_disk_init(BlockDriverState *bdrv, int tcq,
                            scsi_completionfn completion, void *opaque);
+SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,
+                           scsi_completionfn completion, void *opaque);
 
 /* cdrom.c */
 int cdrom_read_toc(int nb_sectors, uint8_t *buf, int msf, int start_track);