scsi: push request restart to SCSIDevice
The request restart mechanism is generic and could be reused for
scsi-generic. In the meanwhile, pushing it to SCSIDevice avoids
that scsi_dma_restart_bh looks at SCSIGenericReqs when working on
a scsi-block device.
The code is the same that is already in hw/scsi-disk.c, with
the type flags replaced by req->cmd.mode and a more generic way to
requeue SCSI_XFER_NONE commands.
I also added a missing call to qemu_del_vm_change_state_handler.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index bb07737..352d41f 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -42,12 +42,6 @@
#define SCSI_DMA_BUF_SIZE 131072
#define SCSI_MAX_INQUIRY_LEN 256
-#define SCSI_REQ_STATUS_RETRY 0x01
-#define SCSI_REQ_STATUS_RETRY_TYPE_MASK 0x06
-#define SCSI_REQ_STATUS_RETRY_READ 0x00
-#define SCSI_REQ_STATUS_RETRY_WRITE 0x02
-#define SCSI_REQ_STATUS_RETRY_FLUSH 0x04
-
typedef struct SCSIDiskState SCSIDiskState;
typedef struct SCSIDiskReq {
@@ -58,7 +52,6 @@
uint32_t buflen;
struct iovec iov;
QEMUIOVector qiov;
- uint32_t status;
BlockAcctCookie acct;
} SCSIDiskReq;
@@ -75,8 +68,7 @@
bool tray_locked;
};
-static int scsi_handle_rw_error(SCSIDiskReq *r, int error, int type);
-static int32_t scsi_send_command(SCSIRequest *req, uint8_t *buf);
+static int scsi_handle_rw_error(SCSIDiskReq *r, int error);
static void scsi_free_request(SCSIRequest *req)
{
@@ -102,7 +94,6 @@
SCSIDiskReq *r = DO_UPCAST(SCSIDiskReq, req, req);
DPRINTF("Cancel tag=0x%x\n", req->tag);
- r->status &= ~(SCSI_REQ_STATUS_RETRY | SCSI_REQ_STATUS_RETRY_TYPE_MASK);
if (r->req.aiocb) {
bdrv_aio_cancel(r->req.aiocb);
@@ -139,7 +130,7 @@
}
if (ret) {
- if (scsi_handle_rw_error(r, -ret, SCSI_REQ_STATUS_RETRY_READ)) {
+ if (scsi_handle_rw_error(r, -ret)) {
goto done;
}
}
@@ -168,7 +159,7 @@
}
if (ret < 0) {
- if (scsi_handle_rw_error(r, -ret, SCSI_REQ_STATUS_RETRY_FLUSH)) {
+ if (scsi_handle_rw_error(r, -ret)) {
goto done;
}
}
@@ -233,9 +224,9 @@
* scsi_handle_rw_error always manages its reference counts, independent
* of the return value.
*/
-static int scsi_handle_rw_error(SCSIDiskReq *r, int error, int type)
+static int scsi_handle_rw_error(SCSIDiskReq *r, int error)
{
- int is_read = (type == SCSI_REQ_STATUS_RETRY_READ);
+ int is_read = (r->req.cmd.xfer == SCSI_XFER_FROM_DEV);
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
BlockErrorAction action = bdrv_get_on_error(s->qdev.conf.bs, is_read);
@@ -247,17 +238,10 @@
if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC)
|| action == BLOCK_ERR_STOP_ANY) {
- type &= SCSI_REQ_STATUS_RETRY_TYPE_MASK;
- r->status |= SCSI_REQ_STATUS_RETRY | type;
-
bdrv_mon_event(s->qdev.conf.bs, BDRV_ACTION_STOP, is_read);
vm_stop(RUN_STATE_IO_ERROR);
bdrv_iostatus_set_err(s->qdev.conf.bs, error);
-
- /* No need to save a reference, because scsi_dma_restart_bh just
- * looks at the request list. If a request is canceled, the
- * retry request is just dropped.
- */
+ scsi_req_retry(&r->req);
} else {
switch (error) {
case ENOMEDIUM:
@@ -290,7 +274,7 @@
}
if (ret) {
- if (scsi_handle_rw_error(r, -ret, SCSI_REQ_STATUS_RETRY_WRITE)) {
+ if (scsi_handle_rw_error(r, -ret)) {
goto done;
}
}
@@ -347,51 +331,6 @@
}
}
-static void scsi_dma_restart_bh(void *opaque)
-{
- SCSIDiskState *s = opaque;
- SCSIRequest *req;
- SCSIDiskReq *r;
-
- qemu_bh_delete(s->bh);
- s->bh = NULL;
-
- QTAILQ_FOREACH(req, &s->qdev.requests, next) {
- r = DO_UPCAST(SCSIDiskReq, req, req);
- if (r->status & SCSI_REQ_STATUS_RETRY) {
- int status = r->status;
-
- r->status &=
- ~(SCSI_REQ_STATUS_RETRY | SCSI_REQ_STATUS_RETRY_TYPE_MASK);
-
- switch (status & SCSI_REQ_STATUS_RETRY_TYPE_MASK) {
- case SCSI_REQ_STATUS_RETRY_READ:
- scsi_read_data(&r->req);
- break;
- case SCSI_REQ_STATUS_RETRY_WRITE:
- scsi_write_data(&r->req);
- break;
- case SCSI_REQ_STATUS_RETRY_FLUSH:
- scsi_send_command(&r->req, r->req.cmd.buf);
- break;
- }
- }
- }
-}
-
-static void scsi_dma_restart_cb(void *opaque, int running, RunState state)
-{
- SCSIDiskState *s = opaque;
-
- if (!running) {
- return;
- }
- if (!s->bh) {
- s->bh = qemu_bh_new(scsi_dma_restart_bh, s);
- qemu_bh_schedule(s->bh);
- }
-}
-
/* Return a pointer to the data buffer. */
static uint8_t *scsi_get_buf(SCSIRequest *req)
{
@@ -1591,7 +1530,6 @@
}
bdrv_set_buffer_alignment(s->qdev.conf.bs, s->qdev.blocksize);
- qemu_add_vm_change_state_handler(scsi_dma_restart_cb, s);
bdrv_iostatus_enable(s->qdev.conf.bs);
add_boot_device_path(s->qdev.conf.bootindex, &dev->qdev, ",0");
return 0;
