If the adapter is busy, return the request to the midlayer rather than
queueing it in the driver. asc_execute_queue() and asc_dequeue() become
unused, and we don't need to print out stats on the waiting queue any more.
Signed-off-by: Matthew Wilcox <matthew@xxxxxx>
---
drivers/scsi/advansys.c | 186 ++--------------------------------------------
1 files changed, 9 insertions(+), 177 deletions(-)
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
index fe289b1..526239a 100644
--- a/drivers/scsi/advansys.c
+++ b/drivers/scsi/advansys.c
@@ -2852,7 +2852,6 @@ typedef struct asc_board {
} dvc_cfg;
ushort asc_n_io_port; /* Number I/O ports. */
asc_queue_t active; /* Active command queue */
- asc_queue_t waiting; /* Waiting command queue */
asc_queue_t done; /* Done command queue */
ADV_SCSI_BIT_ID_TYPE init_tidmask; /* Target init./valid mask */
struct scsi_device *device[ADV_MAX_TID + 1]; /* Mid-Level Scsi Device */
@@ -2922,10 +2921,8 @@ static int asc_build_req(asc_board_t *, struct scsi_cmnd *);
static int adv_build_req(asc_board_t *, struct scsi_cmnd *, ADV_SCSI_REQ_Q **);
static int adv_get_sglist(asc_board_t *, adv_req_t *, struct scsi_cmnd *, int);
static void asc_enqueue(asc_queue_t *, REQP, int);
-static REQP asc_dequeue(asc_queue_t *, int);
static REQP asc_dequeue_list(asc_queue_t *, REQP *, int);
static int asc_rmqueue(asc_queue_t *, REQP);
-static void asc_execute_queue(asc_queue_t *);
#ifdef CONFIG_PROC_FS
static int asc_proc_copy(off_t, off_t, char *, int, char *, int);
static int asc_prt_board_devices(struct Scsi_Host *, char *, int);
@@ -3274,6 +3271,7 @@ advansys_queuecommand(struct scsi_cmnd *scp, void (*done) (struct scsi_cmnd *))
asc_board_t *boardp;
ulong flags;
struct scsi_cmnd *done_scp;
+ int asc_res, result = 0;
shost = scp->device->host;
boardp = ASC_BOARDP(shost);
@@ -3302,37 +3300,13 @@ advansys_queuecommand(struct scsi_cmnd *scp, void (*done) (struct scsi_cmnd *))
return 0;
}
- /*
- * Attempt to execute any waiting commands for the board.
- */
- if (!ASC_QUEUE_EMPTY(&boardp->waiting)) {
- ASC_DBG(1,
- "advansys_queuecommand: before asc_execute_queue() waiting\n");
- asc_execute_queue(&boardp->waiting);
- }
-
- /*
- * Save the function pointer to Linux mid-level 'done' function
- * and attempt to execute the command.
- *
- * If ASC_NOERROR is returned the request has been added to the
- * board's 'active' queue and will be completed by the interrupt
- * handler.
- *
- * If ASC_BUSY is returned add the request to the board's per
- * target waiting list. This is the first time the request has
- * been tried. Add it to the back of the waiting list. It will be
- * retried later.
- *
- * If an error occurred, the request will have been placed on the
- * board's 'done' queue and must be completed before returning.
- */
scp->scsi_done = done;
- switch (asc_execute_scsi_cmnd(scp)) {
+ asc_res = asc_execute_scsi_cmnd(scp);
+ switch (asc_res) {
case ASC_NOERROR:
break;
case ASC_BUSY:
- asc_enqueue(&boardp->waiting, scp, ASC_BACK);
+ result = SCSI_MLQUEUE_HOST_BUSY;
break;
case ASC_ERROR:
default:
@@ -3343,7 +3317,7 @@ advansys_queuecommand(struct scsi_cmnd *scp, void (*done) (struct scsi_cmnd *))
}
spin_unlock_irqrestore(&boardp->lock, flags);
- return 0;
+ return result;
}
/*
@@ -3488,33 +3462,6 @@ static int advansys_reset(struct scsi_cmnd *scp)
}
}
- /*
- * Dequeue all 'waiting' requests and set the request status
- * to DID_RESET.
- */
- if (done_scp == NULL) {
- done_scp = asc_dequeue_list(&boardp->waiting, &last_scp,
- ASC_TID_ALL);
- for (tscp = done_scp; tscp; tscp = REQPNEXT(tscp)) {
- tscp->result = HOST_BYTE(DID_RESET);
- }
- } else {
- /* Append to 'done_scp' at the end with 'last_scp'. */
- ASC_ASSERT(last_scp != NULL);
- last_scp->host_scribble =
- (unsigned char *)asc_dequeue_list(&boardp->waiting,
- &new_last_scp,
- ASC_TID_ALL);
- if (new_last_scp != NULL) {
- ASC_ASSERT(REQPNEXT(last_scp) != NULL);
- for (tscp = REQPNEXT(last_scp); tscp;
- tscp = REQPNEXT(tscp)) {
- tscp->result = HOST_BYTE(DID_RESET);
- }
- last_scp = new_last_scp;
- }
- }
-
/* Save the time of the most recently completed reset. */
boardp->last_reset = jiffies;
@@ -3650,7 +3597,7 @@ static irqreturn_t advansys_interrupt(int irq, void *dev_id)
}
/*
- * Start waiting requests and create a list of completed requests.
+ * Create a list of completed requests.
*
* If a reset request is being performed for the board, the reset
* handler will complete pending requests after it has completed.
@@ -3659,13 +3606,6 @@ static irqreturn_t advansys_interrupt(int irq, void *dev_id)
ASC_DBG2(1, "advansys_interrupt: done_scp 0x%p, "
"last_scp 0x%p\n", done_scp, last_scp);
- /* Start any waiting commands for the board. */
- if (!ASC_QUEUE_EMPTY(&boardp->waiting)) {
- ASC_DBG(1, "advansys_interrupt: before "
- "asc_execute_queue()\n");
- asc_execute_queue(&boardp->waiting);
- }
-
/*
* Add to the list of requests that must be completed.
*
@@ -3986,8 +3926,8 @@ static void asc_scsi_done_list(struct scsi_cmnd *scp)
* If this function returns ASC_NOERROR the request has been enqueued
* on the board's 'done' queue and must be completed by the caller.
*
- * If ASC_BUSY is returned the request will be enqueued by the
- * caller on the target's waiting queue and re-tried later.
+ * If ASC_BUSY is returned the request will be returned to the midlayer
+ * and re-tried later.
*/
static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
{
@@ -4043,10 +3983,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
"ASC_NOERROR\n");
break;
case ASC_BUSY:
- /*
- * Caller will enqueue request on the target's waiting
- * queue and retry later.
- */
ASC_STATS(scp->device->host, exe_busy);
break;
case ASC_ERROR:
@@ -4087,10 +4023,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
ASC_DBG(1, "asc_execute_scsi_cmnd: adv_build_req "
"ASC_BUSY\n");
/*
- * If busy is returned the request has not been
- * enqueued. It will be enqueued by the caller on the
- * target's waiting queue and retried later.
- *
* The asc_stats fields 'adv_build_noreq' and
* 'adv_build_nosg' count wide board busy conditions.
* They are updated in adv_build_req and
@@ -4127,10 +4059,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
"ASC_NOERROR\n");
break;
case ASC_BUSY:
- /*
- * Caller will enqueue request on the target's waiting
- * queue and retry later.
- */
ASC_STATS(scp->device->host, exe_busy);
break;
case ASC_ERROR:
@@ -5005,39 +4933,6 @@ static void asc_enqueue(asc_queue_t *ascq, REQP reqp, int flag)
}
/*
- * Return first queued 'REQP' on the specified queue for
- * the specified target device. Clear the 'tidmask' bit for
- * the device if no more commands are left queued for it.
- *
- * 'REQPNEXT(reqp)' returns reqp's next pointer.
- */
-static REQP asc_dequeue(asc_queue_t *ascq, int tid)
-{
- REQP reqp;
-
- ASC_DBG2(3, "asc_dequeue: ascq 0x%lx, tid %d\n", (ulong)ascq, tid);
- ASC_ASSERT(tid >= 0 && tid <= ADV_MAX_TID);
- if ((reqp = ascq->q_first[tid]) != NULL) {
- ASC_ASSERT(ascq->q_tidmask & ADV_TID_TO_TIDMASK(tid));
- ascq->q_first[tid] = REQPNEXT(reqp);
- /* If the queue is empty, clear its bit and the last pointer. */
- if (ascq->q_first[tid] == NULL) {
- ascq->q_tidmask &= ~ADV_TID_TO_TIDMASK(tid);
- ASC_ASSERT(ascq->q_last[tid] == reqp);
- ascq->q_last[tid] = NULL;
- }
-#ifdef ADVANSYS_STATS
- /* Maintain request queue statistics. */
- ascq->q_cur_cnt[tid]--;
- ASC_ASSERT(ascq->q_cur_cnt[tid] >= 0);
- REQTIMESTAT("asc_dequeue", ascq, reqp, tid);
-#endif /* ADVANSYS_STATS */
- }
- ASC_DBG1(3, "asc_dequeue: reqp 0x%lx\n", (ulong)reqp);
- return reqp;
-}
-
-/*
* Return a pointer to a singly linked list of all the requests queued
* for 'tid' on the 'asc_queue_t' pointed to by 'ascq'.
*
@@ -5202,45 +5097,6 @@ static int asc_rmqueue(asc_queue_t *ascq, REQP reqp)
return ret;
}
-/*
- * Execute as many queued requests as possible for the specified queue.
- *
- * Calls asc_execute_scsi_cmnd() to execute a REQP/struct scsi_cmnd.
- */
-static void asc_execute_queue(asc_queue_t *ascq)
-{
- ADV_SCSI_BIT_ID_TYPE scan_tidmask;
- REQP reqp;
- int i;
-
- ASC_DBG1(1, "asc_execute_queue: ascq 0x%lx\n", (ulong)ascq);
- /*
- * Execute queued commands for devices attached to
- * the current board in round-robin fashion.
- */
- scan_tidmask = ascq->q_tidmask;
- do {
- for (i = 0; i <= ADV_MAX_TID; i++) {
- if (scan_tidmask & ADV_TID_TO_TIDMASK(i)) {
- if ((reqp = asc_dequeue(ascq, i)) == NULL) {
- scan_tidmask &= ~ADV_TID_TO_TIDMASK(i);
- } else
- if (asc_execute_scsi_cmnd
- ((struct scsi_cmnd *)reqp)
- == ASC_BUSY) {
- scan_tidmask &= ~ADV_TID_TO_TIDMASK(i);
- /*
- * The request returned ASC_BUSY. Enqueue at the front of
- * target's waiting list to maintain correct ordering.
- */
- asc_enqueue(ascq, reqp, ASC_FRONT);
- }
- }
- }
- } while (scan_tidmask);
- return;
-}
-
#ifdef CONFIG_PROC_FS
/*
* asc_prt_board_devices()
@@ -6723,7 +6579,6 @@ asc_prt_target_stats(struct Scsi_Host *shost, int tgt_id, char *cp, int cplen)
ushort chip_scsi_id;
asc_board_t *boardp;
asc_queue_t *active;
- asc_queue_t *waiting;
leftlen = cplen;
totlen = len = 0;
@@ -6732,7 +6587,6 @@ asc_prt_target_stats(struct Scsi_Host *shost, int tgt_id, char *cp, int cplen)
s = &boardp->asc_stats;
active = &ASC_BOARDP(shost)->active;
- waiting = &ASC_BOARDP(shost)->waiting;
if (ASC_NARROW_BOARD(boardp)) {
chip_scsi_id = boardp->dvc_cfg.asc_dvc_cfg.chip_scsi_id;
@@ -6746,8 +6600,7 @@ asc_prt_target_stats(struct Scsi_Host *shost, int tgt_id, char *cp, int cplen)
}
do {
- if (active->q_tot_cnt[tgt_id] > 0
- || waiting->q_tot_cnt[tgt_id] > 0) {
+ if (active->q_tot_cnt[tgt_id] > 0) {
len = asc_prt_line(cp, leftlen, " target %d\n", tgt_id);
ASC_PRT_NEXT();
@@ -6771,27 +6624,6 @@ asc_prt_target_stats(struct Scsi_Host *shost, int tgt_id, char *cp, int cplen)
q_tot_cnt
[tgt_id]));
ASC_PRT_NEXT();
-
- len = asc_prt_line(cp, leftlen,
- " waiting: cnt [cur %d, max %d, tot %u], time [min %u, max %u, avg %lu.%01lu]\n",
- waiting->q_cur_cnt[tgt_id],
- waiting->q_max_cnt[tgt_id],
- waiting->q_tot_cnt[tgt_id],
- waiting->q_min_tim[tgt_id],
- waiting->q_max_tim[tgt_id],
- (waiting->q_tot_cnt[tgt_id] ==
- 0) ? 0 : (waiting->
- q_tot_tim[tgt_id] /
- waiting->
- q_tot_cnt[tgt_id]),
- (waiting->q_tot_cnt[tgt_id] ==
- 0) ? 0 : ASC_TENTHS(waiting->
- q_tot_tim
- [tgt_id],
- waiting->
- q_tot_cnt
- [tgt_id]));
- ASC_PRT_NEXT();
}
} while (0);
--
1.5.2.4
-
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