diff mbox series

[v6,22/35] scsi: Have scsi-ml retry sd_spinup_disk errors

Message ID 20221104231927.9613-23-michael.christie@oracle.com
State New
Headers show
Series Allow scsi_execute users to control retries | expand

Commit Message

Mike Christie Nov. 4, 2022, 11:19 p.m. UTC
This simplifies sd_spinup_disk so scsi-ml retries errors for it. Note that
we retried specifically on a UA and also if scsi_status_is_good returned
failed which would happen for all check conditions. In this patch we use
SCMD_FAILURE_STAT_ANY which will trigger for the same conditions as
when scsi_status_is_good returns false. This will cover all CCs including
UAs so there is no explicit failures arrary entry for UAs.

We do not handle the outside loop's retries because we want to sleep
between tried and we don't support that yet.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/sd.c | 93 +++++++++++++++++++++++++++--------------------
 1 file changed, 53 insertions(+), 40 deletions(-)

Comments

Bart Van Assche Nov. 9, 2022, 6:45 p.m. UTC | #1
On 11/4/22 16:19, Mike Christie wrote:
> This simplifies sd_spinup_disk so scsi-ml retries errors for it. Note that
> we retried specifically on a UA and also if scsi_status_is_good returned
> failed which would happen for all check conditions. In this patch we use
> SCMD_FAILURE_STAT_ANY which will trigger for the same conditions as
> when scsi_status_is_good returns false. This will cover all CCs including
> UAs so there is no explicit failures arrary entry for UAs.
> 
> We do not handle the outside loop's retries because we want to sleep
> between tried and we don't support that yet.

tried -> tries? Anyway:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
diff mbox series

Patch

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 54e599529a3c..66f1bc03e219 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2062,52 +2062,66 @@  static int sd_done(struct scsi_cmnd *SCpnt)
 static void
 sd_spinup_disk(struct scsi_disk *sdkp)
 {
-	unsigned char cmd[10];
+	static const u8 cmd[10] = { TEST_UNIT_READY };
 	unsigned long spintime_expire = 0;
-	int retries, spintime;
+	int spintime;
 	unsigned int the_result;
 	struct scsi_sense_hdr sshdr;
-	int sense_valid = 0;
+	int sense_valid = 0, i;
+	struct scsi_failure failures[] = {
+		/* Fail immediately for Medium Not Present */
+		{
+			.sense = UNIT_ATTENTION,
+			.asc = 0x3A,
+			.ascq = 0x0,
+			.allowed = 0,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.sense = NOT_READY,
+			.asc = 0x3A,
+			.ascq = 0x0,
+			.allowed = 0,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.result = SCMD_FAILURE_STAT_ANY,
+			.allowed = 3,
+		},
+		{},
+	};
 
 	spintime = 0;
 
 	/* Spin up drives, as required.  Only do this at boot time */
 	/* Spinup needs to be done for module loads too. */
 	do {
-		retries = 0;
-
-		do {
-			bool media_was_present = sdkp->media_present;
+		bool media_was_present = sdkp->media_present;
 
-			cmd[0] = TEST_UNIT_READY;
-			memset((void *) &cmd[1], 0, 9);
+		for (i = 0; i < ARRAY_SIZE(failures); i++)
+			failures[i].retries = 0;
 
-			the_result = scsi_exec_req(((struct scsi_exec_args) {
-							.sdev = sdkp->device,
-							.cmd = cmd,
-							.data_dir = DMA_NONE,
-							.sshdr = &sshdr,
-							.timeout = SD_TIMEOUT,
-							.retries = sdkp->max_retries }));
+		the_result = scsi_exec_req(((struct scsi_exec_args) {
+						.sdev = sdkp->device,
+						.cmd = cmd,
+						.data_dir = DMA_NONE,
+						.sshdr = &sshdr,
+						.timeout = SD_TIMEOUT,
+						.retries = sdkp->max_retries,
+						.failures = failures }));
 
-			/*
-			 * If the drive has indicated to us that it
-			 * doesn't have any media in it, don't bother
-			 * with any more polling.
-			 */
-			if (media_not_present(sdkp, &sshdr)) {
-				if (media_was_present)
-					sd_printk(KERN_NOTICE, sdkp, "Media removed, stopped polling\n");
-				return;
-			}
+		/*
+		 * If the drive has indicated to us that it doesn't have any
+		 * media in it, don't bother  with any more polling.
+		 */
+		if (media_not_present(sdkp, &sshdr)) {
+			if (media_was_present)
+				sd_printk(KERN_NOTICE, sdkp, "Media removed, stopped polling\n");
+			return;
+		}
 
-			if (the_result)
-				sense_valid = scsi_sense_valid(&sshdr);
-			retries++;
-		} while (retries < 3 &&
-			 (!scsi_status_is_good(the_result) ||
-			  (scsi_status_is_check_condition(the_result) &&
-			  sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
+		if (the_result)
+			sense_valid = scsi_sense_valid(&sshdr);
 
 		if (!scsi_status_is_check_condition(the_result)) {
 			/* no sense, TUR either succeeded or failed
@@ -2138,16 +2152,15 @@  sd_spinup_disk(struct scsi_disk *sdkp)
 			 * Issue command to spin up drive when not ready
 			 */
 			if (!spintime) {
+				/* Return immediately and start spin cycle */
+				const u8 start_cmd[10] = { START_STOP, 1, 0, 0,
+					sdkp->device->start_stop_pwr_cond ?
+					0x11 : 1 };
+
 				sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
-				cmd[0] = START_STOP;
-				cmd[1] = 1;	/* Return immediately */
-				memset((void *) &cmd[2], 0, 8);
-				cmd[4] = 1;	/* Start spin cycle */
-				if (sdkp->device->start_stop_pwr_cond)
-					cmd[4] |= 1 << 4;
 				scsi_exec_req(((struct scsi_exec_args) {
 						.sdev = sdkp->device,
-						.cmd = cmd,
+						.cmd = start_cmd,
 						.data_dir = DMA_NONE,
 						.sshdr = &sshdr,
 						.timeout = SD_TIMEOUT,