svn commit: r265660 - stable/9/sys/cam/scsi

[Alexander Motin]

Author: mav
Date: Thu May  8 08:31:53 2014
New Revision: 265660
URL: http://svnweb.freebsd.org/changeset/base/265660

Log:
  MFC r265150:
  Do not reread SCSI disk VPD pages on every device open.
  
  Instead of rereading VPD pages on every device open, do it only on initial
  device probe, and in cases when device reported via UNIT ATTENTIONs that
  something has changed.  Capacity is still rereaded on every open because
  it is more critical for operation and more probable to change in run time.
  
  On my tests with Intel 530 SSDs on mps(4) HBA this change reduces time
  GEOM needs to retaste the device (that includes few open/close cycles)
  from ~150ms to ~30ms.

Modified:
  stable/9/sys/cam/scsi/scsi_da.c
Directory Properties:
  stable/9/   (props changed)
  stable/9/sys/   (props changed)

Modified: stable/9/sys/cam/scsi/scsi_da.c
==============================================================================
--- stable/9/sys/cam/scsi/scsi_da.c	Thu May  8 08:30:18 2014	(r265659)
+++ stable/9/sys/cam/scsi/scsi_da.c	Thu May  8 08:31:53 2014	(r265660)
@@ -90,7 +90,8 @@ typedef enum {
 	DA_FLAG_SCTX_INIT	= 0x200,
 	DA_FLAG_CAN_RC16	= 0x400,
 	DA_FLAG_PROBED		= 0x800,
-	DA_FLAG_DIRTY		= 0x1000
+	DA_FLAG_DIRTY		= 0x1000,
+	DA_FLAG_ANNOUNCED	= 0x2000
 } da_flags;
 
 typedef enum {
@@ -1675,10 +1676,18 @@ daasync(void *callback_arg, u_int32_t co
 		     &error_code, &sense_key, &asc, &ascq)) {
 			if (asc == 0x2A && ascq == 0x09) {
 				xpt_print(ccb->ccb_h.path,
-				    "capacity data has changed\n");
+				    "Capacity data has changed\n");
+				softc->flags &= ~DA_FLAG_PROBED;
 				dareprobe(periph);
-			} else if (asc == 0x28 && ascq == 0x00)
+			} else if (asc == 0x28 && ascq == 0x00) {
+				softc->flags &= ~DA_FLAG_PROBED;
 				disk_media_changed(softc->disk, M_NOWAIT);
+			} else if (asc == 0x3F && ascq == 0x03) {
+				xpt_print(ccb->ccb_h.path,
+				    "INQUIRY data has changed\n");
+				softc->flags &= ~DA_FLAG_PROBED;
+				dareprobe(periph);
+			}
 		}
 		cam_periph_async(periph, code, path, arg);
 		break;
@@ -1908,7 +1917,7 @@ daprobedone(struct cam_periph *periph, u
 
 	dadeletemethodchoose(softc, DA_DELETE_NONE);
 
-	if (bootverbose && (softc->flags & DA_FLAG_PROBED) == 0) {
+	if (bootverbose && (softc->flags & DA_FLAG_ANNOUNCED) == 0) {
 		char buf[80];
 		int i, sep;
 
@@ -1949,10 +1958,11 @@ daprobedone(struct cam_periph *periph, u
 	 */
 	xpt_release_ccb(ccb);
 	softc->state = DA_STATE_NORMAL;
+	softc->flags |= DA_FLAG_PROBED;
 	daschedule(periph);
 	wakeup(&softc->disk->d_mediasize);
-	if ((softc->flags & DA_FLAG_PROBED) == 0) {
-		softc->flags |= DA_FLAG_PROBED;
+	if ((softc->flags & DA_FLAG_ANNOUNCED) == 0) {
+		softc->flags |= DA_FLAG_ANNOUNCED;
 		cam_periph_unhold(periph);
 	} else
 		cam_periph_release_locked(periph);
@@ -3206,7 +3216,8 @@ dadone(struct cam_periph *periph, union 
 			}
 		}
 		free(csio->data_ptr, M_SCSIDA);
-		if (announce_buf[0] != '\0' && ((softc->flags & DA_FLAG_PROBED) == 0)) {
+		if (announce_buf[0] != '\0' &&
+		    ((softc->flags & DA_FLAG_ANNOUNCED) == 0)) {
 			/*
 			 * Create our sysctl variables, now that we know
 			 * we have successfully attached.
@@ -3224,6 +3235,12 @@ dadone(struct cam_periph *periph, union 
 			}
 		}
 
+		/* We already probed the device. */
+		if (softc->flags & DA_FLAG_PROBED) {
+			daprobedone(periph, done_ccb);
+			return;
+		}
+
 		/* Ensure re-probe doesn't see old delete. */
 		softc->delete_available = 0;
 		if (lbp && (softc->quirks & DA_Q_NO_UNMAP) == 0) {
@@ -3547,13 +3564,21 @@ daerror(union ccb *ccb, u_int32_t cam_fl
 		 */
 		else if (sense_key == SSD_KEY_UNIT_ATTENTION &&
 		    asc == 0x2A && ascq == 0x09) {
-			xpt_print(periph->path, "capacity data has changed\n");
+			xpt_print(periph->path, "Capacity data has changed\n");
+			softc->flags &= ~DA_FLAG_PROBED;
 			dareprobe(periph);
 			sense_flags |= SF_NO_PRINT;
 		} else if (sense_key == SSD_KEY_UNIT_ATTENTION &&
-		    asc == 0x28 && ascq == 0x00)
+		    asc == 0x28 && ascq == 0x00) {
+			softc->flags &= ~DA_FLAG_PROBED;
 			disk_media_changed(softc->disk, M_NOWAIT);
-		else if (sense_key == SSD_KEY_NOT_READY &&
+		} else if (sense_key == SSD_KEY_UNIT_ATTENTION &&
+		    asc == 0x3F && ascq == 0x03) {
+			xpt_print(periph->path, "INQUIRY data has changed\n");
+			softc->flags &= ~DA_FLAG_PROBED;
+			dareprobe(periph);
+			sense_flags |= SF_NO_PRINT;
+		} else if (sense_key == SSD_KEY_NOT_READY &&
 		    asc == 0x3a && (softc->flags & DA_FLAG_PACK_INVALID) == 0) {
 			softc->flags |= DA_FLAG_PACK_INVALID;
 			disk_media_gone(softc->disk, M_NOWAIT);