All of lore.kernel.org
 help / color / mirror / Atom feed
From: Douglas Gilbert <dgilbert@interlog.com>
To: linux-scsi@vger.kernel.org
Cc: martin.petersen@oracle.com, jejb@linux.vnet.ibm.com, hare@suse.de
Subject: [PATCH v5 5/9] scsi_error: use xarray lookup instead of wrappers
Date: Sun, 19 Jul 2020 22:57:38 -0400	[thread overview]
Message-ID: <20200720025742.349296-6-dgilbert@interlog.com> (raw)
In-Reply-To: <20200720025742.349296-1-dgilbert@interlog.com>

From: Hannes Reinecke <hare@suse.de>

For SCSI EH most shost_for_each_sdev() calls are just to filter
out devices for specific targets or channels.
These calls can be made more efficient using direct xarray
lookup and iterators.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
---
 drivers/scsi/scsi.c       |  2 +-
 drivers/scsi/scsi_error.c | 35 ++++++++++++++++++++++-------------
 drivers/scsi/scsi_priv.h  |  2 ++
 3 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 6a1d8c6bd8f9..296cecd61d3a 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -652,7 +652,7 @@ EXPORT_SYMBOL(__scsi_iterate_devices_unlocked);
  * @id:		ID of the target
  *
  */
-static struct scsi_target *__scsi_target_lookup(struct Scsi_Host *shost,
+struct scsi_target *__scsi_target_lookup(struct Scsi_Host *shost,
 					 u16 channel, u16 id)
 {
 	return xa_load(&shost->__targets, (channel << 16) | id);
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 927b1e641842..02605c848365 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -643,7 +643,9 @@ EXPORT_SYMBOL_GPL(scsi_check_sense);
 static void scsi_handle_queue_ramp_up(struct scsi_device *sdev)
 {
 	struct scsi_host_template *sht = sdev->host->hostt;
+	struct scsi_target *starget;
 	struct scsi_device *tmp_sdev;
+	unsigned long lun_idx = 0;
 
 	if (!sht->track_queue_depth ||
 	    sdev->queue_depth >= sdev->max_queue_depth)
@@ -661,10 +663,9 @@ static void scsi_handle_queue_ramp_up(struct scsi_device *sdev)
 	 * Walk all devices of a target and do
 	 * ramp up on them.
 	 */
-	shost_for_each_device(tmp_sdev, sdev->host) {
-		if (tmp_sdev->channel != sdev->channel ||
-		    tmp_sdev->id != sdev->id ||
-		    tmp_sdev->queue_depth == sdev->max_queue_depth)
+	starget = __scsi_target_lookup(sdev->host, sdev->channel, sdev->id);
+	xa_for_each(&starget->__devices, lun_idx, tmp_sdev) {
+		if (tmp_sdev->queue_depth == sdev->max_queue_depth)
 			continue;
 
 		scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1);
@@ -675,14 +676,15 @@ static void scsi_handle_queue_ramp_up(struct scsi_device *sdev)
 static void scsi_handle_queue_full(struct scsi_device *sdev)
 {
 	struct scsi_host_template *sht = sdev->host->hostt;
+	struct scsi_target *starget = sdev->sdev_target;
 	struct scsi_device *tmp_sdev;
+	unsigned long lun_idx = 0;
 
 	if (!sht->track_queue_depth)
 		return;
 
-	shost_for_each_device(tmp_sdev, sdev->host) {
-		if (tmp_sdev->channel != sdev->channel ||
-		    tmp_sdev->id != sdev->id)
+	xa_for_each(&starget->__devices, lun_idx, tmp_sdev) {
+		if (tmp_sdev->sdev_state == SDEV_DEL)
 			continue;
 		/*
 		 * We do not know the number of commands that were at
@@ -2273,10 +2275,16 @@ int scsi_error_handler(void *data)
  */
 void scsi_report_bus_reset(struct Scsi_Host *shost, int channel)
 {
+	struct scsi_target *starget;
 	struct scsi_device *sdev;
+	unsigned long tid = 0;
 
-	__shost_for_each_device(sdev, shost) {
-		if (channel == sdev_channel(sdev))
+	xa_for_each(&shost->__targets, tid, starget) {
+		unsigned long lun_idx = 0;
+
+		if (starget->channel != channel)
+			continue;
+		xa_for_each(&starget->__devices, lun_idx, sdev)
 			__scsi_report_device_reset(sdev, NULL);
 	}
 }
@@ -2306,13 +2314,14 @@ EXPORT_SYMBOL(scsi_report_bus_reset);
  */
 void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target)
 {
+	struct scsi_target *starget;
 	struct scsi_device *sdev;
+	unsigned long lun_idx = 0;
 
-	__shost_for_each_device(sdev, shost) {
-		if (channel == sdev_channel(sdev) &&
-		    target == sdev_id(sdev))
+	starget = __scsi_target_lookup(shost, channel, target);
+	if (starget)
+		xa_for_each(&starget->__devices, lun_idx, sdev)
 			__scsi_report_device_reset(sdev, NULL);
-	}
 }
 EXPORT_SYMBOL(scsi_report_device_reset);
 
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 22b6585e28b4..0a87c95359aa 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -49,6 +49,8 @@ enum scsi_devinfo_key {
 	SCSI_DEVINFO_SPI,
 };
 
+extern struct scsi_target *__scsi_target_lookup(struct Scsi_Host *shost,
+						u16 channel, u16 id);
 extern blist_flags_t scsi_get_device_flags(struct scsi_device *sdev,
 					   const unsigned char *vendor,
 					   const unsigned char *model);
-- 
2.25.1


  parent reply	other threads:[~2020-07-20  2:57 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-20  2:57 [PATCH v5 0/9] scsi: use xarray for devices and targets Douglas Gilbert
2020-07-20  2:57 ` [PATCH v5 1/9] scsi: convert target lookup to xarray Douglas Gilbert
2020-07-20  2:57 ` [PATCH v5 2/9] target_core_pscsi: use __scsi_device_lookup() Douglas Gilbert
2020-07-20  2:57 ` [PATCH v5 3/9] scsi: move target device list to xarray Douglas Gilbert
2020-07-20  2:57 ` [PATCH v5 4/9] scsi: remove direct device lookup per host Douglas Gilbert
2020-07-20  2:57 ` Douglas Gilbert [this message]
2020-07-20  2:57 ` [PATCH v5 6/9] scsi: avoid pointless memory allocation in scsi_alloc_target() Douglas Gilbert
2020-07-20  2:57 ` [PATCH v5 7/9] scsi: add starget_to_shost() specialization Douglas Gilbert
2020-07-20  2:57 ` [PATCH v5 8/9] scsi: simplify scsi_target() inline Douglas Gilbert
2020-07-20  2:57 ` [PATCH v5 9/9] scsi_host: switch ida to idr to hold shost ptr Douglas Gilbert

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200720025742.349296-6-dgilbert@interlog.com \
    --to=dgilbert@interlog.com \
    --cc=hare@suse.de \
    --cc=jejb@linux.vnet.ibm.com \
    --cc=linux-scsi@vger.kernel.org \
    --cc=martin.petersen@oracle.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.