[kernel] r21762 - in dists/trunk/linux/debian: . patches patches/features/all
Ben Hutchings
benh at moszumanska.debian.org
Sun Sep 7 02:52:06 UTC 2014
Author: benh
Date: Sun Sep 7 02:52:06 2014
New Revision: 21762
Log:
virtio-scsi: Implement change_queue_depth for virtscsi targets (Closes: #760324)
Added:
dists/trunk/linux/debian/patches/features/all/virtio-scsi-Implement-change_queue_depth-for-virtscs.patch
Modified:
dists/trunk/linux/debian/changelog
dists/trunk/linux/debian/patches/series
Modified: dists/trunk/linux/debian/changelog
==============================================================================
--- dists/trunk/linux/debian/changelog Sat Sep 6 13:29:35 2014 (r21761)
+++ dists/trunk/linux/debian/changelog Sun Sep 7 02:52:06 2014 (r21762)
@@ -19,6 +19,8 @@
* [x86] mgag200: Enable auto-loading, but require mode-setting to be
explicitly enabled (as xserver-xorg-video-modesetting does)
* [armel] Remove obsolete mv78xx0 flavour
+ * virtio-scsi: Implement change_queue_depth for virtscsi targets
+ (Closes: #760324)
[ Vagrant Cascadian ]
* [armmp] Enable IMX_IPUV3_CORE (closes: #756810).
Added: dists/trunk/linux/debian/patches/features/all/virtio-scsi-Implement-change_queue_depth-for-virtscs.patch
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ dists/trunk/linux/debian/patches/features/all/virtio-scsi-Implement-change_queue_depth-for-virtscs.patch Sun Sep 7 02:52:06 2014 (r21762)
@@ -0,0 +1,83 @@
+From: Venkatesh Srinivas <venkateshs at google.com>
+Date: Sun, 6 Jul 2014 16:39:27 +0200
+Subject: virtio-scsi: Implement change_queue_depth for virtscsi targets
+Origin: https://git.kernel.org/linus/761f1193f299873236dbc21277864d70cb7ba8a3
+
+change_queue_depth allows changing per-target queue depth via sysfs.
+
+It also allows the SCSI midlayer to ramp down the number of concurrent
+inflight requests in response to a SCSI BUSY status response and allows
+the midlayer to ramp the count back up to the device maximum when the
+BUSY condition has resolved.
+
+Signed-off-by: Venkatesh Srinivas <venkateshs at google.com>
+Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
+Signed-off-by: Christoph Hellwig <hch at lst.de>
+[bwh: Backported to 3.16: adjust context]
+---
+ drivers/scsi/virtio_scsi.c | 33 +++++++++++++++++++++++++++++++++
+ 1 file changed, 33 insertions(+)
+
+--- a/drivers/scsi/virtio_scsi.c
++++ b/drivers/scsi/virtio_scsi.c
+@@ -27,6 +27,7 @@
+ #include <scsi/scsi_host.h>
+ #include <scsi/scsi_device.h>
+ #include <scsi/scsi_cmnd.h>
++#include <scsi/scsi_tcq.h>
+
+ #define VIRTIO_SCSI_MEMPOOL_SZ 64
+ #define VIRTIO_SCSI_EVENT_LEN 8
+@@ -641,6 +642,36 @@ static int virtscsi_device_reset(struct
+ return virtscsi_tmf(vscsi, cmd);
+ }
+
++/**
++ * virtscsi_change_queue_depth() - Change a virtscsi target's queue depth
++ * @sdev: Virtscsi target whose queue depth to change
++ * @qdepth: New queue depth
++ * @reason: Reason for the queue depth change.
++ */
++static int virtscsi_change_queue_depth(struct scsi_device *sdev,
++ int qdepth,
++ int reason)
++{
++ struct Scsi_Host *shost = sdev->host;
++ int max_depth = shost->cmd_per_lun;
++
++ switch (reason) {
++ case SCSI_QDEPTH_QFULL: /* Drop qdepth in response to BUSY state */
++ scsi_track_queue_full(sdev, qdepth);
++ break;
++ case SCSI_QDEPTH_RAMP_UP: /* Raise qdepth after BUSY state resolved */
++ case SCSI_QDEPTH_DEFAULT: /* Manual change via sysfs */
++ scsi_adjust_queue_depth(sdev,
++ scsi_get_tag_type(sdev),
++ min(max_depth, qdepth));
++ break;
++ default:
++ return -EOPNOTSUPP;
++ }
++
++ return sdev->queue_depth;
++}
++
+ static int virtscsi_abort(struct scsi_cmnd *sc)
+ {
+ struct virtio_scsi *vscsi = shost_priv(sc->device->host);
+@@ -693,6 +724,7 @@ static struct scsi_host_template virtscs
+ .this_id = -1,
+ .cmd_size = sizeof(struct virtio_scsi_cmd),
+ .queuecommand = virtscsi_queuecommand_single,
++ .change_queue_depth = virtscsi_change_queue_depth,
+ .eh_abort_handler = virtscsi_abort,
+ .eh_device_reset_handler = virtscsi_device_reset,
+
+@@ -710,6 +742,7 @@ static struct scsi_host_template virtscs
+ .this_id = -1,
+ .cmd_size = sizeof(struct virtio_scsi_cmd),
+ .queuecommand = virtscsi_queuecommand_multi,
++ .change_queue_depth = virtscsi_change_queue_depth,
+ .eh_abort_handler = virtscsi_abort,
+ .eh_device_reset_handler = virtscsi_device_reset,
+
Modified: dists/trunk/linux/debian/patches/series
==============================================================================
--- dists/trunk/linux/debian/patches/series Sat Sep 6 13:29:35 2014 (r21761)
+++ dists/trunk/linux/debian/patches/series Sun Sep 7 02:52:06 2014 (r21762)
@@ -105,3 +105,4 @@
features/x86/x86-make-x32-syscall-support-conditional.patch
bugfix/s390/s390-3215-fix-hanging-console-issue.patch
bugfix/all/aio-fix-reqs_available-handling.patch
+features/all/virtio-scsi-Implement-change_queue_depth-for-virtscs.patch
More information about the Kernel-svn-changes
mailing list