Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5c9cfeddbb49954b459fda91bf5479f5a0a4e409
Commit: 5c9cfeddbb49954b459fda91bf5479f5a0a4e409
Parent: 32fbac2256cedee62de5602b1703c15c150a6e14
Author: Salyzyn, Mark <[EMAIL PROTECTED]>
AuthorDate: Wed May 30 10:01:14 2007 -0400
Committer: James Bottomley <[EMAIL PROTECTED]>
CommitDate: Fri Jun 1 11:39:56 2007 -0400
[SCSI] aacraid: Changeable queue depth
Inspired by Brian King's patch to the ibmvscsi driver. Adds support for
a changeable queue depth to the aacraid driver.
Signed-off-by: Mark Salyzyn <[EMAIL PROTECTED]>
Signed-off-by: James Bottomley <[EMAIL PROTECTED]>
---
drivers/scsi/aacraid/linit.c | 38 ++++++++++++++++++++++++++++++++++++++
1 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index a270a3f..6f92d07 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -446,6 +446,43 @@ static int aac_slave_configure(struct scsi_device *sdev)
return 0;
}
+/**
+ * aac_change_queue_depth - alter queue depths
+ * @sdev: SCSI device we are considering
+ * @depth: desired queue depth
+ *
+ * Alters queue depths for target device based on the host adapter's
+ * total capacity and the queue depth supported by the target device.
+ */
+
+static int aac_change_queue_depth(struct scsi_device *sdev, int depth)
+{
+ if (sdev->tagged_supported && (sdev->type == TYPE_DISK) &&
+ (sdev_channel(sdev) == CONTAINER_CHANNEL)) {
+ struct scsi_device * dev;
+ struct Scsi_Host *host = sdev->host;
+ unsigned num = 0;
+
+ __shost_for_each_device(dev, host) {
+ if (dev->tagged_supported && (dev->type == TYPE_DISK) &&
+ (sdev_channel(dev) == CONTAINER_CHANNEL))
+ ++num;
+ ++num;
+ }
+ if (num >= host->can_queue)
+ num = host->can_queue - 1;
+ if (depth > (host->can_queue - num))
+ depth = host->can_queue - num;
+ if (depth > 256)
+ depth = 256;
+ else if (depth < 2)
+ depth = 2;
+ scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth);
+ } else
+ scsi_adjust_queue_depth(sdev, 0, 1);
+ return sdev->queue_depth;
+}
+
static int aac_ioctl(struct scsi_device *sdev, int cmd, void __user * arg)
{
struct aac_dev *dev = (struct aac_dev *)sdev->host->hostdata;
@@ -844,6 +881,7 @@ static struct scsi_host_template aac_driver_template = {
.bios_param = aac_biosparm,
.shost_attrs = aac_attrs,
.slave_configure = aac_slave_configure,
+ .change_queue_depth = aac_change_queue_depth,
.eh_abort_handler = aac_eh_abort,
.eh_host_reset_handler = aac_eh_reset,
.can_queue = AAC_NUM_IO_FIB,
-
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