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scsi: don't set tagging state from scsi_adjust_queue_depth

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Remove the tagged argument from scsi_adjust_queue_depth, and just let it
handle the queue depth.  For most drivers those two are fairly separate,
given that most modern drivers don't care about the SCSI "tagged" status
of a command at all, and many old drivers allow queuing of multiple
untagged commands in the driver.

Instead we start out with the ->simple_tags flag set before calling
->slave_configure, which is how all drivers actually looking at
->simple_tags except for one worke anyway.  The one other case looks
broken, but I've kept the behavior as-is for now.

Except for that we only change ->simple_tags from the ->change_queue_type,
and when rejecting a tag message in a single driver, so keeping this
churn out of scsi_adjust_queue_depth is a clear win.

Now that the usage of scsi_adjust_queue_depth is more obvious we can
also remove all the trivial instances in ->slave_alloc or ->slave_configure
that just set it to the cmd_per_lun default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2014-11-03 20:15:14 +01:00
parent 2ecb204d07
commit c8b09f6fb6
57 changed files with 120 additions and 260 deletions
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40
drivers/scsi/pmcraid.c
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@ -249,14 +249,11 @@ static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
PMCRAID_VSET_MAX_SECTORS);
}
if (scsi_dev->tagged_supported &&
(RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
scsi_dev->host->cmd_per_lun);
} else {
scsi_adjust_queue_depth(scsi_dev, 0,
scsi_dev->host->cmd_per_lun);
}
/*
* We never want to report TCQ support for these types of devices.
*/
if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
scsi_dev->tagged_supported = 0;
return 0;
}
@ -302,34 +299,11 @@ static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
if (depth > PMCRAID_MAX_CMD_PER_LUN)
depth = PMCRAID_MAX_CMD_PER_LUN;
scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
scsi_adjust_queue_depth(scsi_dev, depth);
return scsi_dev->queue_depth;
}
/**
* pmcraid_change_queue_type - Change the device's queue type
* @scsi_dev: scsi device struct
* @tag: type of tags to use
*
* Return value:
* actual queue type set
*/
static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
{
struct pmcraid_resource_entry *res;
res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
if (res && scsi_dev->tagged_supported &&
(RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)))
tag = scsi_change_queue_type(scsi_dev, tag);
else
tag = 0;
return tag;
}
/**
* pmcraid_init_cmdblk - initializes a command block
*
@ -4285,7 +4259,7 @@ static struct scsi_host_template pmcraid_host_template = {
.slave_configure = pmcraid_slave_configure,
.slave_destroy = pmcraid_slave_destroy,
.change_queue_depth = pmcraid_change_queue_depth,
.change_queue_type = pmcraid_change_queue_type,
.change_queue_type = scsi_change_queue_type,
.can_queue = PMCRAID_MAX_IO_CMD,
.this_id = -1,
.sg_tablesize = PMCRAID_MAX_IOADLS,