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| author | Stephen M. Cameron <scameron@beardog.cce.hp.com> | 2010-02-25 14:02:51 -0600 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2010-03-03 18:35:40 +0530 |
| commit | 667e23d4e968f6826dc5d3e81238a7f1f343fb4f (patch) | |
| tree | e29001893863cb6315c8a45096f93e4f668bdce0 /drivers/scsi/hpsa.c | |
| parent | b0f4d4cf12d0eaa0bd766686bba843fc105b6a60 (diff) | |
| download | lwn-667e23d4e968f6826dc5d3e81238a7f1f343fb4f.tar.gz lwn-667e23d4e968f6826dc5d3e81238a7f1f343fb4f.zip | |
[SCSI] hpsa: allow modifying device queue depth.
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/hpsa.c')
| -rw-r--r-- | drivers/scsi/hpsa.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index 03697ba94251..745c62444d25 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -43,6 +43,7 @@ #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> #include <scsi/scsi_host.h> +#include <scsi/scsi_tcq.h> #include <linux/cciss_ioctl.h> #include <linux/string.h> #include <linux/bitmap.h> @@ -134,6 +135,8 @@ static int hpsa_scsi_queue_command(struct scsi_cmnd *cmd, static void hpsa_scan_start(struct Scsi_Host *); static int hpsa_scan_finished(struct Scsi_Host *sh, unsigned long elapsed_time); +static int hpsa_change_queue_depth(struct scsi_device *sdev, + int qdepth, int reason); static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd); static int hpsa_slave_alloc(struct scsi_device *sdev); @@ -182,6 +185,7 @@ static struct scsi_host_template hpsa_driver_template = { .queuecommand = hpsa_scsi_queue_command, .scan_start = hpsa_scan_start, .scan_finished = hpsa_scan_finished, + .change_queue_depth = hpsa_change_queue_depth, .this_id = -1, .sg_tablesize = MAXSGENTRIES, .use_clustering = ENABLE_CLUSTERING, @@ -2077,6 +2081,23 @@ static int hpsa_scan_finished(struct Scsi_Host *sh, return finished; } +static int hpsa_change_queue_depth(struct scsi_device *sdev, + int qdepth, int reason) +{ + struct ctlr_info *h = sdev_to_hba(sdev); + + if (reason != SCSI_QDEPTH_DEFAULT) + return -ENOTSUPP; + + if (qdepth < 1) + qdepth = 1; + else + if (qdepth > h->nr_cmds) + qdepth = h->nr_cmds; + scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth); + return sdev->queue_depth; +} + static void hpsa_unregister_scsi(struct ctlr_info *h) { /* we are being forcibly unloaded, and may not refuse. */ |