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authorStephen M. Cameron <scameron@beardog.cce.hp.com>2011-05-03 23:54:12 +0400
committerJens Axboe <jaxboe@fusionio.com>2011-05-06 18:23:59 +0400
commit8a4ec67bd5648beb09d7db988a75835b740e950d (patch)
tree745a87ec016b79f3cf425f581c38090a4ff8f270 /drivers/block/cciss.c
parent063d2cf72ab6101d2dd69bd6fb503b229be70325 (diff)
downloadlinux-8a4ec67bd5648beb09d7db988a75835b740e950d.tar.xz
cciss: add cciss_tape_cmds module paramter
This is to allow number of commands reserved for use by SCSI tape drives and medium changers to be adjusted at driver load time via the kernel parameter cciss_tape_cmds, with a default value of 6, and a range of 2 - 16 inclusive. Previously, the driver limited the number of commands which could be queued to the SCSI half of the the driver to only 2. This is to fix the problem that if you had more than two tape drives, you couldn't, for example, erase or rewind them all at the same time. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/block/cciss.c')
-rw-r--r--drivers/block/cciss.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 9528e94dc8b2..abe90c973540 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -64,6 +64,10 @@ MODULE_DESCRIPTION("Driver for HP Smart Array Controllers");
MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
MODULE_VERSION("3.6.26");
MODULE_LICENSE("GPL");
+static int cciss_tape_cmds = 6;
+module_param(cciss_tape_cmds, int, 0644);
+MODULE_PARM_DESC(cciss_tape_cmds,
+ "number of commands to allocate for tape devices (default: 6)");
static DEFINE_MUTEX(cciss_mutex);
static struct proc_dir_entry *proc_cciss;
@@ -4221,7 +4225,7 @@ static void __devinit cciss_get_max_perf_mode_cmds(struct ctlr_info *h)
static void __devinit cciss_find_board_params(ctlr_info_t *h)
{
cciss_get_max_perf_mode_cmds(h);
- h->nr_cmds = h->max_commands - 4; /* Allow room for some ioctls */
+ h->nr_cmds = h->max_commands - 4 - cciss_tape_cmds;
h->maxsgentries = readl(&(h->cfgtable->MaxSGElements));
/*
* Limit in-command s/g elements to 32 save dma'able memory.
@@ -4959,6 +4963,11 @@ reinit_after_soft_reset:
sprintf(h->devname, "cciss%d", i);
h->ctlr = i;
+ if (cciss_tape_cmds < 2)
+ cciss_tape_cmds = 2;
+ if (cciss_tape_cmds > 16)
+ cciss_tape_cmds = 16;
+
init_completion(&h->scan_wait);
if (cciss_create_hba_sysfs_entry(h))