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authorStephen M. Cameron <scameron@beardog.cce.hp.com>2011-01-06 21:48:29 +0100
committerJames Bottomley <James.Bottomley@suse.de>2011-01-24 18:30:43 +0100
commit02ec19c82e87e3748d326ca5e15e7ddb18c73476 (patch)
treebec075bdfbe16a1ca5cc4df9ada03ef9a14a01b5
parent[SCSI] hpsa: take the adapter lock in hpsa_wait_for_mode_change_ack (diff)
downloadlinux-02ec19c82e87e3748d326ca5e15e7ddb18c73476.tar.xz
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[SCSI] hpsa: allow driver to put controller in either simple or performant mode
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
-rw-r--r--Documentation/scsi/hpsa.txt6
-rw-r--r--drivers/scsi/hpsa.c7
2 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/scsi/hpsa.txt b/Documentation/scsi/hpsa.txt
index dca658362cbf..b14e6ee00a95 100644
--- a/Documentation/scsi/hpsa.txt
+++ b/Documentation/scsi/hpsa.txt
@@ -28,6 +28,12 @@ boot parameter "hpsa_allow_any=1" is specified, however these are not tested
nor supported by HP with this driver. For older Smart Arrays, the cciss
driver should still be used.
+The "hpsa_simple_mode=1" boot parameter may be used to prevent the driver from
+putting the controller into "performant" mode. The difference is that with simple
+mode, each command completion requires an interrupt, while with "performant mode"
+(the default, and ordinarily better performing) it is possible to have multiple
+command completions indicated by a single interrupt.
+
HPSA specific entries in /sys
-----------------------------
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 4fb62c2aac05..10076f1868e0 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -74,6 +74,10 @@ static int hpsa_allow_any;
module_param(hpsa_allow_any, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(hpsa_allow_any,
"Allow hpsa driver to access unknown HP Smart Array hardware");
+static int hpsa_simple_mode;
+module_param(hpsa_simple_mode, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(hpsa_simple_mode,
+ "Use 'simple mode' rather than 'performant mode'");
/* define the PCI info for the cards we can control */
static const struct pci_device_id hpsa_pci_device_id[] = {
@@ -4038,6 +4042,9 @@ static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
{
u32 trans_support;
+ if (hpsa_simple_mode)
+ return;
+
trans_support = readl(&(h->cfgtable->TransportSupport));
if (!(trans_support & PERFORMANT_MODE))
return;