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[SCSI] hpsa: allow driver to put controller in either simple or performant mode

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Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Stephen M. Cameron 2011-01-06 14:48:29 -06:00 committed by James Bottomley
parent 6eaf46fdc7
commit 02ec19c82e
2 changed files with 13 additions and 0 deletions
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6
Documentation/scsi/hpsa.txt
View File

@ -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
-----------------------------

7
drivers/scsi/hpsa.c
View File

@ -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;