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authorKashyap, Desai <kashyap.desai@lsi.com>2011-06-14 05:26:12 (GMT)
committerJames Bottomley <JBottomley@Parallels.com>2011-06-29 21:15:00 (GMT)
commita3e1e55e4b5ca4d49618c592b4d10814e21e12a7 (patch)
treefce4875375a44e4374fb57fa7cdfab8f74cdf2de /drivers/scsi/mpt2sas
parentce7b1810def1e2f0101931f8f339f9d8a694cd19 (diff)
downloadlinux-a3e1e55e4b5ca4d49618c592b4d10814e21e12a7.tar.xz
[SCSI] mpt2sas: Set max_sector count from module parameter
This feature is to override the default max_sectors setting at load time, taking max_sectors as an command line option when loading the driver. The setting is currently hard-coded in the driver to 8192 sectors (4MB transfers). If max_sectors is specified at load time, minimum specified setting will be 64, and the maximum is 8192. The driver will modify the setting to be on even boundary. If max_sectors is not specified, the driver will default to 8192. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/mpt2sas')
-rw-r--r--drivers/scsi/mpt2sas/mpt2sas_scsih.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index e327a3c..f86f2b1 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -94,6 +94,10 @@ static u32 logging_level;
MODULE_PARM_DESC(logging_level, " bits for enabling additional logging info "
"(default=0)");
+static ushort max_sectors = 0xFFFF;
+module_param(max_sectors, ushort, 0);
+MODULE_PARM_DESC(max_sectors, "max sectors, range 64 to 8192 default=8192");
+
/* scsi-mid layer global parmeter is max_report_luns, which is 511 */
#define MPT2SAS_MAX_LUN (16895)
static int max_lun = MPT2SAS_MAX_LUN;
@@ -7436,6 +7440,25 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
shost->transportt = mpt2sas_transport_template;
shost->unique_id = ioc->id;
+ if (max_sectors != 0xFFFF) {
+ if (max_sectors < 64) {
+ shost->max_sectors = 64;
+ printk(MPT2SAS_WARN_FMT "Invalid value %d passed "
+ "for max_sectors, range is 64 to 8192. Assigning "
+ "value of 64.\n", ioc->name, max_sectors);
+ } else if (max_sectors > 8192) {
+ shost->max_sectors = 8192;
+ printk(MPT2SAS_WARN_FMT "Invalid value %d passed "
+ "for max_sectors, range is 64 to 8192. Assigning "
+ "default value of 8192.\n", ioc->name,
+ max_sectors);
+ } else {
+ shost->max_sectors = max_sectors & 0xFFFE;
+ printk(MPT2SAS_INFO_FMT "The max_sectors value is "
+ "set to %d\n", ioc->name, shost->max_sectors);
+ }
+ }
+
if ((scsi_add_host(shost, &pdev->dev))) {
printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
ioc->name, __FILE__, __LINE__, __func__);