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[SCSI] megaraid_sas: Add input parameter for max_sectors

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Driver add the input parameters support for max_sectors for megaraid
sas gen2 chip.  Customer can set the max_sectors support to 1MB for
gen2 chip during the driver load.

Signed-off-by Bo Yang <bo.yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Yang, Bo 2010-10-12 07:18:50 -06:00 committed by James Bottomley
parent 837f5fe89c
commit 1fd1068516
2 changed files with 31 additions and 0 deletions
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30
drivers/scsi/megaraid/megaraid_sas.c
View File

@ -56,6 +56,15 @@ module_param_named(poll_mode_io, poll_mode_io, int, 0);
MODULE_PARM_DESC(poll_mode_io,
"Complete cmds from IO path, (default=0)");
/*
* Number of sectors per IO command
* Will be set in megasas_init_mfi if user does not provide
*/
static unsigned int max_sectors;
module_param_named(max_sectors, max_sectors, int, 0);
MODULE_PARM_DESC(max_sectors,
"Maximum number of sectors per IO command");
MODULE_LICENSE("GPL");
MODULE_VERSION(MEGASAS_VERSION);
MODULE_AUTHOR("megaraidlinux@lsi.com");
@ -3586,6 +3595,27 @@ static int megasas_io_attach(struct megasas_instance *instance)
instance->max_fw_cmds - MEGASAS_INT_CMDS;
host->this_id = instance->init_id;
host->sg_tablesize = instance->max_num_sge;
/*
* Check if the module parameter value for max_sectors can be used
*/
if (max_sectors && max_sectors < instance->max_sectors_per_req)
instance->max_sectors_per_req = max_sectors;
else {
if (max_sectors) {
if (((instance->pdev->device ==
PCI_DEVICE_ID_LSI_SAS1078GEN2) ||
(instance->pdev->device ==
PCI_DEVICE_ID_LSI_SAS0079GEN2)) &&
(max_sectors <= MEGASAS_MAX_SECTORS)) {
instance->max_sectors_per_req = max_sectors;
} else {
printk(KERN_INFO "megasas: max_sectors should be > 0"
"and <= %d (or < 1MB for GEN2 controller)\n",
instance->max_sectors_per_req);
}
}
}
host->max_sectors = instance->max_sectors_per_req;
host->cmd_per_lun = 128;
host->max_channel = MEGASAS_MAX_CHANNELS - 1;

1
drivers/scsi/megaraid/megaraid_sas.h
View File

@ -706,6 +706,7 @@ struct megasas_ctrl_info {
#define MEGASAS_MAX_LD_IDS (MEGASAS_MAX_LD_CHANNELS * \
MEGASAS_MAX_DEV_PER_CHANNEL)
#define MEGASAS_MAX_SECTORS (2*1024)
#define MEGASAS_DBG_LVL 1
#define MEGASAS_FW_BUSY 1