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Commit 1fd10685 authored by Yang, Bo's avatar Yang, Bo Committed by James Bottomley
Browse files

[SCSI] megaraid_sas: Add input parameter for max_sectors 



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: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 837f5fe8

drivers/scsi/megaraid/megaraid_sas.c

+30 −0
Original line number Diff line number Diff line
@@ -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;

drivers/scsi/megaraid/megaraid_sas.h

+1 −0
Original line number Diff line number Diff line
@@ -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