Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756034AbXI1UKk (ORCPT ); Fri, 28 Sep 2007 16:10:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753552AbXI1UK3 (ORCPT ); Fri, 28 Sep 2007 16:10:29 -0400 Received: from mail0.lsil.com ([147.145.40.20]:51257 "EHLO mail0.lsil.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752518AbXI1UK1 (ORCPT ); Fri, 28 Sep 2007 16:10:27 -0400 Subject: [PATCH 3/8] scsi: megaraid_sas - add module param max_sectors, cmd_per_lun From: bo yang To: linux-scsi@vger.kernel.org Cc: James.Bottomley@SteelEye.com, akpm@osdl.org, linux-kernel@vger.kernel.org, Bo.yang@lsi.com, Sumant.patro@lsi.com Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Wed, 26 Sep 2007 11:27:50 -0400 Message-Id: <1190820470.5955.12.camel@dhcp-75-534.se.lsil.com> Mime-Version: 1.0 X-Mailer: Evolution 2.0.2 (2.0.2-35.el4) X-OriginalArrivalTime: 28 Sep 2007 20:10:16.0095 (UTC) FILETIME=[95C942F0:01C8020B] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5683 Lines: 180 Adding module parameters to configure max sectors per request & # of cmds per lun. Signed-off-by: Bo Yang --- drivers/scsi/megaraid/megaraid_sas.c | 94 ++++++++++++++++++++++++- drivers/scsi/megaraid/megaraid_sas.h | 2 2 files changed, 94 insertions(+), 2 deletions(-) diff -uprN linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c --- linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c 2007-09-26 13:30:36.000000000 -0700 +++ linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c 2007-09-27 20:37:11.000000000 -0700 @@ -62,6 +62,23 @@ MODULE_PARM_DESC(fast_load, "megasas: Faster loading of the driver, skips physical devices! \ (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"); + +/* + * Number of cmds per logical unit + */ +static unsigned int cmd_per_lun = MEGASAS_DEFAULT_CMD_PER_LUN; +module_param_named(cmd_per_lun, cmd_per_lun, int, 0); +MODULE_PARM_DESC(cmd_per_lun, + "Maximum number of commands per logical unit (default=128)"); + MODULE_LICENSE("GPL"); MODULE_VERSION(MEGASAS_VERSION); MODULE_AUTHOR("megaraidlinux@lsi.com"); @@ -2301,6 +2318,31 @@ static int megasas_start_aen(struct mega class_locale.word); } +static ssize_t +sysfs_max_sectors_read(struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct Scsi_Host *host = class_to_shost(container_of(kobj, + struct class_device, kobj)); + struct megasas_instance *instance = + (struct megasas_instance *)host->hostdata; + + count = sprintf(buf, "%u\n", instance->max_sectors_per_req); + + return count+1; +} + +static struct bin_attribute sysfs_max_sectors_attr = { + .attr = { + .name = "max_sectors", + .mode = S_IRUSR|S_IRGRP|S_IROTH, + .owner = THIS_MODULE, + }, + .size = 7, + .read = sysfs_max_sectors_read, +}; + /** * megasas_io_attach - Attaches this driver to SCSI mid-layer * @instance: Adapter soft state @@ -2308,17 +2350,48 @@ static int megasas_start_aen(struct mega static int megasas_io_attach(struct megasas_instance *instance) { struct Scsi_Host *host = instance->host; + int error; /* - * Export parameters required by SCSI mid-layer + * Export host parameters required by SCSI + * mid-layer */ host->irq = instance->pdev->irq; host->unique_id = instance->unique_id; host->can_queue = 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) + printk(KERN_INFO + "megasas: max_sectors should be > 0 and" + "<= %d\n", + instance->max_sectors_per_req); + } + host->max_sectors = instance->max_sectors_per_req; - host->cmd_per_lun = 128; + + /* + * Check if the module parameter value for cmd_per_lun can be used + */ + instance->cmd_per_lun = MEGASAS_DEFAULT_CMD_PER_LUN; + if (cmd_per_lun && cmd_per_lun <= MEGASAS_DEFAULT_CMD_PER_LUN) + instance->cmd_per_lun = cmd_per_lun; + else + printk(KERN_INFO "megasas: cmd_per_lun should be > 0 and" + "<= %d\n", MEGASAS_DEFAULT_CMD_PER_LUN); + + host->cmd_per_lun = instance->cmd_per_lun; + + printk(KERN_DEBUG "megasas: max_sectors : 0x%x, cmd_per_lun : 0x%x\n", + instance->max_sectors_per_req, instance->cmd_per_lun); + host->max_channel = MEGASAS_MAX_CHANNELS - 1; host->max_id = MEGASAS_MAX_DEV_PER_CHANNEL; host->max_lun = MEGASAS_MAX_LUN; @@ -2333,10 +2406,25 @@ static int megasas_io_attach(struct mega } /* + * Create sysfs entries for module paramaters + */ + error = sysfs_create_bin_file(&instance->host->shost_classdev.kobj, + &sysfs_max_sectors_attr); + if (error) { + printk(KERN_INFO "megasas: Error in creating the sysfs entry" + " max_sectors.\n"); + goto out_remove_host; + } + + /* * Trigger SCSI to scan our drives */ scsi_scan_host(host); return 0; + +out_remove_host: + scsi_remove_host(host); + return error; } static int @@ -2750,6 +2838,8 @@ static void megasas_detach_one(struct pc instance = pci_get_drvdata(pdev); host = instance->host; + sysfs_remove_bin_file(&host->shost_classdev.kobj, + &sysfs_max_sectors_attr); scsi_remove_host(instance->host); megasas_flush_cache(instance); megasas_shutdown_controller(instance, MR_DCMD_CTRL_SHUTDOWN); diff -uprN linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.h linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.h --- linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.h 2007-09-26 13:27:59.000000000 -0700 +++ linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.h 2007-09-26 13:27:31.000000000 -0700 @@ -537,6 +537,7 @@ struct megasas_ctrl_info { #define MEGASAS_DEFAULT_INIT_ID -1 #define MEGASAS_MAX_LUN 8 #define MEGASAS_MAX_LD 64 +#define MEGASAS_DEFAULT_CMD_PER_LUN 128 #define MEGASAS_DBG_LVL 1 @@ -1080,6 +1081,7 @@ struct megasas_instance { u16 max_num_sge; u16 max_fw_cmds; u32 max_sectors_per_req; + u32 cmd_per_lun; struct megasas_cmd **cmd_list; struct list_head cmd_pool; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/