linux-kernel - [PATCH 3/5] scsi: megaraid_sas - Add input parameter for max

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <AANLkTimpuAfRw85ECVQ+FJxFpNaPC=zHCL1i0Y6AjiAf@mail.gmail.com>
Date:	Wed, 22 Sep 2010 22:58:00 -0400
From:	bo yang <boyang1288@...il.com>
To:	bo.yang@....com, linux-scsi@...r.kernel.org, akpm@...l.org,
	linux-kernel@...r.kernel.org, James.Bottomley@...e.de
Subject: [PATCH 3/5] 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@....com>

---
 drivers/scsi/megaraid/megaraid_sas.c |   30 ++++++++++++++++++++++++++++++
 drivers/scsi/megaraid/megaraid_sas.h |    1 +
 2 files changed, 31 insertions(+)

diff -rupN old/drivers/scsi/megaraid/megaraid_sas.c
new/drivers/scsi/megaraid/megaraid_sas.c
--- old/drivers/scsi/megaraid/megaraid_sas.c	2010-09-17 03:19:31.000000000 -0400
+++ new/drivers/scsi/megaraid/megaraid_sas.c	2010-09-17 03:20:49.000000000 -0400
@@ -57,6 +57,15 @@ module_param_named(poll_mode_io, poll_mo
 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@....com");
@@ -3587,6 +3596,27 @@ static int megasas_io_attach(struct mega
 			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;
diff -rupN old/drivers/scsi/megaraid/megaraid_sas.h
new/drivers/scsi/megaraid/megaraid_sas.h
--- old/drivers/scsi/megaraid/megaraid_sas.h	2010-09-17 02:19:46.000000000 -0400
+++ new/drivers/scsi/megaraid/megaraid_sas.h	2010-09-17 02:19:46.000000000 -0400
@@ -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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/