linux-kernel - [PATCH 2/5] scsi: megaraid_sas - added bios_param in scsi_host

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Date:	Tue, 06 Feb 2007 13:57:23 -0800
From:	Sumant Patro <sumantp@...l.com>
To:	James.Bottomley@...elEye.com, akpm@...l.org,
	linux-scsi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, neela.kolli@....com, bo.yang@....com,
	sumant.patro@....com
Subject: [PATCH 2/5] scsi: megaraid_sas - added bios_param in
	scsi_host_template

Added bios_param in scsi_host_template to return disk geometry.

Signed-off-by: Sumant Patro <sumant.patro@....com>
---

 drivers/scsi/megaraid/megaraid_sas.c |   45 +++++++++++++++++++++++++
 1 files changed, 45 insertions(+)

diff -uprN 2.6.new-p1/drivers/scsi/megaraid/megaraid_sas.c 2.6.new-p2/drivers/scsi/megaraid/megaraid_sas.c
--- 2.6.new-p1/drivers/scsi/megaraid/megaraid_sas.c	2007-02-06 06:54:07.000000000 -0800
+++ 2.6.new-p2/drivers/scsi/megaraid/megaraid_sas.c	2007-02-06 08:43:40.000000000 -0800
@@ -35,6 +35,7 @@
 #include <asm/uaccess.h>
 #include <linux/fs.h>
 #include <linux/compat.h>
+#include <linux/blkdev.h>
 #include <linux/mutex.h>
 
 #include <scsi/scsi.h>
@@ -1015,6 +1016,49 @@ static int megasas_reset_bus_host(struct
 }
 
 /**
+ * megasas_bios_param - Returns disk geometry for a disk
+ * @sdev: 		device handle
+ * @bdev:		block device
+ * @capacity:		drive capacity
+ * @geom:		geometry parameters
+ */
+static int
+megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev,
+		 sector_t capacity, int geom[])
+{
+	int 		heads;
+	int 		sectors;
+	sector_t	cylinders;
+	ulong		dummy;
+	/* Default heads (64) & sectors (32) */
+	heads 		= 64;
+	sectors 	= 32;
+
+	dummy		= heads * sectors;
+	cylinders	=  capacity;
+
+	sector_div(cylinders, dummy);
+
+	/*
+	 * Handle extended translation size for logical drives > 1Gb
+	 */
+	
+	if ((ulong)capacity >= 0x200000) {
+		heads = 255;
+		sectors = 63;
+		dummy = heads*sectors;
+		cylinders = capacity;
+		sector_div(cylinders, dummy);
+	}
+	
+	geom[0] = heads;
+	geom[1] = sectors;
+	geom[2] = cylinders;
+
+	return 0;
+}
+
+/**
  * megasas_service_aen -	Processes an event notification
  * @instance:			Adapter soft state
  * @cmd:			AEN command completed by the ISR
@@ -1054,6 +1098,7 @@ static struct scsi_host_template megasas
 	.eh_device_reset_handler = megasas_reset_device,
 	.eh_bus_reset_handler = megasas_reset_bus_host,
 	.eh_host_reset_handler = megasas_reset_bus_host,
+	.bios_param = megasas_bios_param,
 	.use_clustering = ENABLE_CLUSTERING,
 };
 


View attachment "p2-bios_param.patch" of type "text/x-patch" (1828 bytes)