From: Sumant Patro <sumantp@lsil.com>
To: James.Bottomley@SteelEye.com, akpm@osdl.org
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
neela.kolli@lsi.com, bo.yang@lsi.com, sumant.patro@lsi.com
Subject: [PATCH 2/6] scsi: megaraid_sas - added bios_param in scsi_host_template
Date: Wed, 14 Feb 2007 12:41:55 -0800 [thread overview]
Message-ID: <1171485715.4188.13.camel@dumbo> (raw)
Added bios_param in scsi_host_template to return disk geometry.
Signed-off-by: Sumant Patro <sumant.patro@lsi.com>
---
drivers/scsi/megaraid/megaraid_sas.c | 45 +++++++++++++++++++++++++
1 files changed, 45 insertions(+)
Resubmitting with following changes : ulong -> unsigned long, removed type-casting
in size comparison of > 1Gb
diff -uprN linux-feb13-new-p1/drivers/scsi/megaraid/megaraid_sas.c linux-feb13-new-p2/drivers/scsi/megaraid/megaraid_sas.c
--- linux-feb13-new-p1/drivers/scsi/megaraid/megaraid_sas.c 2007-02-13 07:18:39.000000000 -0800
+++ linux-feb13-new-p2/drivers/scsi/megaraid/megaraid_sas.c 2007-02-13 11:34:58.000000000 -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;
+ unsigned long tmp;
+ /* Default heads (64) & sectors (32) */
+ heads = 64;
+ sectors = 32;
+
+ tmp = heads * sectors;
+ cylinders = capacity;
+
+ sector_div(cylinders, tmp);
+
+ /*
+ * Handle extended translation size for logical drives > 1Gb
+ */
+
+ if (capacity >= 0x200000) {
+ heads = 255;
+ sectors = 63;
+ tmp = heads*sectors;
+ cylinders = capacity;
+ sector_div(cylinders, tmp);
+ }
+
+ 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,
};
reply other threads:[~2007-02-15 1:51 UTC|newest]
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