[SCSI] megaraid_sas: add bios_param in scsi_host_template

Signed-off-by: Sumant Patro <sumant.patro@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 6ff540140807..9c5e4da5a132 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -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 scsi_cmnd *scmd)
 }
 
 /**
+ * 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_template = {
 	.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,
 };