[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>

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 6ff5401408073b64bc7d1e0e7042b03d7ec6d5c0..9c5e4da5a132459f09584f749de22a903508ecb5 100644 (file)
--- 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>
@@ -1014,6 +1015,49 @@ static int megasas_reset_bus_host(struct scsi_cmnd *scmd)
        return ret;
 }
 
+/**
+ * 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
@@ -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,
 };