[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 6ff54014080..9c5e4da5a13 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,
 };