From cf62a0a543fbab15286509d2e04e3dcf5549e966 Mon Sep 17 00:00:00 2001 From: Sumant Patro Date: Wed, 14 Feb 2007 12:41:55 -0800 Subject: [SCSI] megaraid_sas: add bios_param in scsi_host_template Signed-off-by: Sumant Patro Signed-off-by: James Bottomley --- drivers/scsi/megaraid/megaraid_sas.c | 45 ++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) (limited to 'drivers/scsi/megaraid') 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 #include #include +#include #include #include @@ -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, }; -- cgit v1.2.3