From 00a47e7e71a2fbceb4ec565593738b0b3f06a42b Mon Sep 17 00:00:00 2001 From: "Eugene (jno) Dvurechenski" Date: Fri, 29 Aug 2014 11:01:37 +0200 Subject: pc-bios/s390-ccw: handle more ECKD DASD block sizes Using dasdfmt(8) to format a DASD allows to choose a block size. There are four supported values: 512, 1024, 2048, and 4096 bytes per block. Each block size leads to selection of new count of sectors per track. The head count remains always the same: 15. This empiric knowledge is used to detect ECKD DASD to IPL from. Signed-off-by: Eugene (jno) Dvurechenski Reviewed-by: David Hildenbrand Acked-by: Christian Borntraeger Signed-off-by: Jens Freimann Signed-off-by: Christian Borntraeger --- pc-bios/s390-ccw/virtio.c | 27 ++++++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) (limited to 'pc-bios/s390-ccw') diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 04977e4..6ed3dc9 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -299,14 +299,35 @@ bool virtio_disk_is_scsi(void) && (virtio_get_block_size() == 512); } +/* + * Other supported value pairs, if any, would need to be added here. + * Note: head count is always 15. + */ +static inline u8 virtio_eckd_sectors_for_block_size(int size) +{ + switch (size) { + case 512: + return 49; + case 1024: + return 33; + case 2048: + return 21; + case 4096: + return 12; + } + return 0; +} + bool virtio_disk_is_eckd(void) { + const int block_size = virtio_get_block_size(); + if (guessed_disk_nature) { - return (virtio_get_block_size() == 4096); + return (block_size == 4096); } return (blk_cfg.geometry.heads == 15) - && (blk_cfg.geometry.sectors == 12) - && (virtio_get_block_size() == 4096); + && (blk_cfg.geometry.sectors == + virtio_eckd_sectors_for_block_size(block_size)); } bool virtio_ipl_disk_is_valid(void) -- cgit v1.1