diff options
| author | Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> | 2014-08-29 11:01:37 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-09-01 09:23:02 +0200 |
| commit | 00a47e7e71a2fbceb4ec565593738b0b3f06a42b (patch) | |
| tree | ee6a8499915bd2b967e78cbe3f448f54c9671ab7 | |
| parent | 92cb05574b7bd489be81f9c58497dc7dfe5d8859 (diff) | |
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 <jno@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
| -rw-r--r-- | pc-bios/s390-ccw/virtio.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 04977e4ab8..6ed3dc9cc2 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) |