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authorEugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>2014-08-29 11:01:36 +0200
committerChristian Borntraeger <borntraeger@de.ibm.com>2014-09-01 09:23:02 +0200
commit92cb05574b7bd489be81f9c58497dc7dfe5d8859 (patch)
tree4bbca10d0e306d41bb576c8aa59062271c9d551a /pc-bios
parent159855f098489160df9cb13ce1667a4d6dd76895 (diff)
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pc-bios/s390-ccw: support all virtio block size
The block size value may be given "as is" OR as a base value and a shift count (exponent). So, we have to use calculation to get the proper number in the code. The main expression reads as (blk_cfg.blk_size << blk_cfg.physical_block_exp) E.g., various combinations between blk_size=1/physical_block_exp=12 and blk_size=4096/physical_block_exp=0 are valid for 4K blocks. Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'pc-bios')
-rw-r--r--pc-bios/s390-ccw/virtio.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 31b23b0..04977e4 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -275,12 +275,14 @@ void virtio_assume_scsi(void)
{
guessed_disk_nature = true;
blk_cfg.blk_size = 512;
+ blk_cfg.physical_block_exp = 0;
}
void virtio_assume_eckd(void)
{
guessed_disk_nature = true;
blk_cfg.blk_size = 4096;
+ blk_cfg.physical_block_exp = 0;
/* this must be here to calculate code segment position */
blk_cfg.geometry.heads = 15;
@@ -290,31 +292,31 @@ void virtio_assume_eckd(void)
bool virtio_disk_is_scsi(void)
{
if (guessed_disk_nature) {
- return (blk_cfg.blk_size == 512);
+ return (virtio_get_block_size() == 512);
}
return (blk_cfg.geometry.heads == 255)
&& (blk_cfg.geometry.sectors == 63)
- && (blk_cfg.blk_size == 512);
+ && (virtio_get_block_size() == 512);
}
bool virtio_disk_is_eckd(void)
{
if (guessed_disk_nature) {
- return (blk_cfg.blk_size == 4096);
+ return (virtio_get_block_size() == 4096);
}
return (blk_cfg.geometry.heads == 15)
&& (blk_cfg.geometry.sectors == 12)
- && (blk_cfg.blk_size == 4096);
+ && (virtio_get_block_size() == 4096);
}
bool virtio_ipl_disk_is_valid(void)
{
- return blk_cfg.blk_size && (virtio_disk_is_scsi() || virtio_disk_is_eckd());
+ return virtio_disk_is_scsi() || virtio_disk_is_eckd();
}
int virtio_get_block_size(void)
{
- return blk_cfg.blk_size;
+ return blk_cfg.blk_size << blk_cfg.physical_block_exp;
}
uint16_t virtio_get_cylinders(void)