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>
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@ -299,14 +299,35 @@ bool virtio_disk_is_scsi(void)
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&& (virtio_get_block_size() == 512);
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}
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/*
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* Other supported value pairs, if any, would need to be added here.
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* Note: head count is always 15.
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*/
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static inline u8 virtio_eckd_sectors_for_block_size(int size)
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{
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switch (size) {
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case 512:
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return 49;
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case 1024:
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return 33;
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case 2048:
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return 21;
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case 4096:
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return 12;
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}
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return 0;
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}
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bool virtio_disk_is_eckd(void)
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{
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const int block_size = virtio_get_block_size();
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if (guessed_disk_nature) {
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return (virtio_get_block_size() == 4096);
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return (block_size == 4096);
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}
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return (blk_cfg.geometry.heads == 15)
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&& (blk_cfg.geometry.sectors == 12)
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&& (virtio_get_block_size() == 4096);
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&& (blk_cfg.geometry.sectors ==
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virtio_eckd_sectors_for_block_size(block_size));
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}
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bool virtio_ipl_disk_is_valid(void)
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