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libata: Report zeroed read after TRIM and max discard size

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Our current TRIM payload is a single sector that can accommodate 64 *
65535 blocks being unmapped.  Report this value in the Block Limits
Maximum Unmap LBA count field.

If a storage device supports TRIM and the DRAT and RZAT bits are set,
report TPRZ=1 in Read Capacity(16).

Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Jeff Garzik <[email protected]>
This commit is contained in:
Martin K. Petersen 2009-11-26 22:46:03 -05:00 • committed by Jeff Garzik
commit e78db4dfb1
2 changed files with 20 additions and 3 deletions
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12
drivers/ata/libata-scsi.c
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@ -2115,8 +2115,10 @@ static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
* that we support some form of unmap - in thise case via WRITE SAME
* with the unmap bit set.
*/
if (ata_id_has_trim(args->id))
if (ata_id_has_trim(args->id)) {
put_unaligned_be32(65535 * 512 / 8, &rbuf[20]);
put_unaligned_be32(1, &rbuf[28]);
}
return 0;
}
@ -2411,8 +2413,12 @@ static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
rbuf[14] = (lowest_aligned >> 8) & 0x3f;
rbuf[15] = lowest_aligned;
if (ata_id_has_trim(args->id))
rbuf[14] |= 0x80;
if (ata_id_has_trim(args->id)) {
rbuf[14] |= 0x80; /* TPE */
if (ata_id_has_zero_after_trim(args->id))
rbuf[14] |= 0x40; /* TPRZ */
}
}
return 0;