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libata: Report zeroed read after TRIM and max discard size 

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 <martin.petersen@oracle.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Martin K. Petersen 2009-11-26 22:46:03 -05:00 committed by Jeff Garzik
parent d413ff3e2a
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;

11
include/linux/ata.h
View File

@ -75,6 +75,7 @@ enum {
ATA_ID_EIDE_DMA_TIME = 66,
ATA_ID_EIDE_PIO = 67,
ATA_ID_EIDE_PIO_IORDY = 68,
ATA_ID_ADDITIONAL_SUPP = 69,
ATA_ID_QUEUE_DEPTH = 75,
ATA_ID_MAJOR_VER = 80,
ATA_ID_COMMAND_SET_1 = 82,
@ -816,6 +817,16 @@ static inline int ata_id_has_trim(const u16 *id)
return 0;
}
static inline int ata_id_has_zero_after_trim(const u16 *id)
{
/* DSM supported, deterministic read, and read zero after trim set */
if (ata_id_has_trim(id) &&
(id[ATA_ID_ADDITIONAL_SUPP] & 0x4020) == 0x4020)
return 1;
return 0;
}
static inline int ata_id_current_chs_valid(const u16 *id)
{
/* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command