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>
diff --git a/include/linux/ata.h b/include/linux/ata.h
index e2595e8..dfa2298 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -75,6 +75,7 @@
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 @@
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