libata: Expose TRIM capability in sysfs
Create a sysfs "trim" attribute for each ata_device that displays
whether DSM TRIM is "unsupported", "unqueued", "forced_unqueued"
(blacklisted) or "queued".
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/Documentation/ABI/testing/sysfs-ata b/Documentation/ABI/testing/sysfs-ata
index 0a93215..9231dae 100644
--- a/Documentation/ABI/testing/sysfs-ata
+++ b/Documentation/ABI/testing/sysfs-ata
@@ -90,6 +90,17 @@
130: SATA_PMP_GSCR_SII_GPIO
Only valid if the device is a PM.
+trim
+
+ Shows the DSM TRIM mode currently used by the device. Valid
+ values are:
+ unsupported: Drive does not support DSM TRIM
+ unqueued: Drive supports unqueued DSM TRIM only
+ queued: Drive supports queued DSM TRIM
+ forced_unqueued: Drive's unqueued DSM support is known to be
+ buggy and only unqueued TRIM commands
+ are sent
+
spdn_cnt
Number of time libata decided to lower the speed of link due to errors.
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index 3227b7c..d6c37bc 100644
--- a/drivers/ata/libata-transport.c
+++ b/drivers/ata/libata-transport.c
@@ -560,6 +560,27 @@
static DEVICE_ATTR(gscr, S_IRUGO, show_ata_dev_gscr, NULL);
+static ssize_t
+show_ata_dev_trim(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ata_device *ata_dev = transport_class_to_dev(dev);
+ unsigned char *mode;
+
+ if (!ata_id_has_trim(ata_dev->id))
+ mode = "unsupported";
+ else if (ata_dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM)
+ mode = "forced_unqueued";
+ else if (ata_fpdma_dsm_supported(ata_dev))
+ mode = "queued";
+ else
+ mode = "unqueued";
+
+ return snprintf(buf, 20, "%s\n", mode);
+}
+
+static DEVICE_ATTR(trim, S_IRUGO, show_ata_dev_trim, NULL);
+
static DECLARE_TRANSPORT_CLASS(ata_dev_class,
"ata_device", NULL, NULL, NULL);
@@ -733,6 +754,7 @@
SETUP_DEV_ATTRIBUTE(ering);
SETUP_DEV_ATTRIBUTE(id);
SETUP_DEV_ATTRIBUTE(gscr);
+ SETUP_DEV_ATTRIBUTE(trim);
BUG_ON(count > ATA_DEV_ATTRS);
i->dev_attrs[count] = NULL;