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authorMartin K. Petersen <martin.petersen@oracle.com>2015-05-04 21:54:19 -0400
committerTejun Heo <tj@kernel.org>2015-05-05 09:30:18 -0400
commitf303074160d3401970ccae082014e1ee5a9a52c5 (patch)
treea1ab040aa04feaa3c4763779fa07b050a6434528 /drivers/ata/libata-transport.c
parentd7b16e4f6283c6ec52b411aa6deb02ca4d030d20 (diff)
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>
Diffstat (limited to 'drivers/ata/libata-transport.c')
-rw-r--r--drivers/ata/libata-transport.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index 3227b7c8a05f..d6c37bcd416d 100644
--- a/drivers/ata/libata-transport.c
+++ b/drivers/ata/libata-transport.c
@@ -560,6 +560,27 @@ show_ata_dev_gscr(struct device *dev,
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 @@ struct scsi_transport_template *ata_attach_transport(void)
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;