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libata: Expose TRIM capability in sysfs

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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 <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Martin K. Petersen 2015-05-04 21:54:19 -04:00 • committed by Tejun Heo
commit f303074160
2 changed files with 33 additions and 0 deletions
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22
drivers/ata/libata-transport.c
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@ -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;