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Commit 90eebd37 authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Sasha Levin
Browse files

libata: Expose TRIM capability in sysfs 



[ Upstream commit f303074160d3401970ccae082014e1ee5a9a52c5 ]

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: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent f17728b7

Documentation/ABI/testing/sysfs-ata

+11 −0
Original line number Diff line number Diff line
@@ -90,6 +90,17 @@ gscr 
	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.

drivers/ata/libata-transport.c

+22 −0
Original line number Diff line number Diff line
@@ -559,6 +559,27 @@ 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);
@@ -732,6 +753,7 @@ 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;