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Commit 990a3af0 authored by Ezequiel Garcia's avatar Ezequiel Garcia Committed by Brian Norris
Browse files

mtd: Add sysfs attributes to expose the ECC stats fields 



These new sysfs device attributes allow us to retrieve the ECC and bad
block stats by poking a sysfs file, which is often more convenient than
using the ioctl.

Signed-off-by: default avatarEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: default avatarPekon Gupta <pekon@ti.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 89384f64

Documentation/ABI/testing/sysfs-class-mtd

+38 −0
Original line number Diff line number Diff line
@@ -184,3 +184,41 @@ Description: 


		It will always be a non-negative integer.  In the case of

		devices lacking any ECC capability, it is 0.



What:		/sys/class/mtd/mtdX/ecc_failures

Date:		June 2014

KernelVersion:	3.17

Contact:	linux-mtd@lists.infradead.org

Description:

		The number of failures reported by this device's ECC. Typically,

		these failures are associated with failed read operations.



		It will always be a non-negative integer.  In the case of

		devices lacking any ECC capability, it is 0.



What:		/sys/class/mtd/mtdX/corrected_bits

Date:		June 2014

KernelVersion:	3.17

Contact:	linux-mtd@lists.infradead.org

Description:

		The number of bits that have been corrected by means of the

		device's ECC.



		It will always be a non-negative integer.  In the case of

		devices lacking any ECC capability, it is 0.



What:		/sys/class/mtd/mtdX/bad_blocks

Date:		June 2014

KernelVersion:	3.17

Contact:	linux-mtd@lists.infradead.org

Description:

		The number of blocks marked as bad, if any, in this partition.



What:		/sys/class/mtd/mtdX/bbt_blocks

Date:		June 2014

KernelVersion:	3.17

Contact:	linux-mtd@lists.infradead.org

Description:

		The number of blocks that are marked as reserved, if any, in

		this partition. These are typically used to store the in-flash

		bad block table (BBT).

drivers/mtd/mtdcore.c

+45 −0
Original line number Diff line number Diff line
@@ -298,6 +298,47 @@ static ssize_t mtd_ecc_step_size_show(struct device *dev, 
}

static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL);



static ssize_t mtd_ecc_stats_corrected_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct mtd_info *mtd = dev_get_drvdata(dev);

	struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;



	return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->corrected);

}

static DEVICE_ATTR(corrected_bits, S_IRUGO,

		   mtd_ecc_stats_corrected_show, NULL);



static ssize_t mtd_ecc_stats_errors_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct mtd_info *mtd = dev_get_drvdata(dev);

	struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;



	return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->failed);

}

static DEVICE_ATTR(ecc_failures, S_IRUGO, mtd_ecc_stats_errors_show, NULL);



static ssize_t mtd_badblocks_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct mtd_info *mtd = dev_get_drvdata(dev);

	struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;



	return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->badblocks);

}

static DEVICE_ATTR(bad_blocks, S_IRUGO, mtd_badblocks_show, NULL);



static ssize_t mtd_bbtblocks_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct mtd_info *mtd = dev_get_drvdata(dev);

	struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;



	return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->bbtblocks);

}

static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL);



static struct attribute *mtd_attrs[] = {

	&dev_attr_type.attr,

	&dev_attr_flags.attr,
@@ -310,6 +351,10 @@ static struct attribute *mtd_attrs[] = { 
	&dev_attr_name.attr,

	&dev_attr_ecc_strength.attr,

	&dev_attr_ecc_step_size.attr,

	&dev_attr_corrected_bits.attr,

	&dev_attr_ecc_failures.attr,

	&dev_attr_bad_blocks.attr,

	&dev_attr_bbt_blocks.attr,

	&dev_attr_bitflip_threshold.attr,

	NULL,

};