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Commit 9df64c18 authored by Liangliang Lu's avatar Liangliang Lu Committed by Ram Prakash Gupta
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mmc: mmc-debugfs: Add debug fs entry for mmc driver 



This change adds support to allow user space query if low level eMMC
driver has encountered any error or not, this state can be read/cleared
via debugfs.

mmc: mmc-debugfs: add error statistics

This change adds support to allow user-space to query the number of
occurrence of the different type of errors that low-level mmc driver
has encountered. These stats can be read/cleared via debugfs.

mmc: debugfs: add debugfs entry to force raise host errors

The SDHC spec allows to force raise errors that is useful for
debugging error handler routines. Add debugfs entry force_error
to trigger host errors from userspace. Check SDHCI_SET_INT_ERROR
register for error bitmask info.

Usage: echo 0x1 > /sys/kernel/debug/mmcX/force_error
X - denotes the slot id

mmc: debugfs: fix unclocked register access by force_error

When echo values to debugfs entry force_error, unclocked
register access error would be detected. This change fixes
it by making sure the host is powered up and host clock is
ticking before access force event register for error
interrupt status.

mmc: core: Add a new debugfs entry.

Added a new debugfs entry to support for crashing
the system upon an error.
The default value of this debugfs entry is 'N'.
This  need to set true('Y'), to bugon upon an error.

Path to this debugfs entry to echo 'Y'/'N' is
/sys/kernel/debug/mmc0/crash_on_err for eMMC and
/sys/kernle/debug/mmc1/crash_on_err for SD card.

Change-Id: Ie7c79fb235b4882d73bb10193930418bd614ceaa
Signed-off-by: default avatarVenkat Gopalakrishnan <venkatg@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: default avatarCan Guo <cang@codeaurora.org>
Signed-off-by: default avatarLiangliang Lu <luliang@codeaurora.org>
Signed-off-by: default avatarSayali Lokhande <sayalil@codeaurora.org>
Signed-off-by: default avatarVeerabhadrarao Badiganti <vbadigan@codeaurora.org>
Signed-off-by: default avatarPradeep P V K <ppvk@codeaurora.org>
Signed-off-by: default avatarRam Prakash Gupta <rampraka@codeaurora.org>
parent 1aacdcf9

drivers/mmc/core/core.c

+1 −0
Original line number Diff line number Diff line
@@ -3565,6 +3565,7 @@ void mmc_rescan(struct work_struct *work) 
		if (freqs[i] <= host->f_min)

			break;

	}

	host->err_stats[MMC_ERR_CMD_TIMEOUT] = 0;

	mmc_release_host(host);



 out:

drivers/mmc/core/debugfs.c

+137 −0
Original line number Diff line number Diff line
@@ -310,6 +310,126 @@ static int mmc_max_clock_set(void *data, u64 val) 
DEFINE_SIMPLE_ATTRIBUTE(mmc_max_clock_fops, mmc_max_clock_get,

		mmc_max_clock_set, "%llu\n");



static int mmc_err_state_get(void *data, u64 *val)

{

	struct mmc_host *host = data;



	if (!host)

		return -EINVAL;



	*val = host->err_occurred ? 1 : 0;



	return 0;

}



static int mmc_err_state_clear(void *data, u64 val)

{

	struct mmc_host *host = data;



	if (!host)

		return -EINVAL;



	host->err_occurred = false;



	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get,

		mmc_err_state_clear, "%llu\n");



static int mmc_err_stats_show(struct seq_file *file, void *data)

{

	struct mmc_host *host = (struct mmc_host *)file->private;



	if (!host)

		return -EINVAL;



	seq_printf(file, "# Command Timeout Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_CMD_TIMEOUT]);



	seq_printf(file, "# Command CRC Errors Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_CMD_CRC]);



	seq_printf(file, "# Data Timeout Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_DAT_TIMEOUT]);



	seq_printf(file, "# Data CRC Errors Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_DAT_CRC]);



	seq_printf(file, "# Auto-Cmd Error Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_ADMA]);



	seq_printf(file, "# ADMA Error Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_ADMA]);



	seq_printf(file, "# Tuning Error Occurred:\t %d\n",

		   host->err_stats[MMC_ERR_TUNING]);



	seq_printf(file, "# CMDQ RED Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_RED]);



	seq_printf(file, "# CMDQ GCE Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_GCE]);



	seq_printf(file, "# CMDQ ICCE Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_ICCE]);



	seq_printf(file, "# Request Timedout:\t %d\n",

		   host->err_stats[MMC_ERR_REQ_TIMEOUT]);



	seq_printf(file, "# CMDQ Request Timedout:\t %d\n",

		   host->err_stats[MMC_ERR_CMDQ_REQ_TIMEOUT]);



	seq_printf(file, "# ICE Config Errors:\t\t %d\n",

		   host->err_stats[MMC_ERR_ICE_CFG]);

	return 0;

}



static int mmc_err_stats_open(struct inode *inode, struct file *file)

{

	return single_open(file, mmc_err_stats_show, inode->i_private);

}



static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf,

				   size_t cnt, loff_t *ppos)

{

	struct mmc_host *host = filp->f_mapping->host->i_private;



	if (!host)

		return -EINVAL;



	pr_debug("%s: Resetting MMC error statistics\n", __func__);

	memset(host->err_stats, 0, sizeof(host->err_stats));



	return cnt;

}



static const struct file_operations mmc_err_stats_fops = {

	.open	= mmc_err_stats_open,

	.read	= seq_read,

	.write	= mmc_err_stats_write,

};



static int mmc_force_err_set(void *data, u64 val)

{

	struct mmc_host *host = data;



	if (host && host->card && host->ops &&

			host->ops->force_err_irq) {

		/*

		 * To access the force error irq reg, we need to make

		 * sure the host is powered up and host clock is ticking.

		 */

		mmc_get_card(host->card, NULL);

		host->ops->force_err_irq(host, val);

		mmc_put_card(host->card, NULL);

	}



	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(mmc_force_err_fops, NULL, mmc_force_err_set, "%llu\n");



void mmc_add_host_debugfs(struct mmc_host *host)

{

	struct dentry *root;
@@ -351,6 +471,14 @@ void mmc_add_host_debugfs(struct mmc_host *host) 
		&host->clk_scaling.skip_clk_scale_freq_update))

		goto err_node;



	if (!debugfs_create_file("err_state", 0600, root, host,

		&mmc_err_state))

		goto err_node;



	if (!debugfs_create_file("err_stats", 0600, root, host,

		&mmc_err_stats_fops))

		goto err_node;



#ifdef CONFIG_FAIL_MMC_REQUEST

	if (fail_request)

		setup_fault_attr(&fail_default_attr, fail_request);
@@ -360,6 +488,15 @@ void mmc_add_host_debugfs(struct mmc_host *host) 
					     &host->fail_mmc_request)))

		goto err_node;

#endif

	if (!debugfs_create_file("force_error", 0200, root, host,

		&mmc_force_err_fops))

		goto err_node;



	if (!debugfs_create_bool("crash_on_err",

		0600, root,

		&host->crash_on_err))

		goto err_node;



	return;



err_node: