[PATCH V5 0/5] mmc: add error statistics for eMMC and SD card

[PATCH V5 0/5] mmc: add error statistics for eMMC and SD card

[Shaik Sajida Bhanu]

Changes since V4:
	- Defined new macro to increment err_stats members when error occured
	  as suggested by Adrain Hunter.
	- Called err_stats members increment function after printing the error
	  as suggested by Adrain Hunter.
	- Considered INDEX and END_BIT errors same as CRC errors as suggested
	  by Adrain Hunter.
	- Removed Null check for host in debug fs functions and Reordered
	  err_stats declarationas suggested by Adrain Hunter.
	- Removed err_state variable stuff and updated err_state debug fs entry
	  based on the err_stats members state as suggested by Adrain Hunter.

Changes since V3:
	- Dropped error stats feature flag as suggested by Adrain Hunter.
	- Separated error state related changes in separate patches as
	  suggested by Adrain Hunter.
	  [PATCH V4 4/7] : error state debug fs
	  [PATCH V4 5/7] : error state enable function
	  [PATCH V4 6/7] : error state enable in error case
	- Note: we are enabling error state before calling sdhci_dumpregs
	  we couldn't add the err state in error stats array as err state
	  is not error type.
	- Corrected Signed-off-by order as suggested by Bjron Andersson.
	- Moved error state enable code from sdhci_dumpregs to error
	  conditions as suggested by Adrain Hunter

Changes since V2:
	- Removed userspace error stats clear debug fs entry as suggested
	  by Adrain Hunter.
	- Split patch into 4 patches
	  [PATCH V3 1/4] : sdhci driver
	  [PATCH V3 2/4] : debug fs entries
	  [PATCH V3 3/4] : core driver
	  [PATCH V3 4/4] : cqhci driver
	- Used for loop to print error messages instead of using printf
	  statements for all error messages as suggested by Adrain Hunter.
	- Introduced one flag to enable error stats feature, if any other
	  client wants to use this feature, they need to enable that flag.
	- Moved reset command timeout error statement to card init flow
	  as suggested by Adrain Hunter.

Changes since V1:
	- Removed sysfs entry for eMMC and SD card error statistics and added
	  debugfs entry as suggested by Adrian Hunter and Ulf Hansson.

Shaik Sajida Bhanu (5):
  mmc: core: Capture eMMC and SD card errors
  mmc: sdhci: Capture eMMC and SD card errors
  mmc: debugfs: Add debug fs entry for mmc driver
  mmc: debugfs: Add debug fs error state entry for mmc driver
  mmc: cqhci: Capture eMMC and SD card errors

 drivers/mmc/core/core.c       |  6 ++++
 drivers/mmc/core/debugfs.c    | 81 +++++++++++++++++++++++++++++++++++++++++++
 drivers/mmc/host/cqhci-core.c |  9 ++++-
 drivers/mmc/host/sdhci.c      | 54 ++++++++++++++++++++++-------
 drivers/mmc/host/sdhci.h      |  3 ++
 include/linux/mmc/host.h      | 26 ++++++++++++++
 include/linux/mmc/mmc.h       |  6 ++++
 7 files changed, 171 insertions(+), 14 deletions(-)

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation

[PATCH V5 1/5] mmc: core: Capture eMMC and SD card errors

[Shaik Sajida Bhanu]

Add changes to capture eMMC and SD card errors.
This is useful for debug and testing.

Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
Signed-off-by: Ram Prakash Gupta <quic_rampraka@quicinc.com>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
---
 drivers/mmc/core/core.c  |  6 ++++++
 include/linux/mmc/host.h | 26 ++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 8cc2b74..6d086e9 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2247,6 +2247,12 @@ void mmc_rescan(struct work_struct *work)
 		if (freqs[i] <= host->f_min)
 			break;
 	}
+
+	/*
+	 * Ignore the command timeout errors observed during
+	 * the card init as those are excepted.
+	 */
+	host->err_stats[MMC_ERR_CMD_TIMEOUT] = 0;
 	mmc_release_host(host);
 
  out:
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c193c50..eb8bc5b 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -93,6 +93,25 @@ struct mmc_clk_phase_map {
 
 struct mmc_host;
 
+enum mmc_err_stat {
+	MMC_ERR_CMD_TIMEOUT,
+	MMC_ERR_CMD_CRC,
+	MMC_ERR_DAT_TIMEOUT,
+	MMC_ERR_DAT_CRC,
+	MMC_ERR_AUTO_CMD,
+	MMC_ERR_ADMA,
+	MMC_ERR_TUNING,
+	MMC_ERR_CMDQ_RED,
+	MMC_ERR_CMDQ_GCE,
+	MMC_ERR_CMDQ_ICCE,
+	MMC_ERR_REQ_TIMEOUT,
+	MMC_ERR_CMDQ_REQ_TIMEOUT,
+	MMC_ERR_ICE_CFG,
+	MMC_ERR_CTRL_TIMEOUT,
+	MMC_ERR_UNEXPECTED_IRQ,
+	MMC_ERR_MAX,
+};
+
 struct mmc_host_ops {
 	/*
 	 * It is optional for the host to implement pre_req and post_req in
@@ -501,6 +520,7 @@ struct mmc_host {
 	/* Host Software Queue support */
 	bool			hsq_enabled;
 
+	u32			err_stats[MMC_ERR_MAX];
 	unsigned long		private[] ____cacheline_aligned;
 };
 
@@ -635,6 +655,12 @@ static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data)
 	return data->flags & MMC_DATA_WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
 }
 
+static inline void mmc_debugfs_err_stats_inc(struct mmc_host *host,
+					     enum mmc_err_stat stat)
+{
+	host->err_stats[stat] += 1;
+}
+
 int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error);
 int mmc_send_abort_tuning(struct mmc_host *host, u32 opcode);
 int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd);
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation

[PATCH V5 2/5] mmc: sdhci: Capture eMMC and SD card errors

[Shaik Sajida Bhanu]

Add changes to capture eMMC and SD card errors.
This is useful for debug and testing.

Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
---
 drivers/mmc/host/sdhci.c | 54 ++++++++++++++++++++++++++++++++++++------------
 drivers/mmc/host/sdhci.h |  3 +++
 include/linux/mmc/mmc.h  |  6 ++++++
 3 files changed, 50 insertions(+), 13 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 2215202..1cda28ba 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -224,6 +224,7 @@ void sdhci_reset(struct sdhci_host *host, u8 mask)
 		if (timedout) {
 			pr_err("%s: Reset 0x%x never completed.\n",
 				mmc_hostname(host->mmc), (int)mask);
+			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
 			sdhci_dumpregs(host);
 			return;
 		}
@@ -1716,6 +1717,7 @@ static bool sdhci_send_command_retry(struct sdhci_host *host,
 		if (!timeout--) {
 			pr_err("%s: Controller never released inhibit bit(s).\n",
 			       mmc_hostname(host->mmc));
+			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
 			sdhci_dumpregs(host);
 			cmd->error = -EIO;
 			return false;
@@ -1965,6 +1967,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
 		if (timedout) {
 			pr_err("%s: Internal clock never stabilised.\n",
 			       mmc_hostname(host->mmc));
+			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
 			sdhci_dumpregs(host);
 			return;
 		}
@@ -1987,6 +1990,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
 			if (timedout) {
 				pr_err("%s: PLL clock never stabilised.\n",
 				       mmc_hostname(host->mmc));
+				sdhci_err_stats_inc(host, CTRL_TIMEOUT);
 				sdhci_dumpregs(host);
 				return;
 			}
@@ -3161,6 +3165,7 @@ static void sdhci_timeout_timer(struct timer_list *t)
 	if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
 		pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
 		       mmc_hostname(host->mmc));
+		sdhci_err_stats_inc(host, REQ_TIMEOUT);
 		sdhci_dumpregs(host);
 
 		host->cmd->error = -ETIMEDOUT;
@@ -3183,6 +3188,7 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
 	    (host->cmd && sdhci_data_line_cmd(host->cmd))) {
 		pr_err("%s: Timeout waiting for hardware interrupt.\n",
 		       mmc_hostname(host->mmc));
+		sdhci_err_stats_inc(host, REQ_TIMEOUT);
 		sdhci_dumpregs(host);
 
 		if (host->data) {
@@ -3234,17 +3240,21 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
 			return;
 		pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
 		       mmc_hostname(host->mmc), (unsigned)intmask);
+		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
 		sdhci_dumpregs(host);
 		return;
 	}
 
 	if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
 		       SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
-		if (intmask & SDHCI_INT_TIMEOUT)
+		if (intmask & SDHCI_INT_TIMEOUT) {
 			host->cmd->error = -ETIMEDOUT;
-		else
+			sdhci_err_stats_inc(host, CMD_TIMEOUT);
+		} else {
 			host->cmd->error = -EILSEQ;
-
+			if (!mmc_op_tuning(host->cmd->opcode))
+				sdhci_err_stats_inc(host, CMD_CRC);
+		}
 		/* Treat data command CRC error the same as data CRC error */
 		if (host->cmd->data &&
 		    (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
@@ -3266,6 +3276,8 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
 			  -ETIMEDOUT :
 			  -EILSEQ;
 
+		sdhci_err_stats_inc(host, AUTO_CMD);
+
 		if (sdhci_auto_cmd23(host, mrq)) {
 			mrq->sbc->error = err;
 			__sdhci_finish_mrq(host, mrq);
@@ -3342,6 +3354,7 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 			if (intmask & SDHCI_INT_DATA_TIMEOUT) {
 				host->data_cmd = NULL;
 				data_cmd->error = -ETIMEDOUT;
+				sdhci_err_stats_inc(host, CMD_TIMEOUT);
 				__sdhci_finish_mrq(host, data_cmd->mrq);
 				return;
 			}
@@ -3370,23 +3383,29 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 
 		pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
 		       mmc_hostname(host->mmc), (unsigned)intmask);
+		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
 		sdhci_dumpregs(host);
 
 		return;
 	}
 
-	if (intmask & SDHCI_INT_DATA_TIMEOUT)
+	if (intmask & SDHCI_INT_DATA_TIMEOUT) {
 		host->data->error = -ETIMEDOUT;
-	else if (intmask & SDHCI_INT_DATA_END_BIT)
+		sdhci_err_stats_inc(host, DAT_TIMEOUT);
+	} else if (intmask & SDHCI_INT_DATA_END_BIT)
 		host->data->error = -EILSEQ;
 	else if ((intmask & SDHCI_INT_DATA_CRC) &&
 		SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
-			!= MMC_BUS_TEST_R)
+			!= MMC_BUS_TEST_R) {
 		host->data->error = -EILSEQ;
+		if (!mmc_op_tuning(host->cmd->opcode))
+			sdhci_err_stats_inc(host, DAT_CRC);
+	}
 	else if (intmask & SDHCI_INT_ADMA_ERROR) {
 		pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
 		       intmask);
 		sdhci_adma_show_error(host);
+		sdhci_err_stats_inc(host, ADMA);
 		host->data->error = -EIO;
 		if (host->ops->adma_workaround)
 			host->ops->adma_workaround(host, intmask);
@@ -3584,6 +3603,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 	if (unexpected) {
 		pr_err("%s: Unexpected interrupt 0x%08x.\n",
 			   mmc_hostname(host->mmc), unexpected);
+		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
 		sdhci_dumpregs(host);
 	}
 
@@ -3905,20 +3925,27 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
 	if (!host->cqe_on)
 		return false;
 
-	if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
+	if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC)) {
 		*cmd_error = -EILSEQ;
-	else if (intmask & SDHCI_INT_TIMEOUT)
+		if (!mmc_op_tuning(host->cmd->opcode))
+			sdhci_err_stats_inc(host, CMD_CRC);
+	} else if (intmask & SDHCI_INT_TIMEOUT) {
 		*cmd_error = -ETIMEDOUT;
-	else
+		sdhci_err_stats_inc(host, CMD_TIMEOUT);
+	} else
 		*cmd_error = 0;
 
-	if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
+	if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) {
 		*data_error = -EILSEQ;
-	else if (intmask & SDHCI_INT_DATA_TIMEOUT)
+		if (!mmc_op_tuning(host->cmd->opcode))
+			sdhci_err_stats_inc(host, DAT_CRC);
+	} else if (intmask & SDHCI_INT_DATA_TIMEOUT) {
 		*data_error = -ETIMEDOUT;
-	else if (intmask & SDHCI_INT_ADMA_ERROR)
+		sdhci_err_stats_inc(host, DAT_TIMEOUT);
+	} else if (intmask & SDHCI_INT_ADMA_ERROR) {
 		*data_error = -EIO;
-	else
+		sdhci_err_stats_inc(host, ADMA);
+	} else
 		*data_error = 0;
 
 	/* Clear selected interrupts. */
@@ -3934,6 +3961,7 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
 		sdhci_writel(host, intmask, SDHCI_INT_STATUS);
 		pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
 		       mmc_hostname(host->mmc), intmask);
+		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
 		sdhci_dumpregs(host);
 	}
 
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index d7929d7..95a08f0 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -356,6 +356,9 @@ struct sdhci_adma2_64_desc {
  */
 #define MMC_CMD_TRANSFER_TIME	(10 * NSEC_PER_MSEC) /* max 10 ms */
 
+#define sdhci_err_stats_inc(host, err_name) \
+	mmc_debugfs_err_stats_inc((host)->mmc, MMC_ERR_##err_name)
+
 enum sdhci_cookie {
 	COOKIE_UNMAPPED,
 	COOKIE_PRE_MAPPED,	/* mapped by sdhci_pre_req() */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index d9a65c6..9c50bc4 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -99,6 +99,12 @@ static inline bool mmc_op_multi(u32 opcode)
 	       opcode == MMC_READ_MULTIPLE_BLOCK;
 }
 
+static inline bool mmc_op_tuning(u32 opcode)
+{
+	return opcode == MMC_SEND_TUNING_BLOCK ||
+			opcode == MMC_SEND_TUNING_BLOCK_HS200;
+}
+
 /*
  * MMC_SWITCH argument format:
  *
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation

[PATCH V5 3/5] mmc: debugfs: Add debug fs entry for mmc driver

[Shaik Sajida Bhanu]

Add debug fs entry to query eMMC and SD card errors statistics

Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
---
 drivers/mmc/core/debugfs.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 3fdbc80..6aa5a60 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -223,6 +223,59 @@ static int mmc_clock_opt_set(void *data, u64 val)
 DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
 	"%llu\n");
 
+static int mmc_err_stats_show(struct seq_file *file, void *data)
+{
+	struct mmc_host *host = (struct mmc_host *)file->private;
+	const char *desc[MMC_ERR_MAX] = {
+		[MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",
+		[MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred",
+		[MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred",
+		[MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred",
+		[MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred",
+		[MMC_ERR_ADMA] = "ADMA Error Occurred",
+		[MMC_ERR_TUNING] = "Tuning Error Occurred",
+		[MMC_ERR_CMDQ_RED] = "CMDQ RED Errors",
+		[MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors",
+		[MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors",
+		[MMC_ERR_REQ_TIMEOUT] = "Request Timedout",
+		[MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout",
+		[MMC_ERR_ICE_CFG] = "ICE Config Errors",
+		[MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors",
+		[MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors",
+	};
+	int i;
+
+	for (i = 0; i < MMC_ERR_MAX; i++) {
+		if (desc[i])
+			seq_printf(file, "# %s:\t %d\n",
+					desc[i], host->err_stats[i]);
+	}
+
+	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;
+
+	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,
+};
+
 void mmc_add_host_debugfs(struct mmc_host *host)
 {
 	struct dentry *root;
@@ -236,6 +289,9 @@ void mmc_add_host_debugfs(struct mmc_host *host)
 	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
 				   &mmc_clock_fops);
 
+	debugfs_create_file("err_stats", 0600, root, host,
+			    &mmc_err_stats_fops);
+
 #ifdef CONFIG_FAIL_MMC_REQUEST
 	if (fail_request)
 		setup_fault_attr(&fail_default_attr, fail_request);
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation

[PATCH V5 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

[Shaik Sajida Bhanu]

Add debug fs entry error state to query eMMC and SD card errors statistics.
If any errors occurred in eMMC and SD card driver level then
err_state value will be set to 1.

Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
---
 drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 6aa5a60..2f5b63f 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -222,6 +222,29 @@ static int mmc_clock_opt_set(void *data, u64 val)
 
 DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_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_stats[MMC_ERR_REQ_TIMEOUT] ||
+	       host->err_stats[MMC_ERR_ADMA] ||
+	       host->err_stats[MMC_ERR_CTRL_TIMEOUT] ||
+	       host->err_stats[MMC_ERR_UNEXPECTED_IRQ] ||
+	       host->err_stats[MMC_ERR_CMDQ_RED] ||
+	       host->err_stats[MMC_ERR_CMDQ_GCE] ||
+	       host->err_stats[MMC_ERR_CMDQ_ICCE] ||
+	       host->err_stats[MMC_ERR_DAT_TIMEOUT] ||
+	       host->err_stats[MMC_ERR_DAT_CRC] ||
+	       host->err_stats[MMC_ERR_CMD_CRC] ||
+	       host->err_stats[MMC_ERR_CMD_TIMEOUT];
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
 
 static int mmc_err_stats_show(struct seq_file *file, void *data)
 {
@@ -289,6 +312,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
 	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
 				   &mmc_clock_fops);
 
+	debugfs_create_file("err_state", 0600, root, host,
+			    &mmc_err_state);
 	debugfs_create_file("err_stats", 0600, root, host,
 			    &mmc_err_stats_fops);
 
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation

[PATCH V5 5/5] mmc: cqhci: Capture eMMC and SD card errors

[Shaik Sajida Bhanu]

Add changes to capture eMMC and SD card errors.
This is useful for debug and testing.

Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
Signed-off-by: Ram Prakash Gupta <quic_rampraka@quicinc.com>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
---
 drivers/mmc/host/cqhci-core.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
index b0d30c3..b3d7d6d 100644
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -822,8 +822,15 @@ irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
 	pr_debug("%s: cqhci: IRQ status: 0x%08x\n", mmc_hostname(mmc), status);
 
 	if ((status & (CQHCI_IS_RED | CQHCI_IS_GCE | CQHCI_IS_ICCE)) ||
-	    cmd_error || data_error)
+	    cmd_error || data_error) {
+		if (status & CQHCI_IS_RED)
+			mmc_debugfs_err_stats_inc(mmc, MMC_ERR_CMDQ_RED);
+		if (status & CQHCI_IS_GCE)
+			mmc_debugfs_err_stats_inc(mmc, MMC_ERR_CMDQ_GCE);
+		if (status & CQHCI_IS_ICCE)
+			mmc_debugfs_err_stats_inc(mmc, MMC_ERR_CMDQ_ICCE);
 		cqhci_error_irq(mmc, status, cmd_error, data_error);
+	}
 
 	if (status & CQHCI_IS_TCC) {
 		/* read TCN and complete the request */
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation

Re: [PATCH V5 2/5] mmc: sdhci: Capture eMMC and SD card errors

[Adrian Hunter]

On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
> Add changes to capture eMMC and SD card errors.
> This is useful for debug and testing.
> 
> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>

Looks good.  A couple of minor comments.

> ---
>  drivers/mmc/host/sdhci.c | 54 ++++++++++++++++++++++++++++++++++++------------
>  drivers/mmc/host/sdhci.h |  3 +++
>  include/linux/mmc/mmc.h  |  6 ++++++
>  3 files changed, 50 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 2215202..1cda28ba 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -224,6 +224,7 @@ void sdhci_reset(struct sdhci_host *host, u8 mask)
>  		if (timedout) {
>  			pr_err("%s: Reset 0x%x never completed.\n",
>  				mmc_hostname(host->mmc), (int)mask);
> +			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>  			sdhci_dumpregs(host);
>  			return;
>  		}
> @@ -1716,6 +1717,7 @@ static bool sdhci_send_command_retry(struct sdhci_host *host,
>  		if (!timeout--) {
>  			pr_err("%s: Controller never released inhibit bit(s).\n",
>  			       mmc_hostname(host->mmc));
> +			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>  			sdhci_dumpregs(host);
>  			cmd->error = -EIO;
>  			return false;
> @@ -1965,6 +1967,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
>  		if (timedout) {
>  			pr_err("%s: Internal clock never stabilised.\n",
>  			       mmc_hostname(host->mmc));
> +			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>  			sdhci_dumpregs(host);
>  			return;
>  		}
> @@ -1987,6 +1990,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
>  			if (timedout) {
>  				pr_err("%s: PLL clock never stabilised.\n",
>  				       mmc_hostname(host->mmc));
> +				sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>  				sdhci_dumpregs(host);
>  				return;
>  			}
> @@ -3161,6 +3165,7 @@ static void sdhci_timeout_timer(struct timer_list *t)
>  	if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
>  		pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
>  		       mmc_hostname(host->mmc));
> +		sdhci_err_stats_inc(host, REQ_TIMEOUT);
>  		sdhci_dumpregs(host);
>  
>  		host->cmd->error = -ETIMEDOUT;
> @@ -3183,6 +3188,7 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
>  	    (host->cmd && sdhci_data_line_cmd(host->cmd))) {
>  		pr_err("%s: Timeout waiting for hardware interrupt.\n",
>  		       mmc_hostname(host->mmc));
> +		sdhci_err_stats_inc(host, REQ_TIMEOUT);
>  		sdhci_dumpregs(host);
>  
>  		if (host->data) {
> @@ -3234,17 +3240,21 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
>  			return;
>  		pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
>  		       mmc_hostname(host->mmc), (unsigned)intmask);
> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>  		sdhci_dumpregs(host);
>  		return;
>  	}
>  
>  	if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
>  		       SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
> -		if (intmask & SDHCI_INT_TIMEOUT)
> +		if (intmask & SDHCI_INT_TIMEOUT) {
>  			host->cmd->error = -ETIMEDOUT;
> -		else
> +			sdhci_err_stats_inc(host, CMD_TIMEOUT);
> +		} else {
>  			host->cmd->error = -EILSEQ;
> -
> +			if (!mmc_op_tuning(host->cmd->opcode))
> +				sdhci_err_stats_inc(host, CMD_CRC);
> +		}
>  		/* Treat data command CRC error the same as data CRC error */
>  		if (host->cmd->data &&
>  		    (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
> @@ -3266,6 +3276,8 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
>  			  -ETIMEDOUT :
>  			  -EILSEQ;
>  
> +		sdhci_err_stats_inc(host, AUTO_CMD);
> +
>  		if (sdhci_auto_cmd23(host, mrq)) {
>  			mrq->sbc->error = err;
>  			__sdhci_finish_mrq(host, mrq);
> @@ -3342,6 +3354,7 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
>  			if (intmask & SDHCI_INT_DATA_TIMEOUT) {
>  				host->data_cmd = NULL;
>  				data_cmd->error = -ETIMEDOUT;
> +				sdhci_err_stats_inc(host, CMD_TIMEOUT);
>  				__sdhci_finish_mrq(host, data_cmd->mrq);
>  				return;
>  			}
> @@ -3370,23 +3383,29 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
>  
>  		pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
>  		       mmc_hostname(host->mmc), (unsigned)intmask);
> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>  		sdhci_dumpregs(host);
>  
>  		return;
>  	}
>  
> -	if (intmask & SDHCI_INT_DATA_TIMEOUT)
> +	if (intmask & SDHCI_INT_DATA_TIMEOUT) {
>  		host->data->error = -ETIMEDOUT;
> -	else if (intmask & SDHCI_INT_DATA_END_BIT)
> +		sdhci_err_stats_inc(host, DAT_TIMEOUT);
> +	} else if (intmask & SDHCI_INT_DATA_END_BIT)
>  		host->data->error = -EILSEQ;

Seems to be missing here:

		sdhci_err_stats_inc(host, DAT_CRC);

Also it would be nice to have braces {} on all arms of if-else-if
Can use checkpatch.pl --strict to see where

>  	else if ((intmask & SDHCI_INT_DATA_CRC) &&
>  		SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
> -			!= MMC_BUS_TEST_R)
> +			!= MMC_BUS_TEST_R) {
>  		host->data->error = -EILSEQ;
> +		if (!mmc_op_tuning(host->cmd->opcode))
> +			sdhci_err_stats_inc(host, DAT_CRC);
> +	}
>  	else if (intmask & SDHCI_INT_ADMA_ERROR) {
>  		pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
>  		       intmask);
>  		sdhci_adma_show_error(host);
> +		sdhci_err_stats_inc(host, ADMA);
>  		host->data->error = -EIO;
>  		if (host->ops->adma_workaround)
>  			host->ops->adma_workaround(host, intmask);
> @@ -3584,6 +3603,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
>  	if (unexpected) {
>  		pr_err("%s: Unexpected interrupt 0x%08x.\n",
>  			   mmc_hostname(host->mmc), unexpected);
> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>  		sdhci_dumpregs(host);
>  	}
>  
> @@ -3905,20 +3925,27 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
>  	if (!host->cqe_on)
>  		return false;
>  
> -	if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
> +	if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC)) {
>  		*cmd_error = -EILSEQ;
> -	else if (intmask & SDHCI_INT_TIMEOUT)
> +		if (!mmc_op_tuning(host->cmd->opcode))
> +			sdhci_err_stats_inc(host, CMD_CRC);
> +	} else if (intmask & SDHCI_INT_TIMEOUT) {
>  		*cmd_error = -ETIMEDOUT;
> -	else
> +		sdhci_err_stats_inc(host, CMD_TIMEOUT);
> +	} else
>  		*cmd_error = 0;
>  
> -	if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
> +	if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) {
>  		*data_error = -EILSEQ;
> -	else if (intmask & SDHCI_INT_DATA_TIMEOUT)
> +		if (!mmc_op_tuning(host->cmd->opcode))
> +			sdhci_err_stats_inc(host, DAT_CRC);
> +	} else if (intmask & SDHCI_INT_DATA_TIMEOUT) {
>  		*data_error = -ETIMEDOUT;
> -	else if (intmask & SDHCI_INT_ADMA_ERROR)
> +		sdhci_err_stats_inc(host, DAT_TIMEOUT);
> +	} else if (intmask & SDHCI_INT_ADMA_ERROR) {
>  		*data_error = -EIO;
> -	else
> +		sdhci_err_stats_inc(host, ADMA);
> +	} else
>  		*data_error = 0;
>  
>  	/* Clear selected interrupts. */
> @@ -3934,6 +3961,7 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
>  		sdhci_writel(host, intmask, SDHCI_INT_STATUS);
>  		pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
>  		       mmc_hostname(host->mmc), intmask);
> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>  		sdhci_dumpregs(host);
>  	}
>  
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index d7929d7..95a08f0 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -356,6 +356,9 @@ struct sdhci_adma2_64_desc {
>   */
>  #define MMC_CMD_TRANSFER_TIME	(10 * NSEC_PER_MSEC) /* max 10 ms */
>  
> +#define sdhci_err_stats_inc(host, err_name) \
> +	mmc_debugfs_err_stats_inc((host)->mmc, MMC_ERR_##err_name)
> +
>  enum sdhci_cookie {
>  	COOKIE_UNMAPPED,
>  	COOKIE_PRE_MAPPED,	/* mapped by sdhci_pre_req() */
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index d9a65c6..9c50bc4 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -99,6 +99,12 @@ static inline bool mmc_op_multi(u32 opcode)
>  	       opcode == MMC_READ_MULTIPLE_BLOCK;
>  }
>  
> +static inline bool mmc_op_tuning(u32 opcode)
> +{
> +	return opcode == MMC_SEND_TUNING_BLOCK ||
> +			opcode == MMC_SEND_TUNING_BLOCK_HS200;
> +}
> +
>  /*
>   * MMC_SWITCH argument format:
>   *

There does not seem to be any:

	sdhci_err_stats_inc(host, TUNING);

MMC_ERR_TUNING does not seem to get used.

Re: [PATCH V5 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

[Adrian Hunter]

On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
> Add debug fs entry error state to query eMMC and SD card errors statistics.
> If any errors occurred in eMMC and SD card driver level then
> err_state value will be set to 1.
> 
> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
> ---
>  drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
> index 6aa5a60..2f5b63f 100644
> --- a/drivers/mmc/core/debugfs.c
> +++ b/drivers/mmc/core/debugfs.c
> @@ -222,6 +222,29 @@ static int mmc_clock_opt_set(void *data, u64 val)
>  
>  DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
>  	"%llu\n");

A blank line would be nice here

> +static int mmc_err_state_get(void *data, u64 *val)
> +{
> +	struct mmc_host *host = data;
> +
> +	if (!host)
> +		return -EINVAL;
> +

I am not sure why you have left out some err_stats[].
Why not all of them?  At least, it needs a comment to explain.

> +	*val = host->err_stats[MMC_ERR_REQ_TIMEOUT] ||
> +	       host->err_stats[MMC_ERR_ADMA] ||
> +	       host->err_stats[MMC_ERR_CTRL_TIMEOUT] ||
> +	       host->err_stats[MMC_ERR_UNEXPECTED_IRQ] ||
> +	       host->err_stats[MMC_ERR_CMDQ_RED] ||
> +	       host->err_stats[MMC_ERR_CMDQ_GCE] ||
> +	       host->err_stats[MMC_ERR_CMDQ_ICCE] ||
> +	       host->err_stats[MMC_ERR_DAT_TIMEOUT] ||
> +	       host->err_stats[MMC_ERR_DAT_CRC] ||
> +	       host->err_stats[MMC_ERR_CMD_CRC] ||
> +	       host->err_stats[MMC_ERR_CMD_TIMEOUT];
> +
> +	return 0;
> +}
> +
> +DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
>  
>  static int mmc_err_stats_show(struct seq_file *file, void *data)
>  {
> @@ -289,6 +312,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
>  	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
>  				   &mmc_clock_fops);
>  
> +	debugfs_create_file("err_state", 0600, root, host,
> +			    &mmc_err_state);
>  	debugfs_create_file("err_stats", 0600, root, host,
>  			    &mmc_err_stats_fops);
>  

Re: [PATCH V5 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

[Adrian Hunter]

On 26/04/22 10:54, Adrian Hunter wrote:
> On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
>> Add debug fs entry error state to query eMMC and SD card errors statistics.
>> If any errors occurred in eMMC and SD card driver level then
>> err_state value will be set to 1.
>>
>> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
>> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
>> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
>> ---
>>  drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
>>  1 file changed, 25 insertions(+)
>>
>> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
>> index 6aa5a60..2f5b63f 100644
>> --- a/drivers/mmc/core/debugfs.c
>> +++ b/drivers/mmc/core/debugfs.c
>> @@ -222,6 +222,29 @@ static int mmc_clock_opt_set(void *data, u64 val)
>>  
>>  DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
>>  	"%llu\n");
> 
> A blank line would be nice here
> 
>> +static int mmc_err_state_get(void *data, u64 *val)
>> +{
>> +	struct mmc_host *host = data;
>> +
>> +	if (!host)
>> +		return -EINVAL;
>> +
> 
> I am not sure why you have left out some err_stats[].
> Why not all of them?  At least, it needs a comment to explain.
> 
>> +	*val = host->err_stats[MMC_ERR_REQ_TIMEOUT] ||
>> +	       host->err_stats[MMC_ERR_ADMA] ||
>> +	       host->err_stats[MMC_ERR_CTRL_TIMEOUT] ||
>> +	       host->err_stats[MMC_ERR_UNEXPECTED_IRQ] ||
>> +	       host->err_stats[MMC_ERR_CMDQ_RED] ||
>> +	       host->err_stats[MMC_ERR_CMDQ_GCE] ||
>> +	       host->err_stats[MMC_ERR_CMDQ_ICCE] ||
>> +	       host->err_stats[MMC_ERR_DAT_TIMEOUT] ||
>> +	       host->err_stats[MMC_ERR_DAT_CRC] ||
>> +	       host->err_stats[MMC_ERR_CMD_CRC] ||
>> +	       host->err_stats[MMC_ERR_CMD_TIMEOUT];
>> +
>> +	return 0;
>> +}
>> +
>> +DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");

Also, if possible, please use DEFINE_DEBUGFS_ATTRIBUTE / debugfs_create_file_unsafe
in this case

>>  
>>  static int mmc_err_stats_show(struct seq_file *file, void *data)
>>  {
>> @@ -289,6 +312,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
>>  	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
>>  				   &mmc_clock_fops);
>>  
>> +	debugfs_create_file("err_state", 0600, root, host,
>> +			    &mmc_err_state);
>>  	debugfs_create_file("err_stats", 0600, root, host,
>>  			    &mmc_err_stats_fops);
>>  
> 

Re: [PATCH V5 2/5] mmc: sdhci: Capture eMMC and SD card errors

[Sajida Bhanu (Temp)]

Hi,

Thank you for the review.

Please find the review comments.

Thanks,

Sajida

On 4/26/2022 1:21 PM, Adrian Hunter wrote:
> On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
>> Add changes to capture eMMC and SD card errors.
>> This is useful for debug and testing.
>>
>> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
>> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
>> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
> Looks good.  A couple of minor comments.
Thank you
>
>> ---
>>   drivers/mmc/host/sdhci.c | 54 ++++++++++++++++++++++++++++++++++++------------
>>   drivers/mmc/host/sdhci.h |  3 +++
>>   include/linux/mmc/mmc.h  |  6 ++++++
>>   3 files changed, 50 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index 2215202..1cda28ba 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -224,6 +224,7 @@ void sdhci_reset(struct sdhci_host *host, u8 mask)
>>   		if (timedout) {
>>   			pr_err("%s: Reset 0x%x never completed.\n",
>>   				mmc_hostname(host->mmc), (int)mask);
>> +			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>>   			sdhci_dumpregs(host);
>>   			return;
>>   		}
>> @@ -1716,6 +1717,7 @@ static bool sdhci_send_command_retry(struct sdhci_host *host,
>>   		if (!timeout--) {
>>   			pr_err("%s: Controller never released inhibit bit(s).\n",
>>   			       mmc_hostname(host->mmc));
>> +			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>>   			sdhci_dumpregs(host);
>>   			cmd->error = -EIO;
>>   			return false;
>> @@ -1965,6 +1967,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
>>   		if (timedout) {
>>   			pr_err("%s: Internal clock never stabilised.\n",
>>   			       mmc_hostname(host->mmc));
>> +			sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>>   			sdhci_dumpregs(host);
>>   			return;
>>   		}
>> @@ -1987,6 +1990,7 @@ void sdhci_enable_clk(struct sdhci_host *host, u16 clk)
>>   			if (timedout) {
>>   				pr_err("%s: PLL clock never stabilised.\n",
>>   				       mmc_hostname(host->mmc));
>> +				sdhci_err_stats_inc(host, CTRL_TIMEOUT);
>>   				sdhci_dumpregs(host);
>>   				return;
>>   			}
>> @@ -3161,6 +3165,7 @@ static void sdhci_timeout_timer(struct timer_list *t)
>>   	if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
>>   		pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
>>   		       mmc_hostname(host->mmc));
>> +		sdhci_err_stats_inc(host, REQ_TIMEOUT);
>>   		sdhci_dumpregs(host);
>>   
>>   		host->cmd->error = -ETIMEDOUT;
>> @@ -3183,6 +3188,7 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
>>   	    (host->cmd && sdhci_data_line_cmd(host->cmd))) {
>>   		pr_err("%s: Timeout waiting for hardware interrupt.\n",
>>   		       mmc_hostname(host->mmc));
>> +		sdhci_err_stats_inc(host, REQ_TIMEOUT);
>>   		sdhci_dumpregs(host);
>>   
>>   		if (host->data) {
>> @@ -3234,17 +3240,21 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
>>   			return;
>>   		pr_err("%s: Got command interrupt 0x%08x even though no command operation was in progress.\n",
>>   		       mmc_hostname(host->mmc), (unsigned)intmask);
>> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>>   		sdhci_dumpregs(host);
>>   		return;
>>   	}
>>   
>>   	if (intmask & (SDHCI_INT_TIMEOUT | SDHCI_INT_CRC |
>>   		       SDHCI_INT_END_BIT | SDHCI_INT_INDEX)) {
>> -		if (intmask & SDHCI_INT_TIMEOUT)
>> +		if (intmask & SDHCI_INT_TIMEOUT) {
>>   			host->cmd->error = -ETIMEDOUT;
>> -		else
>> +			sdhci_err_stats_inc(host, CMD_TIMEOUT);
>> +		} else {
>>   			host->cmd->error = -EILSEQ;
>> -
>> +			if (!mmc_op_tuning(host->cmd->opcode))
>> +				sdhci_err_stats_inc(host, CMD_CRC);
>> +		}
>>   		/* Treat data command CRC error the same as data CRC error */
>>   		if (host->cmd->data &&
>>   		    (intmask & (SDHCI_INT_CRC | SDHCI_INT_TIMEOUT)) ==
>> @@ -3266,6 +3276,8 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
>>   			  -ETIMEDOUT :
>>   			  -EILSEQ;
>>   
>> +		sdhci_err_stats_inc(host, AUTO_CMD);
>> +
>>   		if (sdhci_auto_cmd23(host, mrq)) {
>>   			mrq->sbc->error = err;
>>   			__sdhci_finish_mrq(host, mrq);
>> @@ -3342,6 +3354,7 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
>>   			if (intmask & SDHCI_INT_DATA_TIMEOUT) {
>>   				host->data_cmd = NULL;
>>   				data_cmd->error = -ETIMEDOUT;
>> +				sdhci_err_stats_inc(host, CMD_TIMEOUT);
>>   				__sdhci_finish_mrq(host, data_cmd->mrq);
>>   				return;
>>   			}
>> @@ -3370,23 +3383,29 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
>>   
>>   		pr_err("%s: Got data interrupt 0x%08x even though no data operation was in progress.\n",
>>   		       mmc_hostname(host->mmc), (unsigned)intmask);
>> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>>   		sdhci_dumpregs(host);
>>   
>>   		return;
>>   	}
>>   
>> -	if (intmask & SDHCI_INT_DATA_TIMEOUT)
>> +	if (intmask & SDHCI_INT_DATA_TIMEOUT) {
>>   		host->data->error = -ETIMEDOUT;
>> -	else if (intmask & SDHCI_INT_DATA_END_BIT)
>> +		sdhci_err_stats_inc(host, DAT_TIMEOUT);
>> +	} else if (intmask & SDHCI_INT_DATA_END_BIT)
>>   		host->data->error = -EILSEQ;
> Seems to be missing here:
>
> 		sdhci_err_stats_inc(host, DAT_CRC);
>
> Also it would be nice to have braces {} on all arms of if-else-if
> Can use checkpatch.pl --strict to see where
Sure Thank you
>
>>   	else if ((intmask & SDHCI_INT_DATA_CRC) &&
>>   		SDHCI_GET_CMD(sdhci_readw(host, SDHCI_COMMAND))
>> -			!= MMC_BUS_TEST_R)
>> +			!= MMC_BUS_TEST_R) {
>>   		host->data->error = -EILSEQ;
>> +		if (!mmc_op_tuning(host->cmd->opcode))
>> +			sdhci_err_stats_inc(host, DAT_CRC);
>> +	}
>>   	else if (intmask & SDHCI_INT_ADMA_ERROR) {
>>   		pr_err("%s: ADMA error: 0x%08x\n", mmc_hostname(host->mmc),
>>   		       intmask);
>>   		sdhci_adma_show_error(host);
>> +		sdhci_err_stats_inc(host, ADMA);
>>   		host->data->error = -EIO;
>>   		if (host->ops->adma_workaround)
>>   			host->ops->adma_workaround(host, intmask);
>> @@ -3584,6 +3603,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
>>   	if (unexpected) {
>>   		pr_err("%s: Unexpected interrupt 0x%08x.\n",
>>   			   mmc_hostname(host->mmc), unexpected);
>> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>>   		sdhci_dumpregs(host);
>>   	}
>>   
>> @@ -3905,20 +3925,27 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
>>   	if (!host->cqe_on)
>>   		return false;
>>   
>> -	if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC))
>> +	if (intmask & (SDHCI_INT_INDEX | SDHCI_INT_END_BIT | SDHCI_INT_CRC)) {
>>   		*cmd_error = -EILSEQ;
>> -	else if (intmask & SDHCI_INT_TIMEOUT)
>> +		if (!mmc_op_tuning(host->cmd->opcode))
>> +			sdhci_err_stats_inc(host, CMD_CRC);
>> +	} else if (intmask & SDHCI_INT_TIMEOUT) {
>>   		*cmd_error = -ETIMEDOUT;
>> -	else
>> +		sdhci_err_stats_inc(host, CMD_TIMEOUT);
>> +	} else
>>   		*cmd_error = 0;
>>   
>> -	if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC))
>> +	if (intmask & (SDHCI_INT_DATA_END_BIT | SDHCI_INT_DATA_CRC)) {
>>   		*data_error = -EILSEQ;
>> -	else if (intmask & SDHCI_INT_DATA_TIMEOUT)
>> +		if (!mmc_op_tuning(host->cmd->opcode))
>> +			sdhci_err_stats_inc(host, DAT_CRC);
>> +	} else if (intmask & SDHCI_INT_DATA_TIMEOUT) {
>>   		*data_error = -ETIMEDOUT;
>> -	else if (intmask & SDHCI_INT_ADMA_ERROR)
>> +		sdhci_err_stats_inc(host, DAT_TIMEOUT);
>> +	} else if (intmask & SDHCI_INT_ADMA_ERROR) {
>>   		*data_error = -EIO;
>> -	else
>> +		sdhci_err_stats_inc(host, ADMA);
>> +	} else
>>   		*data_error = 0;
>>   
>>   	/* Clear selected interrupts. */
>> @@ -3934,6 +3961,7 @@ bool sdhci_cqe_irq(struct sdhci_host *host, u32 intmask, int *cmd_error,
>>   		sdhci_writel(host, intmask, SDHCI_INT_STATUS);
>>   		pr_err("%s: CQE: Unexpected interrupt 0x%08x.\n",
>>   		       mmc_hostname(host->mmc), intmask);
>> +		sdhci_err_stats_inc(host, UNEXPECTED_IRQ);
>>   		sdhci_dumpregs(host);
>>   	}
>>   
>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>> index d7929d7..95a08f0 100644
>> --- a/drivers/mmc/host/sdhci.h
>> +++ b/drivers/mmc/host/sdhci.h
>> @@ -356,6 +356,9 @@ struct sdhci_adma2_64_desc {
>>    */
>>   #define MMC_CMD_TRANSFER_TIME	(10 * NSEC_PER_MSEC) /* max 10 ms */
>>   
>> +#define sdhci_err_stats_inc(host, err_name) \
>> +	mmc_debugfs_err_stats_inc((host)->mmc, MMC_ERR_##err_name)
>> +
>>   enum sdhci_cookie {
>>   	COOKIE_UNMAPPED,
>>   	COOKIE_PRE_MAPPED,	/* mapped by sdhci_pre_req() */
>> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
>> index d9a65c6..9c50bc4 100644
>> --- a/include/linux/mmc/mmc.h
>> +++ b/include/linux/mmc/mmc.h
>> @@ -99,6 +99,12 @@ static inline bool mmc_op_multi(u32 opcode)
>>   	       opcode == MMC_READ_MULTIPLE_BLOCK;
>>   }
>>   
>> +static inline bool mmc_op_tuning(u32 opcode)
>> +{
>> +	return opcode == MMC_SEND_TUNING_BLOCK ||
>> +			opcode == MMC_SEND_TUNING_BLOCK_HS200;
>> +}
>> +
>>   /*
>>    * MMC_SWITCH argument format:
>>    *
> There does not seem to be any:
>
> 	sdhci_err_stats_inc(host, TUNING);
>
> MMC_ERR_TUNING does not seem to get used.

Yes... Thank you for pointing.

We need to update this, will update this in patch set.

Re: [PATCH V5 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

[Sajida Bhanu (Temp)]

Hi,

Thank you for review.

Please find the inline comments.

Thanks,

Sajida

On 4/26/2022 1:28 PM, Adrian Hunter wrote:
> On 26/04/22 10:54, Adrian Hunter wrote:
>> On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
>>> Add debug fs entry error state to query eMMC and SD card errors statistics.
>>> If any errors occurred in eMMC and SD card driver level then
>>> err_state value will be set to 1.
>>>
>>> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
>>> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
>>> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
>>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
>>> ---
>>>   drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
>>>   1 file changed, 25 insertions(+)
>>>
>>> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
>>> index 6aa5a60..2f5b63f 100644
>>> --- a/drivers/mmc/core/debugfs.c
>>> +++ b/drivers/mmc/core/debugfs.c
>>> @@ -222,6 +222,29 @@ static int mmc_clock_opt_set(void *data, u64 val)
>>>   
>>>   DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
>>>   	"%llu\n");
>> A blank line would be nice here
>>
>>> +static int mmc_err_state_get(void *data, u64 *val)
>>> +{
>>> +	struct mmc_host *host = data;
>>> +
>>> +	if (!host)
>>> +		return -EINVAL;
>>> +
>> I am not sure why you have left out some err_stats[].
>> Why not all of them?  At least, it needs a comment to explain.
>>
>>> +	*val = host->err_stats[MMC_ERR_REQ_TIMEOUT] ||
>>> +	       host->err_stats[MMC_ERR_ADMA] ||
>>> +	       host->err_stats[MMC_ERR_CTRL_TIMEOUT] ||
>>> +	       host->err_stats[MMC_ERR_UNEXPECTED_IRQ] ||
>>> +	       host->err_stats[MMC_ERR_CMDQ_RED] ||
>>> +	       host->err_stats[MMC_ERR_CMDQ_GCE] ||
>>> +	       host->err_stats[MMC_ERR_CMDQ_ICCE] ||
>>> +	       host->err_stats[MMC_ERR_DAT_TIMEOUT] ||
>>> +	       host->err_stats[MMC_ERR_DAT_CRC] ||
>>> +	       host->err_stats[MMC_ERR_CMD_CRC] ||
>>> +	       host->err_stats[MMC_ERR_CMD_TIMEOUT];
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
> Also, if possible, please use DEFINE_DEBUGFS_ATTRIBUTE / debugfs_create_file_unsafe
> in this case
Sure.. will use  DEFINE_DEBUGFS_ATTRIBUTE
>
>>>   
>>>   static int mmc_err_stats_show(struct seq_file *file, void *data)
>>>   {
>>> @@ -289,6 +312,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
>>>   	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
>>>   				   &mmc_clock_fops);
>>>   
>>> +	debugfs_create_file("err_state", 0600, root, host,
>>> +			    &mmc_err_state);
>>>   	debugfs_create_file("err_stats", 0600, root, host,
>>>   			    &mmc_err_stats_fops);
>>>   

Re: [PATCH V5 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

[Adrian Hunter]

On 9/05/22 12:42, Sajida Bhanu (Temp) wrote:
> Hi,
> 
> Thank you for the review.
> 
> Please find the inline comments.
> 
> Thanks,
> 
> Sajida
> 
> On 4/26/2022 1:24 PM, Adrian Hunter wrote:
> 
>> On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
>>> Add debug fs entry error state to query eMMC and SD card errors statistics.
>>> If any errors occurred in eMMC and SD card driver level then
>>> err_state value will be set to 1.
>>>
>>> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
>>> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
>>> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
>>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
>>> ---
>>>  drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
>>>  1 file changed, 25 insertions(+)
>>>
>>> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
>>> index 6aa5a60..2f5b63f 100644
>>> --- a/drivers/mmc/core/debugfs.c
>>> +++ b/drivers/mmc/core/debugfs.c
>>> @@ -222,6 +222,29 @@ static int mmc_clock_opt_set(void *data, u64 val)
>>>  
>>>  DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
>>>  	"%llu\n");
>> A blank line would be nice here
> Sure
>>> +static int mmc_err_state_get(void *data, u64 *val)
>>> +{
>>> +	struct mmc_host *host = data;
>>> +
>>> +	if (!host)
>>> +		return -EINVAL;
>>> +
>> I am not sure why you have left out some err_stats[].
>> Why not all of them?  At least, it needs a comment to explain.
> 
> MMC_ERR_ICE_CFG --> we don't have ICE config.

So err_stats[MMC_ERR_ICE_CFG]  would be zero and make
no difference.

If you are going to check all then you could loop
through them

	*val = 0;
	for (i = 0; i < MMC_ERR_MAX; i++) {
		if (host->err_stats[i]) {
			*val = 1;
			break;
		}
	}

> 
> Remaining we need to update, Thank you for pointing.
> 
>>> +	*val = host->err_stats[MMC_ERR_REQ_TIMEOUT] ||
>>> +	       host->err_stats[MMC_ERR_ADMA] ||
>>> +	       host->err_stats[MMC_ERR_CTRL_TIMEOUT] ||
>>> +	       host->err_stats[MMC_ERR_UNEXPECTED_IRQ] ||
>>> +	       host->err_stats[MMC_ERR_CMDQ_RED] ||
>>> +	       host->err_stats[MMC_ERR_CMDQ_GCE] ||
>>> +	       host->err_stats[MMC_ERR_CMDQ_ICCE] ||
>>> +	       host->err_stats[MMC_ERR_DAT_TIMEOUT] ||
>>> +	       host->err_stats[MMC_ERR_DAT_CRC] ||
>>> +	       host->err_stats[MMC_ERR_CMD_CRC] ||
>>> +	       host->err_stats[MMC_ERR_CMD_TIMEOUT];
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
>>>  
>>>  static int mmc_err_stats_show(struct seq_file *file, void *data)
>>>  {
>>> @@ -289,6 +312,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
>>>  	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
>>>  				   &mmc_clock_fops);
>>>  
>>> +	debugfs_create_file("err_state", 0600, root, host,
>>> +			    &mmc_err_state);
>>>  	debugfs_create_file("err_stats", 0600, root, host,
>>>  			    &mmc_err_stats_fops);
>>>  

Re: [PATCH V5 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

[Sajida Bhanu (Temp)]

On 5/9/2022 3:33 PM, Adrian Hunter wrote:
> On 9/05/22 12:42, Sajida Bhanu (Temp) wrote:
>> Hi,
>>
>> Thank you for the review.
>>
>> Please find the inline comments.
>>
>> Thanks,
>>
>> Sajida
>>
>> On 4/26/2022 1:24 PM, Adrian Hunter wrote:
>>
>>> On 25/04/22 19:00, Shaik Sajida Bhanu wrote:
>>>> Add debug fs entry error state to query eMMC and SD card errors statistics.
>>>> If any errors occurred in eMMC and SD card driver level then
>>>> err_state value will be set to 1.
>>>>
>>>> Signed-off-by: Liangliang Lu <quic_luliang@quicinc.com>
>>>> Signed-off-by: Sayali Lokhande <quic_sayalil@quicinc.com>
>>>> Signed-off-by: Bao D. Nguyen <quic_nguyenb@quicinc.com>
>>>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
>>>> ---
>>>>   drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
>>>>   1 file changed, 25 insertions(+)
>>>>
>>>> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
>>>> index 6aa5a60..2f5b63f 100644
>>>> --- a/drivers/mmc/core/debugfs.c
>>>> +++ b/drivers/mmc/core/debugfs.c
>>>> @@ -222,6 +222,29 @@ static int mmc_clock_opt_set(void *data, u64 val)
>>>>   
>>>>   DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
>>>>   	"%llu\n");
>>> A blank line would be nice here
>> Sure
>>>> +static int mmc_err_state_get(void *data, u64 *val)
>>>> +{
>>>> +	struct mmc_host *host = data;
>>>> +
>>>> +	if (!host)
>>>> +		return -EINVAL;
>>>> +
>>> I am not sure why you have left out some err_stats[].
>>> Why not all of them?  At least, it needs a comment to explain.
>> MMC_ERR_ICE_CFG --> we don't have ICE config.
> So err_stats[MMC_ERR_ICE_CFG]  would be zero and make
> no difference.
>
> If you are going to check all then you could loop
> through them
>
> 	*val = 0;
> 	for (i = 0; i < MMC_ERR_MAX; i++) {
> 		if (host->err_stats[i]) {
> 			*val = 1;
> 			break;
> 		}
> 	}
Sure Thanks
>> Remaining we need to update, Thank you for pointing.
>>
>>>> +	*val = host->err_stats[MMC_ERR_REQ_TIMEOUT] ||
>>>> +	       host->err_stats[MMC_ERR_ADMA] ||
>>>> +	       host->err_stats[MMC_ERR_CTRL_TIMEOUT] ||
>>>> +	       host->err_stats[MMC_ERR_UNEXPECTED_IRQ] ||
>>>> +	       host->err_stats[MMC_ERR_CMDQ_RED] ||
>>>> +	       host->err_stats[MMC_ERR_CMDQ_GCE] ||
>>>> +	       host->err_stats[MMC_ERR_CMDQ_ICCE] ||
>>>> +	       host->err_stats[MMC_ERR_DAT_TIMEOUT] ||
>>>> +	       host->err_stats[MMC_ERR_DAT_CRC] ||
>>>> +	       host->err_stats[MMC_ERR_CMD_CRC] ||
>>>> +	       host->err_stats[MMC_ERR_CMD_TIMEOUT];
>>>> +
>>>> +	return 0;
>>>> +}
>>>> +
>>>> +DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
>>>>   
>>>>   static int mmc_err_stats_show(struct seq_file *file, void *data)
>>>>   {
>>>> @@ -289,6 +312,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
>>>>   	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
>>>>   				   &mmc_clock_fops);
>>>>   
>>>> +	debugfs_create_file("err_state", 0600, root, host,
>>>> +			    &mmc_err_state);
>>>>   	debugfs_create_file("err_stats", 0600, root, host,
>>>>   			    &mmc_err_stats_fops);
>>>>