Add debugfs entry to query eMMC and SD card errors statistics.
This feature is useful for debug and testing
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@xxxxxxxxxxx>
---
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.
---
drivers/mmc/core/debugfs.c | 106 +++++++++++++++++++++++++++++++++++++++++++++
drivers/mmc/core/queue.c | 2 +
drivers/mmc/host/sdhci.c | 53 ++++++++++++++++++-----
include/linux/mmc/host.h | 37 ++++++++++++++++
4 files changed, 186 insertions(+), 12 deletions(-)
diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 3fdbc80..40210c34 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -223,6 +223,107 @@ 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_state ? 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_state = 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,
+};
+
void mmc_add_host_debugfs(struct mmc_host *host)
{
struct dentry *root;
@@ -236,6 +337,11 @@ 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);
+
#ifdef CONFIG_FAIL_MMC_REQUEST
if (fail_request)
setup_fault_attr(&fail_default_attr, fail_request);
diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index b15c034..5243929 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -100,6 +100,8 @@ static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req)
enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
bool recovery_needed = false;
+ mmc_debugfs_err_stats_inc(host, MMC_ERR_CMDQ_REQ_TIMEOUT);
+
switch (issue_type) {
case MMC_ISSUE_ASYNC:
case MMC_ISSUE_DCMD:
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 07c6da1..d742051 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -113,6 +113,7 @@ void sdhci_dumpregs(struct sdhci_host *host)
if (host->ops->dump_vendor_regs)
host->ops->dump_vendor_regs(host);
+ mmc_debugfs_err_stats_enable(host->mmc);
SDHCI_DUMP("============================================\n");
}
EXPORT_SYMBOL_GPL(sdhci_dumpregs);
@@ -3159,6 +3160,7 @@ static void sdhci_timeout_timer(struct timer_list *t)
spin_lock_irqsave(&host->lock, flags);
if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_REQ_TIMEOUT);
pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
@@ -3181,6 +3183,7 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
if (host->data || host->data_cmd ||
(host->cmd && sdhci_data_line_cmd(host->cmd))) {
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_REQ_TIMEOUT);
pr_err("%s: Timeout waiting for hardware interrupt.\n",
mmc_hostname(host->mmc));
sdhci_dumpregs(host);
@@ -3240,11 +3243,15 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
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
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_CMD_TIMEOUT);
+ } else {
host->cmd->error = -EILSEQ;
-
+ if (host->cmd->opcode != MMC_SEND_TUNING_BLOCK ||
+ host->cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_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 +3273,7 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
-ETIMEDOUT :
-EILSEQ;
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_AUTO_CMD);
if (sdhci_auto_cmd23(host, mrq)) {
mrq->sbc->error = err;
__sdhci_finish_mrq(host, mrq);
@@ -3342,6 +3350,7 @@ 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;
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_CMD_TIMEOUT);
__sdhci_finish_mrq(host, data_cmd->mrq);
return;
}
@@ -3375,18 +3384,25 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
return;
}
- if (intmask & SDHCI_INT_DATA_TIMEOUT)
+ if (intmask & SDHCI_INT_DATA_TIMEOUT) {
host->data->error = -ETIMEDOUT;
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_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 (host->cmd->opcode != MMC_SEND_TUNING_BLOCK ||
+ host->cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_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);
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_ADMA);
host->data->error = -EIO;
if (host->ops->adma_workaround)
host->ops->adma_workaround(host, intmask);
@@ -3905,20 +3921,33 @@ 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 (intmask & SDHCI_INT_CRC) {
+ if (host->cmd->opcode != MMC_SEND_TUNING_BLOCK ||
+ host->cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_CMD_CRC);
+ }
+ } else if (intmask & SDHCI_INT_TIMEOUT) {
*cmd_error = -ETIMEDOUT;
- else
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_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 (intmask & SDHCI_INT_DATA_CRC) {
+ if (host->cmd->opcode != MMC_SEND_TUNING_BLOCK ||
+ host->cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_DAT_CRC);
+ }
+ } else if (intmask & SDHCI_INT_DATA_TIMEOUT) {
*data_error = -ETIMEDOUT;
- else if (intmask & SDHCI_INT_ADMA_ERROR)
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_DAT_TIMEOUT);
+ } else if (intmask & SDHCI_INT_ADMA_ERROR) {
*data_error = -EIO;
- else
+ mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_ADMA);
+ } else
*data_error = 0;
/* Clear selected interrupts. */
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 7afb57c..c263f8f 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -93,6 +93,23 @@ 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_MAX,
+};
+
struct mmc_host_ops {
/*
* It is optional for the host to implement pre_req and post_req in
@@ -500,6 +517,8 @@ struct mmc_host {
/* Host Software Queue support */
bool hsq_enabled;
+ u32 err_stats[MMC_ERR_MAX];
+ bool err_state;
unsigned long private[] ____cacheline_aligned;
};
@@ -635,6 +654,24 @@ 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_enable(struct mmc_host *mmc)
+{
+ mmc->err_state = true;
+}
+
+static inline void mmc_debugfs_err_stats_inc(struct mmc_host *mmc,
+ enum mmc_err_stat stat) {
+
+ /*
+ * Ignore the command timeout errors observed during
+ * the card init as those are excepted.
+ */
+ if (!mmc->err_state)
+ mmc->err_stats[MMC_ERR_CMD_TIMEOUT] = 0;
+
+ mmc->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);
--
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