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SubjectRe: [PATCH V4 2/7] mmc: sdhci: Capture eMMC and SD card errors
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On 2.3.2022 15.03, 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>
> ---
> drivers/mmc/host/sdhci.c | 52 +++++++++++++++++++++++++++++++++++++-----------
> 1 file changed, 40 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 07c6da1..741fb06 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -3159,6 +3159,7 @@ 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);

Let's make a macro for this:

#define sdhci_err_stats_inc(host, err_name) \
mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_ ## err_name)

> pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
> mmc_hostname(host->mmc));

Please move the err_stats_inc here after the error message i.e.

sdhci_err_stats_inc(host, REQ_TIMEOUT);

> sdhci_dumpregs(host);
> @@ -3181,6 +3182,7 @@ 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));

Please move the err_stats_inc here after the error message i.e.

sdhci_err_stats_inc(host, REQ_TIMEOUT);

> sdhci_dumpregs(host);
> @@ -3240,11 +3242,15 @@ 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)

That should be && not ||

Please add a helper as below, then this can be:

if (!mmc_op_tuning(host->cmd->opcode))
sdhci_err_stats_inc(host, CMD_CRC);


diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index d9a65c6a8816..d809bdfcc59b 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:
*


> + 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)) ==
> @@ -3265,6 +3271,7 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
> int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
> -ETIMEDOUT :
> -EILSEQ;

Should be a blank line here after the local variable declarations.

> + mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_AUTO_CMD);
>
> if (sdhci_auto_cmd23(host, mrq)) {
> mrq->sbc->error = err;
> @@ -3342,6 +3349,7 @@ 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 +3383,25 @@ 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);
> + }

The parenthesis should be with the 'else'. Please use checkpatch with the --strict option
and fix the issues.

> 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);

As previously:

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);
> + 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 +3920,33 @@ 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)

Please count INDEX and END_BIT errors same as CRC errors i.e. just

if (!mmc_op_tuning(host->cmd->opcode))
sdhci_err_stats_inc(host, CMD_CRC);
> + 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)

Please count END_BIT error same as CRC error i.e. just

if (!mmc_op_tuning(host->cmd->opcode))
sdhci_err_stats_inc(host, DAT_CRC);
> + 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. */

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