RE: [PATCH V3 1/4] mmc: sdhci: Capture eMMC and SD card errors

From: Sajida Bhanu (Temp) (QUIC)
Date: Tue Feb 08 2022 - 14:06:08 EST

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Hi,

Thanks for the review.

Please find the inline comments

Thanks,
Sajida
-----Original Message-----
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Sent: Tuesday, February 1, 2022 7:28 PM
To: Sajida Bhanu (Temp) <c_sbhanu@xxxxxxxxxxxxxxxx>; Sajida Bhanu (Temp) (QUIC) <quic_c_sbhanu@xxxxxxxxxxx>; Asutosh Das (QUIC) <quic_asutoshd@xxxxxxxxxxx>; ulf.hansson@xxxxxxxxxx; agross@xxxxxxxxxx; bjorn.andersson@xxxxxxxxxx; linux-mmc@xxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
Cc: stummala@xxxxxxxxxxxxxx; vbadigan@xxxxxxxxxxxxxx; Ram Prakash Gupta (QUIC) <quic_rampraka@xxxxxxxxxxx>; Pradeep Pragallapati (QUIC) <quic_pragalla@xxxxxxxxxxx>; sartgarg@xxxxxxxxxxxxxx; nitirawa@xxxxxxxxxxxxxx; sayalil@xxxxxxxxxxxxxx; Liangliang Lu <luliang@xxxxxxxxxxxxxx>; Bao D . Nguyen <nguyenb@xxxxxxxxxxxxxx>
Subject: Re: [PATCH V3 1/4] mmc: sdhci: Capture eMMC and SD card errors

On 25/01/2022 20:17, Sajida Bhanu (Temp) wrote:
> Hi,
>
> Thanks for the Review.
>
> Please find the inline comments.
>
> Thanks,
> Sajida
>
> -----Original Message-----
> From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Sent: Friday, January 21, 2022 12:38 PM
> To: Sajida Bhanu (Temp) (QUIC) <quic_c_sbhanu@xxxxxxxxxxx>; Asutosh
> Das (QUIC) <quic_asutoshd@xxxxxxxxxxx>; ulf.hansson@xxxxxxxxxx;
> agross@xxxxxxxxxx; bjorn.andersson@xxxxxxxxxx;
> linux-mmc@xxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx
> Cc: stummala@xxxxxxxxxxxxxx; vbadigan@xxxxxxxxxxxxxx; Ram Prakash
> Gupta (QUIC) <quic_rampraka@xxxxxxxxxxx>; Pradeep Pragallapati (QUIC)
> <quic_pragalla@xxxxxxxxxxx>; sartgarg@xxxxxxxxxxxxxx;
> nitirawa@xxxxxxxxxxxxxx; sayalil@xxxxxxxxxxxxxx; Liangliang Lu
> <luliang@xxxxxxxxxxxxxx>; Bao D . Nguyen <nguyenb@xxxxxxxxxxxxxx>
> Subject: Re: [PATCH V3 1/4] mmc: sdhci: Capture eMMC and SD card
> errors
>
> On 20/01/2022 19:26, Shaik Sajida Bhanu wrote:
>> Add changes to capture eMMC and SD card errors.
>> This is useful for debug and testing.
>>
>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@xxxxxxxxxxx>
>> Signed-off-by: Liangliang Lu <luliang@xxxxxxxxxxxxxx>
>> Signed-off-by: Sayali Lokhande <sayalil@xxxxxxxxxxxxxx>
>> Signed-off-by: Bao D. Nguyen <nguyenb@xxxxxxxxxxxxxx>
>> ---
>> drivers/mmc/host/sdhci-msm.c | 3 ++
>> drivers/mmc/host/sdhci.c | 72 ++++++++++++++++++++++++++++++++++++--------
>> include/linux/mmc/host.h | 31 +++++++++++++++++++
>> 3 files changed, 94 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-msm.c
>> b/drivers/mmc/host/sdhci-msm.c index 50c71e0..309eb7b 100644
>> --- a/drivers/mmc/host/sdhci-msm.c
>> +++ b/drivers/mmc/host/sdhci-msm.c
>> @@ -128,6 +128,8 @@
>>
>> #define MSM_MMC_AUTOSUSPEND_DELAY_MS 50
>>
>> +#define MSM_MMC_ERR_STATS_ENABLE 1
>> +
>> /* Timeout value to avoid infinite waiting for pwr_irq */ #define
>> MSM_PWR_IRQ_TIMEOUT_MS 5000
>>
>> @@ -2734,6 +2736,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>> if (ret)
>> goto pm_runtime_disable;
>>
>> + host->mmc->err_stats_enabled = MSM_MMC_ERR_STATS_ENABLE;
>
> Please remove this. SDHCI will enable error stats.
>
>>>>>>> Sure.
>
>> pm_runtime_mark_last_busy(&pdev->dev);
>> pm_runtime_put_autosuspend(&pdev->dev);
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index 07c6da1..74b356e 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -113,6 +113,8 @@ void sdhci_dumpregs(struct sdhci_host *host)
>> if (host->ops->dump_vendor_regs)
>> host->ops->dump_vendor_regs(host);
>>
>> + if (host->mmc->err_stats_enabled)
>> + mmc_debugfs_err_stats_enable(host->mmc);
>
> Please move this to sdhci_setup_host() and call it unconditionally
> i.e. just
>
> mmc_debugfs_err_stats_enable(host->mmc);
>
>
>>>>>>>> mmc_debugfs_err_stats_enable() will set err_state , that means some errors occurred in driver level.
> If we move this call to sdhci_setup_host(), then it will set if no errors also right?

Then it seems like you want to set err_state = true in mmc_debugfs_err_stats_inc()

>>>>>No ..I have updated err_state = true in sdhci_dumpregs() because if any errors (serious) in driver, we are calling sdhci_dumpregs().

>
>
>> SDHCI_DUMP("============================================\n");
>> }
>> EXPORT_SYMBOL_GPL(sdhci_dumpregs);
>> @@ -3159,6 +3161,8 @@ static void sdhci_timeout_timer(struct timer_list *t)
>> spin_lock_irqsave(&host->lock, flags);
>>
>> if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_REQ_TIMEOUT);
>
> Please remove the 'if ()', i.e. just make it, unconditionally:
>
> mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_REQ_TIMEOUT);
>
> Same for other calls to mmc_debugfs_err_stats_inc()
>
>>>>>>>>> Sure.
>
>> pr_err("%s: Timeout waiting for hardware cmd interrupt.\n",
>> mmc_hostname(host->mmc));
>> sdhci_dumpregs(host);
>> @@ -3181,6 +3185,8 @@ static void sdhci_timeout_data_timer(struct
>> timer_list *t)
>>
>> if (host->data || host->data_cmd ||
>> (host->cmd && sdhci_data_line_cmd(host->cmd))) {
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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 +3246,18 @@ 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
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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) {
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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
>> +3278,8 @@ 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;
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_AUTO_CMD);
>>
>> if (sdhci_auto_cmd23(host, mrq)) {
>> mrq->sbc->error = err;
>> @@ -3342,6 +3357,8 @@ 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;
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_CMD_TIMEOUT);
>> __sdhci_finish_mrq(host, data_cmd->mrq);
>> return;
>> }
>> @@ -3375,18 +3392,29 @@ 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;
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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) {
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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);
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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 +3933,40
>> @@ 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) {
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_CMD_CRC);
>> + }
>> + }
>> + } else if (intmask & SDHCI_INT_TIMEOUT) {
>> *cmd_error = -ETIMEDOUT;
>> - else
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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) {
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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)
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_DAT_TIMEOUT);
>> + } else if (intmask & SDHCI_INT_ADMA_ERROR) {
>> *data_error = -EIO;
>> - else
>> + if (host->mmc && host->mmc->err_stats_enabled)
>> + 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
>
> Changes to host.h are core changes and belong in patch 3, which should be the first patch.
>
>>>>>> Sure.
>
>> index 7afb57c..883b50b 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 +517,9 @@ struct mmc_host {
>>
>> /* Host Software Queue support */
>> bool hsq_enabled;
>> + u32 err_stats[MMC_ERR_MAX];
>> + bool err_stats_enabled;
>> + bool err_state;
>
> Please drop err_state for now
>
>>>>>>>> first we can check this variable right, if it is set then we can go and check err_stats[] to know more on type of error (data /cmd timeout or CRC errors etc.).
> Please let me know your opinion on this.

As I wrote above, you could set err_state in mmc_debugfs_err_stats_inc().
But maybe make the err_state addition a separate patch so it is easy to see how it works.

>>>>> Sure will post separate patch for err_state settings.

>
>>
>> unsigned long private[] ____cacheline_aligned;
>> };
>> @@ -635,6 +655,17 @@ 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)
>
> Please use 'host' as the mmc_host parameter in this file.
>
>> +{
>> + mmc->err_state = true;
>
> Let's make this:
>
> host->err_stats_enabled = true;
>
>>>>>>> Sure.
>
>> +}
>> +
>> +static inline void mmc_debugfs_err_stats_inc(struct mmc_host *mmc,
>> + enum mmc_err_stat stat) {
>> +
>
> Please remove blank line here
>
>>>>>>> sure.
>
>> + 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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Next in thread: Adrian Hunter: "Re: [PATCH V3 1/4] mmc: sdhci: Capture eMMC and SD card errors"
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