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?
> 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.
>
> 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);
>
