RE: [PATCH V2] mmc: debugfs: add error statistics

From: Sajida Bhanu (Temp) (QUIC)
Date: Mon Jan 10 2022 - 08:12:40 EST

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Hi Adrian,

Thanks for the review.

Please find the inline comments

Thanks,
Sajida

-----Original Message-----
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Sent: Friday, January 7, 2022 1:13 PM
To: Sajida Bhanu (Temp) (QUIC) <quic_c_sbhanu@xxxxxxxxxxx>; riteshh@xxxxxxxxxxxxxx; Asutosh Das (asd) <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
Subject: Re: [PATCH V2] mmc: debugfs: add error statistics

On 04/01/2022 17:02, Sajida Bhanu (Temp) (QUIC) wrote:
> Hi Adrian,
>
> Thanks for the review.
>
> Please find the inline comments.
>
> Thanks,
> Sajida
>
> -----Original Message-----
> From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Sent: Monday, January 3, 2022 3:20 PM
> To: Sajida Bhanu (Temp) (QUIC) <quic_c_sbhanu@xxxxxxxxxxx>;
> riteshh@xxxxxxxxxxxxxx; Asutosh Das (asd) <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
> Subject: Re: [PATCH V2] mmc: debugfs: add error statistics
>
> On 21/12/2021 09:16, Sajida Bhanu (Temp) (QUIC) wrote:
>> Hi Adrian,
>>
>> Thanks for the review.
>>
>> Please find the inline comments.
>
> I find the way the inline comments are done a bit difficult to follow, since what I wrote is not quoted, and what you wrote is quoted. Normally it is the other way around.
>
>>
>> Thanks,
>> Sajida
>>
>> -----Original Message-----
>> From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
>> Sent: Wednesday, December 15, 2021 7:33 PM
>> To: Sajida Bhanu (Temp) (QUIC) <quic_c_sbhanu@xxxxxxxxxxx>;
>> riteshh@xxxxxxxxxxxxxx; Asutosh Das (asd) <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
>> Subject: Re: [PATCH V2] mmc: debugfs: add error statistics
>>
>> On 14/12/2021 16:41, Shaik Sajida Bhanu wrote:
>>> 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.
>>
>> Thanks for doing this.
>>
>>> ---
>>> 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;
>>
>> Is there much reason to disable err stats from userspace?
>>
>>>>>>> Yes , while debugging we can go and check err_state , It is false means no errors happened in driver level and true means errors happened in driver level and then we can go and check err_stats[] to know more on error details like data CRC , command CRC etc.
>
> That is not exectly how it is programmed. "err_state is false" means no errors have been recorded, not that no errors happended.
>
>>>>>>> If user wants to explicitly clear then he can use this.

Seems over compilicated. A user can just diff the old and new values:

cat /sys/kernel/debug/mmc0/err_stats > /tmp/old-stats ...later...
cat /sys/kernel/debug/mmc0/err_stats > /tmp/new-stats diff /tmp/old-stats /tmp/new-stats mv /tmp/new-stats /tmp/old-stats

I suggest just outputting the stats

>>>>>>> Thanks for the suggestion Adrain.
This way user has to call write to store the err_stats data to /tmp/old-stats and user has to call read to read /tmp/old-stats.

And our idea is user call only read to get error stats info.

Please suggest me which is okay.

Thanks,
Sajida

>
>>
>>> +
>>> + 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;
>>
>> I was thinking we needed a way to determine whether stats were being collected because not all drivers would support it at least initially e.g.
>>
>> if (!host->err_stats_enabled) {
>> seq_printf(file, "Not supported by driver\n");
>> return 0;
>> }
>>
>>>>>>>>> You mean declare another variable (err_stats_enabled) and enable it in probe?
>
> Yes, although it is not clear if this is the same as what you want from err_state, i.e. is err_state different from err_stats_enabled?
>
>>>>>> Yes, err_state and err_stats_enabled both are different. err_state will be set if any errors happened in driver level.
> err_stats_enabled will be set if err_stats feature enabled, if any vendor wants to use err_stats feature they will set this err_stats_enabled in their vendor specific file.
>
>>
>>> +
>>> + seq_printf(file, "# Command Timeout Occurred:\t %d\n",
>>> + host->err_stats[MMC_ERR_CMD_TIMEOUT]);
>>
>> Maybe put the descriptions in an array and iterate e.g.
>>
>> const char *desc[MMC_ERR_MAX] = {
>> [MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",
>> etc
>> };
>> int i;
>>
>> if (!host)
>> return -EINVAL;
>>
>> for (i = 0; i < MMC_ERR_MAX; i++) {
>> if (desc[i])
>> seq_printf(file, "# %s:\t %d\n",
>> desc[1], host->err_stats[i]);
>> }
>>
>>>>>>>>> Sure
>>
>>> +
>>> + 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
>>
>> I think the core changes should be a separate patch from sdhci.
>> I would probably split into 4:
>> mmc core
>> mmc block driver
>> cqhci driver
>> sdhci driver
>>
>>>>>> Sure
>>
>>> 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);
>>
>> Why here and not in e.g. __sdhci_add_host() ?
>>
>>>>>> If any errors happened in driver level then we will call sdhci_dumpregs() right( err_state true means some errors happened in driver level ). So it is better to call mmc_debugfs_err_stats_enable() here.
>
> Registers are not dumped for most errors. Please move this to __sdhci_add_host().
>
>>>>> err_state is true means errors happened in driver level and for most of the errors we are dumping the registers, so I am thinking it is better to have this call in sdhci_dumpregs() only.
>
>>
>>> 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];
>>
>> If you make it u64 then we don't have to think about the value overflowing.
>>
>>>>> Sure
>>
>>> + 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;
>>
>> This would be better handled in the card init code somewhere, not 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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