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Date: Tue, 25 Jan 2022 18:19:50 +0000
From: "Sajida Bhanu (Temp) (QUIC)" <quic_c_sbhanu@...cinc.com>
To: Adrian Hunter <adrian.hunter@...el.com>,
"Sajida Bhanu (Temp) (QUIC)" <quic_c_sbhanu@...cinc.com>,
"Asutosh Das (QUIC)" <quic_asutoshd@...cinc.com>,
"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
"agross@...nel.org" <agross@...nel.org>,
"bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "stummala@...eaurora.org" <stummala@...eaurora.org>,
"vbadigan@...eaurora.org" <vbadigan@...eaurora.org>,
"Ram Prakash Gupta (QUIC)" <quic_rampraka@...cinc.com>,
"Pradeep Pragallapati (QUIC)" <quic_pragalla@...cinc.com>,
"sartgarg@...eaurora.org" <sartgarg@...eaurora.org>,
"nitirawa@...eaurora.org" <nitirawa@...eaurora.org>,
"sayalil@...eaurora.org" <sayalil@...eaurora.org>,
Liangliang Lu <luliang@...eaurora.org>,
"Bao D . Nguyen" <nguyenb@...eaurora.org>
Subject: RE: [PATCH V3 2/4] mmc: debugfs: Add debug fs entry for mmc driver
Hi,
Thanks for the review.
Please find the inline comments.
Thanks,
Sajida
-----Original Message-----
From: Adrian Hunter <adrian.hunter@...el.com>
Sent: Friday, January 21, 2022 12:40 PM
To: Sajida Bhanu (Temp) (QUIC) <quic_c_sbhanu@...cinc.com>; Asutosh Das (QUIC) <quic_asutoshd@...cinc.com>; ulf.hansson@...aro.org; agross@...nel.org; bjorn.andersson@...aro.org; linux-mmc@...r.kernel.org; linux-arm-msm@...r.kernel.org; linux-kernel@...r.kernel.org
Cc: stummala@...eaurora.org; vbadigan@...eaurora.org; Ram Prakash Gupta (QUIC) <quic_rampraka@...cinc.com>; Pradeep Pragallapati (QUIC) <quic_pragalla@...cinc.com>; sartgarg@...eaurora.org; nitirawa@...eaurora.org; sayalil@...eaurora.org; Liangliang Lu <luliang@...eaurora.org>; Bao D . Nguyen <nguyenb@...eaurora.org>
Subject: Re: [PATCH V3 2/4] mmc: debugfs: Add debug fs entry for mmc driver
On 20/01/2022 19:26, Shaik Sajida Bhanu wrote:
> Add debug fs entry to query eMMC and SD card errors statistics
>
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
> Signed-off-by: Liangliang Lu <luliang@...eaurora.org>
> Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
> Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
> ---
> drivers/mmc/core/debugfs.c | 81
> ++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 81 insertions(+)
>
> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
> index 3fdbc80..f4cb594 100644
> --- a/drivers/mmc/core/debugfs.c
> +++ b/drivers/mmc/core/debugfs.c
> @@ -223,6 +223,82 @@ 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;
> +}
> +
> +DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL,
> +"%llu\n");
> +
> +static int mmc_err_stats_show(struct seq_file *file, void *data) {
> + struct mmc_host *host = (struct mmc_host *)file->private;
> + const char *desc[MMC_ERR_MAX] = {
> + [MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",
> + [MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred",
> + [MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred",
> + [MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred",
> + [MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred",
> + [MMC_ERR_ADMA] = "ADMA Error Occurred",
> + [MMC_ERR_TUNING] = "Tuning Error Occurred",
> + [MMC_ERR_CMDQ_RED] = "CMDQ RED Errors",
> + [MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors",
> + [MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors",
> + [MMC_ERR_REQ_TIMEOUT] = "Request Timedout",
> + [MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout",
> + [MMC_ERR_ICE_CFG] = "ICE Config Errors",
> + };
> + int i;
> +
> + if (!host)
> + return -EINVAL;
> +
> + if (!host->err_stats_enabled) {
> + seq_printf(file, "Not supported by driver\n");
> + return 0;
> + }
> +
> + for (i = 0; i < MMC_ERR_MAX; i++) {
> + if (desc[i])
> + seq_printf(file, "# %s:\t %d\n",
> + desc[i], host->err_stats[i]);
> + }
> +
> + 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 +312,11 @@ 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);
Please, let's drop err_state for now
>>>>> first we can check this 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.( Same as patch set (V3 1/4).
> + 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);
>
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