mmc: debugfs: Add debug fs entry for mmc driver

Add debug fs entry to query eMMC and SD card errors statistics

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>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1653674036-21829-4-git-send-email-quic_c_sbhanu@quicinc.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 3fdbc801e64a63ca098ace1a70c9b9f4458603c1..6aa5a60b6e8133299017b7e3a3a04e4f09b9e715 100644 (file)
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -223,6 +223,59 @@ 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_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",
+               [MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors",
+               [MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors",
+       };
+       int i;
+
+       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;
+
+       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 +289,9 @@ 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_stats", 0600, root, host,
+                           &mmc_err_stats_fops);
+
 #ifdef CONFIG_FAIL_MMC_REQUEST
        if (fail_request)
                setup_fault_attr(&fail_default_attr, fail_request);