linux-kernel - [PATCH V6 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

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Message-Id: <1652857340-6040-5-git-send-email-quic_c_sbhanu@quicinc.com>
Date:   Wed, 18 May 2022 12:32:19 +0530
From:   Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        wsa+renesas@...g-engineering.com, shawn.lin@...k-chips.com,
        yoshihiro.shimoda.uh@...esas.com, digetx@...il.com,
        quic_asutoshd@...cinc.com
Cc:     linux-arm-msm@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_rampraka@...cinc.com,
        quic_pragalla@...cinc.com, quic_sartgarg@...cinc.com,
        quic_nitirawa@...cinc.com, quic_sayalil@...cinc.com,
        Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>,
        Liangliang Lu <quic_luliang@...cinc.com>,
        "Bao D . Nguyen" <quic_nguyenb@...cinc.com>
Subject: [PATCH V6 4/5] mmc: debugfs: Add debug fs error state entry for mmc driver

Add debug fs entry error state to query eMMC and SD card errors statistics.
If any errors occurred in eMMC and SD card driver level then
err_state value will be set to 1.

Signed-off-by: Liangliang Lu <quic_luliang@...cinc.com>
Signed-off-by: Sayali Lokhande <quic_sayalil@...cinc.com>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
---
 drivers/mmc/core/debugfs.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 6aa5a60..3c7908d 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -223,6 +223,27 @@ 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;
+	int i;
+
+	if (!host)
+		return -EINVAL;
+
+	*val = 0;
+	for (i = 0; i < MMC_ERR_MAX; i++) {
+		if (host->err_stats[i]) {
+			*val = 1;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_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;
@@ -289,6 +310,8 @@ 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);
 
-- 
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