linux-kernel - [PATCH V4 4/7] mmc: debugfs: Add debug fs error state entry for mmc driver

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Message-Id: <1646226227-32429-5-git-send-email-quic_c_sbhanu@quicinc.com>
Date:   Wed,  2 Mar 2022 18:33:44 +0530
From:   Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
To:     adrian.hunter@...el.com, quic_riteshh@...cinc.com,
        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:     quic_vbadigan@...cinc.com, 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 V4 4/7] 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 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index db0988c..7d78eac 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -222,6 +222,19 @@ 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)
 {
@@ -293,6 +306,8 @@ 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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