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From:   Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
To:     adrian.hunter@intel.com, quic_asutoshd@quicinc.com,
        ulf.hansson@linaro.org, agross@kernel.org,
        bjorn.andersson@linaro.org, linux-mmc@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     stummala@codeaurora.org, vbadigan@codeaurora.org,
        quic_rampraka@quicinc.com, quic_pragalla@quicinc.com,
        sartgarg@codeaurora.org, nitirawa@codeaurora.org,
        sayalil@codeaurora.org,
        Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>,
        Liangliang Lu <luliang@codeaurora.org>,
        "Bao D . Nguyen" <nguyenb@codeaurora.org>
Subject: [PATCH V3 1/4] mmc: sdhci: Capture eMMC and SD card errors
Date:   Thu, 20 Jan 2022 22:56:19 +0530
Message-Id: <1642699582-14785-2-git-send-email-quic_c_sbhanu@quicinc.com>
In-Reply-To: <1642699582-14785-1-git-send-email-quic_c_sbhanu@quicinc.com>
References: <1642699582-14785-1-git-send-email-quic_c_sbhanu@quicinc.com>
Precedence: bulk

Add changes to capture eMMC and SD card errors.
This is useful for debug and testing.

Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>
Signed-off-by: Liangliang Lu <luliang@codeaurora.org>
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
---
 drivers/mmc/host/sdhci-msm.c |  3 ++
 drivers/mmc/host/sdhci.c     | 72 ++++++++++++++++++++++++++++++++++++--------
 include/linux/mmc/host.h     | 31 +++++++++++++++++++
 3 files changed, 94 insertions(+), 12 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 50c71e0..309eb7b 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -128,6 +128,8 @@
 
 #define MSM_MMC_AUTOSUSPEND_DELAY_MS	50
 
+#define MSM_MMC_ERR_STATS_ENABLE 1
+
 /* Timeout value to avoid infinite waiting for pwr_irq */
 #define MSM_PWR_IRQ_TIMEOUT_MS 5000
 
@@ -2734,6 +2736,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
 	if (ret)
 		goto pm_runtime_disable;
 
+	host->mmc->err_stats_enabled = MSM_MMC_ERR_STATS_ENABLE;
 	pm_runtime_mark_last_busy(&pdev->dev);
 	pm_runtime_put_autosuspend(&pdev->dev);
 
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 07c6da1..74b356e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -113,6 +113,8 @@ void sdhci_dumpregs(struct sdhci_host *host)
 	if (host->ops->dump_vendor_regs)
 		host->ops->dump_vendor_regs(host);
 
+	if (host->mmc->err_stats_enabled)
+		mmc_debugfs_err_stats_enable(host->mmc);
 	SDHCI_DUMP("============================================\n");
 }
 EXPORT_SYMBOL_GPL(sdhci_dumpregs);
@@ -3159,6 +3161,8 @@ static void sdhci_timeout_timer(struct timer_list *t)
 	spin_lock_irqsave(&host->lock, flags);
 
 	if (host->cmd && !sdhci_data_line_cmd(host->cmd)) {
+		if (host->mmc && host->mmc->err_stats_enabled)
+			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 +3185,8 @@ static void sdhci_timeout_data_timer(struct timer_list *t)
 
 	if (host->data || host->data_cmd ||
 	    (host->cmd && sdhci_data_line_cmd(host->cmd))) {
+		if (host->mmc && host->mmc->err_stats_enabled)
+			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 +3246,18 @@ 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
+			if (host->mmc && host->mmc->err_stats_enabled)
+				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) {
+				if (host->mmc && host->mmc->err_stats_enabled)
+					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)) ==
@@ -3265,6 +3278,8 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask, u32 *intmask_p)
 		int err = (auto_cmd_status & SDHCI_AUTO_CMD_TIMEOUT) ?
 			  -ETIMEDOUT :
 			  -EILSEQ;
+		if (host->mmc && host->mmc->err_stats_enabled)
+			mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_AUTO_CMD);
 
 		if (sdhci_auto_cmd23(host, mrq)) {
 			mrq->sbc->error = err;
@@ -3342,6 +3357,8 @@ 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;
+				if (host->mmc && host->mmc->err_stats_enabled)
+					mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_CMD_TIMEOUT);
 				__sdhci_finish_mrq(host, data_cmd->mrq);
 				return;
 			}
@@ -3375,18 +3392,29 @@ 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;
+		if (host->mmc && host->mmc->err_stats_enabled)
+			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) {
+			if (host->mmc && host->mmc->err_stats_enabled)
+				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);
+		if (host->mmc && host->mmc->err_stats_enabled)
+			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 +3933,40 @@ 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) {
+				if (host->mmc && host->mmc->err_stats_enabled)
+					mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_CMD_CRC);
+			}
+		}
+	} else if (intmask & SDHCI_INT_TIMEOUT) {
 		*cmd_error = -ETIMEDOUT;
-	else
+		if (host->mmc && host->mmc->err_stats_enabled)
+			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) {
+				if (host->mmc && host->mmc->err_stats_enabled)
+					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)
+		if (host->mmc && host->mmc->err_stats_enabled)
+			mmc_debugfs_err_stats_inc(host->mmc, MMC_ERR_DAT_TIMEOUT);
+	} else if (intmask & SDHCI_INT_ADMA_ERROR) {
 		*data_error = -EIO;
-	else
+		if (host->mmc && host->mmc->err_stats_enabled)
+			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..883b50b 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 +517,9 @@ struct mmc_host {
 
 	/* Host Software Queue support */
 	bool			hsq_enabled;
+	u32                     err_stats[MMC_ERR_MAX];
+	bool 			err_stats_enabled;
+	bool			err_state;
 
 	unsigned long		private[] ____cacheline_aligned;
 };
@@ -635,6 +655,17 @@ 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) {
+
+	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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