linux-kernel - [PATCH v6 6/7] coresight: tmc: Stop trace capture on FlIn

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Date: Fri, 5 Jan 2024 11:28:39 +0530
From: Linu Cherian <lcherian@...vell.com>
To: <suzuki.poulose@....com>, <mike.leach@...aro.org>, <james.clark@....com>,
        <leo.yan@...aro.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <coresight@...ts.linaro.org>,
        <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <sgoutham@...vell.com>,
        <gcherian@...vell.com>, Linu Cherian <lcherian@...vell.com>
Subject: [PATCH v6 6/7] coresight: tmc: Stop trace capture on FlIn

Configure TMC ETR and ETF to flush and stop trace capture
on FlIn event. As a side effect, do manual flush only if
auto flush fails.

Signed-off-by: Linu Cherian <lcherian@...vell.com>
---
Changelog from v5:
* No changes

 drivers/hwtracing/coresight/coresight-tmc-etf.c | 10 ++++++++--
 drivers/hwtracing/coresight/coresight-tmc-etr.c | 10 ++++++++--
 drivers/hwtracing/coresight/coresight-tmc.h     |  3 +++
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 72c2315f4e23..57a9a9300d36 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -34,7 +34,7 @@ static int __tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
 	writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
 	writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
 		       TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
-		       TMC_FFCR_TRIGON_TRIGIN,
+		       TMC_FFCR_TRIGON_TRIGIN | TMC_FFCR_STOP_ON_FLUSH,
 		       drvdata->base + TMC_FFCR);
 
 	writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
@@ -615,7 +615,13 @@ static int tmc_panic_sync_etf(struct coresight_device *csdev)
 	if (val != TMC_MODE_CIRCULAR_BUFFER)
 		goto out;
 
-	tmc_flush_and_stop(drvdata);
+	val = readl(drvdata->base + TMC_FFSR);
+	/* Do manual flush and stop only if its not auto-stopped */
+	if (!(val & TMC_FFSR_FT_STOPPED)) {
+		dev_info(&csdev->dev,
+			 "%s: Triggering manual flush\n", __func__);
+		tmc_flush_and_stop(drvdata);
+	}
 
 	/* Sync registers from hardware to metadata region */
 	mdata->sts = csdev_access_relaxed_read32(csa, TMC_STS);
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index ab7521bbb2f5..4b3c7ec7f62b 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1113,7 +1113,7 @@ static int __tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
 
 	writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
 		       TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
-		       TMC_FFCR_TRIGON_TRIGIN,
+		       TMC_FFCR_TRIGON_TRIGIN | TMC_FFCR_STOP_ON_FLUSH,
 		       drvdata->base + TMC_FFCR);
 	writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
 	tmc_enable_hw(drvdata);
@@ -1846,7 +1846,13 @@ static int tmc_panic_sync_etr(struct coresight_device *csdev)
 	if (!(val & TMC_CTL_CAPT_EN))
 		goto out;
 
-	tmc_flush_and_stop(drvdata);
+	val = readl(drvdata->base + TMC_FFSR);
+	/* Do manual flush and stop only if its not auto-stopped */
+	if (!(val & TMC_FFSR_FT_STOPPED)) {
+		dev_info(&csdev->dev,
+			 "%s: Triggering manual flush\n", __func__);
+		tmc_flush_and_stop(drvdata);
+	}
 
 	/* Sync registers from hardware to metadata region */
 	mdata->size = csdev_access_relaxed_read32(csa, TMC_RSZ);
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 6e1e910d5ea4..cf9313b302c7 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -77,6 +77,9 @@
 #define TMC_AXICTL_AXCACHE_OS	(0xf << 2)
 #define TMC_AXICTL_ARCACHE_OS	(0xf << 16)
 
+/* TMC_FFSR - 0x300 */
+#define TMC_FFSR_FT_STOPPED	BIT(1)
+
 /* TMC_FFCR - 0x304 */
 #define TMC_FFCR_FLUSHMAN_BIT	6
 #define TMC_FFCR_EN_FMT		BIT(0)
-- 
2.34.1