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From: Rob Herring <robh@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	David Airlie <airlied@linux.ie>,
	dri-devel@lists.freedesktop.org,
	Steven Price <steven.price@arm.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Robin Murphy <robin.murphy@arm.com>
Subject: [PATCH v2] drm/panfrost: Don't try to map on error faults
Date: Wed, 12 Feb 2020 14:22:36 -0600	[thread overview]
Message-ID: <20200212202236.13095-1-robh@kernel.org> (raw)

From: Tomeu Vizoso <tomeu.vizoso@collabora.com>

If the exception type isn't a translation fault, don't try to map and
instead go straight to a terminal fault.

Otherwise, we can get flooded by kernel warnings and further faults.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
I rewrote this some simplifying the code and somewhat following Steven's 
suggested. Still not using defines though. No defines here was good 
enough before IMO.

Only compile tested.

 drivers/gpu/drm/panfrost/panfrost_mmu.c | 44 +++++++++++--------------
 1 file changed, 19 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index 763cfca886a7..4f2836bd9215 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -596,33 +596,27 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
 		source_id = (fault_status >> 16);
 
 		/* Page fault only */
-		if ((status & mask) == BIT(i)) {
-			WARN_ON(exception_type < 0xC1 || exception_type > 0xC4);
-
+		ret = -1;
+		if ((status & mask) == BIT(i) && (exception_type & 0xF8) == 0xC0)
 			ret = panfrost_mmu_map_fault_addr(pfdev, i, addr);
-			if (!ret) {
-				mmu_write(pfdev, MMU_INT_CLEAR, BIT(i));
-				status &= ~mask;
-				continue;
-			}
-		}
 
-		/* terminal fault, print info about the fault */
-		dev_err(pfdev->dev,
-			"Unhandled Page fault in AS%d at VA 0x%016llX\n"
-			"Reason: %s\n"
-			"raw fault status: 0x%X\n"
-			"decoded fault status: %s\n"
-			"exception type 0x%X: %s\n"
-			"access type 0x%X: %s\n"
-			"source id 0x%X\n",
-			i, addr,
-			"TODO",
-			fault_status,
-			(fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
-			exception_type, panfrost_exception_name(pfdev, exception_type),
-			access_type, access_type_name(pfdev, fault_status),
-			source_id);
+		if (ret)
+			/* terminal fault, print info about the fault */
+			dev_err(pfdev->dev,
+				"Unhandled Page fault in AS%d at VA 0x%016llX\n"
+				"Reason: %s\n"
+				"raw fault status: 0x%X\n"
+				"decoded fault status: %s\n"
+				"exception type 0x%X: %s\n"
+				"access type 0x%X: %s\n"
+				"source id 0x%X\n",
+				i, addr,
+				"TODO",
+				fault_status,
+				(fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
+				exception_type, panfrost_exception_name(pfdev, exception_type),
+				access_type, access_type_name(pfdev, fault_status),
+				source_id);
 
 		mmu_write(pfdev, MMU_INT_CLEAR, mask);
 
-- 
2.20.1

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WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	David Airlie <airlied@linux.ie>,
	dri-devel@lists.freedesktop.org,
	Steven Price <steven.price@arm.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Robin Murphy <robin.murphy@arm.com>
Subject: [PATCH v2] drm/panfrost: Don't try to map on error faults
Date: Wed, 12 Feb 2020 14:22:36 -0600	[thread overview]
Message-ID: <20200212202236.13095-1-robh@kernel.org> (raw)

From: Tomeu Vizoso <tomeu.vizoso@collabora.com>

If the exception type isn't a translation fault, don't try to map and
instead go straight to a terminal fault.

Otherwise, we can get flooded by kernel warnings and further faults.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
I rewrote this some simplifying the code and somewhat following Steven's 
suggested. Still not using defines though. No defines here was good 
enough before IMO.

Only compile tested.

 drivers/gpu/drm/panfrost/panfrost_mmu.c | 44 +++++++++++--------------
 1 file changed, 19 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index 763cfca886a7..4f2836bd9215 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -596,33 +596,27 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
 		source_id = (fault_status >> 16);
 
 		/* Page fault only */
-		if ((status & mask) == BIT(i)) {
-			WARN_ON(exception_type < 0xC1 || exception_type > 0xC4);
-
+		ret = -1;
+		if ((status & mask) == BIT(i) && (exception_type & 0xF8) == 0xC0)
 			ret = panfrost_mmu_map_fault_addr(pfdev, i, addr);
-			if (!ret) {
-				mmu_write(pfdev, MMU_INT_CLEAR, BIT(i));
-				status &= ~mask;
-				continue;
-			}
-		}
 
-		/* terminal fault, print info about the fault */
-		dev_err(pfdev->dev,
-			"Unhandled Page fault in AS%d at VA 0x%016llX\n"
-			"Reason: %s\n"
-			"raw fault status: 0x%X\n"
-			"decoded fault status: %s\n"
-			"exception type 0x%X: %s\n"
-			"access type 0x%X: %s\n"
-			"source id 0x%X\n",
-			i, addr,
-			"TODO",
-			fault_status,
-			(fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
-			exception_type, panfrost_exception_name(pfdev, exception_type),
-			access_type, access_type_name(pfdev, fault_status),
-			source_id);
+		if (ret)
+			/* terminal fault, print info about the fault */
+			dev_err(pfdev->dev,
+				"Unhandled Page fault in AS%d at VA 0x%016llX\n"
+				"Reason: %s\n"
+				"raw fault status: 0x%X\n"
+				"decoded fault status: %s\n"
+				"exception type 0x%X: %s\n"
+				"access type 0x%X: %s\n"
+				"source id 0x%X\n",
+				i, addr,
+				"TODO",
+				fault_status,
+				(fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
+				exception_type, panfrost_exception_name(pfdev, exception_type),
+				access_type, access_type_name(pfdev, fault_status),
+				source_id);
 
 		mmu_write(pfdev, MMU_INT_CLEAR, mask);
 
-- 
2.20.1


             reply	other threads:[~2020-02-12 20:22 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12 20:22 Rob Herring [this message]
2020-02-12 20:22 ` [PATCH v2] drm/panfrost: Don't try to map on error faults Rob Herring
2020-02-13 11:13 ` Steven Price
2020-02-13 11:13   ` Steven Price
2020-02-24  7:22 ` Tomeu Vizoso
2020-02-24  7:22   ` Tomeu Vizoso
2020-02-24 12:27 ` Alyssa Rosenzweig
2020-02-24 12:27   ` Alyssa Rosenzweig

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