From aee4aa73a1af3176cc3eea5833cae596b4b7dd22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Tue, 18 Feb 2014 15:24:06 +0100
Subject: [PATCH] drm/radeon: improve ring lockup detection code v2
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Use atomics and jiffies_64, so that we don't need to have the
ring mutex locked any more and avoid wrap arounds.
v2: fix some checkpatch warnings
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/radeon/radeon.h | 4 ++--
drivers/gpu/drm/radeon/radeon_ring.c | 23 ++++++++++-------------
2 files changed, 12 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 4581df193932f..e98fe5c7f77b6 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -805,8 +805,8 @@ struct radeon_ring {
unsigned ring_size;
unsigned ring_free_dw;
int count_dw;
- unsigned long last_activity;
- unsigned last_rptr;
+ atomic_t last_rptr;
+ atomic64_t last_activity;
uint64_t gpu_addr;
uint32_t align_mask;
uint32_t ptr_mask;
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index b14c86d57607f..4c48102723712 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -485,8 +485,8 @@ void radeon_ring_unlock_undo(struct radeon_device *rdev, struct radeon_ring *rin
void radeon_ring_lockup_update(struct radeon_device *rdev,
struct radeon_ring *ring)
{
- ring->last_rptr = radeon_ring_get_rptr(rdev, ring);
- ring->last_activity = jiffies;
+ atomic_set(&ring->last_rptr, radeon_ring_get_rptr(rdev, ring));
+ atomic64_set(&ring->last_activity, jiffies_64);
}
/**
@@ -498,22 +498,19 @@ void radeon_ring_lockup_update(struct radeon_device *rdev,
bool radeon_ring_test_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
{
uint32_t rptr = radeon_ring_get_rptr(rdev, ring);
- unsigned long cjiffies, elapsed;
+ uint64_t last = atomic64_read(&ring->last_activity);
+ uint64_t elapsed;
- cjiffies = jiffies;
- if (!time_after(cjiffies, ring->last_activity)) {
- /* likely a wrap around */
+ if (rptr != atomic_read(&ring->last_rptr)) {
+ /* ring is still working, no lockup */
radeon_ring_lockup_update(rdev, ring);
return false;
}
- if (rptr != ring->last_rptr) {
- /* CP is still working no lockup */
- radeon_ring_lockup_update(rdev, ring);
- return false;
- }
- elapsed = jiffies_to_msecs(cjiffies - ring->last_activity);
+
+ elapsed = jiffies_to_msecs(jiffies_64 - last);
if (radeon_lockup_timeout && elapsed >= radeon_lockup_timeout) {
- dev_err(rdev->dev, "GPU lockup CP stall for more than %lumsec\n", elapsed);
+ dev_err(rdev->dev, "ring %d stalled for more than %llumsec\n",
+ ring->idx, elapsed);
return true;
}
/* give a chance to the GPU ... */