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From 8d7fd13f802585147ea04537d32c12bd2ba828e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Tue, 21 Aug 2018 11:11:36 +0200
Subject: [PATCH 5206/5725] drm/amdgpu: add ring soft recovery v4
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Instead of hammering hard on the GPU try a soft recovery first.
v2: reorder code a bit
v3: increase timeout to 10ms, increment GPU reset counter
v4: squash in compile fix (Christian)
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_job.c | 6 ++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 25 +++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h | 4 ++++
3 files changed, 35 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
index f72d959..2d50825 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_job.c
@@ -33,6 +33,12 @@ static void amdgpu_job_timedout(struct drm_sched_job *s_job)
struct amdgpu_ring *ring = to_amdgpu_ring(s_job->sched);
struct amdgpu_job *job = to_amdgpu_job(s_job);
+ if (amdgpu_ring_soft_recovery(ring, job->vmid, s_job->s_fence->parent)) {
+ DRM_ERROR("ring %s timeout, but soft recovered\n",
+ s_job->sched->name);
+ return;
+ }
+
DRM_ERROR("ring %s timeout, signaled seq=%u, emitted seq=%u\n",
job->base.sched->name, atomic_read(&ring->fence_drv.last_seq),
ring->fence_drv.sync_seq);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 93794a8..5a56d9a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -481,6 +481,31 @@ void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,
amdgpu_ring_emit_reg_wait(ring, reg1, mask, mask);
}
+/**
+ * amdgpu_ring_soft_recovery - try to soft recover a ring lockup
+ *
+ * @ring: ring to try the recovery on
+ * @vmid: VMID we try to get going again
+ * @fence: timedout fence
+ *
+ * Tries to get a ring proceeding again when it is stuck.
+ */
+bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
+ struct dma_fence *fence)
+{
+ ktime_t deadline = ktime_add_us(ktime_get(), 10000);
+
+ if (!ring->funcs->soft_recovery)
+ return false;
+
+ atomic_inc(&ring->adev->gpu_reset_counter);
+ while (!dma_fence_is_signaled(fence) &&
+ ktime_to_ns(ktime_sub(deadline, ktime_get())) > 0)
+ ring->funcs->soft_recovery(ring, vmid);
+
+ return dma_fence_is_signaled(fence);
+}
+
/*
* Debugfs info
*/
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 1f5fcfd..6ea3827 100755
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -168,6 +168,8 @@ struct amdgpu_ring_funcs {
/* priority functions */
void (*set_priority) (struct amdgpu_ring *ring,
enum drm_sched_priority priority);
+ /* Try to soft recover the ring to make the fence signal */
+ void (*soft_recovery)(struct amdgpu_ring *ring, unsigned vmid);
};
struct amdgpu_ring {
@@ -265,6 +267,8 @@ void amdgpu_ring_lru_touch(struct amdgpu_device *adev, struct amdgpu_ring *ring)
void amdgpu_ring_emit_reg_write_reg_wait_helper(struct amdgpu_ring *ring,
uint32_t reg0, uint32_t val0,
uint32_t reg1, uint32_t val1);
+bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
+ struct dma_fence *fence);
static inline void amdgpu_ring_clear_ring(struct amdgpu_ring *ring)
{
--
2.7.4
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