[PATCH 4/4] drm/msm/a5xx: workaround early ring-buffer emptiness check

[Vladimir Lypak]

There is another cause for soft lock-up of GPU in empty ring-buffer:
race between GPU executing last commands and CPU checking ring for
emptiness. On GPU side IRQ for retire is triggered by CACHE_FLUSH_TS
event and RPTR shadow (which is used to check ring emptiness) is updated
a bit later from CP_CONTEXT_SWITCH_YIELD. Thus if GPU is executing its
last commands slow enough or we check that ring too fast we will miss a
chance to trigger switch to lower priority ring because current ring isn't
empty just yet. This can escalate to lock-up situation described in
previous patch.
To work-around this issue we keep track of last submit sequence number
for each ring and compare it with one written to memptrs from GPU during
execution of CACHE_FLUSH_TS event.

Fixes: b1fc2839d2f9 ("drm/msm: Implement preemption for A5XX targets")
Signed-off-by: Vladimir Lypak <vladimir.ly...@gmail.com>
---
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c     | 4 ++++
 drivers/gpu/drm/msm/adreno/a5xx_gpu.h     | 1 +
 drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 4 ++++
 3 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c 
b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 266744ee1d5f..001f11f5febc 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -65,6 +65,8 @@ void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer 
*ring,
 
 static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit 
*submit)
 {
+       struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+       struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu);
        struct msm_ringbuffer *ring = submit->ring;
        struct drm_gem_object *obj;
        uint32_t *ptr, dwords;
@@ -109,6 +111,7 @@ static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct 
msm_gem_submit *submit
                }
        }
 
+       a5xx_gpu->last_seqno[ring->id] = submit->seqno;
        a5xx_flush(gpu, ring, true);
        a5xx_preempt_trigger(gpu, true);
 
@@ -210,6 +213,7 @@ static void a5xx_submit(struct msm_gpu *gpu, struct 
msm_gem_submit *submit)
        /* Write the fence to the scratch register */
        OUT_PKT4(ring, REG_A5XX_CP_SCRATCH_REG(2), 1);
        OUT_RING(ring, submit->seqno);
+       a5xx_gpu->last_seqno[ring->id] = submit->seqno;
 
        /*
         * Execute a CACHE_FLUSH_TS event. This will ensure that the
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h 
b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h
index 1120824853d4..7269eaab9a7a 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h
@@ -34,6 +34,7 @@ struct a5xx_gpu {
        struct drm_gem_object *preempt_counters_bo[MSM_GPU_MAX_RINGS];
        struct a5xx_preempt_record *preempt[MSM_GPU_MAX_RINGS];
        uint64_t preempt_iova[MSM_GPU_MAX_RINGS];
+       uint32_t last_seqno[MSM_GPU_MAX_RINGS];
 
        atomic_t preempt_state;
        struct timer_list preempt_timer;
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c 
b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
index f8d09a83c5ae..6bd92f9b2338 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
@@ -55,6 +55,8 @@ static inline void update_wptr(struct msm_gpu *gpu, struct 
msm_ringbuffer *ring)
 /* Return the highest priority ringbuffer with something in it */
 static struct msm_ringbuffer *get_next_ring(struct msm_gpu *gpu)
 {
+       struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+       struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu);
        unsigned long flags;
        int i;
 
@@ -64,6 +66,8 @@ static struct msm_ringbuffer *get_next_ring(struct msm_gpu 
*gpu)
 
                spin_lock_irqsave(&ring->preempt_lock, flags);
                empty = (get_wptr(ring) == gpu->funcs->get_rptr(gpu, ring));
+               if (!empty && ring == a5xx_gpu->cur_ring)
+                       empty = ring->memptrs->fence == a5xx_gpu->last_seqno[i];
                spin_unlock_irqrestore(&ring->preempt_lock, flags);
 
                if (!empty)
-- 
2.45.2