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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-07-15 10:09:28 +0200 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-07-16 14:19:34 +0200 |
| commit | cfe7288c276e359eebf057699fe86c2f8af14224 (patch) | |
| tree | 1befcc2a23eaeea60d75b19087505f645b5ea8e1 /drivers/gpu/drm/i915/i915_gpu_error.c | |
| parent | drm/i915: Enable hotplug retry (diff) | |
| download | linux-cfe7288c276e359eebf057699fe86c2f8af14224.tar.xz linux-cfe7288c276e359eebf057699fe86c2f8af14224.zip | |
drm/i915: Lock the engine while dumping the active request
We cannot let the request be retired and freed while we are trying to
dump it during error capture. It is not sufficient just to grab a
reference to the request, as during retirement we may free the ring
which we are also dumping. So take the engine lock to prevent retiring
and freeing of the request.
Reported-by: Alex Shumsky <alexthreed@gmail.com>
Fixes: 83c317832eb1 ("drm/i915: Dump the ringbuffer of the active request for debugging")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Alex Shumsky <alexthreed@gmail.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190715080946.15593-6-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gpu_error.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gpu_error.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 78e388fa059c..c5b89bf4d616 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1411,6 +1411,7 @@ static void gem_record_rings(struct i915_gpu_state *error) struct intel_engine_cs *engine = i915->engine[i]; struct drm_i915_error_engine *ee = &error->engine[i]; struct i915_request *request; + unsigned long flags; ee->engine_id = -1; @@ -1422,10 +1423,11 @@ static void gem_record_rings(struct i915_gpu_state *error) error_record_engine_registers(error, engine, ee); error_record_engine_execlists(engine, ee); + spin_lock_irqsave(&engine->active.lock, flags); request = intel_engine_find_active_request(engine); if (request) { struct i915_gem_context *ctx = request->gem_context; - struct intel_ring *ring; + struct intel_ring *ring = request->ring; ee->vm = ctx->vm ?: &engine->gt->ggtt->vm; @@ -1455,7 +1457,6 @@ static void gem_record_rings(struct i915_gpu_state *error) ee->rq_post = request->postfix; ee->rq_tail = request->tail; - ring = request->ring; ee->cpu_ring_head = ring->head; ee->cpu_ring_tail = ring->tail; ee->ringbuffer = @@ -1463,6 +1464,7 @@ static void gem_record_rings(struct i915_gpu_state *error) engine_record_requests(engine, request, ee); } + spin_unlock_irqrestore(&engine->active.lock, flags); ee->hws_page = i915_error_object_create(i915, |