drm/i915: Tidy up engine reset logic

Split engine reset for engine and request specific parts.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1484668747-9120-5-git-send-email-mika.kuoppala@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e2a6f48..832ad09 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2679,10 +2679,26 @@ static void engine_skip_context(struct drm_i915_gem_request *request)
        spin_unlock_irqrestore(&engine->timeline->lock, flags);
 }
 
+/* Returns true if the request was guilty of hang */
+static bool i915_gem_reset_request(struct drm_i915_gem_request *request)
+{
+       /* Read once and return the resolution */
+       const bool guilty = engine_stalled(request->engine);
+
+       if (guilty) {
+               i915_gem_context_mark_guilty(request->ctx);
+               skip_request(request);
+       } else {
+               i915_gem_context_mark_innocent(request->ctx);
+               dma_fence_set_error(&request->fence, -EAGAIN);
+       }
+
+       return guilty;
+}
+
 static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 {
        struct drm_i915_gem_request *request;
-       struct i915_gem_context *hung_ctx;
 
        if (engine->irq_seqno_barrier)
                engine->irq_seqno_barrier(engine);
@@ -2691,16 +2707,8 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
        if (!request)
                return;
 
-       hung_ctx = request->ctx;
-
-       if (engine_stalled(engine)) {
-               i915_gem_context_mark_guilty(hung_ctx);
-               skip_request(request);
-       } else {
-               i915_gem_context_mark_innocent(hung_ctx);
-               dma_fence_set_error(&request->fence, -EAGAIN);
+       if (!i915_gem_reset_request(request))
                return;
-       }
 
        DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
                         engine->name, request->global_seqno);
@@ -2709,7 +2717,7 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
        engine->reset_hw(engine, request);
 
        /* If this context is now banned, skip all of its pending requests. */
-       if (i915_gem_context_is_banned(hung_ctx))
+       if (i915_gem_context_is_banned(request->ctx))
                engine_skip_context(request);
 }