diff options
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.c | 26 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_scheduler_types.h | 1 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 9df2cb8d66d0..2c0de3a3b8e8 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -1003,6 +1003,15 @@ emit_semaphore_wait(struct i915_request *to, if (!rcu_access_pointer(from->hwsp_cacheline)) goto await_fence; + /* + * If this or its dependents are waiting on an external fence + * that may fail catastrophically, then we want to avoid using + * sempahores as they bypass the fence signaling metadata, and we + * lose the fence->error propagation. + */ + if (from->sched.flags & I915_SCHED_HAS_EXTERNAL_CHAIN) + goto await_fence; + /* Just emit the first semaphore we see as request space is limited. */ if (already_busywaiting(to) & mask) goto await_fence; @@ -1065,12 +1074,29 @@ i915_request_await_request(struct i915_request *to, struct i915_request *from) return ret; } + if (from->sched.flags & I915_SCHED_HAS_EXTERNAL_CHAIN) + to->sched.flags |= I915_SCHED_HAS_EXTERNAL_CHAIN; + return 0; } +static void mark_external(struct i915_request *rq) +{ + /* + * The downside of using semaphores is that we lose metadata passing + * along the signaling chain. This is particularly nasty when we + * need to pass along a fatal error such as EFAULT or EDEADLK. For + * fatal errors we want to scrub the request before it is executed, + * which means that we cannot preload the request onto HW and have + * it wait upon a semaphore. + */ + rq->sched.flags |= I915_SCHED_HAS_EXTERNAL_CHAIN; +} + static int __i915_request_await_external(struct i915_request *rq, struct dma_fence *fence) { + mark_external(rq); return i915_sw_fence_await_dma_fence(&rq->submit, fence, fence->context ? I915_FENCE_TIMEOUT : 0, I915_FENCE_GFP); diff --git a/drivers/gpu/drm/i915/i915_scheduler_types.h b/drivers/gpu/drm/i915/i915_scheduler_types.h index 7186875088a0..6ab2c5289bed 100644 --- a/drivers/gpu/drm/i915/i915_scheduler_types.h +++ b/drivers/gpu/drm/i915/i915_scheduler_types.h @@ -66,6 +66,7 @@ struct i915_sched_node { struct i915_sched_attr attr; unsigned int flags; #define I915_SCHED_HAS_SEMAPHORE_CHAIN BIT(0) +#define I915_SCHED_HAS_EXTERNAL_CHAIN BIT(1) intel_engine_mask_t semaphores; }; |