From d9e61b66a5d305bbf052a70a853b3be680d911ba Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 13 Feb 2019 18:27:37 +0000 Subject: [PATCH] drm/i915: Defer application of request banning to submission As we currently do not check on submission whether the context is banned in a timely manner it is possible for some requests to escape cancellation after their parent context is banned. By moving the ban into the request submission under the engine->timeline.lock, we serialise it with the reset and setting of the context ban. References: eb8d0f5af4ec ("drm/i915: Remove GPU reset dependence on struct_mutex") Signed-off-by: Chris Wilson Cc: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20190213182737.12695-1-chris@chris-wilson.co.uk Reviewed-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_request.c | 3 +++ drivers/gpu/drm/i915/i915_reset.c | 19 +++++-------------- 2 files changed, 8 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 0acd6baa3c88..5ab4e1c01618 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -366,6 +366,9 @@ void __i915_request_submit(struct i915_request *request) GEM_BUG_ON(!irqs_disabled()); lockdep_assert_held(&engine->timeline.lock); + if (i915_gem_context_is_banned(request->gem_context)) + i915_request_skip(request, -EIO); + GEM_BUG_ON(request->global_seqno); seqno = next_global_seqno(&engine->timeline); diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c index dfced5be1042..5a067a4b3d5d 100644 --- a/drivers/gpu/drm/i915/i915_reset.c +++ b/drivers/gpu/drm/i915/i915_reset.c @@ -22,24 +22,15 @@ static void engine_skip_context(struct i915_request *rq) { struct intel_engine_cs *engine = rq->engine; struct i915_gem_context *hung_ctx = rq->gem_context; - struct i915_timeline *timeline = rq->timeline; lockdep_assert_held(&engine->timeline.lock); - GEM_BUG_ON(timeline == &engine->timeline); - spin_lock(&timeline->lock); - - if (i915_request_is_active(rq)) { - list_for_each_entry_continue(rq, - &engine->timeline.requests, link) - if (rq->gem_context == hung_ctx) - i915_request_skip(rq, -EIO); - } - - list_for_each_entry(rq, &timeline->requests, link) - i915_request_skip(rq, -EIO); + if (!i915_request_is_active(rq)) + return; - spin_unlock(&timeline->lock); + list_for_each_entry_continue(rq, &engine->timeline.requests, link) + if (rq->gem_context == hung_ctx) + i915_request_skip(rq, -EIO); } static void client_mark_guilty(struct drm_i915_file_private *file_priv, -- 2.45.2