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 <ch...@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuopp...@intel.com>
---
drivers/gpu/drm/i915/i915_request.c | 3 +++
drivers/gpu/drm/i915/i915_reset.c | 19 ++++---------------
2 files changed, 7 insertions(+), 15 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 12e74decd7a2..c69b520ce1cf 100644
--- a/drivers/gpu/drm/i915/i915_reset.c
+++ b/drivers/gpu/drm/i915/i915_reset.c
@@ -22,24 +22,13 @@ 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);
+ GEM_BUG_ON(!i915_request_is_active(rq));
- 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);
-
- 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,
--
2.20.1
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