On 18/03/2019 09:51, Chris Wilson wrote:
On unpinning the intel_context, we remove it from the active list
inside the GEM context. This list is supposed to be guarded by the GEM
context mutex, so remember to take it!
Fixes: ?
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_context.c | 15 +++++++++++----
drivers/gpu/drm/i915/intel_lrc.c | 3 ---
drivers/gpu/drm/i915/intel_ringbuffer.c | 3 ---
drivers/gpu/drm/i915/selftests/mock_engine.c | 2 --
4 files changed, 11 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_context.c
b/drivers/gpu/drm/i915/intel_context.c
index 5a16c9bb2778..0ab894a058f6 100644
--- a/drivers/gpu/drm/i915/intel_context.c
+++ b/drivers/gpu/drm/i915/intel_context.c
@@ -165,13 +165,13 @@ intel_context_pin(struct i915_gem_context *ctx,
if (err)
goto err;
+ i915_gem_context_get(ctx);
+ GEM_BUG_ON(ce->gem_context != ctx);
+
mutex_lock(&ctx->mutex);
list_add(&ce->active_link, &ctx->active_engines);
mutex_unlock(&ctx->mutex);
- i915_gem_context_get(ctx);
- GEM_BUG_ON(ce->gem_context != ctx);
-
smp_mb__before_atomic(); /* flush pin before it is visible */
}
@@ -194,9 +194,16 @@ void intel_context_unpin(struct intel_context *ce)
/* We may be called from inside intel_context_pin() to evict another */
mutex_lock_nested(&ce->pin_mutex, SINGLE_DEPTH_NESTING);
Hm is the nested annotation and comment correct? Looking at it now, the
allocations happen outside pin_mutex.
Regards,
Tvrtko
- if (likely(atomic_dec_and_test(&ce->pin_count)))
+ if (likely(atomic_dec_and_test(&ce->pin_count))) {
ce->ops->unpin(ce);
+ mutex_lock(&ce->gem_context->mutex);
+ list_del(&ce->active_link);
+ mutex_unlock(&ce->gem_context->mutex);
+
+ i915_gem_context_put(ce->gem_context);
+ }
+
mutex_unlock(&ce->pin_mutex);
}
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index d3f1fe06d013..13f5545fc1d2 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1306,9 +1306,6 @@ static void execlists_context_unpin(struct intel_context
*ce)
i915_gem_object_unpin_map(ce->state->obj);
__context_unpin(ce->state);
-
- list_del(&ce->active_link);
- i915_gem_context_put(ce->gem_context);
}
static void
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 45a54fadc482..6d60bc258feb 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1415,9 +1415,6 @@ static void ring_context_unpin(struct intel_context *ce)
{
__context_unpin_ppgtt(ce->gem_context);
__context_unpin(ce);
-
- list_del(&ce->active_link);
- i915_gem_context_put(ce->gem_context);
}
static struct i915_vma *
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c
b/drivers/gpu/drm/i915/selftests/mock_engine.c
index 881450c694e9..7641b74ada98 100644
--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -126,8 +126,6 @@ static void hw_delay_complete(struct timer_list *t)
static void mock_context_unpin(struct intel_context *ce)
{
mock_timeline_unpin(ce->ring->timeline);
- list_del(&ce->active_link);
- i915_gem_context_put(ce->gem_context);
}
static void mock_context_destroy(struct intel_context *ce)
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