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authorChris Wilson <chris@chris-wilson.co.uk>2019-03-18 21:23:46 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2019-03-19 08:21:11 +0000
commit206c2f812fee530f7eda8ad0e97126aec3cd7c43 (patch)
treea0b2f3457f4c0681c692a0420477e219e1b77f39 /drivers/gpu
parent73e97d43666a0a67a2cbeed7b3ce38abdc7cf873 (diff)
drm/i915: Lock the gem_context->active_list while dropping the link
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: 7e3d9a59410d ("drm/i915: Track active engines within a context") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190318212347.30146-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/i915/intel_context.c15
-rw-r--r--drivers/gpu/drm/i915/intel_lrc.c3
-rw-r--r--drivers/gpu/drm/i915/intel_ringbuffer.c3
-rw-r--r--drivers/gpu/drm/i915/selftests/mock_engine.c2
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);
- 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 8d1cb81ba0f5..c949af7be8bd 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1277,9 +1277,6 @@ static void execlists_context_unpin(struct intel_context *ce)
ce->state->obj->pin_global--;
i915_gem_object_unpin_map(ce->state->obj);
i915_vma_unpin(ce->state);
-
- list_del(&ce->active_link);
- i915_gem_context_put(ce->gem_context);
}
static int __context_pin(struct i915_vma *vma)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5137f0140664..81b32bac2bcd 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1430,9 +1430,6 @@ 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)