On 30/08/2019 17:40, Chris Wilson wrote:
We use the context->pin_mutex to serialise updates to the OA config and
the registers values written into each new context. Document this
relationship and assert we do hold the context->pin_mutex as used by
gen8_configure_all_contexts() to serialise updates to the OA config
itself.
Signed-off-by: Chris Wilson <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Thanks, that's helpful to remember why it works :)
Reviewed-by: Lionel Landwerlin <[email protected]>
---
drivers/gpu/drm/i915/i915_perf.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 2c9f46e12622..c1b764233761 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -2305,6 +2305,9 @@ void i915_oa_init_reg_state(struct intel_engine_cs
*engine,
{
struct i915_perf_stream *stream;
+ /* perf.exclusive_stream serialised by gen8_configure_all_contexts() */
+ lockdep_assert_held(&ce->pin_mutex);
+
if (engine->class != RENDER_CLASS)
return;
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