diff options
author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-08-08 21:27:58 +0100 |
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committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-08-08 21:28:51 +0100 |
commit | c7302f204490f3eb4ef839bec228315bcd3ba43f (patch) | |
tree | 3ddd1c797a3fe06946dfd7d3dc91a916aa1f23d8 /drivers/gpu/drm/i915/gt/intel_engine_pm.h | |
parent | cbb153c50ebe4f635d970a1685302288e3f573fe (diff) |
drm/i915: Defer final intel_wakeref_put to process context
As we need to acquire a mutex to serialise the final
intel_wakeref_put, we need to ensure that we are in process context at
that time. However, we want to allow operation on the intel_wakeref from
inside timer and other hardirq context, which means that need to defer
that final put to a workqueue.
Inside the final wakeref puts, we are safe to operate in any context, as
we are simply marking up the HW and state tracking for the potential
sleep. It's only the serialisation with the potential sleeping getting
that requires careful wait avoidance. This allows us to retain the
immediate processing as before (we only need to sleep over the same
races as the current mutex_lock).
v2: Add a selftest to ensure we exercise the code while lockdep watches.
v3: That test was extremely loud and complained about many things!
v4: Not a whale!
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111295
References: https://bugs.freedesktop.org/show_bug.cgi?id=111245
References: https://bugs.freedesktop.org/show_bug.cgi?id=111256
Fixes: 18398904ca9e ("drm/i915: Only recover active engines")
Fixes: 51fbd8de87dc ("drm/i915/pmu: Atomically acquire the gt_pm wakeref")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190808202758.10453-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_engine_pm.h')
-rw-r--r-- | drivers/gpu/drm/i915/gt/intel_engine_pm.h | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_pm.h b/drivers/gpu/drm/i915/gt/intel_engine_pm.h index 015ac72d7ad0..739c50fefcef 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_pm.h +++ b/drivers/gpu/drm/i915/gt/intel_engine_pm.h @@ -10,24 +10,26 @@ #include "intel_engine_types.h" #include "intel_wakeref.h" -struct drm_i915_private; - -void intel_engine_pm_get(struct intel_engine_cs *engine); -void intel_engine_pm_put(struct intel_engine_cs *engine); - static inline bool intel_engine_pm_is_awake(const struct intel_engine_cs *engine) { return intel_wakeref_is_active(&engine->wakeref); } -static inline bool -intel_engine_pm_get_if_awake(struct intel_engine_cs *engine) +static inline void intel_engine_pm_get(struct intel_engine_cs *engine) +{ + intel_wakeref_get(&engine->wakeref); +} + +static inline bool intel_engine_pm_get_if_awake(struct intel_engine_cs *engine) { return intel_wakeref_get_if_active(&engine->wakeref); } -void intel_engine_park(struct intel_engine_cs *engine); +static inline void intel_engine_pm_put(struct intel_engine_cs *engine) +{ + intel_wakeref_put(&engine->wakeref); +} void intel_engine_init__pm(struct intel_engine_cs *engine); |