From: Chris Wilson Date: Mon, 18 Mar 2019 09:51:49 +0000 (+0000) Subject: drm/i915: Stop needlessly acquiring wakeref for debugfs/drop_caches_set X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=6cffeb83c763235718102e9eca65e6452ac12ca7;p=openwrt%2Fstaging%2Fblogic.git drm/i915: Stop needlessly acquiring wakeref for debugfs/drop_caches_set We only need to acquire a wakeref for ourselves for a few operations, as most either already acquire their own wakeref or imply a wakeref. In particular, it is i915_gem_set_wedged() that needed us to present it with a wakeref, which is incongruous with its "use anywhere" ability. Suggested-by: "Yokoyama, Caz" Signed-off-by: Chris Wilson Cc: "Yokoyama, Caz" Cc: Mika Kuoppala Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20190318095204.9913-7-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 6a90558de213..08683dca7775 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -3888,12 +3888,9 @@ static int i915_drop_caches_set(void *data, u64 val) { struct drm_i915_private *i915 = data; - intel_wakeref_t wakeref; - int ret = 0; DRM_DEBUG("Dropping caches: 0x%08llx [0x%08llx]\n", val, val & DROP_ALL); - wakeref = intel_runtime_pm_get(i915); if (val & DROP_RESET_ACTIVE && wait_for(intel_engines_are_idle(i915), I915_IDLE_ENGINES_TIMEOUT)) @@ -3902,9 +3899,11 @@ i915_drop_caches_set(void *data, u64 val) /* No need to check and wait for gpu resets, only libdrm auto-restarts * on ioctls on -EAGAIN. */ if (val & (DROP_ACTIVE | DROP_RETIRE | DROP_RESET_SEQNO)) { + int ret; + ret = mutex_lock_interruptible(&i915->drm.struct_mutex); if (ret) - goto out; + return ret; if (val & DROP_ACTIVE) ret = i915_gem_wait_for_idle(i915, @@ -3943,10 +3942,7 @@ i915_drop_caches_set(void *data, u64 val) if (val & DROP_FREED) i915_gem_drain_freed_objects(i915); -out: - intel_runtime_pm_put(i915, wakeref); - - return ret; + return 0; } DEFINE_SIMPLE_ATTRIBUTE(i915_drop_caches_fops, diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c index 861fe083e383..fb86d5ca5d8b 100644 --- a/drivers/gpu/drm/i915/i915_reset.c +++ b/drivers/gpu/drm/i915/i915_reset.c @@ -863,9 +863,11 @@ static void __i915_gem_set_wedged(struct drm_i915_private *i915) void i915_gem_set_wedged(struct drm_i915_private *i915) { struct i915_gpu_error *error = &i915->gpu_error; + intel_wakeref_t wakeref; mutex_lock(&error->wedge_mutex); - __i915_gem_set_wedged(i915); + with_intel_runtime_pm(i915, wakeref) + __i915_gem_set_wedged(i915); mutex_unlock(&error->wedge_mutex); }