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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-04-11 18:58:50 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-04-12 09:44:08 +0100 |
| commit | 48921260b7d030ec6a2e11a435eae28ddb88ea56 (patch) | |
| tree | b4469c3dc070bf13dea434d88c785d08a8498061 /drivers/gpu/drm/i915/intel_lrc.c | |
| parent | ebf3f19abbfd041a0e79a523e4dd1f6f6797b783 (diff) | |
| download | op-kernel-dev-48921260b7d030ec6a2e11a435eae28ddb88ea56.zip op-kernel-dev-48921260b7d030ec6a2e11a435eae28ddb88ea56.tar.gz | |
drm/i915/execlists: Document runtime pm for intel_lrc_irq_handler()
We indirectly hold the runtime-pm for the intel_lrc_irq_handler() by
virtue of dev_priv->gt.awake keeping a wakeref whilst the requests are
busy. As this is not obvious from the code, add a comment.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170411175850.2470-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_lrc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 711125a..7df278f 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -515,6 +515,15 @@ static void intel_lrc_irq_handler(unsigned long data) struct execlist_port *port = engine->execlist_port; struct drm_i915_private *dev_priv = engine->i915; + /* We can skip acquiring intel_runtime_pm_get() here as it was taken + * on our behalf by the request (see i915_gem_mark_busy()) and it will + * not be relinquished until the device is idle (see + * i915_gem_idle_work_handler()). As a precaution, we make sure + * that all ELSP are drained i.e. we have processed the CSB, + * before allowing ourselves to idle and calling intel_runtime_pm_put(). + */ + GEM_BUG_ON(!dev_priv->gt.awake); + intel_uncore_forcewake_get(dev_priv, engine->fw_domains); /* Prefer doing test_and_clear_bit() as a two stage operation to avoid |
