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drm/i915: Provide an assert for when we expect forcewake to be held

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Add assert_forcewakes_active() (the complementary function to
assert_forcewakes_inactive) that documents the requirement of a
function for its callers to be holding the forcewake ref (i.e. the
function is part of a sequence over which RC6 must be prevented).

One such example is during ringbuffer reset, where RC6 must be held
across the whole reinitialisation sequence.

v2: Include debug information in the WARN so we know which fw domain is
missing.

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> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20171009110301.21705-5-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-10-09 12:03:01 +01:00
parent ff97d3ae69
commit 67e6456485
3 changed files with 29 additions and 2 deletions
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11
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -579,7 +579,16 @@ out:
static void reset_ring_common(struct intel_engine_cs *engine,
struct drm_i915_gem_request *request)
{
/* Try to restore the logical GPU state to match the continuation
/*
* RC6 must be prevented until the reset is complete and the engine
* reinitialised. If it occurs in the middle of this sequence, the
* state written to/loaded from the power context is ill-defined (e.g.
* the PP_BASE_DIR may be lost).
*/
assert_forcewakes_active(engine->i915, FORCEWAKE_ALL);
/*
* Try to restore the logical GPU state to match the continuation
* of the request queue. If we skip the context/PD restore, then
* the next request may try to execute assuming that its context
* is valid and loaded on the GPU and so may try to access invalid

18
drivers/gpu/drm/i915/intel_uncore.c
View File

@ -626,7 +626,23 @@ void assert_forcewakes_inactive(struct drm_i915_private *dev_priv)
if (!dev_priv->uncore.funcs.force_wake_get)
return;
WARN_ON(dev_priv->uncore.fw_domains_active);
WARN(dev_priv->uncore.fw_domains_active,
"Expected all fw_domains to be inactive, but %08x are still on\n",
dev_priv->uncore.fw_domains_active);
}
void assert_forcewakes_active(struct drm_i915_private *dev_priv,
enum forcewake_domains fw_domains)
{
if (!dev_priv->uncore.funcs.force_wake_get)
return;
assert_rpm_wakelock_held(dev_priv);
fw_domains &= dev_priv->uncore.fw_domains;
WARN(fw_domains & ~dev_priv->uncore.fw_domains_active,
"Expected %08x fw_domains to be active, but %08x are off\n",
fw_domains, fw_domains & ~dev_priv->uncore.fw_domains_active);
}
/* We give fast paths for the really cool registers */

2
drivers/gpu/drm/i915/intel_uncore.h
View File

@ -137,6 +137,8 @@ void intel_uncore_resume_early(struct drm_i915_private *dev_priv);
u64 intel_uncore_edram_size(struct drm_i915_private *dev_priv);
void assert_forcewakes_inactive(struct drm_i915_private *dev_priv);
void assert_forcewakes_active(struct drm_i915_private *dev_priv,
enum forcewake_domains fw_domains);
const char *intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id);
enum forcewake_domains