We reserve the space for the power context in stolen memory at a fixed
address from a delayed work. This races with the subsequent driver
init/resume code which could allocate something at that address, so the
reservation for the power context fails. Reserve the space up-front, so
this can't happen. This also adds a missing struct_mutex lock around the
stolen allocation, which wasn't taken in the delayed work path.
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 87999d3..fd4c983 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3554,6 +3554,8 @@ static void valleyview_setup_pctx(struct drm_device *dev)
u32 pcbr;
int pctx_size = 24*1024;
+ WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+
pcbr = I915_READ(VLV_PCBR);
if (pcbr) {
/* BIOS set it up already, grab the pre-alloc'd space */
@@ -3603,8 +3605,6 @@ static void valleyview_enable_rps(struct drm_device *dev)
I915_WRITE(GTFIFODBG, gtfifodbg);
}
- valleyview_setup_pctx(dev);
-
/* If VLV, Forcewake all wells, else re-direct to regular path */
gen6_gt_force_wake_get(dev_priv, FORCEWAKE_ALL);
@@ -4471,6 +4471,8 @@ void intel_enable_gt_powersave(struct drm_device *dev)
ironlake_enable_rc6(dev);
intel_init_emon(dev);
} else if (IS_GEN6(dev) || IS_GEN7(dev)) {
+ if (IS_VALLEYVIEW(dev))
+ valleyview_setup_pctx(dev);
/*
* PCU communication is slow and this doesn't need to be
* done at any specific time, so do this out of our fast path
--
1.8.4
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