On 12/08/2017 03:03 PM, Chris Wilson wrote:
Quoting Jackie Li (2017-12-08 21:41:51)
+static inline int cnl_a0_wopcm_size_check(struct drm_i915_private *i915)
+{
+ struct intel_guc_wopcm *wopcm = &i915->guc.wopcm;
+ u32 huc_size = intel_uc_fw_get_size(&i915->huc.fw);
+
+ /*
+ * On CNL A0, hardware requires guc size to be larger than or equal to
+ * HuC kernel size.
+ */
I couldn't find anything that told me that wopcm->size had to be greater
than GEN10_GUC_WOPCM_OFFSET. Either that is always true by construction,
in which case GEM_BUG_ON() here, or it may be too small in which case
add the test.
It's a known HW limitation on CNL A0. And Yes, it should be unlikely to
happen,
but once it happened, we only want to disable GuC loading and submission.
+ if ((wopcm->size - GEN10_GUC_WOPCM_OFFSET) < huc_size)
((((Do) you) like) brackets)?
Will Fix it. :-) Thanks!
-Chris
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