Re: [PATCH v3] drm/i915: Flush WC GGTT only on required platforms

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Hi Andi,

On 10/18/2023 1:49 PM, Andi Shyti wrote:
Hi Nirmoy,

On Wed, Oct 18, 2023 at 11:38:15AM +0200, Nirmoy Das wrote:
gen8_ggtt_invalidate() is only needed for limited set of platforms
where GGTT is mapped as WC. This was added as way to fix WC based GGTT in
commit 0f9b91c754b7 ("drm/i915: flush system agent TLBs on SNB") and
there are no reference in HW docs that forces us to use this on non-WC
backed GGTT.

This can also cause unwanted side-effects on XE_HP platforms where
GFX_FLSH_CNTL_GEN6 is not valid anymore.

v2: Add a func to detect wc ggtt detection (Ville)
v3: Improve commit log and add reference commit (Daniel)

Fixes: d2eae8e98d59 ("drm/i915/dg2: Drop force_probe requirement")
I'm wondering if this is the right Fixes, though. Should this
rather be:

Fixes: 6266992cf105 ("drm/i915/gt: remove GRAPHICS_VER == 10")

Hard to find a real Fixes for this. I just want to backport this to dg2 where we can have unwanted side-effects.


Regards,

Nirmoy


?

Andi



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