Re: [Regression] drm/i915: Don't use BAR mappings for ring buffers with LLC alone creates issues in stable kernels

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On 21.03.23 14:12, Greg Kroah-Hartman wrote:
On Tue, Mar 21, 2023 at 07:58:44AM +0700, Philip Müller wrote:
On 20.03.23 20:28, Greg Kroah-Hartman wrote:
On Sun, Mar 19, 2023 at 10:01:01AM +0700, Philip Müller wrote:
Have to correct the affected kernels to these: 4.14.310, 4.19.278, 5.4.237,
5.10.175

Please don't top-post :(

Anyway, should be fixed in the next round of releases in a few days, if
not, please let us know.

greg k-h

Hi Greg,

seems the RCs work out. 4.19.279-rc1 and 5.10.176-rc1 were tested by a user
who had the issue on i915. In 5.15 series the drm patch got reverted. I only
see "drm/i915: Don't use stolen memory for ring buffers with LLC" there as
"drm/i915: Don't use BAR mappings for ring buffers with LLC" was reverted
with 5.15.101.

So is 5.15.y ok or not?  Sorry, I could not parse your response here.

thanks,

greg k-h

Hi Greg,

yes, 5.15.y seems to work. You could even re-add the reverted patch from 5.15.101 as we also have tested with it applied on top of 5.15.104-rc1.
--
Best, Philip




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