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

[Philip Müller]

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