[PATCH v12 1/1] drm/i915: Allow user to set cache at BO creation

[Andi Shyti]

Hi Carl,

On Wed, May 31, 2023 at 12:24:07PM +0000, Zhang, Carl wrote:
> Hi Andi & Fei,
> We verified your change by UMD change:
> 1. implement the uAPI by
>  https://github.com/intel/media-driver/commit/92c00a857433ebb34ec575e9834f473c6fcb6341
> 2. old kernel may not support new uAPI, so UMD try the interface firstly, if it failed, will fallback to older interfaces
> https://github.com/intel/media-driver/commit/fd375cf2c5e1f6bf6b43258ff797b3134aadc9fd
> 3. removed some check for CPU cacheable and PAT conflict 
>  https://github.com/intel/media-driver/commit/08dd244b22484770a33464c2c8ae85430e548000

Thanks a lot... we can add these commits in the log, as well.

> after that, UMD works with your patches serious on MTL.
> 
> Acked-by: Carl Zhang <carl.zhang at intel.com>
> Tested-by: Lihao Gu <lihao.gu at intel.com>

Thanks Carl and Lihao! Very appreciated :)

Andi

> Thanks
> Carl
> > -----Original Message-----
> > From: Andi Shyti <andi.shyti at linux.intel.com>
> > Sent: Wednesday, May 31, 2023 6:49 PM
> > To: Yang, Fei <fei.yang at intel.com>; Zhang, Carl <carl.zhang at intel.com>
> > Cc: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org; Vivi,
> > Rodrigo <rodrigo.vivi at intel.com>; andi.shyti at linux.intel.com; Chris Wilson
> > <chris.p.wilson at linux.intel.com>; Roper, Matthew D
> > <matthew.d.roper at intel.com>; Justen, Jordan L <jordan.l.justen at intel.com>
> > Subject: Re: [PATCH v12 1/1] drm/i915: Allow user to set cache at BO creation
> > 
> > Hi Carl,
> > 
> > On Wed, May 24, 2023 at 01:02:55PM -0700, fei.yang at intel.com wrote:
> > > From: Fei Yang <fei.yang at intel.com>
> > >
> > > To comply with the design that buffer objects shall have immutable
> > > cache setting through out their life cycle, {set, get}_caching ioctl's
> > > are no longer supported from MTL onward. With that change caching
> > > policy can only be set at object creation time. The current code
> > > applies a default (platform dependent) cache setting for all objects.
> > > However this is not optimal for performance tuning. The patch extends
> > > the existing gem_create uAPI to let user set PAT index for the object
> > > at creation time.
> > > The new extension is platform independent, so UMD's can switch to
> > > using this extension for older platforms as well, while {set,
> > > get}_caching are still supported on these legacy paltforms for compatibility
> > reason.
> > >
> > > BSpec: 45101
> > >
> > > Test igt at gem_create@create_ext_set_pat posted at
> > > https://patchwork.freedesktop.org/series/118314/
> > >
> > > Tested with
> > > https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22878
> > >
> > > Signed-off-by: Fei Yang <fei.yang at intel.com>
> > > Cc: Chris Wilson <chris.p.wilson at linux.intel.com>
> > > Cc: Matt Roper <matthew.d.roper at intel.com>
> > > Cc: Andi Shyti <andi.shyti at linux.intel.com>
> > > Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>
> > > Acked-by: Jordan Justen <jordan.l.justen at intel.com>
> > > Tested-by: Jordan Justen <jordan.l.justen at intel.com>
> > 
> > was it your intention to ack this patch?
> > 
> > Thanks,
> > Andi
>