Re: [PATCH 0/3] iommu/drm/msm: Allow non-coherent masters to use system cache

[Sai Prakash Ranjan]

Hi Georgi,

On 2021-07-28 19:30, Georgi Djakov wrote:
> On Mon, Jan 11, 2021 at 07:45:02PM +0530, Sai Prakash Ranjan wrote:
> > commit ecd7274fb4cd ("iommu: Remove unused IOMMU_SYS_CACHE_ONLY flag")
> > removed unused IOMMU_SYS_CACHE_ONLY prot flag and along with it went
> > the memory type setting required for the non-coherent masters to use
> > system cache. Now that system cache support for GPU is added, we will
> > need to set the right PTE attribute for GPU buffers to be sys cached.
> > Without this, the system cache lines are not allocated for GPU.
> >
> > So the patches in this series introduces a new prot flag IOMMU_LLC,
> > renames IO_PGTABLE_QUIRK_ARM_OUTER_WBWA to IO_PGTABLE_QUIRK_PTW_LLC
> > and makes GPU the user of this protection flag.
>
> Hi Sai,
>
> Thank you for the patchset! Are you planning to refresh it, as it does
> not apply anymore?

I was waiting on Will's reply [1]. If there are no changes needed, then
I can repost the patch.

[1] 
https://lore.kernel.org/lkml/21239ba603d0bdc4e4c696588a905f88@xxxxxxxxxxxxxx/

Thanks,
Sai

> > The series slightly depends on following 2 patches posted earlier and
> > is based on msm-next branch:
> >  * https://lore.kernel.org/patchwork/patch/1363008/
> >  * https://lore.kernel.org/patchwork/patch/1363010/
> >
> > Sai Prakash Ranjan (3):
> >   iommu/io-pgtable: Rename last-level cache quirk to
> >     IO_PGTABLE_QUIRK_PTW_LLC
> >   iommu/io-pgtable-arm: Add IOMMU_LLC page protection flag
> >   drm/msm: Use IOMMU_LLC page protection flag to map gpu buffers
> >
> >  drivers/gpu/drm/msm/adreno/a6xx_gpu.c   | 3 +++
> >  drivers/gpu/drm/msm/adreno/adreno_gpu.c | 2 +-
> >  drivers/gpu/drm/msm/msm_iommu.c         | 3 +++
> >  drivers/gpu/drm/msm/msm_mmu.h           | 4 ++++
> >  drivers/iommu/io-pgtable-arm.c          | 9 ++++++---
> >  include/linux/io-pgtable.h              | 6 +++---
> >  include/linux/iommu.h                   | 6 ++++++
> >  7 files changed, 26 insertions(+), 7 deletions(-)
> >
> >
> > base-commit: 00fd44a1a4700718d5d962432b55c09820f7e709
> > --
> > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a 
> > member
> > of Code Aurora Forum, hosted by The Linux Foundation

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