[PATCH 0/9] drm/exynos: update codes related with gem

[Daniel Vetter]

On Tue, Oct 13, 2015 at 04:00:45PM +0900, Joonyoung Shim wrote:
> Hi,
> 
> This patchset is about gem codes update of exynos-drm.
> 
> The first and second patches are cleanup to remove useless codes.
> The rest is to support cachable gem allocation.
> 
> The exynos-drm uses DMA mapping API to allocate/mmap buffer of gem. If
> it is cachable, does it with DMA_ATTR_NON_CONSISTENT attribute, but
> DMA_ATTR_NON_CONSISTENT isn't supported in DMA mapping API of ARM, so it
> doesn't give any effects.
> 
> This patchset introduces new buffer allocation to use
> drm_gem_get/put_pages() instead of DMA mapping API. It will be used
> for the rest except allocation of physically continuous buffer on
> non-iommu, then exynos-drm can support cachable buffer of gem. Also it
> can support physically non-continuous buffer on non-iommu.
> 
> EXYNOS_BO_CONTIG flag on iommu is ambiguous because it doesn't care
> whether buffer is continuous physically if iommu is supported. This
> patchset always will use EXYNOS_BO_CONTIG flag on iommu and then can
> mean that the buffer is continuous for device.
> 
> There is no user API to control cache coherence for the cpu and device
> about cachable buffer. This patchset introduces two ioctls for cpu
> access of gem object from user. It will be synced properly in order for
> the cpu and device if buffer of gem object is cachable.

Out of curiosity, where's the userspace part for this work? Usually kernel
abi extensions come with a link to the relevant branch for easier review.
-Daniel

> 
> Thanks.
> 
> Joonyoung Shim (9):
>   drm/exynos: eliminate useless codes of exynos_drm_gem.h
>   drm/exynos: use directly DMA mapping APIs on g2d
>   drm/exynos: remove using non-consistent DMA attribute
>   drm/exynos: split buffer allocation using DMA mapping API on non-iommu
>   drm/exynos: introduce buffer allocation using drm_gem_get/put_pages()
>   drm/exynos: switch to new buffer allocation
>   drm/exynos: always use EXYNOS_BO_CONTIG flag on iommu
>   drm/exynos: use DMA_ERROR_CODE
>   drm/exynos: add ioctls for cpu access of gem object from user
> 
>  drivers/gpu/drm/exynos/exynos_drm_drv.c   |   4 +
>  drivers/gpu/drm/exynos/exynos_drm_fb.c    |  32 +---
>  drivers/gpu/drm/exynos/exynos_drm_fbdev.c |  14 +-
>  drivers/gpu/drm/exynos/exynos_drm_g2d.c   |  10 +-
>  drivers/gpu/drm/exynos/exynos_drm_gem.c   | 288 ++++++++++++++++++------------
>  drivers/gpu/drm/exynos/exynos_drm_gem.h   |  56 ++----
>  include/uapi/drm/exynos_drm.h             |  23 ++-
>  7 files changed, 225 insertions(+), 202 deletions(-)
> 
> -- 
> 1.9.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch