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SubjectRe: [PATCH 1/2] drm: rockchip: Don't pass DRM fake offset to dma-api
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Am Donnerstag, 16. April 2015, 16:41:51 schrieb Ørjan Eide:
> Set vm_pgoff to 0 after using it to look up the GEM node, before passing
> it on rockchip_gem_mmap_buf() where the offset must be from the start of
> the buffer.
>
> Passing in the fake offset currently works because the
> dma_mmap_attrs implementation that is used for this device,
> arm_iommu_mmap_attrs, ignores the offset completely.
>
> Signed-off-by: Ørjan Eide <orjan.eide@arm.com>

both patches on a rk3288-veyron-pinky

Tested-by: Heiko Stuebner <heiko@sntech.de>

Through which tree do you want to take these patches? I guess the rockchip-drm
related patch should go through the tree that will take the dma-mapping patch,
so you'll probably need an "Ack" from Mark Yao (Cc'ed).


Heiko

> ---
> drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c index 7ca8799e..69f01c3
> 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> @@ -94,6 +94,11 @@ int rockchip_gem_mmap(struct file *filp, struct
> vm_area_struct *vma) return -EACCES;
> }
>
> + /* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
> + * whole buffer from the start.
> + */
> + vma->vm_pgoff = 0;
> +
> obj = container_of(node, struct drm_gem_object, vma_node);
> ret = rockchip_gem_mmap_buf(obj, vma);



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