leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/rockchip: Respect page offset for PRIME mmap calls

Browse Source 
When mapping external DMA-bufs through the PRIME mmap call, we might be
given an offset which has to be respected. However for the internal DRM
GEM mmap path, we have to ignore the fake mmap offset used to identify
the buffer only. Currently the code always zeroes out vma->vm_pgoff,
which breaks the former.

This patch fixes the problem by moving the vm_pgoff assignment to a
function that is used only for GEM mmap path, so that the PRIME path
retains the original offset.

Cc: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Ørjan Eide <orjan.eide@arm.com>
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20180130202913.28724-4-thierry.escande@collabora.com
This commit is contained in:
Ørjan Eide 2018-01-30 21:28:33 +01:00 committed by Heiko Stuebner
parent 6fd0bfe2f7
commit 57de50af16
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/rockchip/rockchip_drm_gem.c
View File

@ -264,7 +264,6 @@ static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
* VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
*/
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_pgoff = 0;
if (rk_obj->pages)
ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
@ -299,6 +298,12 @@ int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
if (ret)
return ret;
/*
* 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 = vma->vm_private_data;
return rockchip_drm_gem_object_mmap(obj, vma);