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drm/cma-helper: Set VM_DONTEXPAND for mmap
commit59f39bfa65
upstream. drm_gem_cma_mmap() cannot assume every implementation of dma_mmap_wc() will end up calling remap_pfn_range() (which happens to set the relevant vma flag, among others), so in order to make sure expectations around VM_DONTEXPAND are met, let it explicitly set the flag like most other GEM mmap implementations do. This avoids repeated warnings on a small minority of systems where the display is behind an IOMMU, and has a simple driver which does not override drm_gem_cma_default_funcs. Arm hdlcd is an in-tree affected driver. Out-of-tree, the Apple DCP driver is affected; this fix is required for DCP to be mainlined. [Alyssa: Update commit message.] Fixes:c40069cb7b
("drm: add mmap() to drm_gem_object_funcs") Acked-by: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211013143654.39031-1-alyssa@rosenzweig.io Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -515,6 +515,7 @@ int drm_gem_cma_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
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*/
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vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
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vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_flags |= VM_DONTEXPAND;
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cma_obj = to_drm_gem_cma_obj(obj);
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cma_obj = to_drm_gem_cma_obj(obj);
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