drm/amdgpu: workaround failed COW checks for Thunk VMAs

KFD Thunk maps invisible VRAM BOs with PROT_NONE, MAP_PRIVATE.
is_cow_mapping returns true for these mappings, which causes mmap to fail
in ttm_bo_mmap_obj.

As a workaround, clear VM_MAYWRITE for PROT_NONE-COW mappings. This
should prevent the mapping from ever becoming writable and makes
is_cow_mapping(vm_flags) false.

Fixes: f91142c62161 ("drm/ttm: nuke VM_MIXEDMAP on BO mappings v3")
Suggested-by: Daniel Vetter <daniel.vetter@intel.com>
Tested-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210715190537.585456-1-Felix.Kuehling@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index b3404c43a9111ebc877b6f7273a7d5a05ebb15e9..9f952b7fc19736da56d0d12eebfc5cbd0cb69318 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -255,6 +255,15 @@ static int amdgpu_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_str
        if (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)
                return -EPERM;
 
+       /* Workaround for Thunk bug creating PROT_NONE,MAP_PRIVATE mappings
+        * for debugger access to invisible VRAM. Should have used MAP_SHARED
+        * instead. Clearing VM_MAYWRITE prevents the mapping from ever
+        * becoming writable and makes is_cow_mapping(vm_flags) false.
+        */
+       if (is_cow_mapping(vma->vm_flags) &&
+           !(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
+               vma->vm_flags &= ~VM_MAYWRITE;
+
        return drm_gem_ttm_mmap(obj, vma);
 }