VM_PFNMAP is faster than VM_MIXEDMAP due to reduced page administration so use it for shared maps where we don't have any Copy-On-Write pages. For private maps, we continue to use VM_MIXEDMAP. This might also help a bit for bo mmap dirty tracking, if implemented, depending on the used interface. Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx> --- drivers/gpu/drm/ttm/ttm_bo_vm.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index ac617f3..05f4bd9 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -206,7 +206,11 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) pfn = page_to_pfn(page); } - ret = vm_insert_mixed(&cvma, address, pfn); + if (vma->vm_flags & VM_MIXEDMAP) + ret = vm_insert_mixed(&cvma, address, pfn); + else + ret = vm_insert_pfn(&cvma, address, pfn); + /* * Somebody beat us to this PTE or prefaulting to * an already populated PTE, or prefaulting error. @@ -303,9 +307,15 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, * Note: We're transferring the bo reference to * vma->vm_private_data here. */ - vma->vm_private_data = bo; - vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP; + + /* + * PFNMAP is faster than MIXEDMAP due to reduced page + * administration. So use MIXEDMAP only if private VMA, where + * we need to support COW. + */ + vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP; + vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; return 0; out_unref: ttm_bo_unref(&bo); @@ -320,7 +330,8 @@ int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) vma->vm_ops = &ttm_bo_vm_ops; vma->vm_private_data = ttm_bo_reference(bo); - vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; + vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP; + vma->vm_flags |= VM_IO | VM_DONTEXPAND; return 0; } EXPORT_SYMBOL(ttm_fbdev_mmap); -- 1.7.10.4 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
