drm/ttm: Use VM_PFNMAP for shared bo maps

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.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index b249ab9..cdda784 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -220,7 +220,11 @@ 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.
@@ -319,7 +323,14 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
         */
 
        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);
@@ -334,7 +345,8 @@ 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);