drm/radeon/kms: add support for new fault callback V7

This add the support for the new fault callback and also the
infrastructure for supporting unmappable VRAM.

V2 validate BO with no_wait = true
V3 don't derefence bo->mem.mm_node as it's not NULL only for
   VRAM or GTT
V4 update to splitted no_wait ttm change
V5 update to new balanced io_mem_reserve/free change
V6 callback is responsible for iomapping memory
V7 move back iomapping to ttm

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 24 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 4b441f87f47a..57b3f95c0efa 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -498,11 +498,33 @@ void radeon_bo_move_notify(struct ttm_buffer_object *bo,
         radeon_bo_check_tiling(rbo, 0, 1);
 }
 
-void radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
+int radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
 {
+        struct radeon_device *rdev;
         struct radeon_bo *rbo;
+        unsigned long offset, size;
+        int r;
+
         if (!radeon_ttm_bo_is_radeon_bo(bo))
-                return;
+                return 0;
         rbo = container_of(bo, struct radeon_bo, tbo);
         radeon_bo_check_tiling(rbo, 0, 0);
+        rdev = rbo->rdev;
+        if (bo->mem.mem_type == TTM_PL_VRAM) {
+                size = bo->mem.num_pages << PAGE_SHIFT;
+                offset = bo->mem.mm_node->start << PAGE_SHIFT;
+                if ((offset + size) > rdev->mc.visible_vram_size) {
+                        /* hurrah the memory is not visible ! */
+                        radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_VRAM);
+                        rbo->placement.lpfn = rdev->mc.visible_vram_size >> PAGE_SHIFT;
+                        r = ttm_bo_validate(bo, &rbo->placement, false, true, false);
+                        if (unlikely(r != 0))
+                                return r;
+                        offset = bo->mem.mm_node->start << PAGE_SHIFT;
+                        /* this should not happen */
+                        if ((offset + size) > rdev->mc.visible_vram_size)
+                                return -EINVAL;
+                }
+        }
+        return 0;
 }