drm/radeon/kms: consolidate GART code, fix segfault after GPU lockup V2

After GPU lockup VRAM gart table is unpinned and thus its pointer
becomes unvalid. This patch move the unpin code to a common helper
function and set pointer to NULL so that page update code can check
if it should update GPU page table or not. That way bo still bound
to GART can be unbound (pci_unmap_page for all there page) properly
while there is no need to update the GPU page table.

V2 move the test for null gart out of the loop, small optimization

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

1 files changed, 3 insertions, 10 deletions

diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index a09049d15901..a983f410ab89 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -124,7 +124,7 @@ int rv770_pcie_gart_enable(struct radeon_device *rdev)
         u32 tmp;
         int r, i;
 
-        if (rdev->gart.table.vram.robj == NULL) {
+        if (rdev->gart.robj == NULL) {
                 dev_err(rdev->dev, "No VRAM object for PCIE GART.\n");
                 return -EINVAL;
         }
@@ -171,7 +171,7 @@ int rv770_pcie_gart_enable(struct radeon_device *rdev)
 void rv770_pcie_gart_disable(struct radeon_device *rdev)
 {
         u32 tmp;
-        int i, r;
+        int i;
 
         /* Disable all tables */
         for (i = 0; i < 7; i++)
@@ -191,14 +191,7 @@ void rv770_pcie_gart_disable(struct radeon_device *rdev)
         WREG32(MC_VM_MB_L1_TLB1_CNTL, tmp);
         WREG32(MC_VM_MB_L1_TLB2_CNTL, tmp);
         WREG32(MC_VM_MB_L1_TLB3_CNTL, tmp);
-        if (rdev->gart.table.vram.robj) {
-                r = radeon_bo_reserve(rdev->gart.table.vram.robj, false);
-                if (likely(r == 0)) {
-                        radeon_bo_kunmap(rdev->gart.table.vram.robj);
-                        radeon_bo_unpin(rdev->gart.table.vram.robj);
-                        radeon_bo_unreserve(rdev->gart.table.vram.robj);
-                }
-        }
+        radeon_gart_table_vram_unpin(rdev);
 }
 
 void rv770_pcie_gart_fini(struct radeon_device *rdev)