drm/nv50-: map TTM_PL_SYSTEM through a BAR for CPU access

Moves bo's to TTM_PL_TT for BAR mapping, to hide tiling from user.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index e4623e9..39ca36c 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1241,6 +1241,7 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 {
        struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
        struct nouveau_drm *drm = nouveau_bdev(bdev);
+       struct nouveau_mem *node = mem->mm_node;
        struct drm_device *dev = drm->dev;
        int ret;
 
@@ -1263,14 +1264,16 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
                        mem->bus.is_iomem = !dev->agp->cant_use_aperture;
                }
 #endif
-               break;
+               if (!node->memtype)
+                       /* untiled */
+                       break;
+               /* fallthrough, tiled memory */
        case TTM_PL_VRAM:
                mem->bus.offset = mem->start << PAGE_SHIFT;
                mem->bus.base = pci_resource_start(dev->pdev, 1);
                mem->bus.is_iomem = true;
                if (nv_device(drm->device)->card_type >= NV_50) {
                        struct nouveau_bar *bar = nouveau_bar(drm->device);
-                       struct nouveau_mem *node = mem->mm_node;
 
                        ret = bar->umap(bar, node, NV_MEM_ACCESS_RW,
                                        &node->bar_vma);
@@ -1306,6 +1309,7 @@ nouveau_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
        struct nouveau_bo *nvbo = nouveau_bo(bo);
        struct nouveau_device *device = nv_device(drm->device);
        u32 mappable = pci_resource_len(device->pdev, 1) >> PAGE_SHIFT;
+       int ret;
 
        /* as long as the bo isn't in vram, and isn't tiled, we've got
         * nothing to do here.
@@ -1314,10 +1318,20 @@ nouveau_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
                if (nv_device(drm->device)->card_type < NV_50 ||
                    !nouveau_bo_tile_layout(nvbo))
                        return 0;
+
+               if (bo->mem.mem_type == TTM_PL_SYSTEM) {
+                       nouveau_bo_placement_set(nvbo, TTM_PL_TT, 0);
+
+                       ret = nouveau_bo_validate(nvbo, false, false);
+                       if (ret)
+                               return ret;
+               }
+               return 0;
        }
 
        /* make sure bo is in mappable vram */
-       if (bo->mem.start + bo->mem.num_pages < mappable)
+       if (nv_device(drm->device)->card_type >= NV_50 ||
+           bo->mem.start + bo->mem.num_pages < mappable)
                return 0;