support for platform devices

Upcoming mobile Kepler GPUs (such as GK20A) use the platform bus instead
of PCI to which Nouveau is tightly dependent. This patch allows Nouveau
to handle platform devices by:

- abstracting PCI-dependent functions that were typically used for
  resource querying and page mapping,
- introducing a nv_device_is_pci() function that allows to make
  PCI-dependent code conditional,
- providing a nouveau_drm_platform_probe() function that takes a GPU
  platform device to be probed.

Core code as well as engine/subdev drivers are updated wherever possible
to make use of these functions. Some older drivers are too dependent on
PCI to be properly updated, but all newer code on which future chips may
depend should at least be runnable with platform devices.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 4aed1714b9ab..b6dc85c614be 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1255,7 +1255,7 @@ nouveau_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
 		/* 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.base = nv_device_resource_start(nouveau_dev(dev), 1);
 		mem->bus.is_iomem = true;
 		if (nv_device(drm->device)->card_type >= NV_50) {
 			struct nouveau_bar *bar = nouveau_bar(drm->device);
@@ -1293,7 +1293,7 @@ nouveau_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
 	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
 	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;
+	u32 mappable = nv_device_resource_len(device, 1) >> PAGE_SHIFT;
 	int ret;
 
 	/* as long as the bo isn't in vram, and isn't tiled, we've got
@@ -1331,6 +1331,7 @@ nouveau_ttm_tt_populate(struct ttm_tt *ttm)
 {
 	struct ttm_dma_tt *ttm_dma = (void *)ttm;
 	struct nouveau_drm *drm;
+	struct nouveau_device *device;
 	struct drm_device *dev;
 	unsigned i;
 	int r;
@@ -1348,6 +1349,7 @@ nouveau_ttm_tt_populate(struct ttm_tt *ttm)
 	}
 
 	drm = nouveau_bdev(ttm->bdev);
+	device = nv_device(drm->device);
 	dev = drm->dev;
 
 #if __OS_HAS_AGP
@@ -1368,13 +1370,12 @@ nouveau_ttm_tt_populate(struct ttm_tt *ttm)
 	}
 
 	for (i = 0; i < ttm->num_pages; i++) {
-		ttm_dma->dma_address[i] = pci_map_page(dev->pdev, ttm->pages[i],
-						   0, PAGE_SIZE,
-						   PCI_DMA_BIDIRECTIONAL);
-		if (pci_dma_mapping_error(dev->pdev, ttm_dma->dma_address[i])) {
+		ttm_dma->dma_address[i] = nv_device_map_page(device,
+							     ttm->pages[i]);
+		if (!ttm_dma->dma_address[i]) {
 			while (--i) {
-				pci_unmap_page(dev->pdev, ttm_dma->dma_address[i],
-					       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+				nv_device_unmap_page(device,
+						     ttm_dma->dma_address[i]);
 				ttm_dma->dma_address[i] = 0;
 			}
 			ttm_pool_unpopulate(ttm);
@@ -1389,6 +1390,7 @@ nouveau_ttm_tt_unpopulate(struct ttm_tt *ttm)
 {
 	struct ttm_dma_tt *ttm_dma = (void *)ttm;
 	struct nouveau_drm *drm;
+	struct nouveau_device *device;
 	struct drm_device *dev;
 	unsigned i;
 	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
@@ -1397,6 +1399,7 @@ nouveau_ttm_tt_unpopulate(struct ttm_tt *ttm)
 		return;
 
 	drm = nouveau_bdev(ttm->bdev);
+	device = nv_device(drm->device);
 	dev = drm->dev;
 
 #if __OS_HAS_AGP
@@ -1415,8 +1418,7 @@ nouveau_ttm_tt_unpopulate(struct ttm_tt *ttm)
 
 	for (i = 0; i < ttm->num_pages; i++) {
 		if (ttm_dma->dma_address[i]) {
-			pci_unmap_page(dev->pdev, ttm_dma->dma_address[i],
-				       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+			nv_device_unmap_page(device, ttm_dma->dma_address[i]);
 		}
 	}