Merge branch 'stable/ttm.pci-api.v5' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into drm-next

* 'stable/ttm.pci-api.v5' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  ttm: Include the 'struct dev' when using the DMA API.
  nouveau/ttm/PCIe: Use dma_addr if TTM has set it.
  radeon/ttm/PCIe: Use dma_addr if TTM has set it.
  ttm: Expand (*populate) to support an array of DMA addresses.
  ttm: Utilize the DMA API for pages that have TTM_PAGE_FLAG_DMA32 set.
  ttm: Introduce a placeholder for DMA (bus) addresses.

1 files changed, 26 insertions, 10 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index 65016117d95f..a6b0fed7bae9 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -149,8 +149,9 @@ void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
 	p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
 	for (i = 0; i < pages; i++, p++) {
 		if (rdev->gart.pages[p]) {
-			pci_unmap_page(rdev->pdev, rdev->gart.pages_addr[p],
-				       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+			if (!rdev->gart.ttm_alloced[p])
+				pci_unmap_page(rdev->pdev, rdev->gart.pages_addr[p],
+				       		PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
 			rdev->gart.pages[p] = NULL;
 			rdev->gart.pages_addr[p] = rdev->dummy_page.addr;
 			page_base = rdev->gart.pages_addr[p];
@@ -165,7 +166,7 @@ void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
 }
 
 int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
-		     int pages, struct page **pagelist)
+		     int pages, struct page **pagelist, dma_addr_t *dma_addr)
 {
 	unsigned t;
 	unsigned p;
@@ -180,15 +181,22 @@ int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
 	p = t / (PAGE_SIZE / RADEON_GPU_PAGE_SIZE);
 
 	for (i = 0; i < pages; i++, p++) {
-		/* we need to support large memory configurations */
-		/* assume that unbind have already been call on the range */
-		rdev->gart.pages_addr[p] = pci_map_page(rdev->pdev, pagelist[i],
+		/* On TTM path, we only use the DMA API if TTM_PAGE_FLAG_DMA32
+		 * is requested. */
+		if (dma_addr[i] != DMA_ERROR_CODE) {
+			rdev->gart.ttm_alloced[p] = true;
+			rdev->gart.pages_addr[p] = dma_addr[i];
+		} else {
+			/* we need to support large memory configurations */
+			/* assume that unbind have already been call on the range */
+			rdev->gart.pages_addr[p] = pci_map_page(rdev->pdev, pagelist[i],
 							0, PAGE_SIZE,
 							PCI_DMA_BIDIRECTIONAL);
-		if (pci_dma_mapping_error(rdev->pdev, rdev->gart.pages_addr[p])) {
-			/* FIXME: failed to map page (return -ENOMEM?) */
-			radeon_gart_unbind(rdev, offset, pages);
-			return -ENOMEM;
+			if (pci_dma_mapping_error(rdev->pdev, rdev->gart.pages_addr[p])) {
+				/* FIXME: failed to map page (return -ENOMEM?) */
+				radeon_gart_unbind(rdev, offset, pages);
+				return -ENOMEM;
+			}
 		}
 		rdev->gart.pages[p] = pagelist[i];
 		page_base = rdev->gart.pages_addr[p];
@@ -251,6 +259,12 @@ int radeon_gart_init(struct radeon_device *rdev)
 		radeon_gart_fini(rdev);
 		return -ENOMEM;
 	}
+	rdev->gart.ttm_alloced = kzalloc(sizeof(bool) *
+					 rdev->gart.num_cpu_pages, GFP_KERNEL);
+	if (rdev->gart.ttm_alloced == NULL) {
+		radeon_gart_fini(rdev);
+		return -ENOMEM;
+	}
 	/* set GART entry to point to the dummy page by default */
 	for (i = 0; i < rdev->gart.num_cpu_pages; i++) {
 		rdev->gart.pages_addr[i] = rdev->dummy_page.addr;
@@ -267,6 +281,8 @@ void radeon_gart_fini(struct radeon_device *rdev)
 	rdev->gart.ready = false;
 	kfree(rdev->gart.pages);
 	kfree(rdev->gart.pages_addr);
+	kfree(rdev->gart.ttm_alloced);
 	rdev->gart.pages = NULL;
 	rdev->gart.pages_addr = NULL;
+	rdev->gart.ttm_alloced = NULL;
 }