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, 23 insertions, 8 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
index 9a250eb53098..07b115184b87 100644
--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -12,6 +12,7 @@ struct nouveau_sgdma_be {
         struct drm_device *dev;
 
         dma_addr_t *pages;
+        bool *ttm_alloced;
         unsigned nr_pages;
 
         u64 offset;
@@ -20,7 +21,8 @@ struct nouveau_sgdma_be {
 
 static int
 nouveau_sgdma_populate(struct ttm_backend *be, unsigned long num_pages,
-                       struct page **pages, struct page *dummy_read_page)
+                       struct page **pages, struct page *dummy_read_page,
+                       dma_addr_t *dma_addrs)
 {
         struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)be;
         struct drm_device *dev = nvbe->dev;
@@ -34,15 +36,25 @@ nouveau_sgdma_populate(struct ttm_backend *be, unsigned long num_pages,
         if (!nvbe->pages)
                 return -ENOMEM;
 
+        nvbe->ttm_alloced = kmalloc(sizeof(bool) * num_pages, GFP_KERNEL);
+        if (!nvbe->ttm_alloced)
+                return -ENOMEM;
+
         nvbe->nr_pages = 0;
         while (num_pages--) {
-                nvbe->pages[nvbe->nr_pages] =
-                        pci_map_page(dev->pdev, pages[nvbe->nr_pages], 0,
+                if (dma_addrs[nvbe->nr_pages] != DMA_ERROR_CODE) {
+                        nvbe->pages[nvbe->nr_pages] =
+                                        dma_addrs[nvbe->nr_pages];
+                        nvbe->ttm_alloced[nvbe->nr_pages] = true;
+                } else {
+                        nvbe->pages[nvbe->nr_pages] =
+                                pci_map_page(dev->pdev, pages[nvbe->nr_pages], 0,
                                      PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
-                if (pci_dma_mapping_error(dev->pdev,
-                                          nvbe->pages[nvbe->nr_pages])) {
-                        be->func->clear(be);
-                        return -EFAULT;
+                        if (pci_dma_mapping_error(dev->pdev,
+                                                  nvbe->pages[nvbe->nr_pages])) {
+                                be->func->clear(be);
+                                return -EFAULT;
+                        }
                 }
 
                 nvbe->nr_pages++;
@@ -65,11 +77,14 @@ nouveau_sgdma_clear(struct ttm_backend *be)
                         be->func->unbind(be);
 
                 while (nvbe->nr_pages--) {
-                        pci_unmap_page(dev->pdev, nvbe->pages[nvbe->nr_pages],
+                        if (!nvbe->ttm_alloced[nvbe->nr_pages])
+                                pci_unmap_page(dev->pdev, nvbe->pages[nvbe->nr_pages],
                                        PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
                 }
                 kfree(nvbe->pages);
+                kfree(nvbe->ttm_alloced);
                 nvbe->pages = NULL;
+                nvbe->ttm_alloced = NULL;
                 nvbe->nr_pages = 0;
         }
 }