If the TTM layer has used the DMA API to setup pages that are TTM_PAGE_FLAG_DMA32 (look at patch titled: "ttm: Utilize the dma_addr_t array for pages that are to in DMA32 pool."), lets use it when programming the GART in the PCIe type cards.
This patch skips doing the pci_map_page (and pci_unmap_page) if there is a DMA addresses passed in for that page. If the dma_address is zero (or DMA_ERROR_CODE), then we continue on with our old behaviour.
Signed-off-by: Konrad Rzeszutek Wilk konrad.wilk@oracle.com --- drivers/gpu/drm/nouveau/nouveau_sgdma.c | 28 +++++++++++++++++++++------- 1 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c index edc140a..bbdd982 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;
unsigned pte_start; @@ -35,15 +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++; @@ -66,11 +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; } }