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/radeon/radeon.h | 4 ++- drivers/gpu/drm/radeon/radeon_gart.c | 36 ++++++++++++++++++++++++--------- drivers/gpu/drm/radeon/radeon_ttm.c | 5 +++- 3 files changed, 33 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 73f600d..c9bbab9 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -317,6 +317,7 @@ struct radeon_gart { union radeon_gart_table table; struct page **pages; dma_addr_t *pages_addr; + bool *ttm_alloced; bool ready; };
@@ -329,7 +330,8 @@ void radeon_gart_fini(struct radeon_device *rdev); void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset, int pages); 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);
/* diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c index e65b903..4a5ac4b 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; } diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index 6f156e9..ca04505 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -647,6 +647,7 @@ struct radeon_ttm_backend { unsigned long num_pages; struct page **pages; struct page *dummy_read_page; + dma_addr_t *dma_addrs; bool populated; bool bound; unsigned offset; @@ -662,6 +663,7 @@ static int radeon_ttm_backend_populate(struct ttm_backend *backend,
gtt = container_of(backend, struct radeon_ttm_backend, backend); gtt->pages = pages; + gtt->dma_addrs = dma_addrs; gtt->num_pages = num_pages; gtt->dummy_read_page = dummy_read_page; gtt->populated = true; @@ -674,6 +676,7 @@ static void radeon_ttm_backend_clear(struct ttm_backend *backend)
gtt = container_of(backend, struct radeon_ttm_backend, backend); gtt->pages = NULL; + gtt->dma_addrs = NULL; gtt->num_pages = 0; gtt->dummy_read_page = NULL; gtt->populated = false; @@ -694,7 +697,7 @@ static int radeon_ttm_backend_bind(struct ttm_backend *backend, gtt->num_pages, bo_mem, backend); } r = radeon_gart_bind(gtt->rdev, gtt->offset, - gtt->num_pages, gtt->pages); + gtt->num_pages, gtt->pages, gtt->dma_addrs); if (r) { DRM_ERROR("failed to bind %lu pages at 0x%08X\n", gtt->num_pages, gtt->offset);