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SubjectRe: [PATCH 4/5] radeon/ttm/PCIe: Use dma_addr if TTM has set it.
On Fri, Jan 07, 2011 at 12:11:43PM -0500, Konrad Rzeszutek Wilk wrote:
> 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.

Hey Jerome,

I should have CC-ed you earlier but missed that and instead just
CC-ed the mailing list. I was wondering what your thoughts are
about this patchset? Thomas took a look at the patchset and he is OK
but more eyes never hurt.

FYI, for clarity I hadn't made the old calls that got moved due
to adding of "{" checkpatch.pl compliant. It complains about it being
past 80 characters. I can naturally fix that up, but thought
that it might detract from the nature of the patch.


>
> 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);
> --
> 1.7.1


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