From 55e0037aab6503453eef663eded60e530896eaef Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Fri, 15 Dec 2017 16:28:33 -0500 Subject: drm/amdgpu: move dummy page functions to amdgpu_gart.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit It's the only place they are used. Acked-by: Christian König Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 49 ++++++++++++++++++++++++++++++-- 1 file changed, 47 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c') diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c index 1f51897acc5b..0a4f34afaaaa 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c @@ -56,6 +56,51 @@ * Common GART table functions. */ +/** + * amdgpu_dummy_page_init - init dummy page used by the driver + * + * @adev: amdgpu_device pointer + * + * Allocate the dummy page used by the driver (all asics). + * This dummy page is used by the driver as a filler for gart entries + * when pages are taken out of the GART + * Returns 0 on sucess, -ENOMEM on failure. + */ +static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev) +{ + if (adev->dummy_page.page) + return 0; + adev->dummy_page.page = alloc_page(GFP_DMA32 | GFP_KERNEL | __GFP_ZERO); + if (adev->dummy_page.page == NULL) + return -ENOMEM; + adev->dummy_page.addr = pci_map_page(adev->pdev, adev->dummy_page.page, + 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); + if (pci_dma_mapping_error(adev->pdev, adev->dummy_page.addr)) { + dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n"); + __free_page(adev->dummy_page.page); + adev->dummy_page.page = NULL; + return -ENOMEM; + } + return 0; +} + +/** + * amdgpu_dummy_page_fini - free dummy page used by the driver + * + * @adev: amdgpu_device pointer + * + * Frees the dummy page used by the driver (all asics). + */ +static void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev) +{ + if (adev->dummy_page.page == NULL) + return; + pci_unmap_page(adev->pdev, adev->dummy_page.addr, + PAGE_SIZE, PCI_DMA_BIDIRECTIONAL); + __free_page(adev->dummy_page.page); + adev->dummy_page.page = NULL; +} + /** * amdgpu_gart_table_vram_alloc - allocate vram for gart page table * @@ -308,7 +353,7 @@ int amdgpu_gart_init(struct amdgpu_device *adev) DRM_ERROR("Page size is smaller than GPU page size!\n"); return -EINVAL; } - r = amdgpu_dummy_page_init(adev); + r = amdgpu_gart_dummy_page_init(adev); if (r) return r; /* Compute table size */ @@ -340,5 +385,5 @@ void amdgpu_gart_fini(struct amdgpu_device *adev) vfree(adev->gart.pages); adev->gart.pages = NULL; #endif - amdgpu_dummy_page_fini(adev); + amdgpu_gart_dummy_page_fini(adev); } -- cgit v1.2.3