-----Original Message----- From: Andrey Grodzovsky [mailto:andrey.grodzovsky@xxxxxxx] Sent: Saturday, January 13, 2018 6:29 AM To: dri-devel@xxxxxxxxxxxxxxxxxxxxx; amd-gfx@xxxxxxxxxxxxxxxxxxxxx Cc: Koenig, Christian <Christian.Koenig@xxxxxxx>; He, Roger <Hongbo.He@xxxxxxx>; Grodzovsky, Andrey <Andrey.Grodzovsky@xxxxxxx> Subject: [PATCH 1/2] drm/ttm: Allow page allocations w/o triggering OOM.. This to allow drivers to choose to avoid OOM invocation and handle page allocation failures instead. Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx> --- drivers/gpu/drm/ttm/ttm_bo.c | 3 +++ drivers/gpu/drm/ttm/ttm_page_alloc.c | 6 ++++++ drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 3 +++ drivers/gpu/drm/ttm/ttm_tt.c | 13 +++++++++++-- include/drm/ttm/ttm_bo_api.h | 1 + include/drm/ttm/ttm_bo_driver.h | 4 ++++ 6 files changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index 2eb71ff..f32aab1 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -234,6 +234,9 @@ static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc) if (bdev->need_dma32) page_flags |= TTM_PAGE_FLAG_DMA32; + if (bdev->no_retry) + page_flags |= TTM_PAGE_FLAG_NO_RETRY; + switch (bo->type) { case ttm_bo_type_device: if (zero_alloc) diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c index 0eab24e..f34c843 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c @@ -741,6 +741,9 @@ static int ttm_page_pool_get_pages(struct ttm_page_pool *pool, if (ttm_flags & TTM_PAGE_FLAG_ZERO_ALLOC) gfp_flags |= __GFP_ZERO; + if (ttm_flags & TTM_PAGE_FLAG_NO_RETRY) + gfp_flags |= __GFP_RETRY_MAYFAIL; + /* ttm_alloc_new_pages doesn't reference pool so we can run * multiple requests in parallel. **/ @@ -893,6 +896,9 @@ static int ttm_get_pages(struct page **pages, unsigned npages, int flags, if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) gfp_flags |= __GFP_ZERO; + if (flags & TTM_PAGE_FLAG_NO_RETRY) + gfp_flags |= __GFP_RETRY_MAYFAIL; + if (flags & TTM_PAGE_FLAG_DMA32) gfp_flags |= GFP_DMA32; else diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c index c7f01a4..6949ef7 100644 --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c @@ -920,6 +920,9 @@ static gfp_t ttm_dma_pool_gfp_flags(struct ttm_dma_tt *ttm_dma, bool huge) gfp_flags &= ~__GFP_COMP; } + if (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY) + gfp_flags |= __GFP_RETRY_MAYFAIL; + return gfp_flags; } diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 5a046a3..9e4d43d 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -301,7 +301,11 @@ int ttm_tt_swapin(struct ttm_tt *ttm) swap_space = swap_storage->f_mapping; for (i = 0; i < ttm->num_pages; ++i) { - from_page = shmem_read_mapping_page(swap_space, i); + gfp_t gfp_mask = mapping_gfp_mask(swap_space); + + gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? __GFP_RETRY_MAYFAIL : 0); + from_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask); + if (IS_ERR(from_page)) { ret = PTR_ERR(from_page); goto out_err; @@ -350,10 +354,15 @@ int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage) swap_space = swap_storage->f_mapping; for (i = 0; i < ttm->num_pages; ++i) { + gfp_t gfp_mask = mapping_gfp_mask(swap_space); + + gfp_mask |= (ttm->page_flags & TTM_PAGE_FLAG_NO_RETRY ? +__GFP_RETRY_MAYFAIL : 0); + from_page = ttm->pages[i]; if (unlikely(from_page == NULL)) continue; - to_page = shmem_read_mapping_page(swap_space, i); + + to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_mask); if (IS_ERR(to_page)) { ret = PTR_ERR(to_page); goto out_err; diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h index 2cd025c..099f24b 100644 --- a/include/drm/ttm/ttm_bo_api.h +++ b/include/drm/ttm/ttm_bo_api.h @@ -176,6 +176,7 @@ struct ttm_buffer_object { unsigned long num_pages; size_t acc_size; + Please remove this newline here. Apart from that, this patch is Reviewed-by: Roger He <Hongbo.He@xxxxxxx> Thanks Roger(Hongbo.He) /** * Members not needing protection. */ diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h index 94064b1..9b417eb 100644 --- a/include/drm/ttm/ttm_bo_driver.h +++ b/include/drm/ttm/ttm_bo_driver.h @@ -86,6 +86,7 @@ struct ttm_backend_func { #define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6) #define TTM_PAGE_FLAG_DMA32 (1 << 7) #define TTM_PAGE_FLAG_SG (1 << 8) +#define TTM_PAGE_FLAG_NO_RETRY (1 << 9) enum ttm_caching_state { tt_uncached, @@ -556,6 +557,7 @@ struct ttm_bo_global { * @dev_mapping: A pointer to the struct address_space representing the * device address space. * @wq: Work queue structure for the delayed delete workqueue. + * @no_retry: Don't retry allocation if it fails * */ @@ -592,6 +594,8 @@ struct ttm_bo_device { struct delayed_work wq; bool need_dma32; + + bool no_retry; }; /** -- 2.7.4 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
