Am 16.01.2018 um 07:02 schrieb He, Roger: > > -----Original Message----- > From: Andrey Grodzovsky [mailto:andrey.grodzovsky at amd.com] > Sent: Saturday, January 13, 2018 6:29 AM > To: dri-devel at lists.freedesktop.org; amd-gfx at lists.freedesktop.org > Cc: Koenig, Christian <Christian.Koenig at amd.com>; He, Roger <Hongbo.He at amd.com>; Grodzovsky, Andrey <Andrey.Grodzovsky at amd.com> > 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 at amd.com> > --- > 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 at amd.com> Jup agree, apart from the nit pick the patch is Reviewed-by: Christian König <christian.koenig at amd.com> as well. Christian. > > 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 > > _______________________________________________ > amd-gfx mailing list > amd-gfx at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
