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Message-ID: <9c355d64-1a61-eb59-be80-d9fc863ddf22@amd.com>
Date: Tue, 18 Aug 2020 09:57:59 +0200
From: Christian König <christian.koenig@....com>
To: Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc: Alex Deucher <alexander.deucher@....com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Lucas Stach <l.stach@...gutronix.de>,
Russell King <linux+etnaviv@...linux.org.uk>,
Christian Gmeiner <christian.gmeiner@...il.com>,
Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
Ben Skeggs <bskeggs@...hat.com>,
Sandy Huang <hjc@...k-chips.com>,
Heiko Stübner <heiko@...ech.de>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>,
"open list:RADEON and AMDGPU DRM DRIVERS"
<amd-gfx@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>,
"moderated list:DRM DRIVERS FOR VIVANTE GPU IP"
<etnaviv@...ts.freedesktop.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<freedreno@...ts.freedesktop.org>,
"open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS"
<nouveau@...ts.freedesktop.org>,
"moderated list:ARM/Rockchip SoC support"
<linux-arm-kernel@...ts.infradead.org>,
"open list:ARM/Rockchip SoC support"
<linux-rockchip@...ts.infradead.org>,
"open list:DRM DRIVERS FOR NVIDIA TEGRA"
<linux-tegra@...r.kernel.org>,
"moderated list:DRM DRIVERS FOR XEN" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 1/2] drm: allow limiting the scatter list size.
Am 18.08.20 um 09:48 schrieb Gerd Hoffmann:
> Add max_segment argument to drm_prime_pages_to_sg(). When set pass it
> through to the __sg_alloc_table_from_pages() call, otherwise use
> SCATTERLIST_MAX_SEGMENT.
>
> Also add max_segment field to gem objects and pass it to
> drm_prime_pages_to_sg() calls in drivers and helpers.
>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
I'm missing an explanation why this should be useful (it certainly is).
And the maximum segment size seems misplaced in the GEM object. This is
usually a property of the device or even completely constant.
Christian.
> ---
> include/drm/drm_gem.h | 8 ++++++++
> include/drm/drm_prime.h | 3 ++-
> drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 3 ++-
> drivers/gpu/drm/drm_gem_shmem_helper.c | 3 ++-
> drivers/gpu/drm/drm_prime.c | 10 +++++++---
> drivers/gpu/drm/etnaviv/etnaviv_gem.c | 3 ++-
> drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 3 ++-
> drivers/gpu/drm/msm/msm_gem.c | 3 ++-
> drivers/gpu/drm/msm/msm_gem_prime.c | 3 ++-
> drivers/gpu/drm/nouveau/nouveau_prime.c | 3 ++-
> drivers/gpu/drm/radeon/radeon_prime.c | 3 ++-
> drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 6 ++++--
> drivers/gpu/drm/tegra/gem.c | 3 ++-
> drivers/gpu/drm/vgem/vgem_drv.c | 3 ++-
> drivers/gpu/drm/xen/xen_drm_front_gem.c | 3 ++-
> 15 files changed, 43 insertions(+), 17 deletions(-)
>
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 337a48321705..dea5e92e745b 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -241,6 +241,14 @@ struct drm_gem_object {
> */
> size_t size;
>
> + /**
> + * @max_segment:
> + *
> + * Max size for scatter list segments. When unset the default
> + * (SCATTERLIST_MAX_SEGMENT) is used.
> + */
> + size_t max_segment;
> +
> /**
> * @name:
> *
> diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h
> index 9af7422b44cf..2c3689435cb4 100644
> --- a/include/drm/drm_prime.h
> +++ b/include/drm/drm_prime.h
> @@ -88,7 +88,8 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr);
> int drm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
> int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma);
>
> -struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages);
> +struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages,
> + size_t max_segment);
> struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj,
> int flags);
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> index 519ce4427fce..5e8a9760b33f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
> @@ -303,7 +303,8 @@ static struct sg_table *amdgpu_dma_buf_map(struct dma_buf_attachment *attach,
> switch (bo->tbo.mem.mem_type) {
> case TTM_PL_TT:
> sgt = drm_prime_pages_to_sg(bo->tbo.ttm->pages,
> - bo->tbo.num_pages);
> + bo->tbo.num_pages,
> + obj->max_segment);
> if (IS_ERR(sgt))
> return sgt;
>
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 4b7cfbac4daa..cfb979d808fd 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -656,7 +656,8 @@ struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj)
>
> WARN_ON(shmem->base.import_attach);
>
> - return drm_prime_pages_to_sg(shmem->pages, obj->size >> PAGE_SHIFT);
> + return drm_prime_pages_to_sg(shmem->pages, obj->size >> PAGE_SHIFT,
> + obj->max_segment);
> }
> EXPORT_SYMBOL_GPL(drm_gem_shmem_get_sg_table);
>
> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
> index 1693aa7c14b5..27c783fd6633 100644
> --- a/drivers/gpu/drm/drm_prime.c
> +++ b/drivers/gpu/drm/drm_prime.c
> @@ -802,7 +802,8 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = {
> *
> * This is useful for implementing &drm_gem_object_funcs.get_sg_table.
> */
> -struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages)
> +struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages,
> + size_t max_segment)
> {
> struct sg_table *sg = NULL;
> int ret;
> @@ -813,8 +814,11 @@ struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_page
> goto out;
> }
>
> - ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
> - nr_pages << PAGE_SHIFT, GFP_KERNEL);
> + if (max_segment == 0 || max_segment > SCATTERLIST_MAX_SEGMENT)
> + max_segment = SCATTERLIST_MAX_SEGMENT;
> + ret = __sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
> + nr_pages << PAGE_SHIFT,
> + max_segment, GFP_KERNEL);
> if (ret)
> goto out;
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> index f06e19e7be04..e5b6e7996f80 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> @@ -103,7 +103,8 @@ struct page **etnaviv_gem_get_pages(struct etnaviv_gem_object *etnaviv_obj)
> int npages = etnaviv_obj->base.size >> PAGE_SHIFT;
> struct sg_table *sgt;
>
> - sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
> + sgt = drm_prime_pages_to_sg(etnaviv_obj->pages, npages,
> + etnaviv_obj->base.max_segment);
> if (IS_ERR(sgt)) {
> dev_err(dev->dev, "failed to allocate sgt: %ld\n",
> PTR_ERR(sgt));
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
> index 6d9e5c3c4dd5..f327676450bd 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
> @@ -19,7 +19,8 @@ struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
> if (WARN_ON(!etnaviv_obj->pages)) /* should have already pinned! */
> return ERR_PTR(-EINVAL);
>
> - return drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
> + return drm_prime_pages_to_sg(etnaviv_obj->pages, npages,
> + obj->max_segment);
> }
>
> void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj)
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index b2f49152b4d4..f805419bb84a 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -126,7 +126,8 @@ static struct page **get_pages(struct drm_gem_object *obj)
>
> msm_obj->pages = p;
>
> - msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
> + msm_obj->sgt = drm_prime_pages_to_sg(p, npages,
> + obj->max_segment);
> if (IS_ERR(msm_obj->sgt)) {
> void *ptr = ERR_CAST(msm_obj->sgt);
>
> diff --git a/drivers/gpu/drm/msm/msm_gem_prime.c b/drivers/gpu/drm/msm/msm_gem_prime.c
> index d7c8948427fe..a5a412564c7f 100644
> --- a/drivers/gpu/drm/msm/msm_gem_prime.c
> +++ b/drivers/gpu/drm/msm/msm_gem_prime.c
> @@ -19,7 +19,8 @@ struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj)
> if (WARN_ON(!msm_obj->pages)) /* should have already pinned! */
> return NULL;
>
> - return drm_prime_pages_to_sg(msm_obj->pages, npages);
> + return drm_prime_pages_to_sg(msm_obj->pages, npages,
> + obj->max_segment);
> }
>
> void *msm_gem_prime_vmap(struct drm_gem_object *obj)
> diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
> index bae6a3eccee0..56a2e916d51a 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_prime.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
> @@ -32,7 +32,8 @@ struct sg_table *nouveau_gem_prime_get_sg_table(struct drm_gem_object *obj)
> struct nouveau_bo *nvbo = nouveau_gem_object(obj);
> int npages = nvbo->bo.num_pages;
>
> - return drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages);
> + return drm_prime_pages_to_sg(nvbo->bo.ttm->pages, npages,
> + obj->max_segment);
> }
>
> void *nouveau_gem_prime_vmap(struct drm_gem_object *obj)
> diff --git a/drivers/gpu/drm/radeon/radeon_prime.c b/drivers/gpu/drm/radeon/radeon_prime.c
> index b906e8fbd5f3..503e35625045 100644
> --- a/drivers/gpu/drm/radeon/radeon_prime.c
> +++ b/drivers/gpu/drm/radeon/radeon_prime.c
> @@ -36,7 +36,8 @@ struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
> struct radeon_bo *bo = gem_to_radeon_bo(obj);
> int npages = bo->tbo.num_pages;
>
> - return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
> + return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages,
> + obj->max_segment);
> }
>
> void *radeon_gem_prime_vmap(struct drm_gem_object *obj)
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> index b9275ba7c5a5..444657e03c16 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> @@ -85,7 +85,8 @@ static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
>
> rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
>
> - rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
> + rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages,
> + rk_obj->base.max_segment);
> if (IS_ERR(rk_obj->sgt)) {
> ret = PTR_ERR(rk_obj->sgt);
> goto err_put_pages;
> @@ -442,7 +443,8 @@ struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
> int ret;
>
> if (rk_obj->pages)
> - return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages);
> + return drm_prime_pages_to_sg(rk_obj->pages, rk_obj->num_pages,
> + obj->max_segment);
>
> sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
> if (!sgt)
> diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
> index 723df142a981..8d98b02a8d21 100644
> --- a/drivers/gpu/drm/tegra/gem.c
> +++ b/drivers/gpu/drm/tegra/gem.c
> @@ -284,7 +284,8 @@ static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
>
> bo->num_pages = bo->gem.size >> PAGE_SHIFT;
>
> - bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
> + bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages,
> + bo->gem.max_segment);
> if (IS_ERR(bo->sgt)) {
> err = PTR_ERR(bo->sgt);
> goto put_pages;
> diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
> index 313339bbff90..d25c93b5a2c1 100644
> --- a/drivers/gpu/drm/vgem/vgem_drv.c
> +++ b/drivers/gpu/drm/vgem/vgem_drv.c
> @@ -321,7 +321,8 @@ static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj)
> {
> struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
>
> - return drm_prime_pages_to_sg(bo->pages, bo->base.size >> PAGE_SHIFT);
> + return drm_prime_pages_to_sg(bo->pages, bo->base.size >> PAGE_SHIFT,
> + obj->max_segment);
> }
>
> static struct drm_gem_object* vgem_prime_import(struct drm_device *dev,
> diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
> index f0b85e094111..362fe5311b1b 100644
> --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
> +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
> @@ -179,7 +179,8 @@ struct sg_table *xen_drm_front_gem_get_sg_table(struct drm_gem_object *gem_obj)
> if (!xen_obj->pages)
> return ERR_PTR(-ENOMEM);
>
> - return drm_prime_pages_to_sg(xen_obj->pages, xen_obj->num_pages);
> + return drm_prime_pages_to_sg(xen_obj->pages, xen_obj->num_pages,
> + gem_obj->max_segment);
> }
>
> struct drm_gem_object *
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