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[PATCH v2 1/2] drm: allow limiting the scatter list size.



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 drm driver and pass it to
drm_prime_pages_to_sg() calls in drivers and helpers.

v2: place max_segment in drm driver not gem object.

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
 include/drm/drm_device.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_device.h b/include/drm/drm_device.h
index 0988351d743c..47cb547a8115 100644
--- a/include/drm/drm_device.h
+++ b/include/drm/drm_device.h
@@ -329,6 +329,14 @@ struct drm_device {
         */
        struct drm_fb_helper *fb_helper;
 
+       /**
+        * @max_segment:
+        *
+        * Max size for scatter list segments.  When unset the default
+        * (SCATTERLIST_MAX_SEGMENT) is used.
+        */
+       size_t max_segment;
+
        /* Everything below here is for legacy driver, never use! */
        /* private: */
 #if IS_ENABLED(CONFIG_DRM_LEGACY)
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..8f6a647757e7 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->dev->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..8f47b41b0b2f 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->dev->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..90654246b335 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.dev->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..f65be0fffb3d 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->dev->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..dbf1437c3dac 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->dev->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..6337cd1f9428 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->dev->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..dd0ff032ae16 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->dev->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..61a3fe147489 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->dev->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..5ddb2d31a607 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.dev->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->dev->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..a0abde747e95 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.dev->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..045461dc6319 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->dev->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..61a8c1a9fb04 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->dev->max_segment);
 }
 
 struct drm_gem_object *
-- 
2.18.4




 


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