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drm: allow limiting the scatter list size.

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Add drm_device argument to drm_prime_pages_to_sg(), so we can
call dma_max_mapping_size() to figure the segment size limit
and call into __sg_alloc_table_from_pages() with the correct
limit.

This fixes virtio-gpu with sev.  Possibly it'll fix other bugs
too given that drm seems to totaly ignore segment size limits
so far ...

v2: place max_segment in drm driver not gem object.
v3: move max_segment next to the other gem fields.
v4: just use dma_max_mapping_size().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20200907112425.15610-2-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2020-09-07 13:24:25 +02:00
parent 04e89ff364
commit 707d561f77
14 changed files with 29 additions and 17 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
View File

@ -302,7 +302,8 @@ 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,
sgt = drm_prime_pages_to_sg(obj->dev,
bo->tbo.ttm->pages,
bo->tbo.num_pages);
if (IS_ERR(sgt))
return sgt;

2
drivers/gpu/drm/drm_gem_shmem_helper.c
View File

@ -656,7 +656,7 @@ 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(obj->dev, shmem->pages, obj->size >> PAGE_SHIFT);
}
EXPORT_SYMBOL_GPL(drm_gem_shmem_get_sg_table);

13
drivers/gpu/drm/drm_prime.c
View File

@ -802,9 +802,11 @@ 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 drm_device *dev,
struct page **pages, unsigned int nr_pages)
{
struct sg_table *sg = NULL;
size_t max_segment = 0;
int ret;
sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
@ -813,8 +815,13 @@ 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 (dev)
max_segment = dma_max_mapping_size(dev->dev);
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;

3
drivers/gpu/drm/etnaviv/etnaviv_gem.c
View File

@ -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->base.dev,
etnaviv_obj->pages, npages);
if (IS_ERR(sgt)) {
dev_err(dev->dev, "failed to allocate sgt: %ld\n",
PTR_ERR(sgt));

2
drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
View File

@ -19,7 +19,7 @@ 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(obj->dev, etnaviv_obj->pages, npages);
}
void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj)

2
drivers/gpu/drm/msm/msm_gem.c
View File

@ -126,7 +126,7 @@ 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(obj->dev, p, npages);
if (IS_ERR(msm_obj->sgt)) {
void *ptr = ERR_CAST(msm_obj->sgt);

2
drivers/gpu/drm/msm/msm_gem_prime.c
View File

@ -19,7 +19,7 @@ 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(obj->dev, msm_obj->pages, npages);
}
void *msm_gem_prime_vmap(struct drm_gem_object *obj)

2
drivers/gpu/drm/nouveau/nouveau_prime.c
View File

@ -32,7 +32,7 @@ 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(obj->dev, nvbo->bo.ttm->pages, npages);
}
void *nouveau_gem_prime_vmap(struct drm_gem_object *obj)

2
drivers/gpu/drm/radeon/radeon_prime.c
View File

@ -36,7 +36,7 @@ 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(obj->dev, bo->tbo.ttm->pages, npages);
}
void *radeon_gem_prime_vmap(struct drm_gem_object *obj)

5
drivers/gpu/drm/rockchip/rockchip_drm_gem.c
View File

@ -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->base.dev,
rk_obj->pages, rk_obj->num_pages);
if (IS_ERR(rk_obj->sgt)) {
ret = PTR_ERR(rk_obj->sgt);
goto err_put_pages;
@ -442,7 +443,7 @@ 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(obj->dev, rk_obj->pages, rk_obj->num_pages);
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt)

2
drivers/gpu/drm/tegra/gem.c
View File

@ -284,7 +284,7 @@ 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->gem.dev, bo->pages, bo->num_pages);
if (IS_ERR(bo->sgt)) {
err = PTR_ERR(bo->sgt);
goto put_pages;

2
drivers/gpu/drm/vgem/vgem_drv.c
View File

@ -321,7 +321,7 @@ 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(obj->dev, bo->pages, bo->base.size >> PAGE_SHIFT);
}
static struct drm_gem_object* vgem_prime_import(struct drm_device *dev,

3
drivers/gpu/drm/xen/xen_drm_front_gem.c
View File

@ -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(gem_obj->dev,
xen_obj->pages, xen_obj->num_pages);
}
struct drm_gem_object *

3
include/drm/drm_prime.h
View File

@ -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 drm_device *dev,
struct page **pages, unsigned int nr_pages);
struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj,
int flags);