From 707d561f77b5e2a6f90c9786bee44ee7a8dedc7e Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann <kraxel@redhat.com> Date: Mon, 7 Sep 2020 13:24:25 +0200 Subject: drm: allow limiting the scatter list size. 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 --- drivers/gpu/drm/xen/xen_drm_front_gem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/gpu/drm/xen/xen_drm_front_gem.c') diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c index 39ff95b75357..aed7510e2710 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(gem_obj->dev, + xen_obj->pages, xen_obj->num_pages); } struct drm_gem_object * -- cgit v1.2.3