From: Rob Clark Date: Tue, 24 Mar 2026 22:05:17 +0000 (-0700) Subject: drm/msm: Disallow foreign mapping of _NO_SHARE X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c07612365087c8873f3faa2a47642ffa73b12c54;p=thirdparty%2Flinux.git drm/msm: Disallow foreign mapping of _NO_SHARE This restriction applies to mapping of _NO_SHARE objs in the kms vm as well as importing/exporting BOs. Since the DPU has it's own VM, scanout counts as "exporting" a BO from outside of it's host VM. Signed-off-by: Rob Clark Patchwork: https://patchwork.freedesktop.org/patch/713897/ Message-ID: <20260324220519.1221471-1-robin.clark@oss.qualcomm.com> --- diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c index 1c6b0920c0d8..43d61e0919bd 100644 --- a/drivers/gpu/drm/msm/msm_gem_vma.c +++ b/drivers/gpu/drm/msm/msm_gem_vma.c @@ -373,6 +373,12 @@ msm_gem_vma_new(struct drm_gpuvm *gpuvm, struct drm_gem_object *obj, struct msm_gem_vma *vma; int ret; + /* _NO_SHARE objs cannot be mapped outside of their "host" vm: */ + if (obj && (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE) && + GEM_WARN_ON(obj->resv != drm_gpuvm_resv(gpuvm))) { + return ERR_PTR(-EINVAL); + } + drm_gpuvm_resv_assert_held(&vm->base); vma = kzalloc(sizeof(*vma), GFP_KERNEL);