Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <robin.clark@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/713897/
Message-ID: <20260324220519.1221471-1-robin.clark@oss.qualcomm.com>
+6
+6
drivers/gpu/drm/msm/msm_gem_vma.c
+6
drivers/gpu/drm/msm/msm_gem_vma.c
···
373
373
struct msm_gem_vma *vma;
374
374
int ret;
375
375
376
+
/* _NO_SHARE objs cannot be mapped outside of their "host" vm: */
377
+
if (obj && (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE) &&
378
+
GEM_WARN_ON(obj->resv != drm_gpuvm_resv(gpuvm))) {
379
+
return ERR_PTR(-EINVAL);
380
+
}
381
+
376
382
drm_gpuvm_resv_assert_held(&vm->base);
377
383
378
384
vma = kzalloc(sizeof(*vma), GFP_KERNEL);