Keep the behaviour consistent with normal lmem, where we assume CPU
access if by default required.
Signed-off-by: Matthew Auld <matthew.a...@intel.com>
Cc: Thomas Hellström <thomas.hellst...@linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index 6df1600708a7..369a2a60bd7a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -695,6 +695,14 @@ static int _i915_gem_object_stolen_init(struct
intel_memory_region *mem,
if (size == 0)
return -EINVAL;
+ /*
+ * With discrete devices, where we lack a mappable aperture there is no
+ * possible way to ever access this memory on the CPU side.
+ */
+ if (mem->type == INTEL_MEMORY_STOLEN_LOCAL && !mem->io_size &&
+ !(flags & I915_BO_ALLOC_GPU_ONLY))
+ return -ENOSPC;
+
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
if (!stolen)
return -ENOMEM;
--
2.34.1
