Starting from DG2+, when dealing with LMEM, we assume that by default all userspace allocations should be placed in the non-mappable portion of LMEM. Note that dumb buffers are not included here, since these are not "GPU accelerated" and likely need CPU access. In a later patch userspace will be able to provide a hint if CPU access to the buffer is needed. Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/gem/i915_gem_create.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c index 9402d4bf4ffc..e7456443f163 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_create.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c @@ -424,6 +424,15 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, ext_data.n_placements = 1; } + /* + * TODO: add a userspace hint to force CPU_ACCESS for the object, which + * can override this. + */ + if (!IS_DG1(i915) && (ext_data.n_placements > 1 || + ext_data.placements[0]->type != + INTEL_MEMORY_SYSTEM)) + ext_data.flags |= I915_BO_ALLOC_TOPDOWN; + obj = __i915_gem_object_create_user_ext(i915, args->size, ext_data.placements, ext_data.n_placements, -- 2.34.1
