[CI,1/3] drm/i915/gem: Single page objects are naturally contiguous
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Message ID 20200101163918.768253-1-chris@chris-wilson.co.uk
State New
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  • [CI,1/3] drm/i915/gem: Single page objects are naturally contiguous
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Commit Message

Chris Wilson Jan. 1, 2020, 4:39 p.m. UTC
Small objects that only occupy a single page are naturally contiguous,
so mark them as such and allow them the special abilities that come with

A more thorough treatment would extend i915_gem_object_pin_map() to
support discontiguous lmem objects, following the example of
ioremap_prot() and use get_vm_area() + remap_io_sg().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
 drivers/gpu/drm/i915/gem/i915_gem_region.c | 3 +++
 1 file changed, 3 insertions(+)

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diff --git a/drivers/gpu/drm/i915/gem/i915_gem_region.c b/drivers/gpu/drm/i915/gem/i915_gem_region.c
index d50adac12249..1515384d7e0e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_region.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_region.c
@@ -107,7 +107,10 @@  void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj,
 	obj->mm.region = intel_memory_region_get(mem);
 	obj->flags |= flags;
+	if (obj->base.size <= mem->min_page_size)
+		obj->flags |= I915_BO_ALLOC_CONTIGUOUS;