Commit 9dae9e53 authored Jan 01, 2020 by Chris Wilson

drm/i915/gem: Single page objects are naturally contiguous



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
it.

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>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200101220736.1073007-1-chris@chris-wilson.co.uk

parent c6d4a099

drivers/gpu/drm/i915/gem/i915_gem_region.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -107,7 +107,10 @@ void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj,
		{
		INIT_LIST_HEAD(&obj->mm.blocks);
		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;

		mutex_lock(&mem->objects.lock);

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