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drm/i915: Declare i915_gem_object_create_internal() as taking phys_addr_t size

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The internal object is a collection of struct pages and so is
intrinsically linked to the available physical memory on the machine,
and not an arbitrary type from the uabi. Use phys_addr_t so the link
between size and memory consumption is clear, and then double check that
we don't overflow the maximum object size.

v2: Also assert that size is not zero - a mistake I made a few times
while writing selftests.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170112130431.1844-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-01-12 13:04:31 +00:00
parent 7c3f86b6dc
commit fcd46e5344
2 changed files with 7 additions and 2 deletions
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2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -3505,7 +3505,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
/* i915_gem_internal.c */
struct drm_i915_gem_object *
i915_gem_object_create_internal(struct drm_i915_private *dev_priv,
unsigned int size);
phys_addr_t size);
/* i915_gem_shrinker.c */
unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,

7
drivers/gpu/drm/i915/i915_gem_internal.c
View File

@ -151,10 +151,15 @@ static const struct drm_i915_gem_object_ops i915_gem_object_internal_ops = {
*/
struct drm_i915_gem_object *
i915_gem_object_create_internal(struct drm_i915_private *i915,
unsigned int size)
phys_addr_t size)
{
struct drm_i915_gem_object *obj;
GEM_BUG_ON(!size);
if (overflows_type(size, obj->base.size))
return ERR_PTR(-E2BIG);
obj = i915_gem_object_alloc(i915);
if (!obj)
return ERR_PTR(-ENOMEM);