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drm/i915: Allocate context objects from stolen

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As we never expose context objects directly to userspace, we can forgo
allocating a first-class GEM object for them and prefer to use the
limited resource of reserved/stolen memory for them. Note this means
that their initial contents are undefined.

However, a downside of using stolen objects for execlists is that we
cannot access the physical address directly (thanks MCH!) which prevents
their use.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2015-04-07 16:21:11 +01:00 committed by Daniel Vetter
parent d7b9ca2f7a
commit 149c86e74f
2 changed files with 4 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_gem_context.c
View File

@ -157,7 +157,9 @@ i915_gem_alloc_context_obj(struct drm_device *dev, size_t size)
struct drm_i915_gem_object *obj;
int ret;
obj = i915_gem_alloc_object(dev, size);
obj = i915_gem_object_create_stolen(dev, size);
if (obj == NULL)
obj = i915_gem_alloc_object(dev, size);
if (obj == NULL)
return ERR_PTR(-ENOMEM);

2
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -1845,7 +1845,7 @@ int intel_lr_context_deferred_create(struct intel_context *ctx,
context_size = round_up(get_lr_context_size(ring), 4096);
ctx_obj = i915_gem_alloc_context_obj(dev, context_size);
ctx_obj = i915_gem_alloc_object(dev, context_size);
if (IS_ERR(ctx_obj)) {
ret = PTR_ERR(ctx_obj);
DRM_DEBUG_DRIVER("Alloc LRC backing obj failed: %d\n", ret);