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drm/i915/bdw: Don't execute context reset and switch with Execlists

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These two functions make no sense in an Logical Ring Context & Execlists
world.

v2: We got rid of lrc_enabled and centralized everything in the sanitized
i915.enable_execlists instead.

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>

v3: Rebased.  Corrected a typo in comment for i915_switch_context and
added a comment that it should not be called in execlist mode. Added
WARN_ON if i915_switch_context is called in execlist mode. Moved check
for execlist mode out of i915_switch_context and into callers. Added
comment in context_reset explaining why nothing is done in execlist
mode.

Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
[danvet: Simplify the patch subject so I can understand it.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Thomas Daniel 2014-08-20 16:29:24 +01:00 committed by Daniel Vetter
parent 9a2d2d8708
commit ecdb5fd861
2 changed files with 20 additions and 4 deletions
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8
drivers/gpu/drm/i915/i915_gem.c
View File

@ -2985,9 +2985,11 @@ int i915_gpu_idle(struct drm_device *dev)
/* Flush everything onto the inactive list. */
for_each_ring(ring, dev_priv, i) {
ret = i915_switch_context(ring, ring->default_context);
if (ret)
return ret;
if (!i915.enable_execlists) {
ret = i915_switch_context(ring, ring->default_context);
if (ret)
return ret;
}
ret = intel_ring_idle(ring);
if (ret)

16
drivers/gpu/drm/i915/i915_gem_context.c
View File

@ -289,6 +289,12 @@ void i915_gem_context_reset(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
/* In execlists mode we will unreference the context when the execlist
* queue is cleared and the requests destroyed.
*/
if (i915.enable_execlists)
return;
for (i = 0; i < I915_NUM_RINGS; i++) {
struct intel_engine_cs *ring = &dev_priv->ring[i];
struct intel_context *lctx = ring->last_context;
@ -397,6 +403,9 @@ int i915_gem_context_enable(struct drm_i915_private *dev_priv)
BUG_ON(!dev_priv->ring[RCS].default_context);
if (i915.enable_execlists)
return 0;
for_each_ring(ring, dev_priv, i) {
ret = i915_switch_context(ring, ring->default_context);
if (ret)
@ -639,14 +648,19 @@ unpin_out:
*
* The context life cycle is simple. The context refcount is incremented and
* decremented by 1 and create and destroy. If the context is in use by the GPU,
* it will have a refoucnt > 1. This allows us to destroy the context abstract
* it will have a refcount > 1. This allows us to destroy the context abstract
* object while letting the normal object tracking destroy the backing BO.
*
* This function should not be used in execlists mode. Instead the context is
* switched by writing to the ELSP and requests keep a reference to their
* context.
*/
int i915_switch_context(struct intel_engine_cs *ring,
struct intel_context *to)
{
struct drm_i915_private *dev_priv = ring->dev->dev_private;
WARN_ON(i915.enable_execlists);
WARN_ON(!mutex_is_locked(&dev_priv->dev->struct_mutex));
if (to->legacy_hw_ctx.rcs_state == NULL) { /* We have the fake context */