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drm/i915: Reload PD tables after semaphore wait on gen8

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When the engine idles waiting upon a semaphore, it loses its
pagetables and we must reload them before executing the batch.

v2: Restrict w/a to non-RCS rings (RCS works correctly apparently).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461932305-14637-5-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-04-29 13:18:25 +01:00
parent f9a4ea35b8
commit 6ef48d7f01
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -1481,6 +1481,7 @@ gen8_ring_sync(struct drm_i915_gem_request *waiter_req,
{
struct intel_engine_cs *waiter = waiter_req->engine;
struct drm_i915_private *dev_priv = waiter->dev->dev_private;
struct i915_hw_ppgtt *ppgtt;
int ret;
ret = intel_ring_begin(waiter_req, 4);
@ -1496,6 +1497,15 @@ gen8_ring_sync(struct drm_i915_gem_request *waiter_req,
intel_ring_emit(waiter,
upper_32_bits(GEN8_WAIT_OFFSET(waiter, signaller->id)));
intel_ring_advance(waiter);
/* When the !RCS engines idle waiting upon a semaphore, they lose their
* pagetables and we must reload them before executing the batch.
* We do this on the i915_switch_context() following the wait and
* before the dispatch.
*/
ppgtt = waiter_req->ctx->ppgtt;
if (ppgtt && waiter_req->engine->id != RCS)
ppgtt->pd_dirty_rings |= intel_engine_flag(waiter_req->engine);
return 0;
}