All pinning must be done prior to i915_request_create, to avoid
timeline->mutex inversions.
Here we slightly abuse the context_barrier_task stages to utilise the
'skip' decision as an opportunity to acquire the pin on the new ppgtt.
Consider it s/skip/prepare/. At the moment, we only have on user of
context_barrier_task, so it might be worth breaking it down for the
specific task of set-vm and refactor it later if we find a second
purpose.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c
b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 9f1dc96b10a6..9d8d75765ee4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -1141,8 +1141,6 @@ static int emit_ppgtt_update(struct i915_request *rq,
void *data)
*cs++ = MI_NOOP;
intel_ring_advance(rq, cs);
} else {
- /* ppGTT is not part of the legacy context image */
- gen6_ppgtt_pin(i915_vm_to_ppgtt(vm));
}
return 0;
@@ -1150,10 +1148,20 @@ static int emit_ppgtt_update(struct i915_request *rq,
void *data)
static bool skip_ppgtt_update(struct intel_context *ce, void *data)
{
+ if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags))
+ return true;
+
if (HAS_LOGICAL_RING_CONTEXTS(ce->engine->i915))
- return !ce->state;
- else
- return !atomic_read(&ce->pin_count);
+ return false;
+
+ if (!atomic_read(&ce->pin_count))
+ return true;
+
+ /* ppGTT is not part of the legacy context image */
+ if (gen6_ppgtt_pin(i915_vm_to_ppgtt(ce->vm)))
+ return true;
+
+ return false;
}
static int set_ppgtt(struct drm_i915_file_private *file_priv,
--
2.24.0
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