[Intel-gfx] [PATCH 11/26] drm/i915/guc: Implement parallel context pin / unpin functions

Matthew Brost
2021-10-04T22:12:05Z

Parallel contexts are perma-pinned by the upper layers which makes the
backend implementation rather simple. The parent pins the guc_id and
children increment the parent's pin count on pin to ensure all the
contexts are unpinned before we disable scheduling with the GuC / or
deregister the context.

v2:
(Daniel Vetter)
- Perma-pin parallel contexts

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 70 +++++++++++++++++++
1 file changed, 70 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 79e7732e83b2..031b1bf5ba91 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -2583,6 +2583,76 @@ static const struct intel_context_ops virtual_guc_context_ops = {
.get_sibling = guc_virtual_get_sibling,
};

+/* Future patches will use this function */
+__maybe_unused
+static int guc_parent_context_pin(struct intel_context *ce, void *vaddr)
+{
+ struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);
+ struct intel_guc *guc = ce_to_guc(ce);
+ int ret;
+
+ GEM_BUG_ON(!intel_context_is_parent(ce));
+ GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));
+
+ ret = pin_guc_id(guc, ce);
+ if (unlikely(ret < 0))
+ return ret;
+
+ return __guc_context_pin(ce, engine, vaddr);
+}
+
+/* Future patches will use this function */
+__maybe_unused
+static int guc_child_context_pin(struct intel_context *ce, void *vaddr)
+{
+ struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);
+
+ GEM_BUG_ON(!intel_context_is_child(ce));
+ GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));
+
+ __intel_context_pin(ce->parallel.parent);
+ return __guc_context_pin(ce, engine, vaddr);
+}
+
+/* Future patches will use this function */
+__maybe_unused
+static void guc_parent_context_unpin(struct intel_context *ce)
+{
+ struct intel_guc *guc = ce_to_guc(ce);
+
+ GEM_BUG_ON(context_enabled(ce));
+ GEM_BUG_ON(intel_context_is_barrier(ce));
+ GEM_BUG_ON(!intel_context_is_parent(ce));
+ GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));
+
+ unpin_guc_id(guc, ce);
+ lrc_unpin(ce);
+}
+
+/* Future patches will use this function */
+__maybe_unused
+static void guc_child_context_unpin(struct intel_context *ce)
+{
+ GEM_BUG_ON(context_enabled(ce));
+ GEM_BUG_ON(intel_context_is_barrier(ce));
+ GEM_BUG_ON(!intel_context_is_child(ce));
+ GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));
+
+ lrc_unpin(ce);
+}
+
+/* Future patches will use this function */
+__maybe_unused
+static void guc_child_context_post_unpin(struct intel_context *ce)
+{
+ GEM_BUG_ON(!intel_context_is_child(ce));
+ GEM_BUG_ON(!intel_context_is_pinned(ce->parallel.parent));
+ GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));
+
+ lrc_post_unpin(ce);
+ intel_context_unpin(ce->parallel.parent);
+}
+
static bool
guc_irq_enable_breadcrumbs(struct intel_breadcrumbs *b)
{
--
2.32.0