This patch introduces the support of LRC context single submission.
As GVT context may come from different guests, which require different
configuration of render registers. It can't be combined into a dual ELSP
submission combo.
Only GVT-g will create this kinds of GEM context currently.
v7:
- Fix typos in commit message. (Joonas)
v6:
- Make GVT code as dead code when !CONFIG_DRM_I915_GVT. (Chris)
v5:
- Only compile this feature when CONFIG_DRM_I915_GVT=y. (Tvrtko)
Signed-off-by: Zhi Wang <zhi.a.wang@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_lrc.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4ab4cf7..8f8a5bc 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -882,6 +882,7 @@ struct i915_gem_context {
u32 lrc_addressing_mode_bits;
struct atomic_notifier_head status_notifier;
bool enable_lrc_status_change_notification;
+ bool enable_lrc_single_submission;
struct list_head link;
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 956585d..e3cab06 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -447,6 +447,21 @@ static void execlists_context_unqueue(struct intel_engine_cs *engine)
i915_gem_request_unreference(req0);
req0 = cursor;
} else {
+ /* Compiler will do the dead-code elimination */
+ if (IS_ENABLED(CONFIG_DRM_I915_GVT)) {
+ /*
+ * req0 (after merged) ctx requires single
+ * submission, stop picking
+ */
+ if (req0->ctx->enable_lrc_single_submission)
+ break;
+ /*
+ * req0 ctx doesn't require single submission,
+ * but next req ctx requires, stop picking
+ */
+ if (cursor->ctx->enable_lrc_single_submission)
+ break;
+ }
req1 = cursor;
WARN_ON(req1->elsp_submitted);
break;
--
1.9.1
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