This patch introduces the support of context signle submission. As GVT
context may come from different guests, which requires different
configuration of render registers. It can't be combined in a dual ELSP
submission combo.
We make this function as a context feature in context creation service.
Only GVT-g will create this kinds of GEM context currently.
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 | 2 +-
drivers/gpu/drm/i915/intel_lrc.c | 15 +++++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 9688006..b8f1e9a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -890,8 +890,8 @@ struct intel_context {
bool use_48bit_addressing_mode;
#if IS_ENABLED(CONFIG_DRM_I915_GVT)
bool enable_status_change_notification;
+ bool single_submission;
#endif
-
struct list_head link;
};
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 9069836..8d1a9c2 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -455,6 +455,21 @@ static void execlists_context_unqueue(struct intel_engine_cs *engine)
i915_gem_request_unreference(req0);
req0 = cursor;
} else {
+#if IS_ENABLED(CONFIG_DRM_I915_GVT)
+
+ /*
+ * req0 (after merged) ctx requires single submission,
+ * stop picking
+ */
+ if (req0->ctx->single_submission)
+ break;
+ /*
+ * req0 ctx doesn't require single submission, but
+ * next req ctx requires, stop picking req1
+ */
+ if (cursor->ctx->single_submission)
+ break;
+#endif
req1 = cursor;
WARN_ON(req1->elsp_submitted);
break;
--
1.9.1
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