[RFC PATCH 3/5] drm/i915: Expose logical engine instance to user

[Matthew Brost]

Expose logical engine instance to user via query engine info IOCTL. This
is required for split-frame workloads as these need to be placed on
engines in a logically contiguous order. The logical mapping can change
based on fusing. Rather than having user have knowledge of the fusing we
simply just expose the logical mapping with the existing query engine
info IOCTL.

Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Tony Ye <tony.ye at intel.com>
CC: Carl Zhang <carl.zhang at intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Jason Ekstrand <jason at jlekstrand.net>
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
 include/uapi/drm/i915_drm.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 9f331ad629f5..26d2e135aa31 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2396,14 +2396,19 @@ struct drm_i915_engine_info {
 
 	/** @flags: Engine flags. */
 	__u64 flags;
+#define I915_ENGINE_INFO_HAS_LOGICAL_INSTANCE		(1 << 0)
 
 	/** @capabilities: Capabilities of this engine. */
 	__u64 capabilities;
 #define I915_VIDEO_CLASS_CAPABILITY_HEVC		(1 << 0)
 #define I915_VIDEO_AND_ENHANCE_CLASS_CAPABILITY_SFC	(1 << 1)
 
+	/** Logical engine instance */
+	__u16 logical_instance;
+
 	/** @rsvd1: Reserved fields. */
-	__u64 rsvd1[4];
+	__u16 rsvd1[3];
+	__u64 rsvd2[3];
 };
 
 /**
-- 
2.28.0