lib/intel_ctx: Add load balancing support (v2)

We use the same convention as the load balancing tests and, when
balancing is requested, we make a context with N+1 engines where the
first one is the balanced engine and the others are physical engines.

v2 (Zbigniew Kempczyński):
 - Don't initialize num_logical_engines
 - Use igt_assert() instead of assert()

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/intel_ctx.h b/lib/intel_ctx.h
index e34cefc1..d4cb435a 100644
--- a/lib/intel_ctx.h
+++ b/lib/intel_ctx.h
@@ -17,6 +17,7 @@
  * @flags: Context create flags
  * @vm: VM to inherit or 0 for using a per-context VM
  * @nopersist: set I915_CONTEXT_PARAM_PERSISTENCE to 0
+ * @load_balance: True if the first engine should be a load balancing engine
  * @num_engines: Number of client-specified engines or 0 for legacy mode
  * @engines: Client-specified engines
  *
@@ -44,6 +45,7 @@ typedef struct intel_ctx_cfg {
 	uint32_t flags;
 	uint32_t vm;
 	bool nopersist;
+	bool load_balance;
 	unsigned int num_engines;
 	struct i915_engine_class_instance engines[GEM_MAX_ENGINES];
 } intel_ctx_cfg_t;