accel/ivpu: Document DRM_IVPU_PARAM_CAPABILITIES

Add comments regarding new DRM_IVPU_PARAM_CAPABILITIES param.
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230810080707.3545883-1-stanislaw.gruszka@linux.intel.com

include/uapi/drm/ivpu_accel.h

@@ -69,8 +69,20 @@ extern "C" {
 #define DRM_IVPU_CONTEXT_PRIORITY_FOCUS	    2
 #define DRM_IVPU_CONTEXT_PRIORITY_REALTIME  3
 
-#define DRM_IVPU_CAP_METRIC_STREAMER	    1
-#define DRM_IVPU_CAP_DMA_MEMORY_RANGE       2
+/**
+ * DRM_IVPU_CAP_METRIC_STREAMER
+ *
+ * Metric streamer support. Provides sampling of various hardware performance
+ * metrics like DMA bandwidth and cache miss/hits. Can be used for profiling.
+ */
+#define DRM_IVPU_CAP_METRIC_STREAMER	1
+/**
+ * DRM_IVPU_CAP_DMA_MEMORY_RANGE
+ *
+ * Driver has capability to allocate separate memory range
+ * accessible by hardware DMA.
+ */
+#define DRM_IVPU_CAP_DMA_MEMORY_RANGE	2
 
 /**
  * struct drm_ivpu_param - Get/Set VPU parameters
@@ -123,6 +135,8 @@ struct drm_ivpu_param {
 	 * %DRM_IVPU_PARAM_SKU:
 	 * VPU SKU ID (read-only)
 	 *
+	 * %DRM_IVPU_PARAM_CAPABILITIES:
+	 * Supported capabilities (read-only)
 	 */
 	__u32 param;