[Intel-gfx] [PATCH] drm/i915/gvt: query if vgpu is active via GETPARAM IOCTL

[Shaofeng Tang]

[Why]
Query if vgpu is active, it is useful to the user.
Currently, only the primary plane is usable when vgpu is active.
The value of vgpu active is useful for user to determine
how many planes can be used. also useful for user to
determine different behaviors according to vgpu is active or not.

[How]
Add a switch-case in the IOCTL 'i915_getparam_ioctl' to
return 'intel_vgpu_active'

Signed-off-by: Shaofeng Tang <shaofeng.tang at intel.com>
---
 drivers/gpu/drm/i915/i915_getparam.c | 3 +++
 include/uapi/drm/i915_drm.h          | 6 ++++++
 tools/include/uapi/drm/i915_drm.h    | 6 ++++++
 3 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c
index d042644..c50555b 100644
--- a/drivers/gpu/drm/i915/i915_getparam.c
+++ b/drivers/gpu/drm/i915/i915_getparam.c
@@ -161,6 +161,9 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data,
 	case I915_PARAM_PERF_REVISION:
 		value = i915_perf_ioctl_version();
 		break;
+	case I915_PARAM_IS_GVT:
+		value = intel_vgpu_active(i915);
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 14b67cd..74f06e2 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -619,6 +619,12 @@ enum drm_i915_pmu_engine_sample {
  */
 #define I915_PARAM_PERF_REVISION	54
 
+/*
+ * Query whether GVT is active. The value returned helps userspace application
+ * to determine what KMS resources are workable.
+ */
+#define I915_PARAM_IS_GVT	55
+
 /* Must be kept compact -- no holes and well documented */
 
 typedef struct drm_i915_getparam {
diff --git a/tools/include/uapi/drm/i915_drm.h b/tools/include/uapi/drm/i915_drm.h
index 2813e57..ecaad82 100644
--- a/tools/include/uapi/drm/i915_drm.h
+++ b/tools/include/uapi/drm/i915_drm.h
@@ -619,6 +619,12 @@ enum drm_i915_pmu_engine_sample {
  */
 #define I915_PARAM_PERF_REVISION	54
 
+/*
+ * Query whether GVT is active. The value returned helps userspace application
+ * to determine what KMS resources are workable.
+ */
+#define I915_PARAM_IS_GVT      55
+
 /* Must be kept compact -- no holes and well documented */
 
 typedef struct drm_i915_getparam {
-- 
1.9.1