[PATCH v2 3/6] drm/v3d: Create a new V3D parameter for the maximum number of perfcnt

[Maíra Canal]

The maximum number of performance counters can change from version to
version and it's important for userspace to know this value, as it needs
to use the counters for performance queries. Therefore, expose the
maximum number of performance counters to userspace as a parameter.

Signed-off-by: Maíra Canal <mcanal at igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>
---
 drivers/gpu/drm/v3d/v3d_drv.c | 3 +++
 include/uapi/drm/v3d_drm.h    | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
index 6b9dd26df9fe..d2c1d5053132 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.c
+++ b/drivers/gpu/drm/v3d/v3d_drv.c
@@ -94,6 +94,9 @@ static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
 	case DRM_V3D_PARAM_SUPPORTS_CPU_QUEUE:
 		args->value = 1;
 		return 0;
+	case DRM_V3D_PARAM_MAX_PERF_COUNTERS:
+		args->value = v3d->max_counters;
+		return 0;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", args->param);
 		return -EINVAL;
diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
index dce1835eced4..215b01bb69c3 100644
--- a/include/uapi/drm/v3d_drm.h
+++ b/include/uapi/drm/v3d_drm.h
@@ -286,6 +286,7 @@ enum drm_v3d_param {
 	DRM_V3D_PARAM_SUPPORTS_PERFMON,
 	DRM_V3D_PARAM_SUPPORTS_MULTISYNC_EXT,
 	DRM_V3D_PARAM_SUPPORTS_CPU_QUEUE,
+	DRM_V3D_PARAM_MAX_PERF_COUNTERS,
 };
 
 struct drm_v3d_get_param {
-- 
2.44.0