drm/nouveau: Add getparam for current PTIMER time.

This will be useful for computing GPU-CPU latency, including
GL_ARB_timer_query extension.

Signed-off-by: Marcin Kościelnicki <koriakin@0x04.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index e632339c323e..a2544ffd02cc 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -913,6 +913,9 @@ int nouveau_ioctl_getparam(struct drm_device *dev, void *data,
         case NOUVEAU_GETPARAM_VM_VRAM_BASE:
                 getparam->value = dev_priv->vm_vram_base;
                 break;
+        case NOUVEAU_GETPARAM_PTIMER_TIME:
+                getparam->value = dev_priv->engine.timer.read(dev);
+                break;
         case NOUVEAU_GETPARAM_GRAPH_UNITS:
                 /* NV40 and NV50 versions are quite different, but register
                  * address is the same. User is supposed to know the card
diff --git a/include/drm/nouveau_drm.h b/include/drm/nouveau_drm.h
index a6a9f4af5ebd..fe917dee723a 100644
--- a/include/drm/nouveau_drm.h
+++ b/include/drm/nouveau_drm.h
@@ -79,6 +79,7 @@ struct drm_nouveau_gpuobj_free {
 #define NOUVEAU_GETPARAM_CHIPSET_ID      11
 #define NOUVEAU_GETPARAM_VM_VRAM_BASE    12
 #define NOUVEAU_GETPARAM_GRAPH_UNITS     13
+#define NOUVEAU_GETPARAM_PTIMER_TIME     14
 struct drm_nouveau_getparam {
         uint64_t param;
         uint64_t value;