[PATCH] intel: add a timed wait function

[Ben Widawsky <ben@bwidawsk.net>]

drm_intel_gem_bo_wait(bo, &timeout in ns)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 include/drm/i915_drm.h   |   10 ++++++++++
 intel/intel_bufmgr.h     |    1 +
 intel/intel_bufmgr_gem.c |   26 ++++++++++++++++++++++++++
 3 files changed, 37 insertions(+)

diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index af3ce17..5dc5f12 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -191,6 +191,7 @@ typedef struct _drm_i915_sarea {
 #define DRM_I915_GEM_EXECBUFFER2	0x29
 #define DRM_I915_GET_SPRITE_COLORKEY	0x2a
 #define DRM_I915_SET_SPRITE_COLORKEY	0x2b
+#define DRM_I915_GEM_WAIT	0x2c
 
 #define DRM_IOCTL_I915_INIT		DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
 #define DRM_IOCTL_I915_FLUSH		DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@@ -234,6 +235,7 @@ typedef struct _drm_i915_sarea {
 #define DRM_IOCTL_I915_OVERLAY_ATTRS	DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_OVERLAY_ATTRS, struct drm_intel_overlay_attrs)
 #define DRM_IOCTL_I915_SET_SPRITE_COLORKEY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_SET_SPRITE_COLORKEY, struct drm_intel_sprite_colorkey)
 #define DRM_IOCTL_I915_GET_SPRITE_COLORKEY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_SET_SPRITE_COLORKEY, struct drm_intel_sprite_colorkey)
+#define DRM_IOCTL_I915_GEM_WAIT		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_WAIT, struct drm_i915_gem_wait)
 
 /* Allow drivers to submit batchbuffers directly to hardware, relying
  * on the security mechanisms provided by hardware.
@@ -876,4 +878,12 @@ struct drm_intel_sprite_colorkey {
 	__u32 flags;
 };
 
+struct drm_i915_gem_wait {
+	/** Handle of BO we shall wait on */
+	__u32 bo_handle;
+	__u32 flags;
+	/** Number of nanoseconds to wait, Returns time remaining. */
+	__u64 timeout_ns;
+};
+
 #endif				/* _I915_DRM_H_ */
diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
index c197abc..d78884e 100644
--- a/intel/intel_bufmgr.h
+++ b/intel/intel_bufmgr.h
@@ -184,6 +184,7 @@ int drm_intel_get_pipe_from_crtc_id(drm_intel_bufmgr *bufmgr, int crtc_id);
 
 int drm_intel_get_aperture_sizes(int fd, size_t *mappable, size_t *total);
 int drm_intel_bufmgr_gem_get_devid(drm_intel_bufmgr *bufmgr);
+int drm_intel_gem_bo_wait(drm_intel_bo *bo, uint64_t *timeout_ns);
 
 /* drm_intel_bufmgr_fake.c */
 drm_intel_bufmgr *drm_intel_bufmgr_fake_init(int fd,
diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index b776d2f..695a449 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -1478,6 +1478,32 @@ drm_intel_gem_bo_wait_rendering(drm_intel_bo *bo)
 	drm_intel_gem_bo_start_gtt_access(bo, 1);
 }
 
+int drm_intel_gem_bo_wait(drm_intel_bo *bo, uint64_t *timeout_ns)
+{
+	drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *) bo->bufmgr;
+	drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
+	struct drm_i915_gem_wait wait;
+	int ret;
+
+	if (!timeout_ns)
+		return -EINVAL;
+
+	wait.bo_handle = bo_gem->gem_handle;
+	wait.timeout_ns = *timeout_ns;
+	wait.flags = 0;
+	ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GEM_WAIT, &wait);
+	if (ret)
+		return ret;
+
+	if (wait.timeout_ns == 0) {
+		DBG("Wait timed out on buffer %d\n", bo_gem->gem_handle);
+		*timeout_ns = 0;
+	} else
+		*timeout_ns = wait.timeout_ns;
+
+	return ret;
+}
+
 /**
  * Sets the object to the GTT read and possibly write domain, used by the X
  * 2D driver in the absence of kernel support to do drm_intel_gem_bo_map_gtt().
-- 
1.7.10.1