lib: Add media spin

The media spin utility is derived from media fill. The purpose
is to create a simple means to keep the render engine (media
pipeline) busy for a controlled amount of time. It does so by
emitting a batch with a single execution thread that spins in
a tight loop the requested number of times. Each spin increments
a counter whose final 32-bit value is written to the destination
buffer on completion for checking. The implementation supports
Gen8, Gen8lp, and Gen9.

v2: Apply the recommendations of igt.cocci.

Signed-off-by: Jeff McGee <jeff.mcgee@intel.com>
Tested-by: Lei Liu <lei.a.liu@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/intel_batchbuffer.c b/lib/intel_batchbuffer.c
index 1aa4ec34..a1b0643f 100644
--- a/lib/intel_batchbuffer.c
+++ b/lib/intel_batchbuffer.c
@@ -40,6 +40,7 @@
 #include "rendercopy.h"
 #include "media_fill.h"
 #include "ioctl_wrappers.h"
+#include "media_spin.h"
 
 #include <i915_drm.h>
 
@@ -788,3 +789,26 @@ igt_fillfunc_t igt_get_gpgpu_fillfunc(int devid)
 
 	return fill;
 }
+
+/**
+ * igt_get_media_spinfunc:
+ * @devid: pci device id
+ *
+ * Returns:
+ *
+ * The platform-specific media spin function pointer for the device specified
+ * with @devid. Will return NULL when no media spin function is implemented.
+ */
+igt_media_spinfunc_t igt_get_media_spinfunc(int devid)
+{
+	igt_media_spinfunc_t spin = NULL;
+
+	if (IS_GEN9(devid))
+		spin = gen9_media_spinfunc;
+	else if (IS_BROADWELL(devid))
+		spin = gen8_media_spinfunc;
+	else if (IS_CHERRYVIEW(devid))
+		spin = gen8lp_media_spinfunc;
+
+	return spin;
+}