1 files changed, 58 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/xve.h b/drivers/gpu/nvgpu/include/nvgpu/xve.h
new file mode 100644
index 00000000..ee599300
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/xve.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#ifndef __NVGPU_XVE_H__
+#define __NVGPU_XVE_H__
+
+#include <nvgpu/types.h>
+#include <nvgpu/log2.h>
+
+/*
+ * For the available speeds bitmap.
+ */
+#define GPU_XVE_SPEED_2P5       (1 << 0)
+#define GPU_XVE_SPEED_5P0       (1 << 1)
+#define GPU_XVE_SPEED_8P0       (1 << 2)
+#define GPU_XVE_NR_SPEEDS       3
+
+#define GPU_XVE_SPEED_MASK      (GPU_XVE_SPEED_2P5 |    \
+                                 GPU_XVE_SPEED_5P0 |    \
+                                 GPU_XVE_SPEED_8P0)
+
+/*
+ * The HW uses a 2 bit field where speed is defined by a number:
+ *
+ *   NV_XVE_LINK_CONTROL_STATUS_LINK_SPEED_2P5 = 1
+ *   NV_XVE_LINK_CONTROL_STATUS_LINK_SPEED_5P0 = 2
+ *   NV_XVE_LINK_CONTROL_STATUS_LINK_SPEED_8P0 = 3
+ *
+ * This isn't ideal for a bitmap with available speeds. So the external
+ * APIs think about speeds as a bit in a bitmap and this function converts
+ * from those bits to the actual HW speed setting.
+ *
+ * @speed_bit must have only 1 bit set and must be one of the 3 available
+ * HW speeds. Not all chips support all speeds so use available_speeds() to
+ * determine what a given chip supports.
+ */
+static inline const char *xve_speed_to_str(u32 speed)
+{
+        if (!speed || !is_power_of_2(speed) ||
+            !(speed & GPU_XVE_SPEED_MASK))
+                return "Unknown ???";
+
+        return speed & GPU_XVE_SPEED_2P5 ? "Gen1" :
+               speed & GPU_XVE_SPEED_5P0 ? "Gen2" :
+               speed & GPU_XVE_SPEED_8P0 ? "Gen3" :
+               "Unknown ???";
+}
+
+#endif