t194: cache: l3 cache

It adds ioctl to get  gpu_cpu_ways, gpu_only_ways.
It sets gpu_l3_ways(max) and gpu_l3_only_ways(min)
to program l3 cache.

It exposes debugfs nodes to set/get -
- gpu_cpu_ways
- gpu_only_ways

It also exposes debugfs node to get -
- total_ways
- L3 cache size

Bug 200324092

Change-Id: Ibef7484be30041825ff2324791c9455e4e70bd4d
Signed-off-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1520534
Reviewed-by: Sachin Nikam <snikam@nvidia.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/include/uapi/linux/t19x_cache.h b/include/uapi/linux/t19x_cache.h
new file mode 100644
index 000000000..98dfd12fa
--- /dev/null
+++ b/include/uapi/linux/t19x_cache.h
@@ -0,0 +1,45 @@
+/*
+ * t19x_cache.h
+ *
+ * declarations for t19x cache
+ *
+ * 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 __T19x_CACHE_H
+#define __T19x_CACHE_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+#define  TEGRA_L3_CACHE_IOC_MAGIC 'C'
+
+#if !defined(__KERNEL__)
+#define __user
+#endif
+
+struct tegra_l3_ioctl_data {
+        __u32 igpu_cpu_ways; /* integrated gpu */
+        __u32 igpu_only_ways;
+        __u32 total_ways;
+        __u32 reserved;
+        __u64 size;
+};
+
+#define TEGRA_L3_CACHE_GET_IOCTL_DATA    \
+                _IOWR(TEGRA_L3_CACHE_IOC_MAGIC, 1, struct tegra_l3_ioctl_data)
+
+#define TEGRA_L3_CACHE_IOCTL_IOC_MAXNR _IOC_NR(TEGRA_L3_CACHE_GET_IOCTL_DATA)
+#define TEGRA_L3_CACHE_IOCTL_MAX_ARG_SIZE  \
+                sizeof(struct tegra_l3_ioctl_data)
+
+#endif /*  __T19x_CACHE_H */