video: tegra: nvmap: create per-pid debugfs memory data

/sys/kernel/debug/nvmap/handles_by_pid/<pid> will list the nvmap handles
owned by that pid in a versioned binary format.  This is intended for
automated collection of memory usage by a specific process.  For this
usecase, human-readability and per-heap breakdowns are unimportant, and
the reduced allocation size can help reduce memory fragmentation.

For the curious, /sys/kernel/debug/nvmap/<heap>/maps will still contain
per-heap mapping data in a human-readable format.

Change-Id: I22544a449c000e4bfec549cfadbb165703b64bd3
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Maneet Singh <mmaneetsingh@nvidia.com>
Reviewed-on: http://git-master/r/663318
(cherry picked from commit ecf87ac1f886125a2c11fb9b1ecc145fe6301565)
Reviewed-on: http://git-master/r/677358
GVS: Gerrit_Virtual_Submit
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/include/linux/nvmap.h b/include/linux/nvmap.h
index 290fa8484..11bfc9155 100644
--- a/include/linux/nvmap.h
+++ b/include/linux/nvmap.h
@@ -3,7 +3,7 @@
  *
  * structure declarations for nvmem and nvmap user-space ioctls
  *
- * Copyright (c) 2009-2014, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2009-2015, NVIDIA CORPORATION. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -235,6 +235,18 @@ struct nvmap_cache_op_list {
         __s32 op;               /* wb/wb_inv/inv */
 };
 
+struct nvmap_debugfs_handles_header {
+        __u8 version;
+};
+
+struct nvmap_debugfs_handles_entry {
+        __u64 base;
+        __u64 size;
+        __u32 flags;
+        __u32 share_count;
+        __u64 mapped_size;
+};
+
 #define NVMAP_IOC_MAGIC 'N'
 
 /* Creates a new memory handle. On input, the argument is the size of the new