mm/cma_debug.c

   1 /*
   2  * CMA DebugFS Interface
   3  *
   4  * Copyright (c) 2015 Sasha Levin <sasha.levin@oracle.com>
   5  */
   6
   7
   8 #include <linux/debugfs.h>
   9 #include <linux/cma.h>
  10
  11 #include "cma.h"
  12
  13 static struct dentry *cma_debugfs_root;
  14
  15 static int cma_debugfs_get(void *data, u64 *val)
  16 {
  17         unsigned long *p = data;
  18
  19         *val = *p;
  20
  21         return 0;
  22 }
  23
  24 DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");
  25
  26 static void cma_debugfs_add_one(struct cma *cma, int idx)
  27 {
  28         struct dentry *tmp;
  29         char name[16];
  30         int u32s;
  31
  32         sprintf(name, "cma-%d", idx);
  33
  34         tmp = debugfs_create_dir(name, cma_debugfs_root);
  35
  36         debugfs_create_file("base_pfn", S_IRUGO, tmp,
  37                                 &cma->base_pfn, &cma_debugfs_fops);
  38         debugfs_create_file("count", S_IRUGO, tmp,
  39                                 &cma->count, &cma_debugfs_fops);
  40         debugfs_create_file("order_per_bit", S_IRUGO, tmp,
  41                         &cma->order_per_bit, &cma_debugfs_fops);
  42
  43         u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));
  44         debugfs_create_u32_array("bitmap", S_IRUGO, tmp, (u32*)cma->bitmap, u32s);
  45 }
  46
  47 static int __init cma_debugfs_init(void)
  48 {
  49         int i;
  50
  51         cma_debugfs_root = debugfs_create_dir("cma", NULL);
  52         if (!cma_debugfs_root)
  53                 return -ENOMEM;
  54
  55         for (i = 0; i < cma_area_count; i++)
  56                 cma_debugfs_add_one(&cma_areas[i], i);
  57
  58         return 0;
  59 }
  60 late_initcall(cma_debugfs_init);