include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / arch / cris / kernel / profile.c
1 #include <linux/init.h>
2 #include <linux/errno.h>
3 #include <linux/kernel.h>
4 #include <linux/proc_fs.h>
5 #include <linux/slab.h>
6 #include <linux/types.h>
7 #include <asm/ptrace.h>
8 #include <asm/uaccess.h>
9
10 #define SAMPLE_BUFFER_SIZE 8192
11
12 static char* sample_buffer;
13 static char* sample_buffer_pos;
14 static int prof_running = 0;
15
16 void
17 cris_profile_sample(struct pt_regs* regs)
18 {
19         if (!prof_running)
20                 return;
21
22         if (user_mode(regs))
23                 *(unsigned int*)sample_buffer_pos = current->pid;
24         else
25                 *(unsigned int*)sample_buffer_pos = 0;
26
27         *(unsigned int*)(sample_buffer_pos + 4) = instruction_pointer(regs);
28         sample_buffer_pos += 8;
29
30         if (sample_buffer_pos == sample_buffer + SAMPLE_BUFFER_SIZE)
31                 sample_buffer_pos = sample_buffer;
32 }
33
34 static ssize_t
35 read_cris_profile(struct file *file, char __user *buf,
36                   size_t count, loff_t *ppos)
37 {
38         unsigned long p = *ppos;
39         ssize_t ret;
40
41         ret = simple_read_from_buffer(buf, count, ppos, sample_buffer,
42                                                 SAMPLE_BUFFER_SIZE);
43         if (ret < 0)
44                 return ret;
45
46         memset(sample_buffer + p, 0, ret);
47
48         return ret;
49 }
50
51 static ssize_t
52 write_cris_profile(struct file *file, const char __user *buf,
53                    size_t count, loff_t *ppos)
54 {
55         sample_buffer_pos = sample_buffer;
56         memset(sample_buffer, 0, SAMPLE_BUFFER_SIZE);
57 }
58
59 static const struct file_operations cris_proc_profile_operations = {
60         .read           = read_cris_profile,
61         .write          = write_cris_profile,
62 };
63
64 static int
65 __init init_cris_profile(void)
66 {
67         struct proc_dir_entry *entry;
68
69         sample_buffer = kmalloc(SAMPLE_BUFFER_SIZE, GFP_KERNEL);
70         if (!sample_buffer) {
71                 return -ENOMEM;
72         }
73
74         sample_buffer_pos = sample_buffer;
75
76         entry = proc_create("system_profile", S_IWUSR | S_IRUGO, NULL,
77                             &cris_proc_profile_operations);
78         if (entry) {
79                 entry->size = SAMPLE_BUFFER_SIZE;
80         }
81         prof_running = 1;
82
83         return 0;
84 }
85
86 __initcall(init_cris_profile);