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1/**
2 * @file oprofile.h
3 *
4 * API for machine-specific interrupts to interface
5 * to oprofile.
6 *
7 * @remark Copyright 2002 OProfile authors
8 * @remark Read the file COPYING
9 *
10 * @author John Levon <levon@movementarian.org>
11 */
12
13#ifndef OPROFILE_H
14#define OPROFILE_H
15
16#include <linux/types.h>
17#include <linux/spinlock.h>
18#include <asm/atomic.h>
19
20/* Each escaped entry is prefixed by ESCAPE_CODE
21 * then one of the following codes, then the
22 * relevant data.
23 * These #defines live in this file so that arch-specific
24 * buffer sync'ing code can access them.
25 */
26#define ESCAPE_CODE ~0UL
27#define CTX_SWITCH_CODE 1
28#define CPU_SWITCH_CODE 2
29#define COOKIE_SWITCH_CODE 3
30#define KERNEL_ENTER_SWITCH_CODE 4
31#define KERNEL_EXIT_SWITCH_CODE 5
32#define MODULE_LOADED_CODE 6
33#define CTX_TGID_CODE 7
34#define TRACE_BEGIN_CODE 8
35#define TRACE_END_CODE 9
36#define XEN_ENTER_SWITCH_CODE 10
37#define SPU_PROFILING_CODE 11
38#define SPU_CTX_SWITCH_CODE 12
39#define IBS_FETCH_CODE 13
40#define IBS_OP_CODE 14
41
42struct super_block;
43struct dentry;
44struct file_operations;
45struct pt_regs;
46
47/* Operations structure to be filled in */
48struct oprofile_operations {
49 /* create any necessary configuration files in the oprofile fs.
50 * Optional. */
51 int (*create_files)(struct super_block * sb, struct dentry * root);
52 /* Do any necessary interrupt setup. Optional. */
53 int (*setup)(void);
54 /* Do any necessary interrupt shutdown. Optional. */
55 void (*shutdown)(void);
56 /* Start delivering interrupts. */
57 int (*start)(void);
58 /* Stop delivering interrupts. */
59 void (*stop)(void);
60 /* Arch-specific buffer sync functions.
61 * Return value = 0: Success
62 * Return value = -1: Failure
63 * Return value = 1: Run generic sync function
64 */
65 int (*sync_start)(void);
66 int (*sync_stop)(void);
67
68 /* Initiate a stack backtrace. Optional. */
69 void (*backtrace)(struct pt_regs * const regs, unsigned int depth);
70 /* CPU identification string. */
71 char * cpu_type;
72};
73
74/**
75 * One-time initialisation. *ops must be set to a filled-in
76 * operations structure. This is called even in timer interrupt
77 * mode so an arch can set a backtrace callback.
78 *
79 * If an error occurs, the fields should be left untouched.
80 */
81int oprofile_arch_init(struct oprofile_operations * ops);
82
83/**
84 * One-time exit/cleanup for the arch.
85 */
86void oprofile_arch_exit(void);
87
88/**
89 * Add a sample. This may be called from any context. Pass
90 * smp_processor_id() as cpu.
91 */
92void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
93
94/**
95 * Add an extended sample. Use this when the PC is not from the regs, and
96 * we cannot determine if we're in kernel mode from the regs.
97 *
98 * This function does perform a backtrace.
99 *
100 */
101void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
102 unsigned long event, int is_kernel);
103
104/* Use this instead when the PC value is not from the regs. Doesn't
105 * backtrace. */
106void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);
107
108/* add a backtrace entry, to be called from the ->backtrace callback */
109void oprofile_add_trace(unsigned long eip);
110
111
112/**
113 * Create a file of the given name as a child of the given root, with
114 * the specified file operations.
115 */
116int oprofilefs_create_file(struct super_block * sb, struct dentry * root,
117 char const * name, const struct file_operations * fops);
118
119int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root,
120 char const * name, const struct file_operations * fops, int perm);
121
122/** Create a file for read/write access to an unsigned long. */
123int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root,
124 char const * name, ulong * val);
125
126/** Create a file for read-only access to an unsigned long. */
127int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root,
128 char const * name, ulong * val);
129
130/** Create a file for read-only access to an atomic_t. */
131int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root,
132 char const * name, atomic_t * val);
133
134/** create a directory */
135struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root,
136 char const * name);
137
138/**
139 * Write the given asciz string to the given user buffer @buf, updating *offset
140 * appropriately. Returns bytes written or -EFAULT.
141 */
142ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset);
143
144/**
145 * Convert an unsigned long value into ASCII and copy it to the user buffer @buf,
146 * updating *offset appropriately. Returns bytes written or -EFAULT.
147 */
148ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset);
149
150/**
151 * Read an ASCII string for a number from a userspace buffer and fill *val on success.
152 * Returns 0 on success, < 0 on error.
153 */
154int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);
155
156/** lock for read/write safety */
157extern spinlock_t oprofilefs_lock;
158
159/**
160 * Add the contents of a circular buffer to the event buffer.
161 */
162void oprofile_put_buff(unsigned long *buf, unsigned int start,
163 unsigned int stop, unsigned int max);
164
165unsigned long oprofile_get_cpu_buffer_size(void);
166void oprofile_cpu_buffer_inc_smpl_lost(void);
167
168#endif /* OPROFILE_H */