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 <linux/init.h>
19 #include <linux/errno.h>
20 #include <linux/printk.h>
21 #include <linux/atomic.h>
22
23 /* Each escaped entry is prefixed by ESCAPE_CODE
24 * then one of the following codes, then the
25 * relevant data.
26 * These #defines live in this file so that arch-specific
27 * buffer sync'ing code can access them.
28 */
29 #define ESCAPE_CODE ~0UL
30 #define CTX_SWITCH_CODE 1
31 #define CPU_SWITCH_CODE 2
32 #define COOKIE_SWITCH_CODE 3
33 #define KERNEL_ENTER_SWITCH_CODE 4
34 #define KERNEL_EXIT_SWITCH_CODE 5
35 #define MODULE_LOADED_CODE 6
36 #define CTX_TGID_CODE 7
37 #define TRACE_BEGIN_CODE 8
38 #define TRACE_END_CODE 9
39 #define XEN_ENTER_SWITCH_CODE 10
40 #define SPU_PROFILING_CODE 11
41 #define SPU_CTX_SWITCH_CODE 12
42 #define IBS_FETCH_CODE 13
43 #define IBS_OP_CODE 14
44
45 struct dentry;
46 struct file_operations;
47 struct pt_regs;
48
49 /* Operations structure to be filled in */
50 struct oprofile_operations {
51 /* create any necessary configuration files in the oprofile fs.
52 * Optional. */
53 int (*create_files)(struct dentry * root);
54 /* Do any necessary interrupt setup. Optional. */
55 int (*setup)(void);
56 /* Do any necessary interrupt shutdown. Optional. */
57 void (*shutdown)(void);
58 /* Start delivering interrupts. */
59 int (*start)(void);
60 /* Stop delivering interrupts. */
61 void (*stop)(void);
62 /* Arch-specific buffer sync functions.
63 * Return value = 0: Success
64 * Return value = -1: Failure
65 * Return value = 1: Run generic sync function
66 */
67 int (*sync_start)(void);
68 int (*sync_stop)(void);
69
70 /* Initiate a stack backtrace. Optional. */
71 void (*backtrace)(struct pt_regs * const regs, unsigned int depth);
72
73 /* Multiplex between different events. Optional. */
74 int (*switch_events)(void);
75 /* CPU identification string. */
76 char * cpu_type;
77 };
78
79 /**
80 * One-time initialisation. *ops must be set to a filled-in
81 * operations structure. This is called even in timer interrupt
82 * mode so an arch can set a backtrace callback.
83 *
84 * If an error occurs, the fields should be left untouched.
85 */
86 int oprofile_arch_init(struct oprofile_operations * ops);
87
88 /**
89 * One-time exit/cleanup for the arch.
90 */
91 void oprofile_arch_exit(void);
92
93 /**
94 * Add a sample. This may be called from any context.
95 */
96 void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
97
98 /**
99 * Add an extended sample. Use this when the PC is not from the regs, and
100 * we cannot determine if we're in kernel mode from the regs.
101 *
102 * This function does perform a backtrace.
103 *
104 */
105 void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
106 unsigned long event, int is_kernel);
107
108 /**
109 * Add an hardware sample.
110 */
111 void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
112 unsigned long event, int is_kernel,
113 struct task_struct *task);
114
115 /* Use this instead when the PC value is not from the regs. Doesn't
116 * backtrace. */
117 void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);
118
119 /* add a backtrace entry, to be called from the ->backtrace callback */
120 void oprofile_add_trace(unsigned long eip);
121
122
123 /**
124 * Create a file of the given name as a child of the given root, with
125 * the specified file operations.
126 */
127 int oprofilefs_create_file(struct dentry * root,
128 char const * name, const struct file_operations * fops);
129
130 int oprofilefs_create_file_perm(struct dentry * root,
131 char const * name, const struct file_operations * fops, int perm);
132
133 /** Create a file for read/write access to an unsigned long. */
134 int oprofilefs_create_ulong(struct dentry * root,
135 char const * name, ulong * val);
136
137 /** Create a file for read-only access to an unsigned long. */
138 int oprofilefs_create_ro_ulong(struct dentry * root,
139 char const * name, ulong * val);
140
141 /** Create a file for read-only access to an atomic_t. */
142 int oprofilefs_create_ro_atomic(struct dentry * root,
143 char const * name, atomic_t * val);
144
145 /** create a directory */
146 struct dentry *oprofilefs_mkdir(struct dentry *parent, char const *name);
147
148 /**
149 * Write the given asciz string to the given user buffer @buf, updating *offset
150 * appropriately. Returns bytes written or -EFAULT.
151 */
152 ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset);
153
154 /**
155 * Convert an unsigned long value into ASCII and copy it to the user buffer @buf,
156 * updating *offset appropriately. Returns bytes written or -EFAULT.
157 */
158 ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset);
159
160 /**
161 * Read an ASCII string for a number from a userspace buffer and fill *val on success.
162 * Returns 0 on success, < 0 on error.
163 */
164 int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);
165
166 /** lock for read/write safety */
167 extern raw_spinlock_t oprofilefs_lock;
168
169 /**
170 * Add the contents of a circular buffer to the event buffer.
171 */
172 void oprofile_put_buff(unsigned long *buf, unsigned int start,
173 unsigned int stop, unsigned int max);
174
175 unsigned long oprofile_get_cpu_buffer_size(void);
176 void oprofile_cpu_buffer_inc_smpl_lost(void);
177
178 /* cpu buffer functions */
179
180 struct op_sample;
181
182 struct op_entry {
183 struct ring_buffer_event *event;
184 struct op_sample *sample;
185 unsigned long size;
186 unsigned long *data;
187 };
188
189 void oprofile_write_reserve(struct op_entry *entry,
190 struct pt_regs * const regs,
191 unsigned long pc, int code, int size);
192 int oprofile_add_data(struct op_entry *entry, unsigned long val);
193 int oprofile_add_data64(struct op_entry *entry, u64 val);
194 int oprofile_write_commit(struct op_entry *entry);
195
196 #ifdef CONFIG_HW_PERF_EVENTS
197 int __init oprofile_perf_init(struct oprofile_operations *ops);
198 void oprofile_perf_exit(void);
199 char *op_name_from_perf_id(void);
200 #else
oprofile_perf_init(struct oprofile_operations * ops)201 static inline int __init oprofile_perf_init(struct oprofile_operations *ops)
202 {
203 pr_info("oprofile: hardware counters not available\n");
204 return -ENODEV;
205 }
oprofile_perf_exit(void)206 static inline void oprofile_perf_exit(void) { }
207 #endif /* CONFIG_HW_PERF_EVENTS */
208
209 #endif /* OPROFILE_H */
210