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1da177e4 LT |
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> | |
3d90a007 | 18 | #include <linux/init.h> |
d14dd7e2 AK |
19 | #include <linux/errno.h> |
20 | #include <linux/printk.h> | |
60063497 | 21 | #include <linux/atomic.h> |
1da177e4 | 22 | |
1474855d BN |
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 | |
ee648bc7 RR |
42 | #define IBS_FETCH_CODE 13 |
43 | #define IBS_OP_CODE 14 | |
1474855d | 44 | |
1da177e4 LT |
45 | struct super_block; |
46 | struct dentry; | |
47 | struct file_operations; | |
48 | struct pt_regs; | |
49 | ||
50 | /* Operations structure to be filled in */ | |
51 | struct oprofile_operations { | |
52 | /* create any necessary configuration files in the oprofile fs. | |
53 | * Optional. */ | |
54 | int (*create_files)(struct super_block * sb, struct dentry * root); | |
55 | /* Do any necessary interrupt setup. Optional. */ | |
56 | int (*setup)(void); | |
57 | /* Do any necessary interrupt shutdown. Optional. */ | |
58 | void (*shutdown)(void); | |
59 | /* Start delivering interrupts. */ | |
60 | int (*start)(void); | |
61 | /* Stop delivering interrupts. */ | |
62 | void (*stop)(void); | |
1474855d BN |
63 | /* Arch-specific buffer sync functions. |
64 | * Return value = 0: Success | |
65 | * Return value = -1: Failure | |
66 | * Return value = 1: Run generic sync function | |
67 | */ | |
68 | int (*sync_start)(void); | |
69 | int (*sync_stop)(void); | |
70 | ||
1da177e4 LT |
71 | /* Initiate a stack backtrace. Optional. */ |
72 | void (*backtrace)(struct pt_regs * const regs, unsigned int depth); | |
4d4036e0 JY |
73 | |
74 | /* Multiplex between different events. Optional. */ | |
75 | int (*switch_events)(void); | |
1da177e4 LT |
76 | /* CPU identification string. */ |
77 | char * cpu_type; | |
78 | }; | |
79 | ||
80 | /** | |
81 | * One-time initialisation. *ops must be set to a filled-in | |
82 | * operations structure. This is called even in timer interrupt | |
83 | * mode so an arch can set a backtrace callback. | |
84 | * | |
85 | * If an error occurs, the fields should be left untouched. | |
86 | */ | |
87 | int oprofile_arch_init(struct oprofile_operations * ops); | |
88 | ||
89 | /** | |
90 | * One-time exit/cleanup for the arch. | |
91 | */ | |
92 | void oprofile_arch_exit(void); | |
93 | ||
94 | /** | |
58494487 | 95 | * Add a sample. This may be called from any context. |
1da177e4 LT |
96 | */ |
97 | void oprofile_add_sample(struct pt_regs * const regs, unsigned long event); | |
98 | ||
27357716 BR |
99 | /** |
100 | * Add an extended sample. Use this when the PC is not from the regs, and | |
101 | * we cannot determine if we're in kernel mode from the regs. | |
102 | * | |
103 | * This function does perform a backtrace. | |
104 | * | |
105 | */ | |
106 | void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs, | |
107 | unsigned long event, int is_kernel); | |
108 | ||
54ebbe7b HG |
109 | /** |
110 | * Add an hardware sample. | |
111 | */ | |
112 | void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs, | |
113 | unsigned long event, int is_kernel, | |
114 | struct task_struct *task); | |
115 | ||
1da177e4 LT |
116 | /* Use this instead when the PC value is not from the regs. Doesn't |
117 | * backtrace. */ | |
118 | void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event); | |
119 | ||
120 | /* add a backtrace entry, to be called from the ->backtrace callback */ | |
121 | void oprofile_add_trace(unsigned long eip); | |
122 | ||
123 | ||
124 | /** | |
125 | * Create a file of the given name as a child of the given root, with | |
126 | * the specified file operations. | |
127 | */ | |
128 | int oprofilefs_create_file(struct super_block * sb, struct dentry * root, | |
99ac48f5 | 129 | char const * name, const struct file_operations * fops); |
1da177e4 LT |
130 | |
131 | int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root, | |
99ac48f5 | 132 | char const * name, const struct file_operations * fops, int perm); |
1da177e4 LT |
133 | |
134 | /** Create a file for read/write access to an unsigned long. */ | |
135 | int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root, | |
136 | char const * name, ulong * val); | |
137 | ||
138 | /** Create a file for read-only access to an unsigned long. */ | |
139 | int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root, | |
140 | char const * name, ulong * val); | |
141 | ||
142 | /** Create a file for read-only access to an atomic_t. */ | |
143 | int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root, | |
144 | char const * name, atomic_t * val); | |
145 | ||
146 | /** create a directory */ | |
147 | struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root, | |
148 | char const * name); | |
149 | ||
150 | /** | |
151 | * Write the given asciz string to the given user buffer @buf, updating *offset | |
152 | * appropriately. Returns bytes written or -EFAULT. | |
153 | */ | |
154 | ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset); | |
155 | ||
156 | /** | |
157 | * Convert an unsigned long value into ASCII and copy it to the user buffer @buf, | |
158 | * updating *offset appropriately. Returns bytes written or -EFAULT. | |
159 | */ | |
160 | ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset); | |
161 | ||
162 | /** | |
163 | * Read an ASCII string for a number from a userspace buffer and fill *val on success. | |
164 | * Returns 0 on success, < 0 on error. | |
165 | */ | |
166 | int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count); | |
167 | ||
168 | /** lock for read/write safety */ | |
2d21a29f | 169 | extern raw_spinlock_t oprofilefs_lock; |
a5598ca0 CL |
170 | |
171 | /** | |
172 | * Add the contents of a circular buffer to the event buffer. | |
173 | */ | |
174 | void oprofile_put_buff(unsigned long *buf, unsigned int start, | |
175 | unsigned int stop, unsigned int max); | |
176 | ||
177 | unsigned long oprofile_get_cpu_buffer_size(void); | |
178 | void oprofile_cpu_buffer_inc_smpl_lost(void); | |
1da177e4 | 179 | |
14f0ca8e RR |
180 | /* cpu buffer functions */ |
181 | ||
182 | struct op_sample; | |
183 | ||
184 | struct op_entry { | |
185 | struct ring_buffer_event *event; | |
186 | struct op_sample *sample; | |
14f0ca8e RR |
187 | unsigned long size; |
188 | unsigned long *data; | |
189 | }; | |
190 | ||
191 | void oprofile_write_reserve(struct op_entry *entry, | |
192 | struct pt_regs * const regs, | |
193 | unsigned long pc, int code, int size); | |
194 | int oprofile_add_data(struct op_entry *entry, unsigned long val); | |
51563a0e | 195 | int oprofile_add_data64(struct op_entry *entry, u64 val); |
14f0ca8e RR |
196 | int oprofile_write_commit(struct op_entry *entry); |
197 | ||
1ea1bdf7 | 198 | #ifdef CONFIG_HW_PERF_EVENTS |
3d90a007 | 199 | int __init oprofile_perf_init(struct oprofile_operations *ops); |
b3b3a9b6 | 200 | void oprofile_perf_exit(void); |
56946331 | 201 | char *op_name_from_perf_id(void); |
d14dd7e2 AK |
202 | #else |
203 | static inline int __init oprofile_perf_init(struct oprofile_operations *ops) | |
204 | { | |
205 | pr_info("oprofile: hardware counters not available\n"); | |
206 | return -ENODEV; | |
207 | } | |
208 | static inline void oprofile_perf_exit(void) { } | |
1ea1bdf7 | 209 | #endif /* CONFIG_HW_PERF_EVENTS */ |
56946331 | 210 | |
1da177e4 | 211 | #endif /* OPROFILE_H */ |