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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> |
1da177e4 LT |
19 | #include <asm/atomic.h> |
20 | ||
1474855d BN |
21 | /* Each escaped entry is prefixed by ESCAPE_CODE |
22 | * then one of the following codes, then the | |
23 | * relevant data. | |
24 | * These #defines live in this file so that arch-specific | |
25 | * buffer sync'ing code can access them. | |
26 | */ | |
27 | #define ESCAPE_CODE ~0UL | |
28 | #define CTX_SWITCH_CODE 1 | |
29 | #define CPU_SWITCH_CODE 2 | |
30 | #define COOKIE_SWITCH_CODE 3 | |
31 | #define KERNEL_ENTER_SWITCH_CODE 4 | |
32 | #define KERNEL_EXIT_SWITCH_CODE 5 | |
33 | #define MODULE_LOADED_CODE 6 | |
34 | #define CTX_TGID_CODE 7 | |
35 | #define TRACE_BEGIN_CODE 8 | |
36 | #define TRACE_END_CODE 9 | |
37 | #define XEN_ENTER_SWITCH_CODE 10 | |
38 | #define SPU_PROFILING_CODE 11 | |
39 | #define SPU_CTX_SWITCH_CODE 12 | |
ee648bc7 RR |
40 | #define IBS_FETCH_CODE 13 |
41 | #define IBS_OP_CODE 14 | |
1474855d | 42 | |
1da177e4 LT |
43 | struct super_block; |
44 | struct dentry; | |
45 | struct file_operations; | |
46 | struct pt_regs; | |
47 | ||
48 | /* Operations structure to be filled in */ | |
49 | struct oprofile_operations { | |
50 | /* create any necessary configuration files in the oprofile fs. | |
51 | * Optional. */ | |
52 | int (*create_files)(struct super_block * sb, struct dentry * root); | |
53 | /* Do any necessary interrupt setup. Optional. */ | |
54 | int (*setup)(void); | |
55 | /* Do any necessary interrupt shutdown. Optional. */ | |
56 | void (*shutdown)(void); | |
57 | /* Start delivering interrupts. */ | |
58 | int (*start)(void); | |
59 | /* Stop delivering interrupts. */ | |
60 | void (*stop)(void); | |
1474855d BN |
61 | /* Arch-specific buffer sync functions. |
62 | * Return value = 0: Success | |
63 | * Return value = -1: Failure | |
64 | * Return value = 1: Run generic sync function | |
65 | */ | |
66 | int (*sync_start)(void); | |
67 | int (*sync_stop)(void); | |
68 | ||
1da177e4 LT |
69 | /* Initiate a stack backtrace. Optional. */ |
70 | void (*backtrace)(struct pt_regs * const regs, unsigned int depth); | |
4d4036e0 JY |
71 | |
72 | /* Multiplex between different events. Optional. */ | |
73 | int (*switch_events)(void); | |
1da177e4 LT |
74 | /* CPU identification string. */ |
75 | char * cpu_type; | |
76 | }; | |
77 | ||
78 | /** | |
79 | * One-time initialisation. *ops must be set to a filled-in | |
80 | * operations structure. This is called even in timer interrupt | |
81 | * mode so an arch can set a backtrace callback. | |
82 | * | |
83 | * If an error occurs, the fields should be left untouched. | |
84 | */ | |
85 | int oprofile_arch_init(struct oprofile_operations * ops); | |
86 | ||
87 | /** | |
88 | * One-time exit/cleanup for the arch. | |
89 | */ | |
90 | void oprofile_arch_exit(void); | |
91 | ||
92 | /** | |
58494487 | 93 | * Add a sample. This may be called from any context. |
1da177e4 LT |
94 | */ |
95 | void oprofile_add_sample(struct pt_regs * const regs, unsigned long event); | |
96 | ||
27357716 BR |
97 | /** |
98 | * Add an extended sample. Use this when the PC is not from the regs, and | |
99 | * we cannot determine if we're in kernel mode from the regs. | |
100 | * | |
101 | * This function does perform a backtrace. | |
102 | * | |
103 | */ | |
104 | void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs, | |
105 | unsigned long event, int is_kernel); | |
106 | ||
1da177e4 LT |
107 | /* Use this instead when the PC value is not from the regs. Doesn't |
108 | * backtrace. */ | |
109 | void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event); | |
110 | ||
111 | /* add a backtrace entry, to be called from the ->backtrace callback */ | |
112 | void oprofile_add_trace(unsigned long eip); | |
113 | ||
114 | ||
115 | /** | |
116 | * Create a file of the given name as a child of the given root, with | |
117 | * the specified file operations. | |
118 | */ | |
119 | int oprofilefs_create_file(struct super_block * sb, struct dentry * root, | |
99ac48f5 | 120 | char const * name, const struct file_operations * fops); |
1da177e4 LT |
121 | |
122 | int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root, | |
99ac48f5 | 123 | char const * name, const struct file_operations * fops, int perm); |
1da177e4 LT |
124 | |
125 | /** Create a file for read/write access to an unsigned long. */ | |
126 | int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root, | |
127 | char const * name, ulong * val); | |
128 | ||
129 | /** Create a file for read-only access to an unsigned long. */ | |
130 | int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root, | |
131 | char const * name, ulong * val); | |
132 | ||
133 | /** Create a file for read-only access to an atomic_t. */ | |
134 | int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root, | |
135 | char const * name, atomic_t * val); | |
136 | ||
137 | /** create a directory */ | |
138 | struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root, | |
139 | char const * name); | |
140 | ||
141 | /** | |
142 | * Write the given asciz string to the given user buffer @buf, updating *offset | |
143 | * appropriately. Returns bytes written or -EFAULT. | |
144 | */ | |
145 | ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset); | |
146 | ||
147 | /** | |
148 | * Convert an unsigned long value into ASCII and copy it to the user buffer @buf, | |
149 | * updating *offset appropriately. Returns bytes written or -EFAULT. | |
150 | */ | |
151 | ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset); | |
152 | ||
153 | /** | |
154 | * Read an ASCII string for a number from a userspace buffer and fill *val on success. | |
155 | * Returns 0 on success, < 0 on error. | |
156 | */ | |
157 | int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count); | |
158 | ||
159 | /** lock for read/write safety */ | |
160 | extern spinlock_t oprofilefs_lock; | |
a5598ca0 CL |
161 | |
162 | /** | |
163 | * Add the contents of a circular buffer to the event buffer. | |
164 | */ | |
165 | void oprofile_put_buff(unsigned long *buf, unsigned int start, | |
166 | unsigned int stop, unsigned int max); | |
167 | ||
168 | unsigned long oprofile_get_cpu_buffer_size(void); | |
169 | void oprofile_cpu_buffer_inc_smpl_lost(void); | |
1da177e4 | 170 | |
14f0ca8e RR |
171 | /* cpu buffer functions */ |
172 | ||
173 | struct op_sample; | |
174 | ||
175 | struct op_entry { | |
176 | struct ring_buffer_event *event; | |
177 | struct op_sample *sample; | |
14f0ca8e RR |
178 | unsigned long size; |
179 | unsigned long *data; | |
180 | }; | |
181 | ||
182 | void oprofile_write_reserve(struct op_entry *entry, | |
183 | struct pt_regs * const regs, | |
184 | unsigned long pc, int code, int size); | |
185 | int oprofile_add_data(struct op_entry *entry, unsigned long val); | |
51563a0e | 186 | int oprofile_add_data64(struct op_entry *entry, u64 val); |
14f0ca8e RR |
187 | int oprofile_write_commit(struct op_entry *entry); |
188 | ||
56946331 | 189 | #ifdef CONFIG_PERF_EVENTS |
3d90a007 | 190 | int __init oprofile_perf_init(struct oprofile_operations *ops); |
b3b3a9b6 | 191 | void oprofile_perf_exit(void); |
56946331 MF |
192 | char *op_name_from_perf_id(void); |
193 | #endif /* CONFIG_PERF_EVENTS */ | |
194 | ||
1da177e4 | 195 | #endif /* OPROFILE_H */ |