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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 <linux/init.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/printk.h> | |
21 | #include <asm/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 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); | |
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 | ||
71 | /* Initiate a stack backtrace. Optional. */ | |
72 | void (*backtrace)(struct pt_regs * const regs, unsigned int depth); | |
73 | ||
74 | /* Multiplex between different events. Optional. */ | |
75 | int (*switch_events)(void); | |
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 | /** | |
95 | * Add a sample. This may be called from any context. | |
96 | */ | |
97 | void oprofile_add_sample(struct pt_regs * const regs, unsigned long event); | |
98 | ||
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 | ||
109 | /* Use this instead when the PC value is not from the regs. Doesn't | |
110 | * backtrace. */ | |
111 | void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event); | |
112 | ||
113 | /* add a backtrace entry, to be called from the ->backtrace callback */ | |
114 | void oprofile_add_trace(unsigned long eip); | |
115 | ||
116 | ||
117 | /** | |
118 | * Create a file of the given name as a child of the given root, with | |
119 | * the specified file operations. | |
120 | */ | |
121 | int oprofilefs_create_file(struct super_block * sb, struct dentry * root, | |
122 | char const * name, const struct file_operations * fops); | |
123 | ||
124 | int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root, | |
125 | char const * name, const struct file_operations * fops, int perm); | |
126 | ||
127 | /** Create a file for read/write access to an unsigned long. */ | |
128 | int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root, | |
129 | char const * name, ulong * val); | |
130 | ||
131 | /** Create a file for read-only access to an unsigned long. */ | |
132 | int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root, | |
133 | char const * name, ulong * val); | |
134 | ||
135 | /** Create a file for read-only access to an atomic_t. */ | |
136 | int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root, | |
137 | char const * name, atomic_t * val); | |
138 | ||
139 | /** create a directory */ | |
140 | struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root, | |
141 | char const * name); | |
142 | ||
143 | /** | |
144 | * Write the given asciz string to the given user buffer @buf, updating *offset | |
145 | * appropriately. Returns bytes written or -EFAULT. | |
146 | */ | |
147 | ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset); | |
148 | ||
149 | /** | |
150 | * Convert an unsigned long value into ASCII and copy it to the user buffer @buf, | |
151 | * updating *offset appropriately. Returns bytes written or -EFAULT. | |
152 | */ | |
153 | ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset); | |
154 | ||
155 | /** | |
156 | * Read an ASCII string for a number from a userspace buffer and fill *val on success. | |
157 | * Returns 0 on success, < 0 on error. | |
158 | */ | |
159 | int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count); | |
160 | ||
161 | /** lock for read/write safety */ | |
162 | extern spinlock_t oprofilefs_lock; | |
163 | ||
164 | /** | |
165 | * Add the contents of a circular buffer to the event buffer. | |
166 | */ | |
167 | void oprofile_put_buff(unsigned long *buf, unsigned int start, | |
168 | unsigned int stop, unsigned int max); | |
169 | ||
170 | unsigned long oprofile_get_cpu_buffer_size(void); | |
171 | void oprofile_cpu_buffer_inc_smpl_lost(void); | |
172 | ||
173 | /* cpu buffer functions */ | |
174 | ||
175 | struct op_sample; | |
176 | ||
177 | struct op_entry { | |
178 | struct ring_buffer_event *event; | |
179 | struct op_sample *sample; | |
180 | unsigned long size; | |
181 | unsigned long *data; | |
182 | }; | |
183 | ||
184 | void oprofile_write_reserve(struct op_entry *entry, | |
185 | struct pt_regs * const regs, | |
186 | unsigned long pc, int code, int size); | |
187 | int oprofile_add_data(struct op_entry *entry, unsigned long val); | |
188 | int oprofile_add_data64(struct op_entry *entry, u64 val); | |
189 | int oprofile_write_commit(struct op_entry *entry); | |
190 | ||
191 | #ifdef CONFIG_HW_PERF_EVENTS | |
192 | int __init oprofile_perf_init(struct oprofile_operations *ops); | |
193 | void oprofile_perf_exit(void); | |
194 | char *op_name_from_perf_id(void); | |
195 | #else | |
196 | static inline int __init oprofile_perf_init(struct oprofile_operations *ops) | |
197 | { | |
198 | pr_info("oprofile: hardware counters not available\n"); | |
199 | return -ENODEV; | |
200 | } | |
201 | static inline void oprofile_perf_exit(void) { } | |
202 | #endif /* CONFIG_HW_PERF_EVENTS */ | |
203 | ||
204 | #endif /* OPROFILE_H */ |