4 * API for machine-specific interrupts to interface
7 * @remark Copyright 2002 OProfile authors
8 * @remark Read the file COPYING
10 * @author John Levon <levon@movementarian.org>
16 #include <linux/types.h>
17 #include <linux/spinlock.h>
18 #include <asm/atomic.h>
20 /* Each escaped entry is prefixed by ESCAPE_CODE
21 * then one of the following codes, then the
23 * These #defines live in this file so that arch-specific
24 * buffer sync'ing code can access them.
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
44 struct file_operations;
47 /* Operations structure to be filled in */
48 struct oprofile_operations {
49 /* create any necessary configuration files in the oprofile fs.
51 int (*create_files)(struct super_block * sb, struct dentry * root);
52 /* Do any necessary interrupt setup. Optional. */
54 /* Do any necessary interrupt shutdown. Optional. */
55 void (*shutdown)(void);
56 /* Start delivering interrupts. */
58 /* Stop delivering interrupts. */
60 /* Arch-specific buffer sync functions.
61 * Return value = 0: Success
62 * Return value = -1: Failure
63 * Return value = 1: Run generic sync function
65 int (*sync_start)(void);
66 int (*sync_stop)(void);
68 /* Initiate a stack backtrace. Optional. */
69 void (*backtrace)(struct pt_regs * const regs, unsigned int depth);
71 /* Multiplex between different events. Optional. */
72 int (*switch_events)(void);
73 /* CPU identification string. */
78 * One-time initialisation. *ops must be set to a filled-in
79 * operations structure. This is called even in timer interrupt
80 * mode so an arch can set a backtrace callback.
82 * If an error occurs, the fields should be left untouched.
84 int oprofile_arch_init(struct oprofile_operations * ops);
87 * One-time exit/cleanup for the arch.
89 void oprofile_arch_exit(void);
92 * Add data to the event buffer.
93 * The data passed is free-form, but typically consists of
94 * file offsets, dcookies, context information, and ESCAPE codes.
96 void add_event_entry(unsigned long data);
99 * Add a sample. This may be called from any context. Pass
100 * smp_processor_id() as cpu.
102 void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
105 * Add an extended sample. Use this when the PC is not from the regs, and
106 * we cannot determine if we're in kernel mode from the regs.
108 * This function does perform a backtrace.
111 void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
112 unsigned long event, int is_kernel);
114 /* Use this instead when the PC value is not from the regs. Doesn't
116 void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);
118 /* add a backtrace entry, to be called from the ->backtrace callback */
119 void oprofile_add_trace(unsigned long eip);
123 * Create a file of the given name as a child of the given root, with
124 * the specified file operations.
126 int oprofilefs_create_file(struct super_block * sb, struct dentry * root,
127 char const * name, const struct file_operations * fops);
129 int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root,
130 char const * name, const struct file_operations * fops, int perm);
132 /** Create a file for read/write access to an unsigned long. */
133 int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root,
134 char const * name, ulong * val);
136 /** Create a file for read-only access to an unsigned long. */
137 int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root,
138 char const * name, ulong * val);
140 /** Create a file for read-only access to an atomic_t. */
141 int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root,
142 char const * name, atomic_t * val);
144 /** create a directory */
145 struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root,
149 * Write the given asciz string to the given user buffer @buf, updating *offset
150 * appropriately. Returns bytes written or -EFAULT.
152 ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset);
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.
158 ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset);
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.
164 int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);
166 /** lock for read/write safety */
167 extern spinlock_t oprofilefs_lock;
169 #endif /* OPROFILE_H */