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>
22 struct file_operations;
25 /* Operations structure to be filled in */
26 struct oprofile_operations {
27 /* create any necessary configuration files in the oprofile fs.
29 int (*create_files)(struct super_block * sb, struct dentry * root);
30 /* Do any necessary interrupt setup. Optional. */
32 /* Do any necessary interrupt shutdown. Optional. */
33 void (*shutdown)(void);
34 /* Start delivering interrupts. */
36 /* Stop delivering interrupts. */
38 /* Initiate a stack backtrace. Optional. */
39 void (*backtrace)(struct pt_regs * const regs, unsigned int depth);
40 /* CPU identification string. */
45 * One-time initialisation. *ops must be set to a filled-in
46 * operations structure. This is called even in timer interrupt
47 * mode so an arch can set a backtrace callback.
49 * If an error occurs, the fields should be left untouched.
51 int oprofile_arch_init(struct oprofile_operations * ops);
54 * One-time exit/cleanup for the arch.
56 void oprofile_arch_exit(void);
59 * Add a sample. This may be called from any context. Pass
60 * smp_processor_id() as cpu.
62 void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
64 /* Use this instead when the PC value is not from the regs. Doesn't
66 void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);
68 /* add a backtrace entry, to be called from the ->backtrace callback */
69 void oprofile_add_trace(unsigned long eip);
73 * Create a file of the given name as a child of the given root, with
74 * the specified file operations.
76 int oprofilefs_create_file(struct super_block * sb, struct dentry * root,
77 char const * name, struct file_operations * fops);
79 int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root,
80 char const * name, struct file_operations * fops, int perm);
82 /** Create a file for read/write access to an unsigned long. */
83 int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root,
84 char const * name, ulong * val);
86 /** Create a file for read-only access to an unsigned long. */
87 int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root,
88 char const * name, ulong * val);
90 /** Create a file for read-only access to an atomic_t. */
91 int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root,
92 char const * name, atomic_t * val);
94 /** create a directory */
95 struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root,
99 * Write the given asciz string to the given user buffer @buf, updating *offset
100 * appropriately. Returns bytes written or -EFAULT.
102 ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset);
105 * Convert an unsigned long value into ASCII and copy it to the user buffer @buf,
106 * updating *offset appropriately. Returns bytes written or -EFAULT.
108 ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset);
111 * Read an ASCII string for a number from a userspace buffer and fill *val on success.
112 * Returns 0 on success, < 0 on error.
114 int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);
116 /** lock for read/write safety */
117 extern spinlock_t oprofilefs_lock;
119 #endif /* OPROFILE_H */