/** * @file cpu_buffer.h * * @remark Copyright 2002-2009 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> * @author Robert Richter <robert.richter@amd.com> */ #ifndef OPROFILE_CPU_BUFFER_H#define OPROFILE_CPU_BUFFER_H #include <linux/types.h>#include <linux/spinlock.h>#include <linux/workqueue.h>#include <linux/cache.h>#include <linux/sched.h>#include <linux/ring_buffer.h> struct task_struct; int alloc_cpu_buffers(void);void free_cpu_buffers(void); void start_cpu_work(void);void end_cpu_work(void);void flush_cpu_work(void); /* CPU buffer is composed of such entries (which are * also used for context switch notes) */struct op_sample {	unsigned long eip;	unsigned long event;	unsigned long data[0];}; struct op_entry; struct oprofile_cpu_buffer {	unsigned long buffer_size;	struct task_struct *last_task;	int last_is_kernel;	int tracing;	unsigned long sample_received;	unsigned long sample_lost_overflow;	unsigned long backtrace_aborted;	unsigned long sample_invalid_eip;	int cpu;	struct delayed_work work;}; DECLARE_PER_CPU(struct oprofile_cpu_buffer, op_cpu_buffer); /* * Resets the cpu buffer to a sane state. * * reset these to invalid values; the next sample collected will * populate the buffer with proper values to initialize the buffer */static inline void op_cpu_buffer_reset(int cpu){	struct oprofile_cpu_buffer *cpu_buf = &per_cpu(op_cpu_buffer, cpu); 	cpu_buf->last_is_kernel = -1;	cpu_buf->last_task = NULL;} /* * op_cpu_buffer_add_data() and op_cpu_buffer_write_commit() may be * called only if op_cpu_buffer_write_reserve() did not return NULL or * entry->event != NULL, otherwise entry->size or entry->event will be * used uninitialized. */ struct op_sample*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);int op_cpu_buffer_write_commit(struct op_entry *entry);struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu);unsigned long op_cpu_buffer_entries(int cpu); /* returns the remaining free size of data in the entry */static inlineint op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val){	if (!entry->size)		return 0;	*entry->data = val;	entry->size--;	entry->data++;	return entry->size;} /* returns the size of data in the entry */static inlineint op_cpu_buffer_get_size(struct op_entry *entry){	return entry->size;} /* returns 0 if empty or the size of data including the current value */static inlineint op_cpu_buffer_get_data(struct op_entry *entry, unsigned long *val){	int size = entry->size;	if (!size)		return 0;	*val = *entry->data;	entry->size--;	entry->data++;	return size;} /* extra data flags */#define KERNEL_CTX_SWITCH	(1UL << 0)#define IS_KERNEL		(1UL << 1)#define TRACE_BEGIN		(1UL << 2)#define USER_CTX_SWITCH		(1UL << 3) #endif /* OPROFILE_CPU_BUFFER_H */