drivers/oprofile/cpu_buffer.h

   1 /**
   2  * @file cpu_buffer.h
   3  *
   4  * @remark Copyright 2002 OProfile authors
   5  * @remark Read the file COPYING
   6  *
   7  * @author John Levon <levon@movementarian.org>
   8  */
   9
  10 #ifndef OPROFILE_CPU_BUFFER_H
  11 #define OPROFILE_CPU_BUFFER_H
  12
  13 #include <linux/types.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/cache.h>
  17 #include <linux/sched.h>
  18 #include <linux/ring_buffer.h>
  19
  20 struct task_struct;
  21
  22 int alloc_cpu_buffers(void);
  23 void free_cpu_buffers(void);
  24
  25 void start_cpu_work(void);
  26 void end_cpu_work(void);
  27
  28 /* CPU buffer is composed of such entries (which are
  29  * also used for context switch notes)
  30  */
  31 struct op_sample {
  32         unsigned long eip;
  33         unsigned long event;
  34 };
  35
  36 struct op_entry {
  37         struct ring_buffer_event *event;
  38         struct op_sample *sample;
  39         unsigned long irq_flags;
  40 };
  41
  42 struct oprofile_cpu_buffer {
  43         unsigned long buffer_size;
  44         struct task_struct *last_task;
  45         int last_is_kernel;
  46         int tracing;
  47         unsigned long sample_received;
  48         unsigned long sample_lost_overflow;
  49         unsigned long backtrace_aborted;
  50         unsigned long sample_invalid_eip;
  51         int cpu;
  52         struct delayed_work work;
  53 };
  54
  55 DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
  56
  57 /*
  58  * Resets the cpu buffer to a sane state.
  59  *
  60  * reset these to invalid values; the next sample collected will
  61  * populate the buffer with proper values to initialize the buffer
  62  */
  63 static inline void op_cpu_buffer_reset(int cpu)
  64 {
  65         struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
  66
  67         cpu_buf->last_is_kernel = -1;
  68         cpu_buf->last_task = NULL;
  69 }
  70
  71 int op_cpu_buffer_write_entry(struct op_entry *entry);
  72 int op_cpu_buffer_write_commit(struct op_entry *entry);
  73 struct op_sample *op_cpu_buffer_read_entry(int cpu);
  74 unsigned long op_cpu_buffer_entries(int cpu);
  75
  76 /* transient events for the CPU buffer -> event buffer */
  77 #define CPU_IS_KERNEL 1
  78 #define CPU_TRACE_BEGIN 2
  79 #define IBS_FETCH_BEGIN 3
  80 #define IBS_OP_BEGIN    4
  81
  82 #endif /* OPROFILE_CPU_BUFFER_H */