e6ae5d9540
Support BTS recording of 32bit and 64bit tasks from 32bit or 64bit tasks. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/*
|
|
* Debug Store (DS) support
|
|
*
|
|
* This provides a low-level interface to the hardware's Debug Store
|
|
* feature that is used for last branch recording (LBR) and
|
|
* precise-event based sampling (PEBS).
|
|
*
|
|
* Different architectures use a different DS layout/pointer size.
|
|
* The below functions therefore work on a void*.
|
|
*
|
|
*
|
|
* Since there is no user for PEBS, yet, only LBR (or branch
|
|
* trace store, BTS) is supported.
|
|
*
|
|
*
|
|
* Copyright (C) 2007 Intel Corporation.
|
|
* Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
|
|
*/
|
|
|
|
#ifndef _ASM_X86_DS_H
|
|
#define _ASM_X86_DS_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
|
|
struct cpuinfo_x86;
|
|
|
|
|
|
/* a branch trace record entry
|
|
*
|
|
* In order to unify the interface between various processor versions,
|
|
* we use the below data structure for all processors.
|
|
*/
|
|
enum bts_qualifier {
|
|
BTS_INVALID = 0,
|
|
BTS_BRANCH,
|
|
BTS_TASK_ARRIVES,
|
|
BTS_TASK_DEPARTS
|
|
};
|
|
|
|
struct bts_struct {
|
|
u64 qualifier;
|
|
union {
|
|
/* BTS_BRANCH */
|
|
struct {
|
|
u64 from_ip;
|
|
u64 to_ip;
|
|
} lbr;
|
|
/* BTS_TASK_ARRIVES or
|
|
BTS_TASK_DEPARTS */
|
|
u64 jiffies;
|
|
} variant;
|
|
};
|
|
|
|
/* Overflow handling mechanisms */
|
|
#define DS_O_SIGNAL 1 /* send overflow signal */
|
|
#define DS_O_WRAP 2 /* wrap around */
|
|
|
|
extern int ds_allocate(void **, size_t);
|
|
extern int ds_free(void **);
|
|
extern int ds_get_bts_size(void *);
|
|
extern int ds_get_bts_end(void *);
|
|
extern int ds_get_bts_index(void *);
|
|
extern int ds_set_overflow(void *, int);
|
|
extern int ds_get_overflow(void *);
|
|
extern int ds_clear(void *);
|
|
extern int ds_read_bts(void *, int, struct bts_struct *);
|
|
extern int ds_write_bts(void *, const struct bts_struct *);
|
|
extern unsigned long ds_debugctl_mask(void);
|
|
extern void __cpuinit ds_init_intel(struct cpuinfo_x86 *c);
|
|
|
|
#endif /* _ASM_X86_DS_H */
|