1/*
2 * Performance event support - s390 specific definitions.
3 *
4 * Copyright IBM Corp. 2009, 2013
5 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
6 *	      Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
7 */
8
9#ifndef _ASM_S390_PERF_EVENT_H
10#define _ASM_S390_PERF_EVENT_H
11
12#include <linux/perf_event.h>
13#include <linux/device.h>
14#include <asm/cpu_mf.h>
15
16/* Per-CPU flags for PMU states */
17#define PMU_F_RESERVED			0x1000
18#define PMU_F_ENABLED			0x2000
19#define PMU_F_IN_USE			0x4000
20#define PMU_F_ERR_IBE			0x0100
21#define PMU_F_ERR_LSDA			0x0200
22#define PMU_F_ERR_MASK			(PMU_F_ERR_IBE|PMU_F_ERR_LSDA)
23
24/* Perf defintions for PMU event attributes in sysfs */
25extern __init const struct attribute_group **cpumf_cf_event_group(void);
26extern ssize_t cpumf_events_sysfs_show(struct device *dev,
27				       struct device_attribute *attr,
28				       char *page);
29#define EVENT_VAR(_cat, _name)		event_attr_##_cat##_##_name
30#define EVENT_PTR(_cat, _name)		(&EVENT_VAR(_cat, _name).attr.attr)
31
32#define CPUMF_EVENT_ATTR(cat, name, id)			\
33	PMU_EVENT_ATTR(name, EVENT_VAR(cat, name), id, cpumf_events_sysfs_show)
34#define CPUMF_EVENT_PTR(cat, name)	EVENT_PTR(cat, name)
35
36
37/* Perf callbacks */
38struct pt_regs;
39extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
40extern unsigned long perf_misc_flags(struct pt_regs *regs);
41#define perf_misc_flags(regs) perf_misc_flags(regs)
42
43/* Perf pt_regs extension for sample-data-entry indicators */
44struct perf_sf_sde_regs {
45	unsigned char in_guest:1;	  /* guest sample */
46	unsigned long reserved:63;	  /* reserved */
47};
48
49/* Perf PMU definitions for the counter facility */
50#define PERF_CPUM_CF_MAX_CTR		256
51
52/* Perf PMU definitions for the sampling facility */
53#define PERF_CPUM_SF_MAX_CTR		2
54#define PERF_EVENT_CPUM_SF		0xB0000UL /* Event: Basic-sampling */
55#define PERF_EVENT_CPUM_SF_DIAG		0xBD000UL /* Event: Combined-sampling */
56#define PERF_CPUM_SF_BASIC_MODE		0x0001	  /* Basic-sampling flag */
57#define PERF_CPUM_SF_DIAG_MODE		0x0002	  /* Diagnostic-sampling flag */
58#define PERF_CPUM_SF_MODE_MASK		(PERF_CPUM_SF_BASIC_MODE| \
59					 PERF_CPUM_SF_DIAG_MODE)
60#define PERF_CPUM_SF_FULL_BLOCKS	0x0004	  /* Process full SDBs only */
61
62#define REG_NONE		0
63#define REG_OVERFLOW		1
64#define OVERFLOW_REG(hwc)	((hwc)->extra_reg.config)
65#define SFB_ALLOC_REG(hwc)	((hwc)->extra_reg.alloc)
66#define RAWSAMPLE_REG(hwc)	((hwc)->config)
67#define TEAR_REG(hwc)		((hwc)->last_tag)
68#define SAMPL_RATE(hwc)		((hwc)->event_base)
69#define SAMPL_FLAGS(hwc)	((hwc)->config_base)
70#define SAMPL_DIAG_MODE(hwc)	(SAMPL_FLAGS(hwc) & PERF_CPUM_SF_DIAG_MODE)
71#define SDB_FULL_BLOCKS(hwc)	(SAMPL_FLAGS(hwc) & PERF_CPUM_SF_FULL_BLOCKS)
72
73/* Structure for sampling data entries to be passed as perf raw sample data
74 * to user space.  Note that raw sample data must be aligned and, thus, might
75 * be padded with zeros.
76 */
77struct sf_raw_sample {
78#define SF_RAW_SAMPLE_BASIC	PERF_CPUM_SF_BASIC_MODE
79#define SF_RAW_SAMPLE_DIAG	PERF_CPUM_SF_DIAG_MODE
80	u64			format;
81	u32			 size;	  /* Size of sf_raw_sample */
82	u16			bsdes;	  /* Basic-sampling data entry size */
83	u16			dsdes;	  /* Diagnostic-sampling data entry size */
84	struct hws_basic_entry	basic;	  /* Basic-sampling data entry */
85	struct hws_diag_entry	 diag;	  /* Diagnostic-sampling data entry */
86	u8		    padding[];	  /* Padding to next multiple of 8 */
87} __packed;
88
89/* Perf hardware reserve and release functions */
90#ifdef CONFIG_PERF_EVENTS
91int perf_reserve_sampling(void);
92void perf_release_sampling(void);
93#else /* CONFIG_PERF_EVENTS */
94static inline int perf_reserve_sampling(void)
95{
96	return 0;
97}
98static inline void perf_release_sampling(void) {}
99#endif /* CONFIG_PERF_EVENTS */
100
101#endif /* _ASM_S390_PERF_EVENT_H */
102