xref: /openbmc/linux/arch/x86/events/intel/pt.h (revision 8f5f3db3)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Intel(R) Processor Trace PMU driver for perf
4  * Copyright (c) 2013-2014, Intel Corporation.
5  *
6  * Intel PT is specified in the Intel Architecture Instruction Set Extensions
7  * Programming Reference:
8  * http://software.intel.com/en-us/intel-isa-extensions
9  */
10 
11 #ifndef __INTEL_PT_H__
12 #define __INTEL_PT_H__
13 
14 /*
15  * Single-entry ToPA: when this close to region boundary, switch
16  * buffers to avoid losing data.
17  */
18 #define TOPA_PMI_MARGIN 512
19 
20 #define TOPA_SHIFT 12
21 
sizes(unsigned int tsz)22 static inline unsigned int sizes(unsigned int tsz)
23 {
24 	return 1 << (tsz + TOPA_SHIFT);
25 };
26 
27 struct topa_entry {
28 	u64	end	: 1;
29 	u64	rsvd0	: 1;
30 	u64	intr	: 1;
31 	u64	rsvd1	: 1;
32 	u64	stop	: 1;
33 	u64	rsvd2	: 1;
34 	u64	size	: 4;
35 	u64	rsvd3	: 2;
36 	u64	base	: 40;
37 	u64	rsvd4	: 12;
38 };
39 
40 /* TSC to Core Crystal Clock Ratio */
41 #define CPUID_TSC_LEAF		0x15
42 
43 struct pt_pmu {
44 	struct pmu		pmu;
45 	u32			caps[PT_CPUID_REGS_NUM * PT_CPUID_LEAVES];
46 	bool			vmx;
47 	bool			branch_en_always_on;
48 	unsigned long		max_nonturbo_ratio;
49 	unsigned int		tsc_art_num;
50 	unsigned int		tsc_art_den;
51 };
52 
53 /**
54  * struct pt_buffer - buffer configuration; one buffer per task_struct or
55  *		cpu, depending on perf event configuration
56  * @tables:	list of ToPA tables in this buffer
57  * @first:	shorthand for first topa table
58  * @last:	shorthand for last topa table
59  * @cur:	current topa table
60  * @nr_pages:	buffer size in pages
61  * @cur_idx:	current output region's index within @cur table
62  * @output_off:	offset within the current output region
63  * @data_size:	running total of the amount of data in this buffer
64  * @lost:	if data was lost/truncated
65  * @head:	logical write offset inside the buffer
66  * @snapshot:	if this is for a snapshot/overwrite counter
67  * @single:	use Single Range Output instead of ToPA
68  * @stop_pos:	STOP topa entry index
69  * @intr_pos:	INT topa entry index
70  * @stop_te:	STOP topa entry pointer
71  * @intr_te:	INT topa entry pointer
72  * @data_pages:	array of pages from perf
73  * @topa_index:	table of topa entries indexed by page offset
74  */
75 struct pt_buffer {
76 	struct list_head	tables;
77 	struct topa		*first, *last, *cur;
78 	unsigned int		cur_idx;
79 	size_t			output_off;
80 	unsigned long		nr_pages;
81 	local_t			data_size;
82 	local64_t		head;
83 	bool			snapshot;
84 	bool			single;
85 	long			stop_pos, intr_pos;
86 	struct topa_entry	*stop_te, *intr_te;
87 	void			**data_pages;
88 };
89 
90 #define PT_FILTERS_NUM	4
91 
92 /**
93  * struct pt_filter - IP range filter configuration
94  * @msr_a:	range start, goes to RTIT_ADDRn_A
95  * @msr_b:	range end, goes to RTIT_ADDRn_B
96  * @config:	4-bit field in RTIT_CTL
97  */
98 struct pt_filter {
99 	unsigned long	msr_a;
100 	unsigned long	msr_b;
101 	unsigned long	config;
102 };
103 
104 /**
105  * struct pt_filters - IP range filtering context
106  * @filter:	filters defined for this context
107  * @nr_filters:	number of defined filters in the @filter array
108  */
109 struct pt_filters {
110 	struct pt_filter	filter[PT_FILTERS_NUM];
111 	unsigned int		nr_filters;
112 };
113 
114 /**
115  * struct pt - per-cpu pt context
116  * @handle:		perf output handle
117  * @filters:		last configured filters
118  * @handle_nmi:		do handle PT PMI on this cpu, there's an active event
119  * @vmx_on:		1 if VMX is ON on this cpu
120  * @output_base:	cached RTIT_OUTPUT_BASE MSR value
121  * @output_mask:	cached RTIT_OUTPUT_MASK MSR value
122  */
123 struct pt {
124 	struct perf_output_handle handle;
125 	struct pt_filters	filters;
126 	int			handle_nmi;
127 	int			vmx_on;
128 	u64			output_base;
129 	u64			output_mask;
130 };
131 
132 #endif /* __INTEL_PT_H__ */
133