1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * This contains all required hardware related helper functions for
4 * Trace Buffer Extension (TRBE) driver in the coresight framework.
5 *
6 * Copyright (C) 2020 ARM Ltd.
7 *
8 * Author: Anshuman Khandual <anshuman.khandual@arm.com>
9 */
10#include <linux/acpi.h>
11#include <linux/coresight.h>
12#include <linux/device.h>
13#include <linux/irq.h>
14#include <linux/kernel.h>
15#include <linux/of.h>
16#include <linux/perf/arm_pmu.h>
17#include <linux/platform_device.h>
18#include <linux/smp.h>
19
20#include "coresight-etm-perf.h"
21
22static inline bool is_trbe_available(void)
23{
24 u64 aa64dfr0 = read_sysreg_s(SYS_ID_AA64DFR0_EL1);
25 unsigned int trbe = cpuid_feature_extract_unsigned_field(aa64dfr0,
26 ID_AA64DFR0_EL1_TraceBuffer_SHIFT);
27
28 return trbe >= ID_AA64DFR0_EL1_TraceBuffer_IMP;
29}
30
31static inline bool is_trbe_enabled(void)
32{
33 u64 trblimitr = read_sysreg_s(SYS_TRBLIMITR_EL1);
34
35 return trblimitr & TRBLIMITR_EL1_E;
36}
37
38#define TRBE_EC_OTHERS 0
39#define TRBE_EC_STAGE1_ABORT 36
40#define TRBE_EC_STAGE2_ABORT 37
41
42static inline int get_trbe_ec(u64 trbsr)
43{
44 return (trbsr & TRBSR_EL1_EC_MASK) >> TRBSR_EL1_EC_SHIFT;
45}
46
47#define TRBE_BSC_NOT_STOPPED 0
48#define TRBE_BSC_FILLED 1
49#define TRBE_BSC_TRIGGERED 2
50
51static inline int get_trbe_bsc(u64 trbsr)
52{
53 return (trbsr & TRBSR_EL1_BSC_MASK) >> TRBSR_EL1_BSC_SHIFT;
54}
55
56static inline void clr_trbe_irq(void)
57{
58 u64 trbsr = read_sysreg_s(SYS_TRBSR_EL1);
59
60 trbsr &= ~TRBSR_EL1_IRQ;
61 write_sysreg_s(trbsr, SYS_TRBSR_EL1);
62}
63
64static inline bool is_trbe_irq(u64 trbsr)
65{
66 return trbsr & TRBSR_EL1_IRQ;
67}
68
69static inline bool is_trbe_trg(u64 trbsr)
70{
71 return trbsr & TRBSR_EL1_TRG;
72}
73
74static inline bool is_trbe_wrap(u64 trbsr)
75{
76 return trbsr & TRBSR_EL1_WRAP;
77}
78
79static inline bool is_trbe_abort(u64 trbsr)
80{
81 return trbsr & TRBSR_EL1_EA;
82}
83
84static inline bool is_trbe_running(u64 trbsr)
85{
86 return !(trbsr & TRBSR_EL1_S);
87}
88
89static inline bool get_trbe_flag_update(u64 trbidr)
90{
91 return trbidr & TRBIDR_EL1_F;
92}
93
94static inline bool is_trbe_programmable(u64 trbidr)
95{
96 return !(trbidr & TRBIDR_EL1_P);
97}
98
99static inline int get_trbe_address_align(u64 trbidr)
100{
101 return (trbidr & TRBIDR_EL1_Align_MASK) >> TRBIDR_EL1_Align_SHIFT;
102}
103
104static inline unsigned long get_trbe_write_pointer(void)
105{
106 return read_sysreg_s(SYS_TRBPTR_EL1);
107}
108
109static inline void set_trbe_write_pointer(unsigned long addr)
110{
111 WARN_ON(is_trbe_enabled());
112 write_sysreg_s(addr, SYS_TRBPTR_EL1);
113}
114
115static inline unsigned long get_trbe_limit_pointer(void)
116{
117 u64 trblimitr = read_sysreg_s(SYS_TRBLIMITR_EL1);
118 unsigned long addr = trblimitr & TRBLIMITR_EL1_LIMIT_MASK;
119
120 WARN_ON(!IS_ALIGNED(addr, PAGE_SIZE));
121 return addr;
122}
123
124static inline unsigned long get_trbe_base_pointer(void)
125{
126 u64 trbbaser = read_sysreg_s(SYS_TRBBASER_EL1);
127 unsigned long addr = trbbaser & TRBBASER_EL1_BASE_MASK;
128
129 WARN_ON(!IS_ALIGNED(addr, PAGE_SIZE));
130 return addr;
131}
132
133static inline void set_trbe_base_pointer(unsigned long addr)
134{
135 WARN_ON(is_trbe_enabled());
136 WARN_ON(!IS_ALIGNED(addr, (1UL << TRBBASER_EL1_BASE_SHIFT)));
137 WARN_ON(!IS_ALIGNED(addr, PAGE_SIZE));
138 write_sysreg_s(addr, SYS_TRBBASER_EL1);
139}
140

source code of linux/drivers/hwtracing/coresight/coresight-trbe.h