1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Performance events support for SH7750-style performance counters
4 *
5 * Copyright (C) 2009 Paul Mundt
6 */
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <linux/io.h>
10 #include <linux/irq.h>
11 #include <linux/perf_event.h>
12 #include <asm/processor.h>
13
14 #define PM_CR_BASE 0xff000084 /* 16-bit */
15 #define PM_CTR_BASE 0xff100004 /* 32-bit */
16
17 #define PMCR(n) (PM_CR_BASE + ((n) * 0x04))
18 #define PMCTRH(n) (PM_CTR_BASE + 0x00 + ((n) * 0x08))
19 #define PMCTRL(n) (PM_CTR_BASE + 0x04 + ((n) * 0x08))
20
21 #define PMCR_PMM_MASK 0x0000003f
22
23 #define PMCR_CLKF 0x00000100
24 #define PMCR_PMCLR 0x00002000
25 #define PMCR_PMST 0x00004000
26 #define PMCR_PMEN 0x00008000
27
28 static struct sh_pmu sh7750_pmu;
29
30 /*
31 * There are a number of events supported by each counter (33 in total).
32 * Since we have 2 counters, each counter will take the event code as it
33 * corresponds to the PMCR PMM setting. Each counter can be configured
34 * independently.
35 *
36 * Event Code Description
37 * ---------- -----------
38 *
39 * 0x01 Operand read access
40 * 0x02 Operand write access
41 * 0x03 UTLB miss
42 * 0x04 Operand cache read miss
43 * 0x05 Operand cache write miss
44 * 0x06 Instruction fetch (w/ cache)
45 * 0x07 Instruction TLB miss
46 * 0x08 Instruction cache miss
47 * 0x09 All operand accesses
48 * 0x0a All instruction accesses
49 * 0x0b OC RAM operand access
50 * 0x0d On-chip I/O space access
51 * 0x0e Operand access (r/w)
52 * 0x0f Operand cache miss (r/w)
53 * 0x10 Branch instruction
54 * 0x11 Branch taken
55 * 0x12 BSR/BSRF/JSR
56 * 0x13 Instruction execution
57 * 0x14 Instruction execution in parallel
58 * 0x15 FPU Instruction execution
59 * 0x16 Interrupt
60 * 0x17 NMI
61 * 0x18 trapa instruction execution
62 * 0x19 UBCA match
63 * 0x1a UBCB match
64 * 0x21 Instruction cache fill
65 * 0x22 Operand cache fill
66 * 0x23 Elapsed time
67 * 0x24 Pipeline freeze by I-cache miss
68 * 0x25 Pipeline freeze by D-cache miss
69 * 0x27 Pipeline freeze by branch instruction
70 * 0x28 Pipeline freeze by CPU register
71 * 0x29 Pipeline freeze by FPU
72 */
73
74 static const int sh7750_general_events[] = {
75 [PERF_COUNT_HW_CPU_CYCLES] = 0x0023,
76 [PERF_COUNT_HW_INSTRUCTIONS] = 0x000a,
77 [PERF_COUNT_HW_CACHE_REFERENCES] = 0x0006, /* I-cache */
78 [PERF_COUNT_HW_CACHE_MISSES] = 0x0008, /* I-cache */
79 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0010,
80 [PERF_COUNT_HW_BRANCH_MISSES] = -1,
81 [PERF_COUNT_HW_BUS_CYCLES] = -1,
82 };
83
84 #define C(x) PERF_COUNT_HW_CACHE_##x
85
86 static const int sh7750_cache_events
87 [PERF_COUNT_HW_CACHE_MAX]
88 [PERF_COUNT_HW_CACHE_OP_MAX]
89 [PERF_COUNT_HW_CACHE_RESULT_MAX] =
90 {
91 [ C(L1D) ] = {
92 [ C(OP_READ) ] = {
93 [ C(RESULT_ACCESS) ] = 0x0001,
94 [ C(RESULT_MISS) ] = 0x0004,
95 },
96 [ C(OP_WRITE) ] = {
97 [ C(RESULT_ACCESS) ] = 0x0002,
98 [ C(RESULT_MISS) ] = 0x0005,
99 },
100 [ C(OP_PREFETCH) ] = {
101 [ C(RESULT_ACCESS) ] = 0,
102 [ C(RESULT_MISS) ] = 0,
103 },
104 },
105
106 [ C(L1I) ] = {
107 [ C(OP_READ) ] = {
108 [ C(RESULT_ACCESS) ] = 0x0006,
109 [ C(RESULT_MISS) ] = 0x0008,
110 },
111 [ C(OP_WRITE) ] = {
112 [ C(RESULT_ACCESS) ] = -1,
113 [ C(RESULT_MISS) ] = -1,
114 },
115 [ C(OP_PREFETCH) ] = {
116 [ C(RESULT_ACCESS) ] = 0,
117 [ C(RESULT_MISS) ] = 0,
118 },
119 },
120
121 [ C(LL) ] = {
122 [ C(OP_READ) ] = {
123 [ C(RESULT_ACCESS) ] = 0,
124 [ C(RESULT_MISS) ] = 0,
125 },
126 [ C(OP_WRITE) ] = {
127 [ C(RESULT_ACCESS) ] = 0,
128 [ C(RESULT_MISS) ] = 0,
129 },
130 [ C(OP_PREFETCH) ] = {
131 [ C(RESULT_ACCESS) ] = 0,
132 [ C(RESULT_MISS) ] = 0,
133 },
134 },
135
136 [ C(DTLB) ] = {
137 [ C(OP_READ) ] = {
138 [ C(RESULT_ACCESS) ] = 0,
139 [ C(RESULT_MISS) ] = 0x0003,
140 },
141 [ C(OP_WRITE) ] = {
142 [ C(RESULT_ACCESS) ] = 0,
143 [ C(RESULT_MISS) ] = 0,
144 },
145 [ C(OP_PREFETCH) ] = {
146 [ C(RESULT_ACCESS) ] = 0,
147 [ C(RESULT_MISS) ] = 0,
148 },
149 },
150
151 [ C(ITLB) ] = {
152 [ C(OP_READ) ] = {
153 [ C(RESULT_ACCESS) ] = 0,
154 [ C(RESULT_MISS) ] = 0x0007,
155 },
156 [ C(OP_WRITE) ] = {
157 [ C(RESULT_ACCESS) ] = -1,
158 [ C(RESULT_MISS) ] = -1,
159 },
160 [ C(OP_PREFETCH) ] = {
161 [ C(RESULT_ACCESS) ] = -1,
162 [ C(RESULT_MISS) ] = -1,
163 },
164 },
165
166 [ C(BPU) ] = {
167 [ C(OP_READ) ] = {
168 [ C(RESULT_ACCESS) ] = -1,
169 [ C(RESULT_MISS) ] = -1,
170 },
171 [ C(OP_WRITE) ] = {
172 [ C(RESULT_ACCESS) ] = -1,
173 [ C(RESULT_MISS) ] = -1,
174 },
175 [ C(OP_PREFETCH) ] = {
176 [ C(RESULT_ACCESS) ] = -1,
177 [ C(RESULT_MISS) ] = -1,
178 },
179 },
180
181 [ C(NODE) ] = {
182 [ C(OP_READ) ] = {
183 [ C(RESULT_ACCESS) ] = -1,
184 [ C(RESULT_MISS) ] = -1,
185 },
186 [ C(OP_WRITE) ] = {
187 [ C(RESULT_ACCESS) ] = -1,
188 [ C(RESULT_MISS) ] = -1,
189 },
190 [ C(OP_PREFETCH) ] = {
191 [ C(RESULT_ACCESS) ] = -1,
192 [ C(RESULT_MISS) ] = -1,
193 },
194 },
195 };
196
197 static int sh7750_event_map(int event)
198 {
199 return sh7750_general_events[event];
200 }
201
202 static u64 sh7750_pmu_read(int idx)
203 {
204 return (u64)((u64)(__raw_readl(PMCTRH(idx)) & 0xffff) << 32) |
205 __raw_readl(PMCTRL(idx));
206 }
207
208 static void sh7750_pmu_disable(struct hw_perf_event *hwc, int idx)
209 {
210 unsigned int tmp;
211
212 tmp = __raw_readw(PMCR(idx));
213 tmp &= ~(PMCR_PMM_MASK | PMCR_PMEN);
214 __raw_writew(tmp, PMCR(idx));
215 }
216
217 static void sh7750_pmu_enable(struct hw_perf_event *hwc, int idx)
218 {
219 __raw_writew(__raw_readw(PMCR(idx)) | PMCR_PMCLR, PMCR(idx));
220 __raw_writew(hwc->config | PMCR_PMEN | PMCR_PMST, PMCR(idx));
221 }
222
223 static void sh7750_pmu_disable_all(void)
224 {
225 int i;
226
227 for (i = 0; i < sh7750_pmu.num_events; i++)
228 __raw_writew(__raw_readw(PMCR(i)) & ~PMCR_PMEN, PMCR(i));
229 }
230
231 static void sh7750_pmu_enable_all(void)
232 {
233 int i;
234
235 for (i = 0; i < sh7750_pmu.num_events; i++)
236 __raw_writew(__raw_readw(PMCR(i)) | PMCR_PMEN, PMCR(i));
237 }
238
239 static struct sh_pmu sh7750_pmu = {
240 .name = "sh7750",
241 .num_events = 2,
242 .event_map = sh7750_event_map,
243 .max_events = ARRAY_SIZE(sh7750_general_events),
244 .raw_event_mask = PMCR_PMM_MASK,
245 .cache_events = &sh7750_cache_events,
246 .read = sh7750_pmu_read,
247 .disable = sh7750_pmu_disable,
248 .enable = sh7750_pmu_enable,
249 .disable_all = sh7750_pmu_disable_all,
250 .enable_all = sh7750_pmu_enable_all,
251 };
252
253 static int __init sh7750_pmu_init(void)
254 {
255 /*
256 * Make sure this CPU actually has perf counters.
257 */
258 if (!(boot_cpu_data.flags & CPU_HAS_PERF_COUNTER)) {
259 pr_notice("HW perf events unsupported, software events only.\n");
260 return -ENODEV;
261 }
262
263 return register_sh_pmu(&sh7750_pmu);
264 }
265 early_initcall(sh7750_pmu_init);
266
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