1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Performance events support for SH-4A performance counters
4 *
5 * Copyright (C) 2009, 2010 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 PPC_CCBR(idx) (0xff200800 + (sizeof(u32) * idx))
15 #define PPC_PMCTR(idx) (0xfc100000 + (sizeof(u32) * idx))
16
17 #define CCBR_CIT_MASK (0x7ff << 6)
18 #define CCBR_DUC (1 << 3)
19 #define CCBR_CMDS (1 << 1)
20 #define CCBR_PPCE (1 << 0)
21
22 #ifdef CONFIG_CPU_SHX3
23 /*
24 * The PMCAT location for SH-X3 CPUs was quietly moved, while the CCBR
25 * and PMCTR locations remains tentatively constant. This change remains
26 * wholly undocumented, and was simply found through trial and error.
27 *
28 * Early cuts of SH-X3 still appear to use the SH-X/SH-X2 locations, and
29 * it's unclear when this ceased to be the case. For now we always use
30 * the new location (if future parts keep up with this trend then
31 * scanning for them at runtime also remains a viable option.)
32 *
33 * The gap in the register space also suggests that there are other
34 * undocumented counters, so this will need to be revisited at a later
35 * point in time.
36 */
37 #define PPC_PMCAT 0xfc100240
38 #else
39 #define PPC_PMCAT 0xfc100080
40 #endif
41
42 #define PMCAT_OVF3 (1 << 27)
43 #define PMCAT_CNN3 (1 << 26)
44 #define PMCAT_CLR3 (1 << 25)
45 #define PMCAT_OVF2 (1 << 19)
46 #define PMCAT_CLR2 (1 << 17)
47 #define PMCAT_OVF1 (1 << 11)
48 #define PMCAT_CNN1 (1 << 10)
49 #define PMCAT_CLR1 (1 << 9)
50 #define PMCAT_OVF0 (1 << 3)
51 #define PMCAT_CLR0 (1 << 1)
52
53 static struct sh_pmu sh4a_pmu;
54
55 /*
56 * Supported raw event codes:
57 *
58 * Event Code Description
59 * ---------- -----------
60 *
61 * 0x0000 number of elapsed cycles
62 * 0x0200 number of elapsed cycles in privileged mode
63 * 0x0280 number of elapsed cycles while SR.BL is asserted
64 * 0x0202 instruction execution
65 * 0x0203 instruction execution in parallel
66 * 0x0204 number of unconditional branches
67 * 0x0208 number of exceptions
68 * 0x0209 number of interrupts
69 * 0x0220 UTLB miss caused by instruction fetch
70 * 0x0222 UTLB miss caused by operand access
71 * 0x02a0 number of ITLB misses
72 * 0x0028 number of accesses to instruction memories
73 * 0x0029 number of accesses to instruction cache
74 * 0x002a instruction cache miss
75 * 0x022e number of access to instruction X/Y memory
76 * 0x0030 number of reads to operand memories
77 * 0x0038 number of writes to operand memories
78 * 0x0031 number of operand cache read accesses
79 * 0x0039 number of operand cache write accesses
80 * 0x0032 operand cache read miss
81 * 0x003a operand cache write miss
82 * 0x0236 number of reads to operand X/Y memory
83 * 0x023e number of writes to operand X/Y memory
84 * 0x0237 number of reads to operand U memory
85 * 0x023f number of writes to operand U memory
86 * 0x0337 number of U memory read buffer misses
87 * 0x02b4 number of wait cycles due to operand read access
88 * 0x02bc number of wait cycles due to operand write access
89 * 0x0033 number of wait cycles due to operand cache read miss
90 * 0x003b number of wait cycles due to operand cache write miss
91 */
92
93 /*
94 * Special reserved bits used by hardware emulators, read values will
95 * vary, but writes must always be 0.
96 */
97 #define PMCAT_EMU_CLR_MASK ((1 << 24) | (1 << 16) | (1 << 8) | (1 << 0))
98
99 static const int sh4a_general_events[] = {
100 [PERF_COUNT_HW_CPU_CYCLES] = 0x0000,
101 [PERF_COUNT_HW_INSTRUCTIONS] = 0x0202,
102 [PERF_COUNT_HW_CACHE_REFERENCES] = 0x0029, /* I-cache */
103 [PERF_COUNT_HW_CACHE_MISSES] = 0x002a, /* I-cache */
104 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0204,
105 [PERF_COUNT_HW_BRANCH_MISSES] = -1,
106 [PERF_COUNT_HW_BUS_CYCLES] = -1,
107 };
108
109 #define C(x) PERF_COUNT_HW_CACHE_##x
110
111 static const int sh4a_cache_events
112 [PERF_COUNT_HW_CACHE_MAX]
113 [PERF_COUNT_HW_CACHE_OP_MAX]
114 [PERF_COUNT_HW_CACHE_RESULT_MAX] =
115 {
116 [ C(L1D) ] = {
117 [ C(OP_READ) ] = {
118 [ C(RESULT_ACCESS) ] = 0x0031,
119 [ C(RESULT_MISS) ] = 0x0032,
120 },
121 [ C(OP_WRITE) ] = {
122 [ C(RESULT_ACCESS) ] = 0x0039,
123 [ C(RESULT_MISS) ] = 0x003a,
124 },
125 [ C(OP_PREFETCH) ] = {
126 [ C(RESULT_ACCESS) ] = 0,
127 [ C(RESULT_MISS) ] = 0,
128 },
129 },
130
131 [ C(L1I) ] = {
132 [ C(OP_READ) ] = {
133 [ C(RESULT_ACCESS) ] = 0x0029,
134 [ C(RESULT_MISS) ] = 0x002a,
135 },
136 [ C(OP_WRITE) ] = {
137 [ C(RESULT_ACCESS) ] = -1,
138 [ C(RESULT_MISS) ] = -1,
139 },
140 [ C(OP_PREFETCH) ] = {
141 [ C(RESULT_ACCESS) ] = 0,
142 [ C(RESULT_MISS) ] = 0,
143 },
144 },
145
146 [ C(LL) ] = {
147 [ C(OP_READ) ] = {
148 [ C(RESULT_ACCESS) ] = 0x0030,
149 [ C(RESULT_MISS) ] = 0,
150 },
151 [ C(OP_WRITE) ] = {
152 [ C(RESULT_ACCESS) ] = 0x0038,
153 [ C(RESULT_MISS) ] = 0,
154 },
155 [ C(OP_PREFETCH) ] = {
156 [ C(RESULT_ACCESS) ] = 0,
157 [ C(RESULT_MISS) ] = 0,
158 },
159 },
160
161 [ C(DTLB) ] = {
162 [ C(OP_READ) ] = {
163 [ C(RESULT_ACCESS) ] = 0x0222,
164 [ C(RESULT_MISS) ] = 0x0220,
165 },
166 [ C(OP_WRITE) ] = {
167 [ C(RESULT_ACCESS) ] = 0,
168 [ C(RESULT_MISS) ] = 0,
169 },
170 [ C(OP_PREFETCH) ] = {
171 [ C(RESULT_ACCESS) ] = 0,
172 [ C(RESULT_MISS) ] = 0,
173 },
174 },
175
176 [ C(ITLB) ] = {
177 [ C(OP_READ) ] = {
178 [ C(RESULT_ACCESS) ] = 0,
179 [ C(RESULT_MISS) ] = 0x02a0,
180 },
181 [ C(OP_WRITE) ] = {
182 [ C(RESULT_ACCESS) ] = -1,
183 [ C(RESULT_MISS) ] = -1,
184 },
185 [ C(OP_PREFETCH) ] = {
186 [ C(RESULT_ACCESS) ] = -1,
187 [ C(RESULT_MISS) ] = -1,
188 },
189 },
190
191 [ C(BPU) ] = {
192 [ C(OP_READ) ] = {
193 [ C(RESULT_ACCESS) ] = -1,
194 [ C(RESULT_MISS) ] = -1,
195 },
196 [ C(OP_WRITE) ] = {
197 [ C(RESULT_ACCESS) ] = -1,
198 [ C(RESULT_MISS) ] = -1,
199 },
200 [ C(OP_PREFETCH) ] = {
201 [ C(RESULT_ACCESS) ] = -1,
202 [ C(RESULT_MISS) ] = -1,
203 },
204 },
205
206 [ C(NODE) ] = {
207 [ C(OP_READ) ] = {
208 [ C(RESULT_ACCESS) ] = -1,
209 [ C(RESULT_MISS) ] = -1,
210 },
211 [ C(OP_WRITE) ] = {
212 [ C(RESULT_ACCESS) ] = -1,
213 [ C(RESULT_MISS) ] = -1,
214 },
215 [ C(OP_PREFETCH) ] = {
216 [ C(RESULT_ACCESS) ] = -1,
217 [ C(RESULT_MISS) ] = -1,
218 },
219 },
220 };
221
222 static int sh4a_event_map(int event)
223 {
224 return sh4a_general_events[event];
225 }
226
227 static u64 sh4a_pmu_read(int idx)
228 {
229 return __raw_readl(PPC_PMCTR(idx));
230 }
231
232 static void sh4a_pmu_disable(struct hw_perf_event *hwc, int idx)
233 {
234 unsigned int tmp;
235
236 tmp = __raw_readl(PPC_CCBR(idx));
237 tmp &= ~(CCBR_CIT_MASK | CCBR_DUC);
238 __raw_writel(tmp, PPC_CCBR(idx));
239 }
240
241 static void sh4a_pmu_enable(struct hw_perf_event *hwc, int idx)
242 {
243 unsigned int tmp;
244
245 tmp = __raw_readl(PPC_PMCAT);
246 tmp &= ~PMCAT_EMU_CLR_MASK;
247 tmp |= idx ? PMCAT_CLR1 : PMCAT_CLR0;
248 __raw_writel(tmp, PPC_PMCAT);
249
250 tmp = __raw_readl(PPC_CCBR(idx));
251 tmp |= (hwc->config << 6) | CCBR_CMDS | CCBR_PPCE;
252 __raw_writel(tmp, PPC_CCBR(idx));
253
254 __raw_writel(__raw_readl(PPC_CCBR(idx)) | CCBR_DUC, PPC_CCBR(idx));
255 }
256
257 static void sh4a_pmu_disable_all(void)
258 {
259 int i;
260
261 for (i = 0; i < sh4a_pmu.num_events; i++)
262 __raw_writel(__raw_readl(PPC_CCBR(i)) & ~CCBR_DUC, PPC_CCBR(i));
263 }
264
265 static void sh4a_pmu_enable_all(void)
266 {
267 int i;
268
269 for (i = 0; i < sh4a_pmu.num_events; i++)
270 __raw_writel(__raw_readl(PPC_CCBR(i)) | CCBR_DUC, PPC_CCBR(i));
271 }
272
273 static struct sh_pmu sh4a_pmu = {
274 .name = "sh4a",
275 .num_events = 2,
276 .event_map = sh4a_event_map,
277 .max_events = ARRAY_SIZE(sh4a_general_events),
278 .raw_event_mask = 0x3ff,
279 .cache_events = &sh4a_cache_events,
280 .read = sh4a_pmu_read,
281 .disable = sh4a_pmu_disable,
282 .enable = sh4a_pmu_enable,
283 .disable_all = sh4a_pmu_disable_all,
284 .enable_all = sh4a_pmu_enable_all,
285 };
286
287 static int __init sh4a_pmu_init(void)
288 {
289 /*
290 * Make sure this CPU actually has perf counters.
291 */
292 if (!(boot_cpu_data.flags & CPU_HAS_PERF_COUNTER)) {
293 pr_notice("HW perf events unsupported, software events only.\n");
294 return -ENODEV;
295 }
296
297 return register_sh_pmu(&sh4a_pmu);
298 }
299 early_initcall(sh4a_pmu_init);
300
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