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 
sh4a_event_map(int event)222 static int sh4a_event_map(int event)
223 {
224 	return sh4a_general_events[event];
225 }
226 
sh4a_pmu_read(int idx)227 static u64 sh4a_pmu_read(int idx)
228 {
229 	return __raw_readl(PPC_PMCTR(idx));
230 }
231 
sh4a_pmu_disable(struct hw_perf_event * hwc,int idx)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 
sh4a_pmu_enable(struct hw_perf_event * hwc,int idx)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 
sh4a_pmu_disable_all(void)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 
sh4a_pmu_enable_all(void)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 
sh4a_pmu_init(void)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