1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Performance counter support for MPC7450-family processors.
4 *
5 * Copyright 2008-2009 Paul Mackerras, IBM Corporation.
6 */
7 #include <linux/string.h>
8 #include <linux/perf_event.h>
9 #include <asm/reg.h>
10 #include <asm/cputable.h>
11
12 #define N_COUNTER 6 /* Number of hardware counters */
13 #define MAX_ALT 3 /* Maximum number of event alternative codes */
14
15 /*
16 * Bits in event code for MPC7450 family
17 */
18 #define PM_THRMULT_MSKS 0x40000
19 #define PM_THRESH_SH 12
20 #define PM_THRESH_MSK 0x3f
21 #define PM_PMC_SH 8
22 #define PM_PMC_MSK 7
23 #define PM_PMCSEL_MSK 0x7f
24
25 /*
26 * Classify events according to how specific their PMC requirements are.
27 * Result is:
28 * 0: can go on any PMC
29 * 1: can go on PMCs 1-4
30 * 2: can go on PMCs 1,2,4
31 * 3: can go on PMCs 1 or 2
32 * 4: can only go on one PMC
33 * -1: event code is invalid
34 */
35 #define N_CLASSES 5
36
37 static int mpc7450_classify_event(u32 event)
38 {
39 int pmc;
40
41 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
42 if (pmc) {
43 if (pmc > N_COUNTER)
44 return -1;
45 return 4;
46 }
47 event &= PM_PMCSEL_MSK;
48 if (event <= 1)
49 return 0;
50 if (event <= 7)
51 return 1;
52 if (event <= 13)
53 return 2;
54 if (event <= 22)
55 return 3;
56 return -1;
57 }
58
59 /*
60 * Events using threshold and possible threshold scale:
61 * code scale? name
62 * 11e N PM_INSTQ_EXCEED_CYC
63 * 11f N PM_ALTV_IQ_EXCEED_CYC
64 * 128 Y PM_DTLB_SEARCH_EXCEED_CYC
65 * 12b Y PM_LD_MISS_EXCEED_L1_CYC
66 * 220 N PM_CQ_EXCEED_CYC
67 * 30c N PM_GPR_RB_EXCEED_CYC
68 * 30d ? PM_FPR_IQ_EXCEED_CYC ?
69 * 311 Y PM_ITLB_SEARCH_EXCEED
70 * 410 N PM_GPR_IQ_EXCEED_CYC
71 */
72
73 /*
74 * Return use of threshold and threshold scale bits:
75 * 0 = uses neither, 1 = uses threshold, 2 = uses both
76 */
77 static int mpc7450_threshold_use(u32 event)
78 {
79 int pmc, sel;
80
81 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
82 sel = event & PM_PMCSEL_MSK;
83 switch (pmc) {
84 case 1:
85 if (sel == 0x1e || sel == 0x1f)
86 return 1;
87 if (sel == 0x28 || sel == 0x2b)
88 return 2;
89 break;
90 case 2:
91 if (sel == 0x20)
92 return 1;
93 break;
94 case 3:
95 if (sel == 0xc || sel == 0xd)
96 return 1;
97 if (sel == 0x11)
98 return 2;
99 break;
100 case 4:
101 if (sel == 0x10)
102 return 1;
103 break;
104 }
105 return 0;
106 }
107
108 /*
109 * Layout of constraint bits:
110 * 33222222222211111111110000000000
111 * 10987654321098765432109876543210
112 * |< >< > < > < ><><><><><><>
113 * TS TV G4 G3 G2P6P5P4P3P2P1
114 *
115 * P1 - P6
116 * 0 - 11: Count of events needing PMC1 .. PMC6
117 *
118 * G2
119 * 12 - 14: Count of events needing PMC1 or PMC2
120 *
121 * G3
122 * 16 - 18: Count of events needing PMC1, PMC2 or PMC4
123 *
124 * G4
125 * 20 - 23: Count of events needing PMC1, PMC2, PMC3 or PMC4
126 *
127 * TV
128 * 24 - 29: Threshold value requested
129 *
130 * TS
131 * 30: Threshold scale value requested
132 */
133
134 static u32 pmcbits[N_COUNTER][2] = {
135 { 0x00844002, 0x00111001 }, /* PMC1 mask, value: P1,G2,G3,G4 */
136 { 0x00844008, 0x00111004 }, /* PMC2: P2,G2,G3,G4 */
137 { 0x00800020, 0x00100010 }, /* PMC3: P3,G4 */
138 { 0x00840080, 0x00110040 }, /* PMC4: P4,G3,G4 */
139 { 0x00000200, 0x00000100 }, /* PMC5: P5 */
140 { 0x00000800, 0x00000400 } /* PMC6: P6 */
141 };
142
143 static u32 classbits[N_CLASSES - 1][2] = {
144 { 0x00000000, 0x00000000 }, /* class 0: no constraint */
145 { 0x00800000, 0x00100000 }, /* class 1: G4 */
146 { 0x00040000, 0x00010000 }, /* class 2: G3 */
147 { 0x00004000, 0x00001000 }, /* class 3: G2 */
148 };
149
150 static int mpc7450_get_constraint(u64 event, unsigned long *maskp,
151 unsigned long *valp, u64 event_config1 __maybe_unused)
152 {
153 int pmc, class;
154 u32 mask, value;
155 int thresh, tuse;
156
157 class = mpc7450_classify_event(event);
158 if (class < 0)
159 return -1;
160 if (class == 4) {
161 pmc = ((unsigned int)event >> PM_PMC_SH) & PM_PMC_MSK;
162 mask = pmcbits[pmc - 1][0];
163 value = pmcbits[pmc - 1][1];
164 } else {
165 mask = classbits[class][0];
166 value = classbits[class][1];
167 }
168
169 tuse = mpc7450_threshold_use(event);
170 if (tuse) {
171 thresh = ((unsigned int)event >> PM_THRESH_SH) & PM_THRESH_MSK;
172 mask |= 0x3f << 24;
173 value |= thresh << 24;
174 if (tuse == 2) {
175 mask |= 0x40000000;
176 if ((unsigned int)event & PM_THRMULT_MSKS)
177 value |= 0x40000000;
178 }
179 }
180
181 *maskp = mask;
182 *valp = value;
183 return 0;
184 }
185
186 static const unsigned int event_alternatives[][MAX_ALT] = {
187 { 0x217, 0x317 }, /* PM_L1_DCACHE_MISS */
188 { 0x418, 0x50f, 0x60f }, /* PM_SNOOP_RETRY */
189 { 0x502, 0x602 }, /* PM_L2_HIT */
190 { 0x503, 0x603 }, /* PM_L3_HIT */
191 { 0x504, 0x604 }, /* PM_L2_ICACHE_MISS */
192 { 0x505, 0x605 }, /* PM_L3_ICACHE_MISS */
193 { 0x506, 0x606 }, /* PM_L2_DCACHE_MISS */
194 { 0x507, 0x607 }, /* PM_L3_DCACHE_MISS */
195 { 0x50a, 0x623 }, /* PM_LD_HIT_L3 */
196 { 0x50b, 0x624 }, /* PM_ST_HIT_L3 */
197 { 0x50d, 0x60d }, /* PM_L2_TOUCH_HIT */
198 { 0x50e, 0x60e }, /* PM_L3_TOUCH_HIT */
199 { 0x512, 0x612 }, /* PM_INT_LOCAL */
200 { 0x513, 0x61d }, /* PM_L2_MISS */
201 { 0x514, 0x61e }, /* PM_L3_MISS */
202 };
203
204 /*
205 * Scan the alternatives table for a match and return the
206 * index into the alternatives table if found, else -1.
207 */
208 static int find_alternative(u32 event)
209 {
210 int i, j;
211
212 for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
213 if (event < event_alternatives[i][0])
214 break;
215 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
216 if (event == event_alternatives[i][j])
217 return i;
218 }
219 return -1;
220 }
221
222 static int mpc7450_get_alternatives(u64 event, unsigned int flags, u64 alt[])
223 {
224 int i, j, nalt = 1;
225 u32 ae;
226
227 alt[0] = event;
228 nalt = 1;
229 i = find_alternative((u32)event);
230 if (i >= 0) {
231 for (j = 0; j < MAX_ALT; ++j) {
232 ae = event_alternatives[i][j];
233 if (ae && ae != (u32)event)
234 alt[nalt++] = ae;
235 }
236 }
237 return nalt;
238 }
239
240 /*
241 * Bitmaps of which PMCs each class can use for classes 0 - 3.
242 * Bit i is set if PMC i+1 is usable.
243 */
244 static const u8 classmap[N_CLASSES] = {
245 0x3f, 0x0f, 0x0b, 0x03, 0
246 };
247
248 /* Bit position and width of each PMCSEL field */
249 static const int pmcsel_shift[N_COUNTER] = {
250 6, 0, 27, 22, 17, 11
251 };
252 static const u32 pmcsel_mask[N_COUNTER] = {
253 0x7f, 0x3f, 0x1f, 0x1f, 0x1f, 0x3f
254 };
255
256 /*
257 * Compute MMCR0/1/2 values for a set of events.
258 */
259 static int mpc7450_compute_mmcr(u64 event[], int n_ev, unsigned int hwc[],
260 struct mmcr_regs *mmcr,
261 struct perf_event *pevents[],
262 u32 flags __maybe_unused)
263 {
264 u8 event_index[N_CLASSES][N_COUNTER];
265 int n_classevent[N_CLASSES];
266 int i, j, class, tuse;
267 u32 pmc_inuse = 0, pmc_avail;
268 u32 mmcr0 = 0, mmcr1 = 0, mmcr2 = 0;
269 u32 ev, pmc, thresh;
270
271 if (n_ev > N_COUNTER)
272 return -1;
273
274 /* First pass: count usage in each class */
275 for (i = 0; i < N_CLASSES; ++i)
276 n_classevent[i] = 0;
277 for (i = 0; i < n_ev; ++i) {
278 class = mpc7450_classify_event(event[i]);
279 if (class < 0)
280 return -1;
281 j = n_classevent[class]++;
282 event_index[class][j] = i;
283 }
284
285 /* Second pass: allocate PMCs from most specific event to least */
286 for (class = N_CLASSES - 1; class >= 0; --class) {
287 for (i = 0; i < n_classevent[class]; ++i) {
288 ev = event[event_index[class][i]];
289 if (class == 4) {
290 pmc = (ev >> PM_PMC_SH) & PM_PMC_MSK;
291 if (pmc_inuse & (1 << (pmc - 1)))
292 return -1;
293 } else {
294 /* Find a suitable PMC */
295 pmc_avail = classmap[class] & ~pmc_inuse;
296 if (!pmc_avail)
297 return -1;
298 pmc = ffs(pmc_avail);
299 }
300 pmc_inuse |= 1 << (pmc - 1);
301
302 tuse = mpc7450_threshold_use(ev);
303 if (tuse) {
304 thresh = (ev >> PM_THRESH_SH) & PM_THRESH_MSK;
305 mmcr0 |= thresh << 16;
306 if (tuse == 2 && (ev & PM_THRMULT_MSKS))
307 mmcr2 = 0x80000000;
308 }
309 ev &= pmcsel_mask[pmc - 1];
310 ev <<= pmcsel_shift[pmc - 1];
311 if (pmc <= 2)
312 mmcr0 |= ev;
313 else
314 mmcr1 |= ev;
315 hwc[event_index[class][i]] = pmc - 1;
316 }
317 }
318
319 if (pmc_inuse & 1)
320 mmcr0 |= MMCR0_PMC1CE;
321 if (pmc_inuse & 0x3e)
322 mmcr0 |= MMCR0_PMCnCE;
323
324 /* Return MMCRx values */
325 mmcr->mmcr0 = mmcr0;
326 mmcr->mmcr1 = mmcr1;
327 mmcr->mmcr2 = mmcr2;
328 /*
329 * 32-bit doesn't have an MMCRA and uses SPRN_MMCR2 to define
330 * SPRN_MMCRA. So assign mmcra of cpu_hw_events with `mmcr2`
331 * value to ensure that any write to this SPRN_MMCRA will
332 * use mmcr2 value.
333 */
334 mmcr->mmcra = mmcr2;
335 return 0;
336 }
337
338 /*
339 * Disable counting by a PMC.
340 * Note that the pmc argument is 0-based here, not 1-based.
341 */
342 static void mpc7450_disable_pmc(unsigned int pmc, struct mmcr_regs *mmcr)
343 {
344 if (pmc <= 1)
345 mmcr->mmcr0 &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]);
346 else
347 mmcr->mmcr1 &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]);
348 }
349
350 static int mpc7450_generic_events[] = {
351 [PERF_COUNT_HW_CPU_CYCLES] = 1,
352 [PERF_COUNT_HW_INSTRUCTIONS] = 2,
353 [PERF_COUNT_HW_CACHE_MISSES] = 0x217, /* PM_L1_DCACHE_MISS */
354 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x122, /* PM_BR_CMPL */
355 [PERF_COUNT_HW_BRANCH_MISSES] = 0x41c, /* PM_BR_MPRED */
356 };
357
358 #define C(x) PERF_COUNT_HW_CACHE_##x
359
360 /*
361 * Table of generalized cache-related events.
362 * 0 means not supported, -1 means nonsensical, other values
363 * are event codes.
364 */
365 static u64 mpc7450_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
366 [C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */
367 [C(OP_READ)] = { 0, 0x225 },
368 [C(OP_WRITE)] = { 0, 0x227 },
369 [C(OP_PREFETCH)] = { 0, 0 },
370 },
371 [C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */
372 [C(OP_READ)] = { 0x129, 0x115 },
373 [C(OP_WRITE)] = { -1, -1 },
374 [C(OP_PREFETCH)] = { 0x634, 0 },
375 },
376 [C(LL)] = { /* RESULT_ACCESS RESULT_MISS */
377 [C(OP_READ)] = { 0, 0 },
378 [C(OP_WRITE)] = { 0, 0 },
379 [C(OP_PREFETCH)] = { 0, 0 },
380 },
381 [C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */
382 [C(OP_READ)] = { 0, 0x312 },
383 [C(OP_WRITE)] = { -1, -1 },
384 [C(OP_PREFETCH)] = { -1, -1 },
385 },
386 [C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */
387 [C(OP_READ)] = { 0, 0x223 },
388 [C(OP_WRITE)] = { -1, -1 },
389 [C(OP_PREFETCH)] = { -1, -1 },
390 },
391 [C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */
392 [C(OP_READ)] = { 0x122, 0x41c },
393 [C(OP_WRITE)] = { -1, -1 },
394 [C(OP_PREFETCH)] = { -1, -1 },
395 },
396 [C(NODE)] = { /* RESULT_ACCESS RESULT_MISS */
397 [C(OP_READ)] = { -1, -1 },
398 [C(OP_WRITE)] = { -1, -1 },
399 [C(OP_PREFETCH)] = { -1, -1 },
400 },
401 };
402
403 struct power_pmu mpc7450_pmu = {
404 .name = "MPC7450 family",
405 .n_counter = N_COUNTER,
406 .max_alternatives = MAX_ALT,
407 .add_fields = 0x00111555ul,
408 .test_adder = 0x00301000ul,
409 .compute_mmcr = mpc7450_compute_mmcr,
410 .get_constraint = mpc7450_get_constraint,
411 .get_alternatives = mpc7450_get_alternatives,
412 .disable_pmc = mpc7450_disable_pmc,
413 .n_generic = ARRAY_SIZE(mpc7450_generic_events),
414 .generic_events = mpc7450_generic_events,
415 .cache_events = &mpc7450_cache_events,
416 };
417
418 static int __init init_mpc7450_pmu(void)
419 {
420 if (!pvr_version_is(PVR_VER_7450) && !pvr_version_is(PVR_VER_7455) &&
421 !pvr_version_is(PVR_VER_7447) && !pvr_version_is(PVR_VER_7447A) &&
422 !pvr_version_is(PVR_VER_7448))
423 return -ENODEV;
424
425 return register_power_pmu(&mpc7450_pmu);
426 }
427
428 early_initcall(init_mpc7450_pmu);
429
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