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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
37static 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 */
77static 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
134static 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
143static 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
150static 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
186static 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 */
208static 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
222static 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 */
244static const u8 classmap[N_CLASSES] = {
245 0x3f, 0x0f, 0x0b, 0x03, 0
246};
247
248/* Bit position and width of each PMCSEL field */
249static const int pmcsel_shift[N_COUNTER] = {
250 6, 0, 27, 22, 17, 11
251};
252static 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 */
259static 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 */
342static 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
350static 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 */
365static 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
403struct 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
418static 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
428early_initcall(init_mpc7450_pmu);
1/*
2 * Performance counter support for MPC7450-family processors.
3 *
4 * Copyright 2008-2009 Paul Mackerras, IBM Corporation.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11#include <linux/string.h>
12#include <linux/perf_event.h>
13#include <asm/reg.h>
14#include <asm/cputable.h>
15
16#define N_COUNTER 6 /* Number of hardware counters */
17#define MAX_ALT 3 /* Maximum number of event alternative codes */
18
19/*
20 * Bits in event code for MPC7450 family
21 */
22#define PM_THRMULT_MSKS 0x40000
23#define PM_THRESH_SH 12
24#define PM_THRESH_MSK 0x3f
25#define PM_PMC_SH 8
26#define PM_PMC_MSK 7
27#define PM_PMCSEL_MSK 0x7f
28
29/*
30 * Classify events according to how specific their PMC requirements are.
31 * Result is:
32 * 0: can go on any PMC
33 * 1: can go on PMCs 1-4
34 * 2: can go on PMCs 1,2,4
35 * 3: can go on PMCs 1 or 2
36 * 4: can only go on one PMC
37 * -1: event code is invalid
38 */
39#define N_CLASSES 5
40
41static int mpc7450_classify_event(u32 event)
42{
43 int pmc;
44
45 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
46 if (pmc) {
47 if (pmc > N_COUNTER)
48 return -1;
49 return 4;
50 }
51 event &= PM_PMCSEL_MSK;
52 if (event <= 1)
53 return 0;
54 if (event <= 7)
55 return 1;
56 if (event <= 13)
57 return 2;
58 if (event <= 22)
59 return 3;
60 return -1;
61}
62
63/*
64 * Events using threshold and possible threshold scale:
65 * code scale? name
66 * 11e N PM_INSTQ_EXCEED_CYC
67 * 11f N PM_ALTV_IQ_EXCEED_CYC
68 * 128 Y PM_DTLB_SEARCH_EXCEED_CYC
69 * 12b Y PM_LD_MISS_EXCEED_L1_CYC
70 * 220 N PM_CQ_EXCEED_CYC
71 * 30c N PM_GPR_RB_EXCEED_CYC
72 * 30d ? PM_FPR_IQ_EXCEED_CYC ?
73 * 311 Y PM_ITLB_SEARCH_EXCEED
74 * 410 N PM_GPR_IQ_EXCEED_CYC
75 */
76
77/*
78 * Return use of threshold and threshold scale bits:
79 * 0 = uses neither, 1 = uses threshold, 2 = uses both
80 */
81static int mpc7450_threshold_use(u32 event)
82{
83 int pmc, sel;
84
85 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
86 sel = event & PM_PMCSEL_MSK;
87 switch (pmc) {
88 case 1:
89 if (sel == 0x1e || sel == 0x1f)
90 return 1;
91 if (sel == 0x28 || sel == 0x2b)
92 return 2;
93 break;
94 case 2:
95 if (sel == 0x20)
96 return 1;
97 break;
98 case 3:
99 if (sel == 0xc || sel == 0xd)
100 return 1;
101 if (sel == 0x11)
102 return 2;
103 break;
104 case 4:
105 if (sel == 0x10)
106 return 1;
107 break;
108 }
109 return 0;
110}
111
112/*
113 * Layout of constraint bits:
114 * 33222222222211111111110000000000
115 * 10987654321098765432109876543210
116 * |< >< > < > < ><><><><><><>
117 * TS TV G4 G3 G2P6P5P4P3P2P1
118 *
119 * P1 - P6
120 * 0 - 11: Count of events needing PMC1 .. PMC6
121 *
122 * G2
123 * 12 - 14: Count of events needing PMC1 or PMC2
124 *
125 * G3
126 * 16 - 18: Count of events needing PMC1, PMC2 or PMC4
127 *
128 * G4
129 * 20 - 23: Count of events needing PMC1, PMC2, PMC3 or PMC4
130 *
131 * TV
132 * 24 - 29: Threshold value requested
133 *
134 * TS
135 * 30: Threshold scale value requested
136 */
137
138static u32 pmcbits[N_COUNTER][2] = {
139 { 0x00844002, 0x00111001 }, /* PMC1 mask, value: P1,G2,G3,G4 */
140 { 0x00844008, 0x00111004 }, /* PMC2: P2,G2,G3,G4 */
141 { 0x00800020, 0x00100010 }, /* PMC3: P3,G4 */
142 { 0x00840080, 0x00110040 }, /* PMC4: P4,G3,G4 */
143 { 0x00000200, 0x00000100 }, /* PMC5: P5 */
144 { 0x00000800, 0x00000400 } /* PMC6: P6 */
145};
146
147static u32 classbits[N_CLASSES - 1][2] = {
148 { 0x00000000, 0x00000000 }, /* class 0: no constraint */
149 { 0x00800000, 0x00100000 }, /* class 1: G4 */
150 { 0x00040000, 0x00010000 }, /* class 2: G3 */
151 { 0x00004000, 0x00001000 }, /* class 3: G2 */
152};
153
154static int mpc7450_get_constraint(u64 event, unsigned long *maskp,
155 unsigned long *valp)
156{
157 int pmc, class;
158 u32 mask, value;
159 int thresh, tuse;
160
161 class = mpc7450_classify_event(event);
162 if (class < 0)
163 return -1;
164 if (class == 4) {
165 pmc = ((unsigned int)event >> PM_PMC_SH) & PM_PMC_MSK;
166 mask = pmcbits[pmc - 1][0];
167 value = pmcbits[pmc - 1][1];
168 } else {
169 mask = classbits[class][0];
170 value = classbits[class][1];
171 }
172
173 tuse = mpc7450_threshold_use(event);
174 if (tuse) {
175 thresh = ((unsigned int)event >> PM_THRESH_SH) & PM_THRESH_MSK;
176 mask |= 0x3f << 24;
177 value |= thresh << 24;
178 if (tuse == 2) {
179 mask |= 0x40000000;
180 if ((unsigned int)event & PM_THRMULT_MSKS)
181 value |= 0x40000000;
182 }
183 }
184
185 *maskp = mask;
186 *valp = value;
187 return 0;
188}
189
190static const unsigned int event_alternatives[][MAX_ALT] = {
191 { 0x217, 0x317 }, /* PM_L1_DCACHE_MISS */
192 { 0x418, 0x50f, 0x60f }, /* PM_SNOOP_RETRY */
193 { 0x502, 0x602 }, /* PM_L2_HIT */
194 { 0x503, 0x603 }, /* PM_L3_HIT */
195 { 0x504, 0x604 }, /* PM_L2_ICACHE_MISS */
196 { 0x505, 0x605 }, /* PM_L3_ICACHE_MISS */
197 { 0x506, 0x606 }, /* PM_L2_DCACHE_MISS */
198 { 0x507, 0x607 }, /* PM_L3_DCACHE_MISS */
199 { 0x50a, 0x623 }, /* PM_LD_HIT_L3 */
200 { 0x50b, 0x624 }, /* PM_ST_HIT_L3 */
201 { 0x50d, 0x60d }, /* PM_L2_TOUCH_HIT */
202 { 0x50e, 0x60e }, /* PM_L3_TOUCH_HIT */
203 { 0x512, 0x612 }, /* PM_INT_LOCAL */
204 { 0x513, 0x61d }, /* PM_L2_MISS */
205 { 0x514, 0x61e }, /* PM_L3_MISS */
206};
207
208/*
209 * Scan the alternatives table for a match and return the
210 * index into the alternatives table if found, else -1.
211 */
212static int find_alternative(u32 event)
213{
214 int i, j;
215
216 for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
217 if (event < event_alternatives[i][0])
218 break;
219 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
220 if (event == event_alternatives[i][j])
221 return i;
222 }
223 return -1;
224}
225
226static int mpc7450_get_alternatives(u64 event, unsigned int flags, u64 alt[])
227{
228 int i, j, nalt = 1;
229 u32 ae;
230
231 alt[0] = event;
232 nalt = 1;
233 i = find_alternative((u32)event);
234 if (i >= 0) {
235 for (j = 0; j < MAX_ALT; ++j) {
236 ae = event_alternatives[i][j];
237 if (ae && ae != (u32)event)
238 alt[nalt++] = ae;
239 }
240 }
241 return nalt;
242}
243
244/*
245 * Bitmaps of which PMCs each class can use for classes 0 - 3.
246 * Bit i is set if PMC i+1 is usable.
247 */
248static const u8 classmap[N_CLASSES] = {
249 0x3f, 0x0f, 0x0b, 0x03, 0
250};
251
252/* Bit position and width of each PMCSEL field */
253static const int pmcsel_shift[N_COUNTER] = {
254 6, 0, 27, 22, 17, 11
255};
256static const u32 pmcsel_mask[N_COUNTER] = {
257 0x7f, 0x3f, 0x1f, 0x1f, 0x1f, 0x3f
258};
259
260/*
261 * Compute MMCR0/1/2 values for a set of events.
262 */
263static int mpc7450_compute_mmcr(u64 event[], int n_ev,
264 unsigned int hwc[], unsigned long mmcr[])
265{
266 u8 event_index[N_CLASSES][N_COUNTER];
267 int n_classevent[N_CLASSES];
268 int i, j, class, tuse;
269 u32 pmc_inuse = 0, pmc_avail;
270 u32 mmcr0 = 0, mmcr1 = 0, mmcr2 = 0;
271 u32 ev, pmc, thresh;
272
273 if (n_ev > N_COUNTER)
274 return -1;
275
276 /* First pass: count usage in each class */
277 for (i = 0; i < N_CLASSES; ++i)
278 n_classevent[i] = 0;
279 for (i = 0; i < n_ev; ++i) {
280 class = mpc7450_classify_event(event[i]);
281 if (class < 0)
282 return -1;
283 j = n_classevent[class]++;
284 event_index[class][j] = i;
285 }
286
287 /* Second pass: allocate PMCs from most specific event to least */
288 for (class = N_CLASSES - 1; class >= 0; --class) {
289 for (i = 0; i < n_classevent[class]; ++i) {
290 ev = event[event_index[class][i]];
291 if (class == 4) {
292 pmc = (ev >> PM_PMC_SH) & PM_PMC_MSK;
293 if (pmc_inuse & (1 << (pmc - 1)))
294 return -1;
295 } else {
296 /* Find a suitable PMC */
297 pmc_avail = classmap[class] & ~pmc_inuse;
298 if (!pmc_avail)
299 return -1;
300 pmc = ffs(pmc_avail);
301 }
302 pmc_inuse |= 1 << (pmc - 1);
303
304 tuse = mpc7450_threshold_use(ev);
305 if (tuse) {
306 thresh = (ev >> PM_THRESH_SH) & PM_THRESH_MSK;
307 mmcr0 |= thresh << 16;
308 if (tuse == 2 && (ev & PM_THRMULT_MSKS))
309 mmcr2 = 0x80000000;
310 }
311 ev &= pmcsel_mask[pmc - 1];
312 ev <<= pmcsel_shift[pmc - 1];
313 if (pmc <= 2)
314 mmcr0 |= ev;
315 else
316 mmcr1 |= ev;
317 hwc[event_index[class][i]] = pmc - 1;
318 }
319 }
320
321 if (pmc_inuse & 1)
322 mmcr0 |= MMCR0_PMC1CE;
323 if (pmc_inuse & 0x3e)
324 mmcr0 |= MMCR0_PMCnCE;
325
326 /* Return MMCRx values */
327 mmcr[0] = mmcr0;
328 mmcr[1] = mmcr1;
329 mmcr[2] = mmcr2;
330 return 0;
331}
332
333/*
334 * Disable counting by a PMC.
335 * Note that the pmc argument is 0-based here, not 1-based.
336 */
337static void mpc7450_disable_pmc(unsigned int pmc, unsigned long mmcr[])
338{
339 if (pmc <= 1)
340 mmcr[0] &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]);
341 else
342 mmcr[1] &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]);
343}
344
345static int mpc7450_generic_events[] = {
346 [PERF_COUNT_HW_CPU_CYCLES] = 1,
347 [PERF_COUNT_HW_INSTRUCTIONS] = 2,
348 [PERF_COUNT_HW_CACHE_MISSES] = 0x217, /* PM_L1_DCACHE_MISS */
349 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x122, /* PM_BR_CMPL */
350 [PERF_COUNT_HW_BRANCH_MISSES] = 0x41c, /* PM_BR_MPRED */
351};
352
353#define C(x) PERF_COUNT_HW_CACHE_##x
354
355/*
356 * Table of generalized cache-related events.
357 * 0 means not supported, -1 means nonsensical, other values
358 * are event codes.
359 */
360static int mpc7450_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
361 [C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */
362 [C(OP_READ)] = { 0, 0x225 },
363 [C(OP_WRITE)] = { 0, 0x227 },
364 [C(OP_PREFETCH)] = { 0, 0 },
365 },
366 [C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */
367 [C(OP_READ)] = { 0x129, 0x115 },
368 [C(OP_WRITE)] = { -1, -1 },
369 [C(OP_PREFETCH)] = { 0x634, 0 },
370 },
371 [C(LL)] = { /* RESULT_ACCESS RESULT_MISS */
372 [C(OP_READ)] = { 0, 0 },
373 [C(OP_WRITE)] = { 0, 0 },
374 [C(OP_PREFETCH)] = { 0, 0 },
375 },
376 [C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */
377 [C(OP_READ)] = { 0, 0x312 },
378 [C(OP_WRITE)] = { -1, -1 },
379 [C(OP_PREFETCH)] = { -1, -1 },
380 },
381 [C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */
382 [C(OP_READ)] = { 0, 0x223 },
383 [C(OP_WRITE)] = { -1, -1 },
384 [C(OP_PREFETCH)] = { -1, -1 },
385 },
386 [C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */
387 [C(OP_READ)] = { 0x122, 0x41c },
388 [C(OP_WRITE)] = { -1, -1 },
389 [C(OP_PREFETCH)] = { -1, -1 },
390 },
391 [C(NODE)] = { /* RESULT_ACCESS RESULT_MISS */
392 [C(OP_READ)] = { -1, -1 },
393 [C(OP_WRITE)] = { -1, -1 },
394 [C(OP_PREFETCH)] = { -1, -1 },
395 },
396};
397
398struct power_pmu mpc7450_pmu = {
399 .name = "MPC7450 family",
400 .n_counter = N_COUNTER,
401 .max_alternatives = MAX_ALT,
402 .add_fields = 0x00111555ul,
403 .test_adder = 0x00301000ul,
404 .compute_mmcr = mpc7450_compute_mmcr,
405 .get_constraint = mpc7450_get_constraint,
406 .get_alternatives = mpc7450_get_alternatives,
407 .disable_pmc = mpc7450_disable_pmc,
408 .n_generic = ARRAY_SIZE(mpc7450_generic_events),
409 .generic_events = mpc7450_generic_events,
410 .cache_events = &mpc7450_cache_events,
411};
412
413static int __init init_mpc7450_pmu(void)
414{
415 if (!cur_cpu_spec->oprofile_cpu_type ||
416 strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc/7450"))
417 return -ENODEV;
418
419 return register_power_pmu(&mpc7450_pmu);
420}
421
422early_initcall(init_mpc7450_pmu);