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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/perf_event.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Performance event support for sparc64.
  3  *
  4  * Copyright (C) 2009, 2010 David S. Miller <davem@davemloft.net>
  5  *
  6  * This code is based almost entirely upon the x86 perf event
  7  * code, which is:
  8  *
  9  *  Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
 10  *  Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
 11  *  Copyright (C) 2009 Jaswinder Singh Rajput
 12  *  Copyright (C) 2009 Advanced Micro Devices, Inc., Robert Richter
 13  *  Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra
 14  */
 15 
 16 #include <linux/perf_event.h>
 17 #include <linux/kprobes.h>
 18 #include <linux/ftrace.h>
 19 #include <linux/kernel.h>
 20 #include <linux/kdebug.h>
 21 #include <linux/mutex.h>
 22 
 23 #include <asm/stacktrace.h>
 24 #include <asm/cpudata.h>
 25 #include <linux/uaccess.h>
 26 #include <linux/atomic.h>
 27 #include <linux/sched/clock.h>
 28 #include <asm/nmi.h>
 29 #include <asm/pcr.h>
 30 #include <asm/cacheflush.h>
 31 
 32 #include "kernel.h"
 33 #include "kstack.h"
 34 
 35 /* Two classes of sparc64 chips currently exist.  All of which have
 36  * 32-bit counters which can generate overflow interrupts on the
 37  * transition from 0xffffffff to 0.
 38  *
 39  * All chips upto and including SPARC-T3 have two performance
 40  * counters.  The two 32-bit counters are accessed in one go using a
 41  * single 64-bit register.
 42  *
 43  * On these older chips both counters are controlled using a single
 44  * control register.  The only way to stop all sampling is to clear
 45  * all of the context (user, supervisor, hypervisor) sampling enable
 46  * bits.  But these bits apply to both counters, thus the two counters
 47  * can't be enabled/disabled individually.
 48  *
 49  * Furthermore, the control register on these older chips have two
 50  * event fields, one for each of the two counters.  It's thus nearly
 51  * impossible to have one counter going while keeping the other one
 52  * stopped.  Therefore it is possible to get overflow interrupts for
 53  * counters not currently "in use" and that condition must be checked
 54  * in the overflow interrupt handler.
 55  *
 56  * So we use a hack, in that we program inactive counters with the
 57  * "sw_count0" and "sw_count1" events.  These count how many times
 58  * the instruction "sethi %hi(0xfc000), %g0" is executed.  It's an
 59  * unusual way to encode a NOP and therefore will not trigger in
 60  * normal code.
 61  *
 62  * Starting with SPARC-T4 we have one control register per counter.
 63  * And the counters are stored in individual registers.  The registers
 64  * for the counters are 64-bit but only a 32-bit counter is
 65  * implemented.  The event selections on SPARC-T4 lack any
 66  * restrictions, therefore we can elide all of the complicated
 67  * conflict resolution code we have for SPARC-T3 and earlier chips.
 68  */
 69 
 70 #define MAX_HWEVENTS                    4
 71 #define MAX_PCRS                        4
 72 #define MAX_PERIOD                      ((1UL << 32) - 1)
 73 
 74 #define PIC_UPPER_INDEX                 0
 75 #define PIC_LOWER_INDEX                 1
 76 #define PIC_NO_INDEX                    -1
 77 
 78 struct cpu_hw_events {
 79         /* Number of events currently scheduled onto this cpu.
 80          * This tells how many entries in the arrays below
 81          * are valid.
 82          */
 83         int                     n_events;
 84 
 85         /* Number of new events added since the last hw_perf_disable().
 86          * This works because the perf event layer always adds new
 87          * events inside of a perf_{disable,enable}() sequence.
 88          */
 89         int                     n_added;
 90 
 91         /* Array of events current scheduled on this cpu.  */
 92         struct perf_event       *event[MAX_HWEVENTS];
 93 
 94         /* Array of encoded longs, specifying the %pcr register
 95          * encoding and the mask of PIC counters this even can
 96          * be scheduled on.  See perf_event_encode() et al.
 97          */
 98         unsigned long           events[MAX_HWEVENTS];
 99 
100         /* The current counter index assigned to an event.  When the
101          * event hasn't been programmed into the cpu yet, this will
102          * hold PIC_NO_INDEX.  The event->hw.idx value tells us where
103          * we ought to schedule the event.
104          */
105         int                     current_idx[MAX_HWEVENTS];
106 
107         /* Software copy of %pcr register(s) on this cpu.  */
108         u64                     pcr[MAX_HWEVENTS];
109 
110         /* Enabled/disable state.  */
111         int                     enabled;
112 
113         unsigned int            txn_flags;
114 };
115 static DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = { .enabled = 1, };
116 
117 /* An event map describes the characteristics of a performance
118  * counter event.  In particular it gives the encoding as well as
119  * a mask telling which counters the event can be measured on.
120  *
121  * The mask is unused on SPARC-T4 and later.
122  */
123 struct perf_event_map {
124         u16     encoding;
125         u8      pic_mask;
126 #define PIC_NONE        0x00
127 #define PIC_UPPER       0x01
128 #define PIC_LOWER       0x02
129 };
130 
131 /* Encode a perf_event_map entry into a long.  */
132 static unsigned long perf_event_encode(const struct perf_event_map *pmap)
133 {
134         return ((unsigned long) pmap->encoding << 16) | pmap->pic_mask;
135 }
136 
137 static u8 perf_event_get_msk(unsigned long val)
138 {
139         return val & 0xff;
140 }
141 
142 static u64 perf_event_get_enc(unsigned long val)
143 {
144         return val >> 16;
145 }
146 
147 #define C(x) PERF_COUNT_HW_CACHE_##x
148 
149 #define CACHE_OP_UNSUPPORTED    0xfffe
150 #define CACHE_OP_NONSENSE       0xffff
151 
152 typedef struct perf_event_map cache_map_t
153                                 [PERF_COUNT_HW_CACHE_MAX]
154                                 [PERF_COUNT_HW_CACHE_OP_MAX]
155                                 [PERF_COUNT_HW_CACHE_RESULT_MAX];
156 
157 struct sparc_pmu {
158         const struct perf_event_map     *(*event_map)(int);
159         const cache_map_t               *cache_map;
160         int                             max_events;
161         u32                             (*read_pmc)(int);
162         void                            (*write_pmc)(int, u64);
163         int                             upper_shift;
164         int                             lower_shift;
165         int                             event_mask;
166         int                             user_bit;
167         int                             priv_bit;
168         int                             hv_bit;
169         int                             irq_bit;
170         int                             upper_nop;
171         int                             lower_nop;
172         unsigned int                    flags;
173 #define SPARC_PMU_ALL_EXCLUDES_SAME     0x00000001
174 #define SPARC_PMU_HAS_CONFLICTS         0x00000002
175         int                             max_hw_events;
176         int                             num_pcrs;
177         int                             num_pic_regs;
178 };
179 
180 static u32 sparc_default_read_pmc(int idx)
181 {
182         u64 val;
183 
184         val = pcr_ops->read_pic(0);
185         if (idx == PIC_UPPER_INDEX)
186                 val >>= 32;
187 
188         return val & 0xffffffff;
189 }
190 
191 static void sparc_default_write_pmc(int idx, u64 val)
192 {
193         u64 shift, mask, pic;
194 
195         shift = 0;
196         if (idx == PIC_UPPER_INDEX)
197                 shift = 32;
198 
199         mask = ((u64) 0xffffffff) << shift;
200         val <<= shift;
201 
202         pic = pcr_ops->read_pic(0);
203         pic &= ~mask;
204         pic |= val;
205         pcr_ops->write_pic(0, pic);
206 }
207 
208 static const struct perf_event_map ultra3_perfmon_event_map[] = {
209         [PERF_COUNT_HW_CPU_CYCLES] = { 0x0000, PIC_UPPER | PIC_LOWER },
210         [PERF_COUNT_HW_INSTRUCTIONS] = { 0x0001, PIC_UPPER | PIC_LOWER },
211         [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0009, PIC_LOWER },
212         [PERF_COUNT_HW_CACHE_MISSES] = { 0x0009, PIC_UPPER },
213 };
214 
215 static const struct perf_event_map *ultra3_event_map(int event_id)
216 {
217         return &ultra3_perfmon_event_map[event_id];
218 }
219 
220 static const cache_map_t ultra3_cache_map = {
221 [C(L1D)] = {
222         [C(OP_READ)] = {
223                 [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, },
224                 [C(RESULT_MISS)] = { 0x09, PIC_UPPER, },
225         },
226         [C(OP_WRITE)] = {
227                 [C(RESULT_ACCESS)] = { 0x0a, PIC_LOWER },
228                 [C(RESULT_MISS)] = { 0x0a, PIC_UPPER },
229         },
230         [C(OP_PREFETCH)] = {
231                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
232                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
233         },
234 },
235 [C(L1I)] = {
236         [C(OP_READ)] = {
237                 [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, },
238                 [C(RESULT_MISS)] = { 0x09, PIC_UPPER, },
239         },
240         [ C(OP_WRITE) ] = {
241                 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
242                 [ C(RESULT_MISS)   ] = { CACHE_OP_NONSENSE },
243         },
244         [ C(OP_PREFETCH) ] = {
245                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
246                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
247         },
248 },
249 [C(LL)] = {
250         [C(OP_READ)] = {
251                 [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER, },
252                 [C(RESULT_MISS)] = { 0x0c, PIC_UPPER, },
253         },
254         [C(OP_WRITE)] = {
255                 [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER },
256                 [C(RESULT_MISS)] = { 0x0c, PIC_UPPER },
257         },
258         [C(OP_PREFETCH)] = {
259                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
260                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
261         },
262 },
263 [C(DTLB)] = {
264         [C(OP_READ)] = {
265                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
266                 [C(RESULT_MISS)] = { 0x12, PIC_UPPER, },
267         },
268         [ C(OP_WRITE) ] = {
269                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
270                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
271         },
272         [ C(OP_PREFETCH) ] = {
273                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
274                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
275         },
276 },
277 [C(ITLB)] = {
278         [C(OP_READ)] = {
279                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
280                 [C(RESULT_MISS)] = { 0x11, PIC_UPPER, },
281         },
282         [ C(OP_WRITE) ] = {
283                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
284                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
285         },
286         [ C(OP_PREFETCH) ] = {
287                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
288                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
289         },
290 },
291 [C(BPU)] = {
292         [C(OP_READ)] = {
293                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
294                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
295         },
296         [ C(OP_WRITE) ] = {
297                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
298                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
299         },
300         [ C(OP_PREFETCH) ] = {
301                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
302                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
303         },
304 },
305 [C(NODE)] = {
306         [C(OP_READ)] = {
307                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
308                 [C(RESULT_MISS)  ] = { CACHE_OP_UNSUPPORTED },
309         },
310         [ C(OP_WRITE) ] = {
311                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
312                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
313         },
314         [ C(OP_PREFETCH) ] = {
315                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
316                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
317         },
318 },
319 };
320 
321 static const struct sparc_pmu ultra3_pmu = {
322         .event_map      = ultra3_event_map,
323         .cache_map      = &ultra3_cache_map,
324         .max_events     = ARRAY_SIZE(ultra3_perfmon_event_map),
325         .read_pmc       = sparc_default_read_pmc,
326         .write_pmc      = sparc_default_write_pmc,
327         .upper_shift    = 11,
328         .lower_shift    = 4,
329         .event_mask     = 0x3f,
330         .user_bit       = PCR_UTRACE,
331         .priv_bit       = PCR_STRACE,
332         .upper_nop      = 0x1c,
333         .lower_nop      = 0x14,
334         .flags          = (SPARC_PMU_ALL_EXCLUDES_SAME |
335                            SPARC_PMU_HAS_CONFLICTS),
336         .max_hw_events  = 2,
337         .num_pcrs       = 1,
338         .num_pic_regs   = 1,
339 };
340 
341 /* Niagara1 is very limited.  The upper PIC is hard-locked to count
342  * only instructions, so it is free running which creates all kinds of
343  * problems.  Some hardware designs make one wonder if the creator
344  * even looked at how this stuff gets used by software.
345  */
346 static const struct perf_event_map niagara1_perfmon_event_map[] = {
347         [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, PIC_UPPER },
348         [PERF_COUNT_HW_INSTRUCTIONS] = { 0x00, PIC_UPPER },
349         [PERF_COUNT_HW_CACHE_REFERENCES] = { 0, PIC_NONE },
350         [PERF_COUNT_HW_CACHE_MISSES] = { 0x03, PIC_LOWER },
351 };
352 
353 static const struct perf_event_map *niagara1_event_map(int event_id)
354 {
355         return &niagara1_perfmon_event_map[event_id];
356 }
357 
358 static const cache_map_t niagara1_cache_map = {
359 [C(L1D)] = {
360         [C(OP_READ)] = {
361                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
362                 [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
363         },
364         [C(OP_WRITE)] = {
365                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
366                 [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
367         },
368         [C(OP_PREFETCH)] = {
369                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
370                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
371         },
372 },
373 [C(L1I)] = {
374         [C(OP_READ)] = {
375                 [C(RESULT_ACCESS)] = { 0x00, PIC_UPPER },
376                 [C(RESULT_MISS)] = { 0x02, PIC_LOWER, },
377         },
378         [ C(OP_WRITE) ] = {
379                 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
380                 [ C(RESULT_MISS)   ] = { CACHE_OP_NONSENSE },
381         },
382         [ C(OP_PREFETCH) ] = {
383                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
384                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
385         },
386 },
387 [C(LL)] = {
388         [C(OP_READ)] = {
389                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
390                 [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
391         },
392         [C(OP_WRITE)] = {
393                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
394                 [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
395         },
396         [C(OP_PREFETCH)] = {
397                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
398                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
399         },
400 },
401 [C(DTLB)] = {
402         [C(OP_READ)] = {
403                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
404                 [C(RESULT_MISS)] = { 0x05, PIC_LOWER, },
405         },
406         [ C(OP_WRITE) ] = {
407                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
408                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
409         },
410         [ C(OP_PREFETCH) ] = {
411                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
412                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
413         },
414 },
415 [C(ITLB)] = {
416         [C(OP_READ)] = {
417                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
418                 [C(RESULT_MISS)] = { 0x04, PIC_LOWER, },
419         },
420         [ C(OP_WRITE) ] = {
421                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
422                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
423         },
424         [ C(OP_PREFETCH) ] = {
425                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
426                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
427         },
428 },
429 [C(BPU)] = {
430         [C(OP_READ)] = {
431                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
432                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
433         },
434         [ C(OP_WRITE) ] = {
435                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
436                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
437         },
438         [ C(OP_PREFETCH) ] = {
439                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
440                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
441         },
442 },
443 [C(NODE)] = {
444         [C(OP_READ)] = {
445                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
446                 [C(RESULT_MISS)  ] = { CACHE_OP_UNSUPPORTED },
447         },
448         [ C(OP_WRITE) ] = {
449                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
450                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
451         },
452         [ C(OP_PREFETCH) ] = {
453                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
454                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
455         },
456 },
457 };
458 
459 static const struct sparc_pmu niagara1_pmu = {
460         .event_map      = niagara1_event_map,
461         .cache_map      = &niagara1_cache_map,
462         .max_events     = ARRAY_SIZE(niagara1_perfmon_event_map),
463         .read_pmc       = sparc_default_read_pmc,
464         .write_pmc      = sparc_default_write_pmc,
465         .upper_shift    = 0,
466         .lower_shift    = 4,
467         .event_mask     = 0x7,
468         .user_bit       = PCR_UTRACE,
469         .priv_bit       = PCR_STRACE,
470         .upper_nop      = 0x0,
471         .lower_nop      = 0x0,
472         .flags          = (SPARC_PMU_ALL_EXCLUDES_SAME |
473                            SPARC_PMU_HAS_CONFLICTS),
474         .max_hw_events  = 2,
475         .num_pcrs       = 1,
476         .num_pic_regs   = 1,
477 };
478 
479 static const struct perf_event_map niagara2_perfmon_event_map[] = {
480         [PERF_COUNT_HW_CPU_CYCLES] = { 0x02ff, PIC_UPPER | PIC_LOWER },
481         [PERF_COUNT_HW_INSTRUCTIONS] = { 0x02ff, PIC_UPPER | PIC_LOWER },
482         [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0208, PIC_UPPER | PIC_LOWER },
483         [PERF_COUNT_HW_CACHE_MISSES] = { 0x0302, PIC_UPPER | PIC_LOWER },
484         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x0201, PIC_UPPER | PIC_LOWER },
485         [PERF_COUNT_HW_BRANCH_MISSES] = { 0x0202, PIC_UPPER | PIC_LOWER },
486 };
487 
488 static const struct perf_event_map *niagara2_event_map(int event_id)
489 {
490         return &niagara2_perfmon_event_map[event_id];
491 }
492 
493 static const cache_map_t niagara2_cache_map = {
494 [C(L1D)] = {
495         [C(OP_READ)] = {
496                 [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, },
497                 [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, },
498         },
499         [C(OP_WRITE)] = {
500                 [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, },
501                 [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, },
502         },
503         [C(OP_PREFETCH)] = {
504                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
505                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
506         },
507 },
508 [C(L1I)] = {
509         [C(OP_READ)] = {
510                 [C(RESULT_ACCESS)] = { 0x02ff, PIC_UPPER | PIC_LOWER, },
511                 [C(RESULT_MISS)] = { 0x0301, PIC_UPPER | PIC_LOWER, },
512         },
513         [ C(OP_WRITE) ] = {
514                 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
515                 [ C(RESULT_MISS)   ] = { CACHE_OP_NONSENSE },
516         },
517         [ C(OP_PREFETCH) ] = {
518                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
519                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
520         },
521 },
522 [C(LL)] = {
523         [C(OP_READ)] = {
524                 [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, },
525                 [C(RESULT_MISS)] = { 0x0330, PIC_UPPER | PIC_LOWER, },
526         },
527         [C(OP_WRITE)] = {
528                 [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, },
529                 [C(RESULT_MISS)] = { 0x0320, PIC_UPPER | PIC_LOWER, },
530         },
531         [C(OP_PREFETCH)] = {
532                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
533                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
534         },
535 },
536 [C(DTLB)] = {
537         [C(OP_READ)] = {
538                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
539                 [C(RESULT_MISS)] = { 0x0b08, PIC_UPPER | PIC_LOWER, },
540         },
541         [ C(OP_WRITE) ] = {
542                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
543                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
544         },
545         [ C(OP_PREFETCH) ] = {
546                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
547                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
548         },
549 },
550 [C(ITLB)] = {
551         [C(OP_READ)] = {
552                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
553                 [C(RESULT_MISS)] = { 0xb04, PIC_UPPER | PIC_LOWER, },
554         },
555         [ C(OP_WRITE) ] = {
556                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
557                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
558         },
559         [ C(OP_PREFETCH) ] = {
560                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
561                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
562         },
563 },
564 [C(BPU)] = {
565         [C(OP_READ)] = {
566                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
567                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
568         },
569         [ C(OP_WRITE) ] = {
570                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
571                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
572         },
573         [ C(OP_PREFETCH) ] = {
574                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
575                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
576         },
577 },
578 [C(NODE)] = {
579         [C(OP_READ)] = {
580                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
581                 [C(RESULT_MISS)  ] = { CACHE_OP_UNSUPPORTED },
582         },
583         [ C(OP_WRITE) ] = {
584                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
585                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
586         },
587         [ C(OP_PREFETCH) ] = {
588                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
589                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
590         },
591 },
592 };
593 
594 static const struct sparc_pmu niagara2_pmu = {
595         .event_map      = niagara2_event_map,
596         .cache_map      = &niagara2_cache_map,
597         .max_events     = ARRAY_SIZE(niagara2_perfmon_event_map),
598         .read_pmc       = sparc_default_read_pmc,
599         .write_pmc      = sparc_default_write_pmc,
600         .upper_shift    = 19,
601         .lower_shift    = 6,
602         .event_mask     = 0xfff,
603         .user_bit       = PCR_UTRACE,
604         .priv_bit       = PCR_STRACE,
605         .hv_bit         = PCR_N2_HTRACE,
606         .irq_bit        = 0x30,
607         .upper_nop      = 0x220,
608         .lower_nop      = 0x220,
609         .flags          = (SPARC_PMU_ALL_EXCLUDES_SAME |
610                            SPARC_PMU_HAS_CONFLICTS),
611         .max_hw_events  = 2,
612         .num_pcrs       = 1,
613         .num_pic_regs   = 1,
614 };
615 
616 static const struct perf_event_map niagara4_perfmon_event_map[] = {
617         [PERF_COUNT_HW_CPU_CYCLES] = { (26 << 6) },
618         [PERF_COUNT_HW_INSTRUCTIONS] = { (3 << 6) | 0x3f },
619         [PERF_COUNT_HW_CACHE_REFERENCES] = { (3 << 6) | 0x04 },
620         [PERF_COUNT_HW_CACHE_MISSES] = { (16 << 6) | 0x07 },
621         [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { (4 << 6) | 0x01 },
622         [PERF_COUNT_HW_BRANCH_MISSES] = { (25 << 6) | 0x0f },
623 };
624 
625 static const struct perf_event_map *niagara4_event_map(int event_id)
626 {
627         return &niagara4_perfmon_event_map[event_id];
628 }
629 
630 static const cache_map_t niagara4_cache_map = {
631 [C(L1D)] = {
632         [C(OP_READ)] = {
633                 [C(RESULT_ACCESS)] = { (3 << 6) | 0x04 },
634                 [C(RESULT_MISS)] = { (16 << 6) | 0x07 },
635         },
636         [C(OP_WRITE)] = {
637                 [C(RESULT_ACCESS)] = { (3 << 6) | 0x08 },
638                 [C(RESULT_MISS)] = { (16 << 6) | 0x07 },
639         },
640         [C(OP_PREFETCH)] = {
641                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
642                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
643         },
644 },
645 [C(L1I)] = {
646         [C(OP_READ)] = {
647                 [C(RESULT_ACCESS)] = { (3 << 6) | 0x3f },
648                 [C(RESULT_MISS)] = { (11 << 6) | 0x03 },
649         },
650         [ C(OP_WRITE) ] = {
651                 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
652                 [ C(RESULT_MISS)   ] = { CACHE_OP_NONSENSE },
653         },
654         [ C(OP_PREFETCH) ] = {
655                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
656                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
657         },
658 },
659 [C(LL)] = {
660         [C(OP_READ)] = {
661                 [C(RESULT_ACCESS)] = { (3 << 6) | 0x04 },
662                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
663         },
664         [C(OP_WRITE)] = {
665                 [C(RESULT_ACCESS)] = { (3 << 6) | 0x08 },
666                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
667         },
668         [C(OP_PREFETCH)] = {
669                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
670                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
671         },
672 },
673 [C(DTLB)] = {
674         [C(OP_READ)] = {
675                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
676                 [C(RESULT_MISS)] = { (17 << 6) | 0x3f },
677         },
678         [ C(OP_WRITE) ] = {
679                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
680                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
681         },
682         [ C(OP_PREFETCH) ] = {
683                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
684                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
685         },
686 },
687 [C(ITLB)] = {
688         [C(OP_READ)] = {
689                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
690                 [C(RESULT_MISS)] = { (6 << 6) | 0x3f },
691         },
692         [ C(OP_WRITE) ] = {
693                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
694                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
695         },
696         [ C(OP_PREFETCH) ] = {
697                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
698                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
699         },
700 },
701 [C(BPU)] = {
702         [C(OP_READ)] = {
703                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
704                 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
705         },
706         [ C(OP_WRITE) ] = {
707                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
708                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
709         },
710         [ C(OP_PREFETCH) ] = {
711                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
712                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
713         },
714 },
715 [C(NODE)] = {
716         [C(OP_READ)] = {
717                 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
718                 [C(RESULT_MISS)  ] = { CACHE_OP_UNSUPPORTED },
719         },
720         [ C(OP_WRITE) ] = {
721                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
722                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
723         },
724         [ C(OP_PREFETCH) ] = {
725                 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
726                 [ C(RESULT_MISS)   ] = { CACHE_OP_UNSUPPORTED },
727         },
728 },
729 };
730 
731 static u32 sparc_vt_read_pmc(int idx)
732 {
733         u64 val = pcr_ops->read_pic(idx);
734 
735         return val & 0xffffffff;
736 }
737 
738 static void sparc_vt_write_pmc(int idx, u64 val)
739 {
740         u64 pcr;
741 
742         pcr = pcr_ops->read_pcr(idx);
743         /* ensure ov and ntc are reset */
744         pcr &= ~(PCR_N4_OV | PCR_N4_NTC);
745 
746         pcr_ops->write_pic(idx, val & 0xffffffff);
747 
748         pcr_ops->write_pcr(idx, pcr);
749 }
750 
751 static const struct sparc_pmu niagara4_pmu = {
752         .event_map      = niagara4_event_map,
753         .cache_map      = &niagara4_cache_map,
754         .max_events     = ARRAY_SIZE(niagara4_perfmon_event_map),
755         .read_pmc       = sparc_vt_read_pmc,
756         .write_pmc      = sparc_vt_write_pmc,
757         .upper_shift    = 5,
758         .lower_shift    = 5,
759         .event_mask     = 0x7ff,
760         .user_bit       = PCR_N4_UTRACE,
761         .priv_bit       = PCR_N4_STRACE,
762 
763         /* We explicitly don't support hypervisor tracing.  The T4
764          * generates the overflow event for precise events via a trap
765          * which will not be generated (ie. it's completely lost) if
766          * we happen to be in the hypervisor when the event triggers.
767          * Essentially, the overflow event reporting is completely
768          * unusable when you have hypervisor mode tracing enabled.
769          */
770         .hv_bit         = 0,
771 
772         .irq_bit        = PCR_N4_TOE,
773         .upper_nop      = 0,
774         .lower_nop      = 0,
775         .flags          = 0,
776         .max_hw_events  = 4,
777         .num_pcrs       = 4,
778         .num_pic_regs   = 4,
779 };
780 
781 static const struct sparc_pmu sparc_m7_pmu = {
782         .event_map      = niagara4_event_map,
783         .cache_map      = &niagara4_cache_map,
784         .max_events     = ARRAY_SIZE(niagara4_perfmon_event_map),
785         .read_pmc       = sparc_vt_read_pmc,
786         .write_pmc      = sparc_vt_write_pmc,
787         .upper_shift    = 5,
788         .lower_shift    = 5,
789         .event_mask     = 0x7ff,
790         .user_bit       = PCR_N4_UTRACE,
791         .priv_bit       = PCR_N4_STRACE,
792 
793         /* We explicitly don't support hypervisor tracing. */
794         .hv_bit         = 0,
795 
796         .irq_bit        = PCR_N4_TOE,
797         .upper_nop      = 0,
798         .lower_nop      = 0,
799         .flags          = 0,
800         .max_hw_events  = 4,
801         .num_pcrs       = 4,
802         .num_pic_regs   = 4,
803 };
804 static const struct sparc_pmu *sparc_pmu __read_mostly;
805 
806 static u64 event_encoding(u64 event_id, int idx)
807 {
808         if (idx == PIC_UPPER_INDEX)
809                 event_id <<= sparc_pmu->upper_shift;
810         else
811                 event_id <<= sparc_pmu->lower_shift;
812         return event_id;
813 }
814 
815 static u64 mask_for_index(int idx)
816 {
817         return event_encoding(sparc_pmu->event_mask, idx);
818 }
819 
820 static u64 nop_for_index(int idx)
821 {
822         return event_encoding(idx == PIC_UPPER_INDEX ?
823                               sparc_pmu->upper_nop :
824                               sparc_pmu->lower_nop, idx);
825 }
826 
827 static inline void sparc_pmu_enable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
828 {
829         u64 enc, val, mask = mask_for_index(idx);
830         int pcr_index = 0;
831 
832         if (sparc_pmu->num_pcrs > 1)
833                 pcr_index = idx;
834 
835         enc = perf_event_get_enc(cpuc->events[idx]);
836 
837         val = cpuc->pcr[pcr_index];
838         val &= ~mask;
839         val |= event_encoding(enc, idx);
840         cpuc->pcr[pcr_index] = val;
841 
842         pcr_ops->write_pcr(pcr_index, cpuc->pcr[pcr_index]);
843 }
844 
845 static inline void sparc_pmu_disable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
846 {
847         u64 mask = mask_for_index(idx);
848         u64 nop = nop_for_index(idx);
849         int pcr_index = 0;
850         u64 val;
851 
852         if (sparc_pmu->num_pcrs > 1)
853                 pcr_index = idx;
854 
855         val = cpuc->pcr[pcr_index];
856         val &= ~mask;
857         val |= nop;
858         cpuc->pcr[pcr_index] = val;
859 
860         pcr_ops->write_pcr(pcr_index, cpuc->pcr[pcr_index]);
861 }
862 
863 static u64 sparc_perf_event_update(struct perf_event *event,
864                                    struct hw_perf_event *hwc, int idx)
865 {
866         int shift = 64 - 32;
867         u64 prev_raw_count, new_raw_count;
868         s64 delta;
869 
870 again:
871         prev_raw_count = local64_read(&hwc->prev_count);
872         new_raw_count = sparc_pmu->read_pmc(idx);
873 
874         if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
875                              new_raw_count) != prev_raw_count)
876                 goto again;
877 
878         delta = (new_raw_count << shift) - (prev_raw_count << shift);
879         delta >>= shift;
880 
881         local64_add(delta, &event->count);
882         local64_sub(delta, &hwc->period_left);
883 
884         return new_raw_count;
885 }
886 
887 static int sparc_perf_event_set_period(struct perf_event *event,
888                                        struct hw_perf_event *hwc, int idx)
889 {
890         s64 left = local64_read(&hwc->period_left);
891         s64 period = hwc->sample_period;
892         int ret = 0;
893 
894         if (unlikely(left <= -period)) {
895                 left = period;
896                 local64_set(&hwc->period_left, left);
897                 hwc->last_period = period;
898                 ret = 1;
899         }
900 
901         if (unlikely(left <= 0)) {
902                 left += period;
903                 local64_set(&hwc->period_left, left);
904                 hwc->last_period = period;
905                 ret = 1;
906         }
907         if (left > MAX_PERIOD)
908                 left = MAX_PERIOD;
909 
910         local64_set(&hwc->prev_count, (u64)-left);
911 
912         sparc_pmu->write_pmc(idx, (u64)(-left) & 0xffffffff);
913 
914         perf_event_update_userpage(event);
915 
916         return ret;
917 }
918 
919 static void read_in_all_counters(struct cpu_hw_events *cpuc)
920 {
921         int i;
922 
923         for (i = 0; i < cpuc->n_events; i++) {
924                 struct perf_event *cp = cpuc->event[i];
925 
926                 if (cpuc->current_idx[i] != PIC_NO_INDEX &&
927                     cpuc->current_idx[i] != cp->hw.idx) {
928                         sparc_perf_event_update(cp, &cp->hw,
929                                                 cpuc->current_idx[i]);
930                         cpuc->current_idx[i] = PIC_NO_INDEX;
931                         if (cp->hw.state & PERF_HES_STOPPED)
932                                 cp->hw.state |= PERF_HES_ARCH;
933                 }
934         }
935 }
936 
937 /* On this PMU all PICs are programmed using a single PCR.  Calculate
938  * the combined control register value.
939  *
940  * For such chips we require that all of the events have the same
941  * configuration, so just fetch the settings from the first entry.
942  */
943 static void calculate_single_pcr(struct cpu_hw_events *cpuc)
944 {
945         int i;
946 
947         if (!cpuc->n_added)
948                 goto out;
949 
950         /* Assign to counters all unassigned events.  */
951         for (i = 0; i < cpuc->n_events; i++) {
952                 struct perf_event *cp = cpuc->event[i];
953                 struct hw_perf_event *hwc = &cp->hw;
954                 int idx = hwc->idx;
955                 u64 enc;
956 
957                 if (cpuc->current_idx[i] != PIC_NO_INDEX)
958                         continue;
959 
960                 sparc_perf_event_set_period(cp, hwc, idx);
961                 cpuc->current_idx[i] = idx;
962 
963                 enc = perf_event_get_enc(cpuc->events[i]);
964                 cpuc->pcr[0] &= ~mask_for_index(idx);
965                 if (hwc->state & PERF_HES_ARCH) {
966                         cpuc->pcr[0] |= nop_for_index(idx);
967                 } else {
968                         cpuc->pcr[0] |= event_encoding(enc, idx);
969                         hwc->state = 0;
970                 }
971         }
972 out:
973         cpuc->pcr[0] |= cpuc->event[0]->hw.config_base;
974 }
975 
976 static void sparc_pmu_start(struct perf_event *event, int flags);
977 
978 /* On this PMU each PIC has it's own PCR control register.  */
979 static void calculate_multiple_pcrs(struct cpu_hw_events *cpuc)
980 {
981         int i;
982 
983         if (!cpuc->n_added)
984                 goto out;
985 
986         for (i = 0; i < cpuc->n_events; i++) {
987                 struct perf_event *cp = cpuc->event[i];
988                 struct hw_perf_event *hwc = &cp->hw;
989                 int idx = hwc->idx;
990 
991                 if (cpuc->current_idx[i] != PIC_NO_INDEX)
992                         continue;
993 
994                 cpuc->current_idx[i] = idx;
995 
996                 if (cp->hw.state & PERF_HES_ARCH)
997                         continue;
998 
999                 sparc_pmu_start(cp, PERF_EF_RELOAD);
1000         }
1001 out:
1002         for (i = 0; i < cpuc->n_events; i++) {
1003                 struct perf_event *cp = cpuc->event[i];
1004                 int idx = cp->hw.idx;
1005 
1006                 cpuc->pcr[idx] |= cp->hw.config_base;
1007         }
1008 }
1009 
1010 /* If performance event entries have been added, move existing events
1011  * around (if necessary) and then assign new entries to counters.
1012  */
1013 static void update_pcrs_for_enable(struct cpu_hw_events *cpuc)
1014 {
1015         if (cpuc->n_added)
1016                 read_in_all_counters(cpuc);
1017 
1018         if (sparc_pmu->num_pcrs == 1) {
1019                 calculate_single_pcr(cpuc);
1020         } else {
1021                 calculate_multiple_pcrs(cpuc);
1022         }
1023 }
1024 
1025 static void sparc_pmu_enable(struct pmu *pmu)
1026 {
1027         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1028         int i;
1029 
1030         if (cpuc->enabled)
1031                 return;
1032 
1033         cpuc->enabled = 1;
1034         barrier();
1035 
1036         if (cpuc->n_events)
1037                 update_pcrs_for_enable(cpuc);
1038 
1039         for (i = 0; i < sparc_pmu->num_pcrs; i++)
1040                 pcr_ops->write_pcr(i, cpuc->pcr[i]);
1041 }
1042 
1043 static void sparc_pmu_disable(struct pmu *pmu)
1044 {
1045         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1046         int i;
1047 
1048         if (!cpuc->enabled)
1049                 return;
1050 
1051         cpuc->enabled = 0;
1052         cpuc->n_added = 0;
1053 
1054         for (i = 0; i < sparc_pmu->num_pcrs; i++) {
1055                 u64 val = cpuc->pcr[i];
1056 
1057                 val &= ~(sparc_pmu->user_bit | sparc_pmu->priv_bit |
1058                          sparc_pmu->hv_bit | sparc_pmu->irq_bit);
1059                 cpuc->pcr[i] = val;
1060                 pcr_ops->write_pcr(i, cpuc->pcr[i]);
1061         }
1062 }
1063 
1064 static int active_event_index(struct cpu_hw_events *cpuc,
1065                               struct perf_event *event)
1066 {
1067         int i;
1068 
1069         for (i = 0; i < cpuc->n_events; i++) {
1070                 if (cpuc->event[i] == event)
1071                         break;
1072         }
1073         BUG_ON(i == cpuc->n_events);
1074         return cpuc->current_idx[i];
1075 }
1076 
1077 static void sparc_pmu_start(struct perf_event *event, int flags)
1078 {
1079         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1080         int idx = active_event_index(cpuc, event);
1081 
1082         if (flags & PERF_EF_RELOAD) {
1083                 WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE));
1084                 sparc_perf_event_set_period(event, &event->hw, idx);
1085         }
1086 
1087         event->hw.state = 0;
1088 
1089         sparc_pmu_enable_event(cpuc, &event->hw, idx);
1090 
1091         perf_event_update_userpage(event);
1092 }
1093 
1094 static void sparc_pmu_stop(struct perf_event *event, int flags)
1095 {
1096         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1097         int idx = active_event_index(cpuc, event);
1098 
1099         if (!(event->hw.state & PERF_HES_STOPPED)) {
1100                 sparc_pmu_disable_event(cpuc, &event->hw, idx);
1101                 event->hw.state |= PERF_HES_STOPPED;
1102         }
1103 
1104         if (!(event->hw.state & PERF_HES_UPTODATE) && (flags & PERF_EF_UPDATE)) {
1105                 sparc_perf_event_update(event, &event->hw, idx);
1106                 event->hw.state |= PERF_HES_UPTODATE;
1107         }
1108 }
1109 
1110 static void sparc_pmu_del(struct perf_event *event, int _flags)
1111 {
1112         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1113         unsigned long flags;
1114         int i;
1115 
1116         local_irq_save(flags);
1117 
1118         for (i = 0; i < cpuc->n_events; i++) {
1119                 if (event == cpuc->event[i]) {
1120                         /* Absorb the final count and turn off the
1121                          * event.
1122                          */
1123                         sparc_pmu_stop(event, PERF_EF_UPDATE);
1124 
1125                         /* Shift remaining entries down into
1126                          * the existing slot.
1127                          */
1128                         while (++i < cpuc->n_events) {
1129                                 cpuc->event[i - 1] = cpuc->event[i];
1130                                 cpuc->events[i - 1] = cpuc->events[i];
1131                                 cpuc->current_idx[i - 1] =
1132                                         cpuc->current_idx[i];
1133                         }
1134 
1135                         perf_event_update_userpage(event);
1136 
1137                         cpuc->n_events--;
1138                         break;
1139                 }
1140         }
1141 
1142         local_irq_restore(flags);
1143 }
1144 
1145 static void sparc_pmu_read(struct perf_event *event)
1146 {
1147         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1148         int idx = active_event_index(cpuc, event);
1149         struct hw_perf_event *hwc = &event->hw;
1150 
1151         sparc_perf_event_update(event, hwc, idx);
1152 }
1153 
1154 static atomic_t active_events = ATOMIC_INIT(0);
1155 static DEFINE_MUTEX(pmc_grab_mutex);
1156 
1157 static void perf_stop_nmi_watchdog(void *unused)
1158 {
1159         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1160         int i;
1161 
1162         stop_nmi_watchdog(NULL);
1163         for (i = 0; i < sparc_pmu->num_pcrs; i++)
1164                 cpuc->pcr[i] = pcr_ops->read_pcr(i);
1165 }
1166 
1167 static void perf_event_grab_pmc(void)
1168 {
1169         if (atomic_inc_not_zero(&active_events))
1170                 return;
1171 
1172         mutex_lock(&pmc_grab_mutex);
1173         if (atomic_read(&active_events) == 0) {
1174                 if (atomic_read(&nmi_active) > 0) {
1175                         on_each_cpu(perf_stop_nmi_watchdog, NULL, 1);
1176                         BUG_ON(atomic_read(&nmi_active) != 0);
1177                 }
1178                 atomic_inc(&active_events);
1179         }
1180         mutex_unlock(&pmc_grab_mutex);
1181 }
1182 
1183 static void perf_event_release_pmc(void)
1184 {
1185         if (atomic_dec_and_mutex_lock(&active_events, &pmc_grab_mutex)) {
1186                 if (atomic_read(&nmi_active) == 0)
1187                         on_each_cpu(start_nmi_watchdog, NULL, 1);
1188                 mutex_unlock(&pmc_grab_mutex);
1189         }
1190 }
1191 
1192 static const struct perf_event_map *sparc_map_cache_event(u64 config)
1193 {
1194         unsigned int cache_type, cache_op, cache_result;
1195         const struct perf_event_map *pmap;
1196 
1197         if (!sparc_pmu->cache_map)
1198                 return ERR_PTR(-ENOENT);
1199 
1200         cache_type = (config >>  0) & 0xff;
1201         if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
1202                 return ERR_PTR(-EINVAL);
1203 
1204         cache_op = (config >>  8) & 0xff;
1205         if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
1206                 return ERR_PTR(-EINVAL);
1207 
1208         cache_result = (config >> 16) & 0xff;
1209         if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
1210                 return ERR_PTR(-EINVAL);
1211 
1212         pmap = &((*sparc_pmu->cache_map)[cache_type][cache_op][cache_result]);
1213 
1214         if (pmap->encoding == CACHE_OP_UNSUPPORTED)
1215                 return ERR_PTR(-ENOENT);
1216 
1217         if (pmap->encoding == CACHE_OP_NONSENSE)
1218                 return ERR_PTR(-EINVAL);
1219 
1220         return pmap;
1221 }
1222 
1223 static void hw_perf_event_destroy(struct perf_event *event)
1224 {
1225         perf_event_release_pmc();
1226 }
1227 
1228 /* Make sure all events can be scheduled into the hardware at
1229  * the same time.  This is simplified by the fact that we only
1230  * need to support 2 simultaneous HW events.
1231  *
1232  * As a side effect, the evts[]->hw.idx values will be assigned
1233  * on success.  These are pending indexes.  When the events are
1234  * actually programmed into the chip, these values will propagate
1235  * to the per-cpu cpuc->current_idx[] slots, see the code in
1236  * maybe_change_configuration() for details.
1237  */
1238 static int sparc_check_constraints(struct perf_event **evts,
1239                                    unsigned long *events, int n_ev)
1240 {
1241         u8 msk0 = 0, msk1 = 0;
1242         int idx0 = 0;
1243 
1244         /* This case is possible when we are invoked from
1245          * hw_perf_group_sched_in().
1246          */
1247         if (!n_ev)
1248                 return 0;
1249 
1250         if (n_ev > sparc_pmu->max_hw_events)
1251                 return -1;
1252 
1253         if (!(sparc_pmu->flags & SPARC_PMU_HAS_CONFLICTS)) {
1254                 int i;
1255 
1256                 for (i = 0; i < n_ev; i++)
1257                         evts[i]->hw.idx = i;
1258                 return 0;
1259         }
1260 
1261         msk0 = perf_event_get_msk(events[0]);
1262         if (n_ev == 1) {
1263                 if (msk0 & PIC_LOWER)
1264                         idx0 = 1;
1265                 goto success;
1266         }
1267         BUG_ON(n_ev != 2);
1268         msk1 = perf_event_get_msk(events[1]);
1269 
1270         /* If both events can go on any counter, OK.  */
1271         if (msk0 == (PIC_UPPER | PIC_LOWER) &&
1272             msk1 == (PIC_UPPER | PIC_LOWER))
1273                 goto success;
1274 
1275         /* If one event is limited to a specific counter,
1276          * and the other can go on both, OK.
1277          */
1278         if ((msk0 == PIC_UPPER || msk0 == PIC_LOWER) &&
1279             msk1 == (PIC_UPPER | PIC_LOWER)) {
1280                 if (msk0 & PIC_LOWER)
1281                         idx0 = 1;
1282                 goto success;
1283         }
1284 
1285         if ((msk1 == PIC_UPPER || msk1 == PIC_LOWER) &&
1286             msk0 == (PIC_UPPER | PIC_LOWER)) {
1287                 if (msk1 & PIC_UPPER)
1288                         idx0 = 1;
1289                 goto success;
1290         }
1291 
1292         /* If the events are fixed to different counters, OK.  */
1293         if ((msk0 == PIC_UPPER && msk1 == PIC_LOWER) ||
1294             (msk0 == PIC_LOWER && msk1 == PIC_UPPER)) {
1295                 if (msk0 & PIC_LOWER)
1296                         idx0 = 1;
1297                 goto success;
1298         }
1299 
1300         /* Otherwise, there is a conflict.  */
1301         return -1;
1302 
1303 success:
1304         evts[0]->hw.idx = idx0;
1305         if (n_ev == 2)
1306                 evts[1]->hw.idx = idx0 ^ 1;
1307         return 0;
1308 }
1309 
1310 static int check_excludes(struct perf_event **evts, int n_prev, int n_new)
1311 {
1312         int eu = 0, ek = 0, eh = 0;
1313         struct perf_event *event;
1314         int i, n, first;
1315 
1316         if (!(sparc_pmu->flags & SPARC_PMU_ALL_EXCLUDES_SAME))
1317                 return 0;
1318 
1319         n = n_prev + n_new;
1320         if (n <= 1)
1321                 return 0;
1322 
1323         first = 1;
1324         for (i = 0; i < n; i++) {
1325                 event = evts[i];
1326                 if (first) {
1327                         eu = event->attr.exclude_user;
1328                         ek = event->attr.exclude_kernel;
1329                         eh = event->attr.exclude_hv;
1330                         first = 0;
1331                 } else if (event->attr.exclude_user != eu ||
1332                            event->attr.exclude_kernel != ek ||
1333                            event->attr.exclude_hv != eh) {
1334                         return -EAGAIN;
1335                 }
1336         }
1337 
1338         return 0;
1339 }
1340 
1341 static int collect_events(struct perf_event *group, int max_count,
1342                           struct perf_event *evts[], unsigned long *events,
1343                           int *current_idx)
1344 {
1345         struct perf_event *event;
1346         int n = 0;
1347 
1348         if (!is_software_event(group)) {
1349                 if (n >= max_count)
1350                         return -1;
1351                 evts[n] = group;
1352                 events[n] = group->hw.event_base;
1353                 current_idx[n++] = PIC_NO_INDEX;
1354         }
1355         for_each_sibling_event(event, group) {
1356                 if (!is_software_event(event) &&
1357                     event->state != PERF_EVENT_STATE_OFF) {
1358                         if (n >= max_count)
1359                                 return -1;
1360                         evts[n] = event;
1361                         events[n] = event->hw.event_base;
1362                         current_idx[n++] = PIC_NO_INDEX;
1363                 }
1364         }
1365         return n;
1366 }
1367 
1368 static int sparc_pmu_add(struct perf_event *event, int ef_flags)
1369 {
1370         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1371         int n0, ret = -EAGAIN;
1372         unsigned long flags;
1373 
1374         local_irq_save(flags);
1375 
1376         n0 = cpuc->n_events;
1377         if (n0 >= sparc_pmu->max_hw_events)
1378                 goto out;
1379 
1380         cpuc->event[n0] = event;
1381         cpuc->events[n0] = event->hw.event_base;
1382         cpuc->current_idx[n0] = PIC_NO_INDEX;
1383 
1384         event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
1385         if (!(ef_flags & PERF_EF_START))
1386                 event->hw.state |= PERF_HES_ARCH;
1387 
1388         /*
1389          * If group events scheduling transaction was started,
1390          * skip the schedulability test here, it will be performed
1391          * at commit time(->commit_txn) as a whole
1392          */
1393         if (cpuc->txn_flags & PERF_PMU_TXN_ADD)
1394                 goto nocheck;
1395 
1396         if (check_excludes(cpuc->event, n0, 1))
1397                 goto out;
1398         if (sparc_check_constraints(cpuc->event, cpuc->events, n0 + 1))
1399                 goto out;
1400 
1401 nocheck:
1402         cpuc->n_events++;
1403         cpuc->n_added++;
1404 
1405         ret = 0;
1406 out:
1407         local_irq_restore(flags);
1408         return ret;
1409 }
1410 
1411 static int sparc_pmu_event_init(struct perf_event *event)
1412 {
1413         struct perf_event_attr *attr = &event->attr;
1414         struct perf_event *evts[MAX_HWEVENTS];
1415         struct hw_perf_event *hwc = &event->hw;
1416         unsigned long events[MAX_HWEVENTS];
1417         int current_idx_dmy[MAX_HWEVENTS];
1418         const struct perf_event_map *pmap;
1419         int n;
1420 
1421         if (atomic_read(&nmi_active) < 0)
1422                 return -ENODEV;
1423 
1424         /* does not support taken branch sampling */
1425         if (has_branch_stack(event))
1426                 return -EOPNOTSUPP;
1427 
1428         switch (attr->type) {
1429         case PERF_TYPE_HARDWARE:
1430                 if (attr->config >= sparc_pmu->max_events)
1431                         return -EINVAL;
1432                 pmap = sparc_pmu->event_map(attr->config);
1433                 break;
1434 
1435         case PERF_TYPE_HW_CACHE:
1436                 pmap = sparc_map_cache_event(attr->config);
1437                 if (IS_ERR(pmap))
1438                         return PTR_ERR(pmap);
1439                 break;
1440 
1441         case PERF_TYPE_RAW:
1442                 pmap = NULL;
1443                 break;
1444 
1445         default:
1446                 return -ENOENT;
1447 
1448         }
1449 
1450         if (pmap) {
1451                 hwc->event_base = perf_event_encode(pmap);
1452         } else {
1453                 /*
1454                  * User gives us "(encoding << 16) | pic_mask" for
1455                  * PERF_TYPE_RAW events.
1456                  */
1457                 hwc->event_base = attr->config;
1458         }
1459 
1460         /* We save the enable bits in the config_base.  */
1461         hwc->config_base = sparc_pmu->irq_bit;
1462         if (!attr->exclude_user)
1463                 hwc->config_base |= sparc_pmu->user_bit;
1464         if (!attr->exclude_kernel)
1465                 hwc->config_base |= sparc_pmu->priv_bit;
1466         if (!attr->exclude_hv)
1467                 hwc->config_base |= sparc_pmu->hv_bit;
1468 
1469         n = 0;
1470         if (event->group_leader != event) {
1471                 n = collect_events(event->group_leader,
1472                                    sparc_pmu->max_hw_events - 1,
1473                                    evts, events, current_idx_dmy);
1474                 if (n < 0)
1475                         return -EINVAL;
1476         }
1477         events[n] = hwc->event_base;
1478         evts[n] = event;
1479 
1480         if (check_excludes(evts, n, 1))
1481                 return -EINVAL;
1482 
1483         if (sparc_check_constraints(evts, events, n + 1))
1484                 return -EINVAL;
1485 
1486         hwc->idx = PIC_NO_INDEX;
1487 
1488         /* Try to do all error checking before this point, as unwinding
1489          * state after grabbing the PMC is difficult.
1490          */
1491         perf_event_grab_pmc();
1492         event->destroy = hw_perf_event_destroy;
1493 
1494         if (!hwc->sample_period) {
1495                 hwc->sample_period = MAX_PERIOD;
1496                 hwc->last_period = hwc->sample_period;
1497                 local64_set(&hwc->period_left, hwc->sample_period);
1498         }
1499 
1500         return 0;
1501 }
1502 
1503 /*
1504  * Start group events scheduling transaction
1505  * Set the flag to make pmu::enable() not perform the
1506  * schedulability test, it will be performed at commit time
1507  */
1508 static void sparc_pmu_start_txn(struct pmu *pmu, unsigned int txn_flags)
1509 {
1510         struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
1511 
1512         WARN_ON_ONCE(cpuhw->txn_flags);         /* txn already in flight */
1513 
1514         cpuhw->txn_flags = txn_flags;
1515         if (txn_flags & ~PERF_PMU_TXN_ADD)
1516                 return;
1517 
1518         perf_pmu_disable(pmu);
1519 }
1520 
1521 /*
1522  * Stop group events scheduling transaction
1523  * Clear the flag and pmu::enable() will perform the
1524  * schedulability test.
1525  */
1526 static void sparc_pmu_cancel_txn(struct pmu *pmu)
1527 {
1528         struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
1529         unsigned int txn_flags;
1530 
1531         WARN_ON_ONCE(!cpuhw->txn_flags);        /* no txn in flight */
1532 
1533         txn_flags = cpuhw->txn_flags;
1534         cpuhw->txn_flags = 0;
1535         if (txn_flags & ~PERF_PMU_TXN_ADD)
1536                 return;
1537 
1538         perf_pmu_enable(pmu);
1539 }
1540 
1541 /*
1542  * Commit group events scheduling transaction
1543  * Perform the group schedulability test as a whole
1544  * Return 0 if success
1545  */
1546 static int sparc_pmu_commit_txn(struct pmu *pmu)
1547 {
1548         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1549         int n;
1550 
1551         if (!sparc_pmu)
1552                 return -EINVAL;
1553 
1554         WARN_ON_ONCE(!cpuc->txn_flags); /* no txn in flight */
1555 
1556         if (cpuc->txn_flags & ~PERF_PMU_TXN_ADD) {
1557                 cpuc->txn_flags = 0;
1558                 return 0;
1559         }
1560 
1561         n = cpuc->n_events;
1562         if (check_excludes(cpuc->event, 0, n))
1563                 return -EINVAL;
1564         if (sparc_check_constraints(cpuc->event, cpuc->events, n))
1565                 return -EAGAIN;
1566 
1567         cpuc->txn_flags = 0;
1568         perf_pmu_enable(pmu);
1569         return 0;
1570 }
1571 
1572 static struct pmu pmu = {
1573         .pmu_enable     = sparc_pmu_enable,
1574         .pmu_disable    = sparc_pmu_disable,
1575         .event_init     = sparc_pmu_event_init,
1576         .add            = sparc_pmu_add,
1577         .del            = sparc_pmu_del,
1578         .start          = sparc_pmu_start,
1579         .stop           = sparc_pmu_stop,
1580         .read           = sparc_pmu_read,
1581         .start_txn      = sparc_pmu_start_txn,
1582         .cancel_txn     = sparc_pmu_cancel_txn,
1583         .commit_txn     = sparc_pmu_commit_txn,
1584 };
1585 
1586 void perf_event_print_debug(void)
1587 {
1588         unsigned long flags;
1589         int cpu, i;
1590 
1591         if (!sparc_pmu)
1592                 return;
1593 
1594         local_irq_save(flags);
1595 
1596         cpu = smp_processor_id();
1597 
1598         pr_info("\n");
1599         for (i = 0; i < sparc_pmu->num_pcrs; i++)
1600                 pr_info("CPU#%d: PCR%d[%016llx]\n",
1601                         cpu, i, pcr_ops->read_pcr(i));
1602         for (i = 0; i < sparc_pmu->num_pic_regs; i++)
1603                 pr_info("CPU#%d: PIC%d[%016llx]\n",
1604                         cpu, i, pcr_ops->read_pic(i));
1605 
1606         local_irq_restore(flags);
1607 }
1608 
1609 static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
1610                                             unsigned long cmd, void *__args)
1611 {
1612         struct die_args *args = __args;
1613         struct perf_sample_data data;
1614         struct cpu_hw_events *cpuc;
1615         struct pt_regs *regs;
1616         u64 finish_clock;
1617         u64 start_clock;
1618         int i;
1619 
1620         if (!atomic_read(&active_events))
1621                 return NOTIFY_DONE;
1622 
1623         switch (cmd) {
1624         case DIE_NMI:
1625                 break;
1626 
1627         default:
1628                 return NOTIFY_DONE;
1629         }
1630 
1631         start_clock = sched_clock();
1632 
1633         regs = args->regs;
1634 
1635         cpuc = this_cpu_ptr(&cpu_hw_events);
1636 
1637         /* If the PMU has the TOE IRQ enable bits, we need to do a
1638          * dummy write to the %pcr to clear the overflow bits and thus
1639          * the interrupt.
1640          *
1641          * Do this before we peek at the counters to determine
1642          * overflow so we don't lose any events.
1643          */
1644         if (sparc_pmu->irq_bit &&
1645             sparc_pmu->num_pcrs == 1)
1646                 pcr_ops->write_pcr(0, cpuc->pcr[0]);
1647 
1648         for (i = 0; i < cpuc->n_events; i++) {
1649                 struct perf_event *event = cpuc->event[i];
1650                 int idx = cpuc->current_idx[i];
1651                 struct hw_perf_event *hwc;
1652                 u64 val;
1653 
1654                 if (sparc_pmu->irq_bit &&
1655                     sparc_pmu->num_pcrs > 1)
1656                         pcr_ops->write_pcr(idx, cpuc->pcr[idx]);
1657 
1658                 hwc = &event->hw;
1659                 val = sparc_perf_event_update(event, hwc, idx);
1660                 if (val & (1ULL << 31))
1661                         continue;
1662 
1663                 perf_sample_data_init(&data, 0, hwc->last_period);
1664                 if (!sparc_perf_event_set_period(event, hwc, idx))
1665                         continue;
1666 
1667                 if (perf_event_overflow(event, &data, regs))
1668                         sparc_pmu_stop(event, 0);
1669         }
1670 
1671         finish_clock = sched_clock();
1672 
1673         perf_sample_event_took(finish_clock - start_clock);
1674 
1675         return NOTIFY_STOP;
1676 }
1677 
1678 static __read_mostly struct notifier_block perf_event_nmi_notifier = {
1679         .notifier_call          = perf_event_nmi_handler,
1680 };
1681 
1682 static bool __init supported_pmu(void)
1683 {
1684         if (!strcmp(sparc_pmu_type, "ultra3") ||
1685             !strcmp(sparc_pmu_type, "ultra3+") ||
1686             !strcmp(sparc_pmu_type, "ultra3i") ||
1687             !strcmp(sparc_pmu_type, "ultra4+")) {
1688                 sparc_pmu = &ultra3_pmu;
1689                 return true;
1690         }
1691         if (!strcmp(sparc_pmu_type, "niagara")) {
1692                 sparc_pmu = &niagara1_pmu;
1693                 return true;
1694         }
1695         if (!strcmp(sparc_pmu_type, "niagara2") ||
1696             !strcmp(sparc_pmu_type, "niagara3")) {
1697                 sparc_pmu = &niagara2_pmu;
1698                 return true;
1699         }
1700         if (!strcmp(sparc_pmu_type, "niagara4") ||
1701             !strcmp(sparc_pmu_type, "niagara5")) {
1702                 sparc_pmu = &niagara4_pmu;
1703                 return true;
1704         }
1705         if (!strcmp(sparc_pmu_type, "sparc-m7")) {
1706                 sparc_pmu = &sparc_m7_pmu;
1707                 return true;
1708         }
1709         return false;
1710 }
1711 
1712 static int __init init_hw_perf_events(void)
1713 {
1714         int err;
1715 
1716         pr_info("Performance events: ");
1717 
1718         err = pcr_arch_init();
1719         if (err || !supported_pmu()) {
1720                 pr_cont("No support for PMU type '%s'\n", sparc_pmu_type);
1721                 return 0;
1722         }
1723 
1724         pr_cont("Supported PMU type is '%s'\n", sparc_pmu_type);
1725 
1726         perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW);
1727         register_die_notifier(&perf_event_nmi_notifier);
1728 
1729         return 0;
1730 }
1731 pure_initcall(init_hw_perf_events);
1732 
1733 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
1734                            struct pt_regs *regs)
1735 {
1736         unsigned long ksp, fp;
1737 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1738         int graph = 0;
1739 #endif
1740 
1741         stack_trace_flush();
1742 
1743         perf_callchain_store(entry, regs->tpc);
1744 
1745         ksp = regs->u_regs[UREG_I6];
1746         fp = ksp + STACK_BIAS;
1747         do {
1748                 struct sparc_stackf *sf;
1749                 struct pt_regs *regs;
1750                 unsigned long pc;
1751 
1752                 if (!kstack_valid(current_thread_info(), fp))
1753                         break;
1754 
1755                 sf = (struct sparc_stackf *) fp;
1756                 regs = (struct pt_regs *) (sf + 1);
1757 
1758                 if (kstack_is_trap_frame(current_thread_info(), regs)) {
1759                         if (user_mode(regs))
1760                                 break;
1761                         pc = regs->tpc;
1762                         fp = regs->u_regs[UREG_I6] + STACK_BIAS;
1763                 } else {
1764                         pc = sf->callers_pc;
1765                         fp = (unsigned long)sf->fp + STACK_BIAS;
1766                 }
1767                 perf_callchain_store(entry, pc);
1768 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1769                 if ((pc + 8UL) == (unsigned long) &return_to_handler) {
1770                         int index = current->curr_ret_stack;
1771                         if (current->ret_stack && index >= graph) {
1772                                 pc = current->ret_stack[index - graph].ret;
1773                                 perf_callchain_store(entry, pc);
1774                                 graph++;
1775                         }
1776                 }
1777 #endif
1778         } while (entry->nr < entry->max_stack);
1779 }
1780 
1781 static inline int
1782 valid_user_frame(const void __user *fp, unsigned long size)
1783 {
1784         /* addresses should be at least 4-byte aligned */
1785         if (((unsigned long) fp) & 3)
1786                 return 0;
1787 
1788         return (__range_not_ok(fp, size, TASK_SIZE) == 0);
1789 }
1790 
1791 static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
1792                                    struct pt_regs *regs)
1793 {
1794         unsigned long ufp;
1795 
1796         ufp = regs->u_regs[UREG_FP] + STACK_BIAS;
1797         do {
1798                 struct sparc_stackf __user *usf;
1799                 struct sparc_stackf sf;
1800                 unsigned long pc;
1801 
1802                 usf = (struct sparc_stackf __user *)ufp;
1803                 if (!valid_user_frame(usf, sizeof(sf)))
1804                         break;
1805 
1806                 if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1807                         break;
1808 
1809                 pc = sf.callers_pc;
1810                 ufp = (unsigned long)sf.fp + STACK_BIAS;
1811                 perf_callchain_store(entry, pc);
1812         } while (entry->nr < entry->max_stack);
1813 }
1814 
1815 static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
1816                                    struct pt_regs *regs)
1817 {
1818         unsigned long ufp;
1819 
1820         ufp = regs->u_regs[UREG_FP] & 0xffffffffUL;
1821         do {
1822                 unsigned long pc;
1823 
1824                 if (thread32_stack_is_64bit(ufp)) {
1825                         struct sparc_stackf __user *usf;
1826                         struct sparc_stackf sf;
1827 
1828                         ufp += STACK_BIAS;
1829                         usf = (struct sparc_stackf __user *)ufp;
1830                         if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1831                                 break;
1832                         pc = sf.callers_pc & 0xffffffff;
1833                         ufp = ((unsigned long) sf.fp) & 0xffffffff;
1834                 } else {
1835                         struct sparc_stackf32 __user *usf;
1836                         struct sparc_stackf32 sf;
1837                         usf = (struct sparc_stackf32 __user *)ufp;
1838                         if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1839                                 break;
1840                         pc = sf.callers_pc;
1841                         ufp = (unsigned long)sf.fp;
1842                 }
1843                 perf_callchain_store(entry, pc);
1844         } while (entry->nr < entry->max_stack);
1845 }
1846 
1847 void
1848 perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
1849 {
1850         u64 saved_fault_address = current_thread_info()->fault_address;
1851         u8 saved_fault_code = get_thread_fault_code();
1852 
1853         perf_callchain_store(entry, regs->tpc);
1854 
1855         if (!current->mm)
1856                 return;
1857 
1858         flushw_user();
1859 
1860         pagefault_disable();
1861 
1862         if (test_thread_flag(TIF_32BIT))
1863                 perf_callchain_user_32(entry, regs);
1864         else
1865                 perf_callchain_user_64(entry, regs);
1866 
1867         pagefault_enable();
1868 
1869         set_thread_fault_code(saved_fault_code);
1870         current_thread_info()->fault_address = saved_fault_address;
1871 }
1872 

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