arch/sparc/kernel/perf

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This source file includes following definitions.
perf_event_encode
perf_event_get_msk
perf_event_get_enc
sparc_default_read_pmc
sparc_default_write_pmc
ultra3_event_map
niagara1_event_map
niagara2_event_map
niagara4_event_map
sparc_vt_read_pmc
sparc_vt_write_pmc
event_encoding
mask_for_index
nop_for_index
sparc_pmu_enable_event
sparc_pmu_disable_event
sparc_perf_event_update
sparc_perf_event_set_period
read_in_all_counters
calculate_single_pcr
calculate_multiple_pcrs
update_pcrs_for_enable
sparc_pmu_enable
sparc_pmu_disable
active_event_index
sparc_pmu_start
sparc_pmu_stop
sparc_pmu_del
sparc_pmu_read
perf_stop_nmi_watchdog
perf_event_grab_pmc
perf_event_release_pmc
sparc_map_cache_event
hw_perf_event_destroy
sparc_check_constraints
check_excludes
collect_events
sparc_pmu_add
sparc_pmu_event_init
sparc_pmu_start_txn
sparc_pmu_cancel_txn
sparc_pmu_commit_txn
perf_event_print_debug
perf_event_nmi_handler
supported_pmu
init_hw_perf_events
perf_callchain_kernel
valid_user_frame
perf_callchain_user_64
perf_callchain_user_32
perf_callchain_user
   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         /* The period may have been changed by PERF_EVENT_IOC_PERIOD */
 895         if (unlikely(period != hwc->last_period))
 896                 left = period - (hwc->last_period - left);
 897 
 898         if (unlikely(left <= -period)) {
 899                 left = period;
 900                 local64_set(&hwc->period_left, left);
 901                 hwc->last_period = period;
 902                 ret = 1;
 903         }
 904 
 905         if (unlikely(left <= 0)) {
 906                 left += period;
 907                 local64_set(&hwc->period_left, left);
 908                 hwc->last_period = period;
 909                 ret = 1;
 910         }
 911         if (left > MAX_PERIOD)
 912                 left = MAX_PERIOD;
 913 
 914         local64_set(&hwc->prev_count, (u64)-left);
 915 
 916         sparc_pmu->write_pmc(idx, (u64)(-left) & 0xffffffff);
 917 
 918         perf_event_update_userpage(event);
 919 
 920         return ret;
 921 }
 922 
 923 static void read_in_all_counters(struct cpu_hw_events *cpuc)
 924 {
 925         int i;
 926 
 927         for (i = 0; i < cpuc->n_events; i++) {
 928                 struct perf_event *cp = cpuc->event[i];
 929 
 930                 if (cpuc->current_idx[i] != PIC_NO_INDEX &&
 931                     cpuc->current_idx[i] != cp->hw.idx) {
 932                         sparc_perf_event_update(cp, &cp->hw,
 933                                                 cpuc->current_idx[i]);
 934                         cpuc->current_idx[i] = PIC_NO_INDEX;
 935                         if (cp->hw.state & PERF_HES_STOPPED)
 936                                 cp->hw.state |= PERF_HES_ARCH;
 937                 }
 938         }
 939 }
 940 
 941 /* On this PMU all PICs are programmed using a single PCR.  Calculate
 942  * the combined control register value.
 943  *
 944  * For such chips we require that all of the events have the same
 945  * configuration, so just fetch the settings from the first entry.
 946  */
 947 static void calculate_single_pcr(struct cpu_hw_events *cpuc)
 948 {
 949         int i;
 950 
 951         if (!cpuc->n_added)
 952                 goto out;
 953 
 954         /* Assign to counters all unassigned events.  */
 955         for (i = 0; i < cpuc->n_events; i++) {
 956                 struct perf_event *cp = cpuc->event[i];
 957                 struct hw_perf_event *hwc = &cp->hw;
 958                 int idx = hwc->idx;
 959                 u64 enc;
 960 
 961                 if (cpuc->current_idx[i] != PIC_NO_INDEX)
 962                         continue;
 963 
 964                 sparc_perf_event_set_period(cp, hwc, idx);
 965                 cpuc->current_idx[i] = idx;
 966 
 967                 enc = perf_event_get_enc(cpuc->events[i]);
 968                 cpuc->pcr[0] &= ~mask_for_index(idx);
 969                 if (hwc->state & PERF_HES_ARCH) {
 970                         cpuc->pcr[0] |= nop_for_index(idx);
 971                 } else {
 972                         cpuc->pcr[0] |= event_encoding(enc, idx);
 973                         hwc->state = 0;
 974                 }
 975         }
 976 out:
 977         cpuc->pcr[0] |= cpuc->event[0]->hw.config_base;
 978 }
 979 
 980 static void sparc_pmu_start(struct perf_event *event, int flags);
 981 
 982 /* On this PMU each PIC has it's own PCR control register.  */
 983 static void calculate_multiple_pcrs(struct cpu_hw_events *cpuc)
 984 {
 985         int i;
 986 
 987         if (!cpuc->n_added)
 988                 goto out;
 989 
 990         for (i = 0; i < cpuc->n_events; i++) {
 991                 struct perf_event *cp = cpuc->event[i];
 992                 struct hw_perf_event *hwc = &cp->hw;
 993                 int idx = hwc->idx;
 994 
 995                 if (cpuc->current_idx[i] != PIC_NO_INDEX)
 996                         continue;
 997 
 998                 cpuc->current_idx[i] = idx;
 999 
1000                 if (cp->hw.state & PERF_HES_ARCH)
1001                         continue;
1002 
1003                 sparc_pmu_start(cp, PERF_EF_RELOAD);
1004         }
1005 out:
1006         for (i = 0; i < cpuc->n_events; i++) {
1007                 struct perf_event *cp = cpuc->event[i];
1008                 int idx = cp->hw.idx;
1009 
1010                 cpuc->pcr[idx] |= cp->hw.config_base;
1011         }
1012 }
1013 
1014 /* If performance event entries have been added, move existing events
1015  * around (if necessary) and then assign new entries to counters.
1016  */
1017 static void update_pcrs_for_enable(struct cpu_hw_events *cpuc)
1018 {
1019         if (cpuc->n_added)
1020                 read_in_all_counters(cpuc);
1021 
1022         if (sparc_pmu->num_pcrs == 1) {
1023                 calculate_single_pcr(cpuc);
1024         } else {
1025                 calculate_multiple_pcrs(cpuc);
1026         }
1027 }
1028 
1029 static void sparc_pmu_enable(struct pmu *pmu)
1030 {
1031         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1032         int i;
1033 
1034         if (cpuc->enabled)
1035                 return;
1036 
1037         cpuc->enabled = 1;
1038         barrier();
1039 
1040         if (cpuc->n_events)
1041                 update_pcrs_for_enable(cpuc);
1042 
1043         for (i = 0; i < sparc_pmu->num_pcrs; i++)
1044                 pcr_ops->write_pcr(i, cpuc->pcr[i]);
1045 }
1046 
1047 static void sparc_pmu_disable(struct pmu *pmu)
1048 {
1049         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1050         int i;
1051 
1052         if (!cpuc->enabled)
1053                 return;
1054 
1055         cpuc->enabled = 0;
1056         cpuc->n_added = 0;
1057 
1058         for (i = 0; i < sparc_pmu->num_pcrs; i++) {
1059                 u64 val = cpuc->pcr[i];
1060 
1061                 val &= ~(sparc_pmu->user_bit | sparc_pmu->priv_bit |
1062                          sparc_pmu->hv_bit | sparc_pmu->irq_bit);
1063                 cpuc->pcr[i] = val;
1064                 pcr_ops->write_pcr(i, cpuc->pcr[i]);
1065         }
1066 }
1067 
1068 static int active_event_index(struct cpu_hw_events *cpuc,
1069                               struct perf_event *event)
1070 {
1071         int i;
1072 
1073         for (i = 0; i < cpuc->n_events; i++) {
1074                 if (cpuc->event[i] == event)
1075                         break;
1076         }
1077         BUG_ON(i == cpuc->n_events);
1078         return cpuc->current_idx[i];
1079 }
1080 
1081 static void sparc_pmu_start(struct perf_event *event, int flags)
1082 {
1083         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1084         int idx = active_event_index(cpuc, event);
1085 
1086         if (flags & PERF_EF_RELOAD) {
1087                 WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE));
1088                 sparc_perf_event_set_period(event, &event->hw, idx);
1089         }
1090 
1091         event->hw.state = 0;
1092 
1093         sparc_pmu_enable_event(cpuc, &event->hw, idx);
1094 
1095         perf_event_update_userpage(event);
1096 }
1097 
1098 static void sparc_pmu_stop(struct perf_event *event, int flags)
1099 {
1100         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1101         int idx = active_event_index(cpuc, event);
1102 
1103         if (!(event->hw.state & PERF_HES_STOPPED)) {
1104                 sparc_pmu_disable_event(cpuc, &event->hw, idx);
1105                 event->hw.state |= PERF_HES_STOPPED;
1106         }
1107 
1108         if (!(event->hw.state & PERF_HES_UPTODATE) && (flags & PERF_EF_UPDATE)) {
1109                 sparc_perf_event_update(event, &event->hw, idx);
1110                 event->hw.state |= PERF_HES_UPTODATE;
1111         }
1112 }
1113 
1114 static void sparc_pmu_del(struct perf_event *event, int _flags)
1115 {
1116         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1117         unsigned long flags;
1118         int i;
1119 
1120         local_irq_save(flags);
1121 
1122         for (i = 0; i < cpuc->n_events; i++) {
1123                 if (event == cpuc->event[i]) {
1124                         /* Absorb the final count and turn off the
1125                          * event.
1126                          */
1127                         sparc_pmu_stop(event, PERF_EF_UPDATE);
1128 
1129                         /* Shift remaining entries down into
1130                          * the existing slot.
1131                          */
1132                         while (++i < cpuc->n_events) {
1133                                 cpuc->event[i - 1] = cpuc->event[i];
1134                                 cpuc->events[i - 1] = cpuc->events[i];
1135                                 cpuc->current_idx[i - 1] =
1136                                         cpuc->current_idx[i];
1137                         }
1138 
1139                         perf_event_update_userpage(event);
1140 
1141                         cpuc->n_events--;
1142                         break;
1143                 }
1144         }
1145 
1146         local_irq_restore(flags);
1147 }
1148 
1149 static void sparc_pmu_read(struct perf_event *event)
1150 {
1151         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1152         int idx = active_event_index(cpuc, event);
1153         struct hw_perf_event *hwc = &event->hw;
1154 
1155         sparc_perf_event_update(event, hwc, idx);
1156 }
1157 
1158 static atomic_t active_events = ATOMIC_INIT(0);
1159 static DEFINE_MUTEX(pmc_grab_mutex);
1160 
1161 static void perf_stop_nmi_watchdog(void *unused)
1162 {
1163         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1164         int i;
1165 
1166         stop_nmi_watchdog(NULL);
1167         for (i = 0; i < sparc_pmu->num_pcrs; i++)
1168                 cpuc->pcr[i] = pcr_ops->read_pcr(i);
1169 }
1170 
1171 static void perf_event_grab_pmc(void)
1172 {
1173         if (atomic_inc_not_zero(&active_events))
1174                 return;
1175 
1176         mutex_lock(&pmc_grab_mutex);
1177         if (atomic_read(&active_events) == 0) {
1178                 if (atomic_read(&nmi_active) > 0) {
1179                         on_each_cpu(perf_stop_nmi_watchdog, NULL, 1);
1180                         BUG_ON(atomic_read(&nmi_active) != 0);
1181                 }
1182                 atomic_inc(&active_events);
1183         }
1184         mutex_unlock(&pmc_grab_mutex);
1185 }
1186 
1187 static void perf_event_release_pmc(void)
1188 {
1189         if (atomic_dec_and_mutex_lock(&active_events, &pmc_grab_mutex)) {
1190                 if (atomic_read(&nmi_active) == 0)
1191                         on_each_cpu(start_nmi_watchdog, NULL, 1);
1192                 mutex_unlock(&pmc_grab_mutex);
1193         }
1194 }
1195 
1196 static const struct perf_event_map *sparc_map_cache_event(u64 config)
1197 {
1198         unsigned int cache_type, cache_op, cache_result;
1199         const struct perf_event_map *pmap;
1200 
1201         if (!sparc_pmu->cache_map)
1202                 return ERR_PTR(-ENOENT);
1203 
1204         cache_type = (config >>  0) & 0xff;
1205         if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
1206                 return ERR_PTR(-EINVAL);
1207 
1208         cache_op = (config >>  8) & 0xff;
1209         if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
1210                 return ERR_PTR(-EINVAL);
1211 
1212         cache_result = (config >> 16) & 0xff;
1213         if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
1214                 return ERR_PTR(-EINVAL);
1215 
1216         pmap = &((*sparc_pmu->cache_map)[cache_type][cache_op][cache_result]);
1217 
1218         if (pmap->encoding == CACHE_OP_UNSUPPORTED)
1219                 return ERR_PTR(-ENOENT);
1220 
1221         if (pmap->encoding == CACHE_OP_NONSENSE)
1222                 return ERR_PTR(-EINVAL);
1223 
1224         return pmap;
1225 }
1226 
1227 static void hw_perf_event_destroy(struct perf_event *event)
1228 {
1229         perf_event_release_pmc();
1230 }
1231 
1232 /* Make sure all events can be scheduled into the hardware at
1233  * the same time.  This is simplified by the fact that we only
1234  * need to support 2 simultaneous HW events.
1235  *
1236  * As a side effect, the evts[]->hw.idx values will be assigned
1237  * on success.  These are pending indexes.  When the events are
1238  * actually programmed into the chip, these values will propagate
1239  * to the per-cpu cpuc->current_idx[] slots, see the code in
1240  * maybe_change_configuration() for details.
1241  */
1242 static int sparc_check_constraints(struct perf_event **evts,
1243                                    unsigned long *events, int n_ev)
1244 {
1245         u8 msk0 = 0, msk1 = 0;
1246         int idx0 = 0;
1247 
1248         /* This case is possible when we are invoked from
1249          * hw_perf_group_sched_in().
1250          */
1251         if (!n_ev)
1252                 return 0;
1253 
1254         if (n_ev > sparc_pmu->max_hw_events)
1255                 return -1;
1256 
1257         if (!(sparc_pmu->flags & SPARC_PMU_HAS_CONFLICTS)) {
1258                 int i;
1259 
1260                 for (i = 0; i < n_ev; i++)
1261                         evts[i]->hw.idx = i;
1262                 return 0;
1263         }
1264 
1265         msk0 = perf_event_get_msk(events[0]);
1266         if (n_ev == 1) {
1267                 if (msk0 & PIC_LOWER)
1268                         idx0 = 1;
1269                 goto success;
1270         }
1271         BUG_ON(n_ev != 2);
1272         msk1 = perf_event_get_msk(events[1]);
1273 
1274         /* If both events can go on any counter, OK.  */
1275         if (msk0 == (PIC_UPPER | PIC_LOWER) &&
1276             msk1 == (PIC_UPPER | PIC_LOWER))
1277                 goto success;
1278 
1279         /* If one event is limited to a specific counter,
1280          * and the other can go on both, OK.
1281          */
1282         if ((msk0 == PIC_UPPER || msk0 == PIC_LOWER) &&
1283             msk1 == (PIC_UPPER | PIC_LOWER)) {
1284                 if (msk0 & PIC_LOWER)
1285                         idx0 = 1;
1286                 goto success;
1287         }
1288 
1289         if ((msk1 == PIC_UPPER || msk1 == PIC_LOWER) &&
1290             msk0 == (PIC_UPPER | PIC_LOWER)) {
1291                 if (msk1 & PIC_UPPER)
1292                         idx0 = 1;
1293                 goto success;
1294         }
1295 
1296         /* If the events are fixed to different counters, OK.  */
1297         if ((msk0 == PIC_UPPER && msk1 == PIC_LOWER) ||
1298             (msk0 == PIC_LOWER && msk1 == PIC_UPPER)) {
1299                 if (msk0 & PIC_LOWER)
1300                         idx0 = 1;
1301                 goto success;
1302         }
1303 
1304         /* Otherwise, there is a conflict.  */
1305         return -1;
1306 
1307 success:
1308         evts[0]->hw.idx = idx0;
1309         if (n_ev == 2)
1310                 evts[1]->hw.idx = idx0 ^ 1;
1311         return 0;
1312 }
1313 
1314 static int check_excludes(struct perf_event **evts, int n_prev, int n_new)
1315 {
1316         int eu = 0, ek = 0, eh = 0;
1317         struct perf_event *event;
1318         int i, n, first;
1319 
1320         if (!(sparc_pmu->flags & SPARC_PMU_ALL_EXCLUDES_SAME))
1321                 return 0;
1322 
1323         n = n_prev + n_new;
1324         if (n <= 1)
1325                 return 0;
1326 
1327         first = 1;
1328         for (i = 0; i < n; i++) {
1329                 event = evts[i];
1330                 if (first) {
1331                         eu = event->attr.exclude_user;
1332                         ek = event->attr.exclude_kernel;
1333                         eh = event->attr.exclude_hv;
1334                         first = 0;
1335                 } else if (event->attr.exclude_user != eu ||
1336                            event->attr.exclude_kernel != ek ||
1337                            event->attr.exclude_hv != eh) {
1338                         return -EAGAIN;
1339                 }
1340         }
1341 
1342         return 0;
1343 }
1344 
1345 static int collect_events(struct perf_event *group, int max_count,
1346                           struct perf_event *evts[], unsigned long *events,
1347                           int *current_idx)
1348 {
1349         struct perf_event *event;
1350         int n = 0;
1351 
1352         if (!is_software_event(group)) {
1353                 if (n >= max_count)
1354                         return -1;
1355                 evts[n] = group;
1356                 events[n] = group->hw.event_base;
1357                 current_idx[n++] = PIC_NO_INDEX;
1358         }
1359         for_each_sibling_event(event, group) {
1360                 if (!is_software_event(event) &&
1361                     event->state != PERF_EVENT_STATE_OFF) {
1362                         if (n >= max_count)
1363                                 return -1;
1364                         evts[n] = event;
1365                         events[n] = event->hw.event_base;
1366                         current_idx[n++] = PIC_NO_INDEX;
1367                 }
1368         }
1369         return n;
1370 }
1371 
1372 static int sparc_pmu_add(struct perf_event *event, int ef_flags)
1373 {
1374         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1375         int n0, ret = -EAGAIN;
1376         unsigned long flags;
1377 
1378         local_irq_save(flags);
1379 
1380         n0 = cpuc->n_events;
1381         if (n0 >= sparc_pmu->max_hw_events)
1382                 goto out;
1383 
1384         cpuc->event[n0] = event;
1385         cpuc->events[n0] = event->hw.event_base;
1386         cpuc->current_idx[n0] = PIC_NO_INDEX;
1387 
1388         event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
1389         if (!(ef_flags & PERF_EF_START))
1390                 event->hw.state |= PERF_HES_ARCH;
1391 
1392         /*
1393          * If group events scheduling transaction was started,
1394          * skip the schedulability test here, it will be performed
1395          * at commit time(->commit_txn) as a whole
1396          */
1397         if (cpuc->txn_flags & PERF_PMU_TXN_ADD)
1398                 goto nocheck;
1399 
1400         if (check_excludes(cpuc->event, n0, 1))
1401                 goto out;
1402         if (sparc_check_constraints(cpuc->event, cpuc->events, n0 + 1))
1403                 goto out;
1404 
1405 nocheck:
1406         cpuc->n_events++;
1407         cpuc->n_added++;
1408 
1409         ret = 0;
1410 out:
1411         local_irq_restore(flags);
1412         return ret;
1413 }
1414 
1415 static int sparc_pmu_event_init(struct perf_event *event)
1416 {
1417         struct perf_event_attr *attr = &event->attr;
1418         struct perf_event *evts[MAX_HWEVENTS];
1419         struct hw_perf_event *hwc = &event->hw;
1420         unsigned long events[MAX_HWEVENTS];
1421         int current_idx_dmy[MAX_HWEVENTS];
1422         const struct perf_event_map *pmap;
1423         int n;
1424 
1425         if (atomic_read(&nmi_active) < 0)
1426                 return -ENODEV;
1427 
1428         /* does not support taken branch sampling */
1429         if (has_branch_stack(event))
1430                 return -EOPNOTSUPP;
1431 
1432         switch (attr->type) {
1433         case PERF_TYPE_HARDWARE:
1434                 if (attr->config >= sparc_pmu->max_events)
1435                         return -EINVAL;
1436                 pmap = sparc_pmu->event_map(attr->config);
1437                 break;
1438 
1439         case PERF_TYPE_HW_CACHE:
1440                 pmap = sparc_map_cache_event(attr->config);
1441                 if (IS_ERR(pmap))
1442                         return PTR_ERR(pmap);
1443                 break;
1444 
1445         case PERF_TYPE_RAW:
1446                 pmap = NULL;
1447                 break;
1448 
1449         default:
1450                 return -ENOENT;
1451 
1452         }
1453 
1454         if (pmap) {
1455                 hwc->event_base = perf_event_encode(pmap);
1456         } else {
1457                 /*
1458                  * User gives us "(encoding << 16) | pic_mask" for
1459                  * PERF_TYPE_RAW events.
1460                  */
1461                 hwc->event_base = attr->config;
1462         }
1463 
1464         /* We save the enable bits in the config_base.  */
1465         hwc->config_base = sparc_pmu->irq_bit;
1466         if (!attr->exclude_user)
1467                 hwc->config_base |= sparc_pmu->user_bit;
1468         if (!attr->exclude_kernel)
1469                 hwc->config_base |= sparc_pmu->priv_bit;
1470         if (!attr->exclude_hv)
1471                 hwc->config_base |= sparc_pmu->hv_bit;
1472 
1473         n = 0;
1474         if (event->group_leader != event) {
1475                 n = collect_events(event->group_leader,
1476                                    sparc_pmu->max_hw_events - 1,
1477                                    evts, events, current_idx_dmy);
1478                 if (n < 0)
1479                         return -EINVAL;
1480         }
1481         events[n] = hwc->event_base;
1482         evts[n] = event;
1483 
1484         if (check_excludes(evts, n, 1))
1485                 return -EINVAL;
1486 
1487         if (sparc_check_constraints(evts, events, n + 1))
1488                 return -EINVAL;
1489 
1490         hwc->idx = PIC_NO_INDEX;
1491 
1492         /* Try to do all error checking before this point, as unwinding
1493          * state after grabbing the PMC is difficult.
1494          */
1495         perf_event_grab_pmc();
1496         event->destroy = hw_perf_event_destroy;
1497 
1498         if (!hwc->sample_period) {
1499                 hwc->sample_period = MAX_PERIOD;
1500                 hwc->last_period = hwc->sample_period;
1501                 local64_set(&hwc->period_left, hwc->sample_period);
1502         }
1503 
1504         return 0;
1505 }
1506 
1507 /*
1508  * Start group events scheduling transaction
1509  * Set the flag to make pmu::enable() not perform the
1510  * schedulability test, it will be performed at commit time
1511  */
1512 static void sparc_pmu_start_txn(struct pmu *pmu, unsigned int txn_flags)
1513 {
1514         struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
1515 
1516         WARN_ON_ONCE(cpuhw->txn_flags);         /* txn already in flight */
1517 
1518         cpuhw->txn_flags = txn_flags;
1519         if (txn_flags & ~PERF_PMU_TXN_ADD)
1520                 return;
1521 
1522         perf_pmu_disable(pmu);
1523 }
1524 
1525 /*
1526  * Stop group events scheduling transaction
1527  * Clear the flag and pmu::enable() will perform the
1528  * schedulability test.
1529  */
1530 static void sparc_pmu_cancel_txn(struct pmu *pmu)
1531 {
1532         struct cpu_hw_events *cpuhw = this_cpu_ptr(&cpu_hw_events);
1533         unsigned int txn_flags;
1534 
1535         WARN_ON_ONCE(!cpuhw->txn_flags);        /* no txn in flight */
1536 
1537         txn_flags = cpuhw->txn_flags;
1538         cpuhw->txn_flags = 0;
1539         if (txn_flags & ~PERF_PMU_TXN_ADD)
1540                 return;
1541 
1542         perf_pmu_enable(pmu);
1543 }
1544 
1545 /*
1546  * Commit group events scheduling transaction
1547  * Perform the group schedulability test as a whole
1548  * Return 0 if success
1549  */
1550 static int sparc_pmu_commit_txn(struct pmu *pmu)
1551 {
1552         struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
1553         int n;
1554 
1555         if (!sparc_pmu)
1556                 return -EINVAL;
1557 
1558         WARN_ON_ONCE(!cpuc->txn_flags); /* no txn in flight */
1559 
1560         if (cpuc->txn_flags & ~PERF_PMU_TXN_ADD) {
1561                 cpuc->txn_flags = 0;
1562                 return 0;
1563         }
1564 
1565         n = cpuc->n_events;
1566         if (check_excludes(cpuc->event, 0, n))
1567                 return -EINVAL;
1568         if (sparc_check_constraints(cpuc->event, cpuc->events, n))
1569                 return -EAGAIN;
1570 
1571         cpuc->txn_flags = 0;
1572         perf_pmu_enable(pmu);
1573         return 0;
1574 }
1575 
1576 static struct pmu pmu = {
1577         .pmu_enable     = sparc_pmu_enable,
1578         .pmu_disable    = sparc_pmu_disable,
1579         .event_init     = sparc_pmu_event_init,
1580         .add            = sparc_pmu_add,
1581         .del            = sparc_pmu_del,
1582         .start          = sparc_pmu_start,
1583         .stop           = sparc_pmu_stop,
1584         .read           = sparc_pmu_read,
1585         .start_txn      = sparc_pmu_start_txn,
1586         .cancel_txn     = sparc_pmu_cancel_txn,
1587         .commit_txn     = sparc_pmu_commit_txn,
1588 };
1589 
1590 void perf_event_print_debug(void)
1591 {
1592         unsigned long flags;
1593         int cpu, i;
1594 
1595         if (!sparc_pmu)
1596                 return;
1597 
1598         local_irq_save(flags);
1599 
1600         cpu = smp_processor_id();
1601 
1602         pr_info("\n");
1603         for (i = 0; i < sparc_pmu->num_pcrs; i++)
1604                 pr_info("CPU#%d: PCR%d[%016llx]\n",
1605                         cpu, i, pcr_ops->read_pcr(i));
1606         for (i = 0; i < sparc_pmu->num_pic_regs; i++)
1607                 pr_info("CPU#%d: PIC%d[%016llx]\n",
1608                         cpu, i, pcr_ops->read_pic(i));
1609 
1610         local_irq_restore(flags);
1611 }
1612 
1613 static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
1614                                             unsigned long cmd, void *__args)
1615 {
1616         struct die_args *args = __args;
1617         struct perf_sample_data data;
1618         struct cpu_hw_events *cpuc;
1619         struct pt_regs *regs;
1620         u64 finish_clock;
1621         u64 start_clock;
1622         int i;
1623 
1624         if (!atomic_read(&active_events))
1625                 return NOTIFY_DONE;
1626 
1627         switch (cmd) {
1628         case DIE_NMI:
1629                 break;
1630 
1631         default:
1632                 return NOTIFY_DONE;
1633         }
1634 
1635         start_clock = sched_clock();
1636 
1637         regs = args->regs;
1638 
1639         cpuc = this_cpu_ptr(&cpu_hw_events);
1640 
1641         /* If the PMU has the TOE IRQ enable bits, we need to do a
1642          * dummy write to the %pcr to clear the overflow bits and thus
1643          * the interrupt.
1644          *
1645          * Do this before we peek at the counters to determine
1646          * overflow so we don't lose any events.
1647          */
1648         if (sparc_pmu->irq_bit &&
1649             sparc_pmu->num_pcrs == 1)
1650                 pcr_ops->write_pcr(0, cpuc->pcr[0]);
1651 
1652         for (i = 0; i < cpuc->n_events; i++) {
1653                 struct perf_event *event = cpuc->event[i];
1654                 int idx = cpuc->current_idx[i];
1655                 struct hw_perf_event *hwc;
1656                 u64 val;
1657 
1658                 if (sparc_pmu->irq_bit &&
1659                     sparc_pmu->num_pcrs > 1)
1660                         pcr_ops->write_pcr(idx, cpuc->pcr[idx]);
1661 
1662                 hwc = &event->hw;
1663                 val = sparc_perf_event_update(event, hwc, idx);
1664                 if (val & (1ULL << 31))
1665                         continue;
1666 
1667                 perf_sample_data_init(&data, 0, hwc->last_period);
1668                 if (!sparc_perf_event_set_period(event, hwc, idx))
1669                         continue;
1670 
1671                 if (perf_event_overflow(event, &data, regs))
1672                         sparc_pmu_stop(event, 0);
1673         }
1674 
1675         finish_clock = sched_clock();
1676 
1677         perf_sample_event_took(finish_clock - start_clock);
1678 
1679         return NOTIFY_STOP;
1680 }
1681 
1682 static __read_mostly struct notifier_block perf_event_nmi_notifier = {
1683         .notifier_call          = perf_event_nmi_handler,
1684 };
1685 
1686 static bool __init supported_pmu(void)
1687 {
1688         if (!strcmp(sparc_pmu_type, "ultra3") ||
1689             !strcmp(sparc_pmu_type, "ultra3+") ||
1690             !strcmp(sparc_pmu_type, "ultra3i") ||
1691             !strcmp(sparc_pmu_type, "ultra4+")) {
1692                 sparc_pmu = &ultra3_pmu;
1693                 return true;
1694         }
1695         if (!strcmp(sparc_pmu_type, "niagara")) {
1696                 sparc_pmu = &niagara1_pmu;
1697                 return true;
1698         }
1699         if (!strcmp(sparc_pmu_type, "niagara2") ||
1700             !strcmp(sparc_pmu_type, "niagara3")) {
1701                 sparc_pmu = &niagara2_pmu;
1702                 return true;
1703         }
1704         if (!strcmp(sparc_pmu_type, "niagara4") ||
1705             !strcmp(sparc_pmu_type, "niagara5")) {
1706                 sparc_pmu = &niagara4_pmu;
1707                 return true;
1708         }
1709         if (!strcmp(sparc_pmu_type, "sparc-m7")) {
1710                 sparc_pmu = &sparc_m7_pmu;
1711                 return true;
1712         }
1713         return false;
1714 }
1715 
1716 static int __init init_hw_perf_events(void)
1717 {
1718         int err;
1719 
1720         pr_info("Performance events: ");
1721 
1722         err = pcr_arch_init();
1723         if (err || !supported_pmu()) {
1724                 pr_cont("No support for PMU type '%s'\n", sparc_pmu_type);
1725                 return 0;
1726         }
1727 
1728         pr_cont("Supported PMU type is '%s'\n", sparc_pmu_type);
1729 
1730         perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW);
1731         register_die_notifier(&perf_event_nmi_notifier);
1732 
1733         return 0;
1734 }
1735 pure_initcall(init_hw_perf_events);
1736 
1737 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
1738                            struct pt_regs *regs)
1739 {
1740         unsigned long ksp, fp;
1741 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1742         int graph = 0;
1743 #endif
1744 
1745         stack_trace_flush();
1746 
1747         perf_callchain_store(entry, regs->tpc);
1748 
1749         ksp = regs->u_regs[UREG_I6];
1750         fp = ksp + STACK_BIAS;
1751         do {
1752                 struct sparc_stackf *sf;
1753                 struct pt_regs *regs;
1754                 unsigned long pc;
1755 
1756                 if (!kstack_valid(current_thread_info(), fp))
1757                         break;
1758 
1759                 sf = (struct sparc_stackf *) fp;
1760                 regs = (struct pt_regs *) (sf + 1);
1761 
1762                 if (kstack_is_trap_frame(current_thread_info(), regs)) {
1763                         if (user_mode(regs))
1764                                 break;
1765                         pc = regs->tpc;
1766                         fp = regs->u_regs[UREG_I6] + STACK_BIAS;
1767                 } else {
1768                         pc = sf->callers_pc;
1769                         fp = (unsigned long)sf->fp + STACK_BIAS;
1770                 }
1771                 perf_callchain_store(entry, pc);
1772 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1773                 if ((pc + 8UL) == (unsigned long) &return_to_handler) {
1774                         struct ftrace_ret_stack *ret_stack;
1775                         ret_stack = ftrace_graph_get_ret_stack(current,
1776                                                                graph);
1777                         if (ret_stack) {
1778                                 pc = ret_stack->ret;
1779                                 perf_callchain_store(entry, pc);
1780                                 graph++;
1781                         }
1782                 }
1783 #endif
1784         } while (entry->nr < entry->max_stack);
1785 }
1786 
1787 static inline int
1788 valid_user_frame(const void __user *fp, unsigned long size)
1789 {
1790         /* addresses should be at least 4-byte aligned */
1791         if (((unsigned long) fp) & 3)
1792                 return 0;
1793 
1794         return (__range_not_ok(fp, size, TASK_SIZE) == 0);
1795 }
1796 
1797 static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
1798                                    struct pt_regs *regs)
1799 {
1800         unsigned long ufp;
1801 
1802         ufp = regs->u_regs[UREG_FP] + STACK_BIAS;
1803         do {
1804                 struct sparc_stackf __user *usf;
1805                 struct sparc_stackf sf;
1806                 unsigned long pc;
1807 
1808                 usf = (struct sparc_stackf __user *)ufp;
1809                 if (!valid_user_frame(usf, sizeof(sf)))
1810                         break;
1811 
1812                 if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1813                         break;
1814 
1815                 pc = sf.callers_pc;
1816                 ufp = (unsigned long)sf.fp + STACK_BIAS;
1817                 perf_callchain_store(entry, pc);
1818         } while (entry->nr < entry->max_stack);
1819 }
1820 
1821 static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
1822                                    struct pt_regs *regs)
1823 {
1824         unsigned long ufp;
1825 
1826         ufp = regs->u_regs[UREG_FP] & 0xffffffffUL;
1827         do {
1828                 unsigned long pc;
1829 
1830                 if (thread32_stack_is_64bit(ufp)) {
1831                         struct sparc_stackf __user *usf;
1832                         struct sparc_stackf sf;
1833 
1834                         ufp += STACK_BIAS;
1835                         usf = (struct sparc_stackf __user *)ufp;
1836                         if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1837                                 break;
1838                         pc = sf.callers_pc & 0xffffffff;
1839                         ufp = ((unsigned long) sf.fp) & 0xffffffff;
1840                 } else {
1841                         struct sparc_stackf32 __user *usf;
1842                         struct sparc_stackf32 sf;
1843                         usf = (struct sparc_stackf32 __user *)ufp;
1844                         if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1845                                 break;
1846                         pc = sf.callers_pc;
1847                         ufp = (unsigned long)sf.fp;
1848                 }
1849                 perf_callchain_store(entry, pc);
1850         } while (entry->nr < entry->max_stack);
1851 }
1852 
1853 void
1854 perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
1855 {
1856         u64 saved_fault_address = current_thread_info()->fault_address;
1857         u8 saved_fault_code = get_thread_fault_code();
1858 
1859         perf_callchain_store(entry, regs->tpc);
1860 
1861         if (!current->mm)
1862                 return;
1863 
1864         flushw_user();
1865 
1866         pagefault_disable();
1867 
1868         if (test_thread_flag(TIF_32BIT))
1869                 perf_callchain_user_32(entry, regs);
1870         else
1871                 perf_callchain_user_64(entry, regs);
1872 
1873         pagefault_enable();
1874 
1875         set_thread_fault_code(saved_fault_code);
1876         current_thread_info()->fault_address = saved_fault_address;
1877 }
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root/arch/sparc/kernel/perf_event.c

DEFINITIONS
