SAFE public projects git trees. - safe/jmp/linux-2.6/blob - arch/powerpc/oprofile/op_model_cell.c

   1 /*
   2  * Cell Broadband Engine OProfile Support
   3  *
   4  * (C) Copyright IBM Corporation 2006
   5  *
   6  * Author: David Erb (djerb@us.ibm.com)
   7  * Modifications:
   8  *         Carl Love <carll@us.ibm.com>
   9  *         Maynard Johnson <maynardj@us.ibm.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version
  14  * 2 of the License, or (at your option) any later version.
  15  */
  16
  17 #include <linux/cpufreq.h>
  18 #include <linux/delay.h>
  19 #include <linux/init.h>
  20 #include <linux/jiffies.h>
  21 #include <linux/kthread.h>
  22 #include <linux/oprofile.h>
  23 #include <linux/percpu.h>
  24 #include <linux/smp.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/timer.h>
  27 #include <asm/cell-pmu.h>
  28 #include <asm/cputable.h>
  29 #include <asm/firmware.h>
  30 #include <asm/io.h>
  31 #include <asm/oprofile_impl.h>
  32 #include <asm/processor.h>
  33 #include <asm/prom.h>
  34 #include <asm/ptrace.h>
  35 #include <asm/reg.h>
  36 #include <asm/rtas.h>
  37 #include <asm/system.h>
  38
  39 #include "../platforms/cell/interrupt.h"
  40 #include "../platforms/cell/cbe_regs.h"
  41
  42 #define PPU_CYCLES_EVENT_NUM 1  /*  event number for CYCLES */
  43 #define PPU_CYCLES_GRP_NUM   1  /* special group number for identifying
  44                                  * PPU_CYCLES event
  45                                  */
  46 #define CBE_COUNT_ALL_CYCLES 0x42800000 /* PPU cycle event specifier */
  47
  48 #define NUM_THREADS 2         /* number of physical threads in
  49                                * physical processor
  50                                */
  51 #define NUM_TRACE_BUS_WORDS 4
  52 #define NUM_INPUT_BUS_WORDS 2
  53
  54
  55 struct pmc_cntrl_data {
  56         unsigned long vcntr;
  57         unsigned long evnts;
  58         unsigned long masks;
  59         unsigned long enabled;
  60 };
  61
  62 /*
  63  * ibm,cbe-perftools rtas parameters
  64  */
  65
  66 struct pm_signal {
  67         u16 cpu;                /* Processor to modify */
  68         u16 sub_unit;           /* hw subunit this applies to (if applicable) */
  69         short int signal_group; /* Signal Group to Enable/Disable */
  70         u8 bus_word;            /* Enable/Disable on this Trace/Trigger/Event
  71                                  * Bus Word(s) (bitmask)
  72                                  */
  73         u8 bit;                 /* Trigger/Event bit (if applicable) */
  74 };
  75
  76 /*
  77  * rtas call arguments
  78  */
  79 enum {
  80         SUBFUNC_RESET = 1,
  81         SUBFUNC_ACTIVATE = 2,
  82         SUBFUNC_DEACTIVATE = 3,
  83
  84         PASSTHRU_IGNORE = 0,
  85         PASSTHRU_ENABLE = 1,
  86         PASSTHRU_DISABLE = 2,
  87 };
  88
  89 struct pm_cntrl {
  90         u16 enable;
  91         u16 stop_at_max;
  92         u16 trace_mode;
  93         u16 freeze;
  94         u16 count_mode;
  95 };
  96
  97 static struct {
  98         u32 group_control;
  99         u32 debug_bus_control;
 100         struct pm_cntrl pm_cntrl;
 101         u32 pm07_cntrl[NR_PHYS_CTRS];
 102 } pm_regs;
 103
 104 #define GET_SUB_UNIT(x) ((x & 0x0000f000) >> 12)
 105 #define GET_BUS_WORD(x) ((x & 0x000000f0) >> 4)
 106 #define GET_BUS_TYPE(x) ((x & 0x00000300) >> 8)
 107 #define GET_POLARITY(x) ((x & 0x00000002) >> 1)
 108 #define GET_COUNT_CYCLES(x) (x & 0x00000001)
 109 #define GET_INPUT_CONTROL(x) ((x & 0x00000004) >> 2)
 110
 111 static DEFINE_PER_CPU(unsigned long[NR_PHYS_CTRS], pmc_values);
 112
 113 static struct pmc_cntrl_data pmc_cntrl[NUM_THREADS][NR_PHYS_CTRS];
 114
 115 /* Interpetation of hdw_thread:
 116  * 0 - even virtual cpus 0, 2, 4,...
 117  * 1 - odd virtual cpus 1, 3, 5, ...
 118  */
 119 static u32 hdw_thread;
 120
 121 static u32 virt_cntr_inter_mask;
 122 static struct timer_list timer_virt_cntr;
 123
 124 /* pm_signal needs to be global since it is initialized in
 125  * cell_reg_setup at the time when the necessary information
 126  * is available.
 127  */
 128 static struct pm_signal pm_signal[NR_PHYS_CTRS];
 129 static int pm_rtas_token;
 130
 131 static u32 reset_value[NR_PHYS_CTRS];
 132 static int num_counters;
 133 static int oprofile_running;
 134 static DEFINE_SPINLOCK(virt_cntr_lock);
 135
 136 static u32 ctr_enabled;
 137
 138 static unsigned char trace_bus[NUM_TRACE_BUS_WORDS];
 139 static unsigned char input_bus[NUM_INPUT_BUS_WORDS];
 140
 141 /*
 142  * Firmware interface functions
 143  */
 144 static int
 145 rtas_ibm_cbe_perftools(int subfunc, int passthru,
 146                        void *address, unsigned long length)
 147 {
 148         u64 paddr = __pa(address);
 149
 150         return rtas_call(pm_rtas_token, 5, 1, NULL, subfunc, passthru,
 151                          paddr >> 32, paddr & 0xffffffff, length);
 152 }
 153
 154 static void pm_rtas_reset_signals(u32 node)
 155 {
 156         int ret;
 157         struct pm_signal pm_signal_local;
 158
 159         /*  The debug bus is being set to the passthru disable state.
 160          *  However, the FW still expects atleast one legal signal routing
 161          *  entry or it will return an error on the arguments.  If we don't
 162          *  supply a valid entry, we must ignore all return values.  Ignoring
 163          *  all return values means we might miss an error we should be
 164          *  concerned about.
 165          */
 166
 167         /*  fw expects physical cpu #. */
 168         pm_signal_local.cpu = node;
 169         pm_signal_local.signal_group = 21;
 170         pm_signal_local.bus_word = 1;
 171         pm_signal_local.sub_unit = 0;
 172         pm_signal_local.bit = 0;
 173
 174         ret = rtas_ibm_cbe_perftools(SUBFUNC_RESET, PASSTHRU_DISABLE,
 175                                      &pm_signal_local,
 176                                      sizeof(struct pm_signal));
 177
 178         if (ret)
 179                 printk(KERN_WARNING "%s: rtas returned: %d\n",
 180                        __FUNCTION__, ret);
 181 }
 182
 183 static void pm_rtas_activate_signals(u32 node, u32 count)
 184 {
 185         int ret;
 186         int i, j;
 187         struct pm_signal pm_signal_local[NR_PHYS_CTRS];
 188
 189         /* There is no debug setup required for the cycles event.
 190          * Note that only events in the same group can be used.
 191          * Otherwise, there will be conflicts in correctly routing
 192          * the signals on the debug bus.  It is the responsiblity
 193          * of the OProfile user tool to check the events are in
 194          * the same group.
 195          */
 196         i = 0;
 197         for (j = 0; j < count; j++) {
 198                 if (pm_signal[j].signal_group != PPU_CYCLES_GRP_NUM) {
 199
 200                         /* fw expects physical cpu # */
 201                         pm_signal_local[i].cpu = node;
 202                         pm_signal_local[i].signal_group
 203                                 = pm_signal[j].signal_group;
 204                         pm_signal_local[i].bus_word = pm_signal[j].bus_word;
 205                         pm_signal_local[i].sub_unit = pm_signal[j].sub_unit;
 206                         pm_signal_local[i].bit = pm_signal[j].bit;
 207                         i++;
 208                 }
 209         }
 210
 211         if (i != 0) {
 212                 ret = rtas_ibm_cbe_perftools(SUBFUNC_ACTIVATE, PASSTHRU_ENABLE,
 213                                              pm_signal_local,
 214                                              i * sizeof(struct pm_signal));
 215
 216                 if (ret)
 217                         printk(KERN_WARNING "%s: rtas returned: %d\n",
 218                                __FUNCTION__, ret);
 219         }
 220 }
 221
 222 /*
 223  * PM Signal functions
 224  */
 225 static void set_pm_event(u32 ctr, int event, u32 unit_mask)
 226 {
 227         struct pm_signal *p;
 228         u32 signal_bit;
 229         u32 bus_word, bus_type, count_cycles, polarity, input_control;
 230         int j, i;
 231
 232         if (event == PPU_CYCLES_EVENT_NUM) {
 233                 /* Special Event: Count all cpu cycles */
 234                 pm_regs.pm07_cntrl[ctr] = CBE_COUNT_ALL_CYCLES;
 235                 p = &(pm_signal[ctr]);
 236                 p->signal_group = PPU_CYCLES_GRP_NUM;
 237                 p->bus_word = 1;
 238                 p->sub_unit = 0;
 239                 p->bit = 0;
 240                 goto out;
 241         } else {
 242                 pm_regs.pm07_cntrl[ctr] = 0;
 243         }
 244
 245         bus_word = GET_BUS_WORD(unit_mask);
 246         bus_type = GET_BUS_TYPE(unit_mask);
 247         count_cycles = GET_COUNT_CYCLES(unit_mask);
 248         polarity = GET_POLARITY(unit_mask);
 249         input_control = GET_INPUT_CONTROL(unit_mask);
 250         signal_bit = (event % 100);
 251
 252         p = &(pm_signal[ctr]);
 253
 254         p->signal_group = event / 100;
 255         p->bus_word = bus_word;
 256         p->sub_unit = (unit_mask & 0x0000f000) >> 12;
 257
 258         pm_regs.pm07_cntrl[ctr] = 0;
 259         pm_regs.pm07_cntrl[ctr] |= PM07_CTR_COUNT_CYCLES(count_cycles);
 260         pm_regs.pm07_cntrl[ctr] |= PM07_CTR_POLARITY(polarity);
 261         pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_CONTROL(input_control);
 262
 263         /* Some of the islands signal selection is based on 64 bit words.
 264          * The debug bus words are 32 bits, the input words to the performance
 265          * counters are defined as 32 bits.  Need to convert the 64 bit island
 266          * specification to the appropriate 32 input bit and bus word for the
 267          * performance counter event selection.  See the CELL Performance
 268          * monitoring signals manual and the Perf cntr hardware descriptions
 269          * for the details.
 270          */
 271         if (input_control == 0) {
 272                 if (signal_bit > 31) {
 273                         signal_bit -= 32;
 274                         if (bus_word == 0x3)
 275                                 bus_word = 0x2;
 276                         else if (bus_word == 0xc)
 277                                 bus_word = 0x8;
 278                 }
 279
 280                 if ((bus_type == 0) && p->signal_group >= 60)
 281                         bus_type = 2;
 282                 if ((bus_type == 1) && p->signal_group >= 50)
 283                         bus_type = 0;
 284
 285                 pm_regs.pm07_cntrl[ctr] |= PM07_CTR_INPUT_MUX(signal_bit);
 286         } else {
 287                 pm_regs.pm07_cntrl[ctr] = 0;
 288                 p->bit = signal_bit;
 289         }
 290
 291         for (i = 0; i < NUM_TRACE_BUS_WORDS; i++) {
 292                 if (bus_word & (1 << i)) {
 293                         pm_regs.debug_bus_control |=
 294                             (bus_type << (31 - (2 * i) + 1));
 295
 296                         for (j = 0; j < NUM_INPUT_BUS_WORDS; j++) {
 297                                 if (input_bus[j] == 0xff) {
 298                                         input_bus[j] = i;
 299                                         pm_regs.group_control |=
 300                                             (i << (31 - i));
 301                                         break;
 302                                 }
 303                         }
 304                 }
 305         }
 306 out:
 307         ;
 308 }
 309
 310 static void write_pm_cntrl(int cpu)
 311 {
 312         /* Oprofile will use 32 bit counters, set bits 7:10 to 0
 313          * pmregs.pm_cntrl is a global
 314          */
 315
 316         u32 val = 0;
 317         if (pm_regs.pm_cntrl.enable == 1)
 318                 val |= CBE_PM_ENABLE_PERF_MON;
 319
 320         if (pm_regs.pm_cntrl.stop_at_max == 1)
 321                 val |= CBE_PM_STOP_AT_MAX;
 322
 323         if (pm_regs.pm_cntrl.trace_mode == 1)
 324                 val |= CBE_PM_TRACE_MODE_SET(pm_regs.pm_cntrl.trace_mode);
 325
 326         if (pm_regs.pm_cntrl.freeze == 1)
 327                 val |= CBE_PM_FREEZE_ALL_CTRS;
 328
 329         /* Routine set_count_mode must be called previously to set
 330          * the count mode based on the user selection of user and kernel.
 331          */
 332         val |= CBE_PM_COUNT_MODE_SET(pm_regs.pm_cntrl.count_mode);
 333         cbe_write_pm(cpu, pm_control, val);
 334 }
 335
 336 static inline void
 337 set_count_mode(u32 kernel, u32 user)
 338 {
 339         /* The user must specify user and kernel if they want them. If
 340          *  neither is specified, OProfile will count in hypervisor mode.
 341          *  pm_regs.pm_cntrl is a global
 342          */
 343         if (kernel) {
 344                 if (user)
 345                         pm_regs.pm_cntrl.count_mode = CBE_COUNT_ALL_MODES;
 346                 else
 347                         pm_regs.pm_cntrl.count_mode =
 348                                 CBE_COUNT_SUPERVISOR_MODE;
 349         } else {
 350                 if (user)
 351                         pm_regs.pm_cntrl.count_mode = CBE_COUNT_PROBLEM_MODE;
 352                 else
 353                         pm_regs.pm_cntrl.count_mode =
 354                                 CBE_COUNT_HYPERVISOR_MODE;
 355         }
 356 }
 357
 358 static inline void enable_ctr(u32 cpu, u32 ctr, u32 * pm07_cntrl)
 359 {
 360
 361         pm07_cntrl[ctr] |= CBE_PM_CTR_ENABLE;
 362         cbe_write_pm07_control(cpu, ctr, pm07_cntrl[ctr]);
 363 }
 364
 365 /*
 366  * Oprofile is expected to collect data on all CPUs simultaneously.
 367  * However, there is one set of performance counters per node.  There are
 368  * two hardware threads or virtual CPUs on each node.  Hence, OProfile must
 369  * multiplex in time the performance counter collection on the two virtual
 370  * CPUs.  The multiplexing of the performance counters is done by this
 371  * virtual counter routine.
 372  *
 373  * The pmc_values used below is defined as 'per-cpu' but its use is
 374  * more akin to 'per-node'.  We need to store two sets of counter
 375  * values per node -- one for the previous run and one for the next.
 376  * The per-cpu[NR_PHYS_CTRS] gives us the storage we need.  Each odd/even
 377  * pair of per-cpu arrays is used for storing the previous and next
 378  * pmc values for a given node.
 379  * NOTE: We use the per-cpu variable to improve cache performance.
 380  */
 381 static void cell_virtual_cntr(unsigned long data)
 382 {
 383         /* This routine will alternate loading the virtual counters for
 384          * virtual CPUs
 385          */
 386         int i, prev_hdw_thread, next_hdw_thread;
 387         u32 cpu;
 388         unsigned long flags;
 389
 390         /* Make sure that the interrupt_hander and
 391          * the virt counter are not both playing with
 392          * the counters on the same node.
 393          */
 394
 395         spin_lock_irqsave(&virt_cntr_lock, flags);
 396
 397         prev_hdw_thread = hdw_thread;
 398
 399         /* switch the cpu handling the interrupts */
 400         hdw_thread = 1 ^ hdw_thread;
 401         next_hdw_thread = hdw_thread;
 402
 403         for (i = 0; i < num_counters; i++)
 404         /* There are some per thread events.  Must do the
 405          * set event, for the thread that is being started
 406          */
 407                 set_pm_event(i,
 408                         pmc_cntrl[next_hdw_thread][i].evnts,
 409                         pmc_cntrl[next_hdw_thread][i].masks);
 410
 411         /* The following is done only once per each node, but
 412          * we need cpu #, not node #, to pass to the cbe_xxx functions.
 413          */
 414         for_each_online_cpu(cpu) {
 415                 if (cbe_get_hw_thread_id(cpu))
 416                         continue;
 417
 418                 /* stop counters, save counter values, restore counts
 419                  * for previous thread
 420                  */
 421                 cbe_disable_pm(cpu);
 422                 cbe_disable_pm_interrupts(cpu);
 423                 for (i = 0; i < num_counters; i++) {
 424                         per_cpu(pmc_values, cpu + prev_hdw_thread)[i]
 425                             = cbe_read_ctr(cpu, i);
 426
 427                         if (per_cpu(pmc_values, cpu + next_hdw_thread)[i]
 428                             == 0xFFFFFFFF)
 429                                 /* If the cntr value is 0xffffffff, we must
 430                                  * reset that to 0xfffffff0 when the current
 431                                  * thread is restarted.  This will generate a
 432                                  * new interrupt and make sure that we never
 433                                  * restore the counters to the max value.  If
 434                                  * the counters were restored to the max value,
 435                                  * they do not increment and no interrupts are
 436                                  * generated.  Hence no more samples will be
 437                                  * collected on that cpu.
 438                                  */
 439                                 cbe_write_ctr(cpu, i, 0xFFFFFFF0);
 440                         else
 441                                 cbe_write_ctr(cpu, i,
 442                                               per_cpu(pmc_values,
 443                                                       cpu +
 444                                                       next_hdw_thread)[i]);
 445                 }
 446
 447                 /* Switch to the other thread. Change the interrupt
 448                  * and control regs to be scheduled on the CPU
 449                  * corresponding to the thread to execute.
 450                  */
 451                 for (i = 0; i < num_counters; i++) {
 452                         if (pmc_cntrl[next_hdw_thread][i].enabled) {
 453                                 /* There are some per thread events.
 454                                  * Must do the set event, enable_cntr
 455                                  * for each cpu.
 456                                  */
 457                                 enable_ctr(cpu, i,
 458                                            pm_regs.pm07_cntrl);
 459                         } else {
 460                                 cbe_write_pm07_control(cpu, i, 0);
 461                         }
 462                 }
 463
 464                 /* Enable interrupts on the CPU thread that is starting */
 465                 cbe_enable_pm_interrupts(cpu, next_hdw_thread,
 466                                          virt_cntr_inter_mask);
 467                 cbe_enable_pm(cpu);
 468         }
 469
 470         spin_unlock_irqrestore(&virt_cntr_lock, flags);
 471
 472         mod_timer(&timer_virt_cntr, jiffies + HZ / 10);
 473 }
 474
 475 static void start_virt_cntrs(void)
 476 {
 477         init_timer(&timer_virt_cntr);
 478         timer_virt_cntr.function = cell_virtual_cntr;
 479         timer_virt_cntr.data = 0UL;
 480         timer_virt_cntr.expires = jiffies + HZ / 10;
 481         add_timer(&timer_virt_cntr);
 482 }
 483
 484 /* This function is called once for all cpus combined */
 485 static void
 486 cell_reg_setup(struct op_counter_config *ctr,
 487                struct op_system_config *sys, int num_ctrs)
 488 {
 489         int i, j, cpu;
 490
 491         pm_rtas_token = rtas_token("ibm,cbe-perftools");
 492         if (pm_rtas_token == RTAS_UNKNOWN_SERVICE) {
 493                 printk(KERN_WARNING "%s: RTAS_UNKNOWN_SERVICE\n",
 494                        __FUNCTION__);
 495                 goto out;
 496         }
 497
 498         num_counters = num_ctrs;
 499
 500         pm_regs.group_control = 0;
 501         pm_regs.debug_bus_control = 0;
 502
 503         /* setup the pm_control register */
 504         memset(&pm_regs.pm_cntrl, 0, sizeof(struct pm_cntrl));
 505         pm_regs.pm_cntrl.stop_at_max = 1;
 506         pm_regs.pm_cntrl.trace_mode = 0;
 507         pm_regs.pm_cntrl.freeze = 1;
 508
 509         set_count_mode(sys->enable_kernel, sys->enable_user);
 510
 511         /* Setup the thread 0 events */
 512         for (i = 0; i < num_ctrs; ++i) {
 513
 514                 pmc_cntrl[0][i].evnts = ctr[i].event;
 515                 pmc_cntrl[0][i].masks = ctr[i].unit_mask;
 516                 pmc_cntrl[0][i].enabled = ctr[i].enabled;
 517                 pmc_cntrl[0][i].vcntr = i;
 518
 519                 for_each_possible_cpu(j)
 520                         per_cpu(pmc_values, j)[i] = 0;
 521         }
 522
 523         /* Setup the thread 1 events, map the thread 0 event to the
 524          * equivalent thread 1 event.
 525          */
 526         for (i = 0; i < num_ctrs; ++i) {
 527                 if ((ctr[i].event >= 2100) && (ctr[i].event <= 2111))
 528                         pmc_cntrl[1][i].evnts = ctr[i].event + 19;
 529                 else if (ctr[i].event == 2203)
 530                         pmc_cntrl[1][i].evnts = ctr[i].event;
 531                 else if ((ctr[i].event >= 2200) && (ctr[i].event <= 2215))
 532                         pmc_cntrl[1][i].evnts = ctr[i].event + 16;
 533                 else
 534                         pmc_cntrl[1][i].evnts = ctr[i].event;
 535
 536                 pmc_cntrl[1][i].masks = ctr[i].unit_mask;
 537                 pmc_cntrl[1][i].enabled = ctr[i].enabled;
 538                 pmc_cntrl[1][i].vcntr = i;
 539         }
 540
 541         for (i = 0; i < NUM_TRACE_BUS_WORDS; i++)
 542                 trace_bus[i] = 0xff;
 543
 544         for (i = 0; i < NUM_INPUT_BUS_WORDS; i++)
 545                 input_bus[i] = 0xff;
 546
 547         /* Our counters count up, and "count" refers to
 548          * how much before the next interrupt, and we interrupt
 549          * on overflow.  So we calculate the starting value
 550          * which will give us "count" until overflow.
 551          * Then we set the events on the enabled counters.
 552          */
 553         for (i = 0; i < num_counters; ++i) {
 554                 /* start with virtual counter set 0 */
 555                 if (pmc_cntrl[0][i].enabled) {
 556                         /* Using 32bit counters, reset max - count */
 557                         reset_value[i] = 0xFFFFFFFF - ctr[i].count;
 558                         set_pm_event(i,
 559                                      pmc_cntrl[0][i].evnts,
 560                                      pmc_cntrl[0][i].masks);
 561
 562                         /* global, used by cell_cpu_setup */
 563                         ctr_enabled |= (1 << i);
 564                 }
 565         }
 566
 567         /* initialize the previous counts for the virtual cntrs */
 568         for_each_online_cpu(cpu)
 569                 for (i = 0; i < num_counters; ++i) {
 570                         per_cpu(pmc_values, cpu)[i] = reset_value[i];
 571                 }
 572 out:
 573         ;
 574 }
 575
 576 /* This function is called once for each cpu */
 577 static void cell_cpu_setup(struct op_counter_config *cntr)
 578 {
 579         u32 cpu = smp_processor_id();
 580         u32 num_enabled = 0;
 581         int i;
 582
 583         /* There is one performance monitor per processor chip (i.e. node),
 584          * so we only need to perform this function once per node.
 585          */
 586         if (cbe_get_hw_thread_id(cpu))
 587                 goto out;
 588
 589         if (pm_rtas_token == RTAS_UNKNOWN_SERVICE) {
 590                 printk(KERN_WARNING "%s: RTAS_UNKNOWN_SERVICE\n",
 591                        __FUNCTION__);
 592                 goto out;
 593         }
 594
 595         /* Stop all counters */
 596         cbe_disable_pm(cpu);
 597         cbe_disable_pm_interrupts(cpu);
 598
 599         cbe_write_pm(cpu, pm_interval, 0);
 600         cbe_write_pm(cpu, pm_start_stop, 0);
 601         cbe_write_pm(cpu, group_control, pm_regs.group_control);
 602         cbe_write_pm(cpu, debug_bus_control, pm_regs.debug_bus_control);
 603         write_pm_cntrl(cpu);
 604
 605         for (i = 0; i < num_counters; ++i) {
 606                 if (ctr_enabled & (1 << i)) {
 607                         pm_signal[num_enabled].cpu = cbe_cpu_to_node(cpu);
 608                         num_enabled++;
 609                 }
 610         }
 611
 612         pm_rtas_activate_signals(cbe_cpu_to_node(cpu), num_enabled);
 613 out:
 614         ;
 615 }
 616
 617 static void cell_global_start(struct op_counter_config *ctr)
 618 {
 619         u32 cpu;
 620         u32 interrupt_mask = 0;
 621         u32 i;
 622
 623         /* This routine gets called once for the system.
 624          * There is one performance monitor per node, so we
 625          * only need to perform this function once per node.
 626          */
 627         for_each_online_cpu(cpu) {
 628                 if (cbe_get_hw_thread_id(cpu))
 629                         continue;
 630
 631                 interrupt_mask = 0;
 632
 633                 for (i = 0; i < num_counters; ++i) {
 634                         if (ctr_enabled & (1 << i)) {
 635                                 cbe_write_ctr(cpu, i, reset_value[i]);
 636                                 enable_ctr(cpu, i, pm_regs.pm07_cntrl);
 637                                 interrupt_mask |=
 638                                     CBE_PM_CTR_OVERFLOW_INTR(i);
 639                         } else {
 640                                 /* Disable counter */
 641                                 cbe_write_pm07_control(cpu, i, 0);
 642                         }
 643                 }
 644
 645                 cbe_get_and_clear_pm_interrupts(cpu);
 646                 cbe_enable_pm_interrupts(cpu, hdw_thread, interrupt_mask);
 647                 cbe_enable_pm(cpu);
 648         }
 649
 650         virt_cntr_inter_mask = interrupt_mask;
 651         oprofile_running = 1;
 652         smp_wmb();
 653
 654         /* NOTE: start_virt_cntrs will result in cell_virtual_cntr() being
 655          * executed which manipulates the PMU.  We start the "virtual counter"
 656          * here so that we do not need to synchronize access to the PMU in
 657          * the above for-loop.
 658          */
 659         start_virt_cntrs();
 660 }
 661
 662 static void cell_global_stop(void)
 663 {
 664         int cpu;
 665
 666         /* This routine will be called once for the system.
 667          * There is one performance monitor per node, so we
 668          * only need to perform this function once per node.
 669          */
 670         del_timer_sync(&timer_virt_cntr);
 671         oprofile_running = 0;
 672         smp_wmb();
 673
 674         for_each_online_cpu(cpu) {
 675                 if (cbe_get_hw_thread_id(cpu))
 676                         continue;
 677
 678                 cbe_sync_irq(cbe_cpu_to_node(cpu));
 679                 /* Stop the counters */
 680                 cbe_disable_pm(cpu);
 681
 682                 /* Deactivate the signals */
 683                 pm_rtas_reset_signals(cbe_cpu_to_node(cpu));
 684
 685                 /* Deactivate interrupts */
 686                 cbe_disable_pm_interrupts(cpu);
 687         }
 688 }
 689
 690 static void
 691 cell_handle_interrupt(struct pt_regs *regs, struct op_counter_config *ctr)
 692 {
 693         u32 cpu;
 694         u64 pc;
 695         int is_kernel;
 696         unsigned long flags = 0;
 697         u32 interrupt_mask;
 698         int i;
 699
 700         cpu = smp_processor_id();
 701
 702         /* Need to make sure the interrupt handler and the virt counter
 703          * routine are not running at the same time. See the
 704          * cell_virtual_cntr() routine for additional comments.
 705          */
 706         spin_lock_irqsave(&virt_cntr_lock, flags);
 707
 708         /* Need to disable and reenable the performance counters
 709          * to get the desired behavior from the hardware.  This
 710          * is hardware specific.
 711          */
 712
 713         cbe_disable_pm(cpu);
 714
 715         interrupt_mask = cbe_get_and_clear_pm_interrupts(cpu);
 716
 717         /* If the interrupt mask has been cleared, then the virt cntr
 718          * has cleared the interrupt.  When the thread that generated
 719          * the interrupt is restored, the data count will be restored to
 720          * 0xffffff0 to cause the interrupt to be regenerated.
 721          */
 722
 723         if ((oprofile_running == 1) && (interrupt_mask != 0)) {
 724                 pc = regs->nip;
 725                 is_kernel = is_kernel_addr(pc);
 726
 727                 for (i = 0; i < num_counters; ++i) {
 728                         if ((interrupt_mask & CBE_PM_CTR_OVERFLOW_INTR(i))
 729                             && ctr[i].enabled) {
 730                                 oprofile_add_pc(pc, is_kernel, i);
 731                                 cbe_write_ctr(cpu, i, reset_value[i]);
 732                         }
 733                 }
 734
 735                 /* The counters were frozen by the interrupt.
 736                  * Reenable the interrupt and restart the counters.
 737                  * If there was a race between the interrupt handler and
 738                  * the virtual counter routine.  The virutal counter
 739                  * routine may have cleared the interrupts.  Hence must
 740                  * use the virt_cntr_inter_mask to re-enable the interrupts.
 741                  */
 742                 cbe_enable_pm_interrupts(cpu, hdw_thread,
 743                                          virt_cntr_inter_mask);
 744
 745                 /* The writes to the various performance counters only writes
 746                  * to a latch.  The new values (interrupt setting bits, reset
 747                  * counter value etc.) are not copied to the actual registers
 748                  * until the performance monitor is enabled.  In order to get
 749                  * this to work as desired, the permormance monitor needs to
 750                  * be disabled while writting to the latches.  This is a
 751                  * HW design issue.
 752                  */
 753                 cbe_enable_pm(cpu);
 754         }
 755         spin_unlock_irqrestore(&virt_cntr_lock, flags);
 756 }
 757
 758 struct op_powerpc_model op_model_cell = {
 759         .reg_setup = cell_reg_setup,
 760         .cpu_setup = cell_cpu_setup,
 761         .global_start = cell_global_start,
 762         .global_stop = cell_global_stop,
 763         .handle_interrupt = cell_handle_interrupt,
 764 };