arch/mips/oprofile/op_model_mipsxx.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2004, 05, 06 by Ralf Baechle
   7  * Copyright (C) 2005 by MIPS Technologies, Inc.
   8  */
   9 #include <linux/cpumask.h>
  10 #include <linux/oprofile.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/smp.h>
  13 #include <asm/irq_regs.h>
  14 #include <asm/time.h>
  15
  16 #include "op_impl.h"
  17
  18 #define M_PERFCTL_EVENT(event)          (((event) << MIPS_PERFCTRL_EVENT_S) & \
  19                                          MIPS_PERFCTRL_EVENT)
  20 #define M_PERFCTL_VPEID(vpe)            ((vpe)    << MIPS_PERFCTRL_VPEID_S)
  21
  22 #define M_COUNTER_OVERFLOW              (1UL      << 31)
  23
  24 static int (*save_perf_irq)(void);
  25 static int perfcount_irq;
  26
  27 /*
  28  * XLR has only one set of counters per core. Designate the
  29  * first hardware thread in the core for setup and init.
  30  * Skip CPUs with non-zero hardware thread id (4 hwt per core)
  31  */
  32 #if defined(CONFIG_CPU_XLR) && defined(CONFIG_SMP)
  33 #define oprofile_skip_cpu(c)    ((cpu_logical_map(c) & 0x3) != 0)
  34 #else
  35 #define oprofile_skip_cpu(c)    0
  36 #endif
  37
  38 #ifdef CONFIG_MIPS_MT_SMP
  39 #define WHAT            (MIPS_PERFCTRL_MT_EN_VPE | \
  40                          M_PERFCTL_VPEID(cpu_vpe_id(&current_cpu_data)))
  41 #define vpe_id()        (cpu_has_mipsmt_pertccounters ? \
  42                         0 : cpu_vpe_id(&current_cpu_data))
  43
  44 /*
  45  * The number of bits to shift to convert between counters per core and
  46  * counters per VPE.  There is no reasonable interface atm to obtain the
  47  * number of VPEs used by Linux and in the 34K this number is fixed to two
  48  * anyways so we hardcore a few things here for the moment.  The way it's
  49  * done here will ensure that oprofile VSMP kernel will run right on a lesser
  50  * core like a 24K also or with maxcpus=1.
  51  */
  52 static inline unsigned int vpe_shift(void)
  53 {
  54         if (num_possible_cpus() > 1)
  55                 return 1;
  56
  57         return 0;
  58 }
  59
  60 #else
  61
  62 #define WHAT            0
  63 #define vpe_id()        0
  64
  65 static inline unsigned int vpe_shift(void)
  66 {
  67         return 0;
  68 }
  69
  70 #endif
  71
  72 static inline unsigned int counters_total_to_per_cpu(unsigned int counters)
  73 {
  74         return counters >> vpe_shift();
  75 }
  76
  77 static inline unsigned int counters_per_cpu_to_total(unsigned int counters)
  78 {
  79         return counters << vpe_shift();
  80 }
  81
  82 #define __define_perf_accessors(r, n, np)                               \
  83                                                                         \
  84 static inline unsigned int r_c0_ ## r ## n(void)                        \
  85 {                                                                       \
  86         unsigned int cpu = vpe_id();                                    \
  87                                                                         \
  88         switch (cpu) {                                                  \
  89         case 0:                                                         \
  90                 return read_c0_ ## r ## n();                            \
  91         case 1:                                                         \
  92                 return read_c0_ ## r ## np();                           \
  93         default:                                                        \
  94                 BUG();                                                  \
  95         }                                                               \
  96         return 0;                                                       \
  97 }                                                                       \
  98                                                                         \
  99 static inline void w_c0_ ## r ## n(unsigned int value)                  \
 100 {                                                                       \
 101         unsigned int cpu = vpe_id();                                    \
 102                                                                         \
 103         switch (cpu) {                                                  \
 104         case 0:                                                         \
 105                 write_c0_ ## r ## n(value);                             \
 106                 return;                                                 \
 107         case 1:                                                         \
 108                 write_c0_ ## r ## np(value);                            \
 109                 return;                                                 \
 110         default:                                                        \
 111                 BUG();                                                  \
 112         }                                                               \
 113         return;                                                         \
 114 }                                                                       \
 115
 116 __define_perf_accessors(perfcntr, 0, 2)
 117 __define_perf_accessors(perfcntr, 1, 3)
 118 __define_perf_accessors(perfcntr, 2, 0)
 119 __define_perf_accessors(perfcntr, 3, 1)
 120
 121 __define_perf_accessors(perfctrl, 0, 2)
 122 __define_perf_accessors(perfctrl, 1, 3)
 123 __define_perf_accessors(perfctrl, 2, 0)
 124 __define_perf_accessors(perfctrl, 3, 1)
 125
 126 struct op_mips_model op_model_mipsxx_ops;
 127
 128 static struct mipsxx_register_config {
 129         unsigned int control[4];
 130         unsigned int counter[4];
 131 } reg;
 132
 133 /* Compute all of the registers in preparation for enabling profiling.  */
 134
 135 static void mipsxx_reg_setup(struct op_counter_config *ctr)
 136 {
 137         unsigned int counters = op_model_mipsxx_ops.num_counters;
 138         int i;
 139
 140         /* Compute the performance counter control word.  */
 141         for (i = 0; i < counters; i++) {
 142                 reg.control[i] = 0;
 143                 reg.counter[i] = 0;
 144
 145                 if (!ctr[i].enabled)
 146                         continue;
 147
 148                 reg.control[i] = M_PERFCTL_EVENT(ctr[i].event) |
 149                                  MIPS_PERFCTRL_IE;
 150                 if (ctr[i].kernel)
 151                         reg.control[i] |= MIPS_PERFCTRL_K;
 152                 if (ctr[i].user)
 153                         reg.control[i] |= MIPS_PERFCTRL_U;
 154                 if (ctr[i].exl)
 155                         reg.control[i] |= MIPS_PERFCTRL_EXL;
 156                 if (boot_cpu_type() == CPU_XLR)
 157                         reg.control[i] |= XLR_PERFCTRL_ALLTHREADS;
 158                 reg.counter[i] = 0x80000000 - ctr[i].count;
 159         }
 160 }
 161
 162 /* Program all of the registers in preparation for enabling profiling.  */
 163
 164 static void mipsxx_cpu_setup(void *args)
 165 {
 166         unsigned int counters = op_model_mipsxx_ops.num_counters;
 167
 168         if (oprofile_skip_cpu(smp_processor_id()))
 169                 return;
 170
 171         switch (counters) {
 172         case 4:
 173                 w_c0_perfctrl3(0);
 174                 w_c0_perfcntr3(reg.counter[3]);
 175         case 3:
 176                 w_c0_perfctrl2(0);
 177                 w_c0_perfcntr2(reg.counter[2]);
 178         case 2:
 179                 w_c0_perfctrl1(0);
 180                 w_c0_perfcntr1(reg.counter[1]);
 181         case 1:
 182                 w_c0_perfctrl0(0);
 183                 w_c0_perfcntr0(reg.counter[0]);
 184         }
 185 }
 186
 187 /* Start all counters on current CPU */
 188 static void mipsxx_cpu_start(void *args)
 189 {
 190         unsigned int counters = op_model_mipsxx_ops.num_counters;
 191
 192         if (oprofile_skip_cpu(smp_processor_id()))
 193                 return;
 194
 195         switch (counters) {
 196         case 4:
 197                 w_c0_perfctrl3(WHAT | reg.control[3]);
 198         case 3:
 199                 w_c0_perfctrl2(WHAT | reg.control[2]);
 200         case 2:
 201                 w_c0_perfctrl1(WHAT | reg.control[1]);
 202         case 1:
 203                 w_c0_perfctrl0(WHAT | reg.control[0]);
 204         }
 205 }
 206
 207 /* Stop all counters on current CPU */
 208 static void mipsxx_cpu_stop(void *args)
 209 {
 210         unsigned int counters = op_model_mipsxx_ops.num_counters;
 211
 212         if (oprofile_skip_cpu(smp_processor_id()))
 213                 return;
 214
 215         switch (counters) {
 216         case 4:
 217                 w_c0_perfctrl3(0);
 218         case 3:
 219                 w_c0_perfctrl2(0);
 220         case 2:
 221                 w_c0_perfctrl1(0);
 222         case 1:
 223                 w_c0_perfctrl0(0);
 224         }
 225 }
 226
 227 static int mipsxx_perfcount_handler(void)
 228 {
 229         unsigned int counters = op_model_mipsxx_ops.num_counters;
 230         unsigned int control;
 231         unsigned int counter;
 232         int handled = IRQ_NONE;
 233
 234         if (cpu_has_mips_r2 && !(read_c0_cause() & CAUSEF_PCI))
 235                 return handled;
 236
 237         switch (counters) {
 238 #define HANDLE_COUNTER(n)                                               \
 239         case n + 1:                                                     \
 240                 control = r_c0_perfctrl ## n();                         \
 241                 counter = r_c0_perfcntr ## n();                         \
 242                 if ((control & MIPS_PERFCTRL_IE) &&                     \
 243                     (counter & M_COUNTER_OVERFLOW)) {                   \
 244                         oprofile_add_sample(get_irq_regs(), n);         \
 245                         w_c0_perfcntr ## n(reg.counter[n]);             \
 246                         handled = IRQ_HANDLED;                          \
 247                 }
 248         HANDLE_COUNTER(3)
 249         HANDLE_COUNTER(2)
 250         HANDLE_COUNTER(1)
 251         HANDLE_COUNTER(0)
 252         }
 253
 254         return handled;
 255 }
 256
 257 static inline int __n_counters(void)
 258 {
 259         if (!cpu_has_perf)
 260                 return 0;
 261         if (!(read_c0_perfctrl0() & MIPS_PERFCTRL_M))
 262                 return 1;
 263         if (!(read_c0_perfctrl1() & MIPS_PERFCTRL_M))
 264                 return 2;
 265         if (!(read_c0_perfctrl2() & MIPS_PERFCTRL_M))
 266                 return 3;
 267
 268         return 4;
 269 }
 270
 271 static inline int n_counters(void)
 272 {
 273         int counters;
 274
 275         switch (current_cpu_type()) {
 276         case CPU_R10000:
 277                 counters = 2;
 278                 break;
 279
 280         case CPU_R12000:
 281         case CPU_R14000:
 282         case CPU_R16000:
 283                 counters = 4;
 284                 break;
 285
 286         default:
 287                 counters = __n_counters();
 288         }
 289
 290         return counters;
 291 }
 292
 293 static void reset_counters(void *arg)
 294 {
 295         int counters = (int)(long)arg;
 296         switch (counters) {
 297         case 4:
 298                 w_c0_perfctrl3(0);
 299                 w_c0_perfcntr3(0);
 300         case 3:
 301                 w_c0_perfctrl2(0);
 302                 w_c0_perfcntr2(0);
 303         case 2:
 304                 w_c0_perfctrl1(0);
 305                 w_c0_perfcntr1(0);
 306         case 1:
 307                 w_c0_perfctrl0(0);
 308                 w_c0_perfcntr0(0);
 309         }
 310 }
 311
 312 static irqreturn_t mipsxx_perfcount_int(int irq, void *dev_id)
 313 {
 314         return mipsxx_perfcount_handler();
 315 }
 316
 317 static int __init mipsxx_init(void)
 318 {
 319         int counters;
 320
 321         counters = n_counters();
 322         if (counters == 0) {
 323                 printk(KERN_ERR "Oprofile: CPU has no performance counters\n");
 324                 return -ENODEV;
 325         }
 326
 327 #ifdef CONFIG_MIPS_MT_SMP
 328         if (!cpu_has_mipsmt_pertccounters)
 329                 counters = counters_total_to_per_cpu(counters);
 330 #endif
 331         on_each_cpu(reset_counters, (void *)(long)counters, 1);
 332
 333         op_model_mipsxx_ops.num_counters = counters;
 334         switch (current_cpu_type()) {
 335         case CPU_M14KC:
 336                 op_model_mipsxx_ops.cpu_type = "mips/M14Kc";
 337                 break;
 338
 339         case CPU_M14KEC:
 340                 op_model_mipsxx_ops.cpu_type = "mips/M14KEc";
 341                 break;
 342
 343         case CPU_20KC:
 344                 op_model_mipsxx_ops.cpu_type = "mips/20K";
 345                 break;
 346
 347         case CPU_24K:
 348                 op_model_mipsxx_ops.cpu_type = "mips/24K";
 349                 break;
 350
 351         case CPU_25KF:
 352                 op_model_mipsxx_ops.cpu_type = "mips/25K";
 353                 break;
 354
 355         case CPU_1004K:
 356         case CPU_34K:
 357                 op_model_mipsxx_ops.cpu_type = "mips/34K";
 358                 break;
 359
 360         case CPU_1074K:
 361         case CPU_74K:
 362                 op_model_mipsxx_ops.cpu_type = "mips/74K";
 363                 break;
 364
 365         case CPU_INTERAPTIV:
 366                 op_model_mipsxx_ops.cpu_type = "mips/interAptiv";
 367                 break;
 368
 369         case CPU_PROAPTIV:
 370                 op_model_mipsxx_ops.cpu_type = "mips/proAptiv";
 371                 break;
 372
 373         case CPU_P5600:
 374                 op_model_mipsxx_ops.cpu_type = "mips/P5600";
 375                 break;
 376
 377         case CPU_I6400:
 378                 op_model_mipsxx_ops.cpu_type = "mips/I6400";
 379                 break;
 380
 381         case CPU_M5150:
 382                 op_model_mipsxx_ops.cpu_type = "mips/M5150";
 383                 break;
 384
 385         case CPU_5KC:
 386                 op_model_mipsxx_ops.cpu_type = "mips/5K";
 387                 break;
 388
 389         case CPU_R10000:
 390                 if ((current_cpu_data.processor_id & 0xff) == 0x20)
 391                         op_model_mipsxx_ops.cpu_type = "mips/r10000-v2.x";
 392                 else
 393                         op_model_mipsxx_ops.cpu_type = "mips/r10000";
 394                 break;
 395
 396         case CPU_R12000:
 397         case CPU_R14000:
 398                 op_model_mipsxx_ops.cpu_type = "mips/r12000";
 399                 break;
 400
 401         case CPU_R16000:
 402                 op_model_mipsxx_ops.cpu_type = "mips/r16000";
 403                 break;
 404
 405         case CPU_SB1:
 406         case CPU_SB1A:
 407                 op_model_mipsxx_ops.cpu_type = "mips/sb1";
 408                 break;
 409
 410         case CPU_LOONGSON1:
 411                 op_model_mipsxx_ops.cpu_type = "mips/loongson1";
 412                 break;
 413
 414         case CPU_XLR:
 415                 op_model_mipsxx_ops.cpu_type = "mips/xlr";
 416                 break;
 417
 418         default:
 419                 printk(KERN_ERR "Profiling unsupported for this CPU\n");
 420
 421                 return -ENODEV;
 422         }
 423
 424         save_perf_irq = perf_irq;
 425         perf_irq = mipsxx_perfcount_handler;
 426
 427         if (get_c0_perfcount_int)
 428                 perfcount_irq = get_c0_perfcount_int();
 429         else if (cp0_perfcount_irq >= 0)
 430                 perfcount_irq = MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
 431         else
 432                 perfcount_irq = -1;
 433
 434         if (perfcount_irq >= 0)
 435                 return request_irq(perfcount_irq, mipsxx_perfcount_int,
 436                                    IRQF_PERCPU | IRQF_NOBALANCING |
 437                                    IRQF_NO_THREAD | IRQF_NO_SUSPEND |
 438                                    IRQF_SHARED,
 439                                    "Perfcounter", save_perf_irq);
 440
 441         return 0;
 442 }
 443
 444 static void mipsxx_exit(void)
 445 {
 446         int counters = op_model_mipsxx_ops.num_counters;
 447
 448         if (perfcount_irq >= 0)
 449                 free_irq(perfcount_irq, save_perf_irq);
 450
 451         counters = counters_per_cpu_to_total(counters);
 452         on_each_cpu(reset_counters, (void *)(long)counters, 1);
 453
 454         perf_irq = save_perf_irq;
 455 }
 456
 457 struct op_mips_model op_model_mipsxx_ops = {
 458         .reg_setup      = mipsxx_reg_setup,
 459         .cpu_setup      = mipsxx_cpu_setup,
 460         .init           = mipsxx_init,
 461         .exit           = mipsxx_exit,
 462         .cpu_start      = mipsxx_cpu_start,
 463         .cpu_stop       = mipsxx_cpu_stop,
 464 };