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 static int cpu_has_mipsmt_pertccounters;
  40 #define WHAT            (MIPS_PERFCTRL_MT_EN_VPE | \
  41                          M_PERFCTL_VPEID(cpu_data[smp_processor_id()].vpe_id))
  42 #define vpe_id()        (cpu_has_mipsmt_pertccounters ? \
  43                         0 : cpu_data[smp_processor_id()].vpe_id)
  44
  45 /*
  46  * The number of bits to shift to convert between counters per core and
  47  * counters per VPE.  There is no reasonable interface atm to obtain the
  48  * number of VPEs used by Linux and in the 34K this number is fixed to two
  49  * anyways so we hardcore a few things here for the moment.  The way it's
  50  * done here will ensure that oprofile VSMP kernel will run right on a lesser
  51  * core like a 24K also or with maxcpus=1.
  52  */
  53 static inline unsigned int vpe_shift(void)
  54 {
  55         if (num_possible_cpus() > 1)
  56                 return 1;
  57
  58         return 0;
  59 }
  60
  61 #else
  62
  63 #define WHAT            0
  64 #define vpe_id()        0
  65
  66 static inline unsigned int vpe_shift(void)
  67 {
  68         return 0;
  69 }
  70
  71 #endif
  72
  73 static inline unsigned int counters_total_to_per_cpu(unsigned int counters)
  74 {
  75         return counters >> vpe_shift();
  76 }
  77
  78 static inline unsigned int counters_per_cpu_to_total(unsigned int counters)
  79 {
  80         return counters << vpe_shift();
  81 }
  82
  83 #define __define_perf_accessors(r, n, np)                               \
  84                                                                         \
  85 static inline unsigned int r_c0_ ## r ## n(void)                        \
  86 {                                                                       \
  87         unsigned int cpu = vpe_id();                                    \
  88                                                                         \
  89         switch (cpu) {                                                  \
  90         case 0:                                                         \
  91                 return read_c0_ ## r ## n();                            \
  92         case 1:                                                         \
  93                 return read_c0_ ## r ## np();                           \
  94         default:                                                        \
  95                 BUG();                                                  \
  96         }                                                               \
  97         return 0;                                                       \
  98 }                                                                       \
  99                                                                         \
 100 static inline void w_c0_ ## r ## n(unsigned int value)                  \
 101 {                                                                       \
 102         unsigned int cpu = vpe_id();                                    \
 103                                                                         \
 104         switch (cpu) {                                                  \
 105         case 0:                                                         \
 106                 write_c0_ ## r ## n(value);                             \
 107                 return;                                                 \
 108         case 1:                                                         \
 109                 write_c0_ ## r ## np(value);                            \
 110                 return;                                                 \
 111         default:                                                        \
 112                 BUG();                                                  \
 113         }                                                               \
 114         return;                                                         \
 115 }                                                                       \
 116
 117 __define_perf_accessors(perfcntr, 0, 2)
 118 __define_perf_accessors(perfcntr, 1, 3)
 119 __define_perf_accessors(perfcntr, 2, 0)
 120 __define_perf_accessors(perfcntr, 3, 1)
 121
 122 __define_perf_accessors(perfctrl, 0, 2)
 123 __define_perf_accessors(perfctrl, 1, 3)
 124 __define_perf_accessors(perfctrl, 2, 0)
 125 __define_perf_accessors(perfctrl, 3, 1)
 126
 127 struct op_mips_model op_model_mipsxx_ops;
 128
 129 static struct mipsxx_register_config {
 130         unsigned int control[4];
 131         unsigned int counter[4];
 132 } reg;
 133
 134 /* Compute all of the registers in preparation for enabling profiling.  */
 135
 136 static void mipsxx_reg_setup(struct op_counter_config *ctr)
 137 {
 138         unsigned int counters = op_model_mipsxx_ops.num_counters;
 139         int i;
 140
 141         /* Compute the performance counter control word.  */
 142         for (i = 0; i < counters; i++) {
 143                 reg.control[i] = 0;
 144                 reg.counter[i] = 0;
 145
 146                 if (!ctr[i].enabled)
 147                         continue;
 148
 149                 reg.control[i] = M_PERFCTL_EVENT(ctr[i].event) |
 150                                  MIPS_PERFCTRL_IE;
 151                 if (ctr[i].kernel)
 152                         reg.control[i] |= MIPS_PERFCTRL_K;
 153                 if (ctr[i].user)
 154                         reg.control[i] |= MIPS_PERFCTRL_U;
 155                 if (ctr[i].exl)
 156                         reg.control[i] |= MIPS_PERFCTRL_EXL;
 157                 if (boot_cpu_type() == CPU_XLR)
 158                         reg.control[i] |= XLR_PERFCTRL_ALLTHREADS;
 159                 reg.counter[i] = 0x80000000 - ctr[i].count;
 160         }
 161 }
 162
 163 /* Program all of the registers in preparation for enabling profiling.  */
 164
 165 static void mipsxx_cpu_setup(void *args)
 166 {
 167         unsigned int counters = op_model_mipsxx_ops.num_counters;
 168
 169         if (oprofile_skip_cpu(smp_processor_id()))
 170                 return;
 171
 172         switch (counters) {
 173         case 4:
 174                 w_c0_perfctrl3(0);
 175                 w_c0_perfcntr3(reg.counter[3]);
 176         case 3:
 177                 w_c0_perfctrl2(0);
 178                 w_c0_perfcntr2(reg.counter[2]);
 179         case 2:
 180                 w_c0_perfctrl1(0);
 181                 w_c0_perfcntr1(reg.counter[1]);
 182         case 1:
 183                 w_c0_perfctrl0(0);
 184                 w_c0_perfcntr0(reg.counter[0]);
 185         }
 186 }
 187
 188 /* Start all counters on current CPU */
 189 static void mipsxx_cpu_start(void *args)
 190 {
 191         unsigned int counters = op_model_mipsxx_ops.num_counters;
 192
 193         if (oprofile_skip_cpu(smp_processor_id()))
 194                 return;
 195
 196         switch (counters) {
 197         case 4:
 198                 w_c0_perfctrl3(WHAT | reg.control[3]);
 199         case 3:
 200                 w_c0_perfctrl2(WHAT | reg.control[2]);
 201         case 2:
 202                 w_c0_perfctrl1(WHAT | reg.control[1]);
 203         case 1:
 204                 w_c0_perfctrl0(WHAT | reg.control[0]);
 205         }
 206 }
 207
 208 /* Stop all counters on current CPU */
 209 static void mipsxx_cpu_stop(void *args)
 210 {
 211         unsigned int counters = op_model_mipsxx_ops.num_counters;
 212
 213         if (oprofile_skip_cpu(smp_processor_id()))
 214                 return;
 215
 216         switch (counters) {
 217         case 4:
 218                 w_c0_perfctrl3(0);
 219         case 3:
 220                 w_c0_perfctrl2(0);
 221         case 2:
 222                 w_c0_perfctrl1(0);
 223         case 1:
 224                 w_c0_perfctrl0(0);
 225         }
 226 }
 227
 228 static int mipsxx_perfcount_handler(void)
 229 {
 230         unsigned int counters = op_model_mipsxx_ops.num_counters;
 231         unsigned int control;
 232         unsigned int counter;
 233         int handled = IRQ_NONE;
 234
 235         if (cpu_has_mips_r2 && !(read_c0_cause() & CAUSEF_PCI))
 236                 return handled;
 237
 238         switch (counters) {
 239 #define HANDLE_COUNTER(n)                                               \
 240         case n + 1:                                                     \
 241                 control = r_c0_perfctrl ## n();                         \
 242                 counter = r_c0_perfcntr ## n();                         \
 243                 if ((control & MIPS_PERFCTRL_IE) &&                     \
 244                     (counter & M_COUNTER_OVERFLOW)) {                   \
 245                         oprofile_add_sample(get_irq_regs(), n);         \
 246                         w_c0_perfcntr ## n(reg.counter[n]);             \
 247                         handled = IRQ_HANDLED;                          \
 248                 }
 249         HANDLE_COUNTER(3)
 250         HANDLE_COUNTER(2)
 251         HANDLE_COUNTER(1)
 252         HANDLE_COUNTER(0)
 253         }
 254
 255         return handled;
 256 }
 257
 258 static inline int __n_counters(void)
 259 {
 260         if (!cpu_has_perf)
 261                 return 0;
 262         if (!(read_c0_perfctrl0() & MIPS_PERFCTRL_M))
 263                 return 1;
 264         if (!(read_c0_perfctrl1() & MIPS_PERFCTRL_M))
 265                 return 2;
 266         if (!(read_c0_perfctrl2() & MIPS_PERFCTRL_M))
 267                 return 3;
 268
 269         return 4;
 270 }
 271
 272 static inline int n_counters(void)
 273 {
 274         int counters;
 275
 276         switch (current_cpu_type()) {
 277         case CPU_R10000:
 278                 counters = 2;
 279                 break;
 280
 281         case CPU_R12000:
 282         case CPU_R14000:
 283         case CPU_R16000:
 284                 counters = 4;
 285                 break;
 286
 287         default:
 288                 counters = __n_counters();
 289         }
 290
 291         return counters;
 292 }
 293
 294 static void reset_counters(void *arg)
 295 {
 296         int counters = (int)(long)arg;
 297         switch (counters) {
 298         case 4:
 299                 w_c0_perfctrl3(0);
 300                 w_c0_perfcntr3(0);
 301         case 3:
 302                 w_c0_perfctrl2(0);
 303                 w_c0_perfcntr2(0);
 304         case 2:
 305                 w_c0_perfctrl1(0);
 306                 w_c0_perfcntr1(0);
 307         case 1:
 308                 w_c0_perfctrl0(0);
 309                 w_c0_perfcntr0(0);
 310         }
 311 }
 312
 313 static irqreturn_t mipsxx_perfcount_int(int irq, void *dev_id)
 314 {
 315         return mipsxx_perfcount_handler();
 316 }
 317
 318 static int __init mipsxx_init(void)
 319 {
 320         int counters;
 321
 322         counters = n_counters();
 323         if (counters == 0) {
 324                 printk(KERN_ERR "Oprofile: CPU has no performance counters\n");
 325                 return -ENODEV;
 326         }
 327
 328 #ifdef CONFIG_MIPS_MT_SMP
 329         cpu_has_mipsmt_pertccounters = read_c0_config7() & (1<<19);
 330         if (!cpu_has_mipsmt_pertccounters)
 331                 counters = counters_total_to_per_cpu(counters);
 332 #endif
 333         on_each_cpu(reset_counters, (void *)(long)counters, 1);
 334
 335         op_model_mipsxx_ops.num_counters = counters;
 336         switch (current_cpu_type()) {
 337         case CPU_M14KC:
 338                 op_model_mipsxx_ops.cpu_type = "mips/M14Kc";
 339                 break;
 340
 341         case CPU_M14KEC:
 342                 op_model_mipsxx_ops.cpu_type = "mips/M14KEc";
 343                 break;
 344
 345         case CPU_20KC:
 346                 op_model_mipsxx_ops.cpu_type = "mips/20K";
 347                 break;
 348
 349         case CPU_24K:
 350                 op_model_mipsxx_ops.cpu_type = "mips/24K";
 351                 break;
 352
 353         case CPU_25KF:
 354                 op_model_mipsxx_ops.cpu_type = "mips/25K";
 355                 break;
 356
 357         case CPU_1004K:
 358         case CPU_34K:
 359                 op_model_mipsxx_ops.cpu_type = "mips/34K";
 360                 break;
 361
 362         case CPU_1074K:
 363         case CPU_74K:
 364                 op_model_mipsxx_ops.cpu_type = "mips/74K";
 365                 break;
 366
 367         case CPU_INTERAPTIV:
 368                 op_model_mipsxx_ops.cpu_type = "mips/interAptiv";
 369                 break;
 370
 371         case CPU_PROAPTIV:
 372                 op_model_mipsxx_ops.cpu_type = "mips/proAptiv";
 373                 break;
 374
 375         case CPU_P5600:
 376                 op_model_mipsxx_ops.cpu_type = "mips/P5600";
 377                 break;
 378
 379         case CPU_I6400:
 380                 op_model_mipsxx_ops.cpu_type = "mips/I6400";
 381                 break;
 382
 383         case CPU_M5150:
 384                 op_model_mipsxx_ops.cpu_type = "mips/M5150";
 385                 break;
 386
 387         case CPU_5KC:
 388                 op_model_mipsxx_ops.cpu_type = "mips/5K";
 389                 break;
 390
 391         case CPU_R10000:
 392                 if ((current_cpu_data.processor_id & 0xff) == 0x20)
 393                         op_model_mipsxx_ops.cpu_type = "mips/r10000-v2.x";
 394                 else
 395                         op_model_mipsxx_ops.cpu_type = "mips/r10000";
 396                 break;
 397
 398         case CPU_R12000:
 399         case CPU_R14000:
 400                 op_model_mipsxx_ops.cpu_type = "mips/r12000";
 401                 break;
 402
 403         case CPU_R16000:
 404                 op_model_mipsxx_ops.cpu_type = "mips/r16000";
 405                 break;
 406
 407         case CPU_SB1:
 408         case CPU_SB1A:
 409                 op_model_mipsxx_ops.cpu_type = "mips/sb1";
 410                 break;
 411
 412         case CPU_LOONGSON1:
 413                 op_model_mipsxx_ops.cpu_type = "mips/loongson1";
 414                 break;
 415
 416         case CPU_XLR:
 417                 op_model_mipsxx_ops.cpu_type = "mips/xlr";
 418                 break;
 419
 420         default:
 421                 printk(KERN_ERR "Profiling unsupported for this CPU\n");
 422
 423                 return -ENODEV;
 424         }
 425
 426         save_perf_irq = perf_irq;
 427         perf_irq = mipsxx_perfcount_handler;
 428
 429         if (get_c0_perfcount_int)
 430                 perfcount_irq = get_c0_perfcount_int();
 431         else if (cp0_perfcount_irq >= 0)
 432                 perfcount_irq = MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
 433         else
 434                 perfcount_irq = -1;
 435
 436         if (perfcount_irq >= 0)
 437                 return request_irq(perfcount_irq, mipsxx_perfcount_int,
 438                                    IRQF_PERCPU | IRQF_NOBALANCING |
 439                                    IRQF_NO_THREAD | IRQF_NO_SUSPEND |
 440                                    IRQF_SHARED,
 441                                    "Perfcounter", save_perf_irq);
 442
 443         return 0;
 444 }
 445
 446 static void mipsxx_exit(void)
 447 {
 448         int counters = op_model_mipsxx_ops.num_counters;
 449
 450         if (perfcount_irq >= 0)
 451                 free_irq(perfcount_irq, save_perf_irq);
 452
 453         counters = counters_per_cpu_to_total(counters);
 454         on_each_cpu(reset_counters, (void *)(long)counters, 1);
 455
 456         perf_irq = save_perf_irq;
 457 }
 458
 459 struct op_mips_model op_model_mipsxx_ops = {
 460         .reg_setup      = mipsxx_reg_setup,
 461         .cpu_setup      = mipsxx_cpu_setup,
 462         .init           = mipsxx_init,
 463         .exit           = mipsxx_exit,
 464         .cpu_start      = mipsxx_cpu_start,
 465         .cpu_stop       = mipsxx_cpu_stop,
 466 };