arch/m32r/kernel/smpboot.c

   1 /*
   2  *  linux/arch/m32r/kernel/smpboot.c
   3  *    orig : i386 2.4.10
   4  *
   5  *  M32R SMP booting functions
   6  *
   7  *  Copyright (c) 2001, 2002, 2003  Hitoshi Yamamoto
   8  *
   9  *  Taken from i386 version.
  10  *        (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
  11  *        (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
  12  *
  13  *      Much of the core SMP work is based on previous work by Thomas Radke, to
  14  *      whom a great many thanks are extended.
  15  *
  16  *      Thanks to Intel for making available several different Pentium,
  17  *      Pentium Pro and Pentium-II/Xeon MP machines.
  18  *      Original development of Linux SMP code supported by Caldera.
  19  *
  20  *      This code is released under the GNU General Public License version 2 or
  21  *      later.
  22  *
  23  *      Fixes
  24  *              Felix Koop      :       NR_CPUS used properly
  25  *              Jose Renau      :       Handle single CPU case.
  26  *              Alan Cox        :       By repeated request
  27  *                                      8) - Total BogoMIP report.
  28  *              Greg Wright     :       Fix for kernel stacks panic.
  29  *              Erich Boleyn    :       MP v1.4 and additional changes.
  30  *      Matthias Sattler        :       Changes for 2.1 kernel map.
  31  *      Michel Lespinasse       :       Changes for 2.1 kernel map.
  32  *      Michael Chastain        :       Change trampoline.S to gnu as.
  33  *              Alan Cox        :       Dumb bug: 'B' step PPro's are fine
  34  *              Ingo Molnar     :       Added APIC timers, based on code
  35  *                                      from Jose Renau
  36  *              Ingo Molnar     :       various cleanups and rewrites
  37  *              Tigran Aivazian :       fixed "0.00 in /proc/uptime on SMP" bug.
  38  *      Maciej W. Rozycki       :       Bits for genuine 82489DX APICs
  39  *              Martin J. Bligh :       Added support for multi-quad systems
  40  */
  41
  42 #include <linux/module.h>
  43 #include <linux/cpu.h>
  44 #include <linux/init.h>
  45 #include <linux/kernel.h>
  46 #include <linux/mm.h>
  47 #include <linux/sched.h>
  48 #include <linux/sched/task.h>
  49 #include <linux/err.h>
  50 #include <linux/irq.h>
  51 #include <linux/bootmem.h>
  52 #include <linux/delay.h>
  53
  54 #include <asm/io.h>
  55 #include <asm/pgalloc.h>
  56 #include <asm/tlbflush.h>
  57
  58 #define DEBUG_SMP
  59 #ifdef DEBUG_SMP
  60 #define Dprintk(x...) printk(x)
  61 #else
  62 #define Dprintk(x...)
  63 #endif
  64
  65 extern cpumask_t cpu_initialized;
  66
  67 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  68 /* Data structures and variables                                             */
  69 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  70
  71 /* Processor that is doing the boot up */
  72 static unsigned int bsp_phys_id = -1;
  73
  74 /* Bitmask of physically existing CPUs */
  75 physid_mask_t phys_cpu_present_map;
  76
  77 cpumask_t cpu_bootout_map;
  78 cpumask_t cpu_bootin_map;
  79 static cpumask_t cpu_callin_map;
  80 cpumask_t cpu_callout_map;
  81 EXPORT_SYMBOL(cpu_callout_map);
  82
  83 /* Per CPU bogomips and other parameters */
  84 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
  85
  86 static int cpucount;
  87 static cpumask_t smp_commenced_mask;
  88
  89 extern struct {
  90         void * spi;
  91         unsigned short ss;
  92 } stack_start;
  93
  94 /* which physical physical ID maps to which logical CPU number */
  95 static volatile int physid_2_cpu[NR_CPUS];
  96 #define physid_to_cpu(physid)   physid_2_cpu[physid]
  97
  98 /* which logical CPU number maps to which physical ID */
  99 volatile int cpu_2_physid[NR_CPUS];
 100
 101 DEFINE_PER_CPU(int, prof_multiplier) = 1;
 102 DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
 103 DEFINE_PER_CPU(int, prof_counter) = 1;
 104
 105 spinlock_t ipi_lock[NR_IPIS];
 106
 107 static unsigned int calibration_result;
 108
 109 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 110 /* Function Prototypes                                                       */
 111 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 112
 113 static void init_ipi_lock(void);
 114 static void do_boot_cpu(int);
 115
 116 int start_secondary(void *);
 117 static void smp_callin(void);
 118 static void smp_online(void);
 119
 120 static void show_mp_info(int);
 121 static void smp_store_cpu_info(int);
 122 static void show_cpu_info(int);
 123 int setup_profiling_timer(unsigned int);
 124 static void init_cpu_to_physid(void);
 125 static void map_cpu_to_physid(int, int);
 126 static void unmap_cpu_to_physid(int, int);
 127
 128 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 129 /* Boot up APs Routines : BSP                                                */
 130 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 131 void smp_prepare_boot_cpu(void)
 132 {
 133         bsp_phys_id = hard_smp_processor_id();
 134         physid_set(bsp_phys_id, phys_cpu_present_map);
 135         set_cpu_online(0, true);        /* BSP's cpu_id == 0 */
 136         cpumask_set_cpu(0, &cpu_callout_map);
 137         cpumask_set_cpu(0, &cpu_callin_map);
 138
 139         /*
 140          * Initialize the logical to physical CPU number mapping
 141          */
 142         init_cpu_to_physid();
 143         map_cpu_to_physid(0, bsp_phys_id);
 144         current_thread_info()->cpu = 0;
 145 }
 146
 147 /*==========================================================================*
 148  * Name:         smp_prepare_cpus (old smp_boot_cpus)
 149  *
 150  * Description:  This routine boot up APs.
 151  *
 152  * Born on Date: 2002.02.05
 153  *
 154  * Arguments:    NONE
 155  *
 156  * Returns:      void (cannot fail)
 157  *
 158  * Modification log:
 159  * Date       Who Description
 160  * ---------- --- --------------------------------------------------------
 161  * 2003-06-24 hy  modify for linux-2.5.69
 162  *
 163  *==========================================================================*/
 164 void __init smp_prepare_cpus(unsigned int max_cpus)
 165 {
 166         int phys_id;
 167         unsigned long nr_cpu;
 168
 169         nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
 170         if (nr_cpu > NR_CPUS) {
 171                 printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
 172                         nr_cpu, NR_CPUS);
 173                 goto smp_done;
 174         }
 175         for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
 176                 physid_set(phys_id, phys_cpu_present_map);
 177 #ifndef CONFIG_HOTPLUG_CPU
 178         init_cpu_present(cpu_possible_mask);
 179 #endif
 180
 181         show_mp_info(nr_cpu);
 182
 183         init_ipi_lock();
 184
 185         /*
 186          * Setup boot CPU information
 187          */
 188         smp_store_cpu_info(0); /* Final full version of the data */
 189
 190         /*
 191          * If SMP should be disabled, then really disable it!
 192          */
 193         if (!max_cpus) {
 194                 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
 195                 goto smp_done;
 196         }
 197
 198         /*
 199          * Now scan the CPU present map and fire up the other CPUs.
 200          */
 201         Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
 202
 203         for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
 204                 /*
 205                  * Don't even attempt to start the boot CPU!
 206                  */
 207                 if (phys_id == bsp_phys_id)
 208                         continue;
 209
 210                 if (!physid_isset(phys_id, phys_cpu_present_map))
 211                         continue;
 212
 213                 if (max_cpus <= cpucount + 1)
 214                         continue;
 215
 216                 do_boot_cpu(phys_id);
 217
 218                 /*
 219                  * Make sure we unmap all failed CPUs
 220                  */
 221                 if (physid_to_cpu(phys_id) == -1) {
 222                         physid_clear(phys_id, phys_cpu_present_map);
 223                         printk("phys CPU#%d not responding - " \
 224                                 "cannot use it.\n", phys_id);
 225                 }
 226         }
 227
 228 smp_done:
 229         Dprintk("Boot done.\n");
 230 }
 231
 232 /*
 233  * init_ipi_lock : Initialize IPI locks.
 234  */
 235 static void __init init_ipi_lock(void)
 236 {
 237         int ipi;
 238
 239         for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
 240                 spin_lock_init(&ipi_lock[ipi]);
 241 }
 242
 243 /*==========================================================================*
 244  * Name:         do_boot_cpu
 245  *
 246  * Description:  This routine boot up one AP.
 247  *
 248  * Born on Date: 2002.02.05
 249  *
 250  * Arguments:    phys_id - Target CPU physical ID
 251  *
 252  * Returns:      void (cannot fail)
 253  *
 254  * Modification log:
 255  * Date       Who Description
 256  * ---------- --- --------------------------------------------------------
 257  * 2003-06-24 hy  modify for linux-2.5.69
 258  *
 259  *==========================================================================*/
 260 static void __init do_boot_cpu(int phys_id)
 261 {
 262         struct task_struct *idle;
 263         unsigned long send_status, boot_status;
 264         int timeout, cpu_id;
 265
 266         cpu_id = ++cpucount;
 267
 268         /*
 269          * We can't use kernel_thread since we must avoid to
 270          * reschedule the child.
 271          */
 272         idle = fork_idle(cpu_id);
 273         if (IS_ERR(idle))
 274                 panic("failed fork for CPU#%d.", cpu_id);
 275
 276         idle->thread.lr = (unsigned long)start_secondary;
 277
 278         map_cpu_to_physid(cpu_id, phys_id);
 279
 280         /* So we see what's up   */
 281         printk("Booting processor %d/%d\n", phys_id, cpu_id);
 282         stack_start.spi = (void *)idle->thread.sp;
 283         task_thread_info(idle)->cpu = cpu_id;
 284
 285         /*
 286          * Send Startup IPI
 287          *   1.IPI received by CPU#(phys_id).
 288          *   2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
 289          *   3.CPU#(phys_id) enter start_secondary()
 290          */
 291         send_status = 0;
 292         boot_status = 0;
 293
 294         cpumask_set_cpu(phys_id, &cpu_bootout_map);
 295
 296         /* Send Startup IPI */
 297         send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
 298
 299         Dprintk("Waiting for send to finish...\n");
 300         timeout = 0;
 301
 302         /* Wait 100[ms] */
 303         do {
 304                 Dprintk("+");
 305                 udelay(1000);
 306                 send_status = !cpumask_test_cpu(phys_id, &cpu_bootin_map);
 307         } while (send_status && (timeout++ < 100));
 308
 309         Dprintk("After Startup.\n");
 310
 311         if (!send_status) {
 312                 /*
 313                  * allow APs to start initializing.
 314                  */
 315                 Dprintk("Before Callout %d.\n", cpu_id);
 316                 cpumask_set_cpu(cpu_id, &cpu_callout_map);
 317                 Dprintk("After Callout %d.\n", cpu_id);
 318
 319                 /*
 320                  * Wait 5s total for a response
 321                  */
 322                 for (timeout = 0; timeout < 5000; timeout++) {
 323                         if (cpumask_test_cpu(cpu_id, &cpu_callin_map))
 324                                 break;  /* It has booted */
 325                         udelay(1000);
 326                 }
 327
 328                 if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
 329                         /* number CPUs logically, starting from 1 (BSP is 0) */
 330                         Dprintk("OK.\n");
 331                 } else {
 332                         boot_status = 1;
 333                         printk("Not responding.\n");
 334                 }
 335         } else
 336                 printk("IPI never delivered???\n");
 337
 338         if (send_status || boot_status) {
 339                 unmap_cpu_to_physid(cpu_id, phys_id);
 340                 cpumask_clear_cpu(cpu_id, &cpu_callout_map);
 341                 cpumask_clear_cpu(cpu_id, &cpu_callin_map);
 342                 cpumask_clear_cpu(cpu_id, &cpu_initialized);
 343                 cpucount--;
 344         }
 345 }
 346
 347 int __cpu_up(unsigned int cpu_id, struct task_struct *tidle)
 348 {
 349         int timeout;
 350
 351         cpumask_set_cpu(cpu_id, &smp_commenced_mask);
 352
 353         /*
 354          * Wait 5s total for a response
 355          */
 356         for (timeout = 0; timeout < 5000; timeout++) {
 357                 if (cpu_online(cpu_id))
 358                         break;
 359                 udelay(1000);
 360         }
 361         if (!cpu_online(cpu_id))
 362                 BUG();
 363
 364         return 0;
 365 }
 366
 367 void __init smp_cpus_done(unsigned int max_cpus)
 368 {
 369         int cpu_id, timeout;
 370         unsigned long bogosum = 0;
 371
 372         for (timeout = 0; timeout < 5000; timeout++) {
 373                 if (cpumask_equal(&cpu_callin_map, cpu_online_mask))
 374                         break;
 375                 udelay(1000);
 376         }
 377         if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
 378                 BUG();
 379
 380         for_each_online_cpu(cpu_id)
 381                 show_cpu_info(cpu_id);
 382
 383         /*
 384          * Allow the user to impress friends.
 385          */
 386         Dprintk("Before bogomips.\n");
 387         if (cpucount) {
 388                 for_each_cpu(cpu_id,cpu_online_mask)
 389                         bogosum += cpu_data[cpu_id].loops_per_jiffy;
 390
 391                 printk(KERN_INFO "Total of %d processors activated " \
 392                         "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
 393                         bogosum / (500000 / HZ),
 394                         (bogosum / (5000 / HZ)) % 100);
 395                 Dprintk("Before bogocount - setting activated=1.\n");
 396         }
 397 }
 398
 399 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 400 /* Activate a secondary processor Routines                                   */
 401 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 402
 403 /*==========================================================================*
 404  * Name:         start_secondary
 405  *
 406  * Description:  This routine activate a secondary processor.
 407  *
 408  * Born on Date: 2002.02.05
 409  *
 410  * Arguments:    *unused - currently unused.
 411  *
 412  * Returns:      void (cannot fail)
 413  *
 414  * Modification log:
 415  * Date       Who Description
 416  * ---------- --- --------------------------------------------------------
 417  * 2003-06-24 hy  modify for linux-2.5.69
 418  *
 419  *==========================================================================*/
 420 int __init start_secondary(void *unused)
 421 {
 422         cpu_init();
 423         preempt_disable();
 424         smp_callin();
 425         while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
 426                 cpu_relax();
 427
 428         smp_online();
 429
 430         /*
 431          * low-memory mappings have been cleared, flush them from
 432          * the local TLBs too.
 433          */
 434         local_flush_tlb_all();
 435
 436         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 437         return 0;
 438 }
 439
 440 /*==========================================================================*
 441  * Name:         smp_callin
 442  *
 443  * Description:  This routine activate a secondary processor.
 444  *
 445  * Born on Date: 2002.02.05
 446  *
 447  * Arguments:    NONE
 448  *
 449  * Returns:      void (cannot fail)
 450  *
 451  * Modification log:
 452  * Date       Who Description
 453  * ---------- --- --------------------------------------------------------
 454  * 2003-06-24 hy  modify for linux-2.5.69
 455  *
 456  *==========================================================================*/
 457 static void __init smp_callin(void)
 458 {
 459         int phys_id = hard_smp_processor_id();
 460         int cpu_id = smp_processor_id();
 461         unsigned long timeout;
 462
 463         if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
 464                 printk("huh, phys CPU#%d, CPU#%d already present??\n",
 465                         phys_id, cpu_id);
 466                 BUG();
 467         }
 468         Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
 469
 470         /* Waiting 2s total for startup (udelay is not yet working) */
 471         timeout = jiffies + (2 * HZ);
 472         while (time_before(jiffies, timeout)) {
 473                 /* Has the boot CPU finished it's STARTUP sequence ? */
 474                 if (cpumask_test_cpu(cpu_id, &cpu_callout_map))
 475                         break;
 476                 cpu_relax();
 477         }
 478
 479         if (!time_before(jiffies, timeout)) {
 480                 printk("BUG: CPU#%d started up but did not get a callout!\n",
 481                         cpu_id);
 482                 BUG();
 483         }
 484
 485         /* Allow the master to continue. */
 486         cpumask_set_cpu(cpu_id, &cpu_callin_map);
 487 }
 488
 489 static void __init smp_online(void)
 490 {
 491         int cpu_id = smp_processor_id();
 492
 493         notify_cpu_starting(cpu_id);
 494
 495         local_irq_enable();
 496
 497         /* Get our bogomips. */
 498         calibrate_delay();
 499
 500         /* Save our processor parameters */
 501         smp_store_cpu_info(cpu_id);
 502
 503         set_cpu_online(cpu_id, true);
 504 }
 505
 506 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 507 /* Boot up CPUs common Routines                                              */
 508 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 509 static void __init show_mp_info(int nr_cpu)
 510 {
 511         int i;
 512         char cpu_model0[17], cpu_model1[17], cpu_ver[9];
 513
 514         strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
 515         strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
 516         strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
 517
 518         cpu_model0[16] = '\0';
 519         for (i = 15 ; i >= 0 ; i--) {
 520                 if (cpu_model0[i] != ' ')
 521                         break;
 522                 cpu_model0[i] = '\0';
 523         }
 524         cpu_model1[16] = '\0';
 525         for (i = 15 ; i >= 0 ; i--) {
 526                 if (cpu_model1[i] != ' ')
 527                         break;
 528                 cpu_model1[i] = '\0';
 529         }
 530         cpu_ver[8] = '\0';
 531         for (i = 7 ; i >= 0 ; i--) {
 532                 if (cpu_ver[i] != ' ')
 533                         break;
 534                 cpu_ver[i] = '\0';
 535         }
 536
 537         printk(KERN_INFO "M32R-mp information\n");
 538         printk(KERN_INFO "  On-chip CPUs : %d\n", nr_cpu);
 539         printk(KERN_INFO "  CPU model : %s/%s(%s)\n", cpu_model0,
 540                 cpu_model1, cpu_ver);
 541 }
 542
 543 /*
 544  * The bootstrap kernel entry code has set these up. Save them for
 545  * a given CPU
 546  */
 547 static void __init smp_store_cpu_info(int cpu_id)
 548 {
 549         struct cpuinfo_m32r *ci = cpu_data + cpu_id;
 550
 551         *ci = boot_cpu_data;
 552         ci->loops_per_jiffy = loops_per_jiffy;
 553 }
 554
 555 static void __init show_cpu_info(int cpu_id)
 556 {
 557         struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
 558
 559         printk("CPU#%d : ", cpu_id);
 560
 561 #define PRINT_CLOCK(name, value) \
 562         printk(name " clock %d.%02dMHz", \
 563                 ((value) / 1000000), ((value) % 1000000) / 10000)
 564
 565         PRINT_CLOCK("CPU", (int)ci->cpu_clock);
 566         PRINT_CLOCK(", Bus", (int)ci->bus_clock);
 567         printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
 568 }
 569
 570 /*
 571  * the frequency of the profiling timer can be changed
 572  * by writing a multiplier value into /proc/profile.
 573  */
 574 int setup_profiling_timer(unsigned int multiplier)
 575 {
 576         int i;
 577
 578         /*
 579          * Sanity check. [at least 500 APIC cycles should be
 580          * between APIC interrupts as a rule of thumb, to avoid
 581          * irqs flooding us]
 582          */
 583         if ( (!multiplier) || (calibration_result / multiplier < 500))
 584                 return -EINVAL;
 585
 586         /*
 587          * Set the new multiplier for each CPU. CPUs don't start using the
 588          * new values until the next timer interrupt in which they do process
 589          * accounting. At that time they also adjust their APIC timers
 590          * accordingly.
 591          */
 592         for_each_possible_cpu(i)
 593                 per_cpu(prof_multiplier, i) = multiplier;
 594
 595         return 0;
 596 }
 597
 598 /* Initialize all maps between cpu number and apicids */
 599 static void __init init_cpu_to_physid(void)
 600 {
 601         int  i;
 602
 603         for (i = 0 ; i < NR_CPUS ; i++) {
 604                 cpu_2_physid[i] = -1;
 605                 physid_2_cpu[i] = -1;
 606         }
 607 }
 608
 609 /*
 610  * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
 611  * else physical apic ids
 612  */
 613 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
 614 {
 615         physid_2_cpu[phys_id] = cpu_id;
 616         cpu_2_physid[cpu_id] = phys_id;
 617 }
 618
 619 /*
 620  * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
 621  * else physical apic ids
 622  */
 623 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
 624 {
 625         physid_2_cpu[phys_id] = -1;
 626         cpu_2_physid[cpu_id] = -1;
 627 }