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/err.h>
  49 #include <linux/irq.h>
  50 #include <linux/bootmem.h>
  51 #include <linux/delay.h>
  52
  53 #include <asm/io.h>
  54 #include <asm/pgalloc.h>
  55 #include <asm/tlbflush.h>
  56
  57 #define DEBUG_SMP
  58 #ifdef DEBUG_SMP
  59 #define Dprintk(x...) printk(x)
  60 #else
  61 #define Dprintk(x...)
  62 #endif
  63
  64 extern cpumask_t cpu_initialized;
  65
  66 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  67 /* Data structures and variables                                             */
  68 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
  69
  70 /* Processor that is doing the boot up */
  71 static unsigned int bsp_phys_id = -1;
  72
  73 /* Bitmask of physically existing CPUs */
  74 physid_mask_t phys_cpu_present_map;
  75
  76 cpumask_t cpu_bootout_map;
  77 cpumask_t cpu_bootin_map;
  78 static cpumask_t cpu_callin_map;
  79 cpumask_t cpu_callout_map;
  80 EXPORT_SYMBOL(cpu_callout_map);
  81
  82 /* Per CPU bogomips and other parameters */
  83 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;
  84
  85 static int cpucount;
  86 static cpumask_t smp_commenced_mask;
  87
  88 extern struct {
  89         void * spi;
  90         unsigned short ss;
  91 } stack_start;
  92
  93 /* which physical physical ID maps to which logical CPU number */
  94 static volatile int physid_2_cpu[NR_CPUS];
  95 #define physid_to_cpu(physid)   physid_2_cpu[physid]
  96
  97 /* which logical CPU number maps to which physical ID */
  98 volatile int cpu_2_physid[NR_CPUS];
  99
 100 DEFINE_PER_CPU(int, prof_multiplier) = 1;
 101 DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
 102 DEFINE_PER_CPU(int, prof_counter) = 1;
 103
 104 spinlock_t ipi_lock[NR_IPIS];
 105
 106 static unsigned int calibration_result;
 107
 108 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 109 /* Function Prototypes                                                       */
 110 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 111
 112 void smp_prepare_boot_cpu(void);
 113 void smp_prepare_cpus(unsigned int);
 114 static void init_ipi_lock(void);
 115 static void do_boot_cpu(int);
 116 int __cpu_up(unsigned int);
 117 void smp_cpus_done(unsigned int);
 118
 119 int start_secondary(void *);
 120 static void smp_callin(void);
 121 static void smp_online(void);
 122
 123 static void show_mp_info(int);
 124 static void smp_store_cpu_info(int);
 125 static void show_cpu_info(int);
 126 int setup_profiling_timer(unsigned int);
 127 static void init_cpu_to_physid(void);
 128 static void map_cpu_to_physid(int, int);
 129 static void unmap_cpu_to_physid(int, int);
 130
 131 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 132 /* Boot up APs Routines : BSP                                                */
 133 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 134 void __devinit smp_prepare_boot_cpu(void)
 135 {
 136         bsp_phys_id = hard_smp_processor_id();
 137         physid_set(bsp_phys_id, phys_cpu_present_map);
 138         set_cpu_online(0, true);        /* BSP's cpu_id == 0 */
 139         cpumask_set_cpu(0, &cpu_callout_map);
 140         cpumask_set_cpu(0, &cpu_callin_map);
 141
 142         /*
 143          * Initialize the logical to physical CPU number mapping
 144          */
 145         init_cpu_to_physid();
 146         map_cpu_to_physid(0, bsp_phys_id);
 147         current_thread_info()->cpu = 0;
 148 }
 149
 150 /*==========================================================================*
 151  * Name:         smp_prepare_cpus (old smp_boot_cpus)
 152  *
 153  * Description:  This routine boot up APs.
 154  *
 155  * Born on Date: 2002.02.05
 156  *
 157  * Arguments:    NONE
 158  *
 159  * Returns:      void (cannot fail)
 160  *
 161  * Modification log:
 162  * Date       Who Description
 163  * ---------- --- --------------------------------------------------------
 164  * 2003-06-24 hy  modify for linux-2.5.69
 165  *
 166  *==========================================================================*/
 167 void __init smp_prepare_cpus(unsigned int max_cpus)
 168 {
 169         int phys_id;
 170         unsigned long nr_cpu;
 171
 172         nr_cpu = inl(M32R_FPGA_NUM_OF_CPUS_PORTL);
 173         if (nr_cpu > NR_CPUS) {
 174                 printk(KERN_INFO "NUM_OF_CPUS reg. value [%ld] > NR_CPU [%d]",
 175                         nr_cpu, NR_CPUS);
 176                 goto smp_done;
 177         }
 178         for (phys_id = 0 ; phys_id < nr_cpu ; phys_id++)
 179                 physid_set(phys_id, phys_cpu_present_map);
 180 #ifndef CONFIG_HOTPLUG_CPU
 181         init_cpu_present(cpu_possible_mask);
 182 #endif
 183
 184         show_mp_info(nr_cpu);
 185
 186         init_ipi_lock();
 187
 188         /*
 189          * Setup boot CPU information
 190          */
 191         smp_store_cpu_info(0); /* Final full version of the data */
 192
 193         /*
 194          * If SMP should be disabled, then really disable it!
 195          */
 196         if (!max_cpus) {
 197                 printk(KERN_INFO "SMP mode deactivated by commandline.\n");
 198                 goto smp_done;
 199         }
 200
 201         /*
 202          * Now scan the CPU present map and fire up the other CPUs.
 203          */
 204         Dprintk("CPU present map : %lx\n", physids_coerce(phys_cpu_present_map));
 205
 206         for (phys_id = 0 ; phys_id < NR_CPUS ; phys_id++) {
 207                 /*
 208                  * Don't even attempt to start the boot CPU!
 209                  */
 210                 if (phys_id == bsp_phys_id)
 211                         continue;
 212
 213                 if (!physid_isset(phys_id, phys_cpu_present_map))
 214                         continue;
 215
 216                 if (max_cpus <= cpucount + 1)
 217                         continue;
 218
 219                 do_boot_cpu(phys_id);
 220
 221                 /*
 222                  * Make sure we unmap all failed CPUs
 223                  */
 224                 if (physid_to_cpu(phys_id) == -1) {
 225                         physid_clear(phys_id, phys_cpu_present_map);
 226                         printk("phys CPU#%d not responding - " \
 227                                 "cannot use it.\n", phys_id);
 228                 }
 229         }
 230
 231 smp_done:
 232         Dprintk("Boot done.\n");
 233 }
 234
 235 /*
 236  * init_ipi_lock : Initialize IPI locks.
 237  */
 238 static void __init init_ipi_lock(void)
 239 {
 240         int ipi;
 241
 242         for (ipi = 0 ; ipi < NR_IPIS ; ipi++)
 243                 spin_lock_init(&ipi_lock[ipi]);
 244 }
 245
 246 /*==========================================================================*
 247  * Name:         do_boot_cpu
 248  *
 249  * Description:  This routine boot up one AP.
 250  *
 251  * Born on Date: 2002.02.05
 252  *
 253  * Arguments:    phys_id - Target CPU physical ID
 254  *
 255  * Returns:      void (cannot fail)
 256  *
 257  * Modification log:
 258  * Date       Who Description
 259  * ---------- --- --------------------------------------------------------
 260  * 2003-06-24 hy  modify for linux-2.5.69
 261  *
 262  *==========================================================================*/
 263 static void __init do_boot_cpu(int phys_id)
 264 {
 265         struct task_struct *idle;
 266         unsigned long send_status, boot_status;
 267         int timeout, cpu_id;
 268
 269         cpu_id = ++cpucount;
 270
 271         /*
 272          * We can't use kernel_thread since we must avoid to
 273          * reschedule the child.
 274          */
 275         idle = fork_idle(cpu_id);
 276         if (IS_ERR(idle))
 277                 panic("failed fork for CPU#%d.", cpu_id);
 278
 279         idle->thread.lr = (unsigned long)start_secondary;
 280
 281         map_cpu_to_physid(cpu_id, phys_id);
 282
 283         /* So we see what's up   */
 284         printk("Booting processor %d/%d\n", phys_id, cpu_id);
 285         stack_start.spi = (void *)idle->thread.sp;
 286         task_thread_info(idle)->cpu = cpu_id;
 287
 288         /*
 289          * Send Startup IPI
 290          *   1.IPI received by CPU#(phys_id).
 291          *   2.CPU#(phys_id) enter startup_AP (arch/m32r/kernel/head.S)
 292          *   3.CPU#(phys_id) enter start_secondary()
 293          */
 294         send_status = 0;
 295         boot_status = 0;
 296
 297         cpumask_set_cpu(phys_id, &cpu_bootout_map);
 298
 299         /* Send Startup IPI */
 300         send_IPI_mask_phys(cpumask_of(phys_id), CPU_BOOT_IPI, 0);
 301
 302         Dprintk("Waiting for send to finish...\n");
 303         timeout = 0;
 304
 305         /* Wait 100[ms] */
 306         do {
 307                 Dprintk("+");
 308                 udelay(1000);
 309                 send_status = !cpumask_test_cpu(phys_id, &cpu_bootin_map);
 310         } while (send_status && (timeout++ < 100));
 311
 312         Dprintk("After Startup.\n");
 313
 314         if (!send_status) {
 315                 /*
 316                  * allow APs to start initializing.
 317                  */
 318                 Dprintk("Before Callout %d.\n", cpu_id);
 319                 cpumask_set_cpu(cpu_id, &cpu_callout_map);
 320                 Dprintk("After Callout %d.\n", cpu_id);
 321
 322                 /*
 323                  * Wait 5s total for a response
 324                  */
 325                 for (timeout = 0; timeout < 5000; timeout++) {
 326                         if (cpumask_test_cpu(cpu_id, &cpu_callin_map))
 327                                 break;  /* It has booted */
 328                         udelay(1000);
 329                 }
 330
 331                 if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
 332                         /* number CPUs logically, starting from 1 (BSP is 0) */
 333                         Dprintk("OK.\n");
 334                 } else {
 335                         boot_status = 1;
 336                         printk("Not responding.\n");
 337                 }
 338         } else
 339                 printk("IPI never delivered???\n");
 340
 341         if (send_status || boot_status) {
 342                 unmap_cpu_to_physid(cpu_id, phys_id);
 343                 cpumask_clear_cpu(cpu_id, &cpu_callout_map);
 344                 cpumask_clear_cpu(cpu_id, &cpu_callin_map);
 345                 cpumask_clear_cpu(cpu_id, &cpu_initialized);
 346                 cpucount--;
 347         }
 348 }
 349
 350 int __cpuinit __cpu_up(unsigned int cpu_id)
 351 {
 352         int timeout;
 353
 354         cpumask_set_cpu(cpu_id, &smp_commenced_mask);
 355
 356         /*
 357          * Wait 5s total for a response
 358          */
 359         for (timeout = 0; timeout < 5000; timeout++) {
 360                 if (cpu_online(cpu_id))
 361                         break;
 362                 udelay(1000);
 363         }
 364         if (!cpu_online(cpu_id))
 365                 BUG();
 366
 367         return 0;
 368 }
 369
 370 void __init smp_cpus_done(unsigned int max_cpus)
 371 {
 372         int cpu_id, timeout;
 373         unsigned long bogosum = 0;
 374
 375         for (timeout = 0; timeout < 5000; timeout++) {
 376                 if (cpumask_equal(&cpu_callin_map, cpu_online_mask))
 377                         break;
 378                 udelay(1000);
 379         }
 380         if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
 381                 BUG();
 382
 383         for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
 384                 show_cpu_info(cpu_id);
 385
 386         /*
 387          * Allow the user to impress friends.
 388          */
 389         Dprintk("Before bogomips.\n");
 390         if (cpucount) {
 391                 for_each_cpu(cpu_id,cpu_online_mask)
 392                         bogosum += cpu_data[cpu_id].loops_per_jiffy;
 393
 394                 printk(KERN_INFO "Total of %d processors activated " \
 395                         "(%lu.%02lu BogoMIPS).\n", cpucount + 1,
 396                         bogosum / (500000 / HZ),
 397                         (bogosum / (5000 / HZ)) % 100);
 398                 Dprintk("Before bogocount - setting activated=1.\n");
 399         }
 400 }
 401
 402 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 403 /* Activate a secondary processor Routines                                   */
 404 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 405
 406 /*==========================================================================*
 407  * Name:         start_secondary
 408  *
 409  * Description:  This routine activate a secondary processor.
 410  *
 411  * Born on Date: 2002.02.05
 412  *
 413  * Arguments:    *unused - currently unused.
 414  *
 415  * Returns:      void (cannot fail)
 416  *
 417  * Modification log:
 418  * Date       Who Description
 419  * ---------- --- --------------------------------------------------------
 420  * 2003-06-24 hy  modify for linux-2.5.69
 421  *
 422  *==========================================================================*/
 423 int __init start_secondary(void *unused)
 424 {
 425         cpu_init();
 426         preempt_disable();
 427         smp_callin();
 428         while (!cpumask_test_cpu(smp_processor_id(), &smp_commenced_mask))
 429                 cpu_relax();
 430
 431         smp_online();
 432
 433         /*
 434          * low-memory mappings have been cleared, flush them from
 435          * the local TLBs too.
 436          */
 437         local_flush_tlb_all();
 438
 439         cpu_idle();
 440         return 0;
 441 }
 442
 443 /*==========================================================================*
 444  * Name:         smp_callin
 445  *
 446  * Description:  This routine activate a secondary processor.
 447  *
 448  * Born on Date: 2002.02.05
 449  *
 450  * Arguments:    NONE
 451  *
 452  * Returns:      void (cannot fail)
 453  *
 454  * Modification log:
 455  * Date       Who Description
 456  * ---------- --- --------------------------------------------------------
 457  * 2003-06-24 hy  modify for linux-2.5.69
 458  *
 459  *==========================================================================*/
 460 static void __init smp_callin(void)
 461 {
 462         int phys_id = hard_smp_processor_id();
 463         int cpu_id = smp_processor_id();
 464         unsigned long timeout;
 465
 466         if (cpumask_test_cpu(cpu_id, &cpu_callin_map)) {
 467                 printk("huh, phys CPU#%d, CPU#%d already present??\n",
 468                         phys_id, cpu_id);
 469                 BUG();
 470         }
 471         Dprintk("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpu_id, phys_id);
 472
 473         /* Waiting 2s total for startup (udelay is not yet working) */
 474         timeout = jiffies + (2 * HZ);
 475         while (time_before(jiffies, timeout)) {
 476                 /* Has the boot CPU finished it's STARTUP sequence ? */
 477                 if (cpumask_test_cpu(cpu_id, &cpu_callout_map))
 478                         break;
 479                 cpu_relax();
 480         }
 481
 482         if (!time_before(jiffies, timeout)) {
 483                 printk("BUG: CPU#%d started up but did not get a callout!\n",
 484                         cpu_id);
 485                 BUG();
 486         }
 487
 488         /* Allow the master to continue. */
 489         cpumask_set_cpu(cpu_id, &cpu_callin_map);
 490 }
 491
 492 static void __init smp_online(void)
 493 {
 494         int cpu_id = smp_processor_id();
 495
 496         notify_cpu_starting(cpu_id);
 497
 498         local_irq_enable();
 499
 500         /* Get our bogomips. */
 501         calibrate_delay();
 502
 503         /* Save our processor parameters */
 504         smp_store_cpu_info(cpu_id);
 505
 506         set_cpu_online(cpu_id, true);
 507 }
 508
 509 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 510 /* Boot up CPUs common Routines                                              */
 511 /*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*/
 512 static void __init show_mp_info(int nr_cpu)
 513 {
 514         int i;
 515         char cpu_model0[17], cpu_model1[17], cpu_ver[9];
 516
 517         strncpy(cpu_model0, (char *)M32R_FPGA_CPU_NAME_ADDR, 16);
 518         strncpy(cpu_model1, (char *)M32R_FPGA_MODEL_ID_ADDR, 16);
 519         strncpy(cpu_ver, (char *)M32R_FPGA_VERSION_ADDR, 8);
 520
 521         cpu_model0[16] = '\0';
 522         for (i = 15 ; i >= 0 ; i--) {
 523                 if (cpu_model0[i] != ' ')
 524                         break;
 525                 cpu_model0[i] = '\0';
 526         }
 527         cpu_model1[16] = '\0';
 528         for (i = 15 ; i >= 0 ; i--) {
 529                 if (cpu_model1[i] != ' ')
 530                         break;
 531                 cpu_model1[i] = '\0';
 532         }
 533         cpu_ver[8] = '\0';
 534         for (i = 7 ; i >= 0 ; i--) {
 535                 if (cpu_ver[i] != ' ')
 536                         break;
 537                 cpu_ver[i] = '\0';
 538         }
 539
 540         printk(KERN_INFO "M32R-mp information\n");
 541         printk(KERN_INFO "  On-chip CPUs : %d\n", nr_cpu);
 542         printk(KERN_INFO "  CPU model : %s/%s(%s)\n", cpu_model0,
 543                 cpu_model1, cpu_ver);
 544 }
 545
 546 /*
 547  * The bootstrap kernel entry code has set these up. Save them for
 548  * a given CPU
 549  */
 550 static void __init smp_store_cpu_info(int cpu_id)
 551 {
 552         struct cpuinfo_m32r *ci = cpu_data + cpu_id;
 553
 554         *ci = boot_cpu_data;
 555         ci->loops_per_jiffy = loops_per_jiffy;
 556 }
 557
 558 static void __init show_cpu_info(int cpu_id)
 559 {
 560         struct cpuinfo_m32r *ci = &cpu_data[cpu_id];
 561
 562         printk("CPU#%d : ", cpu_id);
 563
 564 #define PRINT_CLOCK(name, value) \
 565         printk(name " clock %d.%02dMHz", \
 566                 ((value) / 1000000), ((value) % 1000000) / 10000)
 567
 568         PRINT_CLOCK("CPU", (int)ci->cpu_clock);
 569         PRINT_CLOCK(", Bus", (int)ci->bus_clock);
 570         printk(", loops_per_jiffy[%ld]\n", ci->loops_per_jiffy);
 571 }
 572
 573 /*
 574  * the frequency of the profiling timer can be changed
 575  * by writing a multiplier value into /proc/profile.
 576  */
 577 int setup_profiling_timer(unsigned int multiplier)
 578 {
 579         int i;
 580
 581         /*
 582          * Sanity check. [at least 500 APIC cycles should be
 583          * between APIC interrupts as a rule of thumb, to avoid
 584          * irqs flooding us]
 585          */
 586         if ( (!multiplier) || (calibration_result / multiplier < 500))
 587                 return -EINVAL;
 588
 589         /*
 590          * Set the new multiplier for each CPU. CPUs don't start using the
 591          * new values until the next timer interrupt in which they do process
 592          * accounting. At that time they also adjust their APIC timers
 593          * accordingly.
 594          */
 595         for_each_possible_cpu(i)
 596                 per_cpu(prof_multiplier, i) = multiplier;
 597
 598         return 0;
 599 }
 600
 601 /* Initialize all maps between cpu number and apicids */
 602 static void __init init_cpu_to_physid(void)
 603 {
 604         int  i;
 605
 606         for (i = 0 ; i < NR_CPUS ; i++) {
 607                 cpu_2_physid[i] = -1;
 608                 physid_2_cpu[i] = -1;
 609         }
 610 }
 611
 612 /*
 613  * set up a mapping between cpu and apicid. Uses logical apicids for multiquad,
 614  * else physical apic ids
 615  */
 616 static void __init map_cpu_to_physid(int cpu_id, int phys_id)
 617 {
 618         physid_2_cpu[phys_id] = cpu_id;
 619         cpu_2_physid[cpu_id] = phys_id;
 620 }
 621
 622 /*
 623  * undo a mapping between cpu and apicid. Uses logical apicids for multiquad,
 624  * else physical apic ids
 625  */
 626 static void __init unmap_cpu_to_physid(int cpu_id, int phys_id)
 627 {
 628         physid_2_cpu[phys_id] = -1;
 629         cpu_2_physid[cpu_id] = -1;
 630 }