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