root/arch/parisc/kernel/processor.c

DEFINITIONS

1. init_percpu_prof
2. processor_probe
3. collect_boot_cpu_data
4. init_per_cpu
5. show_cpuinfo
6. processor_init

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *    Initial setup-routines for HP 9000 based hardware.
   4  *
   5  *    Copyright (C) 1991, 1992, 1995  Linus Torvalds
   6  *    Modifications for PA-RISC (C) 1999-2008 Helge Deller <deller@gmx.de>
   7  *    Modifications copyright 1999 SuSE GmbH (Philipp Rumpf)
   8  *    Modifications copyright 2000 Martin K. Petersen <mkp@mkp.net>
   9  *    Modifications copyright 2000 Philipp Rumpf <prumpf@tux.org>
  10  *    Modifications copyright 2001 Ryan Bradetich <rbradetich@uswest.net>
  11  *
  12  *    Initial PA-RISC Version: 04-23-1999 by Helge Deller
  13  */
  14 #include <linux/delay.h>
  15 #include <linux/init.h>
  16 #include <linux/mm.h>
  17 #include <linux/module.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/random.h>
  20 #include <linux/slab.h>
  21 #include <linux/cpu.h>
  22 #include <asm/param.h>
  23 #include <asm/cache.h>
  24 #include <asm/hardware.h>       /* for register_parisc_driver() stuff */
  25 #include <asm/processor.h>
  26 #include <asm/page.h>
  27 #include <asm/pdc.h>
  28 #include <asm/pdcpat.h>
  29 #include <asm/irq.h>            /* for struct irq_region */
  30 #include <asm/parisc-device.h>
  31 
  32 struct system_cpuinfo_parisc boot_cpu_data __ro_after_init;
  33 EXPORT_SYMBOL(boot_cpu_data);
  34 #ifdef CONFIG_PA8X00
  35 int _parisc_requires_coherency __ro_after_init;
  36 EXPORT_SYMBOL(_parisc_requires_coherency);
  37 #endif
  38 
  39 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
  40 
  41 /*
  42 **      PARISC CPU driver - claim "device" and initialize CPU data structures.
  43 **
  44 ** Consolidate per CPU initialization into (mostly) one module.
  45 ** Monarch CPU will initialize boot_cpu_data which shouldn't
  46 ** change once the system has booted.
  47 **
  48 ** The callback *should* do per-instance initialization of
  49 ** everything including the monarch. "Per CPU" init code in
  50 ** setup.c:start_parisc() has migrated here and start_parisc()
  51 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
  52 **
  53 ** The goal of consolidating CPU initialization into one place is
  54 ** to make sure all CPUs get initialized the same way.
  55 ** The code path not shared is how PDC hands control of the CPU to the OS.
  56 ** The initialization of OS data structures is the same (done below).
  57 */
  58 
  59 /**
  60  * init_cpu_profiler - enable/setup per cpu profiling hooks.
  61  * @cpunum: The processor instance.
  62  *
  63  * FIXME: doesn't do much yet...
  64  */
  65 static void
  66 init_percpu_prof(unsigned long cpunum)
  67 {
  68 }
  69 
  70 
  71 /**
  72  * processor_probe - Determine if processor driver should claim this device.
  73  * @dev: The device which has been found.
  74  *
  75  * Determine if processor driver should claim this chip (return 0) or not 
  76  * (return 1).  If so, initialize the chip and tell other partners in crime 
  77  * they have work to do.
  78  */
  79 static int __init processor_probe(struct parisc_device *dev)
  80 {
  81         unsigned long txn_addr;
  82         unsigned long cpuid;
  83         struct cpuinfo_parisc *p;
  84         struct pdc_pat_cpu_num cpu_info = { };
  85 
  86 #ifdef CONFIG_SMP
  87         if (num_online_cpus() >= nr_cpu_ids) {
  88                 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
  89                 return 1;
  90         }
  91 #else
  92         if (boot_cpu_data.cpu_count > 0) {
  93                 printk(KERN_INFO "CONFIG_SMP=n  ignoring additional CPUs\n");
  94                 return 1;
  95         }
  96 #endif
  97 
  98         /* logical CPU ID and update global counter
  99          * May get overwritten by PAT code.
 100          */
 101         cpuid = boot_cpu_data.cpu_count;
 102         txn_addr = dev->hpa.start;      /* for legacy PDC */
 103         cpu_info.cpu_num = cpu_info.cpu_loc = cpuid;
 104 
 105 #ifdef CONFIG_64BIT
 106         if (is_pdc_pat()) {
 107                 ulong status;
 108                 unsigned long bytecnt;
 109                 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
 110 
 111                 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
 112                 if (!pa_pdc_cell)
 113                         panic("couldn't allocate memory for PDC_PAT_CELL!");
 114 
 115                 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
 116                         dev->mod_index, PA_VIEW, pa_pdc_cell);
 117 
 118                 BUG_ON(PDC_OK != status);
 119 
 120                 /* verify it's the same as what do_pat_inventory() found */
 121                 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
 122                 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
 123 
 124                 txn_addr = pa_pdc_cell->mod[0];   /* id_eid for IO sapic */
 125 
 126                 kfree(pa_pdc_cell);
 127 
 128                 /* get the cpu number */
 129                 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
 130                 BUG_ON(PDC_OK != status);
 131 
 132                 pr_info("Logical CPU #%lu is physical cpu #%lu at location "
 133                         "0x%lx with hpa %pa\n",
 134                         cpuid, cpu_info.cpu_num, cpu_info.cpu_loc,
 135                         &dev->hpa.start);
 136 
 137 #undef USE_PAT_CPUID
 138 #ifdef USE_PAT_CPUID
 139 /* We need contiguous numbers for cpuid. Firmware's notion
 140  * of cpuid is for physical CPUs and we just don't care yet.
 141  * We'll care when we need to query PAT PDC about a CPU *after*
 142  * boot time (ie shutdown a CPU from an OS perspective).
 143  */
 144                 if (cpu_info.cpu_num >= NR_CPUS) {
 145                         printk(KERN_WARNING "IGNORING CPU at %pa,"
 146                                 " cpu_slot_id > NR_CPUS"
 147                                 " (%ld > %d)\n",
 148                                 &dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
 149                         /* Ignore CPU since it will only crash */
 150                         boot_cpu_data.cpu_count--;
 151                         return 1;
 152                 } else {
 153                         cpuid = cpu_info.cpu_num;
 154                 }
 155 #endif
 156         }
 157 #endif
 158 
 159         p = &per_cpu(cpu_data, cpuid);
 160         boot_cpu_data.cpu_count++;
 161 
 162         /* initialize counters - CPU 0 gets it_value set in time_init() */
 163         if (cpuid)
 164                 memset(p, 0, sizeof(struct cpuinfo_parisc));
 165 
 166         p->loops_per_jiffy = loops_per_jiffy;
 167         p->dev = dev;           /* Save IODC data in case we need it */
 168         p->hpa = dev->hpa.start;        /* save CPU hpa */
 169         p->cpuid = cpuid;       /* save CPU id */
 170         p->txn_addr = txn_addr; /* save CPU IRQ address */
 171         p->cpu_num = cpu_info.cpu_num;
 172         p->cpu_loc = cpu_info.cpu_loc;
 173 
 174         store_cpu_topology(cpuid);
 175 
 176 #ifdef CONFIG_SMP
 177         /*
 178         ** FIXME: review if any other initialization is clobbered
 179         **        for boot_cpu by the above memset().
 180         */
 181         init_percpu_prof(cpuid);
 182 #endif
 183 
 184         /*
 185         ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
 186         ** OS control. RENDEZVOUS is the default state - see mem_set above.
 187         **      p->state = STATE_RENDEZVOUS;
 188         */
 189 
 190 #if 0
 191         /* CPU 0 IRQ table is statically allocated/initialized */
 192         if (cpuid) {
 193                 struct irqaction actions[];
 194 
 195                 /*
 196                 ** itimer and ipi IRQ handlers are statically initialized in
 197                 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
 198                 */
 199                 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
 200                 if (!actions) {
 201                         /* not getting it's own table, share with monarch */
 202                         actions = cpu_irq_actions[0];
 203                 }
 204 
 205                 cpu_irq_actions[cpuid] = actions;
 206         }
 207 #endif
 208 
 209         /* 
 210          * Bring this CPU up now! (ignore bootstrap cpuid == 0)
 211          */
 212 #ifdef CONFIG_SMP
 213         if (cpuid) {
 214                 set_cpu_present(cpuid, true);
 215                 cpu_up(cpuid);
 216         }
 217 #endif
 218 
 219         return 0;
 220 }
 221 
 222 /**
 223  * collect_boot_cpu_data - Fill the boot_cpu_data structure.
 224  *
 225  * This function collects and stores the generic processor information
 226  * in the boot_cpu_data structure.
 227  */
 228 void __init collect_boot_cpu_data(void)
 229 {
 230         unsigned long cr16_seed;
 231         char orig_prod_num[64], current_prod_num[64], serial_no[64];
 232 
 233         memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
 234 
 235         cr16_seed = get_cycles();
 236         add_device_randomness(&cr16_seed, sizeof(cr16_seed));
 237 
 238         boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
 239 
 240         /* get CPU-Model Information... */
 241 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
 242         if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) {
 243                 printk(KERN_INFO 
 244                         "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 245                         p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
 246 
 247                 add_device_randomness(&boot_cpu_data.pdc.model,
 248                         sizeof(boot_cpu_data.pdc.model));
 249         }
 250 #undef p
 251 
 252         if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) {
 253                 printk(KERN_INFO "vers  %08lx\n", 
 254                         boot_cpu_data.pdc.versions);
 255 
 256                 add_device_randomness(&boot_cpu_data.pdc.versions,
 257                         sizeof(boot_cpu_data.pdc.versions));
 258         }
 259 
 260         if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) {
 261                 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
 262                         (boot_cpu_data.pdc.cpuid >> 5) & 127,
 263                         boot_cpu_data.pdc.cpuid & 31,
 264                         boot_cpu_data.pdc.cpuid);
 265 
 266                 add_device_randomness(&boot_cpu_data.pdc.cpuid,
 267                         sizeof(boot_cpu_data.pdc.cpuid));
 268         }
 269 
 270         if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
 271                 printk(KERN_INFO "capabilities 0x%lx\n",
 272                         boot_cpu_data.pdc.capabilities);
 273 
 274         if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
 275                 printk(KERN_INFO "model %s\n",
 276                         boot_cpu_data.pdc.sys_model_name);
 277 
 278         dump_stack_set_arch_desc("%s", boot_cpu_data.pdc.sys_model_name);
 279 
 280         boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
 281         boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;
 282 
 283         boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
 284         boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
 285         boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
 286 
 287 #ifdef CONFIG_PA8X00
 288         _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
 289                                 (boot_cpu_data.cpu_type == mako2);
 290 #endif
 291 
 292         if (pdc_model_platform_info(orig_prod_num, current_prod_num, serial_no) == PDC_OK) {
 293                 printk(KERN_INFO "product %s, original product %s, S/N: %s\n",
 294                         current_prod_num[0] ? current_prod_num : "n/a",
 295                         orig_prod_num, serial_no);
 296                 add_device_randomness(orig_prod_num, strlen(orig_prod_num));
 297                 add_device_randomness(current_prod_num, strlen(current_prod_num));
 298                 add_device_randomness(serial_no, strlen(serial_no));
 299         }
 300 }
 301 
 302 
 303 /**
 304  * init_per_cpu - Handle individual processor initializations.
 305  * @cpunum: logical processor number.
 306  *
 307  * This function handles initialization for *every* CPU
 308  * in the system:
 309  *
 310  * o Set "default" CPU width for trap handlers
 311  *
 312  * o Enable FP coprocessor
 313  *   REVISIT: this could be done in the "code 22" trap handler.
 314  *      (frowands idea - that way we know which processes need FP
 315  *      registers saved on the interrupt stack.)
 316  *   NEWS FLASH: wide kernels need FP coprocessor enabled to handle
 317  *      formatted printing of %lx for example (double divides I think)
 318  *
 319  * o Enable CPU profiling hooks.
 320  */
 321 int __init init_per_cpu(int cpunum)
 322 {
 323         int ret;
 324         struct pdc_coproc_cfg coproc_cfg;
 325 
 326         set_firmware_width();
 327         ret = pdc_coproc_cfg(&coproc_cfg);
 328 
 329         store_cpu_topology(cpunum);
 330 
 331         if(ret >= 0 && coproc_cfg.ccr_functional) {
 332                 mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */
 333 
 334                 /* FWIW, FP rev/model is a more accurate way to determine
 335                 ** CPU type. CPU rev/model has some ambiguous cases.
 336                 */
 337                 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
 338                 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
 339 
 340                 if (cpunum == 0)
 341                         printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
 342                                 cpunum, coproc_cfg.revision, coproc_cfg.model);
 343 
 344                 /*
 345                 ** store status register to stack (hopefully aligned)
 346                 ** and clear the T-bit.
 347                 */
 348                 asm volatile ("fstd    %fr0,8(%sp)");
 349 
 350         } else {
 351                 printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
 352                         " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
 353 #ifdef CONFIG_64BIT
 354                         "Halting Machine - FP required\n"
 355 #endif
 356                         , coproc_cfg.ccr_functional);
 357 #ifdef CONFIG_64BIT
 358                 mdelay(100);    /* previous chars get pushed to console */
 359                 panic("FP CoProc not reported");
 360 #endif
 361         }
 362 
 363         /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
 364         init_percpu_prof(cpunum);
 365 
 366         return ret;
 367 }
 368 
 369 /*
 370  * Display CPU info for all CPUs.
 371  */
 372 int
 373 show_cpuinfo (struct seq_file *m, void *v)
 374 {
 375         unsigned long cpu;
 376 
 377         for_each_online_cpu(cpu) {
 378                 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
 379 #ifdef CONFIG_SMP
 380                 if (0 == cpuinfo->hpa)
 381                         continue;
 382 #endif
 383                 seq_printf(m, "processor\t: %lu\n"
 384                                 "cpu family\t: PA-RISC %s\n",
 385                                  cpu, boot_cpu_data.family_name);
 386 
 387                 seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );
 388 
 389                 /* cpu MHz */
 390                 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
 391                                  boot_cpu_data.cpu_hz / 1000000,
 392                                  boot_cpu_data.cpu_hz % 1000000  );
 393 
 394 #ifdef CONFIG_PARISC_CPU_TOPOLOGY
 395                 seq_printf(m, "physical id\t: %d\n",
 396                                 topology_physical_package_id(cpu));
 397                 seq_printf(m, "siblings\t: %d\n",
 398                                 cpumask_weight(topology_core_cpumask(cpu)));
 399                 seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu));
 400 #endif
 401 
 402                 seq_printf(m, "capabilities\t:");
 403                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
 404                         seq_puts(m, " os32");
 405                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
 406                         seq_puts(m, " os64");
 407                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)
 408                         seq_puts(m, " iopdir_fdc");
 409                 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) {
 410                 case PDC_MODEL_NVA_SUPPORTED:
 411                         seq_puts(m, " nva_supported");
 412                         break;
 413                 case PDC_MODEL_NVA_SLOW:
 414                         seq_puts(m, " nva_slow");
 415                         break;
 416                 case PDC_MODEL_NVA_UNSUPPORTED:
 417                         seq_puts(m, " needs_equivalent_aliasing");
 418                         break;
 419                 }
 420                 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities);
 421 
 422                 seq_printf(m, "model\t\t: %s\n"
 423                                 "model name\t: %s\n",
 424                                  boot_cpu_data.pdc.sys_model_name,
 425                                  cpuinfo->dev ?
 426                                  cpuinfo->dev->name : "Unknown");
 427 
 428                 seq_printf(m, "hversion\t: 0x%08x\n"
 429                                 "sversion\t: 0x%08x\n",
 430                                  boot_cpu_data.hversion,
 431                                  boot_cpu_data.sversion );
 432 
 433                 /* print cachesize info */
 434                 show_cache_info(m);
 435 
 436                 seq_printf(m, "bogomips\t: %lu.%02lu\n",
 437                              cpuinfo->loops_per_jiffy / (500000 / HZ),
 438                              (cpuinfo->loops_per_jiffy / (5000 / HZ)) % 100);
 439 
 440                 seq_printf(m, "software id\t: %ld\n\n",
 441                                 boot_cpu_data.pdc.model.sw_id);
 442         }
 443         return 0;
 444 }
 445 
 446 static const struct parisc_device_id processor_tbl[] __initconst = {
 447         { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
 448         { 0, }
 449 };
 450 
 451 static struct parisc_driver cpu_driver __refdata = {
 452         .name           = "CPU",
 453         .id_table       = processor_tbl,
 454         .probe          = processor_probe
 455 };
 456 
 457 /**
 458  * processor_init - Processor initialization procedure.
 459  *
 460  * Register this driver.
 461  */
 462 void __init processor_init(void)
 463 {
 464         register_parisc_driver(&cpu_driver);
 465 }