arch/parisc/kernel/processor.c

   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/topology.h>
  23 #include <asm/param.h>
  24 #include <asm/cache.h>
  25 #include <asm/hardware.h>       /* for register_parisc_driver() stuff */
  26 #include <asm/processor.h>
  27 #include <asm/page.h>
  28 #include <asm/pdc.h>
  29 #include <asm/smp.h>
  30 #include <asm/pdcpat.h>
  31 #include <asm/irq.h>            /* for struct irq_region */
  32 #include <asm/parisc-device.h>
  33
  34 struct system_cpuinfo_parisc boot_cpu_data __ro_after_init;
  35 EXPORT_SYMBOL(boot_cpu_data);
  36 #ifdef CONFIG_PA8X00
  37 int _parisc_requires_coherency __ro_after_init;
  38 EXPORT_SYMBOL(_parisc_requires_coherency);
  39 #endif
  40
  41 DEFINE_PER_CPU(struct cpuinfo_parisc, cpu_data);
  42
  43 /*
  44 **      PARISC CPU driver - claim "device" and initialize CPU data structures.
  45 **
  46 ** Consolidate per CPU initialization into (mostly) one module.
  47 ** Monarch CPU will initialize boot_cpu_data which shouldn't
  48 ** change once the system has booted.
  49 **
  50 ** The callback *should* do per-instance initialization of
  51 ** everything including the monarch. "Per CPU" init code in
  52 ** setup.c:start_parisc() has migrated here and start_parisc()
  53 ** will call register_parisc_driver(&cpu_driver) before calling do_inventory().
  54 **
  55 ** The goal of consolidating CPU initialization into one place is
  56 ** to make sure all CPUs get initialized the same way.
  57 ** The code path not shared is how PDC hands control of the CPU to the OS.
  58 ** The initialization of OS data structures is the same (done below).
  59 */
  60
  61 /**
  62  * init_percpu_prof - enable/setup per cpu profiling hooks.
  63  * @cpunum: The processor instance.
  64  *
  65  * FIXME: doesn't do much yet...
  66  */
  67 static void
  68 init_percpu_prof(unsigned long cpunum)
  69 {
  70 }
  71
  72
  73 /**
  74  * processor_probe - Determine if processor driver should claim this device.
  75  * @dev: The device which has been found.
  76  *
  77  * Determine if processor driver should claim this chip (return 0) or not
  78  * (return 1).  If so, initialize the chip and tell other partners in crime
  79  * they have work to do.
  80  */
  81 static int __init processor_probe(struct parisc_device *dev)
  82 {
  83         unsigned long txn_addr;
  84         unsigned long cpuid;
  85         struct cpuinfo_parisc *p;
  86         struct pdc_pat_cpu_num cpu_info = { };
  87
  88 #ifdef CONFIG_SMP
  89         if (num_online_cpus() >= nr_cpu_ids) {
  90                 printk(KERN_INFO "num_online_cpus() >= nr_cpu_ids\n");
  91                 return 1;
  92         }
  93 #else
  94         if (boot_cpu_data.cpu_count > 0) {
  95                 printk(KERN_INFO "CONFIG_SMP=n  ignoring additional CPUs\n");
  96                 return 1;
  97         }
  98 #endif
  99
 100         /* logical CPU ID and update global counter
 101          * May get overwritten by PAT code.
 102          */
 103         cpuid = boot_cpu_data.cpu_count;
 104         txn_addr = dev->hpa.start;      /* for legacy PDC */
 105         cpu_info.cpu_num = cpu_info.cpu_loc = cpuid;
 106
 107 #ifdef CONFIG_64BIT
 108         if (is_pdc_pat()) {
 109                 ulong status;
 110                 unsigned long bytecnt;
 111                 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
 112
 113                 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
 114                 if (!pa_pdc_cell)
 115                         panic("couldn't allocate memory for PDC_PAT_CELL!");
 116
 117                 status = pdc_pat_cell_module(&bytecnt, dev->pcell_loc,
 118                         dev->mod_index, PA_VIEW, pa_pdc_cell);
 119
 120                 BUG_ON(PDC_OK != status);
 121
 122                 /* verify it's the same as what do_pat_inventory() found */
 123                 BUG_ON(dev->mod_info != pa_pdc_cell->mod_info);
 124                 BUG_ON(dev->pmod_loc != pa_pdc_cell->mod_location);
 125
 126                 txn_addr = pa_pdc_cell->mod[0];   /* id_eid for IO sapic */
 127
 128                 kfree(pa_pdc_cell);
 129
 130                 /* get the cpu number */
 131                 status = pdc_pat_cpu_get_number(&cpu_info, dev->hpa.start);
 132                 BUG_ON(PDC_OK != status);
 133
 134                 pr_info("Logical CPU #%lu is physical cpu #%lu at location "
 135                         "0x%lx with hpa %pa\n",
 136                         cpuid, cpu_info.cpu_num, cpu_info.cpu_loc,
 137                         &dev->hpa.start);
 138
 139 #undef USE_PAT_CPUID
 140 #ifdef USE_PAT_CPUID
 141 /* We need contiguous numbers for cpuid. Firmware's notion
 142  * of cpuid is for physical CPUs and we just don't care yet.
 143  * We'll care when we need to query PAT PDC about a CPU *after*
 144  * boot time (ie shutdown a CPU from an OS perspective).
 145  */
 146                 if (cpu_info.cpu_num >= NR_CPUS) {
 147                         printk(KERN_WARNING "IGNORING CPU at %pa,"
 148                                 " cpu_slot_id > NR_CPUS"
 149                                 " (%ld > %d)\n",
 150                                 &dev->hpa.start, cpu_info.cpu_num, NR_CPUS);
 151                         /* Ignore CPU since it will only crash */
 152                         boot_cpu_data.cpu_count--;
 153                         return 1;
 154                 } else {
 155                         cpuid = cpu_info.cpu_num;
 156                 }
 157 #endif
 158         }
 159 #endif
 160
 161         p = &per_cpu(cpu_data, cpuid);
 162         boot_cpu_data.cpu_count++;
 163
 164         /* initialize counters - CPU 0 gets it_value set in time_init() */
 165         if (cpuid)
 166                 memset(p, 0, sizeof(struct cpuinfo_parisc));
 167
 168         p->dev = dev;           /* Save IODC data in case we need it */
 169         p->hpa = dev->hpa.start;        /* save CPU hpa */
 170         p->cpuid = cpuid;       /* save CPU id */
 171         p->txn_addr = txn_addr; /* save CPU IRQ address */
 172         p->cpu_num = cpu_info.cpu_num;
 173         p->cpu_loc = cpu_info.cpu_loc;
 174
 175         store_cpu_topology(cpuid);
 176
 177 #ifdef CONFIG_SMP
 178         /*
 179         ** FIXME: review if any other initialization is clobbered
 180         **        for boot_cpu by the above memset().
 181         */
 182         init_percpu_prof(cpuid);
 183 #endif
 184
 185         /*
 186         ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
 187         ** OS control. RENDEZVOUS is the default state - see mem_set above.
 188         **      p->state = STATE_RENDEZVOUS;
 189         */
 190
 191 #if 0
 192         /* CPU 0 IRQ table is statically allocated/initialized */
 193         if (cpuid) {
 194                 struct irqaction actions[];
 195
 196                 /*
 197                 ** itimer and ipi IRQ handlers are statically initialized in
 198                 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
 199                 */
 200                 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
 201                 if (!actions) {
 202                         /* not getting it's own table, share with monarch */
 203                         actions = cpu_irq_actions[0];
 204                 }
 205
 206                 cpu_irq_actions[cpuid] = actions;
 207         }
 208 #endif
 209
 210         /*
 211          * Bring this CPU up now! (ignore bootstrap cpuid == 0)
 212          */
 213 #ifdef CONFIG_SMP
 214         if (cpuid) {
 215                 set_cpu_present(cpuid, true);
 216                 add_cpu(cpuid);
 217         }
 218 #endif
 219
 220         return 0;
 221 }
 222
 223 /**
 224  * collect_boot_cpu_data - Fill the boot_cpu_data structure.
 225  *
 226  * This function collects and stores the generic processor information
 227  * in the boot_cpu_data structure.
 228  */
 229 void __init collect_boot_cpu_data(void)
 230 {
 231         unsigned long cr16_seed;
 232         char orig_prod_num[64], current_prod_num[64], serial_no[64];
 233
 234         memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
 235
 236         cr16_seed = get_cycles();
 237         add_device_randomness(&cr16_seed, sizeof(cr16_seed));
 238
 239         boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
 240
 241         /* get CPU-Model Information... */
 242 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
 243         if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) {
 244                 printk(KERN_INFO
 245                         "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 246                         p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9]);
 247
 248                 add_device_randomness(&boot_cpu_data.pdc.model,
 249                         sizeof(boot_cpu_data.pdc.model));
 250         }
 251 #undef p
 252
 253         if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) {
 254                 printk(KERN_INFO "vers  %08lx\n",
 255                         boot_cpu_data.pdc.versions);
 256
 257                 add_device_randomness(&boot_cpu_data.pdc.versions,
 258                         sizeof(boot_cpu_data.pdc.versions));
 259         }
 260
 261         if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) {
 262                 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
 263                         (boot_cpu_data.pdc.cpuid >> 5) & 127,
 264                         boot_cpu_data.pdc.cpuid & 31,
 265                         boot_cpu_data.pdc.cpuid);
 266
 267                 add_device_randomness(&boot_cpu_data.pdc.cpuid,
 268                         sizeof(boot_cpu_data.pdc.cpuid));
 269         }
 270
 271         if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
 272                 printk(KERN_INFO "capabilities 0x%lx\n",
 273                         boot_cpu_data.pdc.capabilities);
 274
 275         if (pdc_model_sysmodel(OS_ID_HPUX, boot_cpu_data.pdc.sys_model_name) == PDC_OK)
 276                 pr_info("HP-UX model name: %s\n",
 277                         boot_cpu_data.pdc.sys_model_name);
 278
 279         serial_no[0] = 0;
 280         if (pdc_model_sysmodel(OS_ID_MPEXL, serial_no) == PDC_OK &&
 281                 serial_no[0])
 282                 pr_info("MPE/iX model name: %s\n", serial_no);
 283
 284         dump_stack_set_arch_desc("%s", boot_cpu_data.pdc.sys_model_name);
 285
 286         boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
 287         boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;
 288
 289         boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
 290         boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
 291         boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
 292
 293 #ifdef CONFIG_PA8X00
 294         _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
 295                                 (boot_cpu_data.cpu_type == mako2);
 296 #endif
 297
 298         if (pdc_model_platform_info(orig_prod_num, current_prod_num, serial_no) == PDC_OK) {
 299                 printk(KERN_INFO "product %s, original product %s, S/N: %s\n",
 300                         current_prod_num[0] ? current_prod_num : "n/a",
 301                         orig_prod_num, serial_no);
 302                 add_device_randomness(orig_prod_num, strlen(orig_prod_num));
 303                 add_device_randomness(current_prod_num, strlen(current_prod_num));
 304                 add_device_randomness(serial_no, strlen(serial_no));
 305         }
 306 }
 307
 308
 309 /**
 310  * init_per_cpu - Handle individual processor initializations.
 311  * @cpunum: logical processor number.
 312  *
 313  * This function handles initialization for *every* CPU
 314  * in the system:
 315  *
 316  * o Set "default" CPU width for trap handlers
 317  *
 318  * o Enable FP coprocessor
 319  *   REVISIT: this could be done in the "code 22" trap handler.
 320  *      (frowands idea - that way we know which processes need FP
 321  *      registers saved on the interrupt stack.)
 322  *   NEWS FLASH: wide kernels need FP coprocessor enabled to handle
 323  *      formatted printing of %lx for example (double divides I think)
 324  *
 325  * o Enable CPU profiling hooks.
 326  */
 327 int init_per_cpu(int cpunum)
 328 {
 329         int ret;
 330         struct pdc_coproc_cfg coproc_cfg;
 331
 332         set_firmware_width();
 333         ret = pdc_coproc_cfg(&coproc_cfg);
 334
 335         if(ret >= 0 && coproc_cfg.ccr_functional) {
 336                 mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */
 337
 338                 /* FWIW, FP rev/model is a more accurate way to determine
 339                 ** CPU type. CPU rev/model has some ambiguous cases.
 340                 */
 341                 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
 342                 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
 343
 344                 if (cpunum == 0)
 345                         printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
 346                                 cpunum, coproc_cfg.revision, coproc_cfg.model);
 347
 348                 /*
 349                 ** store status register to stack (hopefully aligned)
 350                 ** and clear the T-bit.
 351                 */
 352                 asm volatile ("fstd    %fr0,8(%sp)");
 353
 354         } else {
 355                 printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
 356                         " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
 357 #ifdef CONFIG_64BIT
 358                         "Halting Machine - FP required\n"
 359 #endif
 360                         , coproc_cfg.ccr_functional);
 361 #ifdef CONFIG_64BIT
 362                 mdelay(100);    /* previous chars get pushed to console */
 363                 panic("FP CoProc not reported");
 364 #endif
 365         }
 366
 367         /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
 368         init_percpu_prof(cpunum);
 369
 370         btlb_init_per_cpu();
 371
 372         return ret;
 373 }
 374
 375 /*
 376  * Display CPU info for all CPUs.
 377  */
 378 int
 379 show_cpuinfo (struct seq_file *m, void *v)
 380 {
 381         unsigned long cpu;
 382         char cpu_name[60], *p;
 383
 384         /* strip PA path from CPU name to not confuse lscpu */
 385         strscpy(cpu_name, per_cpu(cpu_data, 0).dev->name, sizeof(cpu_name));
 386         p = strrchr(cpu_name, '[');
 387         if (p)
 388                 *(--p) = 0;
 389
 390         for_each_online_cpu(cpu) {
 391 #ifdef CONFIG_SMP
 392                 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
 393
 394                 if (0 == cpuinfo->hpa)
 395                         continue;
 396 #endif
 397                 seq_printf(m, "processor\t: %lu\n"
 398                                 "cpu family\t: PA-RISC %s\n",
 399                                  cpu, boot_cpu_data.family_name);
 400
 401                 seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );
 402
 403                 /* cpu MHz */
 404                 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
 405                                  boot_cpu_data.cpu_hz / 1000000,
 406                                  boot_cpu_data.cpu_hz % 1000000  );
 407
 408 #ifdef CONFIG_GENERIC_ARCH_TOPOLOGY
 409                 seq_printf(m, "physical id\t: %d\n",
 410                                 topology_physical_package_id(cpu));
 411                 seq_printf(m, "siblings\t: %d\n",
 412                                 cpumask_weight(topology_core_cpumask(cpu)));
 413                 seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu));
 414 #endif
 415
 416                 seq_printf(m, "capabilities\t:");
 417                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
 418                         seq_puts(m, " os32");
 419                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
 420                         seq_puts(m, " os64");
 421                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)
 422                         seq_puts(m, " iopdir_fdc");
 423                 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) {
 424                 case PDC_MODEL_NVA_SUPPORTED:
 425                         seq_puts(m, " nva_supported");
 426                         break;
 427                 case PDC_MODEL_NVA_SLOW:
 428                         seq_puts(m, " nva_slow");
 429                         break;
 430                 case PDC_MODEL_NVA_UNSUPPORTED:
 431                         seq_puts(m, " needs_equivalent_aliasing");
 432                         break;
 433                 }
 434                 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities);
 435
 436                 seq_printf(m, "model\t\t: %s - %s\n",
 437                                  boot_cpu_data.pdc.sys_model_name,
 438                                  cpu_name);
 439
 440                 seq_printf(m, "hversion\t: 0x%08x\n"
 441                                 "sversion\t: 0x%08x\n",
 442                                  boot_cpu_data.hversion,
 443                                  boot_cpu_data.sversion );
 444
 445                 /* print cachesize info */
 446                 show_cache_info(m);
 447
 448                 seq_printf(m, "bogomips\t: %lu.%02lu\n",
 449                              loops_per_jiffy / (500000 / HZ),
 450                              loops_per_jiffy / (5000 / HZ) % 100);
 451
 452                 seq_printf(m, "software id\t: %ld\n\n",
 453                                 boot_cpu_data.pdc.model.sw_id);
 454         }
 455         return 0;
 456 }
 457
 458 static const struct parisc_device_id processor_tbl[] __initconst = {
 459         { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
 460         { 0, }
 461 };
 462
 463 static struct parisc_driver cpu_driver __refdata = {
 464         .name           = "CPU",
 465         .id_table       = processor_tbl,
 466         .probe          = processor_probe
 467 };
 468
 469 /**
 470  * processor_init - Processor initialization procedure.
 471  *
 472  * Register this driver.
 473  */
 474 void __init processor_init(void)
 475 {
 476         reset_cpu_topology();
 477         register_parisc_driver(&cpu_driver);
 478 }