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/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->dev = dev;           /* Save IODC data in case we need it */
 167         p->hpa = dev->hpa.start;        /* save CPU hpa */
 168         p->cpuid = cpuid;       /* save CPU id */
 169         p->txn_addr = txn_addr; /* save CPU IRQ address */
 170         p->cpu_num = cpu_info.cpu_num;
 171         p->cpu_loc = cpu_info.cpu_loc;
 172
 173         store_cpu_topology(cpuid);
 174
 175 #ifdef CONFIG_SMP
 176         /*
 177         ** FIXME: review if any other initialization is clobbered
 178         **        for boot_cpu by the above memset().
 179         */
 180         init_percpu_prof(cpuid);
 181 #endif
 182
 183         /*
 184         ** CONFIG_SMP: init_smp_config() will attempt to get CPUs into
 185         ** OS control. RENDEZVOUS is the default state - see mem_set above.
 186         **      p->state = STATE_RENDEZVOUS;
 187         */
 188
 189 #if 0
 190         /* CPU 0 IRQ table is statically allocated/initialized */
 191         if (cpuid) {
 192                 struct irqaction actions[];
 193
 194                 /*
 195                 ** itimer and ipi IRQ handlers are statically initialized in
 196                 ** arch/parisc/kernel/irq.c. ie Don't need to register them.
 197                 */
 198                 actions = kmalloc(sizeof(struct irqaction)*MAX_CPU_IRQ, GFP_ATOMIC);
 199                 if (!actions) {
 200                         /* not getting it's own table, share with monarch */
 201                         actions = cpu_irq_actions[0];
 202                 }
 203
 204                 cpu_irq_actions[cpuid] = actions;
 205         }
 206 #endif
 207
 208         /*
 209          * Bring this CPU up now! (ignore bootstrap cpuid == 0)
 210          */
 211 #ifdef CONFIG_SMP
 212         if (cpuid) {
 213                 set_cpu_present(cpuid, true);
 214                 add_cpu(cpuid);
 215         }
 216 #endif
 217
 218         return 0;
 219 }
 220
 221 /**
 222  * collect_boot_cpu_data - Fill the boot_cpu_data structure.
 223  *
 224  * This function collects and stores the generic processor information
 225  * in the boot_cpu_data structure.
 226  */
 227 void __init collect_boot_cpu_data(void)
 228 {
 229         unsigned long cr16_seed;
 230         char orig_prod_num[64], current_prod_num[64], serial_no[64];
 231
 232         memset(&boot_cpu_data, 0, sizeof(boot_cpu_data));
 233
 234         cr16_seed = get_cycles();
 235         add_device_randomness(&cr16_seed, sizeof(cr16_seed));
 236
 237         boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */
 238
 239         /* get CPU-Model Information... */
 240 #define p ((unsigned long *)&boot_cpu_data.pdc.model)
 241         if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) {
 242                 printk(KERN_INFO
 243                         "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
 244                         p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]);
 245
 246                 add_device_randomness(&boot_cpu_data.pdc.model,
 247                         sizeof(boot_cpu_data.pdc.model));
 248         }
 249 #undef p
 250
 251         if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) {
 252                 printk(KERN_INFO "vers  %08lx\n",
 253                         boot_cpu_data.pdc.versions);
 254
 255                 add_device_randomness(&boot_cpu_data.pdc.versions,
 256                         sizeof(boot_cpu_data.pdc.versions));
 257         }
 258
 259         if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) {
 260                 printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n",
 261                         (boot_cpu_data.pdc.cpuid >> 5) & 127,
 262                         boot_cpu_data.pdc.cpuid & 31,
 263                         boot_cpu_data.pdc.cpuid);
 264
 265                 add_device_randomness(&boot_cpu_data.pdc.cpuid,
 266                         sizeof(boot_cpu_data.pdc.cpuid));
 267         }
 268
 269         if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK)
 270                 printk(KERN_INFO "capabilities 0x%lx\n",
 271                         boot_cpu_data.pdc.capabilities);
 272
 273         if (pdc_model_sysmodel(boot_cpu_data.pdc.sys_model_name) == PDC_OK)
 274                 printk(KERN_INFO "model %s\n",
 275                         boot_cpu_data.pdc.sys_model_name);
 276
 277         dump_stack_set_arch_desc("%s", boot_cpu_data.pdc.sys_model_name);
 278
 279         boot_cpu_data.hversion =  boot_cpu_data.pdc.model.hversion;
 280         boot_cpu_data.sversion =  boot_cpu_data.pdc.model.sversion;
 281
 282         boot_cpu_data.cpu_type = parisc_get_cpu_type(boot_cpu_data.hversion);
 283         boot_cpu_data.cpu_name = cpu_name_version[boot_cpu_data.cpu_type][0];
 284         boot_cpu_data.family_name = cpu_name_version[boot_cpu_data.cpu_type][1];
 285
 286 #ifdef CONFIG_PA8X00
 287         _parisc_requires_coherency = (boot_cpu_data.cpu_type == mako) ||
 288                                 (boot_cpu_data.cpu_type == mako2);
 289 #endif
 290
 291         if (pdc_model_platform_info(orig_prod_num, current_prod_num, serial_no) == PDC_OK) {
 292                 printk(KERN_INFO "product %s, original product %s, S/N: %s\n",
 293                         current_prod_num[0] ? current_prod_num : "n/a",
 294                         orig_prod_num, serial_no);
 295                 add_device_randomness(orig_prod_num, strlen(orig_prod_num));
 296                 add_device_randomness(current_prod_num, strlen(current_prod_num));
 297                 add_device_randomness(serial_no, strlen(serial_no));
 298         }
 299 }
 300
 301
 302 /**
 303  * init_per_cpu - Handle individual processor initializations.
 304  * @cpunum: logical processor number.
 305  *
 306  * This function handles initialization for *every* CPU
 307  * in the system:
 308  *
 309  * o Set "default" CPU width for trap handlers
 310  *
 311  * o Enable FP coprocessor
 312  *   REVISIT: this could be done in the "code 22" trap handler.
 313  *      (frowands idea - that way we know which processes need FP
 314  *      registers saved on the interrupt stack.)
 315  *   NEWS FLASH: wide kernels need FP coprocessor enabled to handle
 316  *      formatted printing of %lx for example (double divides I think)
 317  *
 318  * o Enable CPU profiling hooks.
 319  */
 320 int __init init_per_cpu(int cpunum)
 321 {
 322         int ret;
 323         struct pdc_coproc_cfg coproc_cfg;
 324
 325         set_firmware_width();
 326         ret = pdc_coproc_cfg(&coproc_cfg);
 327
 328         store_cpu_topology(cpunum);
 329
 330         if(ret >= 0 && coproc_cfg.ccr_functional) {
 331                 mtctl(coproc_cfg.ccr_functional, 10);  /* 10 == Coprocessor Control Reg */
 332
 333                 /* FWIW, FP rev/model is a more accurate way to determine
 334                 ** CPU type. CPU rev/model has some ambiguous cases.
 335                 */
 336                 per_cpu(cpu_data, cpunum).fp_rev = coproc_cfg.revision;
 337                 per_cpu(cpu_data, cpunum).fp_model = coproc_cfg.model;
 338
 339                 if (cpunum == 0)
 340                         printk(KERN_INFO  "FP[%d] enabled: Rev %ld Model %ld\n",
 341                                 cpunum, coproc_cfg.revision, coproc_cfg.model);
 342
 343                 /*
 344                 ** store status register to stack (hopefully aligned)
 345                 ** and clear the T-bit.
 346                 */
 347                 asm volatile ("fstd    %fr0,8(%sp)");
 348
 349         } else {
 350                 printk(KERN_WARNING  "WARNING: No FP CoProcessor?!"
 351                         " (coproc_cfg.ccr_functional == 0x%lx, expected 0xc0)\n"
 352 #ifdef CONFIG_64BIT
 353                         "Halting Machine - FP required\n"
 354 #endif
 355                         , coproc_cfg.ccr_functional);
 356 #ifdef CONFIG_64BIT
 357                 mdelay(100);    /* previous chars get pushed to console */
 358                 panic("FP CoProc not reported");
 359 #endif
 360         }
 361
 362         /* FUTURE: Enable Performance Monitor : ccr bit 0x20 */
 363         init_percpu_prof(cpunum);
 364
 365         return ret;
 366 }
 367
 368 /*
 369  * Display CPU info for all CPUs.
 370  */
 371 int
 372 show_cpuinfo (struct seq_file *m, void *v)
 373 {
 374         unsigned long cpu;
 375
 376         for_each_online_cpu(cpu) {
 377                 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
 378 #ifdef CONFIG_SMP
 379                 if (0 == cpuinfo->hpa)
 380                         continue;
 381 #endif
 382                 seq_printf(m, "processor\t: %lu\n"
 383                                 "cpu family\t: PA-RISC %s\n",
 384                                  cpu, boot_cpu_data.family_name);
 385
 386                 seq_printf(m, "cpu\t\t: %s\n",  boot_cpu_data.cpu_name );
 387
 388                 /* cpu MHz */
 389                 seq_printf(m, "cpu MHz\t\t: %d.%06d\n",
 390                                  boot_cpu_data.cpu_hz / 1000000,
 391                                  boot_cpu_data.cpu_hz % 1000000  );
 392
 393 #ifdef CONFIG_PARISC_CPU_TOPOLOGY
 394                 seq_printf(m, "physical id\t: %d\n",
 395                                 topology_physical_package_id(cpu));
 396                 seq_printf(m, "siblings\t: %d\n",
 397                                 cpumask_weight(topology_core_cpumask(cpu)));
 398                 seq_printf(m, "core id\t\t: %d\n", topology_core_id(cpu));
 399 #endif
 400
 401                 seq_printf(m, "capabilities\t:");
 402                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)
 403                         seq_puts(m, " os32");
 404                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_OS64)
 405                         seq_puts(m, " os64");
 406                 if (boot_cpu_data.pdc.capabilities & PDC_MODEL_IOPDIR_FDC)
 407                         seq_puts(m, " iopdir_fdc");
 408                 switch (boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) {
 409                 case PDC_MODEL_NVA_SUPPORTED:
 410                         seq_puts(m, " nva_supported");
 411                         break;
 412                 case PDC_MODEL_NVA_SLOW:
 413                         seq_puts(m, " nva_slow");
 414                         break;
 415                 case PDC_MODEL_NVA_UNSUPPORTED:
 416                         seq_puts(m, " needs_equivalent_aliasing");
 417                         break;
 418                 }
 419                 seq_printf(m, " (0x%02lx)\n", boot_cpu_data.pdc.capabilities);
 420
 421                 seq_printf(m, "model\t\t: %s\n"
 422                                 "model name\t: %s\n",
 423                                  boot_cpu_data.pdc.sys_model_name,
 424                                  cpuinfo->dev ?
 425                                  cpuinfo->dev->name : "Unknown");
 426
 427                 seq_printf(m, "hversion\t: 0x%08x\n"
 428                                 "sversion\t: 0x%08x\n",
 429                                  boot_cpu_data.hversion,
 430                                  boot_cpu_data.sversion );
 431
 432                 /* print cachesize info */
 433                 show_cache_info(m);
 434
 435                 seq_printf(m, "bogomips\t: %lu.%02lu\n",
 436                              loops_per_jiffy / (500000 / HZ),
 437                              loops_per_jiffy / (5000 / HZ) % 100);
 438
 439                 seq_printf(m, "software id\t: %ld\n\n",
 440                                 boot_cpu_data.pdc.model.sw_id);
 441         }
 442         return 0;
 443 }
 444
 445 static const struct parisc_device_id processor_tbl[] __initconst = {
 446         { HPHW_NPROC, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, SVERSION_ANY_ID },
 447         { 0, }
 448 };
 449
 450 static struct parisc_driver cpu_driver __refdata = {
 451         .name           = "CPU",
 452         .id_table       = processor_tbl,
 453         .probe          = processor_probe
 454 };
 455
 456 /**
 457  * processor_init - Processor initialization procedure.
 458  *
 459  * Register this driver.
 460  */
 461 void __init processor_init(void)
 462 {
 463         register_parisc_driver(&cpu_driver);
 464 }