arch/s390/kernel/processor.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright IBM Corp. 2008
   4  *  Author(s): Martin Schwidefsky ([email protected])
   5  */
   6
   7 #define KMSG_COMPONENT "cpu"
   8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
   9
  10 #include <linux/stop_machine.h>
  11 #include <linux/bitops.h>
  12 #include <linux/kernel.h>
  13 #include <linux/random.h>
  14 #include <linux/sched/mm.h>
  15 #include <linux/init.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/mm_types.h>
  18 #include <linux/delay.h>
  19 #include <linux/cpu.h>
  20 #include <linux/smp.h>
  21 #include <asm/text-patching.h>
  22 #include <asm/diag.h>
  23 #include <asm/facility.h>
  24 #include <asm/elf.h>
  25 #include <asm/lowcore.h>
  26 #include <asm/param.h>
  27 #include <asm/sclp.h>
  28 #include <asm/smp.h>
  29
  30 unsigned long __read_mostly elf_hwcap;
  31 char elf_platform[ELF_PLATFORM_SIZE];
  32
  33 struct cpu_info {
  34         unsigned int cpu_mhz_dynamic;
  35         unsigned int cpu_mhz_static;
  36         struct cpuid cpu_id;
  37 };
  38
  39 static DEFINE_PER_CPU(struct cpu_info, cpu_info);
  40 static DEFINE_PER_CPU(int, cpu_relax_retry);
  41
  42 static bool machine_has_cpu_mhz;
  43
  44 void __init cpu_detect_mhz_feature(void)
  45 {
  46         if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL)
  47                 machine_has_cpu_mhz = true;
  48 }
  49
  50 static void update_cpu_mhz(void *arg)
  51 {
  52         unsigned long mhz;
  53         struct cpu_info *c;
  54
  55         mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0);
  56         c = this_cpu_ptr(&cpu_info);
  57         c->cpu_mhz_dynamic = mhz >> 32;
  58         c->cpu_mhz_static = mhz & 0xffffffff;
  59 }
  60
  61 void s390_update_cpu_mhz(void)
  62 {
  63         s390_adjust_jiffies();
  64         if (machine_has_cpu_mhz)
  65                 on_each_cpu(update_cpu_mhz, NULL, 0);
  66 }
  67
  68 void notrace stop_machine_yield(const struct cpumask *cpumask)
  69 {
  70         int cpu, this_cpu;
  71
  72         this_cpu = smp_processor_id();
  73         if (__this_cpu_inc_return(cpu_relax_retry) >= spin_retry) {
  74                 __this_cpu_write(cpu_relax_retry, 0);
  75                 cpu = cpumask_next_wrap(this_cpu, cpumask, this_cpu, false);
  76                 if (cpu >= nr_cpu_ids)
  77                         return;
  78                 if (arch_vcpu_is_preempted(cpu))
  79                         smp_yield_cpu(cpu);
  80         }
  81 }
  82
  83 static void do_sync_core(void *info)
  84 {
  85         sync_core();
  86 }
  87
  88 void text_poke_sync(void)
  89 {
  90         on_each_cpu(do_sync_core, NULL, 1);
  91 }
  92
  93 void text_poke_sync_lock(void)
  94 {
  95         cpus_read_lock();
  96         text_poke_sync();
  97         cpus_read_unlock();
  98 }
  99
 100 /*
 101  * cpu_init - initializes state that is per-CPU.
 102  */
 103 void cpu_init(void)
 104 {
 105         struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
 106
 107         get_cpu_id(id);
 108         if (machine_has_cpu_mhz)
 109                 update_cpu_mhz(NULL);
 110         mmgrab(&init_mm);
 111         current->active_mm = &init_mm;
 112         BUG_ON(current->mm);
 113         enter_lazy_tlb(&init_mm, current);
 114 }
 115
 116 static void show_facilities(struct seq_file *m)
 117 {
 118         unsigned int bit;
 119
 120         seq_puts(m, "facilities      :");
 121         for_each_set_bit_inv(bit, (long *)&stfle_fac_list, MAX_FACILITY_BIT)
 122                 seq_printf(m, " %d", bit);
 123         seq_putc(m, '\n');
 124 }
 125
 126 static void show_cpu_summary(struct seq_file *m, void *v)
 127 {
 128         static const char *hwcap_str[] = {
 129                 [HWCAP_NR_ESAN3]        = "esan3",
 130                 [HWCAP_NR_ZARCH]        = "zarch",
 131                 [HWCAP_NR_STFLE]        = "stfle",
 132                 [HWCAP_NR_MSA]          = "msa",
 133                 [HWCAP_NR_LDISP]        = "ldisp",
 134                 [HWCAP_NR_EIMM]         = "eimm",
 135                 [HWCAP_NR_DFP]          = "dfp",
 136                 [HWCAP_NR_HPAGE]        = "edat",
 137                 [HWCAP_NR_ETF3EH]       = "etf3eh",
 138                 [HWCAP_NR_HIGH_GPRS]    = "highgprs",
 139                 [HWCAP_NR_TE]           = "te",
 140                 [HWCAP_NR_VXRS]         = "vx",
 141                 [HWCAP_NR_VXRS_BCD]     = "vxd",
 142                 [HWCAP_NR_VXRS_EXT]     = "vxe",
 143                 [HWCAP_NR_GS]           = "gs",
 144                 [HWCAP_NR_VXRS_EXT2]    = "vxe2",
 145                 [HWCAP_NR_VXRS_PDE]     = "vxp",
 146                 [HWCAP_NR_SORT]         = "sort",
 147                 [HWCAP_NR_DFLT]         = "dflt",
 148                 [HWCAP_NR_VXRS_PDE2]    = "vxp2",
 149                 [HWCAP_NR_NNPA]         = "nnpa",
 150                 [HWCAP_NR_PCI_MIO]      = "pcimio",
 151                 [HWCAP_NR_SIE]          = "sie",
 152         };
 153         int i, cpu;
 154
 155         BUILD_BUG_ON(ARRAY_SIZE(hwcap_str) != HWCAP_NR_MAX);
 156         seq_printf(m, "vendor_id       : IBM/S390\n"
 157                    "# processors    : %i\n"
 158                    "bogomips per cpu: %lu.%02lu\n",
 159                    num_online_cpus(), loops_per_jiffy/(500000/HZ),
 160                    (loops_per_jiffy/(5000/HZ))%100);
 161         seq_printf(m, "max thread id   : %d\n", smp_cpu_mtid);
 162         seq_puts(m, "features\t: ");
 163         for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
 164                 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 165                         seq_printf(m, "%s ", hwcap_str[i]);
 166         seq_puts(m, "\n");
 167         show_facilities(m);
 168         show_cacheinfo(m);
 169         for_each_online_cpu(cpu) {
 170                 struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
 171
 172                 seq_printf(m, "processor %d: "
 173                            "version = %02X,  "
 174                            "identification = %06X,  "
 175                            "machine = %04X\n",
 176                            cpu, id->version, id->ident, id->machine);
 177         }
 178 }
 179
 180 static int __init setup_hwcaps(void)
 181 {
 182         /* instructions named N3, "backported" to esa-mode */
 183         elf_hwcap |= HWCAP_ESAN3;
 184
 185         /* z/Architecture mode active */
 186         elf_hwcap |= HWCAP_ZARCH;
 187
 188         /* store-facility-list-extended */
 189         if (test_facility(7))
 190                 elf_hwcap |= HWCAP_STFLE;
 191
 192         /* message-security assist */
 193         if (test_facility(17))
 194                 elf_hwcap |= HWCAP_MSA;
 195
 196         /* long-displacement */
 197         if (test_facility(19))
 198                 elf_hwcap |= HWCAP_LDISP;
 199
 200         /* extended-immediate */
 201         elf_hwcap |= HWCAP_EIMM;
 202
 203         /* extended-translation facility 3 enhancement */
 204         if (test_facility(22) && test_facility(30))
 205                 elf_hwcap |= HWCAP_ETF3EH;
 206
 207         /* decimal floating point & perform floating point operation */
 208         if (test_facility(42) && test_facility(44))
 209                 elf_hwcap |= HWCAP_DFP;
 210
 211         /* huge page support */
 212         if (MACHINE_HAS_EDAT1)
 213                 elf_hwcap |= HWCAP_HPAGE;
 214
 215         /* 64-bit register support for 31-bit processes */
 216         elf_hwcap |= HWCAP_HIGH_GPRS;
 217
 218         /* transactional execution */
 219         if (MACHINE_HAS_TE)
 220                 elf_hwcap |= HWCAP_TE;
 221
 222         /* vector */
 223         if (test_facility(129)) {
 224                 elf_hwcap |= HWCAP_VXRS;
 225                 if (test_facility(134))
 226                         elf_hwcap |= HWCAP_VXRS_BCD;
 227                 if (test_facility(135))
 228                         elf_hwcap |= HWCAP_VXRS_EXT;
 229                 if (test_facility(148))
 230                         elf_hwcap |= HWCAP_VXRS_EXT2;
 231                 if (test_facility(152))
 232                         elf_hwcap |= HWCAP_VXRS_PDE;
 233                 if (test_facility(192))
 234                         elf_hwcap |= HWCAP_VXRS_PDE2;
 235         }
 236
 237         if (test_facility(150))
 238                 elf_hwcap |= HWCAP_SORT;
 239
 240         if (test_facility(151))
 241                 elf_hwcap |= HWCAP_DFLT;
 242
 243         if (test_facility(165))
 244                 elf_hwcap |= HWCAP_NNPA;
 245
 246         /* guarded storage */
 247         if (MACHINE_HAS_GS)
 248                 elf_hwcap |= HWCAP_GS;
 249
 250         if (MACHINE_HAS_PCI_MIO)
 251                 elf_hwcap |= HWCAP_PCI_MIO;
 252
 253         /* virtualization support */
 254         if (sclp.has_sief2)
 255                 elf_hwcap |= HWCAP_SIE;
 256
 257         return 0;
 258 }
 259 arch_initcall(setup_hwcaps);
 260
 261 static int __init setup_elf_platform(void)
 262 {
 263         struct cpuid cpu_id;
 264
 265         get_cpu_id(&cpu_id);
 266         add_device_randomness(&cpu_id, sizeof(cpu_id));
 267         switch (cpu_id.machine) {
 268         default:        /* Use "z10" as default. */
 269                 strcpy(elf_platform, "z10");
 270                 break;
 271         case 0x2817:
 272         case 0x2818:
 273                 strcpy(elf_platform, "z196");
 274                 break;
 275         case 0x2827:
 276         case 0x2828:
 277                 strcpy(elf_platform, "zEC12");
 278                 break;
 279         case 0x2964:
 280         case 0x2965:
 281                 strcpy(elf_platform, "z13");
 282                 break;
 283         case 0x3906:
 284         case 0x3907:
 285                 strcpy(elf_platform, "z14");
 286                 break;
 287         case 0x8561:
 288         case 0x8562:
 289                 strcpy(elf_platform, "z15");
 290                 break;
 291         case 0x3931:
 292         case 0x3932:
 293                 strcpy(elf_platform, "z16");
 294                 break;
 295         }
 296         return 0;
 297 }
 298 arch_initcall(setup_elf_platform);
 299
 300 static void show_cpu_topology(struct seq_file *m, unsigned long n)
 301 {
 302 #ifdef CONFIG_SCHED_TOPOLOGY
 303         seq_printf(m, "physical id     : %d\n", topology_physical_package_id(n));
 304         seq_printf(m, "core id         : %d\n", topology_core_id(n));
 305         seq_printf(m, "book id         : %d\n", topology_book_id(n));
 306         seq_printf(m, "drawer id       : %d\n", topology_drawer_id(n));
 307         seq_printf(m, "dedicated       : %d\n", topology_cpu_dedicated(n));
 308         seq_printf(m, "address         : %d\n", smp_cpu_get_cpu_address(n));
 309         seq_printf(m, "siblings        : %d\n", cpumask_weight(topology_core_cpumask(n)));
 310         seq_printf(m, "cpu cores       : %d\n", topology_booted_cores(n));
 311 #endif /* CONFIG_SCHED_TOPOLOGY */
 312 }
 313
 314 static void show_cpu_ids(struct seq_file *m, unsigned long n)
 315 {
 316         struct cpuid *id = &per_cpu(cpu_info.cpu_id, n);
 317
 318         seq_printf(m, "version         : %02X\n", id->version);
 319         seq_printf(m, "identification  : %06X\n", id->ident);
 320         seq_printf(m, "machine         : %04X\n", id->machine);
 321 }
 322
 323 static void show_cpu_mhz(struct seq_file *m, unsigned long n)
 324 {
 325         struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
 326
 327         if (!machine_has_cpu_mhz)
 328                 return;
 329         seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
 330         seq_printf(m, "cpu MHz static  : %d\n", c->cpu_mhz_static);
 331 }
 332
 333 /*
 334  * show_cpuinfo - Get information on one CPU for use by procfs.
 335  */
 336 static int show_cpuinfo(struct seq_file *m, void *v)
 337 {
 338         unsigned long n = (unsigned long) v - 1;
 339         unsigned long first = cpumask_first(cpu_online_mask);
 340
 341         if (n == first)
 342                 show_cpu_summary(m, v);
 343         seq_printf(m, "\ncpu number      : %ld\n", n);
 344         show_cpu_topology(m, n);
 345         show_cpu_ids(m, n);
 346         show_cpu_mhz(m, n);
 347         return 0;
 348 }
 349
 350 static inline void *c_update(loff_t *pos)
 351 {
 352         if (*pos)
 353                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 354         else
 355                 *pos = cpumask_first(cpu_online_mask);
 356         return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
 357 }
 358
 359 static void *c_start(struct seq_file *m, loff_t *pos)
 360 {
 361         cpus_read_lock();
 362         return c_update(pos);
 363 }
 364
 365 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 366 {
 367         ++*pos;
 368         return c_update(pos);
 369 }
 370
 371 static void c_stop(struct seq_file *m, void *v)
 372 {
 373         cpus_read_unlock();
 374 }
 375
 376 const struct seq_operations cpuinfo_op = {
 377         .start  = c_start,
 378         .next   = c_next,
 379         .stop   = c_stop,
 380         .show   = show_cpuinfo,
 381 };