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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#define pr_fmt(fmt) "cpu: " fmt
#include <linux/stop_machine.h>#include <linux/cpufeature.h>#include <linux/bitops.h>#include <linux/kernel.h>#include <linux/random.h>#include <linux/sched/mm.h>#include <linux/init.h>#include <linux/seq_file.h>#include <linux/mm_types.h>#include <linux/delay.h>#include <linux/cpu.h>#include <linux/smp.h>#include <asm/text-patching.h>#include <asm/machine.h>#include <asm/diag.h>#include <asm/facility.h>#include <asm/elf.h>#include <asm/lowcore.h>#include <asm/param.h>#include <asm/sclp.h>#include <asm/smp.h>
unsigned long __read_mostly elf_hwcap;char elf_platform[ELF_PLATFORM_SIZE];
struct cpu_info { unsigned int cpu_mhz_dynamic; unsigned int cpu_mhz_static; struct cpuid cpu_id;};
static DEFINE_PER_CPU(struct cpu_info, cpu_info);static DEFINE_PER_CPU(int, cpu_relax_retry);
static bool machine_has_cpu_mhz;
void __init cpu_detect_mhz_feature(void){ if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL) machine_has_cpu_mhz = true;}
static void update_cpu_mhz(void *arg){ unsigned long mhz; struct cpu_info *c;
mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0); c = this_cpu_ptr(&cpu_info); c->cpu_mhz_dynamic = mhz >> 32; c->cpu_mhz_static = mhz & 0xffffffff;}
void s390_update_cpu_mhz(void){ s390_adjust_jiffies(); if (machine_has_cpu_mhz) on_each_cpu(update_cpu_mhz, NULL, 0);}
void notrace stop_machine_yield(const struct cpumask *cpumask){ int cpu, this_cpu;
this_cpu = smp_processor_id(); if (__this_cpu_inc_return(cpu_relax_retry) >= spin_retry) { __this_cpu_write(cpu_relax_retry, 0); cpu = cpumask_next_wrap(this_cpu, cpumask); if (cpu >= nr_cpu_ids) return; if (arch_vcpu_is_preempted(cpu)) smp_yield_cpu(cpu); }}
static void do_sync_core(void *info){ sync_core();}
void text_poke_sync(void){ on_each_cpu(do_sync_core, NULL, 1);}
void text_poke_sync_lock(void){ cpus_read_lock(); text_poke_sync(); cpus_read_unlock();}
/* * cpu_init - initializes state that is per-CPU. */void cpu_init(void){ struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
get_cpu_id(id); if (machine_has_cpu_mhz) update_cpu_mhz(NULL); mmgrab(&init_mm); current->active_mm = &init_mm; BUG_ON(current->mm); enter_lazy_tlb(&init_mm, current);}
static void show_facilities(struct seq_file *m){ unsigned int bit;
seq_puts(m, "facilities :"); for_each_set_bit_inv(bit, (long *)&stfle_fac_list, MAX_FACILITY_BIT) seq_printf(m, " %d", bit); seq_putc(m, '\n');}
static void show_cpu_summary(struct seq_file *m, void *v){ static const char *hwcap_str[] = { [HWCAP_NR_ESAN3] = "esan3", [HWCAP_NR_ZARCH] = "zarch", [HWCAP_NR_STFLE] = "stfle", [HWCAP_NR_MSA] = "msa", [HWCAP_NR_LDISP] = "ldisp", [HWCAP_NR_EIMM] = "eimm", [HWCAP_NR_DFP] = "dfp", [HWCAP_NR_HPAGE] = "edat", [HWCAP_NR_ETF3EH] = "etf3eh", [HWCAP_NR_HIGH_GPRS] = "highgprs", [HWCAP_NR_TE] = "te", [HWCAP_NR_VXRS] = "vx", [HWCAP_NR_VXRS_BCD] = "vxd", [HWCAP_NR_VXRS_EXT] = "vxe", [HWCAP_NR_GS] = "gs", [HWCAP_NR_VXRS_EXT2] = "vxe2", [HWCAP_NR_VXRS_PDE] = "vxp", [HWCAP_NR_SORT] = "sort", [HWCAP_NR_DFLT] = "dflt", [HWCAP_NR_VXRS_PDE2] = "vxp2", [HWCAP_NR_NNPA] = "nnpa", [HWCAP_NR_PCI_MIO] = "pcimio", [HWCAP_NR_SIE] = "sie", }; int i, cpu;
BUILD_BUG_ON(ARRAY_SIZE(hwcap_str) != HWCAP_NR_MAX); seq_printf(m, "vendor_id : IBM/S390\n" "# processors : %i\n" "bogomips per cpu: %lu.%02lu\n", num_online_cpus(), loops_per_jiffy/(500000/HZ), (loops_per_jiffy/(5000/HZ))%100); seq_printf(m, "max thread id : %d\n", smp_cpu_mtid); seq_puts(m, "features\t: "); for (i = 0; i < ARRAY_SIZE(hwcap_str); i++) if (hwcap_str[i] && (elf_hwcap & (1UL << i))) seq_printf(m, "%s ", hwcap_str[i]); seq_puts(m, "\n"); show_facilities(m); show_cacheinfo(m); for_each_online_cpu(cpu) { struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
seq_printf(m, "processor %d: " "version = %02X, " "identification = %06X, " "machine = %04X\n", cpu, id->version, id->ident, id->machine); }}
static int __init setup_hwcaps(void){ /* instructions named N3, "backported" to esa-mode */ elf_hwcap |= HWCAP_ESAN3;
/* z/Architecture mode active */ elf_hwcap |= HWCAP_ZARCH;
/* store-facility-list-extended */ if (test_facility(7)) elf_hwcap |= HWCAP_STFLE;
/* message-security assist */ if (test_facility(17)) elf_hwcap |= HWCAP_MSA;
/* long-displacement */ if (test_facility(19)) elf_hwcap |= HWCAP_LDISP;
/* extended-immediate */ elf_hwcap |= HWCAP_EIMM;
/* extended-translation facility 3 enhancement */ if (test_facility(22) && test_facility(30)) elf_hwcap |= HWCAP_ETF3EH;
/* decimal floating point & perform floating point operation */ if (test_facility(42) && test_facility(44)) elf_hwcap |= HWCAP_DFP;
/* huge page support */ if (cpu_has_edat1()) elf_hwcap |= HWCAP_HPAGE;
/* 64-bit register support for 31-bit processes */ elf_hwcap |= HWCAP_HIGH_GPRS;
/* transactional execution */ if (machine_has_tx()) elf_hwcap |= HWCAP_TE;
/* vector */ if (test_facility(129)) { elf_hwcap |= HWCAP_VXRS; if (test_facility(134)) elf_hwcap |= HWCAP_VXRS_BCD; if (test_facility(135)) elf_hwcap |= HWCAP_VXRS_EXT; if (test_facility(148)) elf_hwcap |= HWCAP_VXRS_EXT2; if (test_facility(152)) elf_hwcap |= HWCAP_VXRS_PDE; if (test_facility(192)) elf_hwcap |= HWCAP_VXRS_PDE2; }
if (test_facility(150)) elf_hwcap |= HWCAP_SORT;
if (test_facility(151)) elf_hwcap |= HWCAP_DFLT;
if (test_facility(165)) elf_hwcap |= HWCAP_NNPA;
/* guarded storage */ if (cpu_has_gs()) elf_hwcap |= HWCAP_GS;
if (test_machine_feature(MFEATURE_PCI_MIO)) elf_hwcap |= HWCAP_PCI_MIO;
/* virtualization support */ if (sclp.has_sief2) elf_hwcap |= HWCAP_SIE;
return 0;}arch_initcall(setup_hwcaps);
static int __init setup_elf_platform(void){ struct cpuid cpu_id;
get_cpu_id(&cpu_id); add_device_randomness(&cpu_id, sizeof(cpu_id)); switch (cpu_id.machine) { default: /* Use "z10" as default. */ strscpy(elf_platform, "z10"); break; case 0x2817: case 0x2818: strscpy(elf_platform, "z196"); break; case 0x2827: case 0x2828: strscpy(elf_platform, "zEC12"); break; case 0x2964: case 0x2965: strscpy(elf_platform, "z13"); break; case 0x3906: case 0x3907: strscpy(elf_platform, "z14"); break; case 0x8561: case 0x8562: strscpy(elf_platform, "z15"); break; case 0x3931: case 0x3932: strscpy(elf_platform, "z16"); break; case 0x9175: case 0x9176: strscpy(elf_platform, "z17"); break; } return 0;}arch_initcall(setup_elf_platform);
static void show_cpu_topology(struct seq_file *m, unsigned long n){#ifdef CONFIG_SCHED_TOPOLOGY seq_printf(m, "physical id : %d\n", topology_physical_package_id(n)); seq_printf(m, "core id : %d\n", topology_core_id(n)); seq_printf(m, "book id : %d\n", topology_book_id(n)); seq_printf(m, "drawer id : %d\n", topology_drawer_id(n)); seq_printf(m, "dedicated : %d\n", topology_cpu_dedicated(n)); seq_printf(m, "address : %d\n", smp_cpu_get_cpu_address(n)); seq_printf(m, "siblings : %d\n", cpumask_weight(topology_core_cpumask(n))); seq_printf(m, "cpu cores : %d\n", topology_booted_cores(n));#endif /* CONFIG_SCHED_TOPOLOGY */}
static void show_cpu_ids(struct seq_file *m, unsigned long n){ struct cpuid *id = &per_cpu(cpu_info.cpu_id, n);
seq_printf(m, "version : %02X\n", id->version); seq_printf(m, "identification : %06X\n", id->ident); seq_printf(m, "machine : %04X\n", id->machine);}
static void show_cpu_mhz(struct seq_file *m, unsigned long n){ struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
if (!machine_has_cpu_mhz) return; seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic); seq_printf(m, "cpu MHz static : %d\n", c->cpu_mhz_static);}
/* * show_cpuinfo - Get information on one CPU for use by procfs. */static int show_cpuinfo(struct seq_file *m, void *v){ unsigned long n = (unsigned long) v - 1; unsigned long first = cpumask_first(cpu_online_mask);
if (n == first) show_cpu_summary(m, v); seq_printf(m, "\ncpu number : %ld\n", n); show_cpu_topology(m, n); show_cpu_ids(m, n); show_cpu_mhz(m, n); return 0;}
static inline void *c_update(loff_t *pos){ if (*pos) *pos = cpumask_next(*pos - 1, cpu_online_mask); else *pos = cpumask_first(cpu_online_mask); return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;}
static void *c_start(struct seq_file *m, loff_t *pos){ cpus_read_lock(); return c_update(pos);}
static void *c_next(struct seq_file *m, void *v, loff_t *pos){ ++*pos; return c_update(pos);}
static void c_stop(struct seq_file *m, void *v){ cpus_read_unlock();}
const struct seq_operations cpuinfo_op = { .start = c_start, .next = c_next, .stop = c_stop, .show = show_cpuinfo,};