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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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0a5f9b382c
Rework cpufeature implementation to allow for various cpu feature indications, which is not only limited to hwcap bits. This is achieved by adding a sequential list of cpu feature numbers, where each of them is mapped to an entry which indicates what this number is about. Each entry contains a type member, which indicates what feature name space to look into (e.g. hwcap, or cpu facility). If wanted this allows also to automatically load modules only in e.g. z/VM configurations. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Link: https://lore.kernel.org/r/20220713125644.16121-2-seiden@linux.ibm.com Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
385 lines
8.9 KiB
C
385 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2008
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#define KMSG_COMPONENT "cpu"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/stop_machine.h>
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#include <linux/bitops.h>
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#include <linux/kernel.h>
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#include <linux/random.h>
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#include <linux/sched/mm.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/mm_types.h>
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#include <linux/delay.h>
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#include <linux/cpu.h>
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#include <asm/diag.h>
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#include <asm/facility.h>
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#include <asm/elf.h>
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#include <asm/lowcore.h>
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#include <asm/param.h>
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#include <asm/sclp.h>
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#include <asm/smp.h>
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unsigned long __read_mostly elf_hwcap;
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char elf_platform[ELF_PLATFORM_SIZE];
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struct cpu_info {
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unsigned int cpu_mhz_dynamic;
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unsigned int cpu_mhz_static;
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struct cpuid cpu_id;
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};
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static DEFINE_PER_CPU(struct cpu_info, cpu_info);
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static DEFINE_PER_CPU(int, cpu_relax_retry);
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static bool machine_has_cpu_mhz;
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void __init cpu_detect_mhz_feature(void)
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{
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if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL)
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machine_has_cpu_mhz = true;
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}
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static void update_cpu_mhz(void *arg)
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{
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unsigned long mhz;
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struct cpu_info *c;
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mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0);
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c = this_cpu_ptr(&cpu_info);
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c->cpu_mhz_dynamic = mhz >> 32;
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c->cpu_mhz_static = mhz & 0xffffffff;
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}
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void s390_update_cpu_mhz(void)
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{
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s390_adjust_jiffies();
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if (machine_has_cpu_mhz)
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on_each_cpu(update_cpu_mhz, NULL, 0);
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}
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void notrace stop_machine_yield(const struct cpumask *cpumask)
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{
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int cpu, this_cpu;
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this_cpu = smp_processor_id();
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if (__this_cpu_inc_return(cpu_relax_retry) >= spin_retry) {
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__this_cpu_write(cpu_relax_retry, 0);
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cpu = cpumask_next_wrap(this_cpu, cpumask, this_cpu, false);
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if (cpu >= nr_cpu_ids)
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return;
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if (arch_vcpu_is_preempted(cpu))
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smp_yield_cpu(cpu);
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}
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}
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/*
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* cpu_init - initializes state that is per-CPU.
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*/
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void cpu_init(void)
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{
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struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
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get_cpu_id(id);
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if (machine_has_cpu_mhz)
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update_cpu_mhz(NULL);
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mmgrab(&init_mm);
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current->active_mm = &init_mm;
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BUG_ON(current->mm);
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enter_lazy_tlb(&init_mm, current);
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}
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static void show_facilities(struct seq_file *m)
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{
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unsigned int bit;
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seq_puts(m, "facilities :");
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for_each_set_bit_inv(bit, (long *)&stfle_fac_list, MAX_FACILITY_BIT)
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seq_printf(m, " %d", bit);
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seq_putc(m, '\n');
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}
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static void show_cpu_summary(struct seq_file *m, void *v)
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{
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static const char *hwcap_str[] = {
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[HWCAP_NR_ESAN3] = "esan3",
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[HWCAP_NR_ZARCH] = "zarch",
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[HWCAP_NR_STFLE] = "stfle",
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[HWCAP_NR_MSA] = "msa",
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[HWCAP_NR_LDISP] = "ldisp",
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[HWCAP_NR_EIMM] = "eimm",
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[HWCAP_NR_DFP] = "dfp",
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[HWCAP_NR_HPAGE] = "edat",
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[HWCAP_NR_ETF3EH] = "etf3eh",
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[HWCAP_NR_HIGH_GPRS] = "highgprs",
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[HWCAP_NR_TE] = "te",
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[HWCAP_NR_VXRS] = "vx",
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[HWCAP_NR_VXRS_BCD] = "vxd",
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[HWCAP_NR_VXRS_EXT] = "vxe",
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[HWCAP_NR_GS] = "gs",
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[HWCAP_NR_VXRS_EXT2] = "vxe2",
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[HWCAP_NR_VXRS_PDE] = "vxp",
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[HWCAP_NR_SORT] = "sort",
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[HWCAP_NR_DFLT] = "dflt",
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[HWCAP_NR_VXRS_PDE2] = "vxp2",
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[HWCAP_NR_NNPA] = "nnpa",
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[HWCAP_NR_PCI_MIO] = "pcimio",
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[HWCAP_NR_SIE] = "sie",
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};
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int i, cpu;
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BUILD_BUG_ON(ARRAY_SIZE(hwcap_str) != HWCAP_NR_MAX);
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seq_printf(m, "vendor_id : IBM/S390\n"
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"# processors : %i\n"
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"bogomips per cpu: %lu.%02lu\n",
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num_online_cpus(), loops_per_jiffy/(500000/HZ),
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(loops_per_jiffy/(5000/HZ))%100);
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seq_printf(m, "max thread id : %d\n", smp_cpu_mtid);
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seq_puts(m, "features\t: ");
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for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
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if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
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seq_printf(m, "%s ", hwcap_str[i]);
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seq_puts(m, "\n");
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show_facilities(m);
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show_cacheinfo(m);
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for_each_online_cpu(cpu) {
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struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
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seq_printf(m, "processor %d: "
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"version = %02X, "
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"identification = %06X, "
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"machine = %04X\n",
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cpu, id->version, id->ident, id->machine);
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}
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}
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static int __init setup_hwcaps(void)
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{
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/* instructions named N3, "backported" to esa-mode */
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elf_hwcap |= HWCAP_ESAN3;
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/* z/Architecture mode active */
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elf_hwcap |= HWCAP_ZARCH;
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/* store-facility-list-extended */
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if (test_facility(7))
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elf_hwcap |= HWCAP_STFLE;
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/* message-security assist */
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if (test_facility(17))
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elf_hwcap |= HWCAP_MSA;
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/* long-displacement */
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if (test_facility(19))
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elf_hwcap |= HWCAP_LDISP;
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/* extended-immediate */
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elf_hwcap |= HWCAP_EIMM;
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/* extended-translation facility 3 enhancement */
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if (test_facility(22) && test_facility(30))
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elf_hwcap |= HWCAP_ETF3EH;
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/* decimal floating point & perform floating point operation */
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if (test_facility(42) && test_facility(44))
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elf_hwcap |= HWCAP_DFP;
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/* huge page support */
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if (MACHINE_HAS_EDAT1)
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elf_hwcap |= HWCAP_HPAGE;
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/* 64-bit register support for 31-bit processes */
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elf_hwcap |= HWCAP_HIGH_GPRS;
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/* transactional execution */
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if (MACHINE_HAS_TE)
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elf_hwcap |= HWCAP_TE;
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/*
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* Vector extension can be disabled with the "novx" parameter.
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* Use MACHINE_HAS_VX instead of facility bit 129.
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*/
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if (MACHINE_HAS_VX) {
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elf_hwcap |= HWCAP_VXRS;
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if (test_facility(134))
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elf_hwcap |= HWCAP_VXRS_BCD;
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if (test_facility(135))
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elf_hwcap |= HWCAP_VXRS_EXT;
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if (test_facility(148))
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elf_hwcap |= HWCAP_VXRS_EXT2;
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if (test_facility(152))
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elf_hwcap |= HWCAP_VXRS_PDE;
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if (test_facility(192))
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elf_hwcap |= HWCAP_VXRS_PDE2;
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}
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if (test_facility(150))
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elf_hwcap |= HWCAP_SORT;
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if (test_facility(151))
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elf_hwcap |= HWCAP_DFLT;
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if (test_facility(165))
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elf_hwcap |= HWCAP_NNPA;
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/* guarded storage */
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if (MACHINE_HAS_GS)
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elf_hwcap |= HWCAP_GS;
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if (MACHINE_HAS_PCI_MIO)
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elf_hwcap |= HWCAP_PCI_MIO;
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/* virtualization support */
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if (sclp.has_sief2)
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elf_hwcap |= HWCAP_SIE;
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return 0;
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}
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arch_initcall(setup_hwcaps);
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static int __init setup_elf_platform(void)
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{
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struct cpuid cpu_id;
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get_cpu_id(&cpu_id);
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add_device_randomness(&cpu_id, sizeof(cpu_id));
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switch (cpu_id.machine) {
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default: /* Use "z10" as default. */
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strcpy(elf_platform, "z10");
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break;
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case 0x2817:
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case 0x2818:
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strcpy(elf_platform, "z196");
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break;
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case 0x2827:
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case 0x2828:
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strcpy(elf_platform, "zEC12");
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break;
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case 0x2964:
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case 0x2965:
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strcpy(elf_platform, "z13");
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break;
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case 0x3906:
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case 0x3907:
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strcpy(elf_platform, "z14");
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break;
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case 0x8561:
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case 0x8562:
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strcpy(elf_platform, "z15");
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break;
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case 0x3931:
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case 0x3932:
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strcpy(elf_platform, "z16");
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break;
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}
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return 0;
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}
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arch_initcall(setup_elf_platform);
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static void show_cpu_topology(struct seq_file *m, unsigned long n)
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{
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#ifdef CONFIG_SCHED_TOPOLOGY
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seq_printf(m, "physical id : %d\n", topology_physical_package_id(n));
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seq_printf(m, "core id : %d\n", topology_core_id(n));
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seq_printf(m, "book id : %d\n", topology_book_id(n));
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seq_printf(m, "drawer id : %d\n", topology_drawer_id(n));
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seq_printf(m, "dedicated : %d\n", topology_cpu_dedicated(n));
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seq_printf(m, "address : %d\n", smp_cpu_get_cpu_address(n));
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seq_printf(m, "siblings : %d\n", cpumask_weight(topology_core_cpumask(n)));
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seq_printf(m, "cpu cores : %d\n", topology_booted_cores(n));
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#endif /* CONFIG_SCHED_TOPOLOGY */
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}
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static void show_cpu_ids(struct seq_file *m, unsigned long n)
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{
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struct cpuid *id = &per_cpu(cpu_info.cpu_id, n);
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seq_printf(m, "version : %02X\n", id->version);
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seq_printf(m, "identification : %06X\n", id->ident);
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seq_printf(m, "machine : %04X\n", id->machine);
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}
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static void show_cpu_mhz(struct seq_file *m, unsigned long n)
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{
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struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
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if (!machine_has_cpu_mhz)
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return;
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seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
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seq_printf(m, "cpu MHz static : %d\n", c->cpu_mhz_static);
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}
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/*
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* show_cpuinfo - Get information on one CPU for use by procfs.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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unsigned long n = (unsigned long) v - 1;
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unsigned long first = cpumask_first(cpu_online_mask);
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if (n == first)
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show_cpu_summary(m, v);
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seq_printf(m, "\ncpu number : %ld\n", n);
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show_cpu_topology(m, n);
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show_cpu_ids(m, n);
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show_cpu_mhz(m, n);
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return 0;
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}
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static inline void *c_update(loff_t *pos)
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{
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if (*pos)
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*pos = cpumask_next(*pos - 1, cpu_online_mask);
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else
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*pos = cpumask_first(cpu_online_mask);
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return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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cpus_read_lock();
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return c_update(pos);
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_update(pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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cpus_read_unlock();
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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int s390_isolate_bp(void)
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{
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if (!test_facility(82))
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return -EOPNOTSUPP;
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set_thread_flag(TIF_ISOLATE_BP);
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return 0;
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}
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EXPORT_SYMBOL(s390_isolate_bp);
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int s390_isolate_bp_guest(void)
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{
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if (!test_facility(82))
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return -EOPNOTSUPP;
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set_thread_flag(TIF_ISOLATE_BP_GUEST);
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return 0;
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}
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EXPORT_SYMBOL(s390_isolate_bp_guest);
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