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24dbc6000f
Currently, x86_cache_size is of type int, which makes no sense as we will never have a valid cache size equal or less than 0. So instead of initializing this variable to -1, it can perfectly be initialized to 0 and use it as an unsigned variable instead. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Addresses-Coverity-ID: 1464429 Link: http://lkml.kernel.org/r/20180213192208.GA26414@embeddedor.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/smp.h>
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#include <linux/timex.h>
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#include <linux/string.h>
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#include <linux/seq_file.h>
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#include <linux/cpufreq.h>
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#include "cpu.h"
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/*
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* Get CPU information for use by the procfs.
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*/
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static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
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unsigned int cpu)
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{
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#ifdef CONFIG_SMP
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seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
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seq_printf(m, "siblings\t: %d\n",
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cpumask_weight(topology_core_cpumask(cpu)));
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seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
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seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
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seq_printf(m, "apicid\t\t: %d\n", c->apicid);
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seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
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#endif
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}
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#ifdef CONFIG_X86_32
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static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
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{
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seq_printf(m,
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"fdiv_bug\t: %s\n"
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"f00f_bug\t: %s\n"
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"coma_bug\t: %s\n"
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"fpu\t\t: %s\n"
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"fpu_exception\t: %s\n"
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"cpuid level\t: %d\n"
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"wp\t\t: yes\n",
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static_cpu_has_bug(X86_BUG_FDIV) ? "yes" : "no",
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static_cpu_has_bug(X86_BUG_F00F) ? "yes" : "no",
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static_cpu_has_bug(X86_BUG_COMA) ? "yes" : "no",
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static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
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static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
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c->cpuid_level);
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}
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#else
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static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
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{
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seq_printf(m,
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"fpu\t\t: yes\n"
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"fpu_exception\t: yes\n"
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"cpuid level\t: %d\n"
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"wp\t\t: yes\n",
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c->cpuid_level);
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}
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#endif
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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struct cpuinfo_x86 *c = v;
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unsigned int cpu;
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int i;
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cpu = c->cpu_index;
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seq_printf(m, "processor\t: %u\n"
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"vendor_id\t: %s\n"
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"cpu family\t: %d\n"
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"model\t\t: %u\n"
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"model name\t: %s\n",
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cpu,
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c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
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c->x86,
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c->x86_model,
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c->x86_model_id[0] ? c->x86_model_id : "unknown");
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if (c->x86_stepping || c->cpuid_level >= 0)
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seq_printf(m, "stepping\t: %d\n", c->x86_stepping);
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else
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seq_puts(m, "stepping\t: unknown\n");
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if (c->microcode)
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seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
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if (cpu_has(c, X86_FEATURE_TSC)) {
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unsigned int freq = aperfmperf_get_khz(cpu);
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if (!freq)
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freq = cpufreq_quick_get(cpu);
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if (!freq)
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freq = cpu_khz;
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seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
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freq / 1000, (freq % 1000));
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}
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/* Cache size */
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if (c->x86_cache_size)
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seq_printf(m, "cache size\t: %u KB\n", c->x86_cache_size);
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show_cpuinfo_core(m, c, cpu);
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show_cpuinfo_misc(m, c);
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seq_puts(m, "flags\t\t:");
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for (i = 0; i < 32*NCAPINTS; i++)
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if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
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seq_printf(m, " %s", x86_cap_flags[i]);
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seq_puts(m, "\nbugs\t\t:");
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for (i = 0; i < 32*NBUGINTS; i++) {
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unsigned int bug_bit = 32*NCAPINTS + i;
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if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
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seq_printf(m, " %s", x86_bug_flags[i]);
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}
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seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
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c->loops_per_jiffy/(500000/HZ),
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(c->loops_per_jiffy/(5000/HZ)) % 100);
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#ifdef CONFIG_X86_64
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if (c->x86_tlbsize > 0)
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seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
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#endif
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seq_printf(m, "clflush size\t: %u\n", c->x86_clflush_size);
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seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
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seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
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c->x86_phys_bits, c->x86_virt_bits);
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seq_puts(m, "power management:");
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for (i = 0; i < 32; i++) {
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if (c->x86_power & (1 << i)) {
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if (i < ARRAY_SIZE(x86_power_flags) &&
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x86_power_flags[i])
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seq_printf(m, "%s%s",
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x86_power_flags[i][0] ? " " : "",
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x86_power_flags[i]);
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else
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seq_printf(m, " [%d]", i);
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}
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}
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seq_puts(m, "\n\n");
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return 0;
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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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*pos = cpumask_next(*pos - 1, cpu_online_mask);
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if ((*pos) < nr_cpu_ids)
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return &cpu_data(*pos);
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return NULL;
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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_start(m, 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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}
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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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