[mirror_ubuntu-eoan-kernel.git] / arch / s390 / kernel / processor.c

/*
 *  Copyright IBM Corp. 2008
 *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#define KMSG_COMPONENT "cpu"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <asm/elf.h>
#include <asm/lowcore.h>
#include <asm/param.h>
#include <asm/smp.h>

static DEFINE_PER_CPU(struct cpuid, cpu_id);

void notrace cpu_relax(void)
{
	if (!smp_cpu_mtid && MACHINE_HAS_DIAG44)
		asm volatile("diag 0,0,0x44");
	barrier();
}
EXPORT_SYMBOL(cpu_relax);

/*
 * cpu_init - initializes state that is per-CPU.
 */
void cpu_init(void)
{
	struct cpuid *id = this_cpu_ptr(&cpu_id);

	get_cpu_id(id);
	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;
	BUG_ON(current->mm);
	enter_lazy_tlb(&init_mm, current);
}

/*
 * cpu_have_feature - Test CPU features on module initialization
 */
int cpu_have_feature(unsigned int num)
{
	return elf_hwcap & (1UL << num);
}
EXPORT_SYMBOL(cpu_have_feature);

/*
 * show_cpuinfo - Get information on one CPU for use by procfs.
 */
static int show_cpuinfo(struct seq_file *m, void *v)
{
	static const char *hwcap_str[] = {
		"esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
		"edat", "etf3eh", "highgprs", "te", "vx"
	};
	unsigned long n = (unsigned long) v - 1;
	int i;

	if (!n) {
		s390_adjust_jiffies();
		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_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_cacheinfo(m);
	}
	get_online_cpus();
	if (cpu_online(n)) {
		struct cpuid *id = &per_cpu(cpu_id, n);
		seq_printf(m, "processor %li: "
			   "version = %02X,  "
			   "identification = %06X,  "
			   "machine = %04X\n",
			   n, id->version, id->ident, id->machine);
	}
	put_online_cpus();
	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= show_cpuinfo,
};
Commit	Line	Data
395d31d4	1	/*
395d31d4 MS	2	* Copyright IBM Corp. 2008
	3	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
	4	*/
	5
	6	#define KMSG_COMPONENT "cpu"
	7	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	8
	9	#include <linux/kernel.h>
	10	#include <linux/init.h>
395d31d4 MS	11	#include <linux/seq_file.h>
395d31d4 MS	12	#include <linux/delay.h>
19726cec	13	#include <linux/cpu.h>
395d31d4 MS	14	#include <asm/elf.h>
	15	#include <asm/lowcore.h>
	16	#include <asm/param.h>
4d92f502	17	#include <asm/smp.h>
395d31d4	18
94038a99 MS	19	static DEFINE_PER_CPU(struct cpuid, cpu_id);
94038a99 MS	20
a9ca8eb7	21	void notrace cpu_relax(void)
4d92f502 HC	22	{
	23	if (!smp_cpu_mtid && MACHINE_HAS_DIAG44)
	24	asm volatile("diag 0,0,0x44");
	25	barrier();
	26	}
	27	EXPORT_SYMBOL(cpu_relax);
	28
94038a99 MS	29	/*
	30	* cpu_init - initializes state that is per-CPU.
	31	*/
e2741f17	32	void cpu_init(void)
94038a99	33	{
eb7e7d76	34	struct cpuid *id = this_cpu_ptr(&cpu_id);
94038a99 MS	35
	36	get_cpu_id(id);
	37	atomic_inc(&init_mm.mm_count);
	38	current->active_mm = &init_mm;
	39	BUG_ON(current->mm);
	40	enter_lazy_tlb(&init_mm, current);
	41	}
	42
8f00b3e2 HB	43	/*
	44	* cpu_have_feature - Test CPU features on module initialization
	45	*/
	46	int cpu_have_feature(unsigned int num)
	47	{
	48	return elf_hwcap & (1UL << num);
	49	}
	50	EXPORT_SYMBOL(cpu_have_feature);
	51
395d31d4 MS	52	/*
	53	* show_cpuinfo - Get information on one CPU for use by procfs.
	54	*/
395d31d4 MS	55	static int show_cpuinfo(struct seq_file m, void v)
395d31d4 MS	56	{
fbf3c542	57	static const char *hwcap_str[] = {
395d31d4	58	"esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
80703617	59	"edat", "etf3eh", "highgprs", "te", "vx"
395d31d4	60	};
7b468488 MS	61	unsigned long n = (unsigned long) v - 1;
7b468488 MS	62	int i;
395d31d4	63
7b468488	64	if (!n) {
8e102301	65	s390_adjust_jiffies();
7b468488 MS	66	seq_printf(m, "vendor_id : IBM/S390\n"
	67	"# processors : %i\n"
	68	"bogomips per cpu: %lu.%02lu\n",
	69	num_online_cpus(), loops_per_jiffy/(500000/HZ),
	70	(loops_per_jiffy/(5000/HZ))%100);
	71	seq_puts(m, "features\t: ");
fbf3c542	72	for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
7b468488 MS	73	if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
	74	seq_printf(m, "%s ", hwcap_str[i]);
	75	seq_puts(m, "\n");
6668022c	76	show_cacheinfo(m);
7b468488	77	}
19726cec	78	get_online_cpus();
7b468488	79	if (cpu_online(n)) {
94038a99	80	struct cpuid *id = &per_cpu(cpu_id, n);
7b468488 MS	81	seq_printf(m, "processor %li: "
	82	"version = %02X, "
	83	"identification = %06X, "
	84	"machine = %04X\n",
94038a99	85	n, id->version, id->ident, id->machine);
7b468488	86	}
19726cec	87	put_online_cpus();
7b468488	88	return 0;
395d31d4 MS	89	}
	90
	91	static void c_start(struct seq_file m, loff_t *pos)
	92	{
dd4a5a31	93	return pos < nr_cpu_ids ? (void )((unsigned long) *pos + 1) : NULL;
395d31d4 MS	94	}
	95
	96	static void c_next(struct seq_file m, void v, loff_t pos)
	97	{
	98	++*pos;
	99	return c_start(m, pos);
	100	}
	101
	102	static void c_stop(struct seq_file m, void v)
	103	{
	104	}
	105
	106	const struct seq_operations cpuinfo_op = {
	107	.start = c_start,
	108	.next = c_next,
	109	.stop = c_stop,
	110	.show = show_cpuinfo,
	111	};
	112