[linux-block.git] / arch / s390 / kernel / sysinfo.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright IBM Corp. 2001, 2009
 *  Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
 *	       Martin Schwidefsky <schwidefsky@de.ibm.com>,
 */

#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <asm/asm-extable.h>
#include <asm/ebcdic.h>
#include <asm/debug.h>
#include <asm/sysinfo.h>
#include <asm/cpcmd.h>
#include <asm/topology.h>
#include <asm/fpu/api.h>

int topology_max_mnest;

static inline int __stsi(void *sysinfo, int fc, int sel1, int sel2, int *lvl)
{
	int r0 = (fc << 28) | sel1;
	int rc = 0;

	asm volatile(
		"	lr	0,%[r0]\n"
		"	lr	1,%[r1]\n"
		"	stsi	0(%[sysinfo])\n"
		"0:	jz	2f\n"
		"1:	lhi	%[rc],%[retval]\n"
		"2:	lr	%[r0],0\n"
		EX_TABLE(0b, 1b)
		: [r0] "+d" (r0), [rc] "+d" (rc)
		: [r1] "d" (sel2),
		  [sysinfo] "a" (sysinfo),
		  [retval] "K" (-EOPNOTSUPP)
		: "cc", "0", "1", "memory");
	*lvl = ((unsigned int) r0) >> 28;
	return rc;
}

/*
 * stsi - store system information
 *
 * Returns the current configuration level if function code 0 was specified.
 * Otherwise returns 0 on success or a negative value on error.
 */
int stsi(void *sysinfo, int fc, int sel1, int sel2)
{
	int lvl, rc;

	rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
	if (rc)
		return rc;
	return fc ? 0 : lvl;
}
EXPORT_SYMBOL(stsi);

#ifdef CONFIG_PROC_FS

static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
{
	switch (encoding) {
	case 1: /* EBCDIC */
		EBCASC(name, len);
		break;
	case 2:	/* UTF-8 */
		break;
	default:
		return false;
	}
	return true;
}

static void stsi_1_1_1(struct seq_file *m, struct sysinfo_1_1_1 *info)
{
	int i;

	if (stsi(info, 1, 1, 1))
		return;
	EBCASC(info->manufacturer, sizeof(info->manufacturer));
	EBCASC(info->type, sizeof(info->type));
	EBCASC(info->model, sizeof(info->model));
	EBCASC(info->sequence, sizeof(info->sequence));
	EBCASC(info->plant, sizeof(info->plant));
	EBCASC(info->model_capacity, sizeof(info->model_capacity));
	EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
	EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
	seq_printf(m, "Manufacturer:         %-16.16s\n", info->manufacturer);
	seq_printf(m, "Type:                 %-4.4s\n", info->type);
	if (info->lic)
		seq_printf(m, "LIC Identifier:       %016lx\n", info->lic);
	/*
	 * Sigh: the model field has been renamed with System z9
	 * to model_capacity and a new model field has been added
	 * after the plant field. To avoid confusing older programs
	 * the "Model:" prints "model_capacity model" or just
	 * "model_capacity" if the model string is empty .
	 */
	seq_printf(m, "Model:                %-16.16s", info->model_capacity);
	if (info->model[0] != '\0')
		seq_printf(m, " %-16.16s", info->model);
	seq_putc(m, '\n');
	seq_printf(m, "Sequence Code:        %-16.16s\n", info->sequence);
	seq_printf(m, "Plant:                %-4.4s\n", info->plant);
	seq_printf(m, "Model Capacity:       %-16.16s %08u\n",
		   info->model_capacity, info->model_cap_rating);
	if (info->model_perm_cap_rating)
		seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
			   info->model_perm_cap,
			   info->model_perm_cap_rating);
	if (info->model_temp_cap_rating)
		seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
			   info->model_temp_cap,
			   info->model_temp_cap_rating);
	if (info->ncr)
		seq_printf(m, "Nominal Cap. Rating:  %08u\n", info->ncr);
	if (info->npr)
		seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
	if (info->ntr)
		seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
	if (info->cai) {
		seq_printf(m, "Capacity Adj. Ind.:   %d\n", info->cai);
		seq_printf(m, "Capacity Ch. Reason:  %d\n", info->ccr);
		seq_printf(m, "Capacity Transient:   %d\n", info->t);
	}
	if (info->p) {
		for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
			seq_printf(m, "Type %d Percentage:    %d\n",
				   i, info->typepct[i - 1]);
		}
	}
}

static void stsi_15_1_x(struct seq_file *m, struct sysinfo_15_1_x *info)
{
	int i;

	seq_putc(m, '\n');
	if (!MACHINE_HAS_TOPOLOGY)
		return;
	if (stsi(info, 15, 1, topology_max_mnest))
		return;
	seq_printf(m, "CPU Topology HW:     ");
	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
		seq_printf(m, " %d", info->mag[i]);
	seq_putc(m, '\n');
#ifdef CONFIG_SCHED_TOPOLOGY
	store_topology(info);
	seq_printf(m, "CPU Topology SW:     ");
	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
		seq_printf(m, " %d", info->mag[i]);
	seq_putc(m, '\n');
#endif
}

static void stsi_1_2_2(struct seq_file *m, struct sysinfo_1_2_2 *info)
{
	struct sysinfo_1_2_2_extension *ext;
	int i;

	if (stsi(info, 1, 2, 2))
		return;
	ext = (struct sysinfo_1_2_2_extension *)
		((unsigned long) info + info->acc_offset);
	seq_printf(m, "CPUs Total:           %d\n", info->cpus_total);
	seq_printf(m, "CPUs Configured:      %d\n", info->cpus_configured);
	seq_printf(m, "CPUs Standby:         %d\n", info->cpus_standby);
	seq_printf(m, "CPUs Reserved:        %d\n", info->cpus_reserved);
	if (info->mt_installed) {
		seq_printf(m, "CPUs G-MTID:          %d\n", info->mt_gtid);
		seq_printf(m, "CPUs S-MTID:          %d\n", info->mt_stid);
	}
	/*
	 * Sigh 2. According to the specification the alternate
	 * capability field is a 32 bit floating point number
	 * if the higher order 8 bits are not zero. Printing
	 * a floating point number in the kernel is a no-no,
	 * always print the number as 32 bit unsigned integer.
	 * The user-space needs to know about the strange
	 * encoding of the alternate cpu capability.
	 */
	seq_printf(m, "Capability:           %u", info->capability);
	if (info->format == 1)
		seq_printf(m, " %u", ext->alt_capability);
	seq_putc(m, '\n');
	if (info->nominal_cap)
		seq_printf(m, "Nominal Capability:   %d\n", info->nominal_cap);
	if (info->secondary_cap)
		seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
	for (i = 2; i <= info->cpus_total; i++) {
		seq_printf(m, "Adjustment %02d-way:    %u",
			   i, info->adjustment[i-2]);
		if (info->format == 1)
			seq_printf(m, " %u", ext->alt_adjustment[i-2]);
		seq_putc(m, '\n');
	}
}

static void stsi_2_2_2(struct seq_file *m, struct sysinfo_2_2_2 *info)
{
	if (stsi(info, 2, 2, 2))
		return;
	EBCASC(info->name, sizeof(info->name));
	seq_putc(m, '\n');
	seq_printf(m, "LPAR Number:          %d\n", info->lpar_number);
	seq_printf(m, "LPAR Characteristics: ");
	if (info->characteristics & LPAR_CHAR_DEDICATED)
		seq_printf(m, "Dedicated ");
	if (info->characteristics & LPAR_CHAR_SHARED)
		seq_printf(m, "Shared ");
	if (info->characteristics & LPAR_CHAR_LIMITED)
		seq_printf(m, "Limited ");
	seq_putc(m, '\n');
	seq_printf(m, "LPAR Name:            %-8.8s\n", info->name);
	seq_printf(m, "LPAR Adjustment:      %d\n", info->caf);
	seq_printf(m, "LPAR CPUs Total:      %d\n", info->cpus_total);
	seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
	seq_printf(m, "LPAR CPUs Standby:    %d\n", info->cpus_standby);
	seq_printf(m, "LPAR CPUs Reserved:   %d\n", info->cpus_reserved);
	seq_printf(m, "LPAR CPUs Dedicated:  %d\n", info->cpus_dedicated);
	seq_printf(m, "LPAR CPUs Shared:     %d\n", info->cpus_shared);
	if (info->mt_installed) {
		seq_printf(m, "LPAR CPUs G-MTID:     %d\n", info->mt_gtid);
		seq_printf(m, "LPAR CPUs S-MTID:     %d\n", info->mt_stid);
		seq_printf(m, "LPAR CPUs PS-MTID:    %d\n", info->mt_psmtid);
	}
	if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
		seq_printf(m, "LPAR Extended Name:   %-.256s\n", info->ext_name);
		seq_printf(m, "LPAR UUID:            %pUb\n", &info->uuid);
	}
}

static void print_ext_name(struct seq_file *m, int lvl,
			   struct sysinfo_3_2_2 *info)
{
	size_t len = sizeof(info->ext_names[lvl]);

	if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
		return;
	seq_printf(m, "VM%02d Extended Name:   %-.256s\n", lvl,
		   info->ext_names[lvl]);
}

static void print_uuid(struct seq_file *m, int i, struct sysinfo_3_2_2 *info)
{
	if (uuid_is_null(&info->vm[i].uuid))
		return;
	seq_printf(m, "VM%02d UUID:            %pUb\n", i, &info->vm[i].uuid);
}

static void stsi_3_2_2(struct seq_file *m, struct sysinfo_3_2_2 *info)
{
	int i;

	if (stsi(info, 3, 2, 2))
		return;
	for (i = 0; i < info->count; i++) {
		EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
		EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
		seq_putc(m, '\n');
		seq_printf(m, "VM%02d Name:            %-8.8s\n", i, info->vm[i].name);
		seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
		seq_printf(m, "VM%02d Adjustment:      %d\n", i, info->vm[i].caf);
		seq_printf(m, "VM%02d CPUs Total:      %d\n", i, info->vm[i].cpus_total);
		seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
		seq_printf(m, "VM%02d CPUs Standby:    %d\n", i, info->vm[i].cpus_standby);
		seq_printf(m, "VM%02d CPUs Reserved:   %d\n", i, info->vm[i].cpus_reserved);
		print_ext_name(m, i, info);
		print_uuid(m, i, info);
	}
}

static int sysinfo_show(struct seq_file *m, void *v)
{
	void *info = (void *)get_zeroed_page(GFP_KERNEL);
	int level;

	if (!info)
		return 0;
	level = stsi(NULL, 0, 0, 0);
	if (level >= 1)
		stsi_1_1_1(m, info);
	if (level >= 1)
		stsi_15_1_x(m, info);
	if (level >= 1)
		stsi_1_2_2(m, info);
	if (level >= 2)
		stsi_2_2_2(m, info);
	if (level >= 3)
		stsi_3_2_2(m, info);
	free_page((unsigned long)info);
	return 0;
}

static int __init sysinfo_create_proc(void)
{
	proc_create_single("sysinfo", 0444, NULL, sysinfo_show);
	return 0;
}
device_initcall(sysinfo_create_proc);

#endif /* CONFIG_PROC_FS */

/*
 * Service levels interface.
 */

static DECLARE_RWSEM(service_level_sem);
static LIST_HEAD(service_level_list);

int register_service_level(struct service_level *slr)
{
	struct service_level *ptr;

	down_write(&service_level_sem);
	list_for_each_entry(ptr, &service_level_list, list)
		if (ptr == slr) {
			up_write(&service_level_sem);
			return -EEXIST;
		}
	list_add_tail(&slr->list, &service_level_list);
	up_write(&service_level_sem);
	return 0;
}
EXPORT_SYMBOL(register_service_level);

int unregister_service_level(struct service_level *slr)
{
	struct service_level *ptr, *next;
	int rc = -ENOENT;

	down_write(&service_level_sem);
	list_for_each_entry_safe(ptr, next, &service_level_list, list) {
		if (ptr != slr)
			continue;
		list_del(&ptr->list);
		rc = 0;
		break;
	}
	up_write(&service_level_sem);
	return rc;
}
EXPORT_SYMBOL(unregister_service_level);

static void *service_level_start(struct seq_file *m, loff_t *pos)
{
	down_read(&service_level_sem);
	return seq_list_start(&service_level_list, *pos);
}

static void *service_level_next(struct seq_file *m, void *p, loff_t *pos)
{
	return seq_list_next(p, &service_level_list, pos);
}

static void service_level_stop(struct seq_file *m, void *p)
{
	up_read(&service_level_sem);
}

static int service_level_show(struct seq_file *m, void *p)
{
	struct service_level *slr;

	slr = list_entry(p, struct service_level, list);
	slr->seq_print(m, slr);
	return 0;
}

static const struct seq_operations service_level_seq_ops = {
	.start		= service_level_start,
	.next		= service_level_next,
	.stop		= service_level_stop,
	.show		= service_level_show
};

static void service_level_vm_print(struct seq_file *m,
				   struct service_level *slr)
{
	char *query_buffer, *str;

	query_buffer = kmalloc(1024, GFP_KERNEL | GFP_DMA);
	if (!query_buffer)
		return;
	cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
	str = strchr(query_buffer, '\n');
	if (str)
		*str = 0;
	seq_printf(m, "VM: %s\n", query_buffer);
	kfree(query_buffer);
}

static struct service_level service_level_vm = {
	.seq_print = service_level_vm_print
};

static __init int create_proc_service_level(void)
{
	proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops);
	if (MACHINE_IS_VM)
		register_service_level(&service_level_vm);
	return 0;
}
subsys_initcall(create_proc_service_level);

/*
 * CPU capability might have changed. Therefore recalculate loops_per_jiffy.
 */
void s390_adjust_jiffies(void)
{
	struct sysinfo_1_2_2 *info;
	unsigned long capability;
	struct kernel_fpu fpu;

	info = (void *) get_zeroed_page(GFP_KERNEL);
	if (!info)
		return;

	if (stsi(info, 1, 2, 2) == 0) {
		/*
		 * Major sigh. The cpu capability encoding is "special".
		 * If the first 9 bits of info->capability are 0 then it
		 * is a 32 bit unsigned integer in the range 0 .. 2^23.
		 * If the first 9 bits are != 0 then it is a 32 bit float.
		 * In addition a lower value indicates a proportionally
		 * higher cpu capacity. Bogomips are the other way round.
		 * To get to a halfway suitable number we divide 1e7
		 * by the cpu capability number. Yes, that means a floating
		 * point division ..
		 */
		kernel_fpu_begin(&fpu, KERNEL_FPR);
		asm volatile(
			"	sfpc	%3\n"
			"	l	%0,%1\n"
			"	tmlh	%0,0xff80\n"
			"	jnz	0f\n"
			"	cefbr	%%f2,%0\n"
			"	j	1f\n"
			"0:	le	%%f2,%1\n"
			"1:	cefbr	%%f0,%2\n"
			"	debr	%%f0,%%f2\n"
			"	cgebr	%0,5,%%f0\n"
			: "=&d" (capability)
			: "Q" (info->capability), "d" (10000000), "d" (0)
			: "cc"
			);
		kernel_fpu_end(&fpu, KERNEL_FPR);
	} else
		/*
		 * Really old machine without stsi block for basic
		 * cpu information. Report 42.0 bogomips.
		 */
		capability = 42;
	loops_per_jiffy = capability * (500000/HZ);
	free_page((unsigned long) info);
}

/*
 * calibrate the delay loop
 */
void calibrate_delay(void)
{
	s390_adjust_jiffies();
	/* Print the good old Bogomips line .. */
	printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
	       "%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
	       (loops_per_jiffy/(5000/HZ)) % 100);
}

#ifdef CONFIG_DEBUG_FS

#define STSI_FILE(fc, s1, s2)						       \
static int stsi_open_##fc##_##s1##_##s2(struct inode *inode, struct file *file)\
{									       \
	file->private_data = (void *) get_zeroed_page(GFP_KERNEL);	       \
	if (!file->private_data)					       \
		return -ENOMEM;						       \
	if (stsi(file->private_data, fc, s1, s2)) {			       \
		free_page((unsigned long)file->private_data);		       \
		file->private_data = NULL;				       \
		return -EACCES;						       \
	}								       \
	return nonseekable_open(inode, file);				       \
}									       \
									       \
static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = {       \
	.open		= stsi_open_##fc##_##s1##_##s2,			       \
	.release	= stsi_release,					       \
	.read		= stsi_read,					       \
	.llseek		= no_llseek,					       \
};

static int stsi_release(struct inode *inode, struct file *file)
{
	free_page((unsigned long)file->private_data);
	return 0;
}

static ssize_t stsi_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
{
	return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
}

STSI_FILE( 1, 1, 1);
STSI_FILE( 1, 2, 1);
STSI_FILE( 1, 2, 2);
STSI_FILE( 2, 2, 1);
STSI_FILE( 2, 2, 2);
STSI_FILE( 3, 2, 2);
STSI_FILE(15, 1, 2);
STSI_FILE(15, 1, 3);
STSI_FILE(15, 1, 4);
STSI_FILE(15, 1, 5);
STSI_FILE(15, 1, 6);

struct stsi_file {
	const struct file_operations *fops;
	char *name;
};

static struct stsi_file stsi_file[] __initdata = {
	{.fops = &stsi_1_1_1_fs_ops,  .name =  "1_1_1"},
	{.fops = &stsi_1_2_1_fs_ops,  .name =  "1_2_1"},
	{.fops = &stsi_1_2_2_fs_ops,  .name =  "1_2_2"},
	{.fops = &stsi_2_2_1_fs_ops,  .name =  "2_2_1"},
	{.fops = &stsi_2_2_2_fs_ops,  .name =  "2_2_2"},
	{.fops = &stsi_3_2_2_fs_ops,  .name =  "3_2_2"},
	{.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
	{.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
	{.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
	{.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
	{.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
};

static u8 stsi_0_0_0;

static __init int stsi_init_debugfs(void)
{
	struct dentry *stsi_root;
	struct stsi_file *sf;
	int lvl, i;

	stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
	lvl = stsi(NULL, 0, 0, 0);
	if (lvl > 0)
		stsi_0_0_0 = lvl;
	debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
	for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
		sf = &stsi_file[i];
		debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
	}
	if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
		char link_to[10];

		sprintf(link_to, "15_1_%d", topology_mnest_limit());
		debugfs_create_symlink("topology", stsi_root, link_to);
	}
	return 0;
}
device_initcall(stsi_init_debugfs);

#endif /* CONFIG_DEBUG_FS */
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
94f5b09d HC	3	* Copyright IBM Corp. 2001, 2009
	4	* Author(s): Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
	5	* Martin Schwidefsky <schwidefsky@de.ibm.com>,
1da177e4 LT	6	*/
1da177e4 LT	7
ae5ca67a	8	#include <linux/debugfs.h>
1da177e4 LT	9	#include <linux/kernel.h>
	10	#include <linux/mm.h>
	11	#include <linux/proc_fs.h>
6bcac508	12	#include <linux/seq_file.h>
1da177e4	13	#include <linux/init.h>
31ee4b2f	14	#include <linux/delay.h>
3994a52b	15	#include <linux/export.h>
5a0e3ad6	16	#include <linux/slab.h>
d09a307f	17	#include <asm/asm-extable.h>
1da177e4	18	#include <asm/ebcdic.h>
ae5ca67a	19	#include <asm/debug.h>
aa24f7f0	20	#include <asm/sysinfo.h>
6bcac508	21	#include <asm/cpcmd.h>
96f4a70d	22	#include <asm/topology.h>
9c203239	23	#include <asm/fpu/api.h>
31ee4b2f	24
fade4dc4 HC	25	int topology_max_mnest;
fade4dc4 HC	26
2c79813a	27	static inline int __stsi(void sysinfo, int fc, int sel1, int sel2, int lvl)
1da177e4	28	{
5fe29839	29	int r0 = (fc << 28) \| sel1;
caf757c6 HC	30	int rc = 0;
	31
	32	asm volatile(
5fe29839 HC	33	" lr 0,%[r0]\n"
	34	" lr 1,%[r1]\n"
	35	" stsi 0(%[sysinfo])\n"
caf757c6	36	"0: jz 2f\n"
5fe29839 HC	37	"1: lhi %[rc],%[retval]\n"
5fe29839 HC	38	"2: lr %[r0],0\n"
caf757c6	39	EX_TABLE(0b, 1b)
5fe29839 HC	40	: [r0] "+d" (r0), [rc] "+d" (rc)
	41	: [r1] "d" (sel2),
	42	[sysinfo] "a" (sysinfo),
	43	[retval] "K" (-EOPNOTSUPP)
	44	: "cc", "0", "1", "memory");
2c79813a HC	45	*lvl = ((unsigned int) r0) >> 28;
	46	return rc;
	47	}
	48
	49	/*
	50	* stsi - store system information
	51	*
	52	* Returns the current configuration level if function code 0 was specified.
	53	* Otherwise returns 0 on success or a negative value on error.
	54	*/
	55	int stsi(void *sysinfo, int fc, int sel1, int sel2)
	56	{
	57	int lvl, rc;
	58
	59	rc = __stsi(sysinfo, fc, sel1, sel2, &lvl);
caf757c6 HC	60	if (rc)
caf757c6 HC	61	return rc;
2c79813a	62	return fc ? 0 : lvl;
1da177e4	63	}
caf757c6	64	EXPORT_SYMBOL(stsi);
1da177e4	65
9f35b818 HC	66	#ifdef CONFIG_PROC_FS
9f35b818 HC	67
e32eae10 VM	68	static bool convert_ext_name(unsigned char encoding, char *name, size_t len)
	69	{
	70	switch (encoding) {
	71	case 1: /* EBCDIC */
	72	EBCASC(name, len);
	73	break;
	74	case 2: /* UTF-8 */
	75	break;
	76	default:
	77	return false;
	78	}
	79	return true;
	80	}
	81
0facaa17	82	static void stsi_1_1_1(struct seq_file m, struct sysinfo_1_1_1 info)
1da177e4	83	{
25502f00 HC	84	int i;
25502f00 HC	85
caf757c6	86	if (stsi(info, 1, 1, 1))
0facaa17	87	return;
0fee644a MS	88	EBCASC(info->manufacturer, sizeof(info->manufacturer));
	89	EBCASC(info->type, sizeof(info->type));
	90	EBCASC(info->model, sizeof(info->model));
	91	EBCASC(info->sequence, sizeof(info->sequence));
	92	EBCASC(info->plant, sizeof(info->plant));
	93	EBCASC(info->model_capacity, sizeof(info->model_capacity));
cbce70e6 MS	94	EBCASC(info->model_perm_cap, sizeof(info->model_perm_cap));
cbce70e6 MS	95	EBCASC(info->model_temp_cap, sizeof(info->model_temp_cap));
0facaa17 HC	96	seq_printf(m, "Manufacturer: %-16.16s\n", info->manufacturer);
0facaa17 HC	97	seq_printf(m, "Type: %-4.4s\n", info->type);
5260b0f5 HB	98	if (info->lic)
5260b0f5 HB	99	seq_printf(m, "LIC Identifier: %016lx\n", info->lic);
0facaa17 HC	100	/*
	101	* Sigh: the model field has been renamed with System z9
	102	* to model_capacity and a new model field has been added
	103	* after the plant field. To avoid confusing older programs
	104	* the "Model:" prints "model_capacity model" or just
	105	* "model_capacity" if the model string is empty .
	106	*/
	107	seq_printf(m, "Model: %-16.16s", info->model_capacity);
0fee644a	108	if (info->model[0] != '\0')
0facaa17 HC	109	seq_printf(m, " %-16.16s", info->model);
	110	seq_putc(m, '\n');
	111	seq_printf(m, "Sequence Code: %-16.16s\n", info->sequence);
	112	seq_printf(m, "Plant: %-4.4s\n", info->plant);
	113	seq_printf(m, "Model Capacity: %-16.16s %08u\n",
25502f00 HC	114	info->model_capacity, info->model_cap_rating);
25502f00 HC	115	if (info->model_perm_cap_rating)
0facaa17 HC	116	seq_printf(m, "Model Perm. Capacity: %-16.16s %08u\n",
0facaa17 HC	117	info->model_perm_cap,
25502f00 HC	118	info->model_perm_cap_rating);
25502f00 HC	119	if (info->model_temp_cap_rating)
0facaa17 HC	120	seq_printf(m, "Model Temp. Capacity: %-16.16s %08u\n",
0facaa17 HC	121	info->model_temp_cap,
25502f00 HC	122	info->model_temp_cap_rating);
	123	if (info->ncr)
	124	seq_printf(m, "Nominal Cap. Rating: %08u\n", info->ncr);
	125	if (info->npr)
	126	seq_printf(m, "Nominal Perm. Rating: %08u\n", info->npr);
	127	if (info->ntr)
	128	seq_printf(m, "Nominal Temp. Rating: %08u\n", info->ntr);
7aca2eda	129	if (info->cai) {
0facaa17 HC	130	seq_printf(m, "Capacity Adj. Ind.: %d\n", info->cai);
0facaa17 HC	131	seq_printf(m, "Capacity Ch. Reason: %d\n", info->ccr);
25502f00 HC	132	seq_printf(m, "Capacity Transient: %d\n", info->t);
	133	}
	134	if (info->p) {
	135	for (i = 1; i <= ARRAY_SIZE(info->typepct); i++) {
	136	seq_printf(m, "Type %d Percentage: %d\n",
	137	i, info->typepct[i - 1]);
	138	}
7aca2eda	139	}
1da177e4 LT	140	}
1da177e4 LT	141
0facaa17	142	static void stsi_15_1_x(struct seq_file m, struct sysinfo_15_1_x info)
96f4a70d	143	{
e527aec4	144	int i;
96f4a70d	145
0facaa17	146	seq_putc(m, '\n');
96f4a70d	147	if (!MACHINE_HAS_TOPOLOGY)
0facaa17	148	return;
caf757c6 HC	149	if (stsi(info, 15, 1, topology_max_mnest))
caf757c6 HC	150	return;
0facaa17	151	seq_printf(m, "CPU Topology HW: ");
96f4a70d	152	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
0facaa17 HC	153	seq_printf(m, " %d", info->mag[i]);
0facaa17 HC	154	seq_putc(m, '\n');
9236b4dd	155	#ifdef CONFIG_SCHED_TOPOLOGY
96f4a70d	156	store_topology(info);
0facaa17	157	seq_printf(m, "CPU Topology SW: ");
96f4a70d	158	for (i = 0; i < TOPOLOGY_NR_MAG; i++)
0facaa17 HC	159	seq_printf(m, " %d", info->mag[i]);
0facaa17 HC	160	seq_putc(m, '\n');
8d11e021	161	#endif
96f4a70d HC	162	}
96f4a70d HC	163
0facaa17	164	static void stsi_1_2_2(struct seq_file m, struct sysinfo_1_2_2 info)
1da177e4	165	{
0fee644a MS	166	struct sysinfo_1_2_2_extension *ext;
	167	int i;
	168
caf757c6	169	if (stsi(info, 1, 2, 2))
0facaa17	170	return;
0fee644a MS	171	ext = (struct sysinfo_1_2_2_extension *)
0fee644a MS	172	((unsigned long) info + info->acc_offset);
0facaa17 HC	173	seq_printf(m, "CPUs Total: %d\n", info->cpus_total);
	174	seq_printf(m, "CPUs Configured: %d\n", info->cpus_configured);
	175	seq_printf(m, "CPUs Standby: %d\n", info->cpus_standby);
	176	seq_printf(m, "CPUs Reserved: %d\n", info->cpus_reserved);
7022ec49 HC	177	if (info->mt_installed) {
	178	seq_printf(m, "CPUs G-MTID: %d\n", info->mt_gtid);
	179	seq_printf(m, "CPUs S-MTID: %d\n", info->mt_stid);
	180	}
0facaa17 HC	181	/*
	182	* Sigh 2. According to the specification the alternate
	183	* capability field is a 32 bit floating point number
	184	* if the higher order 8 bits are not zero. Printing
	185	* a floating point number in the kernel is a no-no,
	186	* always print the number as 32 bit unsigned integer.
	187	* The user-space needs to know about the strange
	188	* encoding of the alternate cpu capability.
	189	*/
	190	seq_printf(m, "Capability: %u", info->capability);
	191	if (info->format == 1)
	192	seq_printf(m, " %u", ext->alt_capability);
	193	seq_putc(m, '\n');
25502f00 HC	194	if (info->nominal_cap)
	195	seq_printf(m, "Nominal Capability: %d\n", info->nominal_cap);
	196	if (info->secondary_cap)
	197	seq_printf(m, "Secondary Capability: %d\n", info->secondary_cap);
0facaa17 HC	198	for (i = 2; i <= info->cpus_total; i++) {
	199	seq_printf(m, "Adjustment %02d-way: %u",
	200	i, info->adjustment[i-2]);
	201	if (info->format == 1)
	202	seq_printf(m, " %u", ext->alt_adjustment[i-2]);
	203	seq_putc(m, '\n');
0fee644a	204	}
1da177e4 LT	205	}
1da177e4 LT	206
0facaa17	207	static void stsi_2_2_2(struct seq_file m, struct sysinfo_2_2_2 info)
1da177e4	208	{
caf757c6	209	if (stsi(info, 2, 2, 2))
0facaa17	210	return;
94f5b09d	211	EBCASC(info->name, sizeof(info->name));
0facaa17 HC	212	seq_putc(m, '\n');
	213	seq_printf(m, "LPAR Number: %d\n", info->lpar_number);
	214	seq_printf(m, "LPAR Characteristics: ");
0fee644a	215	if (info->characteristics & LPAR_CHAR_DEDICATED)
0facaa17	216	seq_printf(m, "Dedicated ");
0fee644a	217	if (info->characteristics & LPAR_CHAR_SHARED)
0facaa17	218	seq_printf(m, "Shared ");
0fee644a	219	if (info->characteristics & LPAR_CHAR_LIMITED)
0facaa17 HC	220	seq_printf(m, "Limited ");
	221	seq_putc(m, '\n');
	222	seq_printf(m, "LPAR Name: %-8.8s\n", info->name);
	223	seq_printf(m, "LPAR Adjustment: %d\n", info->caf);
	224	seq_printf(m, "LPAR CPUs Total: %d\n", info->cpus_total);
	225	seq_printf(m, "LPAR CPUs Configured: %d\n", info->cpus_configured);
	226	seq_printf(m, "LPAR CPUs Standby: %d\n", info->cpus_standby);
	227	seq_printf(m, "LPAR CPUs Reserved: %d\n", info->cpus_reserved);
	228	seq_printf(m, "LPAR CPUs Dedicated: %d\n", info->cpus_dedicated);
	229	seq_printf(m, "LPAR CPUs Shared: %d\n", info->cpus_shared);
7022ec49 HC	230	if (info->mt_installed) {
	231	seq_printf(m, "LPAR CPUs G-MTID: %d\n", info->mt_gtid);
	232	seq_printf(m, "LPAR CPUs S-MTID: %d\n", info->mt_stid);
	233	seq_printf(m, "LPAR CPUs PS-MTID: %d\n", info->mt_psmtid);
10ad34bc	234	}
e32eae10 VM	235	if (convert_ext_name(info->vsne, info->ext_name, sizeof(info->ext_name))) {
	236	seq_printf(m, "LPAR Extended Name: %-.256s\n", info->ext_name);
	237	seq_printf(m, "LPAR UUID: %pUb\n", &info->uuid);
	238	}
1da177e4 LT	239	}
1da177e4 LT	240
f3d0bd6c ET	241	static void print_ext_name(struct seq_file *m, int lvl,
	242	struct sysinfo_3_2_2 *info)
	243	{
e32eae10 VM	244	size_t len = sizeof(info->ext_names[lvl]);
	245
	246	if (!convert_ext_name(info->vm[lvl].evmne, info->ext_names[lvl], len))
f3d0bd6c	247	return;
f3d0bd6c ET	248	seq_printf(m, "VM%02d Extended Name: %-.256s\n", lvl,
	249	info->ext_names[lvl]);
	250	}
	251
	252	static void print_uuid(struct seq_file m, int i, struct sysinfo_3_2_2 info)
	253	{
e64e17a5	254	if (uuid_is_null(&info->vm[i].uuid))
f3d0bd6c ET	255	return;
	256	seq_printf(m, "VM%02d UUID: %pUb\n", i, &info->vm[i].uuid);
	257	}
	258
0facaa17	259	static void stsi_3_2_2(struct seq_file m, struct sysinfo_3_2_2 info)
1da177e4	260	{
0fee644a MS	261	int i;
0fee644a MS	262
caf757c6	263	if (stsi(info, 3, 2, 2))
0facaa17	264	return;
0fee644a	265	for (i = 0; i < info->count; i++) {
94f5b09d HC	266	EBCASC(info->vm[i].name, sizeof(info->vm[i].name));
94f5b09d HC	267	EBCASC(info->vm[i].cpi, sizeof(info->vm[i].cpi));
0facaa17 HC	268	seq_putc(m, '\n');
	269	seq_printf(m, "VM%02d Name: %-8.8s\n", i, info->vm[i].name);
	270	seq_printf(m, "VM%02d Control Program: %-16.16s\n", i, info->vm[i].cpi);
	271	seq_printf(m, "VM%02d Adjustment: %d\n", i, info->vm[i].caf);
	272	seq_printf(m, "VM%02d CPUs Total: %d\n", i, info->vm[i].cpus_total);
	273	seq_printf(m, "VM%02d CPUs Configured: %d\n", i, info->vm[i].cpus_configured);
	274	seq_printf(m, "VM%02d CPUs Standby: %d\n", i, info->vm[i].cpus_standby);
	275	seq_printf(m, "VM%02d CPUs Reserved: %d\n", i, info->vm[i].cpus_reserved);
f3d0bd6c ET	276	print_ext_name(m, i, info);
f3d0bd6c ET	277	print_uuid(m, i, info);
1da177e4	278	}
1da177e4 LT	279	}
1da177e4 LT	280
0facaa17	281	static int sysinfo_show(struct seq_file m, void v)
1da177e4	282	{
0facaa17 HC	283	void info = (void )get_zeroed_page(GFP_KERNEL);
0facaa17 HC	284	int level;
94f5b09d	285
1da177e4 LT	286	if (!info)
1da177e4 LT	287	return 0;
caf757c6	288	level = stsi(NULL, 0, 0, 0);
0fee644a	289	if (level >= 1)
0facaa17	290	stsi_1_1_1(m, info);
0fee644a	291	if (level >= 1)
0facaa17	292	stsi_15_1_x(m, info);
96f4a70d	293	if (level >= 1)
0facaa17	294	stsi_1_2_2(m, info);
0fee644a	295	if (level >= 2)
0facaa17	296	stsi_2_2_2(m, info);
0fee644a	297	if (level >= 3)
0facaa17 HC	298	stsi_3_2_2(m, info);
	299	free_page((unsigned long)info);
	300	return 0;
	301	}
1da177e4	302
0facaa17	303	static int __init sysinfo_create_proc(void)
1da177e4	304	{
3f3942ac	305	proc_create_single("sysinfo", 0444, NULL, sysinfo_show);
1da177e4 LT	306	return 0;
1da177e4 LT	307	}
0facaa17	308	device_initcall(sysinfo_create_proc);
1da177e4	309
9f35b818 HC	310	#endif /* CONFIG_PROC_FS */
9f35b818 HC	311
6bcac508 MS	312	/*
	313	* Service levels interface.
	314	*/
	315
	316	static DECLARE_RWSEM(service_level_sem);
	317	static LIST_HEAD(service_level_list);
	318
	319	int register_service_level(struct service_level *slr)
	320	{
	321	struct service_level *ptr;
	322
	323	down_write(&service_level_sem);
	324	list_for_each_entry(ptr, &service_level_list, list)
	325	if (ptr == slr) {
	326	up_write(&service_level_sem);
	327	return -EEXIST;
	328	}
	329	list_add_tail(&slr->list, &service_level_list);
	330	up_write(&service_level_sem);
	331	return 0;
	332	}
	333	EXPORT_SYMBOL(register_service_level);
	334
	335	int unregister_service_level(struct service_level *slr)
	336	{
	337	struct service_level ptr, next;
	338	int rc = -ENOENT;
	339
	340	down_write(&service_level_sem);
	341	list_for_each_entry_safe(ptr, next, &service_level_list, list) {
	342	if (ptr != slr)
	343	continue;
	344	list_del(&ptr->list);
	345	rc = 0;
	346	break;
	347	}
	348	up_write(&service_level_sem);
	349	return rc;
	350	}
	351	EXPORT_SYMBOL(unregister_service_level);
	352
	353	static void service_level_start(struct seq_file m, loff_t *pos)
	354	{
	355	down_read(&service_level_sem);
	356	return seq_list_start(&service_level_list, *pos);
	357	}
	358
	359	static void service_level_next(struct seq_file m, void p, loff_t pos)
	360	{
	361	return seq_list_next(p, &service_level_list, pos);
	362	}
	363
	364	static void service_level_stop(struct seq_file m, void p)
	365	{
	366	up_read(&service_level_sem);
	367	}
	368
	369	static int service_level_show(struct seq_file m, void p)
	370	{
	371	struct service_level *slr;
	372
	373	slr = list_entry(p, struct service_level, list);
	374	slr->seq_print(m, slr);
	375	return 0;
376	}
377
378	static const struct seq_operations service_level_seq_ops = {
379	.start = service_level_start,
380	.next = service_level_next,
381	.stop = service_level_stop,
382	.show = service_level_show
383	};
384
6bcac508 MS	385	static void service_level_vm_print(struct seq_file *m,
	386	struct service_level *slr)
	387	{
	388	char query_buffer, str;
	389
	390	query_buffer = kmalloc(1024, GFP_KERNEL \| GFP_DMA);
	391	if (!query_buffer)
	392	return;
	393	cpcmd("QUERY CPLEVEL", query_buffer, 1024, NULL);
	394	str = strchr(query_buffer, '\n');
	395	if (str)
	396	*str = 0;
	397	seq_printf(m, "VM: %s\n", query_buffer);
	398	kfree(query_buffer);
	399	}
	400
	401	static struct service_level service_level_vm = {
	402	.seq_print = service_level_vm_print
	403	};
	404
	405	static __init int create_proc_service_level(void)
	406	{
fddda2b7	407	proc_create_seq("service_levels", 0, NULL, &service_level_seq_ops);
6bcac508 MS	408	if (MACHINE_IS_VM)
	409	register_service_level(&service_level_vm);
	410	return 0;
	411	}
6bcac508 MS	412	subsys_initcall(create_proc_service_level);
6bcac508 MS	413
31ee4b2f MS	414	/*
	415	* CPU capability might have changed. Therefore recalculate loops_per_jiffy.
	416	*/
	417	void s390_adjust_jiffies(void)
	418	{
	419	struct sysinfo_1_2_2 *info;
9c203239 HC	420	unsigned long capability;
9c203239 HC	421	struct kernel_fpu fpu;
31ee4b2f MS	422
	423	info = (void *) get_zeroed_page(GFP_KERNEL);
	424	if (!info)
	425	return;
	426
caf757c6	427	if (stsi(info, 1, 2, 2) == 0) {
31ee4b2f MS	428	/*
	429	* Major sigh. The cpu capability encoding is "special".
	430	* If the first 9 bits of info->capability are 0 then it
	431	* is a 32 bit unsigned integer in the range 0 .. 2^23.
	432	* If the first 9 bits are != 0 then it is a 32 bit float.
	433	* In addition a lower value indicates a proportionally
	434	* higher cpu capacity. Bogomips are the other way round.
	435	* To get to a halfway suitable number we divide 1e7
	436	* by the cpu capability number. Yes, that means a floating
9c203239	437	* point division ..
31ee4b2f	438	*/
9c203239 HC	439	kernel_fpu_begin(&fpu, KERNEL_FPR);
	440	asm volatile(
	441	" sfpc %3\n"
	442	" l %0,%1\n"
	443	" tmlh %0,0xff80\n"
	444	" jnz 0f\n"
	445	" cefbr %%f2,%0\n"
	446	" j 1f\n"
	447	"0: le %%f2,%1\n"
	448	"1: cefbr %%f0,%2\n"
	449	" debr %%f0,%%f2\n"
	450	" cgebr %0,5,%%f0\n"
	451	: "=&d" (capability)
	452	: "Q" (info->capability), "d" (10000000), "d" (0)
	453	: "cc"
	454	);
7f79695c	455	kernel_fpu_end(&fpu, KERNEL_FPR);
31ee4b2f MS	456	} else
	457	/*
	458	* Really old machine without stsi block for basic
	459	* cpu information. Report 42.0 bogomips.
	460	*/
	461	capability = 42;
	462	loops_per_jiffy = capability * (500000/HZ);
	463	free_page((unsigned long) info);
	464	}
	465
	466	/*
	467	* calibrate the delay loop
	468	*/
e2741f17	469	void calibrate_delay(void)
31ee4b2f MS	470	{
	471	s390_adjust_jiffies();
	472	/* Print the good old Bogomips line .. */
	473	printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
	474	"%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
	475	(loops_per_jiffy/(5000/HZ)) % 100);
	476	}
ae5ca67a HC	477
	478	#ifdef CONFIG_DEBUG_FS
	479
	480	#define STSI_FILE(fc, s1, s2) \
	481	static int stsi_open_##fc##_##s1##_##s2(struct inode inode, struct file file)\
	482	{ \
	483	file->private_data = (void *) get_zeroed_page(GFP_KERNEL); \
	484	if (!file->private_data) \
	485	return -ENOMEM; \
	486	if (stsi(file->private_data, fc, s1, s2)) { \
	487	free_page((unsigned long)file->private_data); \
	488	file->private_data = NULL; \
	489	return -EACCES; \
	490	} \
	491	return nonseekable_open(inode, file); \
	492	} \
	493	\
	494	static const struct file_operations stsi_##fc##_##s1##_##s2##_fs_ops = { \
	495	.open = stsi_open_##fc##_##s1##_##s2, \
	496	.release = stsi_release, \
	497	.read = stsi_read, \
	498	.llseek = no_llseek, \
	499	};
	500
	501	static int stsi_release(struct inode inode, struct file file)
	502	{
	503	free_page((unsigned long)file->private_data);
	504	return 0;
	505	}
	506
	507	static ssize_t stsi_read(struct file file, char __user buf, size_t size, loff_t *ppos)
	508	{
	509	return simple_read_from_buffer(buf, size, ppos, file->private_data, PAGE_SIZE);
	510	}
	511
cdd3bd9d HC	512	STSI_FILE( 1, 1, 1);
	513	STSI_FILE( 1, 2, 1);
	514	STSI_FILE( 1, 2, 2);
	515	STSI_FILE( 2, 2, 1);
	516	STSI_FILE( 2, 2, 2);
	517	STSI_FILE( 3, 2, 2);
ae5ca67a HC	518	STSI_FILE(15, 1, 2);
	519	STSI_FILE(15, 1, 3);
	520	STSI_FILE(15, 1, 4);
	521	STSI_FILE(15, 1, 5);
	522	STSI_FILE(15, 1, 6);
	523
	524	struct stsi_file {
	525	const struct file_operations *fops;
	526	char *name;
	527	};
	528
	529	static struct stsi_file stsi_file[] __initdata = {
cdd3bd9d HC	530	{.fops = &stsi_1_1_1_fs_ops, .name = "1_1_1"},
	531	{.fops = &stsi_1_2_1_fs_ops, .name = "1_2_1"},
	532	{.fops = &stsi_1_2_2_fs_ops, .name = "1_2_2"},
	533	{.fops = &stsi_2_2_1_fs_ops, .name = "2_2_1"},
	534	{.fops = &stsi_2_2_2_fs_ops, .name = "2_2_2"},
	535	{.fops = &stsi_3_2_2_fs_ops, .name = "3_2_2"},
ae5ca67a HC	536	{.fops = &stsi_15_1_2_fs_ops, .name = "15_1_2"},
	537	{.fops = &stsi_15_1_3_fs_ops, .name = "15_1_3"},
	538	{.fops = &stsi_15_1_4_fs_ops, .name = "15_1_4"},
	539	{.fops = &stsi_15_1_5_fs_ops, .name = "15_1_5"},
	540	{.fops = &stsi_15_1_6_fs_ops, .name = "15_1_6"},
	541	};
	542
cdd3bd9d HC	543	static u8 stsi_0_0_0;
cdd3bd9d HC	544
ae5ca67a HC	545	static __init int stsi_init_debugfs(void)
	546	{
	547	struct dentry *stsi_root;
	548	struct stsi_file *sf;
cdd3bd9d	549	int lvl, i;
ae5ca67a HC	550
ae5ca67a HC	551	stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
cdd3bd9d HC	552	lvl = stsi(NULL, 0, 0, 0);
	553	if (lvl > 0)
	554	stsi_0_0_0 = lvl;
	555	debugfs_create_u8("0_0_0", 0400, stsi_root, &stsi_0_0_0);
ae5ca67a HC	556	for (i = 0; i < ARRAY_SIZE(stsi_file); i++) {
	557	sf = &stsi_file[i];
	558	debugfs_create_file(sf->name, 0400, stsi_root, NULL, sf->fops);
	559	}
	560	if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY) && MACHINE_HAS_TOPOLOGY) {
	561	char link_to[10];
	562
	563	sprintf(link_to, "15_1_%d", topology_mnest_limit());
	564	debugfs_create_symlink("topology", stsi_root, link_to);
	565	}
	566	return 0;
	567	}
	568	device_initcall(stsi_init_debugfs);
	569
	570	#endif /* CONFIG_DEBUG_FS */