2fc2d1e9ff
Generate uevents for all cpus if cpu capability changes. This can happen e.g. because the cpus are overheating. The cpu capability can be read via /sys/devices/system/cpu/cpuN/capability. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
433 lines
12 KiB
C
433 lines
12 KiB
C
/*
|
|
* drivers/s390/sysinfo.c
|
|
*
|
|
* Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
|
* Author(s): Ulrich Weigand (Ulrich.Weigand@de.ibm.com)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/ebcdic.h>
|
|
|
|
/* Sigh, math-emu. Don't ask. */
|
|
#include <asm/sfp-util.h>
|
|
#include <math-emu/soft-fp.h>
|
|
#include <math-emu/single.h>
|
|
|
|
struct sysinfo_1_1_1 {
|
|
char reserved_0[32];
|
|
char manufacturer[16];
|
|
char type[4];
|
|
char reserved_1[12];
|
|
char model_capacity[16];
|
|
char sequence[16];
|
|
char plant[4];
|
|
char model[16];
|
|
};
|
|
|
|
struct sysinfo_1_2_1 {
|
|
char reserved_0[80];
|
|
char sequence[16];
|
|
char plant[4];
|
|
char reserved_1[2];
|
|
unsigned short cpu_address;
|
|
};
|
|
|
|
struct sysinfo_1_2_2 {
|
|
char format;
|
|
char reserved_0[1];
|
|
unsigned short acc_offset;
|
|
char reserved_1[24];
|
|
unsigned int secondary_capability;
|
|
unsigned int capability;
|
|
unsigned short cpus_total;
|
|
unsigned short cpus_configured;
|
|
unsigned short cpus_standby;
|
|
unsigned short cpus_reserved;
|
|
unsigned short adjustment[0];
|
|
};
|
|
|
|
struct sysinfo_1_2_2_extension {
|
|
unsigned int alt_capability;
|
|
unsigned short alt_adjustment[0];
|
|
};
|
|
|
|
struct sysinfo_2_2_1 {
|
|
char reserved_0[80];
|
|
char sequence[16];
|
|
char plant[4];
|
|
unsigned short cpu_id;
|
|
unsigned short cpu_address;
|
|
};
|
|
|
|
struct sysinfo_2_2_2 {
|
|
char reserved_0[32];
|
|
unsigned short lpar_number;
|
|
char reserved_1;
|
|
unsigned char characteristics;
|
|
unsigned short cpus_total;
|
|
unsigned short cpus_configured;
|
|
unsigned short cpus_standby;
|
|
unsigned short cpus_reserved;
|
|
char name[8];
|
|
unsigned int caf;
|
|
char reserved_2[16];
|
|
unsigned short cpus_dedicated;
|
|
unsigned short cpus_shared;
|
|
};
|
|
|
|
#define LPAR_CHAR_DEDICATED (1 << 7)
|
|
#define LPAR_CHAR_SHARED (1 << 6)
|
|
#define LPAR_CHAR_LIMITED (1 << 5)
|
|
|
|
struct sysinfo_3_2_2 {
|
|
char reserved_0[31];
|
|
unsigned char count;
|
|
struct {
|
|
char reserved_0[4];
|
|
unsigned short cpus_total;
|
|
unsigned short cpus_configured;
|
|
unsigned short cpus_standby;
|
|
unsigned short cpus_reserved;
|
|
char name[8];
|
|
unsigned int caf;
|
|
char cpi[16];
|
|
char reserved_1[24];
|
|
|
|
} vm[8];
|
|
};
|
|
|
|
static inline int stsi(void *sysinfo, int fc, int sel1, int sel2)
|
|
{
|
|
register int r0 asm("0") = (fc << 28) | sel1;
|
|
register int r1 asm("1") = sel2;
|
|
|
|
asm volatile(
|
|
" stsi 0(%2)\n"
|
|
"0: jz 2f\n"
|
|
"1: lhi %0,%3\n"
|
|
"2:\n"
|
|
EX_TABLE(0b,1b)
|
|
: "+d" (r0) : "d" (r1), "a" (sysinfo), "K" (-ENOSYS)
|
|
: "cc", "memory" );
|
|
return r0;
|
|
}
|
|
|
|
static inline int stsi_0(void)
|
|
{
|
|
int rc = stsi (NULL, 0, 0, 0);
|
|
return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
|
|
}
|
|
|
|
static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
|
|
{
|
|
if (stsi(info, 1, 1, 1) == -ENOSYS)
|
|
return len;
|
|
|
|
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));
|
|
len += sprintf(page + len, "Manufacturer: %-16.16s\n",
|
|
info->manufacturer);
|
|
len += sprintf(page + len, "Type: %-4.4s\n",
|
|
info->type);
|
|
if (info->model[0] != '\0')
|
|
/*
|
|
* 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 .
|
|
*/
|
|
len += sprintf(page + len,
|
|
"Model: %-16.16s %-16.16s\n",
|
|
info->model_capacity, info->model);
|
|
else
|
|
len += sprintf(page + len, "Model: %-16.16s\n",
|
|
info->model_capacity);
|
|
len += sprintf(page + len, "Sequence Code: %-16.16s\n",
|
|
info->sequence);
|
|
len += sprintf(page + len, "Plant: %-4.4s\n",
|
|
info->plant);
|
|
len += sprintf(page + len, "Model Capacity: %-16.16s\n",
|
|
info->model_capacity);
|
|
return len;
|
|
}
|
|
|
|
#if 0 /* Currently unused */
|
|
static int stsi_1_2_1(struct sysinfo_1_2_1 *info, char *page, int len)
|
|
{
|
|
if (stsi(info, 1, 2, 1) == -ENOSYS)
|
|
return len;
|
|
|
|
len += sprintf(page + len, "\n");
|
|
EBCASC(info->sequence, sizeof(info->sequence));
|
|
EBCASC(info->plant, sizeof(info->plant));
|
|
len += sprintf(page + len, "Sequence Code of CPU: %-16.16s\n",
|
|
info->sequence);
|
|
len += sprintf(page + len, "Plant of CPU: %-16.16s\n",
|
|
info->plant);
|
|
return len;
|
|
}
|
|
#endif
|
|
|
|
static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
|
|
{
|
|
struct sysinfo_1_2_2_extension *ext;
|
|
int i;
|
|
|
|
if (stsi(info, 1, 2, 2) == -ENOSYS)
|
|
return len;
|
|
ext = (struct sysinfo_1_2_2_extension *)
|
|
((unsigned long) info + info->acc_offset);
|
|
|
|
len += sprintf(page + len, "\n");
|
|
len += sprintf(page + len, "CPUs Total: %d\n",
|
|
info->cpus_total);
|
|
len += sprintf(page + len, "CPUs Configured: %d\n",
|
|
info->cpus_configured);
|
|
len += sprintf(page + len, "CPUs Standby: %d\n",
|
|
info->cpus_standby);
|
|
len += sprintf(page + len, "CPUs Reserved: %d\n",
|
|
info->cpus_reserved);
|
|
|
|
if (info->format == 1) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
len += sprintf(page + len, "Capability: %u %u\n",
|
|
info->capability, ext->alt_capability);
|
|
for (i = 2; i <= info->cpus_total; i++)
|
|
len += sprintf(page + len,
|
|
"Adjustment %02d-way: %u %u\n",
|
|
i, info->adjustment[i-2],
|
|
ext->alt_adjustment[i-2]);
|
|
|
|
} else {
|
|
len += sprintf(page + len, "Capability: %u\n",
|
|
info->capability);
|
|
for (i = 2; i <= info->cpus_total; i++)
|
|
len += sprintf(page + len,
|
|
"Adjustment %02d-way: %u\n",
|
|
i, info->adjustment[i-2]);
|
|
}
|
|
|
|
if (info->secondary_capability != 0)
|
|
len += sprintf(page + len, "Secondary Capability: %d\n",
|
|
info->secondary_capability);
|
|
|
|
return len;
|
|
}
|
|
|
|
#if 0 /* Currently unused */
|
|
static int stsi_2_2_1(struct sysinfo_2_2_1 *info, char *page, int len)
|
|
{
|
|
if (stsi(info, 2, 2, 1) == -ENOSYS)
|
|
return len;
|
|
|
|
len += sprintf(page + len, "\n");
|
|
EBCASC (info->sequence, sizeof(info->sequence));
|
|
EBCASC (info->plant, sizeof(info->plant));
|
|
len += sprintf(page + len, "Sequence Code of logical CPU: %-16.16s\n",
|
|
info->sequence);
|
|
len += sprintf(page + len, "Plant of logical CPU: %-16.16s\n",
|
|
info->plant);
|
|
return len;
|
|
}
|
|
#endif
|
|
|
|
static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
|
|
{
|
|
if (stsi(info, 2, 2, 2) == -ENOSYS)
|
|
return len;
|
|
|
|
EBCASC (info->name, sizeof(info->name));
|
|
|
|
len += sprintf(page + len, "\n");
|
|
len += sprintf(page + len, "LPAR Number: %d\n",
|
|
info->lpar_number);
|
|
|
|
len += sprintf(page + len, "LPAR Characteristics: ");
|
|
if (info->characteristics & LPAR_CHAR_DEDICATED)
|
|
len += sprintf(page + len, "Dedicated ");
|
|
if (info->characteristics & LPAR_CHAR_SHARED)
|
|
len += sprintf(page + len, "Shared ");
|
|
if (info->characteristics & LPAR_CHAR_LIMITED)
|
|
len += sprintf(page + len, "Limited ");
|
|
len += sprintf(page + len, "\n");
|
|
|
|
len += sprintf(page + len, "LPAR Name: %-8.8s\n",
|
|
info->name);
|
|
|
|
len += sprintf(page + len, "LPAR Adjustment: %d\n",
|
|
info->caf);
|
|
|
|
len += sprintf(page + len, "LPAR CPUs Total: %d\n",
|
|
info->cpus_total);
|
|
len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
|
|
info->cpus_configured);
|
|
len += sprintf(page + len, "LPAR CPUs Standby: %d\n",
|
|
info->cpus_standby);
|
|
len += sprintf(page + len, "LPAR CPUs Reserved: %d\n",
|
|
info->cpus_reserved);
|
|
len += sprintf(page + len, "LPAR CPUs Dedicated: %d\n",
|
|
info->cpus_dedicated);
|
|
len += sprintf(page + len, "LPAR CPUs Shared: %d\n",
|
|
info->cpus_shared);
|
|
return len;
|
|
}
|
|
|
|
static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
|
|
{
|
|
int i;
|
|
|
|
if (stsi(info, 3, 2, 2) == -ENOSYS)
|
|
return len;
|
|
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));
|
|
len += sprintf(page + len, "\n");
|
|
len += sprintf(page + len, "VM%02d Name: %-8.8s\n",
|
|
i, info->vm[i].name);
|
|
len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
|
|
i, info->vm[i].cpi);
|
|
|
|
len += sprintf(page + len, "VM%02d Adjustment: %d\n",
|
|
i, info->vm[i].caf);
|
|
|
|
len += sprintf(page + len, "VM%02d CPUs Total: %d\n",
|
|
i, info->vm[i].cpus_total);
|
|
len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
|
|
i, info->vm[i].cpus_configured);
|
|
len += sprintf(page + len, "VM%02d CPUs Standby: %d\n",
|
|
i, info->vm[i].cpus_standby);
|
|
len += sprintf(page + len, "VM%02d CPUs Reserved: %d\n",
|
|
i, info->vm[i].cpus_reserved);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
|
|
static int proc_read_sysinfo(char *page, char **start,
|
|
off_t off, int count,
|
|
int *eof, void *data)
|
|
{
|
|
unsigned long info = get_zeroed_page (GFP_KERNEL);
|
|
int level, len;
|
|
|
|
if (!info)
|
|
return 0;
|
|
|
|
len = 0;
|
|
level = stsi_0();
|
|
if (level >= 1)
|
|
len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
|
|
|
|
if (level >= 1)
|
|
len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
|
|
|
|
if (level >= 2)
|
|
len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
|
|
|
|
if (level >= 3)
|
|
len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
|
|
|
|
free_page (info);
|
|
return len;
|
|
}
|
|
|
|
static __init int create_proc_sysinfo(void)
|
|
{
|
|
create_proc_read_entry("sysinfo", 0444, NULL,
|
|
proc_read_sysinfo, NULL);
|
|
return 0;
|
|
}
|
|
|
|
__initcall(create_proc_sysinfo);
|
|
|
|
int get_cpu_capability(unsigned int *capability)
|
|
{
|
|
struct sysinfo_1_2_2 *info;
|
|
int rc;
|
|
|
|
info = (void *) get_zeroed_page(GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
rc = stsi(info, 1, 2, 2);
|
|
if (rc == -ENOSYS)
|
|
goto out;
|
|
rc = 0;
|
|
*capability = info->capability;
|
|
out:
|
|
free_page((unsigned long) info);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* CPU capability might have changed. Therefore recalculate loops_per_jiffy.
|
|
*/
|
|
void s390_adjust_jiffies(void)
|
|
{
|
|
struct sysinfo_1_2_2 *info;
|
|
const unsigned int fmil = 0x4b189680; /* 1e7 as 32-bit float. */
|
|
FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
|
|
FP_DECL_EX;
|
|
unsigned int capability;
|
|
|
|
info = (void *) get_zeroed_page(GFP_KERNEL);
|
|
if (!info)
|
|
return;
|
|
|
|
if (stsi(info, 1, 2, 2) != -ENOSYS) {
|
|
/*
|
|
* 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 .. math-emu here we come :-)
|
|
*/
|
|
FP_UNPACK_SP(SA, &fmil);
|
|
if ((info->capability >> 23) == 0)
|
|
FP_FROM_INT_S(SB, info->capability, 32, int);
|
|
else
|
|
FP_UNPACK_SP(SB, &info->capability);
|
|
FP_DIV_S(SR, SA, SB);
|
|
FP_TO_INT_S(capability, SR, 32, 0);
|
|
} 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 __init 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);
|
|
}
|