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kernel-ark/drivers/s390/sysinfo.c
Heiko Carstens 2fc2d1e9ff [S390] Processor degradation notification. 
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>
2007-04-27 16:01:46 +02:00

433 lines
12 KiB
C
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/*
* 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);
}
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