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>
432 lines
12 KiB
C
432 lines
12 KiB
C
/*
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* drivers/s390/sysinfo.c
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*
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* Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Ulrich Weigand (Ulrich.Weigand@de.ibm.com)
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <asm/ebcdic.h>
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/* Sigh, math-emu. Don't ask. */
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#include <asm/sfp-util.h>
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#include <math-emu/soft-fp.h>
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#include <math-emu/single.h>
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struct sysinfo_1_1_1 {
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char reserved_0[32];
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char manufacturer[16];
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char type[4];
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char reserved_1[12];
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char model_capacity[16];
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char sequence[16];
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char plant[4];
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char model[16];
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};
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struct sysinfo_1_2_1 {
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char reserved_0[80];
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char sequence[16];
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char plant[4];
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char reserved_1[2];
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unsigned short cpu_address;
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};
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struct sysinfo_1_2_2 {
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char format;
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char reserved_0[1];
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unsigned short acc_offset;
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char reserved_1[24];
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unsigned int secondary_capability;
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unsigned int capability;
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unsigned short cpus_total;
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unsigned short cpus_configured;
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unsigned short cpus_standby;
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unsigned short cpus_reserved;
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unsigned short adjustment[0];
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};
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struct sysinfo_1_2_2_extension {
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unsigned int alt_capability;
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unsigned short alt_adjustment[0];
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};
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struct sysinfo_2_2_1 {
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char reserved_0[80];
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char sequence[16];
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char plant[4];
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unsigned short cpu_id;
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unsigned short cpu_address;
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};
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struct sysinfo_2_2_2 {
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char reserved_0[32];
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unsigned short lpar_number;
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char reserved_1;
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unsigned char characteristics;
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unsigned short cpus_total;
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unsigned short cpus_configured;
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unsigned short cpus_standby;
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unsigned short cpus_reserved;
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char name[8];
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unsigned int caf;
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char reserved_2[16];
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unsigned short cpus_dedicated;
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unsigned short cpus_shared;
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};
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#define LPAR_CHAR_DEDICATED (1 << 7)
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#define LPAR_CHAR_SHARED (1 << 6)
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#define LPAR_CHAR_LIMITED (1 << 5)
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struct sysinfo_3_2_2 {
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char reserved_0[31];
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unsigned char count;
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struct {
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char reserved_0[4];
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unsigned short cpus_total;
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unsigned short cpus_configured;
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unsigned short cpus_standby;
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unsigned short cpus_reserved;
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char name[8];
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unsigned int caf;
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char cpi[16];
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char reserved_1[24];
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} vm[8];
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};
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static inline int stsi(void *sysinfo, int fc, int sel1, int sel2)
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{
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register int r0 asm("0") = (fc << 28) | sel1;
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register int r1 asm("1") = sel2;
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asm volatile(
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" stsi 0(%2)\n"
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"0: jz 2f\n"
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"1: lhi %0,%3\n"
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"2:\n"
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EX_TABLE(0b,1b)
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: "+d" (r0) : "d" (r1), "a" (sysinfo), "K" (-ENOSYS)
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: "cc", "memory" );
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return r0;
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}
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static inline int stsi_0(void)
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{
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int rc = stsi (NULL, 0, 0, 0);
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return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28);
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}
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static int stsi_1_1_1(struct sysinfo_1_1_1 *info, char *page, int len)
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{
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if (stsi(info, 1, 1, 1) == -ENOSYS)
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return len;
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EBCASC(info->manufacturer, sizeof(info->manufacturer));
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EBCASC(info->type, sizeof(info->type));
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EBCASC(info->model, sizeof(info->model));
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EBCASC(info->sequence, sizeof(info->sequence));
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EBCASC(info->plant, sizeof(info->plant));
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EBCASC(info->model_capacity, sizeof(info->model_capacity));
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len += sprintf(page + len, "Manufacturer: %-16.16s\n",
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info->manufacturer);
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len += sprintf(page + len, "Type: %-4.4s\n",
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info->type);
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if (info->model[0] != '\0')
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/*
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* Sigh: the model field has been renamed with System z9
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* to model_capacity and a new model field has been added
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* after the plant field. To avoid confusing older programs
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* the "Model:" prints "model_capacity model" or just
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* "model_capacity" if the model string is empty .
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*/
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len += sprintf(page + len,
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"Model: %-16.16s %-16.16s\n",
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info->model_capacity, info->model);
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else
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len += sprintf(page + len, "Model: %-16.16s\n",
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info->model_capacity);
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len += sprintf(page + len, "Sequence Code: %-16.16s\n",
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info->sequence);
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len += sprintf(page + len, "Plant: %-4.4s\n",
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info->plant);
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len += sprintf(page + len, "Model Capacity: %-16.16s\n",
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info->model_capacity);
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return len;
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}
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#if 0 /* Currently unused */
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static int stsi_1_2_1(struct sysinfo_1_2_1 *info, char *page, int len)
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{
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if (stsi(info, 1, 2, 1) == -ENOSYS)
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return len;
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len += sprintf(page + len, "\n");
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EBCASC(info->sequence, sizeof(info->sequence));
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EBCASC(info->plant, sizeof(info->plant));
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len += sprintf(page + len, "Sequence Code of CPU: %-16.16s\n",
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info->sequence);
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len += sprintf(page + len, "Plant of CPU: %-16.16s\n",
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info->plant);
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return len;
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}
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#endif
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static int stsi_1_2_2(struct sysinfo_1_2_2 *info, char *page, int len)
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{
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struct sysinfo_1_2_2_extension *ext;
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int i;
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if (stsi(info, 1, 2, 2) == -ENOSYS)
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return len;
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ext = (struct sysinfo_1_2_2_extension *)
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((unsigned long) info + info->acc_offset);
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len += sprintf(page + len, "\n");
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len += sprintf(page + len, "CPUs Total: %d\n",
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info->cpus_total);
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len += sprintf(page + len, "CPUs Configured: %d\n",
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info->cpus_configured);
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len += sprintf(page + len, "CPUs Standby: %d\n",
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info->cpus_standby);
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len += sprintf(page + len, "CPUs Reserved: %d\n",
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info->cpus_reserved);
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if (info->format == 1) {
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/*
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* Sigh 2. According to the specification the alternate
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* capability field is a 32 bit floating point number
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* if the higher order 8 bits are not zero. Printing
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* a floating point number in the kernel is a no-no,
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* always print the number as 32 bit unsigned integer.
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* The user-space needs to know about the strange
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* encoding of the alternate cpu capability.
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*/
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len += sprintf(page + len, "Capability: %u %u\n",
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info->capability, ext->alt_capability);
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for (i = 2; i <= info->cpus_total; i++)
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len += sprintf(page + len,
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"Adjustment %02d-way: %u %u\n",
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i, info->adjustment[i-2],
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ext->alt_adjustment[i-2]);
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} else {
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len += sprintf(page + len, "Capability: %u\n",
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info->capability);
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for (i = 2; i <= info->cpus_total; i++)
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len += sprintf(page + len,
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"Adjustment %02d-way: %u\n",
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i, info->adjustment[i-2]);
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}
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if (info->secondary_capability != 0)
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len += sprintf(page + len, "Secondary Capability: %d\n",
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info->secondary_capability);
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return len;
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}
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#if 0 /* Currently unused */
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static int stsi_2_2_1(struct sysinfo_2_2_1 *info, char *page, int len)
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{
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if (stsi(info, 2, 2, 1) == -ENOSYS)
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return len;
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len += sprintf(page + len, "\n");
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EBCASC (info->sequence, sizeof(info->sequence));
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EBCASC (info->plant, sizeof(info->plant));
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len += sprintf(page + len, "Sequence Code of logical CPU: %-16.16s\n",
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info->sequence);
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len += sprintf(page + len, "Plant of logical CPU: %-16.16s\n",
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info->plant);
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return len;
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}
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#endif
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static int stsi_2_2_2(struct sysinfo_2_2_2 *info, char *page, int len)
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{
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if (stsi(info, 2, 2, 2) == -ENOSYS)
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return len;
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EBCASC (info->name, sizeof(info->name));
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len += sprintf(page + len, "\n");
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len += sprintf(page + len, "LPAR Number: %d\n",
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info->lpar_number);
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len += sprintf(page + len, "LPAR Characteristics: ");
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if (info->characteristics & LPAR_CHAR_DEDICATED)
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len += sprintf(page + len, "Dedicated ");
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if (info->characteristics & LPAR_CHAR_SHARED)
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len += sprintf(page + len, "Shared ");
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if (info->characteristics & LPAR_CHAR_LIMITED)
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len += sprintf(page + len, "Limited ");
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len += sprintf(page + len, "\n");
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len += sprintf(page + len, "LPAR Name: %-8.8s\n",
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info->name);
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len += sprintf(page + len, "LPAR Adjustment: %d\n",
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info->caf);
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len += sprintf(page + len, "LPAR CPUs Total: %d\n",
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info->cpus_total);
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len += sprintf(page + len, "LPAR CPUs Configured: %d\n",
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info->cpus_configured);
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len += sprintf(page + len, "LPAR CPUs Standby: %d\n",
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info->cpus_standby);
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len += sprintf(page + len, "LPAR CPUs Reserved: %d\n",
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info->cpus_reserved);
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len += sprintf(page + len, "LPAR CPUs Dedicated: %d\n",
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info->cpus_dedicated);
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len += sprintf(page + len, "LPAR CPUs Shared: %d\n",
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info->cpus_shared);
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return len;
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}
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static int stsi_3_2_2(struct sysinfo_3_2_2 *info, char *page, int len)
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{
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int i;
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if (stsi(info, 3, 2, 2) == -ENOSYS)
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return len;
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for (i = 0; i < info->count; i++) {
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EBCASC (info->vm[i].name, sizeof(info->vm[i].name));
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EBCASC (info->vm[i].cpi, sizeof(info->vm[i].cpi));
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len += sprintf(page + len, "\n");
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len += sprintf(page + len, "VM%02d Name: %-8.8s\n",
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i, info->vm[i].name);
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len += sprintf(page + len, "VM%02d Control Program: %-16.16s\n",
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i, info->vm[i].cpi);
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len += sprintf(page + len, "VM%02d Adjustment: %d\n",
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i, info->vm[i].caf);
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len += sprintf(page + len, "VM%02d CPUs Total: %d\n",
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i, info->vm[i].cpus_total);
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len += sprintf(page + len, "VM%02d CPUs Configured: %d\n",
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i, info->vm[i].cpus_configured);
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len += sprintf(page + len, "VM%02d CPUs Standby: %d\n",
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i, info->vm[i].cpus_standby);
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len += sprintf(page + len, "VM%02d CPUs Reserved: %d\n",
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i, info->vm[i].cpus_reserved);
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}
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return len;
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}
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static int proc_read_sysinfo(char *page, char **start,
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off_t off, int count,
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int *eof, void *data)
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{
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unsigned long info = get_zeroed_page (GFP_KERNEL);
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int level, len;
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if (!info)
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return 0;
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len = 0;
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level = stsi_0();
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if (level >= 1)
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len = stsi_1_1_1((struct sysinfo_1_1_1 *) info, page, len);
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if (level >= 1)
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len = stsi_1_2_2((struct sysinfo_1_2_2 *) info, page, len);
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if (level >= 2)
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len = stsi_2_2_2((struct sysinfo_2_2_2 *) info, page, len);
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if (level >= 3)
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len = stsi_3_2_2((struct sysinfo_3_2_2 *) info, page, len);
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free_page (info);
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return len;
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}
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static __init int create_proc_sysinfo(void)
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{
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create_proc_read_entry("sysinfo", 0444, NULL,
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proc_read_sysinfo, NULL);
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return 0;
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}
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__initcall(create_proc_sysinfo);
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int get_cpu_capability(unsigned int *capability)
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{
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struct sysinfo_1_2_2 *info;
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int rc;
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info = (void *) get_zeroed_page(GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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rc = stsi(info, 1, 2, 2);
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if (rc == -ENOSYS)
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goto out;
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rc = 0;
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*capability = info->capability;
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out:
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free_page((unsigned long) info);
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return rc;
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}
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/*
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* CPU capability might have changed. Therefore recalculate loops_per_jiffy.
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*/
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void s390_adjust_jiffies(void)
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{
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struct sysinfo_1_2_2 *info;
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const unsigned int fmil = 0x4b189680; /* 1e7 as 32-bit float. */
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FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR);
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FP_DECL_EX;
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unsigned int capability;
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info = (void *) get_zeroed_page(GFP_KERNEL);
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if (!info)
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return;
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if (stsi(info, 1, 2, 2) != -ENOSYS) {
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/*
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* Major sigh. The cpu capability encoding is "special".
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* If the first 9 bits of info->capability are 0 then it
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* is a 32 bit unsigned integer in the range 0 .. 2^23.
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* If the first 9 bits are != 0 then it is a 32 bit float.
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* In addition a lower value indicates a proportionally
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* higher cpu capacity. Bogomips are the other way round.
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* To get to a halfway suitable number we divide 1e7
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* by the cpu capability number. Yes, that means a floating
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* point division .. math-emu here we come :-)
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*/
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FP_UNPACK_SP(SA, &fmil);
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if ((info->capability >> 23) == 0)
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FP_FROM_INT_S(SB, info->capability, 32, int);
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else
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FP_UNPACK_SP(SB, &info->capability);
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FP_DIV_S(SR, SA, SB);
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FP_TO_INT_S(capability, SR, 32, 0);
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} else
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/*
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* Really old machine without stsi block for basic
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* cpu information. Report 42.0 bogomips.
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*/
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capability = 42;
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loops_per_jiffy = capability * (500000/HZ);
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free_page((unsigned long) info);
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}
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/*
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* calibrate the delay loop
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*/
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void __init calibrate_delay(void)
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{
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s390_adjust_jiffies();
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/* Print the good old Bogomips line .. */
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printk(KERN_DEBUG "Calibrating delay loop (skipped)... "
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"%lu.%02lu BogoMIPS preset\n", loops_per_jiffy/(500000/HZ),
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(loops_per_jiffy/(5000/HZ)) % 100);
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}
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