fade4dc491
The maximum nesting of the cpu topology is evaluated when /proc/sysinfo is the first time read. This happens without a lock and a concurrent reader on a different cpu can see and use an invalid intermediate value. Besides the fact that this race is quite unlikely the worst thing that could happen is that /proc/sysinfo would contain bogus information about the machine's cpu topology. Nevertheless this should be fixed. So move the detection code to the early machine detection code and since now the value is early available use it in the topology code as well. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
184 lines
3.9 KiB
C
184 lines
3.9 KiB
C
/*
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* definition for store system information stsi
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*
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* Copyright IBM Corp. 2001, 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Ulrich Weigand <weigand@de.ibm.com>
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* Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#ifndef __ASM_S390_SYSINFO_H
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#define __ASM_S390_SYSINFO_H
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#include <asm/bitsperlong.h>
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struct sysinfo_1_1_1 {
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unsigned char p:1;
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unsigned char :6;
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unsigned char t:1;
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unsigned char :8;
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unsigned char ccr;
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unsigned char cai;
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char reserved_0[28];
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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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char model_perm_cap[16];
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char model_temp_cap[16];
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unsigned int model_cap_rating;
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unsigned int model_perm_cap_rating;
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unsigned int model_temp_cap_rating;
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unsigned char typepct[5];
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unsigned char reserved_2[3];
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unsigned int ncr;
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unsigned int npr;
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unsigned int ntr;
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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[20];
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unsigned int nominal_cap;
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unsigned int secondary_cap;
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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 :4;
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unsigned char count:4;
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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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char reserved_544[3552];
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};
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extern int topology_max_mnest;
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#define TOPOLOGY_CPU_BITS 64
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#define TOPOLOGY_NR_MAG 6
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struct topology_cpu {
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unsigned char reserved0[4];
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unsigned char :6;
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unsigned char pp:2;
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unsigned char reserved1;
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unsigned short origin;
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unsigned long mask[TOPOLOGY_CPU_BITS / BITS_PER_LONG];
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};
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struct topology_container {
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unsigned char reserved[7];
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unsigned char id;
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};
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union topology_entry {
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unsigned char nl;
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struct topology_cpu cpu;
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struct topology_container container;
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};
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struct sysinfo_15_1_x {
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unsigned char reserved0[2];
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unsigned short length;
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unsigned char mag[TOPOLOGY_NR_MAG];
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unsigned char reserved1;
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unsigned char mnest;
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unsigned char reserved2[4];
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union topology_entry tle[0];
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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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/*
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* Service level reporting interface.
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*/
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struct service_level {
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struct list_head list;
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void (*seq_print)(struct seq_file *, struct service_level *);
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};
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int register_service_level(struct service_level *);
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int unregister_service_level(struct service_level *);
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#endif /* __ASM_S390_SYSINFO_H */
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