Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2008
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
5 */
6
7#define KMSG_COMPONENT "cpu"
8#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10#include <linux/stop_machine.h>
11#include <linux/cpufeature.h>
12#include <linux/bitops.h>
13#include <linux/kernel.h>
14#include <linux/sched/mm.h>
15#include <linux/init.h>
16#include <linux/seq_file.h>
17#include <linux/mm_types.h>
18#include <linux/delay.h>
19#include <linux/cpu.h>
20
21#include <asm/diag.h>
22#include <asm/facility.h>
23#include <asm/elf.h>
24#include <asm/lowcore.h>
25#include <asm/param.h>
26#include <asm/smp.h>
27
28struct cpu_info {
29 unsigned int cpu_mhz_dynamic;
30 unsigned int cpu_mhz_static;
31 struct cpuid cpu_id;
32};
33
34static DEFINE_PER_CPU(struct cpu_info, cpu_info);
35static DEFINE_PER_CPU(int, cpu_relax_retry);
36
37static bool machine_has_cpu_mhz;
38
39void __init cpu_detect_mhz_feature(void)
40{
41 if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL)
42 machine_has_cpu_mhz = true;
43}
44
45static void update_cpu_mhz(void *arg)
46{
47 unsigned long mhz;
48 struct cpu_info *c;
49
50 mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0);
51 c = this_cpu_ptr(&cpu_info);
52 c->cpu_mhz_dynamic = mhz >> 32;
53 c->cpu_mhz_static = mhz & 0xffffffff;
54}
55
56void s390_update_cpu_mhz(void)
57{
58 s390_adjust_jiffies();
59 if (machine_has_cpu_mhz)
60 on_each_cpu(update_cpu_mhz, NULL, 0);
61}
62
63void notrace stop_machine_yield(const struct cpumask *cpumask)
64{
65 int cpu, this_cpu;
66
67 this_cpu = smp_processor_id();
68 if (__this_cpu_inc_return(cpu_relax_retry) >= spin_retry) {
69 __this_cpu_write(cpu_relax_retry, 0);
70 cpu = cpumask_next_wrap(this_cpu, cpumask, this_cpu, false);
71 if (cpu >= nr_cpu_ids)
72 return;
73 if (arch_vcpu_is_preempted(cpu))
74 smp_yield_cpu(cpu);
75 }
76}
77
78/*
79 * cpu_init - initializes state that is per-CPU.
80 */
81void cpu_init(void)
82{
83 struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
84
85 get_cpu_id(id);
86 if (machine_has_cpu_mhz)
87 update_cpu_mhz(NULL);
88 mmgrab(&init_mm);
89 current->active_mm = &init_mm;
90 BUG_ON(current->mm);
91 enter_lazy_tlb(&init_mm, current);
92}
93
94/*
95 * cpu_have_feature - Test CPU features on module initialization
96 */
97int cpu_have_feature(unsigned int num)
98{
99 return elf_hwcap & (1UL << num);
100}
101EXPORT_SYMBOL(cpu_have_feature);
102
103static void show_facilities(struct seq_file *m)
104{
105 unsigned int bit;
106 long *facilities;
107
108 facilities = (long *)&S390_lowcore.stfle_fac_list;
109 seq_puts(m, "facilities :");
110 for_each_set_bit_inv(bit, facilities, MAX_FACILITY_BIT)
111 seq_printf(m, " %d", bit);
112 seq_putc(m, '\n');
113}
114
115static void show_cpu_summary(struct seq_file *m, void *v)
116{
117 static const char *hwcap_str[] = {
118 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
119 "edat", "etf3eh", "highgprs", "te", "vx", "vxd", "vxe", "gs",
120 "vxe2", "vxp", "sort", "dflt"
121 };
122 static const char * const int_hwcap_str[] = {
123 "sie"
124 };
125 int i, cpu;
126
127 seq_printf(m, "vendor_id : IBM/S390\n"
128 "# processors : %i\n"
129 "bogomips per cpu: %lu.%02lu\n",
130 num_online_cpus(), loops_per_jiffy/(500000/HZ),
131 (loops_per_jiffy/(5000/HZ))%100);
132 seq_printf(m, "max thread id : %d\n", smp_cpu_mtid);
133 seq_puts(m, "features\t: ");
134 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
135 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
136 seq_printf(m, "%s ", hwcap_str[i]);
137 for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++)
138 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
139 seq_printf(m, "%s ", int_hwcap_str[i]);
140 seq_puts(m, "\n");
141 show_facilities(m);
142 show_cacheinfo(m);
143 for_each_online_cpu(cpu) {
144 struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
145
146 seq_printf(m, "processor %d: "
147 "version = %02X, "
148 "identification = %06X, "
149 "machine = %04X\n",
150 cpu, id->version, id->ident, id->machine);
151 }
152}
153
154static void show_cpu_mhz(struct seq_file *m, unsigned long n)
155{
156 struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
157
158 seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
159 seq_printf(m, "cpu MHz static : %d\n", c->cpu_mhz_static);
160}
161
162/*
163 * show_cpuinfo - Get information on one CPU for use by procfs.
164 */
165static int show_cpuinfo(struct seq_file *m, void *v)
166{
167 unsigned long n = (unsigned long) v - 1;
168
169 if (!n)
170 show_cpu_summary(m, v);
171 if (!machine_has_cpu_mhz)
172 return 0;
173 seq_printf(m, "\ncpu number : %ld\n", n);
174 show_cpu_mhz(m, n);
175 return 0;
176}
177
178static inline void *c_update(loff_t *pos)
179{
180 if (*pos)
181 *pos = cpumask_next(*pos - 1, cpu_online_mask);
182 return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
183}
184
185static void *c_start(struct seq_file *m, loff_t *pos)
186{
187 get_online_cpus();
188 return c_update(pos);
189}
190
191static void *c_next(struct seq_file *m, void *v, loff_t *pos)
192{
193 ++*pos;
194 return c_update(pos);
195}
196
197static void c_stop(struct seq_file *m, void *v)
198{
199 put_online_cpus();
200}
201
202const struct seq_operations cpuinfo_op = {
203 .start = c_start,
204 .next = c_next,
205 .stop = c_stop,
206 .show = show_cpuinfo,
207};
208
209int s390_isolate_bp(void)
210{
211 if (!test_facility(82))
212 return -EOPNOTSUPP;
213 set_thread_flag(TIF_ISOLATE_BP);
214 return 0;
215}
216EXPORT_SYMBOL(s390_isolate_bp);
217
218int s390_isolate_bp_guest(void)
219{
220 if (!test_facility(82))
221 return -EOPNOTSUPP;
222 set_thread_flag(TIF_ISOLATE_BP_GUEST);
223 return 0;
224}
225EXPORT_SYMBOL(s390_isolate_bp_guest);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2008
4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
5 */
6
7#define KMSG_COMPONENT "cpu"
8#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9
10#include <linux/cpufeature.h>
11#include <linux/bitops.h>
12#include <linux/kernel.h>
13#include <linux/sched/mm.h>
14#include <linux/init.h>
15#include <linux/seq_file.h>
16#include <linux/mm_types.h>
17#include <linux/delay.h>
18#include <linux/cpu.h>
19
20#include <asm/diag.h>
21#include <asm/facility.h>
22#include <asm/elf.h>
23#include <asm/lowcore.h>
24#include <asm/param.h>
25#include <asm/smp.h>
26
27struct cpu_info {
28 unsigned int cpu_mhz_dynamic;
29 unsigned int cpu_mhz_static;
30 struct cpuid cpu_id;
31};
32
33static DEFINE_PER_CPU(struct cpu_info, cpu_info);
34
35static bool machine_has_cpu_mhz;
36
37void __init cpu_detect_mhz_feature(void)
38{
39 if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL)
40 machine_has_cpu_mhz = true;
41}
42
43static void update_cpu_mhz(void *arg)
44{
45 unsigned long mhz;
46 struct cpu_info *c;
47
48 mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0);
49 c = this_cpu_ptr(&cpu_info);
50 c->cpu_mhz_dynamic = mhz >> 32;
51 c->cpu_mhz_static = mhz & 0xffffffff;
52}
53
54void s390_update_cpu_mhz(void)
55{
56 s390_adjust_jiffies();
57 if (machine_has_cpu_mhz)
58 on_each_cpu(update_cpu_mhz, NULL, 0);
59}
60
61void notrace cpu_relax_yield(void)
62{
63 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) {
64 diag_stat_inc(DIAG_STAT_X044);
65 asm volatile("diag 0,0,0x44");
66 }
67 barrier();
68}
69EXPORT_SYMBOL(cpu_relax_yield);
70
71/*
72 * cpu_init - initializes state that is per-CPU.
73 */
74void cpu_init(void)
75{
76 struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
77
78 get_cpu_id(id);
79 if (machine_has_cpu_mhz)
80 update_cpu_mhz(NULL);
81 mmgrab(&init_mm);
82 current->active_mm = &init_mm;
83 BUG_ON(current->mm);
84 enter_lazy_tlb(&init_mm, current);
85}
86
87/*
88 * cpu_have_feature - Test CPU features on module initialization
89 */
90int cpu_have_feature(unsigned int num)
91{
92 return elf_hwcap & (1UL << num);
93}
94EXPORT_SYMBOL(cpu_have_feature);
95
96static void show_facilities(struct seq_file *m)
97{
98 unsigned int bit;
99 long *facilities;
100
101 facilities = (long *)&S390_lowcore.stfle_fac_list;
102 seq_puts(m, "facilities :");
103 for_each_set_bit_inv(bit, facilities, MAX_FACILITY_BIT)
104 seq_printf(m, " %d", bit);
105 seq_putc(m, '\n');
106}
107
108static void show_cpu_summary(struct seq_file *m, void *v)
109{
110 static const char *hwcap_str[] = {
111 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
112 "edat", "etf3eh", "highgprs", "te", "vx", "vxd", "vxe", "gs"
113 };
114 static const char * const int_hwcap_str[] = {
115 "sie"
116 };
117 int i, cpu;
118
119 seq_printf(m, "vendor_id : IBM/S390\n"
120 "# processors : %i\n"
121 "bogomips per cpu: %lu.%02lu\n",
122 num_online_cpus(), loops_per_jiffy/(500000/HZ),
123 (loops_per_jiffy/(5000/HZ))%100);
124 seq_printf(m, "max thread id : %d\n", smp_cpu_mtid);
125 seq_puts(m, "features\t: ");
126 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
127 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
128 seq_printf(m, "%s ", hwcap_str[i]);
129 for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++)
130 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
131 seq_printf(m, "%s ", int_hwcap_str[i]);
132 seq_puts(m, "\n");
133 show_facilities(m);
134 show_cacheinfo(m);
135 for_each_online_cpu(cpu) {
136 struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
137
138 seq_printf(m, "processor %d: "
139 "version = %02X, "
140 "identification = %06X, "
141 "machine = %04X\n",
142 cpu, id->version, id->ident, id->machine);
143 }
144}
145
146static void show_cpu_mhz(struct seq_file *m, unsigned long n)
147{
148 struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
149
150 seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
151 seq_printf(m, "cpu MHz static : %d\n", c->cpu_mhz_static);
152}
153
154/*
155 * show_cpuinfo - Get information on one CPU for use by procfs.
156 */
157static int show_cpuinfo(struct seq_file *m, void *v)
158{
159 unsigned long n = (unsigned long) v - 1;
160
161 if (!n)
162 show_cpu_summary(m, v);
163 if (!machine_has_cpu_mhz)
164 return 0;
165 seq_printf(m, "\ncpu number : %ld\n", n);
166 show_cpu_mhz(m, n);
167 return 0;
168}
169
170static inline void *c_update(loff_t *pos)
171{
172 if (*pos)
173 *pos = cpumask_next(*pos - 1, cpu_online_mask);
174 return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
175}
176
177static void *c_start(struct seq_file *m, loff_t *pos)
178{
179 get_online_cpus();
180 return c_update(pos);
181}
182
183static void *c_next(struct seq_file *m, void *v, loff_t *pos)
184{
185 ++*pos;
186 return c_update(pos);
187}
188
189static void c_stop(struct seq_file *m, void *v)
190{
191 put_online_cpus();
192}
193
194const struct seq_operations cpuinfo_op = {
195 .start = c_start,
196 .next = c_next,
197 .stop = c_stop,
198 .show = show_cpuinfo,
199};
200
201int s390_isolate_bp(void)
202{
203 if (!test_facility(82))
204 return -EOPNOTSUPP;
205 set_thread_flag(TIF_ISOLATE_BP);
206 return 0;
207}
208EXPORT_SYMBOL(s390_isolate_bp);
209
210int s390_isolate_bp_guest(void)
211{
212 if (!test_facility(82))
213 return -EOPNOTSUPP;
214 set_thread_flag(TIF_ISOLATE_BP_GUEST);
215 return 0;
216}
217EXPORT_SYMBOL(s390_isolate_bp_guest);