This source file includes following definitions.
- cpu_detect_mhz_feature
- update_cpu_mhz
- s390_update_cpu_mhz
- stop_machine_yield
- cpu_init
- cpu_have_feature
- show_facilities
- show_cpu_summary
- show_cpu_mhz
- show_cpuinfo
- c_update
- c_start
- c_next
- c_stop
- s390_isolate_bp
- s390_isolate_bp_guest
1
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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
28 struct cpu_info {
29 unsigned int cpu_mhz_dynamic;
30 unsigned int cpu_mhz_static;
31 struct cpuid cpu_id;
32 };
33
34 static DEFINE_PER_CPU(struct cpu_info, cpu_info);
35 static DEFINE_PER_CPU(int, cpu_relax_retry);
36
37 static bool machine_has_cpu_mhz;
38
39 void __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
45 static 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
56 void 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
63 void 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
80
81 void 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
96
97 int cpu_have_feature(unsigned int num)
98 {
99 return elf_hwcap & (1UL << num);
100 }
101 EXPORT_SYMBOL(cpu_have_feature);
102
103 static 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
115 static 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
154 static 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
164
165 static int show_cpuinfo(struct seq_file *m, void *v)
166 {
167 unsigned long n = (unsigned long) v - 1;
168 unsigned long first = cpumask_first(cpu_online_mask);
169
170 if (n == first)
171 show_cpu_summary(m, v);
172 if (!machine_has_cpu_mhz)
173 return 0;
174 seq_printf(m, "\ncpu number : %ld\n", n);
175 show_cpu_mhz(m, n);
176 return 0;
177 }
178
179 static inline void *c_update(loff_t *pos)
180 {
181 if (*pos)
182 *pos = cpumask_next(*pos - 1, cpu_online_mask);
183 else
184 *pos = cpumask_first(cpu_online_mask);
185 return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
186 }
187
188 static void *c_start(struct seq_file *m, loff_t *pos)
189 {
190 get_online_cpus();
191 return c_update(pos);
192 }
193
194 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
195 {
196 ++*pos;
197 return c_update(pos);
198 }
199
200 static void c_stop(struct seq_file *m, void *v)
201 {
202 put_online_cpus();
203 }
204
205 const struct seq_operations cpuinfo_op = {
206 .start = c_start,
207 .next = c_next,
208 .stop = c_stop,
209 .show = show_cpuinfo,
210 };
211
212 int s390_isolate_bp(void)
213 {
214 if (!test_facility(82))
215 return -EOPNOTSUPP;
216 set_thread_flag(TIF_ISOLATE_BP);
217 return 0;
218 }
219 EXPORT_SYMBOL(s390_isolate_bp);
220
221 int s390_isolate_bp_guest(void)
222 {
223 if (!test_facility(82))
224 return -EOPNOTSUPP;
225 set_thread_flag(TIF_ISOLATE_BP_GUEST);
226 return 0;
227 }
228 EXPORT_SYMBOL(s390_isolate_bp_guest);