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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
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
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
107 seq_puts(m, "facilities :");
108 for_each_set_bit_inv(bit, (long *)&stfle_fac_list, MAX_FACILITY_BIT)
109 seq_printf(m, " %d", bit);
110 seq_putc(m, '\n');
111}
112
113static void show_cpu_summary(struct seq_file *m, void *v)
114{
115 static const char *hwcap_str[] = {
116 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
117 "edat", "etf3eh", "highgprs", "te", "vx", "vxd", "vxe", "gs",
118 "vxe2", "vxp", "sort", "dflt"
119 };
120 static const char * const int_hwcap_str[] = {
121 "sie"
122 };
123 int i, cpu;
124
125 seq_printf(m, "vendor_id : IBM/S390\n"
126 "# processors : %i\n"
127 "bogomips per cpu: %lu.%02lu\n",
128 num_online_cpus(), loops_per_jiffy/(500000/HZ),
129 (loops_per_jiffy/(5000/HZ))%100);
130 seq_printf(m, "max thread id : %d\n", smp_cpu_mtid);
131 seq_puts(m, "features\t: ");
132 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
133 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
134 seq_printf(m, "%s ", hwcap_str[i]);
135 for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++)
136 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
137 seq_printf(m, "%s ", int_hwcap_str[i]);
138 seq_puts(m, "\n");
139 show_facilities(m);
140 show_cacheinfo(m);
141 for_each_online_cpu(cpu) {
142 struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
143
144 seq_printf(m, "processor %d: "
145 "version = %02X, "
146 "identification = %06X, "
147 "machine = %04X\n",
148 cpu, id->version, id->ident, id->machine);
149 }
150}
151
152static void show_cpu_topology(struct seq_file *m, unsigned long n)
153{
154#ifdef CONFIG_SCHED_TOPOLOGY
155 seq_printf(m, "physical id : %d\n", topology_physical_package_id(n));
156 seq_printf(m, "core id : %d\n", topology_core_id(n));
157 seq_printf(m, "book id : %d\n", topology_book_id(n));
158 seq_printf(m, "drawer id : %d\n", topology_drawer_id(n));
159 seq_printf(m, "dedicated : %d\n", topology_cpu_dedicated(n));
160 seq_printf(m, "address : %d\n", smp_cpu_get_cpu_address(n));
161 seq_printf(m, "siblings : %d\n", cpumask_weight(topology_core_cpumask(n)));
162 seq_printf(m, "cpu cores : %d\n", topology_booted_cores(n));
163#endif
164}
165
166static void show_cpu_ids(struct seq_file *m, unsigned long n)
167{
168 struct cpuid *id = &per_cpu(cpu_info.cpu_id, n);
169
170 seq_printf(m, "version : %02X\n", id->version);
171 seq_printf(m, "identification : %06X\n", id->ident);
172 seq_printf(m, "machine : %04X\n", id->machine);
173}
174
175static void show_cpu_mhz(struct seq_file *m, unsigned long n)
176{
177 struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
178
179 if (!machine_has_cpu_mhz)
180 return;
181 seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
182 seq_printf(m, "cpu MHz static : %d\n", c->cpu_mhz_static);
183}
184
185
186
187
188static int show_cpuinfo(struct seq_file *m, void *v)
189{
190 unsigned long n = (unsigned long) v - 1;
191 unsigned long first = cpumask_first(cpu_online_mask);
192
193 if (n == first)
194 show_cpu_summary(m, v);
195 seq_printf(m, "\ncpu number : %ld\n", n);
196 show_cpu_topology(m, n);
197 show_cpu_ids(m, n);
198 show_cpu_mhz(m, n);
199 return 0;
200}
201
202static inline void *c_update(loff_t *pos)
203{
204 if (*pos)
205 *pos = cpumask_next(*pos - 1, cpu_online_mask);
206 else
207 *pos = cpumask_first(cpu_online_mask);
208 return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
209}
210
211static void *c_start(struct seq_file *m, loff_t *pos)
212{
213 get_online_cpus();
214 return c_update(pos);
215}
216
217static void *c_next(struct seq_file *m, void *v, loff_t *pos)
218{
219 ++*pos;
220 return c_update(pos);
221}
222
223static void c_stop(struct seq_file *m, void *v)
224{
225 put_online_cpus();
226}
227
228const struct seq_operations cpuinfo_op = {
229 .start = c_start,
230 .next = c_next,
231 .stop = c_stop,
232 .show = show_cpuinfo,
233};
234
235int s390_isolate_bp(void)
236{
237 if (!test_facility(82))
238 return -EOPNOTSUPP;
239 set_thread_flag(TIF_ISOLATE_BP);
240 return 0;
241}
242EXPORT_SYMBOL(s390_isolate_bp);
243
244int s390_isolate_bp_guest(void)
245{
246 if (!test_facility(82))
247 return -EOPNOTSUPP;
248 set_thread_flag(TIF_ISOLATE_BP_GUEST);
249 return 0;
250}
251EXPORT_SYMBOL(s390_isolate_bp_guest);
252
