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Linux/arch/s390/kernel/processor.c

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  1 /*
  2  *  Copyright IBM Corp. 2008
  3  *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
  4  */
  5 
  6 #define KMSG_COMPONENT "cpu"
  7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  8 
  9 #include <linux/cpufeature.h>
 10 #include <linux/kernel.h>
 11 #include <linux/init.h>
 12 #include <linux/seq_file.h>
 13 #include <linux/delay.h>
 14 #include <linux/cpu.h>
 15 #include <asm/diag.h>
 16 #include <asm/facility.h>
 17 #include <asm/elf.h>
 18 #include <asm/lowcore.h>
 19 #include <asm/param.h>
 20 #include <asm/smp.h>
 21 
 22 struct cpu_info {
 23         unsigned int cpu_mhz_dynamic;
 24         unsigned int cpu_mhz_static;
 25         struct cpuid cpu_id;
 26 };
 27 
 28 static DEFINE_PER_CPU(struct cpu_info, cpu_info);
 29 
 30 static bool machine_has_cpu_mhz;
 31 
 32 void __init cpu_detect_mhz_feature(void)
 33 {
 34         if (test_facility(34) && __ecag(ECAG_CPU_ATTRIBUTE, 0) != -1UL)
 35                 machine_has_cpu_mhz = 1;
 36 }
 37 
 38 static void update_cpu_mhz(void *arg)
 39 {
 40         unsigned long mhz;
 41         struct cpu_info *c;
 42 
 43         mhz = __ecag(ECAG_CPU_ATTRIBUTE, 0);
 44         c = this_cpu_ptr(&cpu_info);
 45         c->cpu_mhz_dynamic = mhz >> 32;
 46         c->cpu_mhz_static = mhz & 0xffffffff;
 47 }
 48 
 49 void s390_update_cpu_mhz(void)
 50 {
 51         s390_adjust_jiffies();
 52         if (machine_has_cpu_mhz)
 53                 on_each_cpu(update_cpu_mhz, NULL, 0);
 54 }
 55 
 56 void notrace cpu_relax(void)
 57 {
 58         if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) {
 59                 diag_stat_inc(DIAG_STAT_X044);
 60                 asm volatile("diag 0,0,0x44");
 61         }
 62         barrier();
 63 }
 64 EXPORT_SYMBOL(cpu_relax);
 65 
 66 /*
 67  * cpu_init - initializes state that is per-CPU.
 68  */
 69 void cpu_init(void)
 70 {
 71         struct cpuid *id = this_cpu_ptr(&cpu_info.cpu_id);
 72 
 73         get_cpu_id(id);
 74         if (machine_has_cpu_mhz)
 75                 update_cpu_mhz(NULL);
 76         atomic_inc(&init_mm.mm_count);
 77         current->active_mm = &init_mm;
 78         BUG_ON(current->mm);
 79         enter_lazy_tlb(&init_mm, current);
 80 }
 81 
 82 /*
 83  * cpu_have_feature - Test CPU features on module initialization
 84  */
 85 int cpu_have_feature(unsigned int num)
 86 {
 87         return elf_hwcap & (1UL << num);
 88 }
 89 EXPORT_SYMBOL(cpu_have_feature);
 90 
 91 static void show_cpu_summary(struct seq_file *m, void *v)
 92 {
 93         static const char *hwcap_str[] = {
 94                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 95                 "edat", "etf3eh", "highgprs", "te", "vx"
 96         };
 97         static const char * const int_hwcap_str[] = {
 98                 "sie"
 99         };
100         int i, cpu;
101 
102         seq_printf(m, "vendor_id       : IBM/S390\n"
103                    "# processors    : %i\n"
104                    "bogomips per cpu: %lu.%02lu\n",
105                    num_online_cpus(), loops_per_jiffy/(500000/HZ),
106                    (loops_per_jiffy/(5000/HZ))%100);
107         seq_printf(m, "max thread id   : %d\n", smp_cpu_mtid);
108         seq_puts(m, "features\t: ");
109         for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
110                 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
111                         seq_printf(m, "%s ", hwcap_str[i]);
112         for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++)
113                 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
114                         seq_printf(m, "%s ", int_hwcap_str[i]);
115         seq_puts(m, "\n");
116         show_cacheinfo(m);
117         for_each_online_cpu(cpu) {
118                 struct cpuid *id = &per_cpu(cpu_info.cpu_id, cpu);
119 
120                 seq_printf(m, "processor %d: "
121                            "version = %02X,  "
122                            "identification = %06X,  "
123                            "machine = %04X\n",
124                            cpu, id->version, id->ident, id->machine);
125         }
126 }
127 
128 static void show_cpu_mhz(struct seq_file *m, unsigned long n)
129 {
130         struct cpu_info *c = per_cpu_ptr(&cpu_info, n);
131 
132         seq_printf(m, "cpu MHz dynamic : %d\n", c->cpu_mhz_dynamic);
133         seq_printf(m, "cpu MHz static  : %d\n", c->cpu_mhz_static);
134 }
135 
136 /*
137  * show_cpuinfo - Get information on one CPU for use by procfs.
138  */
139 static int show_cpuinfo(struct seq_file *m, void *v)
140 {
141         unsigned long n = (unsigned long) v - 1;
142 
143         if (!n)
144                 show_cpu_summary(m, v);
145         if (!machine_has_cpu_mhz)
146                 return 0;
147         seq_printf(m, "\ncpu number      : %ld\n", n);
148         show_cpu_mhz(m, n);
149         return 0;
150 }
151 
152 static inline void *c_update(loff_t *pos)
153 {
154         if (*pos)
155                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
156         return *pos < nr_cpu_ids ? (void *)*pos + 1 : NULL;
157 }
158 
159 static void *c_start(struct seq_file *m, loff_t *pos)
160 {
161         get_online_cpus();
162         return c_update(pos);
163 }
164 
165 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
166 {
167         ++*pos;
168         return c_update(pos);
169 }
170 
171 static void c_stop(struct seq_file *m, void *v)
172 {
173         put_online_cpus();
174 }
175 
176 const struct seq_operations cpuinfo_op = {
177         .start  = c_start,
178         .next   = c_next,
179         .stop   = c_stop,
180         .show   = show_cpuinfo,
181 };
182 

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