arch/sparc/kernel/sysfs.c

   1 /* sysfs.c: Toplogy sysfs support code for sparc64.
   2  *
   3  * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
   4  */
   5 #include <linux/sched.h>
   6 #include <linux/sysdev.h>
   7 #include <linux/cpu.h>
   8 #include <linux/smp.h>
   9 #include <linux/percpu.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/cpudata.h>
  13 #include <asm/hypervisor.h>
  14 #include <asm/spitfire.h>
  15
  16 static DEFINE_PER_CPU(struct hv_mmu_statistics, mmu_stats) __attribute__((aligned(64)));
  17
  18 #define SHOW_MMUSTAT_ULONG(NAME) \
  19 static ssize_t show_##NAME(struct sys_device *dev, \
  20                         struct sysdev_attribute *attr, char *buf) \
  21 { \
  22         struct hv_mmu_statistics *p = &per_cpu(mmu_stats, dev->id); \
  23         return sprintf(buf, "%lu\n", p->NAME); \
  24 } \
  25 static SYSDEV_ATTR(NAME, 0444, show_##NAME, NULL)
  26
  27 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_8k_tte);
  28 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_8k_tte);
  29 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_64k_tte);
  30 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_64k_tte);
  31 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_4mb_tte);
  32 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_4mb_tte);
  33 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_256mb_tte);
  34 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_256mb_tte);
  35 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_8k_tte);
  36 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_8k_tte);
  37 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_64k_tte);
  38 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_64k_tte);
  39 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_4mb_tte);
  40 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_4mb_tte);
  41 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_256mb_tte);
  42 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_256mb_tte);
  43 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_8k_tte);
  44 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_8k_tte);
  45 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_64k_tte);
  46 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_64k_tte);
  47 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_4mb_tte);
  48 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_4mb_tte);
  49 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_256mb_tte);
  50 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_256mb_tte);
  51 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_8k_tte);
  52 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_8k_tte);
  53 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_64k_tte);
  54 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_64k_tte);
  55 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_4mb_tte);
  56 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_4mb_tte);
  57 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_256mb_tte);
  58 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_256mb_tte);
  59
  60 static struct attribute *mmu_stat_attrs[] = {
  61         &attr_immu_tsb_hits_ctx0_8k_tte.attr,
  62         &attr_immu_tsb_ticks_ctx0_8k_tte.attr,
  63         &attr_immu_tsb_hits_ctx0_64k_tte.attr,
  64         &attr_immu_tsb_ticks_ctx0_64k_tte.attr,
  65         &attr_immu_tsb_hits_ctx0_4mb_tte.attr,
  66         &attr_immu_tsb_ticks_ctx0_4mb_tte.attr,
  67         &attr_immu_tsb_hits_ctx0_256mb_tte.attr,
  68         &attr_immu_tsb_ticks_ctx0_256mb_tte.attr,
  69         &attr_immu_tsb_hits_ctxnon0_8k_tte.attr,
  70         &attr_immu_tsb_ticks_ctxnon0_8k_tte.attr,
  71         &attr_immu_tsb_hits_ctxnon0_64k_tte.attr,
  72         &attr_immu_tsb_ticks_ctxnon0_64k_tte.attr,
  73         &attr_immu_tsb_hits_ctxnon0_4mb_tte.attr,
  74         &attr_immu_tsb_ticks_ctxnon0_4mb_tte.attr,
  75         &attr_immu_tsb_hits_ctxnon0_256mb_tte.attr,
  76         &attr_immu_tsb_ticks_ctxnon0_256mb_tte.attr,
  77         &attr_dmmu_tsb_hits_ctx0_8k_tte.attr,
  78         &attr_dmmu_tsb_ticks_ctx0_8k_tte.attr,
  79         &attr_dmmu_tsb_hits_ctx0_64k_tte.attr,
  80         &attr_dmmu_tsb_ticks_ctx0_64k_tte.attr,
  81         &attr_dmmu_tsb_hits_ctx0_4mb_tte.attr,
  82         &attr_dmmu_tsb_ticks_ctx0_4mb_tte.attr,
  83         &attr_dmmu_tsb_hits_ctx0_256mb_tte.attr,
  84         &attr_dmmu_tsb_ticks_ctx0_256mb_tte.attr,
  85         &attr_dmmu_tsb_hits_ctxnon0_8k_tte.attr,
  86         &attr_dmmu_tsb_ticks_ctxnon0_8k_tte.attr,
  87         &attr_dmmu_tsb_hits_ctxnon0_64k_tte.attr,
  88         &attr_dmmu_tsb_ticks_ctxnon0_64k_tte.attr,
  89         &attr_dmmu_tsb_hits_ctxnon0_4mb_tte.attr,
  90         &attr_dmmu_tsb_ticks_ctxnon0_4mb_tte.attr,
  91         &attr_dmmu_tsb_hits_ctxnon0_256mb_tte.attr,
  92         &attr_dmmu_tsb_ticks_ctxnon0_256mb_tte.attr,
  93         NULL,
  94 };
  95
  96 static struct attribute_group mmu_stat_group = {
  97         .attrs = mmu_stat_attrs,
  98         .name = "mmu_stats",
  99 };
 100
 101 /* XXX convert to rusty's on_one_cpu */
 102 static unsigned long run_on_cpu(unsigned long cpu,
 103                                 unsigned long (*func)(unsigned long),
 104                                 unsigned long arg)
 105 {
 106         cpumask_t old_affinity = current->cpus_allowed;
 107         unsigned long ret;
 108
 109         /* should return -EINVAL to userspace */
 110         if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
 111                 return 0;
 112
 113         ret = func(arg);
 114
 115         set_cpus_allowed(current, old_affinity);
 116
 117         return ret;
 118 }
 119
 120 static unsigned long read_mmustat_enable(unsigned long junk)
 121 {
 122         unsigned long ra = 0;
 123
 124         sun4v_mmustat_info(&ra);
 125
 126         return ra != 0;
 127 }
 128
 129 static unsigned long write_mmustat_enable(unsigned long val)
 130 {
 131         unsigned long ra, orig_ra;
 132
 133         if (val)
 134                 ra = __pa(&per_cpu(mmu_stats, smp_processor_id()));
 135         else
 136                 ra = 0UL;
 137
 138         return sun4v_mmustat_conf(ra, &orig_ra);
 139 }
 140
 141 static ssize_t show_mmustat_enable(struct sys_device *s,
 142                                 struct sysdev_attribute *attr, char *buf)
 143 {
 144         unsigned long val = run_on_cpu(s->id, read_mmustat_enable, 0);
 145         return sprintf(buf, "%lx\n", val);
 146 }
 147
 148 static ssize_t store_mmustat_enable(struct sys_device *s,
 149                         struct sysdev_attribute *attr, const char *buf,
 150                         size_t count)
 151 {
 152         unsigned long val, err;
 153         int ret = sscanf(buf, "%ld", &val);
 154
 155         if (ret != 1)
 156                 return -EINVAL;
 157
 158         err = run_on_cpu(s->id, write_mmustat_enable, val);
 159         if (err)
 160                 return -EIO;
 161
 162         return count;
 163 }
 164
 165 static SYSDEV_ATTR(mmustat_enable, 0644, show_mmustat_enable, store_mmustat_enable);
 166
 167 static int mmu_stats_supported;
 168
 169 static int register_mmu_stats(struct sys_device *s)
 170 {
 171         if (!mmu_stats_supported)
 172                 return 0;
 173         sysdev_create_file(s, &attr_mmustat_enable);
 174         return sysfs_create_group(&s->kobj, &mmu_stat_group);
 175 }
 176
 177 #ifdef CONFIG_HOTPLUG_CPU
 178 static void unregister_mmu_stats(struct sys_device *s)
 179 {
 180         if (!mmu_stats_supported)
 181                 return;
 182         sysfs_remove_group(&s->kobj, &mmu_stat_group);
 183         sysdev_remove_file(s, &attr_mmustat_enable);
 184 }
 185 #endif
 186
 187 #define SHOW_CPUDATA_ULONG_NAME(NAME, MEMBER) \
 188 static ssize_t show_##NAME(struct sys_device *dev, \
 189                 struct sysdev_attribute *attr, char *buf) \
 190 { \
 191         cpuinfo_sparc *c = &cpu_data(dev->id); \
 192         return sprintf(buf, "%lu\n", c->MEMBER); \
 193 }
 194
 195 #define SHOW_CPUDATA_UINT_NAME(NAME, MEMBER) \
 196 static ssize_t show_##NAME(struct sys_device *dev, \
 197                 struct sysdev_attribute *attr, char *buf) \
 198 { \
 199         cpuinfo_sparc *c = &cpu_data(dev->id); \
 200         return sprintf(buf, "%u\n", c->MEMBER); \
 201 }
 202
 203 SHOW_CPUDATA_ULONG_NAME(clock_tick, clock_tick);
 204 SHOW_CPUDATA_UINT_NAME(l1_dcache_size, dcache_size);
 205 SHOW_CPUDATA_UINT_NAME(l1_dcache_line_size, dcache_line_size);
 206 SHOW_CPUDATA_UINT_NAME(l1_icache_size, icache_size);
 207 SHOW_CPUDATA_UINT_NAME(l1_icache_line_size, icache_line_size);
 208 SHOW_CPUDATA_UINT_NAME(l2_cache_size, ecache_size);
 209 SHOW_CPUDATA_UINT_NAME(l2_cache_line_size, ecache_line_size);
 210
 211 static struct sysdev_attribute cpu_core_attrs[] = {
 212         _SYSDEV_ATTR(clock_tick,          0444, show_clock_tick, NULL),
 213         _SYSDEV_ATTR(l1_dcache_size,      0444, show_l1_dcache_size, NULL),
 214         _SYSDEV_ATTR(l1_dcache_line_size, 0444, show_l1_dcache_line_size, NULL),
 215         _SYSDEV_ATTR(l1_icache_size,      0444, show_l1_icache_size, NULL),
 216         _SYSDEV_ATTR(l1_icache_line_size, 0444, show_l1_icache_line_size, NULL),
 217         _SYSDEV_ATTR(l2_cache_size,       0444, show_l2_cache_size, NULL),
 218         _SYSDEV_ATTR(l2_cache_line_size,  0444, show_l2_cache_line_size, NULL),
 219 };
 220
 221 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 222
 223 static void register_cpu_online(unsigned int cpu)
 224 {
 225         struct cpu *c = &per_cpu(cpu_devices, cpu);
 226         struct sys_device *s = &c->sysdev;
 227         int i;
 228
 229         for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
 230                 sysdev_create_file(s, &cpu_core_attrs[i]);
 231
 232         register_mmu_stats(s);
 233 }
 234
 235 #ifdef CONFIG_HOTPLUG_CPU
 236 static void unregister_cpu_online(unsigned int cpu)
 237 {
 238         struct cpu *c = &per_cpu(cpu_devices, cpu);
 239         struct sys_device *s = &c->sysdev;
 240         int i;
 241
 242         unregister_mmu_stats(s);
 243         for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
 244                 sysdev_remove_file(s, &cpu_core_attrs[i]);
 245 }
 246 #endif
 247
 248 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
 249                                       unsigned long action, void *hcpu)
 250 {
 251         unsigned int cpu = (unsigned int)(long)hcpu;
 252
 253         switch (action) {
 254         case CPU_ONLINE:
 255         case CPU_ONLINE_FROZEN:
 256                 register_cpu_online(cpu);
 257                 break;
 258 #ifdef CONFIG_HOTPLUG_CPU
 259         case CPU_DEAD:
 260         case CPU_DEAD_FROZEN:
 261                 unregister_cpu_online(cpu);
 262                 break;
 263 #endif
 264         }
 265         return NOTIFY_OK;
 266 }
 267
 268 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
 269         .notifier_call  = sysfs_cpu_notify,
 270 };
 271
 272 static void __init check_mmu_stats(void)
 273 {
 274         unsigned long dummy1, err;
 275
 276         if (tlb_type != hypervisor)
 277                 return;
 278
 279         err = sun4v_mmustat_info(&dummy1);
 280         if (!err)
 281                 mmu_stats_supported = 1;
 282 }
 283
 284 static void register_nodes(void)
 285 {
 286 #ifdef CONFIG_NUMA
 287         int i;
 288
 289         for (i = 0; i < MAX_NUMNODES; i++)
 290                 register_one_node(i);
 291 #endif
 292 }
 293
 294 static int __init topology_init(void)
 295 {
 296         int cpu;
 297
 298         register_nodes();
 299
 300         check_mmu_stats();
 301
 302         register_cpu_notifier(&sysfs_cpu_nb);
 303
 304         for_each_possible_cpu(cpu) {
 305                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 306
 307                 register_cpu(c, cpu);
 308                 if (cpu_online(cpu))
 309                         register_cpu_online(cpu);
 310         }
 311
 312         return 0;
 313 }
 314
 315 subsys_initcall(topology_init);