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