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