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