arch/sparc/kernel/sysfs.c

   1 /* sysfs.c: Topology 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/device.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 device *dev, \
  20                         struct device_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 DEVICE_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         &dev_attr_immu_tsb_hits_ctx0_8k_tte.attr,
  62         &dev_attr_immu_tsb_ticks_ctx0_8k_tte.attr,
  63         &dev_attr_immu_tsb_hits_ctx0_64k_tte.attr,
  64         &dev_attr_immu_tsb_ticks_ctx0_64k_tte.attr,
  65         &dev_attr_immu_tsb_hits_ctx0_4mb_tte.attr,
  66         &dev_attr_immu_tsb_ticks_ctx0_4mb_tte.attr,
  67         &dev_attr_immu_tsb_hits_ctx0_256mb_tte.attr,
  68         &dev_attr_immu_tsb_ticks_ctx0_256mb_tte.attr,
  69         &dev_attr_immu_tsb_hits_ctxnon0_8k_tte.attr,
  70         &dev_attr_immu_tsb_ticks_ctxnon0_8k_tte.attr,
  71         &dev_attr_immu_tsb_hits_ctxnon0_64k_tte.attr,
  72         &dev_attr_immu_tsb_ticks_ctxnon0_64k_tte.attr,
  73         &dev_attr_immu_tsb_hits_ctxnon0_4mb_tte.attr,
  74         &dev_attr_immu_tsb_ticks_ctxnon0_4mb_tte.attr,
  75         &dev_attr_immu_tsb_hits_ctxnon0_256mb_tte.attr,
  76         &dev_attr_immu_tsb_ticks_ctxnon0_256mb_tte.attr,
  77         &dev_attr_dmmu_tsb_hits_ctx0_8k_tte.attr,
  78         &dev_attr_dmmu_tsb_ticks_ctx0_8k_tte.attr,
  79         &dev_attr_dmmu_tsb_hits_ctx0_64k_tte.attr,
  80         &dev_attr_dmmu_tsb_ticks_ctx0_64k_tte.attr,
  81         &dev_attr_dmmu_tsb_hits_ctx0_4mb_tte.attr,
  82         &dev_attr_dmmu_tsb_ticks_ctx0_4mb_tte.attr,
  83         &dev_attr_dmmu_tsb_hits_ctx0_256mb_tte.attr,
  84         &dev_attr_dmmu_tsb_ticks_ctx0_256mb_tte.attr,
  85         &dev_attr_dmmu_tsb_hits_ctxnon0_8k_tte.attr,
  86         &dev_attr_dmmu_tsb_ticks_ctxnon0_8k_tte.attr,
  87         &dev_attr_dmmu_tsb_hits_ctxnon0_64k_tte.attr,
  88         &dev_attr_dmmu_tsb_ticks_ctxnon0_64k_tte.attr,
  89         &dev_attr_dmmu_tsb_hits_ctxnon0_4mb_tte.attr,
  90         &dev_attr_dmmu_tsb_ticks_ctxnon0_4mb_tte.attr,
  91         &dev_attr_dmmu_tsb_hits_ctxnon0_256mb_tte.attr,
  92         &dev_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;
 107         unsigned long ret;
 108
 109         cpumask_copy(&old_affinity, tsk_cpus_allowed(current));
 110         /* should return -EINVAL to userspace */
 111         if (set_cpus_allowed_ptr(current, cpumask_of(cpu)))
 112                 return 0;
 113
 114         ret = func(arg);
 115
 116         set_cpus_allowed_ptr(current, &old_affinity);
 117
 118         return ret;
 119 }
 120
 121 static unsigned long read_mmustat_enable(unsigned long junk)
 122 {
 123         unsigned long ra = 0;
 124
 125         sun4v_mmustat_info(&ra);
 126
 127         return ra != 0;
 128 }
 129
 130 static unsigned long write_mmustat_enable(unsigned long val)
 131 {
 132         unsigned long ra, orig_ra;
 133
 134         if (val)
 135                 ra = __pa(&per_cpu(mmu_stats, smp_processor_id()));
 136         else
 137                 ra = 0UL;
 138
 139         return sun4v_mmustat_conf(ra, &orig_ra);
 140 }
 141
 142 static ssize_t show_mmustat_enable(struct device *s,
 143                                 struct device_attribute *attr, char *buf)
 144 {
 145         unsigned long val = run_on_cpu(s->id, read_mmustat_enable, 0);
 146         return sprintf(buf, "%lx\n", val);
 147 }
 148
 149 static ssize_t store_mmustat_enable(struct device *s,
 150                         struct device_attribute *attr, const char *buf,
 151                         size_t count)
 152 {
 153         unsigned long val, err;
 154         int ret = sscanf(buf, "%lu", &val);
 155
 156         if (ret != 1)
 157                 return -EINVAL;
 158
 159         err = run_on_cpu(s->id, write_mmustat_enable, val);
 160         if (err)
 161                 return -EIO;
 162
 163         return count;
 164 }
 165
 166 static DEVICE_ATTR(mmustat_enable, 0644, show_mmustat_enable, store_mmustat_enable);
 167
 168 static int mmu_stats_supported;
 169
 170 static int register_mmu_stats(struct device *s)
 171 {
 172         if (!mmu_stats_supported)
 173                 return 0;
 174         device_create_file(s, &dev_attr_mmustat_enable);
 175         return sysfs_create_group(&s->kobj, &mmu_stat_group);
 176 }
 177
 178 #ifdef CONFIG_HOTPLUG_CPU
 179 static void unregister_mmu_stats(struct device *s)
 180 {
 181         if (!mmu_stats_supported)
 182                 return;
 183         sysfs_remove_group(&s->kobj, &mmu_stat_group);
 184         device_remove_file(s, &dev_attr_mmustat_enable);
 185 }
 186 #endif
 187
 188 #define SHOW_CPUDATA_ULONG_NAME(NAME, MEMBER) \
 189 static ssize_t show_##NAME(struct device *dev, \
 190                 struct device_attribute *attr, char *buf) \
 191 { \
 192         cpuinfo_sparc *c = &cpu_data(dev->id); \
 193         return sprintf(buf, "%lu\n", c->MEMBER); \
 194 }
 195
 196 #define SHOW_CPUDATA_UINT_NAME(NAME, MEMBER) \
 197 static ssize_t show_##NAME(struct device *dev, \
 198                 struct device_attribute *attr, char *buf) \
 199 { \
 200         cpuinfo_sparc *c = &cpu_data(dev->id); \
 201         return sprintf(buf, "%u\n", c->MEMBER); \
 202 }
 203
 204 SHOW_CPUDATA_ULONG_NAME(clock_tick, clock_tick);
 205 SHOW_CPUDATA_UINT_NAME(l1_dcache_size, dcache_size);
 206 SHOW_CPUDATA_UINT_NAME(l1_dcache_line_size, dcache_line_size);
 207 SHOW_CPUDATA_UINT_NAME(l1_icache_size, icache_size);
 208 SHOW_CPUDATA_UINT_NAME(l1_icache_line_size, icache_line_size);
 209 SHOW_CPUDATA_UINT_NAME(l2_cache_size, ecache_size);
 210 SHOW_CPUDATA_UINT_NAME(l2_cache_line_size, ecache_line_size);
 211
 212 static struct device_attribute cpu_core_attrs[] = {
 213         __ATTR(clock_tick,          0444, show_clock_tick, NULL),
 214         __ATTR(l1_dcache_size,      0444, show_l1_dcache_size, NULL),
 215         __ATTR(l1_dcache_line_size, 0444, show_l1_dcache_line_size, NULL),
 216         __ATTR(l1_icache_size,      0444, show_l1_icache_size, NULL),
 217         __ATTR(l1_icache_line_size, 0444, show_l1_icache_line_size, NULL),
 218         __ATTR(l2_cache_size,       0444, show_l2_cache_size, NULL),
 219         __ATTR(l2_cache_line_size,  0444, show_l2_cache_line_size, NULL),
 220 };
 221
 222 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 223
 224 static int register_cpu_online(unsigned int cpu)
 225 {
 226         struct cpu *c = &per_cpu(cpu_devices, cpu);
 227         struct device *s = &c->dev;
 228         int i;
 229
 230         for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
 231                 device_create_file(s, &cpu_core_attrs[i]);
 232
 233         register_mmu_stats(s);
 234         return 0;
 235 }
 236
 237 static int unregister_cpu_online(unsigned int cpu)
 238 {
 239 #ifdef CONFIG_HOTPLUG_CPU
 240         struct cpu *c = &per_cpu(cpu_devices, cpu);
 241         struct device *s = &c->dev;
 242         int i;
 243
 244         unregister_mmu_stats(s);
 245         for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
 246                 device_remove_file(s, &cpu_core_attrs[i]);
 247 #endif
 248         return 0;
 249 }
 250
 251 static void __init check_mmu_stats(void)
 252 {
 253         unsigned long dummy1, err;
 254
 255         if (tlb_type != hypervisor)
 256                 return;
 257
 258         err = sun4v_mmustat_info(&dummy1);
 259         if (!err)
 260                 mmu_stats_supported = 1;
 261 }
 262
 263 static void register_nodes(void)
 264 {
 265 #ifdef CONFIG_NUMA
 266         int i;
 267
 268         for (i = 0; i < MAX_NUMNODES; i++)
 269                 register_one_node(i);
 270 #endif
 271 }
 272
 273 static int __init topology_init(void)
 274 {
 275         int cpu, ret;
 276
 277         register_nodes();
 278
 279         check_mmu_stats();
 280
 281         for_each_possible_cpu(cpu) {
 282                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 283
 284                 register_cpu(c, cpu);
 285         }
 286
 287         ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "sparc/topology:online",
 288                                 register_cpu_online, unregister_cpu_online);
 289         WARN_ON(ret < 0);
 290         return 0;
 291 }
 292
 293 subsys_initcall(topology_init);