arch/sparc/kernel/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* sysfs.c: Topology sysfs support code for sparc64.
   3  *
   4  * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
   5  */
   6 #include <linux/sched.h>
   7 #include <linux/device.h>
   8 #include <linux/cpu.h>
   9 #include <linux/smp.h>
  10 #include <linux/percpu.h>
  11 #include <linux/init.h>
  12
  13 #include <asm/cpudata.h>
  14 #include <asm/hypervisor.h>
  15 #include <asm/spitfire.h>
  16
  17 static DEFINE_PER_CPU(struct hv_mmu_statistics, mmu_stats) __attribute__((aligned(64)));
  18
  19 #define SHOW_MMUSTAT_ULONG(NAME) \
  20 static ssize_t show_##NAME(struct device *dev, \
  21                         struct device_attribute *attr, char *buf) \
  22 { \
  23         struct hv_mmu_statistics *p = &per_cpu(mmu_stats, dev->id); \
  24         return sprintf(buf, "%lu\n", p->NAME); \
  25 } \
  26 static DEVICE_ATTR(NAME, 0444, show_##NAME, NULL)
  27
  28 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_8k_tte);
  29 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_8k_tte);
  30 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_64k_tte);
  31 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_64k_tte);
  32 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_4mb_tte);
  33 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_4mb_tte);
  34 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctx0_256mb_tte);
  35 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctx0_256mb_tte);
  36 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_8k_tte);
  37 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_8k_tte);
  38 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_64k_tte);
  39 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_64k_tte);
  40 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_4mb_tte);
  41 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_4mb_tte);
  42 SHOW_MMUSTAT_ULONG(immu_tsb_hits_ctxnon0_256mb_tte);
  43 SHOW_MMUSTAT_ULONG(immu_tsb_ticks_ctxnon0_256mb_tte);
  44 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_8k_tte);
  45 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_8k_tte);
  46 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_64k_tte);
  47 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_64k_tte);
  48 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_4mb_tte);
  49 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_4mb_tte);
  50 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctx0_256mb_tte);
  51 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctx0_256mb_tte);
  52 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_8k_tte);
  53 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_8k_tte);
  54 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_64k_tte);
  55 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_64k_tte);
  56 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_4mb_tte);
  57 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_4mb_tte);
  58 SHOW_MMUSTAT_ULONG(dmmu_tsb_hits_ctxnon0_256mb_tte);
  59 SHOW_MMUSTAT_ULONG(dmmu_tsb_ticks_ctxnon0_256mb_tte);
  60
  61 static struct attribute *mmu_stat_attrs[] = {
  62         &dev_attr_immu_tsb_hits_ctx0_8k_tte.attr,
  63         &dev_attr_immu_tsb_ticks_ctx0_8k_tte.attr,
  64         &dev_attr_immu_tsb_hits_ctx0_64k_tte.attr,
  65         &dev_attr_immu_tsb_ticks_ctx0_64k_tte.attr,
  66         &dev_attr_immu_tsb_hits_ctx0_4mb_tte.attr,
  67         &dev_attr_immu_tsb_ticks_ctx0_4mb_tte.attr,
  68         &dev_attr_immu_tsb_hits_ctx0_256mb_tte.attr,
  69         &dev_attr_immu_tsb_ticks_ctx0_256mb_tte.attr,
  70         &dev_attr_immu_tsb_hits_ctxnon0_8k_tte.attr,
  71         &dev_attr_immu_tsb_ticks_ctxnon0_8k_tte.attr,
  72         &dev_attr_immu_tsb_hits_ctxnon0_64k_tte.attr,
  73         &dev_attr_immu_tsb_ticks_ctxnon0_64k_tte.attr,
  74         &dev_attr_immu_tsb_hits_ctxnon0_4mb_tte.attr,
  75         &dev_attr_immu_tsb_ticks_ctxnon0_4mb_tte.attr,
  76         &dev_attr_immu_tsb_hits_ctxnon0_256mb_tte.attr,
  77         &dev_attr_immu_tsb_ticks_ctxnon0_256mb_tte.attr,
  78         &dev_attr_dmmu_tsb_hits_ctx0_8k_tte.attr,
  79         &dev_attr_dmmu_tsb_ticks_ctx0_8k_tte.attr,
  80         &dev_attr_dmmu_tsb_hits_ctx0_64k_tte.attr,
  81         &dev_attr_dmmu_tsb_ticks_ctx0_64k_tte.attr,
  82         &dev_attr_dmmu_tsb_hits_ctx0_4mb_tte.attr,
  83         &dev_attr_dmmu_tsb_ticks_ctx0_4mb_tte.attr,
  84         &dev_attr_dmmu_tsb_hits_ctx0_256mb_tte.attr,
  85         &dev_attr_dmmu_tsb_ticks_ctx0_256mb_tte.attr,
  86         &dev_attr_dmmu_tsb_hits_ctxnon0_8k_tte.attr,
  87         &dev_attr_dmmu_tsb_ticks_ctxnon0_8k_tte.attr,
  88         &dev_attr_dmmu_tsb_hits_ctxnon0_64k_tte.attr,
  89         &dev_attr_dmmu_tsb_ticks_ctxnon0_64k_tte.attr,
  90         &dev_attr_dmmu_tsb_hits_ctxnon0_4mb_tte.attr,
  91         &dev_attr_dmmu_tsb_ticks_ctxnon0_4mb_tte.attr,
  92         &dev_attr_dmmu_tsb_hits_ctxnon0_256mb_tte.attr,
  93         &dev_attr_dmmu_tsb_ticks_ctxnon0_256mb_tte.attr,
  94         NULL,
  95 };
  96
  97 static struct attribute_group mmu_stat_group = {
  98         .attrs = mmu_stat_attrs,
  99         .name = "mmu_stats",
 100 };
 101
 102 static long read_mmustat_enable(void *data __maybe_unused)
 103 {
 104         unsigned long ra = 0;
 105
 106         sun4v_mmustat_info(&ra);
 107
 108         return ra != 0;
 109 }
 110
 111 static long write_mmustat_enable(void *data)
 112 {
 113         unsigned long ra, orig_ra, *val = data;
 114
 115         if (*val)
 116                 ra = __pa(&per_cpu(mmu_stats, smp_processor_id()));
 117         else
 118                 ra = 0UL;
 119
 120         return sun4v_mmustat_conf(ra, &orig_ra);
 121 }
 122
 123 static ssize_t show_mmustat_enable(struct device *s,
 124                                 struct device_attribute *attr, char *buf)
 125 {
 126         long val = work_on_cpu(s->id, read_mmustat_enable, NULL);
 127
 128         return sprintf(buf, "%lx\n", val);
 129 }
 130
 131 static ssize_t store_mmustat_enable(struct device *s,
 132                         struct device_attribute *attr, const char *buf,
 133                         size_t count)
 134 {
 135         unsigned long val;
 136         long err;
 137         int ret;
 138
 139         ret = sscanf(buf, "%lu", &val);
 140         if (ret != 1)
 141                 return -EINVAL;
 142
 143         err = work_on_cpu(s->id, write_mmustat_enable, &val);
 144         if (err)
 145                 return -EIO;
 146
 147         return count;
 148 }
 149
 150 static DEVICE_ATTR(mmustat_enable, 0644, show_mmustat_enable, store_mmustat_enable);
 151
 152 static int mmu_stats_supported;
 153
 154 static int register_mmu_stats(struct device *s)
 155 {
 156         if (!mmu_stats_supported)
 157                 return 0;
 158         device_create_file(s, &dev_attr_mmustat_enable);
 159         return sysfs_create_group(&s->kobj, &mmu_stat_group);
 160 }
 161
 162 #ifdef CONFIG_HOTPLUG_CPU
 163 static void unregister_mmu_stats(struct device *s)
 164 {
 165         if (!mmu_stats_supported)
 166                 return;
 167         sysfs_remove_group(&s->kobj, &mmu_stat_group);
 168         device_remove_file(s, &dev_attr_mmustat_enable);
 169 }
 170 #endif
 171
 172 #define SHOW_CPUDATA_ULONG_NAME(NAME, MEMBER) \
 173 static ssize_t show_##NAME(struct device *dev, \
 174                 struct device_attribute *attr, char *buf) \
 175 { \
 176         cpuinfo_sparc *c = &cpu_data(dev->id); \
 177         return sprintf(buf, "%lu\n", c->MEMBER); \
 178 }
 179
 180 #define SHOW_CPUDATA_UINT_NAME(NAME, MEMBER) \
 181 static ssize_t show_##NAME(struct device *dev, \
 182                 struct device_attribute *attr, char *buf) \
 183 { \
 184         cpuinfo_sparc *c = &cpu_data(dev->id); \
 185         return sprintf(buf, "%u\n", c->MEMBER); \
 186 }
 187
 188 SHOW_CPUDATA_ULONG_NAME(clock_tick, clock_tick);
 189 SHOW_CPUDATA_UINT_NAME(l1_dcache_size, dcache_size);
 190 SHOW_CPUDATA_UINT_NAME(l1_dcache_line_size, dcache_line_size);
 191 SHOW_CPUDATA_UINT_NAME(l1_icache_size, icache_size);
 192 SHOW_CPUDATA_UINT_NAME(l1_icache_line_size, icache_line_size);
 193 SHOW_CPUDATA_UINT_NAME(l2_cache_size, ecache_size);
 194 SHOW_CPUDATA_UINT_NAME(l2_cache_line_size, ecache_line_size);
 195
 196 static struct device_attribute cpu_core_attrs[] = {
 197         __ATTR(clock_tick,          0444, show_clock_tick, NULL),
 198         __ATTR(l1_dcache_size,      0444, show_l1_dcache_size, NULL),
 199         __ATTR(l1_dcache_line_size, 0444, show_l1_dcache_line_size, NULL),
 200         __ATTR(l1_icache_size,      0444, show_l1_icache_size, NULL),
 201         __ATTR(l1_icache_line_size, 0444, show_l1_icache_line_size, NULL),
 202         __ATTR(l2_cache_size,       0444, show_l2_cache_size, NULL),
 203         __ATTR(l2_cache_line_size,  0444, show_l2_cache_line_size, NULL),
 204 };
 205
 206 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 207
 208 static int register_cpu_online(unsigned int cpu)
 209 {
 210         struct cpu *c = &per_cpu(cpu_devices, cpu);
 211         struct device *s = &c->dev;
 212         int i;
 213
 214         for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
 215                 device_create_file(s, &cpu_core_attrs[i]);
 216
 217         register_mmu_stats(s);
 218         return 0;
 219 }
 220
 221 static int unregister_cpu_online(unsigned int cpu)
 222 {
 223 #ifdef CONFIG_HOTPLUG_CPU
 224         struct cpu *c = &per_cpu(cpu_devices, cpu);
 225         struct device *s = &c->dev;
 226         int i;
 227
 228         unregister_mmu_stats(s);
 229         for (i = 0; i < ARRAY_SIZE(cpu_core_attrs); i++)
 230                 device_remove_file(s, &cpu_core_attrs[i]);
 231 #endif
 232         return 0;
 233 }
 234
 235 static void __init check_mmu_stats(void)
 236 {
 237         unsigned long dummy1, err;
 238
 239         if (tlb_type != hypervisor)
 240                 return;
 241
 242         err = sun4v_mmustat_info(&dummy1);
 243         if (!err)
 244                 mmu_stats_supported = 1;
 245 }
 246
 247 static int __init topology_init(void)
 248 {
 249         int cpu, ret;
 250
 251         check_mmu_stats();
 252
 253         for_each_possible_cpu(cpu) {
 254                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 255
 256                 register_cpu(c, cpu);
 257         }
 258
 259         ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "sparc/topology:online",
 260                                 register_cpu_online, unregister_cpu_online);
 261         WARN_ON(ret < 0);
 262         return 0;
 263 }
 264
 265 subsys_initcall(topology_init);