arch/ppc64/kernel/sysfs.c

   1 #include <linux/config.h>
   2 #include <linux/sysdev.h>
   3 #include <linux/cpu.h>
   4 #include <linux/smp.h>
   5 #include <linux/percpu.h>
   6 #include <linux/init.h>
   7 #include <linux/sched.h>
   8 #include <linux/module.h>
   9 #include <linux/nodemask.h>
  10 #include <linux/cpumask.h>
  11 #include <linux/notifier.h>
  12
  13 #include <asm/current.h>
  14 #include <asm/processor.h>
  15 #include <asm/cputable.h>
  16 #include <asm/firmware.h>
  17 #include <asm/hvcall.h>
  18 #include <asm/prom.h>
  19 #include <asm/systemcfg.h>
  20 #include <asm/paca.h>
  21 #include <asm/lppaca.h>
  22 #include <asm/machdep.h>
  23
  24 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  25
  26 /* SMT stuff */
  27
  28 #ifdef CONFIG_PPC_MULTIPLATFORM
  29 /* default to snooze disabled */
  30 DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
  31
  32 static ssize_t store_smt_snooze_delay(struct sys_device *dev, const char *buf,
  33                                       size_t count)
  34 {
  35         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  36         ssize_t ret;
  37         unsigned long snooze;
  38
  39         ret = sscanf(buf, "%lu", &snooze);
  40         if (ret != 1)
  41                 return -EINVAL;
  42
  43         per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
  44
  45         return count;
  46 }
  47
  48 static ssize_t show_smt_snooze_delay(struct sys_device *dev, char *buf)
  49 {
  50         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  51
  52         return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
  53 }
  54
  55 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
  56                    store_smt_snooze_delay);
  57
  58 /* Only parse OF options if the matching cmdline option was not specified */
  59 static int smt_snooze_cmdline;
  60
  61 static int __init smt_setup(void)
  62 {
  63         struct device_node *options;
  64         unsigned int *val;
  65         unsigned int cpu;
  66
  67         if (!cpu_has_feature(CPU_FTR_SMT))
  68                 return 1;
  69
  70         options = find_path_device("/options");
  71         if (!options)
  72                 return 1;
  73
  74         val = (unsigned int *)get_property(options, "ibm,smt-snooze-delay",
  75                                            NULL);
  76         if (!smt_snooze_cmdline && val) {
  77                 for_each_cpu(cpu)
  78                         per_cpu(smt_snooze_delay, cpu) = *val;
  79         }
  80
  81         return 1;
  82 }
  83 __initcall(smt_setup);
  84
  85 static int __init setup_smt_snooze_delay(char *str)
  86 {
  87         unsigned int cpu;
  88         int snooze;
  89
  90         if (!cpu_has_feature(CPU_FTR_SMT))
  91                 return 1;
  92
  93         smt_snooze_cmdline = 1;
  94
  95         if (get_option(&str, &snooze)) {
  96                 for_each_cpu(cpu)
  97                         per_cpu(smt_snooze_delay, cpu) = snooze;
  98         }
  99
 100         return 1;
 101 }
 102 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
 103
 104 /*
 105  * Enabling PMCs will slow partition context switch times so we only do
 106  * it the first time we write to the PMCs.
 107  */
 108
 109 static DEFINE_PER_CPU(char, pmcs_enabled);
 110
 111 void ppc64_enable_pmcs(void)
 112 {
 113         unsigned long hid0;
 114 #ifdef CONFIG_PPC_PSERIES
 115         unsigned long set, reset;
 116 #endif /* CONFIG_PPC_PSERIES */
 117
 118         /* Only need to enable them once */
 119         if (__get_cpu_var(pmcs_enabled))
 120                 return;
 121
 122         __get_cpu_var(pmcs_enabled) = 1;
 123
 124         switch (systemcfg->platform) {
 125         case PLATFORM_PSERIES:
 126         case PLATFORM_POWERMAC:
 127                 hid0 = mfspr(HID0);
 128                 hid0 |= 1UL << (63 - 20);
 129
 130                 /* POWER4 requires the following sequence */
 131                 asm volatile(
 132                              "sync\n"
 133                              "mtspr     %1, %0\n"
 134                              "mfspr     %0, %1\n"
 135                              "mfspr     %0, %1\n"
 136                              "mfspr     %0, %1\n"
 137                              "mfspr     %0, %1\n"
 138                              "mfspr     %0, %1\n"
 139                              "mfspr     %0, %1\n"
 140                              "isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
 141                              "memory");
 142                 break;
 143
 144 #ifdef CONFIG_PPC_PSERIES
 145         case PLATFORM_PSERIES_LPAR:
 146                 set = 1UL << 63;
 147                 reset = 0;
 148                 plpar_hcall_norets(H_PERFMON, set, reset);
 149                 break;
 150 #endif /* CONFIG_PPC_PSERIES */
 151
 152         default:
 153                 break;
 154         }
 155
 156         /* instruct hypervisor to maintain PMCs */
 157         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 158                 get_paca()->lppaca.pmcregs_in_use = 1;
 159 }
 160
 161 #else
 162
 163 /* PMC stuff */
 164 void ppc64_enable_pmcs(void)
 165 {
 166         /* XXX Implement for iseries */
 167 }
 168 #endif /* CONFIG_PPC_MULTIPLATFORM */
 169
 170 EXPORT_SYMBOL(ppc64_enable_pmcs);
 171
 172 /* XXX convert to rusty's on_one_cpu */
 173 static unsigned long run_on_cpu(unsigned long cpu,
 174                                 unsigned long (*func)(unsigned long),
 175                                 unsigned long arg)
 176 {
 177         cpumask_t old_affinity = current->cpus_allowed;
 178         unsigned long ret;
 179
 180         /* should return -EINVAL to userspace */
 181         if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
 182                 return 0;
 183
 184         ret = func(arg);
 185
 186         set_cpus_allowed(current, old_affinity);
 187
 188         return ret;
 189 }
 190
 191 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
 192 static unsigned long read_##NAME(unsigned long junk) \
 193 { \
 194         return mfspr(ADDRESS); \
 195 } \
 196 static unsigned long write_##NAME(unsigned long val) \
 197 { \
 198         ppc64_enable_pmcs(); \
 199         mtspr(ADDRESS, val); \
 200         return 0; \
 201 } \
 202 static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
 203 { \
 204         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 205         unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
 206         return sprintf(buf, "%lx\n", val); \
 207 } \
 208 static ssize_t __attribute_used__ \
 209         store_##NAME(struct sys_device *dev, const char *buf, size_t count) \
 210 { \
 211         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 212         unsigned long val; \
 213         int ret = sscanf(buf, "%lx", &val); \
 214         if (ret != 1) \
 215                 return -EINVAL; \
 216         run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
 217         return count; \
 218 }
 219
 220 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
 221 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
 222 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
 223 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
 224 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
 225 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
 226 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
 227 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
 228 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
 229 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
 230 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
 231 SYSFS_PMCSETUP(purr, SPRN_PURR);
 232
 233 static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
 234 static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
 235 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 236 static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
 237 static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
 238 static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
 239 static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
 240 static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
 241 static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
 242 static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
 243 static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
 244 static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
 245
 246 static void register_cpu_online(unsigned int cpu)
 247 {
 248         struct cpu *c = &per_cpu(cpu_devices, cpu);
 249         struct sys_device *s = &c->sysdev;
 250
 251 #ifndef CONFIG_PPC_ISERIES
 252         if (cpu_has_feature(CPU_FTR_SMT))
 253                 sysdev_create_file(s, &attr_smt_snooze_delay);
 254 #endif
 255
 256         /* PMC stuff */
 257
 258         sysdev_create_file(s, &attr_mmcr0);
 259         sysdev_create_file(s, &attr_mmcr1);
 260
 261         if (cpu_has_feature(CPU_FTR_MMCRA))
 262                 sysdev_create_file(s, &attr_mmcra);
 263
 264         sysdev_create_file(s, &attr_pmc1);
 265         sysdev_create_file(s, &attr_pmc2);
 266         sysdev_create_file(s, &attr_pmc3);
 267         sysdev_create_file(s, &attr_pmc4);
 268         sysdev_create_file(s, &attr_pmc5);
 269         sysdev_create_file(s, &attr_pmc6);
 270
 271         if (cpu_has_feature(CPU_FTR_PMC8)) {
 272                 sysdev_create_file(s, &attr_pmc7);
 273                 sysdev_create_file(s, &attr_pmc8);
 274         }
 275
 276         if (cpu_has_feature(CPU_FTR_SMT))
 277                 sysdev_create_file(s, &attr_purr);
 278 }
 279
 280 #ifdef CONFIG_HOTPLUG_CPU
 281 static void unregister_cpu_online(unsigned int cpu)
 282 {
 283         struct cpu *c = &per_cpu(cpu_devices, cpu);
 284         struct sys_device *s = &c->sysdev;
 285
 286         BUG_ON(c->no_control);
 287
 288 #ifndef CONFIG_PPC_ISERIES
 289         if (cpu_has_feature(CPU_FTR_SMT))
 290                 sysdev_remove_file(s, &attr_smt_snooze_delay);
 291 #endif
 292
 293         /* PMC stuff */
 294
 295         sysdev_remove_file(s, &attr_mmcr0);
 296         sysdev_remove_file(s, &attr_mmcr1);
 297
 298         if (cpu_has_feature(CPU_FTR_MMCRA))
 299                 sysdev_remove_file(s, &attr_mmcra);
 300
 301         sysdev_remove_file(s, &attr_pmc1);
 302         sysdev_remove_file(s, &attr_pmc2);
 303         sysdev_remove_file(s, &attr_pmc3);
 304         sysdev_remove_file(s, &attr_pmc4);
 305         sysdev_remove_file(s, &attr_pmc5);
 306         sysdev_remove_file(s, &attr_pmc6);
 307
 308         if (cpu_has_feature(CPU_FTR_PMC8)) {
 309                 sysdev_remove_file(s, &attr_pmc7);
 310                 sysdev_remove_file(s, &attr_pmc8);
 311         }
 312
 313         if (cpu_has_feature(CPU_FTR_SMT))
 314                 sysdev_remove_file(s, &attr_purr);
 315 }
 316 #endif /* CONFIG_HOTPLUG_CPU */
 317
 318 static int __devinit sysfs_cpu_notify(struct notifier_block *self,
 319                                       unsigned long action, void *hcpu)
 320 {
 321         unsigned int cpu = (unsigned int)(long)hcpu;
 322
 323         switch (action) {
 324         case CPU_ONLINE:
 325                 register_cpu_online(cpu);
 326                 break;
 327 #ifdef CONFIG_HOTPLUG_CPU
 328         case CPU_DEAD:
 329                 unregister_cpu_online(cpu);
 330                 break;
 331 #endif
 332         }
 333         return NOTIFY_OK;
 334 }
 335
 336 static struct notifier_block __devinitdata sysfs_cpu_nb = {
 337         .notifier_call  = sysfs_cpu_notify,
 338 };
 339
 340 /* NUMA stuff */
 341
 342 #ifdef CONFIG_NUMA
 343 static struct node node_devices[MAX_NUMNODES];
 344
 345 static void register_nodes(void)
 346 {
 347         int i;
 348
 349         for (i = 0; i < MAX_NUMNODES; i++) {
 350                 if (node_online(i)) {
 351                         int p_node = parent_node(i);
 352                         struct node *parent = NULL;
 353
 354                         if (p_node != i)
 355                                 parent = &node_devices[p_node];
 356
 357                         register_node(&node_devices[i], i, parent);
 358                 }
 359         }
 360 }
 361 #else
 362 static void register_nodes(void)
 363 {
 364         return;
 365 }
 366 #endif
 367
 368 /* Only valid if CPU is present. */
 369 static ssize_t show_physical_id(struct sys_device *dev, char *buf)
 370 {
 371         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
 372
 373         return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
 374 }
 375 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
 376
 377 static int __init topology_init(void)
 378 {
 379         int cpu;
 380         struct node *parent = NULL;
 381
 382         register_nodes();
 383
 384         register_cpu_notifier(&sysfs_cpu_nb);
 385
 386         for_each_cpu(cpu) {
 387                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 388
 389 #ifdef CONFIG_NUMA
 390                 /* The node to which a cpu belongs can't be known
 391                  * until the cpu is made present.
 392                  */
 393                 parent = NULL;
 394                 if (cpu_present(cpu))
 395                         parent = &node_devices[cpu_to_node(cpu)];
 396 #endif
 397                 /*
 398                  * For now, we just see if the system supports making
 399                  * the RTAS calls for CPU hotplug.  But, there may be a
 400                  * more comprehensive way to do this for an individual
 401                  * CPU.  For instance, the boot cpu might never be valid
 402                  * for hotplugging.
 403                  */
 404                 if (!ppc_md.cpu_die)
 405                         c->no_control = 1;
 406
 407                 if (cpu_online(cpu) || (c->no_control == 0)) {
 408                         register_cpu(c, cpu, parent);
 409
 410                         sysdev_create_file(&c->sysdev, &attr_physical_id);
 411                 }
 412
 413                 if (cpu_online(cpu))
 414                         register_cpu_online(cpu);
 415         }
 416
 417         return 0;
 418 }
 419 __initcall(topology_init);