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 <asm/current.h>
   9 #include <asm/processor.h>
  10 #include <asm/cputable.h>
  11 #include <asm/hvcall.h>
  12 #include <asm/prom.h>
  13
  14
  15 /* SMT stuff */
  16
  17 #ifndef CONFIG_PPC_ISERIES
  18
  19 /* default to snooze disabled */
  20 DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
  21
  22 static ssize_t store_smt_snooze_delay(struct sys_device *dev, const char *buf,
  23                                       size_t count)
  24 {
  25         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  26         ssize_t ret;
  27         unsigned long snooze;
  28
  29         ret = sscanf(buf, "%lu", &snooze);
  30         if (ret != 1)
  31                 return -EINVAL;
  32
  33         per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
  34
  35         return count;
  36 }
  37
  38 static ssize_t show_smt_snooze_delay(struct sys_device *dev, char *buf)
  39 {
  40         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
  41
  42         return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
  43 }
  44
  45 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
  46                    store_smt_snooze_delay);
  47
  48 /* Only parse OF options if the matching cmdline option was not specified */
  49 static int smt_snooze_cmdline;
  50
  51 static int __init smt_setup(void)
  52 {
  53         struct device_node *options;
  54         unsigned int *val;
  55         unsigned int cpu;
  56
  57         if (!cur_cpu_spec->cpu_features & CPU_FTR_SMT)
  58                 return 1;
  59
  60         options = find_path_device("/options");
  61         if (!options)
  62                 return 1;
  63
  64         val = (unsigned int *)get_property(options, "ibm,smt-snooze-delay",
  65                                            NULL);
  66         if (!smt_snooze_cmdline && val) {
  67                 for_each_cpu(cpu)
  68                         per_cpu(smt_snooze_delay, cpu) = *val;
  69         }
  70
  71         return 1;
  72 }
  73 __initcall(smt_setup);
  74
  75 static int __init setup_smt_snooze_delay(char *str)
  76 {
  77         unsigned int cpu;
  78         int snooze;
  79
  80         if (!cur_cpu_spec->cpu_features & CPU_FTR_SMT)
  81                 return 1;
  82
  83         smt_snooze_cmdline = 1;
  84
  85         if (get_option(&str, &snooze)) {
  86                 for_each_cpu(cpu)
  87                         per_cpu(smt_snooze_delay, cpu) = snooze;
  88         }
  89
  90         return 1;
  91 }
  92 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
  93
  94 #endif
  95
  96
  97 /* PMC stuff */
  98
  99 /*
 100  * Enabling PMCs will slow partition context switch times so we only do
 101  * it the first time we write to the PMCs.
 102  */
 103
 104 static DEFINE_PER_CPU(char, pmcs_enabled);
 105
 106 #ifdef CONFIG_PPC_ISERIES
 107 void ppc64_enable_pmcs(void)
 108 {
 109         /* XXX Implement for iseries */
 110 }
 111 #else
 112 void ppc64_enable_pmcs(void)
 113 {
 114         unsigned long hid0;
 115         unsigned long set, reset;
 116         int ret;
 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                         hid0 = mfspr(HID0);
 127                         hid0 |= 1UL << (63 - 20);
 128
 129                         /* POWER4 requires the following sequence */
 130                         asm volatile(
 131                                 "sync\n"
 132                                 "mtspr  %1, %0\n"
 133                                 "mfspr  %0, %1\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                                 "isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
 140                                 "memory");
 141                         break;
 142
 143                 case PLATFORM_PSERIES_LPAR:
 144                         set = 1UL << 63;
 145                         reset = 0;
 146                         ret = plpar_hcall_norets(H_PERFMON, set, reset);
 147                         if (ret)
 148                                 printk(KERN_ERR "H_PERFMON call returned %d",
 149                                        ret);
 150                         break;
 151
 152                 default:
 153                         break;
 154         }
 155
 156         /* instruct hypervisor to maintain PMCs */
 157         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
 158                 char *ptr = (char *)&paca[smp_processor_id()].xLpPaca;
 159                 ptr[0xBB] = 1;
 160         }
 161 }
 162 #endif
 163
 164 /* XXX convert to rusty's on_one_cpu */
 165 static unsigned long run_on_cpu(unsigned long cpu,
 166                                 unsigned long (*func)(unsigned long),
 167                                 unsigned long arg)
 168 {
 169         cpumask_t old_affinity = current->cpus_allowed;
 170         unsigned long ret;
 171
 172         /* should return -EINVAL to userspace */
 173         if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
 174                 return 0;
 175
 176         ret = func(arg);
 177
 178         set_cpus_allowed(current, old_affinity);
 179
 180         return ret;
 181 }
 182
 183 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
 184 static unsigned long read_##NAME(unsigned long junk) \
 185 { \
 186         return mfspr(ADDRESS); \
 187 } \
 188 static unsigned long write_##NAME(unsigned long val) \
 189 { \
 190         ppc64_enable_pmcs(); \
 191         mtspr(ADDRESS, val); \
 192         return 0; \
 193 } \
 194 static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
 195 { \
 196         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 197         unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
 198         return sprintf(buf, "%lx\n", val); \
 199 } \
 200 static ssize_t store_##NAME(struct sys_device *dev, const char *buf, \
 201                             size_t count) \
 202 { \
 203         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
 204         unsigned long val; \
 205         int ret = sscanf(buf, "%lx", &val); \
 206         if (ret != 1) \
 207                 return -EINVAL; \
 208         run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
 209         return count; \
 210 }
 211
 212 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
 213 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
 214 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
 215 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
 216 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
 217 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
 218 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
 219 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
 220 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
 221 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
 222 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
 223 SYSFS_PMCSETUP(purr, SPRN_PURR);
 224
 225 static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
 226 static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
 227 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 228 static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
 229 static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
 230 static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
 231 static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
 232 static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
 233 static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
 234 static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
 235 static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
 236 static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
 237
 238 static void __init register_cpu_pmc(struct sys_device *s)
 239 {
 240         sysdev_create_file(s, &attr_mmcr0);
 241         sysdev_create_file(s, &attr_mmcr1);
 242
 243         if (cur_cpu_spec->cpu_features & CPU_FTR_MMCRA)
 244                 sysdev_create_file(s, &attr_mmcra);
 245
 246         sysdev_create_file(s, &attr_pmc1);
 247         sysdev_create_file(s, &attr_pmc2);
 248         sysdev_create_file(s, &attr_pmc3);
 249         sysdev_create_file(s, &attr_pmc4);
 250         sysdev_create_file(s, &attr_pmc5);
 251         sysdev_create_file(s, &attr_pmc6);
 252
 253         if (cur_cpu_spec->cpu_features & CPU_FTR_PMC8) {
 254                 sysdev_create_file(s, &attr_pmc7);
 255                 sysdev_create_file(s, &attr_pmc8);
 256         }
 257
 258         if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
 259                 sysdev_create_file(s, &attr_purr);
 260 }
 261
 262
 263 /* NUMA stuff */
 264
 265 #ifdef CONFIG_NUMA
 266 static struct node node_devices[MAX_NUMNODES];
 267
 268 static void register_nodes(void)
 269 {
 270         int i;
 271
 272         for (i = 0; i < MAX_NUMNODES; i++) {
 273                 if (node_online(i)) {
 274                         int p_node = parent_node(i);
 275                         struct node *parent = NULL;
 276
 277                         if (p_node != i)
 278                                 parent = &node_devices[p_node];
 279
 280                         register_node(&node_devices[i], i, parent);
 281                 }
 282         }
 283 }
 284 #else
 285 static void register_nodes(void)
 286 {
 287         return;
 288 }
 289 #endif
 290
 291
 292 /* Only valid if CPU is online. */
 293 static ssize_t show_physical_id(struct sys_device *dev, char *buf)
 294 {
 295         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
 296
 297         return sprintf(buf, "%u\n", get_hard_smp_processor_id(cpu->sysdev.id));
 298 }
 299 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
 300
 301
 302 static DEFINE_PER_CPU(struct cpu, cpu_devices);
 303
 304 static int __init topology_init(void)
 305 {
 306         int cpu;
 307         struct node *parent = NULL;
 308
 309         register_nodes();
 310
 311         for_each_cpu(cpu) {
 312                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 313
 314 #ifdef CONFIG_NUMA
 315                 parent = &node_devices[cpu_to_node(cpu)];
 316 #endif
 317                 register_cpu(c, cpu, parent);
 318
 319                 register_cpu_pmc(&c->sysdev);
 320
 321                 sysdev_create_file(&c->sysdev, &attr_physical_id);
 322
 323 #ifndef CONFIG_PPC_ISERIES
 324                 if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
 325                         sysdev_create_file(&c->sysdev, &attr_smt_snooze_delay);
 326 #endif
 327         }
 328
 329         return 0;
 330 }
 331 __initcall(topology_init);