1 #include <linux/config.h>
2 #include <linux/sysdev.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>
13 #include <asm/current.h>
14 #include <asm/processor.h>
15 #include <asm/cputable.h>
16 #include <asm/hvcall.h>
18 #include <asm/systemcfg.h>
20 #include <asm/lppaca.h>
21 #include <asm/machdep.h>
23 static DEFINE_PER_CPU(struct cpu, cpu_devices);
27 #ifdef CONFIG_PPC_MULTIPLATFORM
28 /* default to snooze disabled */
29 DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
31 static ssize_t store_smt_snooze_delay(struct sys_device *dev, const char *buf,
34 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
38 ret = sscanf(buf, "%lu", &snooze);
42 per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
47 static ssize_t show_smt_snooze_delay(struct sys_device *dev, char *buf)
49 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
51 return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
54 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
55 store_smt_snooze_delay);
57 /* Only parse OF options if the matching cmdline option was not specified */
58 static int smt_snooze_cmdline;
60 static int __init smt_setup(void)
62 struct device_node *options;
66 if (!cpu_has_feature(CPU_FTR_SMT))
69 options = find_path_device("/options");
73 val = (unsigned int *)get_property(options, "ibm,smt-snooze-delay",
75 if (!smt_snooze_cmdline && val) {
77 per_cpu(smt_snooze_delay, cpu) = *val;
82 __initcall(smt_setup);
84 static int __init setup_smt_snooze_delay(char *str)
89 if (!cpu_has_feature(CPU_FTR_SMT))
92 smt_snooze_cmdline = 1;
94 if (get_option(&str, &snooze)) {
96 per_cpu(smt_snooze_delay, cpu) = snooze;
101 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
104 * Enabling PMCs will slow partition context switch times so we only do
105 * it the first time we write to the PMCs.
108 static DEFINE_PER_CPU(char, pmcs_enabled);
110 void ppc64_enable_pmcs(void)
113 #ifdef CONFIG_PPC_PSERIES
114 unsigned long set, reset;
117 #endif /* CONFIG_PPC_PSERIES */
119 /* Only need to enable them once */
120 if (__get_cpu_var(pmcs_enabled))
123 __get_cpu_var(pmcs_enabled) = 1;
125 switch (systemcfg->platform) {
126 case PLATFORM_PSERIES:
127 case PLATFORM_POWERMAC:
129 hid0 |= 1UL << (63 - 20);
131 /* POWER4 requires the following sequence */
141 "isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
145 #ifdef CONFIG_PPC_PSERIES
146 case PLATFORM_PSERIES_LPAR:
149 ret = plpar_hcall_norets(H_PERFMON, set, reset);
151 printk(KERN_ERR "H_PERFMON call on cpu %u "
153 smp_processor_id(), ret);
155 #endif /* CONFIG_PPC_PSERIES */
161 #ifdef CONFIG_PPC_PSERIES
162 /* instruct hypervisor to maintain PMCs */
163 if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
164 get_paca()->lppaca.pmcregs_in_use = 1;
167 * On SMT machines we have to set the run latch in the ctrl register
168 * in order to make PMC6 spin.
170 if (cpu_has_feature(CPU_FTR_SMT)) {
175 #endif /* CONFIG_PPC_PSERIES */
181 void ppc64_enable_pmcs(void)
183 /* XXX Implement for iseries */
185 #endif /* CONFIG_PPC_MULTIPLATFORM */
187 EXPORT_SYMBOL(ppc64_enable_pmcs);
189 /* XXX convert to rusty's on_one_cpu */
190 static unsigned long run_on_cpu(unsigned long cpu,
191 unsigned long (*func)(unsigned long),
194 cpumask_t old_affinity = current->cpus_allowed;
197 /* should return -EINVAL to userspace */
198 if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
203 set_cpus_allowed(current, old_affinity);
208 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
209 static unsigned long read_##NAME(unsigned long junk) \
211 return mfspr(ADDRESS); \
213 static unsigned long write_##NAME(unsigned long val) \
215 ppc64_enable_pmcs(); \
216 mtspr(ADDRESS, val); \
219 static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
221 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
222 unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
223 return sprintf(buf, "%lx\n", val); \
225 static ssize_t __attribute_used__ \
226 store_##NAME(struct sys_device *dev, const char *buf, size_t count) \
228 struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
230 int ret = sscanf(buf, "%lx", &val); \
233 run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
237 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
238 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
239 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
240 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
241 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
242 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
243 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
244 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
245 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
246 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
247 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
248 SYSFS_PMCSETUP(purr, SPRN_PURR);
250 static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
251 static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
252 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
253 static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
254 static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
255 static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
256 static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
257 static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
258 static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
259 static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
260 static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
261 static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
263 static void register_cpu_online(unsigned int cpu)
265 struct cpu *c = &per_cpu(cpu_devices, cpu);
266 struct sys_device *s = &c->sysdev;
268 #ifndef CONFIG_PPC_ISERIES
269 if (cpu_has_feature(CPU_FTR_SMT))
270 sysdev_create_file(s, &attr_smt_snooze_delay);
275 sysdev_create_file(s, &attr_mmcr0);
276 sysdev_create_file(s, &attr_mmcr1);
278 if (cpu_has_feature(CPU_FTR_MMCRA))
279 sysdev_create_file(s, &attr_mmcra);
281 sysdev_create_file(s, &attr_pmc1);
282 sysdev_create_file(s, &attr_pmc2);
283 sysdev_create_file(s, &attr_pmc3);
284 sysdev_create_file(s, &attr_pmc4);
285 sysdev_create_file(s, &attr_pmc5);
286 sysdev_create_file(s, &attr_pmc6);
288 if (cpu_has_feature(CPU_FTR_PMC8)) {
289 sysdev_create_file(s, &attr_pmc7);
290 sysdev_create_file(s, &attr_pmc8);
293 if (cpu_has_feature(CPU_FTR_SMT))
294 sysdev_create_file(s, &attr_purr);
297 #ifdef CONFIG_HOTPLUG_CPU
298 static void unregister_cpu_online(unsigned int cpu)
300 struct cpu *c = &per_cpu(cpu_devices, cpu);
301 struct sys_device *s = &c->sysdev;
303 BUG_ON(c->no_control);
305 #ifndef CONFIG_PPC_ISERIES
306 if (cpu_has_feature(CPU_FTR_SMT))
307 sysdev_remove_file(s, &attr_smt_snooze_delay);
312 sysdev_remove_file(s, &attr_mmcr0);
313 sysdev_remove_file(s, &attr_mmcr1);
315 if (cpu_has_feature(CPU_FTR_MMCRA))
316 sysdev_remove_file(s, &attr_mmcra);
318 sysdev_remove_file(s, &attr_pmc1);
319 sysdev_remove_file(s, &attr_pmc2);
320 sysdev_remove_file(s, &attr_pmc3);
321 sysdev_remove_file(s, &attr_pmc4);
322 sysdev_remove_file(s, &attr_pmc5);
323 sysdev_remove_file(s, &attr_pmc6);
325 if (cpu_has_feature(CPU_FTR_PMC8)) {
326 sysdev_remove_file(s, &attr_pmc7);
327 sysdev_remove_file(s, &attr_pmc8);
330 if (cpu_has_feature(CPU_FTR_SMT))
331 sysdev_remove_file(s, &attr_purr);
333 #endif /* CONFIG_HOTPLUG_CPU */
335 static int __devinit sysfs_cpu_notify(struct notifier_block *self,
336 unsigned long action, void *hcpu)
338 unsigned int cpu = (unsigned int)(long)hcpu;
342 register_cpu_online(cpu);
344 #ifdef CONFIG_HOTPLUG_CPU
346 unregister_cpu_online(cpu);
353 static struct notifier_block __devinitdata sysfs_cpu_nb = {
354 .notifier_call = sysfs_cpu_notify,
360 static struct node node_devices[MAX_NUMNODES];
362 static void register_nodes(void)
366 for (i = 0; i < MAX_NUMNODES; i++) {
367 if (node_online(i)) {
368 int p_node = parent_node(i);
369 struct node *parent = NULL;
372 parent = &node_devices[p_node];
374 register_node(&node_devices[i], i, parent);
379 static void register_nodes(void)
385 /* Only valid if CPU is present. */
386 static ssize_t show_physical_id(struct sys_device *dev, char *buf)
388 struct cpu *cpu = container_of(dev, struct cpu, sysdev);
390 return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
392 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
394 static int __init topology_init(void)
397 struct node *parent = NULL;
401 register_cpu_notifier(&sysfs_cpu_nb);
404 struct cpu *c = &per_cpu(cpu_devices, cpu);
407 parent = &node_devices[cpu_to_node(cpu)];
410 * For now, we just see if the system supports making
411 * the RTAS calls for CPU hotplug. But, there may be a
412 * more comprehensive way to do this for an individual
413 * CPU. For instance, the boot cpu might never be valid
419 if (cpu_online(cpu) || (c->no_control == 0)) {
420 register_cpu(c, cpu, parent);
422 sysdev_create_file(&c->sysdev, &attr_physical_id);
426 register_cpu_online(cpu);
431 __initcall(topology_init);