Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / arch / powerpc / kernel / sysfs.c
1 #include <linux/sysdev.h>
2 #include <linux/cpu.h>
3 #include <linux/smp.h>
4 #include <linux/percpu.h>
5 #include <linux/init.h>
6 #include <linux/sched.h>
7 #include <linux/module.h>
8 #include <linux/nodemask.h>
9 #include <linux/cpumask.h>
10 #include <linux/notifier.h>
11
12 #include <asm/current.h>
13 #include <asm/processor.h>
14 #include <asm/cputable.h>
15 #include <asm/firmware.h>
16 #include <asm/hvcall.h>
17 #include <asm/prom.h>
18 #include <asm/paca.h>
19 #include <asm/lppaca.h>
20 #include <asm/machdep.h>
21 #include <asm/smp.h>
22
23 static DEFINE_PER_CPU(struct cpu, cpu_devices);
24
25 /* SMT stuff */
26
27 #ifdef CONFIG_PPC_MULTIPLATFORM
28 /* default to snooze disabled */
29 DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
30
31 static ssize_t store_smt_snooze_delay(struct sys_device *dev, const char *buf,
32                                       size_t count)
33 {
34         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
35         ssize_t ret;
36         unsigned long snooze;
37
38         ret = sscanf(buf, "%lu", &snooze);
39         if (ret != 1)
40                 return -EINVAL;
41
42         per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze;
43
44         return count;
45 }
46
47 static ssize_t show_smt_snooze_delay(struct sys_device *dev, char *buf)
48 {
49         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
50
51         return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
52 }
53
54 static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
55                    store_smt_snooze_delay);
56
57 /* Only parse OF options if the matching cmdline option was not specified */
58 static int smt_snooze_cmdline;
59
60 static int __init smt_setup(void)
61 {
62         struct device_node *options;
63         const unsigned int *val;
64         unsigned int cpu;
65
66         if (!cpu_has_feature(CPU_FTR_SMT))
67                 return -ENODEV;
68
69         options = find_path_device("/options");
70         if (!options)
71                 return -ENODEV;
72
73         val = get_property(options, "ibm,smt-snooze-delay", NULL);
74         if (!smt_snooze_cmdline && val) {
75                 for_each_possible_cpu(cpu)
76                         per_cpu(smt_snooze_delay, cpu) = *val;
77         }
78
79         return 0;
80 }
81 __initcall(smt_setup);
82
83 static int __init setup_smt_snooze_delay(char *str)
84 {
85         unsigned int cpu;
86         int snooze;
87
88         if (!cpu_has_feature(CPU_FTR_SMT))
89                 return 1;
90
91         smt_snooze_cmdline = 1;
92
93         if (get_option(&str, &snooze)) {
94                 for_each_possible_cpu(cpu)
95                         per_cpu(smt_snooze_delay, cpu) = snooze;
96         }
97
98         return 1;
99 }
100 __setup("smt-snooze-delay=", setup_smt_snooze_delay);
101
102 #endif /* CONFIG_PPC_MULTIPLATFORM */
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         /* Only need to enable them once */
114         if (__get_cpu_var(pmcs_enabled))
115                 return;
116
117         __get_cpu_var(pmcs_enabled) = 1;
118
119         if (ppc_md.enable_pmcs)
120                 ppc_md.enable_pmcs();
121 }
122 EXPORT_SYMBOL(ppc64_enable_pmcs);
123
124 /* XXX convert to rusty's on_one_cpu */
125 static unsigned long run_on_cpu(unsigned long cpu,
126                                 unsigned long (*func)(unsigned long),
127                                 unsigned long arg)
128 {
129         cpumask_t old_affinity = current->cpus_allowed;
130         unsigned long ret;
131
132         /* should return -EINVAL to userspace */
133         if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
134                 return 0;
135
136         ret = func(arg);
137
138         set_cpus_allowed(current, old_affinity);
139
140         return ret;
141 }
142
143 #define SYSFS_PMCSETUP(NAME, ADDRESS) \
144 static unsigned long read_##NAME(unsigned long junk) \
145 { \
146         return mfspr(ADDRESS); \
147 } \
148 static unsigned long write_##NAME(unsigned long val) \
149 { \
150         ppc64_enable_pmcs(); \
151         mtspr(ADDRESS, val); \
152         return 0; \
153 } \
154 static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
155 { \
156         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
157         unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
158         return sprintf(buf, "%lx\n", val); \
159 } \
160 static ssize_t __attribute_used__ \
161         store_##NAME(struct sys_device *dev, const char *buf, size_t count) \
162 { \
163         struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
164         unsigned long val; \
165         int ret = sscanf(buf, "%lx", &val); \
166         if (ret != 1) \
167                 return -EINVAL; \
168         run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
169         return count; \
170 }
171
172 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
173 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
174 SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
175 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
176 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
177 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
178 SYSFS_PMCSETUP(pmc4, SPRN_PMC4);
179 SYSFS_PMCSETUP(pmc5, SPRN_PMC5);
180 SYSFS_PMCSETUP(pmc6, SPRN_PMC6);
181 SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
182 SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
183 SYSFS_PMCSETUP(purr, SPRN_PURR);
184
185 static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
186 static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
187 static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
188 static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
189 static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
190 static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
191 static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
192 static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
193 static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
194 static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
195 static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
196 static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
197
198 static void register_cpu_online(unsigned int cpu)
199 {
200         struct cpu *c = &per_cpu(cpu_devices, cpu);
201         struct sys_device *s = &c->sysdev;
202
203 #ifndef CONFIG_PPC_ISERIES
204         if (cpu_has_feature(CPU_FTR_SMT))
205                 sysdev_create_file(s, &attr_smt_snooze_delay);
206 #endif
207
208         /* PMC stuff */
209
210         sysdev_create_file(s, &attr_mmcr0);
211         sysdev_create_file(s, &attr_mmcr1);
212
213         if (cpu_has_feature(CPU_FTR_MMCRA))
214                 sysdev_create_file(s, &attr_mmcra);
215
216         if (cur_cpu_spec->num_pmcs >= 1)
217                 sysdev_create_file(s, &attr_pmc1);
218         if (cur_cpu_spec->num_pmcs >= 2)
219                 sysdev_create_file(s, &attr_pmc2);
220         if (cur_cpu_spec->num_pmcs >= 3)
221                 sysdev_create_file(s, &attr_pmc3);
222         if (cur_cpu_spec->num_pmcs >= 4)
223                 sysdev_create_file(s, &attr_pmc4);
224         if (cur_cpu_spec->num_pmcs >= 5)
225                 sysdev_create_file(s, &attr_pmc5);
226         if (cur_cpu_spec->num_pmcs >= 6)
227                 sysdev_create_file(s, &attr_pmc6);
228         if (cur_cpu_spec->num_pmcs >= 7)
229                 sysdev_create_file(s, &attr_pmc7);
230         if (cur_cpu_spec->num_pmcs >= 8)
231                 sysdev_create_file(s, &attr_pmc8);
232
233         if (cpu_has_feature(CPU_FTR_PURR))
234                 sysdev_create_file(s, &attr_purr);
235 }
236
237 #ifdef CONFIG_HOTPLUG_CPU
238 static void unregister_cpu_online(unsigned int cpu)
239 {
240         struct cpu *c = &per_cpu(cpu_devices, cpu);
241         struct sys_device *s = &c->sysdev;
242
243         BUG_ON(c->no_control);
244
245 #ifndef CONFIG_PPC_ISERIES
246         if (cpu_has_feature(CPU_FTR_SMT))
247                 sysdev_remove_file(s, &attr_smt_snooze_delay);
248 #endif
249
250         /* PMC stuff */
251
252         sysdev_remove_file(s, &attr_mmcr0);
253         sysdev_remove_file(s, &attr_mmcr1);
254
255         if (cpu_has_feature(CPU_FTR_MMCRA))
256                 sysdev_remove_file(s, &attr_mmcra);
257
258         if (cur_cpu_spec->num_pmcs >= 1)
259                 sysdev_remove_file(s, &attr_pmc1);
260         if (cur_cpu_spec->num_pmcs >= 2)
261                 sysdev_remove_file(s, &attr_pmc2);
262         if (cur_cpu_spec->num_pmcs >= 3)
263                 sysdev_remove_file(s, &attr_pmc3);
264         if (cur_cpu_spec->num_pmcs >= 4)
265                 sysdev_remove_file(s, &attr_pmc4);
266         if (cur_cpu_spec->num_pmcs >= 5)
267                 sysdev_remove_file(s, &attr_pmc5);
268         if (cur_cpu_spec->num_pmcs >= 6)
269                 sysdev_remove_file(s, &attr_pmc6);
270         if (cur_cpu_spec->num_pmcs >= 7)
271                 sysdev_remove_file(s, &attr_pmc7);
272         if (cur_cpu_spec->num_pmcs >= 8)
273                 sysdev_remove_file(s, &attr_pmc8);
274
275         if (cpu_has_feature(CPU_FTR_PURR))
276                 sysdev_remove_file(s, &attr_purr);
277 }
278 #endif /* CONFIG_HOTPLUG_CPU */
279
280 static int __cpuinit sysfs_cpu_notify(struct notifier_block *self,
281                                       unsigned long action, void *hcpu)
282 {
283         unsigned int cpu = (unsigned int)(long)hcpu;
284
285         switch (action) {
286         case CPU_ONLINE:
287                 register_cpu_online(cpu);
288                 break;
289 #ifdef CONFIG_HOTPLUG_CPU
290         case CPU_DEAD:
291                 unregister_cpu_online(cpu);
292                 break;
293 #endif
294         }
295         return NOTIFY_OK;
296 }
297
298 static struct notifier_block __cpuinitdata sysfs_cpu_nb = {
299         .notifier_call  = sysfs_cpu_notify,
300 };
301
302 /* NUMA stuff */
303
304 #ifdef CONFIG_NUMA
305 static void register_nodes(void)
306 {
307         int i;
308
309         for (i = 0; i < MAX_NUMNODES; i++)
310                 register_one_node(i);
311 }
312
313 int sysfs_add_device_to_node(struct sys_device *dev, int nid)
314 {
315         struct node *node = &node_devices[nid];
316         return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
317                         kobject_name(&dev->kobj));
318 }
319
320 void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
321 {
322         struct node *node = &node_devices[nid];
323         sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
324 }
325
326 #else
327 static void register_nodes(void)
328 {
329         return;
330 }
331
332 #endif
333
334 EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
335 EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
336
337 /* Only valid if CPU is present. */
338 static ssize_t show_physical_id(struct sys_device *dev, char *buf)
339 {
340         struct cpu *cpu = container_of(dev, struct cpu, sysdev);
341
342         return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
343 }
344 static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
345
346 static int __init topology_init(void)
347 {
348         int cpu;
349
350         register_nodes();
351         register_cpu_notifier(&sysfs_cpu_nb);
352
353         for_each_possible_cpu(cpu) {
354                 struct cpu *c = &per_cpu(cpu_devices, cpu);
355
356                 /*
357                  * For now, we just see if the system supports making
358                  * the RTAS calls for CPU hotplug.  But, there may be a
359                  * more comprehensive way to do this for an individual
360                  * CPU.  For instance, the boot cpu might never be valid
361                  * for hotplugging.
362                  */
363                 if (!ppc_md.cpu_die)
364                         c->no_control = 1;
365
366                 if (cpu_online(cpu) || (c->no_control == 0)) {
367                         register_cpu(c, cpu);
368
369                         sysdev_create_file(&c->sysdev, &attr_physical_id);
370                 }
371
372                 if (cpu_online(cpu))
373                         register_cpu_online(cpu);
374         }
375
376         return 0;
377 }
378 __initcall(topology_init);