4 * @remark Copyright 2002-2009 OProfile authors
5 * @remark Read the file COPYING
7 * @author John Levon <levon@movementarian.org>
8 * @author Robert Richter <robert.richter@amd.com>
9 * @author Barry Kasindorf <barry.kasindorf@amd.com>
10 * @author Jason Yeh <jason.yeh@amd.com>
11 * @author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
14 #include <linux/init.h>
15 #include <linux/notifier.h>
16 #include <linux/smp.h>
17 #include <linux/oprofile.h>
18 #include <linux/sysdev.h>
19 #include <linux/slab.h>
20 #include <linux/moduleparam.h>
21 #include <linux/kdebug.h>
22 #include <linux/cpu.h>
27 #include "op_counter.h"
28 #include "op_x86_model.h"
30 static struct op_x86_model_spec
*model
;
31 static DEFINE_PER_CPU(struct op_msrs
, cpu_msrs
);
32 static DEFINE_PER_CPU(unsigned long, saved_lvtpc
);
34 /* 0 == registered but off, 1 == registered and on */
35 static int nmi_enabled
= 0;
37 struct op_counter_config counter_config
[OP_MAX_COUNTER
];
39 /* common functions */
41 u64
op_x86_get_ctrl(struct op_x86_model_spec
const *model
,
42 struct op_counter_config
*counter_config
)
45 u16 event
= (u16
)counter_config
->event
;
47 val
|= ARCH_PERFMON_EVENTSEL_INT
;
48 val
|= counter_config
->user
? ARCH_PERFMON_EVENTSEL_USR
: 0;
49 val
|= counter_config
->kernel
? ARCH_PERFMON_EVENTSEL_OS
: 0;
50 val
|= (counter_config
->unit_mask
& 0xFF) << 8;
51 event
&= model
->event_mask
? model
->event_mask
: 0xFF;
53 val
|= (event
& 0x0F00) << 24;
59 static int profile_exceptions_notify(struct notifier_block
*self
,
60 unsigned long val
, void *data
)
62 struct die_args
*args
= (struct die_args
*)data
;
63 int ret
= NOTIFY_DONE
;
64 int cpu
= smp_processor_id();
69 model
->check_ctrs(args
->regs
, &per_cpu(cpu_msrs
, cpu
));
78 static void nmi_cpu_save_registers(struct op_msrs
*msrs
)
80 struct op_msr
*counters
= msrs
->counters
;
81 struct op_msr
*controls
= msrs
->controls
;
84 for (i
= 0; i
< model
->num_counters
; ++i
) {
86 rdmsrl(counters
[i
].addr
, counters
[i
].saved
);
89 for (i
= 0; i
< model
->num_controls
; ++i
) {
91 rdmsrl(controls
[i
].addr
, controls
[i
].saved
);
95 static void nmi_cpu_start(void *dummy
)
97 struct op_msrs
const *msrs
= &__get_cpu_var(cpu_msrs
);
101 static int nmi_start(void)
103 on_each_cpu(nmi_cpu_start
, NULL
, 1);
107 static void nmi_cpu_stop(void *dummy
)
109 struct op_msrs
const *msrs
= &__get_cpu_var(cpu_msrs
);
113 static void nmi_stop(void)
115 on_each_cpu(nmi_cpu_stop
, NULL
, 1);
118 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
120 static DEFINE_PER_CPU(int, switch_index
);
122 static inline int has_mux(void)
124 return !!model
->switch_ctrl
;
127 inline int op_x86_phys_to_virt(int phys
)
129 return __get_cpu_var(switch_index
) + phys
;
132 inline int op_x86_virt_to_phys(int virt
)
134 return virt
% model
->num_counters
;
137 static void nmi_shutdown_mux(void)
144 for_each_possible_cpu(i
) {
145 kfree(per_cpu(cpu_msrs
, i
).multiplex
);
146 per_cpu(cpu_msrs
, i
).multiplex
= NULL
;
147 per_cpu(switch_index
, i
) = 0;
151 static int nmi_setup_mux(void)
153 size_t multiplex_size
=
154 sizeof(struct op_msr
) * model
->num_virt_counters
;
160 for_each_possible_cpu(i
) {
161 per_cpu(cpu_msrs
, i
).multiplex
=
162 kzalloc(multiplex_size
, GFP_KERNEL
);
163 if (!per_cpu(cpu_msrs
, i
).multiplex
)
170 static void nmi_cpu_setup_mux(int cpu
, struct op_msrs
const * const msrs
)
173 struct op_msr
*multiplex
= msrs
->multiplex
;
178 for (i
= 0; i
< model
->num_virt_counters
; ++i
) {
179 if (counter_config
[i
].enabled
) {
180 multiplex
[i
].saved
= -(u64
)counter_config
[i
].count
;
182 multiplex
[i
].saved
= 0;
186 per_cpu(switch_index
, cpu
) = 0;
189 static void nmi_cpu_save_mpx_registers(struct op_msrs
*msrs
)
191 struct op_msr
*counters
= msrs
->counters
;
192 struct op_msr
*multiplex
= msrs
->multiplex
;
195 for (i
= 0; i
< model
->num_counters
; ++i
) {
196 int virt
= op_x86_phys_to_virt(i
);
197 if (counters
[i
].addr
)
198 rdmsrl(counters
[i
].addr
, multiplex
[virt
].saved
);
202 static void nmi_cpu_restore_mpx_registers(struct op_msrs
*msrs
)
204 struct op_msr
*counters
= msrs
->counters
;
205 struct op_msr
*multiplex
= msrs
->multiplex
;
208 for (i
= 0; i
< model
->num_counters
; ++i
) {
209 int virt
= op_x86_phys_to_virt(i
);
210 if (counters
[i
].addr
)
211 wrmsrl(counters
[i
].addr
, multiplex
[virt
].saved
);
215 static void nmi_cpu_switch(void *dummy
)
217 int cpu
= smp_processor_id();
218 int si
= per_cpu(switch_index
, cpu
);
219 struct op_msrs
*msrs
= &per_cpu(cpu_msrs
, cpu
);
222 nmi_cpu_save_mpx_registers(msrs
);
224 /* move to next set */
225 si
+= model
->num_counters
;
226 if ((si
>= model
->num_virt_counters
) || (counter_config
[si
].count
== 0))
227 per_cpu(switch_index
, cpu
) = 0;
229 per_cpu(switch_index
, cpu
) = si
;
231 model
->switch_ctrl(model
, msrs
);
232 nmi_cpu_restore_mpx_registers(msrs
);
239 * Quick check to see if multiplexing is necessary.
240 * The check should be sufficient since counters are used
243 static int nmi_multiplex_on(void)
245 return counter_config
[model
->num_counters
].count
? 0 : -EINVAL
;
248 static int nmi_switch_event(void)
251 return -ENOSYS
; /* not implemented */
252 if (nmi_multiplex_on() < 0)
253 return -EINVAL
; /* not necessary */
255 on_each_cpu(nmi_cpu_switch
, NULL
, 1);
260 static inline void mux_init(struct oprofile_operations
*ops
)
263 ops
->switch_events
= nmi_switch_event
;
266 static void mux_clone(int cpu
)
271 memcpy(per_cpu(cpu_msrs
, cpu
).multiplex
,
272 per_cpu(cpu_msrs
, 0).multiplex
,
273 sizeof(struct op_msr
) * model
->num_virt_counters
);
278 inline int op_x86_phys_to_virt(int phys
) { return phys
; }
279 inline int op_x86_virt_to_phys(int virt
) { return virt
; }
280 static inline void nmi_shutdown_mux(void) { }
281 static inline int nmi_setup_mux(void) { return 1; }
283 nmi_cpu_setup_mux(int cpu
, struct op_msrs
const * const msrs
) { }
284 static inline void mux_init(struct oprofile_operations
*ops
) { }
285 static void mux_clone(int cpu
) { }
289 static void free_msrs(void)
292 for_each_possible_cpu(i
) {
293 kfree(per_cpu(cpu_msrs
, i
).counters
);
294 per_cpu(cpu_msrs
, i
).counters
= NULL
;
295 kfree(per_cpu(cpu_msrs
, i
).controls
);
296 per_cpu(cpu_msrs
, i
).controls
= NULL
;
300 static int allocate_msrs(void)
302 size_t controls_size
= sizeof(struct op_msr
) * model
->num_controls
;
303 size_t counters_size
= sizeof(struct op_msr
) * model
->num_counters
;
306 for_each_possible_cpu(i
) {
307 per_cpu(cpu_msrs
, i
).counters
= kzalloc(counters_size
,
309 if (!per_cpu(cpu_msrs
, i
).counters
)
311 per_cpu(cpu_msrs
, i
).controls
= kzalloc(controls_size
,
313 if (!per_cpu(cpu_msrs
, i
).controls
)
320 static void nmi_cpu_setup(void *dummy
)
322 int cpu
= smp_processor_id();
323 struct op_msrs
*msrs
= &per_cpu(cpu_msrs
, cpu
);
324 nmi_cpu_save_registers(msrs
);
325 spin_lock(&oprofilefs_lock
);
326 model
->setup_ctrs(model
, msrs
);
327 nmi_cpu_setup_mux(cpu
, msrs
);
328 spin_unlock(&oprofilefs_lock
);
329 per_cpu(saved_lvtpc
, cpu
) = apic_read(APIC_LVTPC
);
330 apic_write(APIC_LVTPC
, APIC_DM_NMI
);
333 static struct notifier_block profile_exceptions_nb
= {
334 .notifier_call
= profile_exceptions_notify
,
339 static int nmi_setup(void)
344 if (!allocate_msrs())
346 else if (!nmi_setup_mux())
349 err
= register_die_notifier(&profile_exceptions_nb
);
357 /* We need to serialize save and setup for HT because the subset
358 * of msrs are distinct for save and setup operations
361 /* Assume saved/restored counters are the same on all CPUs */
362 model
->fill_in_addresses(&per_cpu(cpu_msrs
, 0));
363 for_each_possible_cpu(cpu
) {
367 memcpy(per_cpu(cpu_msrs
, cpu
).counters
,
368 per_cpu(cpu_msrs
, 0).counters
,
369 sizeof(struct op_msr
) * model
->num_counters
);
371 memcpy(per_cpu(cpu_msrs
, cpu
).controls
,
372 per_cpu(cpu_msrs
, 0).controls
,
373 sizeof(struct op_msr
) * model
->num_controls
);
377 on_each_cpu(nmi_cpu_setup
, NULL
, 1);
382 static void nmi_cpu_restore_registers(struct op_msrs
*msrs
)
384 struct op_msr
*counters
= msrs
->counters
;
385 struct op_msr
*controls
= msrs
->controls
;
388 for (i
= 0; i
< model
->num_controls
; ++i
) {
389 if (controls
[i
].addr
)
390 wrmsrl(controls
[i
].addr
, controls
[i
].saved
);
393 for (i
= 0; i
< model
->num_counters
; ++i
) {
394 if (counters
[i
].addr
)
395 wrmsrl(counters
[i
].addr
, counters
[i
].saved
);
399 static void nmi_cpu_shutdown(void *dummy
)
402 int cpu
= smp_processor_id();
403 struct op_msrs
*msrs
= &per_cpu(cpu_msrs
, cpu
);
405 /* restoring APIC_LVTPC can trigger an apic error because the delivery
406 * mode and vector nr combination can be illegal. That's by design: on
407 * power on apic lvt contain a zero vector nr which are legal only for
408 * NMI delivery mode. So inhibit apic err before restoring lvtpc
410 v
= apic_read(APIC_LVTERR
);
411 apic_write(APIC_LVTERR
, v
| APIC_LVT_MASKED
);
412 apic_write(APIC_LVTPC
, per_cpu(saved_lvtpc
, cpu
));
413 apic_write(APIC_LVTERR
, v
);
414 nmi_cpu_restore_registers(msrs
);
417 static void nmi_shutdown(void)
419 struct op_msrs
*msrs
;
422 on_each_cpu(nmi_cpu_shutdown
, NULL
, 1);
423 unregister_die_notifier(&profile_exceptions_nb
);
425 msrs
= &get_cpu_var(cpu_msrs
);
426 model
->shutdown(msrs
);
428 put_cpu_var(cpu_msrs
);
431 static int nmi_create_files(struct super_block
*sb
, struct dentry
*root
)
435 for (i
= 0; i
< model
->num_virt_counters
; ++i
) {
439 /* quick little hack to _not_ expose a counter if it is not
440 * available for use. This should protect userspace app.
441 * NOTE: assumes 1:1 mapping here (that counters are organized
442 * sequentially in their struct assignment).
444 if (!avail_to_resrv_perfctr_nmi_bit(op_x86_virt_to_phys(i
)))
447 snprintf(buf
, sizeof(buf
), "%d", i
);
448 dir
= oprofilefs_mkdir(sb
, root
, buf
);
449 oprofilefs_create_ulong(sb
, dir
, "enabled", &counter_config
[i
].enabled
);
450 oprofilefs_create_ulong(sb
, dir
, "event", &counter_config
[i
].event
);
451 oprofilefs_create_ulong(sb
, dir
, "count", &counter_config
[i
].count
);
452 oprofilefs_create_ulong(sb
, dir
, "unit_mask", &counter_config
[i
].unit_mask
);
453 oprofilefs_create_ulong(sb
, dir
, "kernel", &counter_config
[i
].kernel
);
454 oprofilefs_create_ulong(sb
, dir
, "user", &counter_config
[i
].user
);
461 static int oprofile_cpu_notifier(struct notifier_block
*b
, unsigned long action
,
464 int cpu
= (unsigned long)data
;
466 case CPU_DOWN_FAILED
:
468 smp_call_function_single(cpu
, nmi_cpu_start
, NULL
, 0);
470 case CPU_DOWN_PREPARE
:
471 smp_call_function_single(cpu
, nmi_cpu_stop
, NULL
, 1);
477 static struct notifier_block oprofile_cpu_nb
= {
478 .notifier_call
= oprofile_cpu_notifier
484 static int nmi_suspend(struct sys_device
*dev
, pm_message_t state
)
486 /* Only one CPU left, just stop that one */
487 if (nmi_enabled
== 1)
492 static int nmi_resume(struct sys_device
*dev
)
494 if (nmi_enabled
== 1)
499 static struct sysdev_class oprofile_sysclass
= {
501 .resume
= nmi_resume
,
502 .suspend
= nmi_suspend
,
505 static struct sys_device device_oprofile
= {
507 .cls
= &oprofile_sysclass
,
510 static int __init
init_sysfs(void)
514 error
= sysdev_class_register(&oprofile_sysclass
);
516 error
= sysdev_register(&device_oprofile
);
520 static void exit_sysfs(void)
522 sysdev_unregister(&device_oprofile
);
523 sysdev_class_unregister(&oprofile_sysclass
);
527 #define init_sysfs() do { } while (0)
528 #define exit_sysfs() do { } while (0)
529 #endif /* CONFIG_PM */
531 static int __init
p4_init(char **cpu_type
)
533 __u8 cpu_model
= boot_cpu_data
.x86_model
;
535 if (cpu_model
> 6 || cpu_model
== 5)
539 *cpu_type
= "i386/p4";
543 switch (smp_num_siblings
) {
545 *cpu_type
= "i386/p4";
550 *cpu_type
= "i386/p4-ht";
551 model
= &op_p4_ht2_spec
;
556 printk(KERN_INFO
"oprofile: P4 HyperThreading detected with > 2 threads\n");
557 printk(KERN_INFO
"oprofile: Reverting to timer mode.\n");
561 static int force_arch_perfmon
;
562 static int force_cpu_type(const char *str
, struct kernel_param
*kp
)
564 if (!strcmp(str
, "arch_perfmon")) {
565 force_arch_perfmon
= 1;
566 printk(KERN_INFO
"oprofile: forcing architectural perfmon\n");
571 module_param_call(cpu_type
, force_cpu_type
, NULL
, NULL
, 0);
573 static int __init
ppro_init(char **cpu_type
)
575 __u8 cpu_model
= boot_cpu_data
.x86_model
;
576 struct op_x86_model_spec
*spec
= &op_ppro_spec
; /* default */
578 if (force_arch_perfmon
&& cpu_has_arch_perfmon
)
583 *cpu_type
= "i386/ppro";
586 *cpu_type
= "i386/pii";
590 *cpu_type
= "i386/piii";
594 *cpu_type
= "i386/p6_mobile";
597 *cpu_type
= "i386/core";
600 *cpu_type
= "i386/core_2";
604 spec
= &op_arch_perfmon_spec
;
605 *cpu_type
= "i386/core_i7";
608 *cpu_type
= "i386/atom";
619 /* in order to get sysfs right */
620 static int using_nmi
;
622 int __init
op_nmi_init(struct oprofile_operations
*ops
)
624 __u8 vendor
= boot_cpu_data
.x86_vendor
;
625 __u8 family
= boot_cpu_data
.x86
;
626 char *cpu_type
= NULL
;
634 /* Needs to be at least an Athlon (or hammer in 32bit mode) */
638 cpu_type
= "i386/athlon";
642 * Actually it could be i386/hammer too, but
643 * give user space an consistent name.
645 cpu_type
= "x86-64/hammer";
648 cpu_type
= "x86-64/family10";
651 cpu_type
= "x86-64/family11h";
656 model
= &op_amd_spec
;
659 case X86_VENDOR_INTEL
:
666 /* A P6-class processor */
668 ppro_init(&cpu_type
);
678 if (!cpu_has_arch_perfmon
)
681 /* use arch perfmon as fallback */
682 cpu_type
= "i386/arch_perfmon";
683 model
= &op_arch_perfmon_spec
;
691 register_cpu_notifier(&oprofile_cpu_nb
);
693 /* default values, can be overwritten by model */
694 ops
->create_files
= nmi_create_files
;
695 ops
->setup
= nmi_setup
;
696 ops
->shutdown
= nmi_shutdown
;
697 ops
->start
= nmi_start
;
698 ops
->stop
= nmi_stop
;
699 ops
->cpu_type
= cpu_type
;
702 ret
= model
->init(ops
);
706 if (!model
->num_virt_counters
)
707 model
->num_virt_counters
= model
->num_counters
;
713 printk(KERN_INFO
"oprofile: using NMI interrupt.\n");
717 void op_nmi_exit(void)
722 unregister_cpu_notifier(&oprofile_cpu_nb
);