forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge branch 'core' of git://amd64.org/linux/rric into perf/core
- Loading branch information
Showing
11 changed files
with
252 additions
and
94 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file was deleted.
Oops, something went wrong.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| /** | ||
| * @file nmi_timer_int.c | ||
| * | ||
| * @remark Copyright 2011 Advanced Micro Devices, Inc. | ||
| * | ||
| * @author Robert Richter <robert.richter@amd.com> | ||
| */ | ||
|
|
||
| #include <linux/init.h> | ||
| #include <linux/smp.h> | ||
| #include <linux/errno.h> | ||
| #include <linux/oprofile.h> | ||
| #include <linux/perf_event.h> | ||
|
|
||
| #ifdef CONFIG_OPROFILE_NMI_TIMER | ||
|
|
||
| static DEFINE_PER_CPU(struct perf_event *, nmi_timer_events); | ||
| static int ctr_running; | ||
|
|
||
| static struct perf_event_attr nmi_timer_attr = { | ||
| .type = PERF_TYPE_HARDWARE, | ||
| .config = PERF_COUNT_HW_CPU_CYCLES, | ||
| .size = sizeof(struct perf_event_attr), | ||
| .pinned = 1, | ||
| .disabled = 1, | ||
| }; | ||
|
|
||
| static void nmi_timer_callback(struct perf_event *event, | ||
| struct perf_sample_data *data, | ||
| struct pt_regs *regs) | ||
| { | ||
| event->hw.interrupts = 0; /* don't throttle interrupts */ | ||
| oprofile_add_sample(regs, 0); | ||
| } | ||
|
|
||
| static int nmi_timer_start_cpu(int cpu) | ||
| { | ||
| struct perf_event *event = per_cpu(nmi_timer_events, cpu); | ||
|
|
||
| if (!event) { | ||
| event = perf_event_create_kernel_counter(&nmi_timer_attr, cpu, NULL, | ||
| nmi_timer_callback, NULL); | ||
| if (IS_ERR(event)) | ||
| return PTR_ERR(event); | ||
| per_cpu(nmi_timer_events, cpu) = event; | ||
| } | ||
|
|
||
| if (event && ctr_running) | ||
| perf_event_enable(event); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static void nmi_timer_stop_cpu(int cpu) | ||
| { | ||
| struct perf_event *event = per_cpu(nmi_timer_events, cpu); | ||
|
|
||
| if (event && ctr_running) | ||
| perf_event_disable(event); | ||
| } | ||
|
|
||
| static int nmi_timer_cpu_notifier(struct notifier_block *b, unsigned long action, | ||
| void *data) | ||
| { | ||
| int cpu = (unsigned long)data; | ||
| switch (action) { | ||
| case CPU_DOWN_FAILED: | ||
| case CPU_ONLINE: | ||
| nmi_timer_start_cpu(cpu); | ||
| break; | ||
| case CPU_DOWN_PREPARE: | ||
| nmi_timer_stop_cpu(cpu); | ||
| break; | ||
| } | ||
| return NOTIFY_DONE; | ||
| } | ||
|
|
||
| static struct notifier_block nmi_timer_cpu_nb = { | ||
| .notifier_call = nmi_timer_cpu_notifier | ||
| }; | ||
|
|
||
| static int nmi_timer_start(void) | ||
| { | ||
| int cpu; | ||
|
|
||
| get_online_cpus(); | ||
| ctr_running = 1; | ||
| for_each_online_cpu(cpu) | ||
| nmi_timer_start_cpu(cpu); | ||
| put_online_cpus(); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static void nmi_timer_stop(void) | ||
| { | ||
| int cpu; | ||
|
|
||
| get_online_cpus(); | ||
| for_each_online_cpu(cpu) | ||
| nmi_timer_stop_cpu(cpu); | ||
| ctr_running = 0; | ||
| put_online_cpus(); | ||
| } | ||
|
|
||
| static void nmi_timer_shutdown(void) | ||
| { | ||
| struct perf_event *event; | ||
| int cpu; | ||
|
|
||
| get_online_cpus(); | ||
| unregister_cpu_notifier(&nmi_timer_cpu_nb); | ||
| for_each_possible_cpu(cpu) { | ||
| event = per_cpu(nmi_timer_events, cpu); | ||
| if (!event) | ||
| continue; | ||
| perf_event_disable(event); | ||
| per_cpu(nmi_timer_events, cpu) = NULL; | ||
| perf_event_release_kernel(event); | ||
| } | ||
|
|
||
| put_online_cpus(); | ||
| } | ||
|
|
||
| static int nmi_timer_setup(void) | ||
| { | ||
| int cpu, err; | ||
| u64 period; | ||
|
|
||
| /* clock cycles per tick: */ | ||
| period = (u64)cpu_khz * 1000; | ||
| do_div(period, HZ); | ||
| nmi_timer_attr.sample_period = period; | ||
|
|
||
| get_online_cpus(); | ||
| err = register_cpu_notifier(&nmi_timer_cpu_nb); | ||
| if (err) | ||
| goto out; | ||
| /* can't attach events to offline cpus: */ | ||
| for_each_online_cpu(cpu) { | ||
| err = nmi_timer_start_cpu(cpu); | ||
| if (err) | ||
| break; | ||
| } | ||
| if (err) | ||
| nmi_timer_shutdown(); | ||
| out: | ||
| put_online_cpus(); | ||
| return err; | ||
| } | ||
|
|
||
| int __init op_nmi_timer_init(struct oprofile_operations *ops) | ||
| { | ||
| int err = 0; | ||
|
|
||
| err = nmi_timer_setup(); | ||
| if (err) | ||
| return err; | ||
| nmi_timer_shutdown(); /* only check, don't alloc */ | ||
|
|
||
| ops->create_files = NULL; | ||
| ops->setup = nmi_timer_setup; | ||
| ops->shutdown = nmi_timer_shutdown; | ||
| ops->start = nmi_timer_start; | ||
| ops->stop = nmi_timer_stop; | ||
| ops->cpu_type = "timer"; | ||
|
|
||
| printk(KERN_INFO "oprofile: using NMI timer interrupt.\n"); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| #endif |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.