diff options
Diffstat (limited to 'drivers/oprofile/nmi_timer_int.c')
-rw-r--r-- | drivers/oprofile/nmi_timer_int.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/drivers/oprofile/nmi_timer_int.c b/drivers/oprofile/nmi_timer_int.c deleted file mode 100644 index f343bd96609a..000000000000 --- a/drivers/oprofile/nmi_timer_int.c +++ /dev/null @@ -1,157 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/** - * @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_online(unsigned int cpu) -{ - nmi_timer_start_cpu(cpu); - return 0; -} -static int nmi_timer_cpu_predown(unsigned int cpu) -{ - nmi_timer_stop_cpu(cpu); - return 0; -} - -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 enum cpuhp_state hp_online; - -static void nmi_timer_shutdown(void) -{ - struct perf_event *event; - int cpu; - - cpuhp_remove_state(hp_online); - 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); - } -} - -static int nmi_timer_setup(void) -{ - int err; - u64 period; - - /* clock cycles per tick: */ - period = (u64)cpu_khz * 1000; - do_div(period, HZ); - nmi_timer_attr.sample_period = period; - - err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "oprofile/nmi:online", - nmi_timer_cpu_online, nmi_timer_cpu_predown); - if (err < 0) { - nmi_timer_shutdown(); - return err; - } - hp_online = err; - return 0; -} - -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 |