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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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100 lines
1.8 KiB
C
100 lines
1.8 KiB
C
/**
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* @file perfmon.c
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*
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* @remark Copyright 2003 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon <levon@movementarian.org>
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*/
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#include <linux/kernel.h>
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#include <linux/oprofile.h>
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#include <linux/sched.h>
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#include <asm/perfmon.h>
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#include <asm/ptrace.h>
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#include <asm/errno.h>
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static int allow_ints;
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static int
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perfmon_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg,
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struct pt_regs *regs, unsigned long stamp)
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{
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int event = arg->pmd_eventid;
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arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1;
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/* the owner of the oprofile event buffer may have exited
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* without perfmon being shutdown (e.g. SIGSEGV)
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*/
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if (allow_ints)
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oprofile_add_sample(regs, event);
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return 0;
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}
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static int perfmon_start(void)
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{
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allow_ints = 1;
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return 0;
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}
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static void perfmon_stop(void)
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{
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allow_ints = 0;
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}
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#define OPROFILE_FMT_UUID { \
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0x77, 0x7a, 0x6e, 0x61, 0x20, 0x65, 0x73, 0x69, 0x74, 0x6e, 0x72, 0x20, 0x61, 0x65, 0x0a, 0x6c }
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static pfm_buffer_fmt_t oprofile_fmt = {
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.fmt_name = "oprofile_format",
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.fmt_uuid = OPROFILE_FMT_UUID,
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.fmt_handler = perfmon_handler,
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};
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static char *get_cpu_type(void)
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{
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__u8 family = local_cpu_data->family;
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switch (family) {
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case 0x07:
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return "ia64/itanium";
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case 0x1f:
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return "ia64/itanium2";
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default:
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return "ia64/ia64";
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}
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}
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/* all the ops are handled via userspace for IA64 perfmon */
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static int using_perfmon;
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int perfmon_init(struct oprofile_operations *ops)
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{
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int ret = pfm_register_buffer_fmt(&oprofile_fmt);
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if (ret)
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return -ENODEV;
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ops->cpu_type = get_cpu_type();
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ops->start = perfmon_start;
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ops->stop = perfmon_stop;
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using_perfmon = 1;
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printk(KERN_INFO "oprofile: using perfmon.\n");
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return 0;
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}
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void perfmon_exit(void)
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{
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if (!using_perfmon)
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return;
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pfm_unregister_buffer_fmt(oprofile_fmt.fmt_uuid);
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}
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