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