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Make.tags.inc
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Makefile
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bus_if.m
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capabilities.conf
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clock_if.m
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cpufreq_if.m
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device_if.m
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firmw.S
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genassym.sh
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genoffset.c
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genoffset.sh
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imgact_aout.c
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imgact_binmisc.c
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imgact_elf.c
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imgact_elf32.c
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imgact_elf64.c
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imgact_shell.c
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init_main.c
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init_sysent.c
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kern_acct.c
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kern_alq.c
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kern_clock.c
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kern_clocksource.c
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kern_condvar.c
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kern_conf.c
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kern_cons.c
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kern_context.c
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kern_cpu.c
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kern_cpuset.c
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kern_ctf.c
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kern_descrip.c
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kern_dtrace.c
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kern_dump.c
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kern_environment.c
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kern_et.c
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kern_event.c
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kern_exec.c
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kern_exit.c
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kern_fail.c
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kern_ffclock.c
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kern_fork.c
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kern_hhook.c
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kern_idle.c
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kern_intr.c
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kern_jail.c
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kern_kcov.c
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kern_khelp.c
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kern_kthread.c
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kern_ktr.c
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kern_ktrace.c
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kern_linker.c
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kern_lock.c
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kern_lockf.c
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kern_lockstat.c
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kern_loginclass.c
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kern_malloc.c
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kern_mbuf.c
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kern_mib.c
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kern_module.c
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kern_mtxpool.c
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kern_mutex.c
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kern_ntptime.c
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kern_osd.c
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kern_physio.c
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kern_pmc.c
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kern_poll.c
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kern_priv.c
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kern_proc.c
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kern_procctl.c
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kern_prot.c
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kern_racct.c
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kern_rangelock.c
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kern_rctl.c
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kern_resource.c
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kern_rmlock.c
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kern_rwlock.c
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kern_sdt.c
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kern_sema.c
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kern_sendfile.c
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kern_sharedpage.c
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kern_shutdown.c
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kern_sig.c
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kern_switch.c
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kern_sx.c
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kern_synch.c
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kern_syscalls.c
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kern_sysctl.c
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kern_tc.c
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kern_thr.c
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kern_thread.c
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kern_time.c
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kern_timeout.c
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kern_tslog.c
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kern_ubsan.c
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kern_umtx.c
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kern_uuid.c
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kern_xxx.c
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ksched.c
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link_elf.c
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link_elf_obj.c
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linker_if.m
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makesyscalls.sh
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md4c.c
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md5c.c
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msi_if.m
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p1003_1b.c
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pic_if.m
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posix4_mib.c
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sched_4bsd.c
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sched_ule.c
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serdev_if.m
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stack_protector.c
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subr_acl_nfs4.c
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subr_acl_posix1e.c
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subr_atomic64.c
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subr_autoconf.c
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subr_blist.c
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subr_boot.c
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subr_bufring.c
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subr_bus.c
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subr_bus_dma.c
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subr_busdma_bufalloc.c
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subr_capability.c
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subr_clock.c
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subr_compressor.c
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subr_counter.c
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subr_coverage.c
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subr_csan.c
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subr_devmap.c
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subr_devstat.c
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subr_disk.c
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subr_dummy_vdso_tc.c
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subr_early.c
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subr_epoch.c
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subr_eventhandler.c
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subr_fattime.c
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subr_filter.c
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subr_firmware.c
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subr_gtaskqueue.c
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subr_hash.c
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subr_hints.c
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subr_intr.c
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subr_kdb.c
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subr_kobj.c
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subr_lock.c
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subr_log.c
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subr_mchain.c
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subr_module.c
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subr_msgbuf.c
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subr_param.c
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subr_pcpu.c
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subr_pctrie.c
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subr_physmem.c
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subr_pidctrl.c
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subr_power.c
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subr_prf.c
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subr_prng.c
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subr_prof.c
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subr_rangeset.c
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subr_rman.c
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subr_rtc.c
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subr_sbuf.c
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subr_scanf.c
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subr_sfbuf.c
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subr_sglist.c
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subr_sleepqueue.c
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subr_smp.c
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subr_smr.c
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subr_stack.c
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subr_stats.c
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subr_syscall.c
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subr_taskqueue.c
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subr_terminal.c
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subr_trap.c
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subr_turnstile.c
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subr_uio.c
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subr_unit.c
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subr_vmem.c
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subr_witness.c
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sys_capability.c
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sys_eventfd.c
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sys_generic.c
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sys_getrandom.c
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sys_pipe.c
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sys_procdesc.c
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sys_process.c
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sys_socket.c
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syscalls.c
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syscalls.master
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systrace_args.c
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sysv_ipc.c
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sysv_msg.c
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sysv_sem.c
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sysv_shm.c
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tty.c
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tty_compat.c
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tty_info.c
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tty_inq.c
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tty_outq.c
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tty_pts.c
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tty_tty.c
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tty_ttydisc.c
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uipc_accf.c
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uipc_debug.c
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uipc_domain.c
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uipc_ktls.c
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uipc_mbuf.c
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uipc_mbuf2.c
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uipc_mbufhash.c
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uipc_mqueue.c
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uipc_sem.c
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uipc_shm.c
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uipc_sockbuf.c
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uipc_socket.c
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uipc_syscalls.c
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uipc_usrreq.c
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vfs_acl.c
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vfs_aio.c
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vfs_bio.c
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vfs_cache.c
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vfs_cluster.c
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vfs_default.c
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vfs_export.c
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vfs_extattr.c
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vfs_hash.c
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vfs_init.c
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vfs_lookup.c
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vfs_mount.c
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vfs_mountroot.c
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vfs_subr.c
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vfs_syscalls.c
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vfs_vnops.c
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vnode_if.src
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Editing: kern_ffclock.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2011 The University of Melbourne * All rights reserved. * * This software was developed by Julien Ridoux at the University of Melbourne * under sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include "opt_ffclock.h" #include <sys/param.h> #include <sys/bus.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/module.h> #include <sys/mutex.h> #include <sys/priv.h> #include <sys/proc.h> #include <sys/sbuf.h> #include <sys/sysent.h> #include <sys/sysproto.h> #include <sys/sysctl.h> #include <sys/systm.h> #include <sys/timeffc.h> #ifdef FFCLOCK FEATURE(ffclock, "Feed-forward clock support"); extern struct ffclock_estimate ffclock_estimate; extern struct bintime ffclock_boottime; extern int8_t ffclock_updated; extern struct mtx ffclock_mtx; /* * Feed-forward clock absolute time. This should be the preferred way to read * the feed-forward clock for "wall-clock" type time. The flags allow to compose * various flavours of absolute time (e.g. with or without leap seconds taken * into account). If valid pointers are provided, the ffcounter value and an * upper bound on clock error associated with the bintime are provided. * NOTE: use ffclock_convert_abs() to differ the conversion of a ffcounter value * read earlier. */ void ffclock_abstime(ffcounter *ffcount, struct bintime *bt, struct bintime *error_bound, uint32_t flags) { struct ffclock_estimate cest; ffcounter ffc; ffcounter update_ffcount; ffcounter ffdelta_error; /* Get counter and corresponding time. */ if ((flags & FFCLOCK_FAST) == FFCLOCK_FAST) ffclock_last_tick(&ffc, bt, flags); else { ffclock_read_counter(&ffc); ffclock_convert_abs(ffc, bt, flags); } /* Current ffclock estimate, use update_ffcount as generation number. */ do { update_ffcount = ffclock_estimate.update_ffcount; bcopy(&ffclock_estimate, &cest, sizeof(struct ffclock_estimate)); } while (update_ffcount != ffclock_estimate.update_ffcount); /* * Leap second adjustment. Total as seen by synchronisation algorithm * since it started. cest.leapsec_next is the ffcounter prediction of * when the next leapsecond occurs. */ if ((flags & FFCLOCK_LEAPSEC) == FFCLOCK_LEAPSEC) { bt->sec -= cest.leapsec_total; if (ffc > cest.leapsec_next) bt->sec -= cest.leapsec; } /* Boot time adjustment, for uptime/monotonic clocks. */ if ((flags & FFCLOCK_UPTIME) == FFCLOCK_UPTIME) { bintime_sub(bt, &ffclock_boottime); } /* Compute error bound if a valid pointer has been passed. */ if (error_bound) { ffdelta_error = ffc - cest.update_ffcount; ffclock_convert_diff(ffdelta_error, error_bound); /* 18446744073709 = int(2^64/1e12), err_bound_rate in [ps/s] */ bintime_mul(error_bound, cest.errb_rate * (uint64_t)18446744073709LL); /* 18446744073 = int(2^64 / 1e9), since err_abs in [ns] */ bintime_addx(error_bound, cest.errb_abs * (uint64_t)18446744073LL); } if (ffcount) *ffcount = ffc; } /* * Feed-forward difference clock. This should be the preferred way to convert a * time interval in ffcounter values into a time interval in seconds. If a valid * pointer is passed, an upper bound on the error in computing the time interval * in seconds is provided. */ void ffclock_difftime(ffcounter ffdelta, struct bintime *bt, struct bintime *error_bound) { ffcounter update_ffcount; uint32_t err_rate; ffclock_convert_diff(ffdelta, bt); if (error_bound) { do { update_ffcount = ffclock_estimate.update_ffcount; err_rate = ffclock_estimate.errb_rate; } while (update_ffcount != ffclock_estimate.update_ffcount); ffclock_convert_diff(ffdelta, error_bound); /* 18446744073709 = int(2^64/1e12), err_bound_rate in [ps/s] */ bintime_mul(error_bound, err_rate * (uint64_t)18446744073709LL); } } /* * Create a new kern.sysclock sysctl node, which will be home to some generic * sysclock configuration variables. Feed-forward clock specific variables will * live under the ffclock subnode. */ SYSCTL_NODE(_kern, OID_AUTO, sysclock, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "System clock related configuration"); SYSCTL_NODE(_kern_sysclock, OID_AUTO, ffclock, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "Feed-forward clock configuration"); static char *sysclocks[] = {"feedback", "feed-forward"}; #define MAX_SYSCLOCK_NAME_LEN 16 #define NUM_SYSCLOCKS nitems(sysclocks) static int ffclock_version = 2; SYSCTL_INT(_kern_sysclock_ffclock, OID_AUTO, version, CTLFLAG_RD, &ffclock_version, 0, "Feed-forward clock kernel version"); /* List available sysclocks. */ static int sysctl_kern_sysclock_available(SYSCTL_HANDLER_ARGS) { struct sbuf *s; int clk, error; s = sbuf_new_for_sysctl(NULL, NULL, MAX_SYSCLOCK_NAME_LEN * NUM_SYSCLOCKS, req); if (s == NULL) return (ENOMEM); for (clk = 0; clk < NUM_SYSCLOCKS; clk++) { sbuf_cat(s, sysclocks[clk]); if (clk + 1 < NUM_SYSCLOCKS) sbuf_cat(s, " "); } error = sbuf_finish(s); sbuf_delete(s); return (error); } SYSCTL_PROC(_kern_sysclock, OID_AUTO, available, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 0, 0, sysctl_kern_sysclock_available, "A", "List of available system clocks"); /* * Return the name of the active system clock if read, or attempt to change * the active system clock to the user specified one if written to. The active * system clock is read when calling any of the [get]{bin,nano,micro}[up]time() * functions. */ static int sysctl_kern_sysclock_active(SYSCTL_HANDLER_ARGS) { char newclock[MAX_SYSCLOCK_NAME_LEN]; int error; int clk; /* Return the name of the current active sysclock. */ strlcpy(newclock, sysclocks[sysclock_active], sizeof(newclock)); error = sysctl_handle_string(oidp, newclock, sizeof(newclock), req); /* Check for error or no change */ if (error != 0 || req->newptr == NULL) goto done; /* Change the active sysclock to the user specified one: */ error = EINVAL; for (clk = 0; clk < NUM_SYSCLOCKS; clk++) { if (strncmp(newclock, sysclocks[clk], MAX_SYSCLOCK_NAME_LEN - 1)) { continue; } sysclock_active = clk; error = 0; break; } done: return (error); } SYSCTL_PROC(_kern_sysclock, OID_AUTO, active, CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0, sysctl_kern_sysclock_active, "A", "Name of the active system clock which is currently serving time"); static int sysctl_kern_ffclock_ffcounter_bypass = 0; SYSCTL_INT(_kern_sysclock_ffclock, OID_AUTO, ffcounter_bypass, CTLFLAG_RW, &sysctl_kern_ffclock_ffcounter_bypass, 0, "Use reliable hardware timecounter as the feed-forward counter"); /* * High level functions to access the Feed-Forward Clock. */ void ffclock_bintime(struct bintime *bt) { ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC); } void ffclock_nanotime(struct timespec *tsp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC); bintime2timespec(&bt, tsp); } void ffclock_microtime(struct timeval *tvp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC); bintime2timeval(&bt, tvp); } void ffclock_getbintime(struct bintime *bt) { ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST); } void ffclock_getnanotime(struct timespec *tsp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST); bintime2timespec(&bt, tsp); } void ffclock_getmicrotime(struct timeval *tvp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_LEAPSEC | FFCLOCK_FAST); bintime2timeval(&bt, tvp); } void ffclock_binuptime(struct bintime *bt) { ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME); } void ffclock_nanouptime(struct timespec *tsp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME); bintime2timespec(&bt, tsp); } void ffclock_microuptime(struct timeval *tvp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME); bintime2timeval(&bt, tvp); } void ffclock_getbinuptime(struct bintime *bt) { ffclock_abstime(NULL, bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST); } void ffclock_getnanouptime(struct timespec *tsp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST); bintime2timespec(&bt, tsp); } void ffclock_getmicrouptime(struct timeval *tvp) { struct bintime bt; ffclock_abstime(NULL, &bt, NULL, FFCLOCK_LERP | FFCLOCK_UPTIME | FFCLOCK_FAST); bintime2timeval(&bt, tvp); } void ffclock_bindifftime(ffcounter ffdelta, struct bintime *bt) { ffclock_difftime(ffdelta, bt, NULL); } void ffclock_nanodifftime(ffcounter ffdelta, struct timespec *tsp) { struct bintime bt; ffclock_difftime(ffdelta, &bt, NULL); bintime2timespec(&bt, tsp); } void ffclock_microdifftime(ffcounter ffdelta, struct timeval *tvp) { struct bintime bt; ffclock_difftime(ffdelta, &bt, NULL); bintime2timeval(&bt, tvp); } /* * System call allowing userland applications to retrieve the current value of * the Feed-Forward Clock counter. */ #ifndef _SYS_SYSPROTO_H_ struct ffclock_getcounter_args { ffcounter *ffcount; }; #endif /* ARGSUSED */ int sys_ffclock_getcounter(struct thread *td, struct ffclock_getcounter_args *uap) { ffcounter ffcount; int error; ffcount = 0; ffclock_read_counter(&ffcount); if (ffcount == 0) return (EAGAIN); error = copyout(&ffcount, uap->ffcount, sizeof(ffcounter)); return (error); } /* * System call allowing the synchronisation daemon to push new feed-foward clock * estimates to the kernel. Acquire ffclock_mtx to prevent concurrent updates * and ensure data consistency. * NOTE: ffclock_updated signals the fftimehands that new estimates are * available. The updated estimates are picked up by the fftimehands on next * tick, which could take as long as 1/hz seconds (if ticks are not missed). */ #ifndef _SYS_SYSPROTO_H_ struct ffclock_setestimate_args { struct ffclock_estimate *cest; }; #endif /* ARGSUSED */ int sys_ffclock_setestimate(struct thread *td, struct ffclock_setestimate_args *uap) { struct ffclock_estimate cest; int error; /* Reuse of PRIV_CLOCK_SETTIME. */ if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0) return (error); if ((error = copyin(uap->cest, &cest, sizeof(struct ffclock_estimate))) != 0) return (error); mtx_lock(&ffclock_mtx); memcpy(&ffclock_estimate, &cest, sizeof(struct ffclock_estimate)); ffclock_updated++; mtx_unlock(&ffclock_mtx); return (error); } /* * System call allowing userland applications to retrieve the clock estimates * stored within the kernel. It is useful to kickstart the synchronisation * daemon with the kernel's knowledge of hardware timecounter. */ #ifndef _SYS_SYSPROTO_H_ struct ffclock_getestimate_args { struct ffclock_estimate *cest; }; #endif /* ARGSUSED */ int sys_ffclock_getestimate(struct thread *td, struct ffclock_getestimate_args *uap) { struct ffclock_estimate cest; int error; mtx_lock(&ffclock_mtx); memcpy(&cest, &ffclock_estimate, sizeof(struct ffclock_estimate)); mtx_unlock(&ffclock_mtx); error = copyout(&cest, uap->cest, sizeof(struct ffclock_estimate)); return (error); } #else /* !FFCLOCK */ int sys_ffclock_getcounter(struct thread *td, struct ffclock_getcounter_args *uap) { return (ENOSYS); } int sys_ffclock_setestimate(struct thread *td, struct ffclock_setestimate_args *uap) { return (ENOSYS); } int sys_ffclock_getestimate(struct thread *td, struct ffclock_getestimate_args *uap) { return (ENOSYS); } #endif /* FFCLOCK */
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