diff options
Diffstat (limited to 'arch/s390/kernel/time.c')
| -rw-r--r-- | arch/s390/kernel/time.c | 1053 |
1 files changed, 54 insertions, 999 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index 9409d32f2..4e9949800 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -39,13 +39,14 @@ #include <linux/gfp.h> #include <linux/kprobes.h> #include <asm/uaccess.h> +#include <asm/facility.h> #include <asm/delay.h> #include <asm/div64.h> #include <asm/vdso.h> #include <asm/irq.h> #include <asm/irq_regs.h> #include <asm/vtimer.h> -#include <asm/etr.h> +#include <asm/stp.h> #include <asm/cio.h> #include "entry.h" @@ -61,6 +62,32 @@ static DEFINE_PER_CPU(struct clock_event_device, comparators); ATOMIC_NOTIFIER_HEAD(s390_epoch_delta_notifier); EXPORT_SYMBOL(s390_epoch_delta_notifier); +unsigned char ptff_function_mask[16]; +unsigned long lpar_offset; +unsigned long initial_leap_seconds; + +/* + * Get time offsets with PTFF + */ +void __init ptff_init(void) +{ + struct ptff_qto qto; + struct ptff_qui qui; + + if (!test_facility(28)) + return; + ptff(&ptff_function_mask, sizeof(ptff_function_mask), PTFF_QAF); + + /* get LPAR offset */ + if (ptff_query(PTFF_QTO) && ptff(&qto, sizeof(qto), PTFF_QTO) == 0) + lpar_offset = qto.tod_epoch_difference; + + /* get initial leap seconds */ + if (ptff_query(PTFF_QUI) && ptff(&qui, sizeof(qui), PTFF_QUI) == 0) + initial_leap_seconds = (unsigned long) + ((long) qui.old_leap * 4096000000L); +} + /* * Scheduler clock - returns current time in nanosec units. */ @@ -162,30 +189,32 @@ static void clock_comparator_interrupt(struct ext_code ext_code, set_clock_comparator(S390_lowcore.clock_comparator); } -static void etr_timing_alert(struct etr_irq_parm *); static void stp_timing_alert(struct stp_irq_parm *); static void timing_alert_interrupt(struct ext_code ext_code, unsigned int param32, unsigned long param64) { inc_irq_stat(IRQEXT_TLA); - if (param32 & 0x00c40000) - etr_timing_alert((struct etr_irq_parm *) ¶m32); if (param32 & 0x00038000) stp_timing_alert((struct stp_irq_parm *) ¶m32); } -static void etr_reset(void); static void stp_reset(void); void read_persistent_clock64(struct timespec64 *ts) { - tod_to_timeval(get_tod_clock() - TOD_UNIX_EPOCH, ts); + __u64 clock; + + clock = get_tod_clock() - initial_leap_seconds; + tod_to_timeval(clock - TOD_UNIX_EPOCH, ts); } void read_boot_clock64(struct timespec64 *ts) { - tod_to_timeval(sched_clock_base_cc - TOD_UNIX_EPOCH, ts); + __u64 clock; + + clock = sched_clock_base_cc - initial_leap_seconds; + tod_to_timeval(clock - TOD_UNIX_EPOCH, ts); } static cycle_t read_tod_clock(struct clocksource *cs) @@ -269,7 +298,6 @@ void update_vsyscall_tz(void) void __init time_init(void) { /* Reset time synchronization interfaces. */ - etr_reset(); stp_reset(); /* request the clock comparator external interrupt */ @@ -337,20 +365,20 @@ static unsigned long clock_sync_flags; #define CLOCK_SYNC_STP 3 /* - * The synchronous get_clock function. It will write the current clock - * value to the clock pointer and return 0 if the clock is in sync with - * the external time source. If the clock mode is local it will return - * -EOPNOTSUPP and -EAGAIN if the clock is not in sync with the external - * reference. + * The get_clock function for the physical clock. It will get the current + * TOD clock, subtract the LPAR offset and write the result to *clock. + * The function returns 0 if the clock is in sync with the external time + * source. If the clock mode is local it will return -EOPNOTSUPP and + * -EAGAIN if the clock is not in sync with the external reference. */ -int get_sync_clock(unsigned long long *clock) +int get_phys_clock(unsigned long long *clock) { atomic_t *sw_ptr; unsigned int sw0, sw1; sw_ptr = &get_cpu_var(clock_sync_word); sw0 = atomic_read(sw_ptr); - *clock = get_tod_clock(); + *clock = get_tod_clock() - lpar_offset; sw1 = atomic_read(sw_ptr); put_cpu_var(clock_sync_word); if (sw0 == sw1 && (sw0 & 0x80000000U)) @@ -364,7 +392,7 @@ int get_sync_clock(unsigned long long *clock) return -EACCES; return -EAGAIN; } -EXPORT_SYMBOL(get_sync_clock); +EXPORT_SYMBOL(get_phys_clock); /* * Make get_sync_clock return -EAGAIN. @@ -416,301 +444,6 @@ static void __init time_init_wq(void) time_sync_wq = create_singlethread_workqueue("timesync"); } -/* - * External Time Reference (ETR) code. - */ -static int etr_port0_online; -static int etr_port1_online; -static int etr_steai_available; - -static int __init early_parse_etr(char *p) -{ - if (strncmp(p, "off", 3) == 0) - etr_port0_online = etr_port1_online = 0; - else if (strncmp(p, "port0", 5) == 0) - etr_port0_online = 1; - else if (strncmp(p, "port1", 5) == 0) - etr_port1_online = 1; - else if (strncmp(p, "on", 2) == 0) - etr_port0_online = etr_port1_online = 1; - return 0; -} -early_param("etr", early_parse_etr); - -enum etr_event { - ETR_EVENT_PORT0_CHANGE, - ETR_EVENT_PORT1_CHANGE, - ETR_EVENT_PORT_ALERT, - ETR_EVENT_SYNC_CHECK, - ETR_EVENT_SWITCH_LOCAL, - ETR_EVENT_UPDATE, -}; - -/* - * Valid bit combinations of the eacr register are (x = don't care): - * e0 e1 dp p0 p1 ea es sl - * 0 0 x 0 0 0 0 0 initial, disabled state - * 0 0 x 0 1 1 0 0 port 1 online - * 0 0 x 1 0 1 0 0 port 0 online - * 0 0 x 1 1 1 0 0 both ports online - * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode - * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode - * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync - * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync - * 0 1 x 1 1 1 0 0 both ports online, port 1 usable - * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync - * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync - * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode - * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode - * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync - * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync - * 1 0 x 1 1 1 0 0 both ports online, port 0 usable - * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync - * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync - * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync - * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync - */ -static struct etr_eacr etr_eacr; -static u64 etr_tolec; /* time of last eacr update */ -static struct etr_aib etr_port0; -static int etr_port0_uptodate; -static struct etr_aib etr_port1; -static int etr_port1_uptodate; -static unsigned long etr_events; -static struct timer_list etr_timer; - -static void etr_timeout(unsigned long dummy); -static void etr_work_fn(struct work_struct *work); -static DEFINE_MUTEX(etr_work_mutex); -static DECLARE_WORK(etr_work, etr_work_fn); - -/* - * Reset ETR attachment. - */ -static void etr_reset(void) -{ - etr_eacr = (struct etr_eacr) { - .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0, - .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0, - .es = 0, .sl = 0 }; - if (etr_setr(&etr_eacr) == 0) { - etr_tolec = get_tod_clock(); - set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags); - if (etr_port0_online && etr_port1_online) - set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); - } else if (etr_port0_online || etr_port1_online) { - pr_warn("The real or virtual hardware system does not provide an ETR interface\n"); - etr_port0_online = etr_port1_online = 0; - } -} - -static int __init etr_init(void) -{ - struct etr_aib aib; - - if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) - return 0; - time_init_wq(); - /* Check if this machine has the steai instruction. */ - if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0) - etr_steai_available = 1; - setup_timer(&etr_timer, etr_timeout, 0UL); - if (etr_port0_online) { - set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); - queue_work(time_sync_wq, &etr_work); - } - if (etr_port1_online) { - set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); - queue_work(time_sync_wq, &etr_work); - } - return 0; -} - -arch_initcall(etr_init); - -/* - * Two sorts of ETR machine checks. The architecture reads: - * "When a machine-check niterruption occurs and if a switch-to-local or - * ETR-sync-check interrupt request is pending but disabled, this pending - * disabled interruption request is indicated and is cleared". - * Which means that we can get etr_switch_to_local events from the machine - * check handler although the interruption condition is disabled. Lovely.. - */ - -/* - * Switch to local machine check. This is called when the last usable - * ETR port goes inactive. After switch to local the clock is not in sync. - */ -int etr_switch_to_local(void) -{ - if (!etr_eacr.sl) - return 0; - disable_sync_clock(NULL); - if (!test_and_set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) { - etr_eacr.es = etr_eacr.sl = 0; - etr_setr(&etr_eacr); - return 1; - } - return 0; -} - -/* - * ETR sync check machine check. This is called when the ETR OTE and the - * local clock OTE are farther apart than the ETR sync check tolerance. - * After a ETR sync check the clock is not in sync. The machine check - * is broadcasted to all cpus at the same time. - */ -int etr_sync_check(void) -{ - if (!etr_eacr.es) - return 0; - disable_sync_clock(NULL); - if (!test_and_set_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) { - etr_eacr.es = 0; - etr_setr(&etr_eacr); - return 1; - } - return 0; -} - -void etr_queue_work(void) -{ - queue_work(time_sync_wq, &etr_work); -} - -/* - * ETR timing alert. There are two causes: - * 1) port state change, check the usability of the port - * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the - * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3) - * or ETR-data word 4 (edf4) has changed. - */ -static void etr_timing_alert(struct etr_irq_parm *intparm) -{ - if (intparm->pc0) - /* ETR port 0 state change. */ - set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); - if (intparm->pc1) - /* ETR port 1 state change. */ - set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); - if (intparm->eai) - /* - * ETR port alert on either port 0, 1 or both. - * Both ports are not up-to-date now. - */ - set_bit(ETR_EVENT_PORT_ALERT, &etr_events); - queue_work(time_sync_wq, &etr_work); -} - -static void etr_timeout(unsigned long dummy) -{ - set_bit(ETR_EVENT_UPDATE, &etr_events); - queue_work(time_sync_wq, &etr_work); -} - -/* - * Check if the etr mode is pss. - */ -static inline int etr_mode_is_pps(struct etr_eacr eacr) -{ - return eacr.es && !eacr.sl; -} - -/* - * Check if the etr mode is etr. - */ -static inline int etr_mode_is_etr(struct etr_eacr eacr) -{ - return eacr.es && eacr.sl; -} - -/* - * Check if the port can be used for TOD synchronization. - * For PPS mode the port has to receive OTEs. For ETR mode - * the port has to receive OTEs, the ETR stepping bit has to - * be zero and the validity bits for data frame 1, 2, and 3 - * have to be 1. - */ -static int etr_port_valid(struct etr_aib *aib, int port) -{ - unsigned int psc; - - /* Check that this port is receiving OTEs. */ - if (aib->tsp == 0) - return 0; - - psc = port ? aib->esw.psc1 : aib->esw.psc0; - if (psc == etr_lpsc_pps_mode) - return 1; - if (psc == etr_lpsc_operational_step) - return !aib->esw.y && aib->slsw.v1 && - aib->slsw.v2 && aib->slsw.v3; - return 0; -} - -/* - * Check if two ports are on the same network. - */ -static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2) -{ - // FIXME: any other fields we have to compare? - return aib1->edf1.net_id == aib2->edf1.net_id; -} - -/* - * Wrapper for etr_stei that converts physical port states - * to logical port states to be consistent with the output - * of stetr (see etr_psc vs. etr_lpsc). - */ -static void etr_steai_cv(struct etr_aib *aib, unsigned int func) -{ - BUG_ON(etr_steai(aib, func) != 0); - /* Convert port state to logical port state. */ - if (aib->esw.psc0 == 1) - aib->esw.psc0 = 2; - else if (aib->esw.psc0 == 0 && aib->esw.p == 0) - aib->esw.psc0 = 1; - if (aib->esw.psc1 == 1) - aib->esw.psc1 = 2; - else if (aib->esw.psc1 == 0 && aib->esw.p == 1) - aib->esw.psc1 = 1; -} - -/* - * Check if the aib a2 is still connected to the same attachment as - * aib a1, the etv values differ by one and a2 is valid. - */ -static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p) -{ - int state_a1, state_a2; - - /* Paranoia check: e0/e1 should better be the same. */ - if (a1->esw.eacr.e0 != a2->esw.eacr.e0 || - a1->esw.eacr.e1 != a2->esw.eacr.e1) - return 0; - - /* Still connected to the same etr ? */ - state_a1 = p ? a1->esw.psc1 : a1->esw.psc0; - state_a2 = p ? a2->esw.psc1 : a2->esw.psc0; - if (state_a1 == etr_lpsc_operational_step) { - if (state_a2 != etr_lpsc_operational_step || - a1->edf1.net_id != a2->edf1.net_id || - a1->edf1.etr_id != a2->edf1.etr_id || - a1->edf1.etr_pn != a2->edf1.etr_pn) - return 0; - } else if (state_a2 != etr_lpsc_pps_mode) - return 0; - - /* The ETV value of a2 needs to be ETV of a1 + 1. */ - if (a1->edf2.etv + 1 != a2->edf2.etv) - return 0; - - if (!etr_port_valid(a2, p)) - return 0; - - return 1; -} - struct clock_sync_data { atomic_t cpus; int in_sync; @@ -748,688 +481,6 @@ static void clock_sync_cpu(struct clock_sync_data *sync) } /* - * Sync the TOD clock using the port referred to by aibp. This port - * has to be enabled and the other port has to be disabled. The - * last eacr update has to be more than 1.6 seconds in the past. - */ -static int etr_sync_clock(void *data) -{ - static int first; - unsigned long long clock, old_clock, clock_delta, delay, delta; - struct clock_sync_data *etr_sync; - struct etr_aib *sync_port, *aib; - int port; - int rc; - - etr_sync = data; - - if (xchg(&first, 1) == 1) { - /* Slave */ - clock_sync_cpu(etr_sync); - return 0; - } - - /* Wait until all other cpus entered the sync function. */ - while (atomic_read(&etr_sync->cpus) != 0) - cpu_relax(); - - port = etr_sync->etr_port; - aib = etr_sync->etr_aib; - sync_port = (port == 0) ? &etr_port0 : &etr_port1; - enable_sync_clock(); - - /* Set clock to next OTE. */ - __ctl_set_bit(14, 21); - __ctl_set_bit(0, 29); - clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32; - old_clock = get_tod_clock(); - if (set_tod_clock(clock) == 0) { - __udelay(1); /* Wait for the clock to start. */ - __ctl_clear_bit(0, 29); - __ctl_clear_bit(14, 21); - etr_stetr(aib); - /* Adjust Linux timing variables. */ - delay = (unsigned long long) - (aib->edf2.etv - sync_port->edf2.etv) << 32; - delta = adjust_time(old_clock, clock, delay); - clock_delta = clock - old_clock; - atomic_notifier_call_chain(&s390_epoch_delta_notifier, 0, - &clock_delta); - etr_sync->fixup_cc = delta; - fixup_clock_comparator(delta); - /* Verify that the clock is properly set. */ - if (!etr_aib_follows(sync_port, aib, port)) { - /* Didn't work. */ - disable_sync_clock(NULL); - etr_sync->in_sync = -EAGAIN; - rc = -EAGAIN; - } else { - etr_sync->in_sync = 1; - rc = 0; - } - } else { - /* Could not set the clock ?!? */ - __ctl_clear_bit(0, 29); - __ctl_clear_bit(14, 21); - disable_sync_clock(NULL); - etr_sync->in_sync = -EAGAIN; - rc = -EAGAIN; - } - xchg(&first, 0); - return rc; -} - -static int etr_sync_clock_stop(struct etr_aib *aib, int port) -{ - struct clock_sync_data etr_sync; - struct etr_aib *sync_port; - int follows; - int rc; - - /* Check if the current aib is adjacent to the sync port aib. */ - sync_port = (port == 0) ? &etr_port0 : &etr_port1; - follows = etr_aib_follows(sync_port, aib, port); - memcpy(sync_port, aib, sizeof(*aib)); - if (!follows) - return -EAGAIN; - memset(&etr_sync, 0, sizeof(etr_sync)); - etr_sync.etr_aib = aib; - etr_sync.etr_port = port; - get_online_cpus(); - atomic_set(&etr_sync.cpus, num_online_cpus() - 1); - rc = stop_machine(etr_sync_clock, &etr_sync, cpu_online_mask); - put_online_cpus(); - return rc; -} - -/* - * Handle the immediate effects of the different events. - * The port change event is used for online/offline changes. - */ -static struct etr_eacr etr_handle_events(struct etr_eacr eacr) -{ - if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) - eacr.es = 0; - if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) - eacr.es = eacr.sl = 0; - if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events)) - etr_port0_uptodate = etr_port1_uptodate = 0; - - if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) { - if (eacr.e0) - /* - * Port change of an enabled port. We have to - * assume that this can have caused an stepping - * port switch. - */ - etr_tolec = get_tod_clock(); - eacr.p0 = etr_port0_online; - if (!eacr.p0) - eacr.e0 = 0; - etr_port0_uptodate = 0; - } - if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) { - if (eacr.e1) - /* - * Port change of an enabled port. We have to - * assume that this can have caused an stepping - * port switch. - */ - etr_tolec = get_tod_clock(); - eacr.p1 = etr_port1_online; - if (!eacr.p1) - eacr.e1 = 0; - etr_port1_uptodate = 0; - } - clear_bit(ETR_EVENT_UPDATE, &etr_events); - return eacr; -} - -/* - * Set up a timer that expires after the etr_tolec + 1.6 seconds if - * one of the ports needs an update. - */ -static void etr_set_tolec_timeout(unsigned long long now) -{ - unsigned long micros; - - if ((!etr_eacr.p0 || etr_port0_uptodate) && - (!etr_eacr.p1 || etr_port1_uptodate)) - return; - micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0; - micros = (micros > 1600000) ? 0 : 1600000 - micros; - mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1); -} - -/* - * Set up a time that expires after 1/2 second. - */ -static void etr_set_sync_timeout(void) -{ - mod_timer(&etr_timer, jiffies + HZ/2); -} - -/* - * Update the aib information for one or both ports. - */ -static struct etr_eacr etr_handle_update(struct etr_aib *aib, - struct etr_eacr eacr) -{ - /* With both ports disabled the aib information is useless. */ - if (!eacr.e0 && !eacr.e1) - return eacr; - - /* Update port0 or port1 with aib stored in etr_work_fn. */ - if (aib->esw.q == 0) { - /* Information for port 0 stored. */ - if (eacr.p0 && !etr_port0_uptodate) { - etr_port0 = *aib; - if (etr_port0_online) - etr_port0_uptodate = 1; - } - } else { - /* Information for port 1 stored. */ - if (eacr.p1 && !etr_port1_uptodate) { - etr_port1 = *aib; - if (etr_port0_online) - etr_port1_uptodate = 1; - } - } - - /* - * Do not try to get the alternate port aib if the clock - * is not in sync yet. - */ - if (!eacr.es || !check_sync_clock()) - return eacr; - - /* - * If steai is available we can get the information about - * the other port immediately. If only stetr is available the - * data-port bit toggle has to be used. - */ - if (etr_steai_available) { - if (eacr.p0 && !etr_port0_uptodate) { - etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0); - etr_port0_uptodate = 1; - } - if (eacr.p1 && !etr_port1_uptodate) { - etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1); - etr_port1_uptodate = 1; - } - } else { - /* - * One port was updated above, if the other - * port is not uptodate toggle dp bit. - */ - if ((eacr.p0 && !etr_port0_uptodate) || - (eacr.p1 && !etr_port1_uptodate)) - eacr.dp ^= 1; - else - eacr.dp = 0; - } - return eacr; -} - -/* - * Write new etr control register if it differs from the current one. - * Return 1 if etr_tolec has been updated as well. - */ -static void etr_update_eacr(struct etr_eacr eacr) -{ - int dp_changed; - - if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0) - /* No change, return. */ - return; - /* - * The disable of an active port of the change of the data port - * bit can/will cause a change in the data port. - */ - dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 || - (etr_eacr.dp ^ eacr.dp) != 0; - etr_eacr = eacr; - etr_setr(&etr_eacr); - if (dp_changed) - etr_tolec = get_tod_clock(); -} - -/* - * ETR work. In this function you'll find the main logic. In - * particular this is the only function that calls etr_update_eacr(), - * it "controls" the etr control register. - */ -static void etr_work_fn(struct work_struct *work) -{ - unsigned long long now; - struct etr_eacr eacr; - struct etr_aib aib; - int sync_port; - - /* prevent multiple execution. */ - mutex_lock(&etr_work_mutex); - - /* Create working copy of etr_eacr. */ - eacr = etr_eacr; - - /* Check for the different events and their immediate effects. */ - eacr = etr_handle_events(eacr); - - /* Check if ETR is supposed to be active. */ - eacr.ea = eacr.p0 || eacr.p1; - if (!eacr.ea) { - /* Both ports offline. Reset everything. */ - eacr.dp = eacr.es = eacr.sl = 0; - on_each_cpu(disable_sync_clock, NULL, 1); - del_timer_sync(&etr_timer); - etr_update_eacr(eacr); - goto out_unlock; - } - - /* Store aib to get the current ETR status word. */ - BUG_ON(etr_stetr(&aib) != 0); - etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */ - now = get_tod_clock(); - - /* - * Update the port information if the last stepping port change - * or data port change is older than 1.6 seconds. - */ - if (now >= etr_tolec + (1600000 << 12)) - eacr = etr_handle_update(&aib, eacr); - - /* - * Select ports to enable. The preferred synchronization mode is PPS. - * If a port can be enabled depends on a number of things: - * 1) The port needs to be online and uptodate. A port is not - * disabled just because it is not uptodate, but it is only - * enabled if it is uptodate. - * 2) The port needs to have the same mode (pps / etr). - * 3) The port needs to be usable -> etr_port_valid() == 1 - * 4) To enable the second port the clock needs to be in sync. - * 5) If both ports are useable and are ETR ports, the network id - * has to be the same. - * The eacr.sl bit is used to indicate etr mode vs. pps mode. - */ - if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) { - eacr.sl = 0; - eacr.e0 = 1; - if (!etr_mode_is_pps(etr_eacr)) - eacr.es = 0; - if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode) - eacr.e1 = 0; - // FIXME: uptodate checks ? - else if (etr_port0_uptodate && etr_port1_uptodate) - eacr.e1 = 1; - sync_port = (etr_port0_uptodate && - etr_port_valid(&etr_port0, 0)) ? 0 : -1; - } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) { - eacr.sl = 0; - eacr.e0 = 0; - eacr.e1 = 1; - if (!etr_mode_is_pps(etr_eacr)) - eacr.es = 0; - sync_port = (etr_port1_uptodate && - etr_port_valid(&etr_port1, 1)) ? 1 : -1; - } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) { - eacr.sl = 1; - eacr.e0 = 1; - if (!etr_mode_is_etr(etr_eacr)) - eacr.es = 0; - if (!eacr.es || !eacr.p1 || - aib.esw.psc1 != etr_lpsc_operational_alt) - eacr.e1 = 0; - else if (etr_port0_uptodate && etr_port1_uptodate && - etr_compare_network(&etr_port0, &etr_port1)) - eacr.e1 = 1; - sync_port = (etr_port0_uptodate && - etr_port_valid(&etr_port0, 0)) ? 0 : -1; - } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) { - eacr.sl = 1; - eacr.e0 = 0; - eacr.e1 = 1; - if (!etr_mode_is_etr(etr_eacr)) - eacr.es = 0; - sync_port = (etr_port1_uptodate && - etr_port_valid(&etr_port1, 1)) ? 1 : -1; - } else { - /* Both ports not usable. */ - eacr.es = eacr.sl = 0; - sync_port = -1; - } - - /* - * If the clock is in sync just update the eacr and return. - * If there is no valid sync port wait for a port update. - */ - if ((eacr.es && check_sync_clock()) || sync_port < 0) { - etr_update_eacr(eacr); - etr_set_tolec_timeout(now); - goto out_unlock; - } - - /* - * Prepare control register for clock syncing - * (reset data port bit, set sync check control. - */ - eacr.dp = 0; - eacr.es = 1; - - /* - * Update eacr and try to synchronize the clock. If the update - * of eacr caused a stepping port switch (or if we have to - * assume that a stepping port switch has occurred) or the - * clock syncing failed, reset the sync check control bit - * and set up a timer to try again after 0.5 seconds - */ - etr_update_eacr(eacr); - if (now < etr_tolec + (1600000 << 12) || - etr_sync_clock_stop(&aib, sync_port) != 0) { - /* Sync failed. Try again in 1/2 second. */ - eacr.es = 0; - etr_update_eacr(eacr); - etr_set_sync_timeout(); - } else - etr_set_tolec_timeout(now); -out_unlock: - mutex_unlock(&etr_work_mutex); -} - -/* - * Sysfs interface functions - */ -static struct bus_type etr_subsys = { - .name = "etr", - .dev_name = "etr", -}; - -static struct device etr_port0_dev = { - .id = 0, - .bus = &etr_subsys, -}; - -static struct device etr_port1_dev = { - .id = 1, - .bus = &etr_subsys, -}; - -/* - * ETR subsys attributes - */ -static ssize_t etr_stepping_port_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - return sprintf(buf, "%i\n", etr_port0.esw.p); -} - -static DEVICE_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL); - -static ssize_t etr_stepping_mode_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - char *mode_str; - - if (etr_mode_is_pps(etr_eacr)) - mode_str = "pps"; - else if (etr_mode_is_etr(etr_eacr)) - mode_str = "etr"; - else - mode_str = "local"; - return sprintf(buf, "%s\n", mode_str); -} - -static DEVICE_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL); - -/* - * ETR port attributes - */ -static inline struct etr_aib *etr_aib_from_dev(struct device *dev) -{ - if (dev == &etr_port0_dev) - return etr_port0_online ? &etr_port0 : NULL; - else - return etr_port1_online ? &etr_port1 : NULL; -} - -static ssize_t etr_online_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - unsigned int online; - - online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online; - return sprintf(buf, "%i\n", online); -} - -static ssize_t etr_online_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - unsigned int value; - - value = simple_strtoul(buf, NULL, 0); - if (value != 0 && value != 1) - return -EINVAL; - if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags)) - return -EOPNOTSUPP; - mutex_lock(&clock_sync_mutex); - if (dev == &etr_port0_dev) { - if (etr_port0_online == value) - goto out; /* Nothing to do. */ - etr_port0_online = value; - if (etr_port0_online && etr_port1_online) - set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); - else - clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); - set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events); - queue_work(time_sync_wq, &etr_work); - } else { - if (etr_port1_online == value) - goto out; /* Nothing to do. */ - etr_port1_online = value; - if (etr_port0_online && etr_port1_online) - set_bit(CLOCK_SYNC_ETR, &clock_sync_flags); - else - clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags); - set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events); - queue_work(time_sync_wq, &etr_work); - } -out: - mutex_unlock(&clock_sync_mutex); - return count; -} - -static DEVICE_ATTR(online, 0600, etr_online_show, etr_online_store); - -static ssize_t etr_stepping_control_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? - etr_eacr.e0 : etr_eacr.e1); -} - -static DEVICE_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL); - -static ssize_t etr_mode_code_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - if (!etr_port0_online && !etr_port1_online) - /* Status word is not uptodate if both ports are offline. */ - return -ENODATA; - return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ? - etr_port0.esw.psc0 : etr_port0.esw.psc1); -} - -static DEVICE_ATTR(state_code, 0400, etr_mode_code_show, NULL); - -static ssize_t etr_untuned_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct etr_aib *aib = etr_aib_from_dev(dev); - - if (!aib || !aib->slsw.v1) - return -ENODATA; - return sprintf(buf, "%i\n", aib->edf1.u); -} - -static DEVICE_ATTR(untuned, 0400, etr_untuned_show, NULL); - -static ssize_t etr_network_id_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct etr_aib *aib = etr_aib_from_dev(dev); - - if (!aib || !aib->slsw.v1) - return -ENODATA; - return sprintf(buf, "%i\n", aib->edf1.net_id); -} - -static DEVICE_ATTR(network, 0400, etr_network_id_show, NULL); - -static ssize_t etr_id_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct etr_aib *aib = etr_aib_from_dev(dev); - - if (!aib || !aib->slsw.v1) - return -ENODATA; - return sprintf(buf, "%i\n", aib->edf1.etr_id); -} - -static DEVICE_ATTR(id, 0400, etr_id_show, NULL); - -static ssize_t etr_port_number_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct etr_aib *aib = etr_aib_from_dev(dev); - - if (!aib || !aib->slsw.v1) - return -ENODATA; - return sprintf(buf, "%i\n", aib->edf1.etr_pn); -} - -static DEVICE_ATTR(port, 0400, etr_port_number_show, NULL); - -static ssize_t etr_coupled_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct etr_aib *aib = etr_aib_from_dev(dev); - - if (!aib || !aib->slsw.v3) - return -ENODATA; - return sprintf(buf, "%i\n", aib->edf3.c); -} - -static DEVICE_ATTR(coupled, 0400, etr_coupled_show, NULL); - -static ssize_t etr_local_time_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct etr_aib *aib = etr_aib_from_dev(dev); - - if (!aib || !aib->slsw.v3) - return -ENODATA; - return sprintf(buf, "%i\n", aib->edf3.blto); -} - -static DEVICE_ATTR(local_time, 0400, etr_local_time_show, NULL); - -static ssize_t etr_utc_offset_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct etr_aib *aib = etr_aib_from_dev(dev); - - if (!aib || !aib->slsw.v3) - return -ENODATA; - return sprintf(buf, "%i\n", aib->edf3.buo); -} - -static DEVICE_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL); - -static struct device_attribute *etr_port_attributes[] = { - &dev_attr_online, - &dev_attr_stepping_control, - &dev_attr_state_code, - &dev_attr_untuned, - &dev_attr_network, - &dev_attr_id, - &dev_attr_port, - &dev_attr_coupled, - &dev_attr_local_time, - &dev_attr_utc_offset, - NULL -}; - -static int __init etr_register_port(struct device *dev) -{ - struct device_attribute **attr; - int rc; - - rc = device_register(dev); - if (rc) - goto out; - for (attr = etr_port_attributes; *attr; attr++) { - rc = device_create_file(dev, *attr); - if (rc) - goto out_unreg; - } - return 0; -out_unreg: - for (; attr >= etr_port_attributes; attr--) - device_remove_file(dev, *attr); - device_unregister(dev); -out: - return rc; -} - -static void __init etr_unregister_port(struct device *dev) -{ - struct device_attribute **attr; - - for (attr = etr_port_attributes; *attr; attr++) - device_remove_file(dev, *attr); - device_unregister(dev); -} - -static int __init etr_init_sysfs(void) -{ - int rc; - - rc = subsys_system_register(&etr_subsys, NULL); - if (rc) - goto out; - rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_port); - if (rc) - goto out_unreg_subsys; - rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_mode); - if (rc) - goto out_remove_stepping_port; - rc = etr_register_port(&etr_port0_dev); - if (rc) - goto out_remove_stepping_mode; - rc = etr_register_port(&etr_port1_dev); - if (rc) - goto out_remove_port0; - return 0; - -out_remove_port0: - etr_unregister_port(&etr_port0_dev); -out_remove_stepping_mode: - device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_mode); -out_remove_stepping_port: - device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_port); -out_unreg_subsys: - bus_unregister(&etr_subsys); -out: - return rc; -} - -device_initcall(etr_init_sysfs); - -/* * Server Time Protocol (STP) code. */ static bool stp_online; @@ -1455,7 +506,7 @@ static void __init stp_reset(void) int rc; stp_page = (void *) get_zeroed_page(GFP_ATOMIC); - rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); + rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000, NULL); if (rc == 0) set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags); else if (stp_online) { @@ -1533,6 +584,7 @@ static int stp_sync_clock(void *data) static int first; unsigned long long old_clock, delta, new_clock, clock_delta; struct clock_sync_data *stp_sync; + struct ptff_qto qto; int rc; stp_sync = data; @@ -1554,11 +606,14 @@ static int stp_sync_clock(void *data) stp_info.todoff[2] || stp_info.todoff[3] || stp_info.tmd != 2) { old_clock = get_tod_clock(); - rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0); + rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0, &clock_delta); if (rc == 0) { - new_clock = get_tod_clock(); + new_clock = old_clock + clock_delta; delta = adjust_time(old_clock, new_clock, 0); - clock_delta = new_clock - old_clock; + if (ptff_query(PTFF_QTO) && + ptff(&qto, sizeof(qto), PTFF_QTO) == 0) + /* Update LPAR offset */ + lpar_offset = qto.tod_epoch_difference; atomic_notifier_call_chain(&s390_epoch_delta_notifier, 0, &clock_delta); fixup_clock_comparator(delta); @@ -1590,12 +645,12 @@ static void stp_work_fn(struct work_struct *work) mutex_lock(&stp_work_mutex); if (!stp_online) { - chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); + chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000, NULL); del_timer_sync(&stp_timer); goto out_unlock; } - rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0); + rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0, NULL); if (rc) goto out_unlock; |