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[S390] Switch etr from tasklet to workqueue.
The clock synchronization of the ETR code requires an smp_call_function to synchronize all cpus. Calling smp_call_function from a tasklet is illegal. Replace the tasklet with a job on the global workqueue. ETR work is rare and can be postponed to a be done by a kernel thread. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -280,7 +280,6 @@ static void clock_comparator_interrupt(__u16 code)
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}
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static void etr_reset(void);
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static void etr_init(void);
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static void etr_ext_handler(__u16);
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/*
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@ -355,7 +354,6 @@ void __init time_init(void)
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#ifdef CONFIG_VIRT_TIMER
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vtime_init();
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#endif
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etr_init();
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}
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/*
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@ -426,11 +424,11 @@ static struct etr_aib etr_port1;
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static int etr_port1_uptodate;
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static unsigned long etr_events;
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static struct timer_list etr_timer;
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static struct tasklet_struct etr_tasklet;
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static DEFINE_PER_CPU(atomic_t, etr_sync_word);
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static void etr_timeout(unsigned long dummy);
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static void etr_tasklet_fn(unsigned long dummy);
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static void etr_work_fn(struct work_struct *work);
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static DECLARE_WORK(etr_work, etr_work_fn);
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/*
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* The etr get_clock function. It will write the current clock value
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@ -507,29 +505,31 @@ static void etr_reset(void)
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}
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}
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static void etr_init(void)
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static int __init etr_init(void)
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{
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struct etr_aib aib;
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if (test_bit(ETR_FLAG_ENOSYS, &etr_flags))
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return;
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return 0;
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/* Check if this machine has the steai instruction. */
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if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
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set_bit(ETR_FLAG_STEAI, &etr_flags);
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setup_timer(&etr_timer, etr_timeout, 0UL);
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tasklet_init(&etr_tasklet, etr_tasklet_fn, 0);
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if (!etr_port0_online && !etr_port1_online)
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set_bit(ETR_FLAG_EACCES, &etr_flags);
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if (etr_port0_online) {
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set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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}
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if (etr_port1_online) {
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set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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}
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return 0;
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}
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arch_initcall(etr_init);
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/*
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* Two sorts of ETR machine checks. The architecture reads:
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* "When a machine-check niterruption occurs and if a switch-to-local or
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@ -549,7 +549,7 @@ void etr_switch_to_local(void)
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return;
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etr_disable_sync_clock(NULL);
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set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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}
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/*
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@ -564,7 +564,7 @@ void etr_sync_check(void)
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return;
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etr_disable_sync_clock(NULL);
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set_bit(ETR_EVENT_SYNC_CHECK, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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}
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/*
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@ -591,13 +591,13 @@ static void etr_ext_handler(__u16 code)
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* Both ports are not up-to-date now.
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*/
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set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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}
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static void etr_timeout(unsigned long dummy)
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{
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set_bit(ETR_EVENT_UPDATE, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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}
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/*
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@ -927,7 +927,7 @@ static struct etr_eacr etr_handle_update(struct etr_aib *aib,
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if (!eacr.e0 && !eacr.e1)
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return eacr;
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/* Update port0 or port1 with aib stored in etr_tasklet_fn. */
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/* Update port0 or port1 with aib stored in etr_work_fn. */
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if (aib->esw.q == 0) {
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/* Information for port 0 stored. */
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if (eacr.p0 && !etr_port0_uptodate) {
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@ -1007,7 +1007,7 @@ static void etr_update_eacr(struct etr_eacr eacr)
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* particular this is the only function that calls etr_update_eacr(),
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* it "controls" the etr control register.
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*/
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static void etr_tasklet_fn(unsigned long dummy)
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static void etr_work_fn(struct work_struct *work)
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{
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unsigned long long now;
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struct etr_eacr eacr;
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@ -1220,13 +1220,13 @@ static ssize_t etr_online_store(struct sys_device *dev,
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return count; /* Nothing to do. */
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etr_port0_online = value;
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set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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} else {
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if (etr_port1_online == value)
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return count; /* Nothing to do. */
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etr_port1_online = value;
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set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
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tasklet_hi_schedule(&etr_tasklet);
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schedule_work(&etr_work);
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}
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return count;
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}
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