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authorPhilippe Gerum <rpm@xenomai.org>2011-03-17 02:12:48 -0400
committerMike Frysinger <vapier@gentoo.org>2011-03-18 04:01:10 -0400
commit5b5da4c4b843e0d84244472b72fe1e7500f5681f (patch)
treeb15424c4909ca7b4f69f28bd8576ba065e9030fa /arch/blackfin/kernel
parent8944b5a258d73abd1f86bb360c27bb8c3bed5daa (diff)
Blackfin/ipipe: upgrade to I-pipe mainline
This patch introduces Blackfin-specific bits to support the current tip of the interrupt pipeline development, mainly: - 2/3-level interrupt maps (sparse IRQs) - generic virq handling - sysinfo v2 format for ipipe_get_sysinfo() Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/kernel')
-rw-r--r--arch/blackfin/kernel/ipipe.c84
1 files changed, 39 insertions, 45 deletions
diff --git a/arch/blackfin/kernel/ipipe.c b/arch/blackfin/kernel/ipipe.c
index 3b1da4aff2a1..f37019c847c9 100644
--- a/arch/blackfin/kernel/ipipe.c
+++ b/arch/blackfin/kernel/ipipe.c
@@ -154,7 +154,7 @@ void __ipipe_handle_irq(unsigned irq, struct pt_regs *regs)
* pending for it.
*/
if (test_bit(IPIPE_AHEAD_FLAG, &this_domain->flags) &&
- ipipe_head_cpudom_var(irqpend_himask) == 0)
+ !__ipipe_ipending_p(ipipe_head_cpudom_ptr()))
goto out;
__ipipe_walk_pipeline(head);
@@ -185,25 +185,21 @@ void __ipipe_disable_irqdesc(struct ipipe_domain *ipd, unsigned irq)
}
EXPORT_SYMBOL(__ipipe_disable_irqdesc);
-int __ipipe_syscall_root(struct pt_regs *regs)
+asmlinkage int __ipipe_syscall_root(struct pt_regs *regs)
{
struct ipipe_percpu_domain_data *p;
- unsigned long flags;
+ void (*hook)(void);
int ret;
+ WARN_ON_ONCE(irqs_disabled_hw());
+
/*
- * We need to run the IRQ tail hook whenever we don't
- * propagate a syscall to higher domains, because we know that
- * important operations might be pending there (e.g. Xenomai
- * deferred rescheduling).
+ * We need to run the IRQ tail hook each time we intercept a
+ * syscall, because we know that important operations might be
+ * pending there (e.g. Xenomai deferred rescheduling).
*/
-
- if (regs->orig_p0 < NR_syscalls) {
- void (*hook)(void) = (void (*)(void))__ipipe_irq_tail_hook;
- hook();
- if ((current->flags & PF_EVNOTIFY) == 0)
- return 0;
- }
+ hook = (__typeof__(hook))__ipipe_irq_tail_hook;
+ hook();
/*
* This routine either returns:
@@ -214,51 +210,47 @@ int __ipipe_syscall_root(struct pt_regs *regs)
* tail work has to be performed (for handling signals etc).
*/
- if (!__ipipe_event_monitored_p(IPIPE_EVENT_SYSCALL))
+ if (!__ipipe_syscall_watched_p(current, regs->orig_p0) ||
+ !__ipipe_event_monitored_p(IPIPE_EVENT_SYSCALL))
return 0;
ret = __ipipe_dispatch_event(IPIPE_EVENT_SYSCALL, regs);
- flags = hard_local_irq_save();
+ hard_local_irq_disable();
- if (!__ipipe_root_domain_p) {
- hard_local_irq_restore(flags);
- return 1;
+ /*
+ * This is the end of the syscall path, so we may
+ * safely assume a valid Linux task stack here.
+ */
+ if (current->ipipe_flags & PF_EVTRET) {
+ current->ipipe_flags &= ~PF_EVTRET;
+ __ipipe_dispatch_event(IPIPE_EVENT_RETURN, regs);
}
- p = ipipe_root_cpudom_ptr();
- if ((p->irqpend_himask & IPIPE_IRQMASK_VIRT) != 0)
- __ipipe_sync_pipeline(IPIPE_IRQMASK_VIRT);
+ if (!__ipipe_root_domain_p)
+ ret = -1;
+ else {
+ p = ipipe_root_cpudom_ptr();
+ if (__ipipe_ipending_p(p))
+ __ipipe_sync_pipeline();
+ }
- hard_local_irq_restore(flags);
+ hard_local_irq_enable();
return -ret;
}
-unsigned long ipipe_critical_enter(void (*syncfn) (void))
-{
- unsigned long flags;
-
- flags = hard_local_irq_save();
-
- return flags;
-}
-
-void ipipe_critical_exit(unsigned long flags)
-{
- hard_local_irq_restore(flags);
-}
-
static void __ipipe_no_irqtail(void)
{
}
int ipipe_get_sysinfo(struct ipipe_sysinfo *info)
{
- info->ncpus = num_online_cpus();
- info->cpufreq = ipipe_cpu_freq();
- info->archdep.tmirq = IPIPE_TIMER_IRQ;
- info->archdep.tmfreq = info->cpufreq;
+ info->sys_nr_cpus = num_online_cpus();
+ info->sys_cpu_freq = ipipe_cpu_freq();
+ info->sys_hrtimer_irq = IPIPE_TIMER_IRQ;
+ info->sys_hrtimer_freq = __ipipe_core_clock;
+ info->sys_hrclock_freq = __ipipe_core_clock;
return 0;
}
@@ -289,6 +281,7 @@ int ipipe_trigger_irq(unsigned irq)
asmlinkage void __ipipe_sync_root(void)
{
void (*irq_tail_hook)(void) = (void (*)(void))__ipipe_irq_tail_hook;
+ struct ipipe_percpu_domain_data *p;
unsigned long flags;
BUG_ON(irqs_disabled());
@@ -300,19 +293,20 @@ asmlinkage void __ipipe_sync_root(void)
clear_thread_flag(TIF_IRQ_SYNC);
- if (ipipe_root_cpudom_var(irqpend_himask) != 0)
- __ipipe_sync_pipeline(IPIPE_IRQMASK_ANY);
+ p = ipipe_root_cpudom_ptr();
+ if (__ipipe_ipending_p(p))
+ __ipipe_sync_pipeline();
hard_local_irq_restore(flags);
}
-void ___ipipe_sync_pipeline(unsigned long syncmask)
+void ___ipipe_sync_pipeline(void)
{
if (__ipipe_root_domain_p &&
test_bit(IPIPE_SYNCDEFER_FLAG, &ipipe_root_cpudom_var(status)))
return;
- __ipipe_sync_stage(syncmask);
+ __ipipe_sync_stage();
}
void __ipipe_disable_root_irqs_hw(void)