#include <asm/bitops.h>
#include <asm/atomic.h>
#include <asm/traps.h>
+#include <asm/bitsperlong.h>
-#define IPIPE_ARCH_STRING "1.12-00"
+#define IPIPE_ARCH_STRING "1.16-01"
#define IPIPE_MAJOR_NUMBER 1
-#define IPIPE_MINOR_NUMBER 12
-#define IPIPE_PATCH_NUMBER 0
+#define IPIPE_MINOR_NUMBER 16
+#define IPIPE_PATCH_NUMBER 1
#ifdef CONFIG_SMP
#error "I-pipe/blackfin: SMP not implemented"
#define task_hijacked(p) \
({ \
int __x__ = __ipipe_root_domain_p; \
- __clear_bit(IPIPE_SYNC_FLAG, &ipipe_root_cpudom_var(status)); \
if (__x__) \
- hard_local_irq_enable(); \
+ hard_local_irq_enable(); \
!__x__; \
})
struct ipipe_domain;
struct ipipe_sysinfo {
-
- int ncpus; /* Number of CPUs on board */
- u64 cpufreq; /* CPU frequency (in Hz) */
-
- /* Arch-dependent block */
-
- struct {
- unsigned tmirq; /* Timer tick IRQ */
- u64 tmfreq; /* Timer frequency */
- } archdep;
+ int sys_nr_cpus; /* Number of CPUs on board */
+ int sys_hrtimer_irq; /* hrtimer device IRQ */
+ u64 sys_hrtimer_freq; /* hrtimer device frequency */
+ u64 sys_hrclock_freq; /* hrclock device frequency */
+ u64 sys_cpu_freq; /* CPU frequency (Hz) */
};
#define ipipe_read_tsc(t) \
void __ipipe_disable_irqdesc(struct ipipe_domain *ipd,
unsigned irq);
-#define __ipipe_enable_irq(irq) (irq_desc[irq].chip->unmask(irq))
+#define __ipipe_enable_irq(irq) \
+ do { \
+ struct irq_desc *desc = irq_to_desc(irq); \
+ struct irq_chip *chip = get_irq_desc_chip(desc); \
+ chip->irq_unmask(&desc->irq_data); \
+ } while (0)
-#define __ipipe_disable_irq(irq) (irq_desc[irq].chip->mask(irq))
+#define __ipipe_disable_irq(irq) \
+ do { \
+ struct irq_desc *desc = irq_to_desc(irq); \
+ struct irq_chip *chip = get_irq_desc_chip(desc); \
+ chip->irq_mask(&desc->irq_data); \
+ } while (0)
static inline int __ipipe_check_tickdev(const char *devname)
{
#define __ipipe_hook_critical_ipi(ipd) do { } while (0)
-#define __ipipe_sync_pipeline ___ipipe_sync_pipeline
-void ___ipipe_sync_pipeline(unsigned long syncmask);
+void ___ipipe_sync_pipeline(void);
void __ipipe_handle_irq(unsigned irq, struct pt_regs *regs);
-int __ipipe_get_irq_priority(unsigned irq);
+int __ipipe_get_irq_priority(unsigned int irq);
void __ipipe_serial_debug(const char *fmt, ...);
return ffs(ul) - 1;
}
-#define __ipipe_run_irqtail() /* Must be a macro */ \
+#define __ipipe_do_root_xirq(ipd, irq) \
+ ((ipd)->irqs[irq].handler(irq, &__raw_get_cpu_var(__ipipe_tick_regs)))
+
+#define __ipipe_run_irqtail(irq) /* Must be a macro */ \
do { \
unsigned long __pending; \
CSYNC(); \
} \
} while (0)
-#define __ipipe_run_isr(ipd, irq) \
- do { \
- if (!__ipipe_pipeline_head_p(ipd)) \
- hard_local_irq_enable(); \
- if (ipd == ipipe_root_domain) { \
- if (unlikely(ipipe_virtual_irq_p(irq))) { \
- irq_enter(); \
- ipd->irqs[irq].handler(irq, ipd->irqs[irq].cookie); \
- irq_exit(); \
- } else \
- ipd->irqs[irq].handler(irq, &__raw_get_cpu_var(__ipipe_tick_regs)); \
- } else { \
- __clear_bit(IPIPE_SYNC_FLAG, &ipipe_cpudom_var(ipd, status)); \
- ipd->irqs[irq].handler(irq, ipd->irqs[irq].cookie); \
- /* Attempt to exit the outer interrupt level before \
- * starting the deferred IRQ processing. */ \
- __ipipe_run_irqtail(); \
- __set_bit(IPIPE_SYNC_FLAG, &ipipe_cpudom_var(ipd, status)); \
- } \
- hard_local_irq_disable(); \
- } while (0)
-
#define __ipipe_syscall_watched_p(p, sc) \
- (((p)->flags & PF_EVNOTIFY) || (unsigned long)sc >= NR_syscalls)
-
-void ipipe_init_irq_threads(void);
-
-int ipipe_start_irq_thread(unsigned irq, struct irq_desc *desc);
-
-#ifdef CONFIG_TICKSOURCE_CORETMR
-#define IRQ_SYSTMR IRQ_CORETMR
-#define IRQ_PRIOTMR IRQ_CORETMR
-#else
-#define IRQ_SYSTMR IRQ_TIMER0
-#define IRQ_PRIOTMR CONFIG_IRQ_TIMER0
-#endif
+ (ipipe_notifier_enabled_p(p) || (unsigned long)sc >= NR_syscalls)
#ifdef CONFIG_BF561
#define bfin_write_TIMER_DISABLE(val) bfin_write_TMRS8_DISABLE(val)
#define task_hijacked(p) 0
#define ipipe_trap_notify(t, r) 0
+#define __ipipe_root_tick_p(regs) 1
-#define ipipe_init_irq_threads() do { } while (0)
-#define ipipe_start_irq_thread(irq, desc) 0
+#endif /* !CONFIG_IPIPE */
-#ifndef CONFIG_TICKSOURCE_GPTMR0
+#ifdef CONFIG_TICKSOURCE_CORETMR
#define IRQ_SYSTMR IRQ_CORETMR
#define IRQ_PRIOTMR IRQ_CORETMR
#else
#define IRQ_PRIOTMR CONFIG_IRQ_TIMER0
#endif
-#define __ipipe_root_tick_p(regs) 1
-
-#endif /* !CONFIG_IPIPE */
-
#define ipipe_update_tick_evtdev(evtdev) do { } while (0)
#endif /* !__ASM_BLACKFIN_IPIPE_H */
#ifdef CONFIG_IPIPE
+#include <asm/bitsperlong.h>
+#include <mach/irq.h>
+
#define IPIPE_NR_XIRQS NR_IRQS
-#define IPIPE_IRQ_ISHIFT 5 /* 2^5 for 32bits arch. */
/* Blackfin-specific, per-cpu pipeline status */
#define IPIPE_SYNCDEFER_FLAG 15
#define IPIPE_EVENT_INIT (IPIPE_FIRST_EVENT + 4)
#define IPIPE_EVENT_EXIT (IPIPE_FIRST_EVENT + 5)
#define IPIPE_EVENT_CLEANUP (IPIPE_FIRST_EVENT + 6)
-#define IPIPE_LAST_EVENT IPIPE_EVENT_CLEANUP
+#define IPIPE_EVENT_RETURN (IPIPE_FIRST_EVENT + 7)
+#define IPIPE_LAST_EVENT IPIPE_EVENT_RETURN
#define IPIPE_NR_EVENTS (IPIPE_LAST_EVENT + 1)
#define IPIPE_TIMER_IRQ IRQ_CORETMR
+#define __IPIPE_FEATURE_SYSINFO_V2 1
+
#ifndef __ASSEMBLY__
extern unsigned long __ipipe_root_status; /* Alias to ipipe_root_cpudom_var(status) */
#endif /* !__ASSEMBLY__ */
+#define __IPIPE_FEATURE_SYSINFO_V2 1
+
#endif /* CONFIG_IPIPE */
#endif /* !__ASM_BLACKFIN_IPIPE_BASE_H */
* 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);
}
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:
* 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;
}
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());
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)
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
+#include <linux/sched.h>
#ifdef CONFIG_IPIPE
#include <linux/ipipe.h>
#endif
static inline void bfin_set_irq_handler(unsigned irq, irq_flow_handler_t handle)
{
#ifdef CONFIG_IPIPE
- _set_irq_handler(irq, handle_level_irq);
-#else
- __set_irq_handler_unlocked(irq, handle);
+ handle = handle_level_irq;
#endif
+ __set_irq_handler_unlocked(irq, handle);
}
static DECLARE_BITMAP(gpio_enabled, MAX_BLACKFIN_GPIOS);
struct ipipe_domain *this_domain = __ipipe_current_domain;
struct ivgx *ivg_stop = ivg7_13[vec-IVG7].istop;
struct ivgx *ivg = ivg7_13[vec-IVG7].ifirst;
- int irq, s;
+ int irq, s = 0;
if (likely(vec == EVT_IVTMR_P))
irq = IRQ_CORETMR;
__raw_get_cpu_var(__ipipe_tick_regs).ipend |= 0x10;
}
+ /*
+ * We don't want Linux interrupt handlers to run at the
+ * current core priority level (i.e. < EVT15), since this
+ * might delay other interrupts handled by a high priority
+ * domain. Here is what we do instead:
+ *
+ * - we raise the SYNCDEFER bit to prevent
+ * __ipipe_handle_irq() to sync the pipeline for the root
+ * stage for the incoming interrupt. Upon return, that IRQ is
+ * pending in the interrupt log.
+ *
+ * - we raise the TIF_IRQ_SYNC bit for the current thread, so
+ * that _schedule_and_signal_from_int will eventually sync the
+ * pipeline from EVT15.
+ */
if (this_domain == ipipe_root_domain) {
s = __test_and_set_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
barrier();
__ipipe_handle_irq(irq, regs);
ipipe_trace_irq_exit(irq);
+ if (user_mode(regs) &&
+ !ipipe_test_foreign_stack() &&
+ (current->ipipe_flags & PF_EVTRET) != 0) {
+ /*
+ * Testing for user_regs() does NOT fully eliminate
+ * foreign stack contexts, because of the forged
+ * interrupt returns we do through
+ * __ipipe_call_irqtail. In that case, we might have
+ * preempted a foreign stack context in a high
+ * priority domain, with a single interrupt level now
+ * pending after the irqtail unwinding is done. In
+ * which case user_mode() is now true, and the event
+ * gets dispatched spuriously.
+ */
+ current->ipipe_flags &= ~PF_EVTRET;
+ __ipipe_dispatch_event(IPIPE_EVENT_RETURN, regs);
+ }
+
if (this_domain == ipipe_root_domain) {
set_thread_flag(TIF_IRQ_SYNC);
if (!s) {
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