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authorIsaku Yamahata <yamahata@valinux.co.jp>2008-04-02 10:53:56 -0700
committerIngo Molnar <mingo@elte.hu>2008-04-24 23:57:32 +0200
commite849c3e9e0b786619c451d89ef0c47ac9a28fbc1 (patch)
treebc3500d40095c2f868e2efca4918b73a6b0a1090
parentxen: move events.c to drivers/xen for IA64/Xen support (diff)
downloadlinux-dev-e849c3e9e0b786619c451d89ef0c47ac9a28fbc1.tar.xz
linux-dev-e849c3e9e0b786619c451d89ef0c47ac9a28fbc1.zip
Xen: make events.c portable for ia64/xen support
Remove x86 dependency in drivers/xen/events.c for ia64/xen support introducing include/asm/xen/events.h. Introduce xen_irqs_disabled() to hide regs->flags Introduce xen_do_IRQ() to hide regs->orig_ax. make enum ipi_vector definition arch specific. ia64/xen needs four vectors. Add one rmb() because on ia64 xchg() isn't barrier. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--drivers/xen/events.c13
-rw-r--r--include/asm-x86/xen/events.h22
-rw-r--r--include/xen/events.h8
3 files changed, 30 insertions, 13 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index c50d499b1e6f..2396b4492f70 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -469,7 +469,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
for_each_online_cpu(i) {
struct vcpu_info *v = per_cpu(xen_vcpu, i);
printk("%d: masked=%d pending=%d event_sel %08lx\n ", i,
- (get_irq_regs() && i == cpu) ? !(get_irq_regs()->flags & X86_EFLAGS_IF) : v->evtchn_upcall_mask,
+ (get_irq_regs() && i == cpu) ? xen_irqs_disabled(get_irq_regs()) : v->evtchn_upcall_mask,
v->evtchn_upcall_pending,
v->evtchn_pending_sel);
}
@@ -527,7 +527,10 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
if (__get_cpu_var(nesting_count)++)
goto out;
- /* NB. No need for a barrier here -- XCHG is a barrier on x86. */
+#ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
+ /* Clear master flag /before/ clearing selector flag. */
+ rmb();
+#endif
pending_words = xchg(&vcpu_info->evtchn_pending_sel, 0);
while (pending_words != 0) {
unsigned long pending_bits;
@@ -539,10 +542,8 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
int port = (word_idx * BITS_PER_LONG) + bit_idx;
int irq = evtchn_to_irq[port];
- if (irq != -1) {
- regs->orig_ax = ~irq;
- do_IRQ(regs);
- }
+ if (irq != -1)
+ xen_do_IRQ(irq, regs);
}
}
diff --git a/include/asm-x86/xen/events.h b/include/asm-x86/xen/events.h
new file mode 100644
index 000000000000..596312a7bfc9
--- /dev/null
+++ b/include/asm-x86/xen/events.h
@@ -0,0 +1,22 @@
+#ifndef __XEN_EVENTS_H
+#define __XEN_EVENTS_H
+
+enum ipi_vector {
+ XEN_RESCHEDULE_VECTOR,
+ XEN_CALL_FUNCTION_VECTOR,
+
+ XEN_NR_IPIS,
+};
+
+static inline int xen_irqs_disabled(struct pt_regs *regs)
+{
+ return raw_irqs_disabled_flags(regs->flags);
+}
+
+static inline void xen_do_IRQ(int irq, struct pt_regs *regs)
+{
+ regs->orig_ax = ~irq;
+ do_IRQ(regs);
+}
+
+#endif /* __XEN_EVENTS_H */
diff --git a/include/xen/events.h b/include/xen/events.h
index 2bde54d29be5..d99a3e0df880 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -5,13 +5,7 @@
#include <xen/interface/event_channel.h>
#include <asm/xen/hypercall.h>
-
-enum ipi_vector {
- XEN_RESCHEDULE_VECTOR,
- XEN_CALL_FUNCTION_VECTOR,
-
- XEN_NR_IPIS,
-};
+#include <asm/xen/events.h>
int bind_evtchn_to_irq(unsigned int evtchn);
int bind_evtchn_to_irqhandler(unsigned int evtchn,