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Subject[RFC PATCH 14/33] subarch support for controlling interrupt delivery
Abstract the code that controls interrupt delivery, and add a separate
subarch implementation for Xen that manipulates a shared-memory event
delivery mask.

Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

---
arch/i386/mach-xen/Makefile | 2
arch/i386/mach-xen/interrupt.c | 67 +++++++++++++++++++++++++
include/asm-i386/irqflags.h | 61 +---------------------
include/asm-i386/mach-default/mach_irqflags.h | 64 +++++++++++++++++++++++
include/asm-i386/mach-default/mach_system.h | 4 +
include/asm-i386/mach-xen/mach_irqflags.h | 29 ++++++++++
include/asm-i386/mach-xen/mach_system.h | 5 +
7 files changed, 174 insertions(+), 58 deletions(-)


diff -r 092b7e56c85d arch/i386/mach-xen/Makefile
--- a/arch/i386/mach-xen/Makefile Thu Jul 13 14:42:42 2006 -0700
+++ b/arch/i386/mach-xen/Makefile Thu Jul 13 14:42:42 2006 -0700
@@ -4,6 +4,6 @@

extra-y := head.o

-obj-y := setup.o setup-xen.o memory.o
+obj-y := setup.o setup-xen.o memory.o interrupt.o

setup-y := ../mach-default/setup.o
diff -r 092b7e56c85d include/asm-i386/irqflags.h
--- a/include/asm-i386/irqflags.h Thu Jul 13 14:42:42 2006 -0700
+++ b/include/asm-i386/irqflags.h Thu Jul 13 14:42:42 2006 -0700
@@ -10,66 +10,12 @@
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H

+#include <mach_irqflags.h>
+
#ifndef __ASSEMBLY__
-
-static inline unsigned long __raw_local_save_flags(void)
-{
- unsigned long flags;
-
- __asm__ __volatile__(
- "pushfl ; popl %0"
- : "=g" (flags)
- : /* no input */
- );
-
- return flags;
-}

#define raw_local_save_flags(flags) \
do { (flags) = __raw_local_save_flags(); } while (0)
-
-static inline void raw_local_irq_restore(unsigned long flags)
-{
- __asm__ __volatile__(
- "pushl %0 ; popfl"
- : /* no output */
- :"g" (flags)
- :"memory", "cc"
- );
-}
-
-static inline void raw_local_irq_disable(void)
-{
- __asm__ __volatile__("cli" : : : "memory");
-}
-
-static inline void raw_local_irq_enable(void)
-{
- __asm__ __volatile__("sti" : : : "memory");
-}
-
-/*
- * Used in the idle loop; sti takes one instruction cycle
- * to complete:
- */
-static inline void raw_safe_halt(void)
-{
- __asm__ __volatile__("sti; hlt" : : : "memory");
-}
-
-/*
- * Used when interrupts are already enabled or to
- * shutdown the processor:
- */
-static inline void halt(void)
-{
- __asm__ __volatile__("hlt": : :"memory");
-}
-
-static inline int raw_irqs_disabled_flags(unsigned long flags)
-{
- return !(flags & (1 << 9));
-}

static inline int raw_irqs_disabled(void)
{
@@ -93,7 +39,7 @@ static inline unsigned long __raw_local_
#define raw_local_irq_save(flags) \
do { (flags) = __raw_local_irq_save(); } while (0)

-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLY__ */

/*
* Do the CPU's IRQ-state tracing from assembly code. We call a
@@ -124,4 +70,5 @@ static inline unsigned long __raw_local_
# define TRACE_IRQS_OFF
#endif

+
#endif
diff -r 092b7e56c85d arch/i386/mach-xen/interrupt.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/arch/i386/mach-xen/interrupt.c Thu Jul 13 16:00:43 2006 -0700
@@ -0,0 +1,67 @@
+#include <linux/preempt.h>
+#include <linux/module.h>
+
+#include <asm/hypervisor.h>
+#include <mach_irqflags.h>
+
+
+/*
+ * The use of 'barrier' in the following reflects their use as local-lock
+ * operations. Reentrancy must be prevented (e.g., __cli()) /before/ following
+ * critical operations are executed. All critical operations must complete
+ * /before/ reentrancy is permitted (e.g., __sti()).
+ */
+unsigned long __raw_local_save_flags(void)
+{
+ struct vcpu_info *_vcpu;
+ unsigned long flags;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ flags = _vcpu->evtchn_upcall_mask;
+ preempt_enable();
+
+ return flags;
+}
+EXPORT_SYMBOL(__raw_local_save_flags);
+
+void raw_local_irq_restore(unsigned long flags)
+{
+ struct vcpu_info *_vcpu;
+
+ preempt_disable();
+
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ if ((_vcpu->evtchn_upcall_mask = flags) == 0) {
+ barrier(); /* unmask then check (avoid races) */
+ if (unlikely(_vcpu->evtchn_upcall_pending))
+ force_evtchn_callback();
+ preempt_enable();
+ } else
+ preempt_enable_no_resched();
+}
+EXPORT_SYMBOL(raw_local_irq_restore);
+
+void raw_local_irq_disable(void)
+{
+ struct vcpu_info *_vcpu;
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ _vcpu->evtchn_upcall_mask = 1;
+ preempt_enable_no_resched();
+}
+EXPORT_SYMBOL(raw_local_irq_disable);
+
+void raw_local_irq_enable(void)
+{
+ struct vcpu_info *_vcpu;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ _vcpu->evtchn_upcall_mask = 0;
+ barrier(); /* unmask then check (avoid races) */
+ if (unlikely(_vcpu->evtchn_upcall_pending))
+ force_evtchn_callback();
+ preempt_enable();
+}
+EXPORT_SYMBOL(raw_local_irq_enable);
diff -r 092b7e56c85d include/asm-i386/mach-default/mach_irqflags.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/asm-i386/mach-default/mach_irqflags.h Thu Jul 13 14:42:42 2006 -0700
@@ -0,0 +1,64 @@
+#ifndef ASM_MACH_IRQFLAGS_H
+#define ASM_MACH_IRQFLAGS_H
+
+#ifndef __ASSEMBLY__
+
+static inline unsigned long __raw_local_save_flags(void)
+{
+ unsigned long flags;
+
+ __asm__ __volatile__(
+ "pushfl ; popl %0"
+ : "=g" (flags)
+ : /* no input */
+ );
+
+ return flags;
+}
+
+static inline void raw_local_irq_restore(unsigned long flags)
+{
+ __asm__ __volatile__(
+ "pushl %0 ; popfl"
+ : /* no output */
+ :"g" (flags)
+ :"memory", "cc"
+ );
+}
+
+static inline void raw_local_irq_disable(void)
+{
+ __asm__ __volatile__("cli" : : : "memory");
+}
+
+static inline void raw_local_irq_enable(void)
+{
+ __asm__ __volatile__("sti" : : : "memory");
+}
+
+/*
+ * Used in the idle loop; sti takes one instruction cycle
+ * to complete:
+ */
+static inline void raw_safe_halt(void)
+{
+ __asm__ __volatile__("sti; hlt" : : : "memory");
+}
+
+/*
+ * Used when interrupts are already enabled or to
+ * shutdown the processor:
+ */
+static inline void halt(void)
+{
+ __asm__ __volatile__("hlt": : :"memory");
+}
+
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+ return !(flags & (1 << 9));
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* ASM_MACH_IRQFLAGS_H */
diff -r 092b7e56c85d include/asm-i386/mach-default/mach_system.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/asm-i386/mach-default/mach_system.h Thu Jul 13 15:59:13 2006 -0700
@@ -0,0 +1,4 @@
+#ifndef __ASM_MACH_SYSTEM_H
+#define __ASM_MACH_SYSTEM_H
+
+#endif /* __ASM_MACH_SYSTEM_H */
diff -r 092b7e56c85d include/asm-i386/mach-xen/mach_irqflags.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/asm-i386/mach-xen/mach_irqflags.h Thu Jul 13 14:42:42 2006 -0700
@@ -0,0 +1,29 @@
+#ifndef ASM_MACH_IRQFLAGS_H
+#define ASM_MACH_IRQFLAGS_H
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_SMP
+#define __vcpu_id smp_processor_id()
+#else
+#define __vcpu_id 0
+#endif
+
+/* interrupt control.. */
+
+unsigned long __raw_local_save_flags(void);
+void raw_local_irq_restore(unsigned long flags);
+void raw_local_irq_disable(void);
+void raw_local_irq_enable(void);
+
+#define raw_safe_halt() do { } while(0)
+#define halt() do { } while(0)
+
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+ return flags != 0;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* ASM_MACH_IRQFLAGS_H */
diff -r 092b7e56c85d include/asm-i386/mach-xen/mach_system.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/include/asm-i386/mach-xen/mach_system.h Thu Jul 13 15:59:13 2006 -0700
@@ -0,0 +1,5 @@
+#ifndef __ASM_MACH_SYSTEM_H
+#define __ASM_MACH_SYSTEM_H
+
+
+#endif /* __ASM_MACH_SYSTEM_H */
--
-
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