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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] evtchn: Clean up pirq/dynirq handling.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1221557945 -3600
# Node ID 0ba49e9e74f9a6ecb5ae6597b5913b255bb6ed7a
# Parent de4d39818577c14de7f687ae3eed5745cc903d10
evtchn: Clean up pirq/dynirq handling.
* Remove dynirq/pirq_to/from_irq() macros. It's clearer to use *_BASE
and NR_* macros directly.
* Avoid and fix confusion between a Linux 'pirq' and a Xen
'pirq'. This is basically done by avoiding the notion of a Linux
'pirq' at all.
* Fix IA64 build.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
drivers/xen/core/evtchn.c | 91 +++++++++++++++---------------
include/asm-i386/mach-xen/irq_vectors.h | 6 -
include/asm-ia64/irq.h | 6 -
include/asm-powerpc/xen/asm/hypervisor.h | 7 --
include/asm-x86_64/mach-xen/irq_vectors.h | 6 -
5 files changed, 46 insertions(+), 70 deletions(-)
diff -r de4d39818577 -r 0ba49e9e74f9 drivers/xen/core/evtchn.c
--- a/drivers/xen/core/evtchn.c Fri Sep 12 10:37:32 2008 +0100
+++ b/drivers/xen/core/evtchn.c Tue Sep 16 10:39:05 2008 +0100
@@ -319,13 +319,11 @@ static int find_unbound_irq(void)
static int find_unbound_irq(void)
{
static int warned;
- int dynirq, irq;
-
- for (dynirq = 0; dynirq < NR_DYNIRQS; dynirq++) {
- irq = dynirq_to_irq(dynirq);
+ int irq;
+
+ for (irq = DYNIRQ_BASE; irq < (DYNIRQ_BASE + NR_DYNIRQS); irq++)
if (irq_bindcount[irq] == 0)
return irq;
- }
if (!warned) {
warned = 1;
@@ -761,9 +759,12 @@ void evtchn_register_pirq(int irq)
irq_info[irq] = mk_irq_info(IRQT_PIRQ, irq, 0);
}
-#ifndef CONFIG_X86_IO_APIC
-#undef IO_APIC_IRQ
-#define IO_APIC_IRQ(irq) ((irq) >= pirq_to_irq(16))
+#if defined(CONFIG_X86_IO_APIC)
+#define identity_mapped_irq(irq) (!IO_APIC_IRQ((irq) - PIRQ_BASE))
+#elif defined(CONFIG_X86)
+#define identity_mapped_irq(irq) (((irq) - PIRQ_BASE) < 16)
+#else
+#define identity_mapped_irq(irq) (0)
#endif
int evtchn_map_pirq(int irq, int xen_pirq)
@@ -771,10 +772,10 @@ int evtchn_map_pirq(int irq, int xen_pir
if (irq < 0) {
static DEFINE_SPINLOCK(irq_alloc_lock);
- irq = pirq_to_irq(NR_PIRQS - 1);
+ irq = PIRQ_BASE + NR_PIRQS - 1;
spin_lock(&irq_alloc_lock);
do {
- if (!IO_APIC_IRQ(irq))
+ if (identity_mapped_irq(irq))
continue;
if (!index_from_irq(irq)) {
BUG_ON(type_from_irq(irq) != IRQT_UNBOUND);
@@ -782,9 +783,9 @@ int evtchn_map_pirq(int irq, int xen_pir
xen_pirq, 0);
break;
}
- } while (--irq);
+ } while (--irq >= PIRQ_BASE);
spin_unlock(&irq_alloc_lock);
- if (irq < pirq_to_irq(16))
+ if (irq < PIRQ_BASE)
return -ENOSPC;
} else if (!xen_pirq) {
if (unlikely(type_from_irq(irq) != IRQT_PIRQ))
@@ -803,29 +804,28 @@ int evtchn_map_pirq(int irq, int xen_pir
int evtchn_get_xen_pirq(int irq)
{
- if (!IO_APIC_IRQ(irq))
+ if (identity_mapped_irq(irq))
return irq;
- if (unlikely(type_from_irq(irq) != IRQT_PIRQ))
- return 0;
+ BUG_ON(type_from_irq(irq) != IRQT_PIRQ);
return index_from_irq(irq);
}
-static inline void pirq_unmask_notify(int pirq)
-{
- struct physdev_eoi eoi = { .irq = pirq };
- if (unlikely(test_bit(pirq, pirq_needs_eoi)))
+static inline void pirq_unmask_notify(int irq)
+{
+ struct physdev_eoi eoi = { .irq = evtchn_get_xen_pirq(irq) };
+ if (unlikely(test_bit(irq - PIRQ_BASE, pirq_needs_eoi)))
VOID(HYPERVISOR_physdev_op(PHYSDEVOP_eoi, &eoi));
}
-static inline void pirq_query_unmask(int pirq)
+static inline void pirq_query_unmask(int irq)
{
struct physdev_irq_status_query irq_status;
- irq_status.irq = pirq;
+ irq_status.irq = evtchn_get_xen_pirq(irq);
if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status))
irq_status.flags = 0;
- clear_bit(pirq, pirq_needs_eoi);
+ clear_bit(irq - PIRQ_BASE, pirq_needs_eoi);
if (irq_status.flags & XENIRQSTAT_needs_eoi)
- set_bit(pirq, pirq_needs_eoi);
+ set_bit(irq - PIRQ_BASE, pirq_needs_eoi);
}
/*
@@ -853,7 +853,7 @@ static unsigned int startup_pirq(unsigne
}
evtchn = bind_pirq.port;
- pirq_query_unmask(irq_to_pirq(irq));
+ pirq_query_unmask(irq);
evtchn_to_irq[evtchn] = irq;
bind_evtchn_to_cpu(evtchn, 0);
@@ -861,7 +861,7 @@ static unsigned int startup_pirq(unsigne
out:
unmask_evtchn(evtchn);
- pirq_unmask_notify(irq_to_pirq(irq));
+ pirq_unmask_notify(irq);
return 0;
}
@@ -915,7 +915,7 @@ static void end_pirq(unsigned int irq)
shutdown_pirq(irq);
} else if (VALID_EVTCHN(evtchn)) {
unmask_evtchn(evtchn);
- pirq_unmask_notify(irq_to_pirq(irq));
+ pirq_unmask_notify(irq);
}
}
@@ -1062,7 +1062,7 @@ static void restore_cpu_ipis(unsigned in
void irq_resume(void)
{
- unsigned int cpu, pirq, irq, evtchn;
+ unsigned int cpu, irq, evtchn;
init_evtchn_cpu_bindings();
@@ -1071,8 +1071,8 @@ void irq_resume(void)
mask_evtchn(evtchn);
/* Check that no PIRQs are still bound. */
- for (pirq = 0; pirq < NR_PIRQS; pirq++)
- BUG_ON(irq_info[pirq_to_irq(pirq)] != IRQ_UNBOUND);
+ for (irq = PIRQ_BASE; irq < (PIRQ_BASE + NR_PIRQS); irq++)
+ BUG_ON(irq_info[irq] != IRQ_UNBOUND);
/* No IRQ <-> event-channel mappings. */
for (irq = 0; irq < NR_IRQS; irq++)
@@ -1102,28 +1102,29 @@ void __init xen_init_IRQ(void)
irq_info[i] = IRQ_UNBOUND;
/* Dynamic IRQ space is currently unbound. Zero the refcnts. */
- for (i = 0; i < NR_DYNIRQS; i++) {
- irq_bindcount[dynirq_to_irq(i)] = 0;
-
- irq_desc[dynirq_to_irq(i)].status = IRQ_DISABLED;
- irq_desc[dynirq_to_irq(i)].action = NULL;
- irq_desc[dynirq_to_irq(i)].depth = 1;
- irq_desc[dynirq_to_irq(i)].chip = &dynirq_type;
+ for (i = DYNIRQ_BASE; i < (DYNIRQ_BASE + NR_DYNIRQS); i++) {
+ irq_bindcount[i] = 0;
+
+ irq_desc[i].status = IRQ_DISABLED;
+ irq_desc[i].action = NULL;
+ irq_desc[i].depth = 1;
+ irq_desc[i].chip = &dynirq_type;
}
/* Phys IRQ space is statically bound (1:1 mapping). Nail refcnts. */
- for (i = 0; i < NR_PIRQS; i++) {
- irq_bindcount[pirq_to_irq(i)] = 1;
+ for (i = PIRQ_BASE; i < (PIRQ_BASE + NR_PIRQS); i++) {
+ irq_bindcount[i] = 1;
#ifdef RTC_IRQ
/* If not domain 0, force our RTC driver to fail its probe. */
- if ((i == RTC_IRQ) && !is_initial_xendomain())
+ if (identity_mapped_irq(i) && ((i - PIRQ_BASE) == RTC_IRQ)
+ && !is_initial_xendomain())
continue;
#endif
- irq_desc[pirq_to_irq(i)].status = IRQ_DISABLED;
- irq_desc[pirq_to_irq(i)].action = NULL;
- irq_desc[pirq_to_irq(i)].depth = 1;
- irq_desc[pirq_to_irq(i)].chip = &pirq_type;
- }
-}
+ irq_desc[i].status = IRQ_DISABLED;
+ irq_desc[i].action = NULL;
+ irq_desc[i].depth = 1;
+ irq_desc[i].chip = &pirq_type;
+ }
+}
diff -r de4d39818577 -r 0ba49e9e74f9 include/asm-i386/mach-xen/irq_vectors.h
--- a/include/asm-i386/mach-xen/irq_vectors.h Fri Sep 12 10:37:32 2008 +0100
+++ b/include/asm-i386/mach-xen/irq_vectors.h Tue Sep 16 10:39:05 2008 +0100
@@ -122,10 +122,4 @@
#define NR_IRQS (NR_PIRQS + NR_DYNIRQS)
#define NR_IRQ_VECTORS NR_IRQS
-#define pirq_to_irq(_x) ((_x) + PIRQ_BASE)
-#define irq_to_pirq(_x) ((_x) - PIRQ_BASE)
-
-#define dynirq_to_irq(_x) ((_x) + DYNIRQ_BASE)
-#define irq_to_dynirq(_x) ((_x) - DYNIRQ_BASE)
-
#endif /* _ASM_IRQ_VECTORS_H */
diff -r de4d39818577 -r 0ba49e9e74f9 include/asm-ia64/irq.h
--- a/include/asm-ia64/irq.h Fri Sep 12 10:37:32 2008 +0100
+++ b/include/asm-ia64/irq.h Tue Sep 16 10:39:05 2008 +0100
@@ -34,12 +34,6 @@
#define NR_IRQS (NR_PIRQS + NR_DYNIRQS)
#define NR_IRQ_VECTORS NR_IRQS
-#define pirq_to_irq(_x) ((_x) + PIRQ_BASE)
-#define irq_to_pirq(_x) ((_x) - PIRQ_BASE)
-
-#define dynirq_to_irq(_x) ((_x) + DYNIRQ_BASE)
-#define irq_to_dynirq(_x) ((_x) - DYNIRQ_BASE)
-
#define RESCHEDULE_VECTOR 0
#define IPI_VECTOR 1
#define CMCP_VECTOR 2
diff -r de4d39818577 -r 0ba49e9e74f9 include/asm-powerpc/xen/asm/hypervisor.h
--- a/include/asm-powerpc/xen/asm/hypervisor.h Fri Sep 12 10:37:32 2008 +0100
+++ b/include/asm-powerpc/xen/asm/hypervisor.h Tue Sep 16 10:39:05 2008 +0100
@@ -154,13 +154,6 @@ int direct_remap_pfn_range(struct vm_are
#define NR_IRQ_VECTORS NR_IRQS
-#define pirq_to_irq(_x) ((_x) + PIRQ_BASE)
-#define irq_to_pirq(_x) ((_x) - PIRQ_BASE)
-
-#define dynirq_to_irq(_x) ((_x) + DYNIRQ_BASE)
-#define irq_to_dynirq(_x) ((_x) - DYNIRQ_BASE)
-
-
/* END: all of these need a new home */
#if defined(CONFIG_X86_64)
diff -r de4d39818577 -r 0ba49e9e74f9 include/asm-x86_64/mach-xen/irq_vectors.h
--- a/include/asm-x86_64/mach-xen/irq_vectors.h Fri Sep 12 10:37:32 2008 +0100
+++ b/include/asm-x86_64/mach-xen/irq_vectors.h Tue Sep 16 10:39:05 2008 +0100
@@ -114,10 +114,4 @@
#define NR_IRQS (NR_PIRQS + NR_DYNIRQS)
#define NR_IRQ_VECTORS NR_IRQS
-#define pirq_to_irq(_x) ((_x) + PIRQ_BASE)
-#define irq_to_pirq(_x) ((_x) - PIRQ_BASE)
-
-#define dynirq_to_irq(_x) ((_x) + DYNIRQ_BASE)
-#define irq_to_dynirq(_x) ((_x) - DYNIRQ_BASE)
-
#endif /* _ASM_IRQ_VECTORS_H */
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