[PATCH 5/8] x86-64: add support for remotely triggering the block softirq

Jens Axboe
2008-02-07T09:22:01Z

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
arch/x86/kernel/entry_64.S | 3 +++
arch/x86/kernel/i8259_64.c | 3 +++
arch/x86/kernel/smp_64.c | 15 +++++++++++++++
include/asm-x86/hw_irq_64.h | 2 ++
4 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index c7341e8..753834b 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -704,6 +704,9 @@ END(invalidate_interrupt\num)
ENTRY(call_function_interrupt)
apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt
END(call_function_interrupt)
+ENTRY(raise_block_softirq)
+ apicinterrupt BLOCK_SOFTIRQ_VECTOR,smp_raise_block_softirq
+END(raise_block_softirq);
ENTRY(irq_move_cleanup_interrupt)
apicinterrupt IRQ_MOVE_CLEANUP_VECTOR,smp_irq_move_cleanup_interrupt
END(irq_move_cleanup_interrupt)
diff --git a/arch/x86/kernel/i8259_64.c b/arch/x86/kernel/i8259_64.c
index fa57a15..cd7675b 100644
--- a/arch/x86/kernel/i8259_64.c
+++ b/arch/x86/kernel/i8259_64.c
@@ -494,6 +494,9 @@ void __init native_init_IRQ(void)
/* IPI for generic function call */
set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);

+ /* IPI for raising block softirq on another CPU */
+ set_intr_gate(BLOCK_SOFTIRQ_VECTOR, raise_block_softirq);
+
/* Low priority IPI to cleanup after moving an irq */
set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
#endif
diff --git a/arch/x86/kernel/smp_64.c b/arch/x86/kernel/smp_64.c
index 2fd74b0..fe4c2bf 100644
--- a/arch/x86/kernel/smp_64.c
+++ b/arch/x86/kernel/smp_64.c
@@ -460,6 +460,21 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
}
EXPORT_SYMBOL(smp_call_function);

+asmlinkage void smp_raise_block_softirq(void)
+{
+ unsigned long flags;
+
+ ack_APIC_irq();
+ local_irq_save(flags);
+ raise_softirq_irqoff(BLOCK_SOFTIRQ);
+ local_irq_restore(flags);
+}
+
+void arch_raise_softirq_on_cpu(int cpu, unsigned int nr)
+{
+ send_IPI_mask(cpumask_of_cpu(cpu), BLOCK_SOFTIRQ_VECTOR);
+}
+
static void stop_this_cpu(void *dummy)
{
local_irq_disable();
diff --git a/include/asm-x86/hw_irq_64.h b/include/asm-x86/hw_irq_64.h
index 312a58d..98ed167 100644
--- a/include/asm-x86/hw_irq_64.h
+++ b/include/asm-x86/hw_irq_64.h
@@ -68,6 +68,7 @@
#define ERROR_APIC_VECTOR 0xfe
#define RESCHEDULE_VECTOR 0xfd
#define CALL_FUNCTION_VECTOR 0xfc
+#define BLOCK_SOFTIRQ_VECTOR 0xfb
/* fb free - please don't readd KDB here because it's useless
(hint - think what a NMI bit does to a vector) */
#define THERMAL_APIC_VECTOR 0xfa
@@ -102,6 +103,7 @@ void spurious_interrupt(void);
void error_interrupt(void);
void reschedule_interrupt(void);
void call_function_interrupt(void);
+void raise_block_softirq(void);
void irq_move_cleanup_interrupt(void);
void invalidate_interrupt0(void);
void invalidate_interrupt1(void);
--
1.5.4.22.g7a20