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Subject[PATCH 10/19] x86, io_apic: Introduce function pointer for setup_timer_IRQ0_pin
Date
This function must be a NOP with interrupt remapping
enabled. So use a funtion pointer for it which points to an
empty function when irq_remapping_enabled == true.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/include/asm/io_apic.h | 5 +++++
arch/x86/include/asm/x86_init.h | 3 +++
arch/x86/kernel/apic/io_apic.c | 11 ++++-------
arch/x86/kernel/x86_init.c | 1 +
drivers/iommu/irq_remapping.c | 7 +++++++
5 files changed, 20 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2cefc56..d74d5f4 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -152,6 +152,11 @@ extern void ioapic_insert_resources(void);
extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
unsigned int, int,
struct io_apic_irq_attr *);
+extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
+ unsigned int, int,
+ struct io_apic_irq_attr *);
+extern void __init native_setup_timer_pin(unsigned int ioapic_idx,
+ unsigned int pin, int vector);

int io_apic_setup_irq_pin_once(unsigned int irq, int node, struct io_apic_irq_attr *attr);

diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index bc13022..ffe5860 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -207,6 +207,9 @@ struct x86_io_apic_ops {
int (*setup_entry)(int irq, struct IO_APIC_route_entry *entry,
unsigned int destination, int vector,
struct io_apic_irq_attr *attr);
+ void (*setup_timer_pin)(unsigned int ioapic_idx,
+ unsigned int pin, int vector);
+
};

extern struct x86_init_ops x86_init;
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 5e12614..d17ae46 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1473,15 +1473,12 @@ void setup_IO_APIC_irq_extra(u32 gsi)
/*
* Set up the timer pin, possibly with the 8259A-master behind.
*/
-static void __init setup_timer_IRQ0_pin(unsigned int ioapic_idx,
- unsigned int pin, int vector)
+void __init native_setup_timer_pin(unsigned int ioapic_idx,
+ unsigned int pin, int vector)
{
struct IO_APIC_route_entry entry;
unsigned int dest;

- if (irq_remapping_enabled)
- return;
-
memset(&entry, 0, sizeof(entry));

/*
@@ -2791,7 +2788,7 @@ static inline void __init check_timer(void)
*/
if (no_pin1) {
add_pin_to_irq_node(cfg, node, apic1, pin1);
- setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
+ x86_io_apic_ops.setup_timer_pin(apic1, pin1, cfg->vector);
} else {
/* for edge trigger, setup_ioapic_irq already
* leave it unmasked.
@@ -2823,7 +2820,7 @@ static inline void __init check_timer(void)
* legacy devices should be connected to IO APIC #0
*/
replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
- setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
+ x86_io_apic_ops.setup_timer_pin(apic2, pin2, cfg->vector);
legacy_pic->unmask(0);
if (timer_irq_works()) {
apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 3cd6bf7..eba02e5 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -130,4 +130,5 @@ struct x86_io_apic_ops x86_io_apic_ops = {
.print_entries = native_io_apic_print_entries,
.set_affinity = native_ioapic_set_affinity,
.setup_entry = native_setup_ioapic_entry,
+ .setup_timer_pin = native_setup_timer_pin,
};
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 827f8a1..71824fc 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -87,11 +87,18 @@ error:
return ret;
}

+static void __init irq_remapping_setup_timer_pin(unsigned int ioapic_idx,
+ unsigned int pin, int vector)
+{
+ /* Not needed with interrupt remapping */
+}
+
static void __init irq_remapping_modify_x86_ops(void)
{
x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
x86_io_apic_ops.set_affinity = set_remapped_irq_affinity;
x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry;
+ x86_io_apic_ops.setup_timer_pin = irq_remapping_setup_timer_pin;
x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs;
x86_msi.setup_hpet_msi = setup_hpet_msi_remapped;
}
--
1.7.9.5



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