[PATCH v2 02/26] x86, irq: Modify irq chip once for irq remapping

Yinghai Lu
2013-02-08T19:34:37Z

Now after irq remapping is enabled, irq_chip fields are modified during
every irq setup.

Only need to change them one during we enable irq mapping.

Also change irq_remap_modify_chip_defaults() to __init.

We don't need to use #ifdef in irq_remap_modify_chips(), as
IRQ_REMAP only support x86_64 AND X86_IO_APIC AND PCI_MSI,
also HPET_TIMER is set when x86_64 is set.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Joerg Roedel <joro@8bytes.org>
---
arch/x86/include/asm/io_apic.h | 5 +++++
arch/x86/kernel/apic/apic.c | 9 ++++++++-
arch/x86/kernel/apic/io_apic.c | 8 +++-----
drivers/iommu/irq_remapping.c | 11 +++++++++--
4 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 459e50a..eaff3ad 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -215,6 +215,11 @@ static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned

extern void io_apic_eoi(unsigned int apic, unsigned int vector);

+extern struct irq_chip ioapic_chip;
+extern struct irq_chip msi_chip;
+extern struct irq_chip hpet_msi_type;
+void irq_remap_modify_chips(void);
+
#else /* !CONFIG_X86_IO_APIC */

#define io_apic_assign_pci_irqs 0
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index a5b4dce..84815b1 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1552,6 +1552,8 @@ void enable_x2apic(void)
int __init enable_IR(void)
{
#ifdef CONFIG_IRQ_REMAP
+ int ret;
+
if (!irq_remapping_supported()) {
pr_debug("intr-remapping not supported\n");
return -1;
@@ -1563,7 +1565,12 @@ int __init enable_IR(void)
return -1;
}

- return irq_remapping_enable();
+ ret = irq_remapping_enable();
+
+ if (ret >= 0)
+ irq_remap_modify_chips();
+
+ return ret;
#endif
return -1;
}
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 9ed796c..f78f7f6 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1238,8 +1238,6 @@ void __setup_vector_irq(int cpu)
raw_spin_unlock(&vector_lock);
}

-static struct irq_chip ioapic_chip;
-
#ifdef CONFIG_X86_32
static inline int IO_APIC_irq_trigger(int irq)
{
@@ -2511,7 +2509,7 @@ static void ack_apic_level(struct irq_data *data)
ioapic_irqd_unmask(data, cfg, masked);
}

-static struct irq_chip ioapic_chip __read_mostly = {
+struct irq_chip ioapic_chip __read_mostly = {
.name = "IO-APIC",
.irq_startup = startup_ioapic_irq,
.irq_mask = mask_ioapic_irq,
@@ -3093,7 +3091,7 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
* IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
* which implement the MSI or MSI-X Capability Structure.
*/
-static struct irq_chip msi_chip = {
+struct irq_chip msi_chip = {
.name = "PCI-MSI",
.irq_unmask = unmask_msi_irq,
.irq_mask = mask_msi_irq,
@@ -3240,7 +3238,7 @@ static int hpet_msi_set_affinity(struct irq_data *data,
return IRQ_SET_MASK_OK_NOCOPY;
}

-static struct irq_chip hpet_msi_type = {
+struct irq_chip hpet_msi_type = {
.name = "HPET_MSI",
.irq_unmask = hpet_msi_unmask,
.irq_mask = hpet_msi_mask,
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 01ed477..33918c3 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -368,19 +368,26 @@ static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
seq_printf(p, " IR-%s", data->chip->name);
}

-static void irq_remap_modify_chip_defaults(struct irq_chip *chip)
+static void __init irq_remap_modify_chip_defaults(struct irq_chip *chip)
{
+ printk(KERN_DEBUG "irq_chip: %s ==> IR-%s", chip->name, chip->name);
chip->irq_print_chip = ir_print_prefix;
chip->irq_ack = ir_ack_apic_edge;
chip->irq_eoi = ir_ack_apic_level;
chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
}

+void __init irq_remap_modify_chips(void)
+{
+ irq_remap_modify_chip_defaults(&ioapic_chip);
+ irq_remap_modify_chip_defaults(&msi_chip);
+ irq_remap_modify_chip_defaults(&hpet_msi_type);
+}
+
bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
{
if (!irq_remapped(cfg))
return false;
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
- irq_remap_modify_chip_defaults(chip);
return true;
}
--
1.7.10.4