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Message-Id: <1376189139-31856-7-git-send-email-yinghai@kernel.org>
Date: Sat, 10 Aug 2013 19:45:16 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"Rafael J. Wysocki" <rjw@...k.pl>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
Joerg Roedel <joro@...tes.org>
Subject: [PATCH 05/28] x86, irq: Modify irq chip once for irq remapping
Current code: after irq remapping is enabled, irq_chip fields are modified
during every irq setup.
mp_register_gsi
io_apic_set_pci_routing
io_apic_setup_irq_pin
setup_ioapic_irq
ioapic_register_intr
setup_remapped_irq
native_setup_msi_irqs
setup_msi_irq
setup_remapped_irq
default_setup_hpet_msi
setup_remapped_irq
that is not efficient.
We only need to modify those irq chip one time after we enable
irq remapping.
Change irq_remap_modify_chip_defaults() to __init as it only gets
called during booting stage, via irq_remap_modify_chips().
Affected irq_chip: ioapic_chip, msi_chip, hpet_msi_type.
We don't need to use #ifdef in irq_remap_modify_chips():
IRQ_REMAP only support x86_64 && X86_IO_APIC && PCI_MSI.
HPET_TIMER is selected when x86_64 is set.
When we have IRQ_REMAP enabled, al three chips are defined and
used.
-v3: Remove irq_chip in setup_remapped_irq according to Sebastian.
also add missing "\n" in printk.
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc: Joerg Roedel <joro@...tes.org>
---
arch/x86/include/asm/io_apic.h | 5 +++++
arch/x86/include/asm/irq_remapping.h | 8 ++------
arch/x86/kernel/apic/apic.c | 9 ++++++++-
arch/x86/kernel/apic/io_apic.c | 14 ++++++--------
drivers/iommu/irq_remapping.c | 13 ++++++++++---
5 files changed, 31 insertions(+), 18 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/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index 606f42e..304c93f 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -52,9 +52,7 @@ extern void compose_remapped_msi_msg(struct pci_dev *pdev,
struct msi_msg *msg, u8 hpet_id);
extern int setup_hpet_msi_remapped(unsigned int irq, unsigned int id);
extern void panic_if_irq_remap(const char *msg);
-extern bool setup_remapped_irq(int irq,
- struct irq_cfg *cfg,
- struct irq_chip *chip);
+extern bool setup_remapped_irq(int irq, struct irq_cfg *cfg);
#else /* CONFIG_IRQ_REMAP */
@@ -89,9 +87,7 @@ static inline void panic_if_irq_remap(const char *msg)
{
}
-static inline bool setup_remapped_irq(int irq,
- struct irq_cfg *cfg,
- struct irq_chip *chip)
+static inline bool setup_remapped_irq(int irq, struct irq_cfg *cfg)
{
return false;
}
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index eca89c5..9b64203 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1571,6 +1571,8 @@ 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;
@@ -1582,7 +1584,12 @@ 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..eda56ad 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)
{
@@ -1280,7 +1278,7 @@ static void ioapic_register_intr(unsigned int irq, struct irq_cfg *cfg,
fasteoi = false;
}
- if (setup_remapped_irq(irq, cfg, chip))
+ if (setup_remapped_irq(irq, cfg))
fasteoi = trigger != 0;
hdl = fasteoi ? handle_fasteoi_irq : handle_edge_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,
@@ -3123,7 +3121,7 @@ int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
if (!irq_offset)
write_msi_msg(irq, &msg);
- setup_remapped_irq(irq, irq_get_chip_data(irq), chip);
+ setup_remapped_irq(irq, irq_get_chip_data(irq));
irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge");
@@ -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,
@@ -3261,7 +3259,7 @@ int default_setup_hpet_msi(unsigned int irq, unsigned int id)
hpet_msi_write(irq_get_handler_data(irq), &msg);
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
- setup_remapped_irq(irq, irq_get_chip_data(irq), chip);
+ setup_remapped_irq(irq, irq_get_chip_data(irq));
irq_set_chip_and_handler_name(irq, chip, handle_edge_irq, "edge");
return 0;
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 85ae2cf..8e4e3af 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -375,19 +375,26 @@ 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\n", 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;
}
-bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
+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)
{
if (!irq_remapped(cfg))
return false;
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
- irq_remap_modify_chip_defaults(chip);
return true;
}
--
1.8.1.4
--
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