[PATCH v2 17/26] x86, irq: Add ioapic_gsi_to_irq

Yinghai Lu
2013-02-08T19:32:58Z

For hot add ioapic, irq_base is not equal to gsi_base.

So we need a way to do mapping between gsi and irq.

Also remove irq_to_gsi that is causing confusing, just use that array
directly as only caller already check input irq before.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
---
arch/x86/include/asm/io_apic.h | 1 +
arch/x86/kernel/acpi/boot.c | 22 +++++-----------------
arch/x86/kernel/apic/io_apic.c | 29 ++++++++++++++++++++++++++++-
3 files changed, 34 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 8181fd8..02ac411 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -180,6 +180,7 @@ struct mp_ioapic_gsi{
};
extern struct mp_ioapic_gsi mp_gsi_routing[];
extern u32 gsi_top;
+int ioapic_gsi_to_irq(u32 gsi);
int mp_find_ioapic(u32 gsi);
int mp_find_ioapic_pin(int ioapic, u32 gsi);
void __init mp_register_ioapic(int id, u32 address, u32 gsi_base);
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index bacf4b0..350879f 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -112,6 +112,10 @@ static unsigned int gsi_to_irq(unsigned int gsi)
}
}

+#ifdef CONFIG_X86_IO_APIC
+ if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
+ return ioapic_gsi_to_irq(gsi);
+#endif
/* Provide an identity mapping of gsi == irq
* except on truly weird platforms that have
* non isa irqs in the first 16 gsis.
@@ -124,22 +128,6 @@ static unsigned int gsi_to_irq(unsigned int gsi)
return irq;
}

-static u32 irq_to_gsi(int irq)
-{
- unsigned int gsi;
-
- if (irq < NR_IRQS_LEGACY)
- gsi = isa_irq_to_gsi[irq];
- else if (irq < gsi_top)
- gsi = irq;
- else if (irq < (gsi_top + NR_IRQS_LEGACY))
- gsi = irq - gsi_top;
- else
- gsi = 0xffffffff;
-
- return gsi;
-}
-
/*
* Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
* to map the target physical address. The problem is that set_fixmap()
@@ -529,7 +517,7 @@ int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
{
if (isa_irq >= 16)
return -1;
- *gsi = irq_to_gsi(isa_irq);
+ *gsi = isa_irq_to_gsi[isa_irq];
return 0;
}

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index c499c88..9514728 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1044,13 +1044,16 @@ static int pin_2_irq(int idx, int apic, int pin)

if (test_bit(bus, mp_bus_not_pci)) {
irq = mp_irqs[idx].srcbusirq;
- } else {
+ } else if (gsi_cfg->gsi_base == gsi_cfg->irq_base) {
u32 gsi = gsi_cfg->gsi_base + pin;

if (gsi >= NR_IRQS_LEGACY)
irq = gsi;
else
irq = gsi_top + gsi;
+ } else {
+ /* hotadd ioapic */
+ irq = gsi_cfg->irq_base + pin;
}

#ifdef CONFIG_X86_32
@@ -1476,6 +1479,30 @@ static void __init setup_IO_APIC_irqs(void)
__io_apic_setup_irqs(ioapic_idx);
}

+int ioapic_gsi_to_irq(u32 gsi)
+{
+ int ioapic_idx = 0, irq = gsi;
+ struct mp_ioapic_gsi *gsi_cfg;
+
+ ioapic_idx = mp_find_ioapic(gsi);
+ if (ioapic_idx < 0)
+ return -1;
+
+ gsi_cfg = mp_ioapic_gsi_routing(ioapic_idx);
+ if (gsi_cfg->gsi_base == gsi_cfg->irq_base) {
+ if (gsi < NR_IRQS_LEGACY)
+ irq = gsi_top + gsi;
+ } else {
+ int pin = mp_find_ioapic_pin(ioapic_idx, gsi);
+
+ if (pin < 0)
+ return -1;
+ /* hotadd ioapic */
+ irq = gsi_cfg->irq_base + pin;
+ }
+
+ return irq;
+}
/*
* for the gsit that is not in first ioapic
* but could not use acpi_register_gsi()
--
1.7.10.4