diff options
| -rw-r--r-- | arch/x86/kernel/mpparse_32.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kernel/mpparse_32.c b/arch/x86/kernel/mpparse_32.c index 22fc8d7dec1..bfcfc41f560 100644 --- a/arch/x86/kernel/mpparse_32.c +++ b/arch/x86/kernel/mpparse_32.c @@ -1041,13 +1041,14 @@ void __init mp_config_acpi_legacy_irqs (void) } #define MAX_GSI_NUM 4096 +#define IRQ_COMPRESSION_START 64 int mp_register_gsi(u32 gsi, int triggering, int polarity) { int ioapic = -1; int ioapic_pin = 0; int idx, bit = 0; - static int pci_irq = 16; + static int pci_irq = IRQ_COMPRESSION_START; /* * Mapping between Global System Interrups, which * represent all possible interrupts, and IRQs @@ -1086,12 +1087,16 @@ int mp_register_gsi(u32 gsi, int triggering, int polarity) if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) { Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n", mp_ioapic_routing[ioapic].apic_id, ioapic_pin); - return gsi_to_irq[gsi]; + return (gsi < IRQ_COMPRESSION_START ? gsi : gsi_to_irq[gsi]); } mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit); - if (triggering == ACPI_LEVEL_SENSITIVE) { + /* + * For GSI >= 64, use IRQ compression + */ + if ((gsi >= IRQ_COMPRESSION_START) + && (triggering == ACPI_LEVEL_SENSITIVE)) { /* * For PCI devices assign IRQs in order, avoiding gaps * due to unused I/O APIC pins. |