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Diffstat (limited to 'arch/i386/kernel/io_apic.c')
-rw-r--r--arch/i386/kernel/io_apic.c73
1 files changed, 38 insertions, 35 deletions
diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c
index 6578f40bd501..1efdc76ae96d 100644
--- a/arch/i386/kernel/io_apic.c
+++ b/arch/i386/kernel/io_apic.c
@@ -33,6 +33,7 @@
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/sysdev.h>
+
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/desc.h>
@@ -77,7 +78,7 @@ static struct irq_pin_list {
int apic, pin, next;
} irq_2_pin[PIN_MAP_SIZE];
-int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
+int vector_irq[NR_VECTORS] __read_mostly = { [0 ... NR_VECTORS - 1] = -1};
#ifdef CONFIG_PCI_MSI
#define vector_to_irq(vector) \
(platform_legacy_irq(vector) ? vector : vector_irq[vector])
@@ -222,13 +223,21 @@ static void clear_IO_APIC (void)
clear_IO_APIC_pin(apic, pin);
}
+#ifdef CONFIG_SMP
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
{
unsigned long flags;
int pin;
struct irq_pin_list *entry = irq_2_pin + irq;
unsigned int apicid_value;
+ cpumask_t tmp;
+ cpus_and(tmp, cpumask, cpu_online_map);
+ if (cpus_empty(tmp))
+ tmp = TARGET_CPUS;
+
+ cpus_and(cpumask, tmp, CPU_MASK_ALL);
+
apicid_value = cpu_mask_to_apicid(cpumask);
/* Prepare to do the io_apic_write */
apicid_value = apicid_value << 24;
@@ -242,6 +251,7 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
break;
entry = irq_2_pin + entry->next;
}
+ set_irq_info(irq, cpumask);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
@@ -259,7 +269,6 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
# define Dprintk(x...)
# endif
-cpumask_t __cacheline_aligned pending_irq_balance_cpumask[NR_IRQS];
#define IRQBALANCE_CHECK_ARCH -999
static int irqbalance_disabled = IRQBALANCE_CHECK_ARCH;
@@ -328,12 +337,7 @@ static inline void balance_irq(int cpu, int irq)
cpus_and(allowed_mask, cpu_online_map, irq_affinity[irq]);
new_cpu = move(cpu, allowed_mask, now, 1);
if (cpu != new_cpu) {
- irq_desc_t *desc = irq_desc + irq;
- unsigned long flags;
-
- spin_lock_irqsave(&desc->lock, flags);
- pending_irq_balance_cpumask[irq] = cpumask_of_cpu(new_cpu);
- spin_unlock_irqrestore(&desc->lock, flags);
+ set_pending_irq(irq, cpumask_of_cpu(new_cpu));
}
}
@@ -528,16 +532,12 @@ tryanotherirq:
cpus_and(tmp, target_cpu_mask, allowed_mask);
if (!cpus_empty(tmp)) {
- irq_desc_t *desc = irq_desc + selected_irq;
- unsigned long flags;
Dprintk("irq = %d moved to cpu = %d\n",
selected_irq, min_loaded);
/* mark for change destination */
- spin_lock_irqsave(&desc->lock, flags);
- pending_irq_balance_cpumask[selected_irq] =
- cpumask_of_cpu(min_loaded);
- spin_unlock_irqrestore(&desc->lock, flags);
+ set_pending_irq(selected_irq, cpumask_of_cpu(min_loaded));
+
/* Since we made a change, come back sooner to
* check for more variation.
*/
@@ -568,7 +568,8 @@ static int balanced_irq(void *unused)
/* push everything to CPU 0 to give us a starting point. */
for (i = 0 ; i < NR_IRQS ; i++) {
- pending_irq_balance_cpumask[i] = cpumask_of_cpu(0);
+ pending_irq_cpumask[i] = cpumask_of_cpu(0);
+ set_pending_irq(i, cpumask_of_cpu(0));
}
for ( ; ; ) {
@@ -647,20 +648,9 @@ int __init irqbalance_disable(char *str)
__setup("noirqbalance", irqbalance_disable);
-static inline void move_irq(int irq)
-{
- /* note - we hold the desc->lock */
- if (unlikely(!cpus_empty(pending_irq_balance_cpumask[irq]))) {
- set_ioapic_affinity_irq(irq, pending_irq_balance_cpumask[irq]);
- cpus_clear(pending_irq_balance_cpumask[irq]);
- }
-}
-
late_initcall(balanced_irq_init);
-
-#else /* !CONFIG_IRQBALANCE */
-static inline void move_irq(int irq) { }
#endif /* CONFIG_IRQBALANCE */
+#endif /* CONFIG_SMP */
#ifndef CONFIG_SMP
void fastcall send_IPI_self(int vector)
@@ -820,6 +810,7 @@ EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
* we need to reprogram the ioredtbls to cater for the cpus which have come online
* so mask in all cases should simply be TARGET_CPUS
*/
+#ifdef CONFIG_SMP
void __init setup_ioapic_dest(void)
{
int pin, ioapic, irq, irq_entry;
@@ -838,6 +829,7 @@ void __init setup_ioapic_dest(void)
}
}
+#endif
/*
* EISA Edge/Level control register, ELCR
@@ -1127,7 +1119,7 @@ static inline int IO_APIC_irq_trigger(int irq)
}
/* irq_vectors is indexed by the sum of all RTEs in all I/O APICs. */
-u8 irq_vector[NR_IRQ_VECTORS] = { FIRST_DEVICE_VECTOR , 0 };
+u8 irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
int assign_irq_vector(int irq)
{
@@ -1249,6 +1241,7 @@ static void __init setup_IO_APIC_irqs(void)
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
+ set_native_irq_info(irq, TARGET_CPUS);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
}
@@ -1641,9 +1634,9 @@ void disable_IO_APIC(void)
clear_IO_APIC();
/*
- * If the i82559 is routed through an IOAPIC
+ * If the i8259 is routed through an IOAPIC
* Put that IOAPIC in virtual wire mode
- * so legacy interrups can be delivered.
+ * so legacy interrupts can be delivered.
*/
pin = find_isa_irq_pin(0, mp_ExtINT);
if (pin != -1) {
@@ -1944,6 +1937,7 @@ static void ack_edge_ioapic_vector(unsigned int vector)
{
int irq = vector_to_irq(vector);
+ move_irq(vector);
ack_edge_ioapic_irq(irq);
}
@@ -1958,6 +1952,7 @@ static void end_level_ioapic_vector (unsigned int vector)
{
int irq = vector_to_irq(vector);
+ move_irq(vector);
end_level_ioapic_irq(irq);
}
@@ -1975,14 +1970,17 @@ static void unmask_IO_APIC_vector (unsigned int vector)
unmask_IO_APIC_irq(irq);
}
+#ifdef CONFIG_SMP
static void set_ioapic_affinity_vector (unsigned int vector,
cpumask_t cpu_mask)
{
int irq = vector_to_irq(vector);
+ set_native_irq_info(vector, cpu_mask);
set_ioapic_affinity_irq(irq, cpu_mask);
}
#endif
+#endif
/*
* Level and edge triggered IO-APIC interrupts need different handling,
@@ -1992,7 +1990,7 @@ static void set_ioapic_affinity_vector (unsigned int vector,
* edge-triggered handler, without risking IRQ storms and other ugly
* races.
*/
-static struct hw_interrupt_type ioapic_edge_type = {
+static struct hw_interrupt_type ioapic_edge_type __read_mostly = {
.typename = "IO-APIC-edge",
.startup = startup_edge_ioapic,
.shutdown = shutdown_edge_ioapic,
@@ -2000,10 +1998,12 @@ static struct hw_interrupt_type ioapic_edge_type = {
.disable = disable_edge_ioapic,
.ack = ack_edge_ioapic,
.end = end_edge_ioapic,
+#ifdef CONFIG_SMP
.set_affinity = set_ioapic_affinity,
+#endif
};
-static struct hw_interrupt_type ioapic_level_type = {
+static struct hw_interrupt_type ioapic_level_type __read_mostly = {
.typename = "IO-APIC-level",
.startup = startup_level_ioapic,
.shutdown = shutdown_level_ioapic,
@@ -2011,7 +2011,9 @@ static struct hw_interrupt_type ioapic_level_type = {
.disable = disable_level_ioapic,
.ack = mask_and_ack_level_ioapic,
.end = end_level_ioapic,
+#ifdef CONFIG_SMP
.set_affinity = set_ioapic_affinity,
+#endif
};
static inline void init_IO_APIC_traps(void)
@@ -2074,7 +2076,7 @@ static void ack_lapic_irq (unsigned int irq)
static void end_lapic_irq (unsigned int i) { /* nothing */ }
-static struct hw_interrupt_type lapic_irq_type = {
+static struct hw_interrupt_type lapic_irq_type __read_mostly = {
.typename = "local-APIC-edge",
.startup = NULL, /* startup_irq() not used for IRQ0 */
.shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
@@ -2421,7 +2423,7 @@ device_initcall(ioapic_init_sysfs);
ACPI-based IOAPIC Configuration
-------------------------------------------------------------------------- */
-#ifdef CONFIG_ACPI_BOOT
+#ifdef CONFIG_ACPI
int __init io_apic_get_unique_id (int ioapic, int apic_id)
{
@@ -2569,9 +2571,10 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1));
io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0));
+ set_native_irq_info(use_pci_vector() ? entry.vector : irq, TARGET_CPUS);
spin_unlock_irqrestore(&ioapic_lock, flags);
return 0;
}
-#endif /*CONFIG_ACPI_BOOT*/
+#endif /* CONFIG_ACPI */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.