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-rw-r--r--arch/x86_64/kernel/i8259.c4
-rw-r--r--arch/x86_64/kernel/io_apic.c181
-rw-r--r--arch/x86_64/kernel/irq.c2
3 files changed, 138 insertions, 49 deletions
diff --git a/arch/x86_64/kernel/i8259.c b/arch/x86_64/kernel/i8259.c
index bddde431871..0612a33bb89 100644
--- a/arch/x86_64/kernel/i8259.c
+++ b/arch/x86_64/kernel/i8259.c
@@ -394,7 +394,7 @@ device_initcall(i8259A_init_sysfs);
*/
static struct irqaction irq2 = { no_action, 0, CPU_MASK_NONE, "cascade", NULL, NULL};
-int vector_irq[NR_VECTORS] __read_mostly = {
+DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
[0 ... FIRST_EXTERNAL_VECTOR - 1] = -1,
[FIRST_EXTERNAL_VECTOR + 0] = 0,
[FIRST_EXTERNAL_VECTOR + 1] = 1,
@@ -520,7 +520,7 @@ void __init init_IRQ(void)
* IRQ0 must be given a fixed assignment and initialized,
* because it's used before the IO-APIC is set up.
*/
- vector_irq[FIRST_DEVICE_VECTOR] = 0;
+ __get_cpu_var(vector_irq)[FIRST_DEVICE_VECTOR] = 0;
/*
* The reschedule interrupt is a CPU-to-CPU reschedule-helper
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 9f849492c29..7d53f66394a 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -44,7 +44,7 @@
#include <asm/nmi.h>
#include <asm/msidef.h>
-static int assign_irq_vector(int irq);
+static int assign_irq_vector(int irq, cpumask_t mask);
#define __apicdebuginit __init
@@ -135,11 +135,35 @@ static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
}
#ifdef CONFIG_SMP
+static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
+{
+ int apic, pin;
+ struct irq_pin_list *entry = irq_2_pin + irq;
+
+ BUG_ON(irq >= NR_IRQS);
+ for (;;) {
+ unsigned int reg;
+ apic = entry->apic;
+ pin = entry->pin;
+ if (pin == -1)
+ break;
+ io_apic_write(apic, 0x11 + pin*2, dest);
+ reg = io_apic_read(apic, 0x10 + pin*2);
+ reg &= ~0x000000ff;
+ reg |= vector;
+ io_apic_modify(apic, reg);
+ if (!entry->next)
+ break;
+ entry = irq_2_pin + entry->next;
+ }
+}
+
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
{
unsigned long flags;
unsigned int dest;
cpumask_t tmp;
+ int vector;
cpus_and(tmp, mask, cpu_online_map);
if (cpus_empty(tmp))
@@ -147,7 +171,13 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
cpus_and(mask, tmp, CPU_MASK_ALL);
- dest = cpu_mask_to_apicid(mask);
+ vector = assign_irq_vector(irq, mask);
+ if (vector < 0)
+ return;
+
+ cpus_clear(tmp);
+ cpu_set(vector >> 8, tmp);
+ dest = cpu_mask_to_apicid(tmp);
/*
* Only the high 8 bits are valid.
@@ -155,7 +185,7 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
dest = SET_APIC_LOGICAL_ID(dest);
spin_lock_irqsave(&ioapic_lock, flags);
- __DO_ACTION(1, = dest, )
+ __target_IO_APIC_irq(irq, dest, vector & 0xff);
set_native_irq_info(irq, mask);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
@@ -512,7 +542,7 @@ int gsi_irq_sharing(int gsi)
tries = NR_IRQS;
try_again:
- vector = assign_irq_vector(gsi);
+ vector = assign_irq_vector(gsi, TARGET_CPUS);
/*
* Sharing vectors means sharing IRQs, so scan irq_vectors for previous
@@ -591,45 +621,77 @@ 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] __read_mostly = { FIRST_DEVICE_VECTOR , 0 };
+unsigned int irq_vector[NR_IRQ_VECTORS] __read_mostly = { FIRST_EXTERNAL_VECTOR, 0 };
-static int __assign_irq_vector(int irq)
+static int __assign_irq_vector(int irq, cpumask_t mask)
{
- static int current_vector = FIRST_DEVICE_VECTOR, offset = 0;
- int vector;
+ /*
+ * NOTE! The local APIC isn't very good at handling
+ * multiple interrupts at the same interrupt level.
+ * As the interrupt level is determined by taking the
+ * vector number and shifting that right by 4, we
+ * want to spread these out a bit so that they don't
+ * all fall in the same interrupt level.
+ *
+ * Also, we've got to be careful not to trash gate
+ * 0x80, because int 0x80 is hm, kind of importantish. ;)
+ */
+ static struct {
+ int vector;
+ int offset;
+ } pos[NR_CPUS] = { [ 0 ... NR_CPUS - 1] = {FIRST_DEVICE_VECTOR, 0} };
+ int old_vector = -1;
+ int cpu;
BUG_ON((unsigned)irq >= NR_IRQ_VECTORS);
- if (IO_APIC_VECTOR(irq) > 0) {
- return IO_APIC_VECTOR(irq);
+ if (IO_APIC_VECTOR(irq) > 0)
+ old_vector = IO_APIC_VECTOR(irq);
+ if ((old_vector > 0) && cpu_isset(old_vector >> 8, mask)) {
+ return old_vector;
}
+
+ for_each_cpu_mask(cpu, mask) {
+ int vector, offset;
+ vector = pos[cpu].vector;
+ offset = pos[cpu].offset;
next:
- current_vector += 8;
- if (current_vector == IA32_SYSCALL_VECTOR)
- goto next;
-
- if (current_vector >= FIRST_SYSTEM_VECTOR) {
- /* If we run out of vectors on large boxen, must share them. */
- offset = (offset + 1) % 8;
- current_vector = FIRST_DEVICE_VECTOR + offset;
+ vector += 8;
+ if (vector >= FIRST_SYSTEM_VECTOR) {
+ /* If we run out of vectors on large boxen, must share them. */
+ offset = (offset + 1) % 8;
+ vector = FIRST_DEVICE_VECTOR + offset;
+ }
+ if (unlikely(pos[cpu].vector == vector))
+ continue;
+ if (vector == IA32_SYSCALL_VECTOR)
+ goto next;
+ if (per_cpu(vector_irq, cpu)[vector] != -1)
+ goto next;
+ /* Found one! */
+ pos[cpu].vector = vector;
+ pos[cpu].offset = offset;
+ if (old_vector >= 0) {
+ int old_cpu = old_vector >> 8;
+ old_vector &= 0xff;
+ per_cpu(vector_irq, old_cpu)[old_vector] = -1;
+ }
+ per_cpu(vector_irq, cpu)[vector] = irq;
+ vector |= cpu << 8;
+ IO_APIC_VECTOR(irq) = vector;
+ return vector;
}
-
- vector = current_vector;
- vector_irq[vector] = irq;
- IO_APIC_VECTOR(irq) = vector;
-
- return vector;
+ return -ENOSPC;
}
-static int assign_irq_vector(int irq)
+static int assign_irq_vector(int irq, cpumask_t mask)
{
int vector;
unsigned long flags;
spin_lock_irqsave(&vector_lock, flags);
- vector = __assign_irq_vector(irq);
+ vector = __assign_irq_vector(irq, mask);
spin_unlock_irqrestore(&vector_lock, flags);
-
return vector;
}
@@ -699,8 +761,15 @@ static void __init setup_IO_APIC_irqs(void)
continue;
if (IO_APIC_IRQ(irq)) {
- vector = assign_irq_vector(irq);
- entry.vector = vector;
+ cpumask_t mask;
+ vector = assign_irq_vector(irq, TARGET_CPUS);
+ if (vector < 0)
+ continue;
+
+ cpus_clear(mask);
+ cpu_set(vector >> 8, mask);
+ entry.dest.logical.logical_dest = cpu_mask_to_apicid(mask);
+ entry.vector = vector & 0xff;
ioapic_register_intr(irq, vector, IOAPIC_AUTO);
if (!apic && (irq < 16))
@@ -1197,7 +1266,14 @@ static unsigned int startup_ioapic_irq(unsigned int irq)
static int ioapic_retrigger_irq(unsigned int irq)
{
- send_IPI_self(IO_APIC_VECTOR(irq));
+ cpumask_t mask;
+ unsigned vector;
+
+ vector = irq_vector[irq];
+ cpus_clear(mask);
+ cpu_set(vector >> 8, mask);
+
+ send_IPI_mask(mask, vector & 0xff);
return 1;
}
@@ -1419,7 +1495,7 @@ static inline void check_timer(void)
* get/set the timer IRQ vector:
*/
disable_8259A_irq(0);
- vector = assign_irq_vector(0);
+ vector = assign_irq_vector(0, TARGET_CPUS);
/*
* Subtle, code in do_timer_interrupt() expects an AEOI
@@ -1662,7 +1738,7 @@ int create_irq(void)
continue;
if (irq_vector[new] != 0)
continue;
- vector = __assign_irq_vector(new);
+ vector = __assign_irq_vector(new, TARGET_CPUS);
if (likely(vector > 0))
irq = new;
break;
@@ -1698,12 +1774,12 @@ static int msi_msg_setup(struct pci_dev *pdev, unsigned int irq, struct msi_msg
int vector;
unsigned dest;
- vector = assign_irq_vector(irq);
+ vector = assign_irq_vector(irq, TARGET_CPUS);
if (vector >= 0) {
cpumask_t tmp;
cpus_clear(tmp);
- cpu_set(first_cpu(cpu_online_map), tmp);
+ cpu_set(vector >> 8, tmp);
dest = cpu_mask_to_apicid(tmp);
msg->address_hi = MSI_ADDR_BASE_HI;
@@ -1738,9 +1814,13 @@ static void msi_msg_set_affinity(unsigned int irq, cpumask_t mask, struct msi_ms
int vector;
unsigned dest;
- vector = assign_irq_vector(irq);
+ vector = assign_irq_vector(irq, mask);
if (vector > 0) {
- dest = cpu_mask_to_apicid(mask);
+ cpumask_t tmp;
+
+ cpus_clear(tmp);
+ cpu_set(vector >> 8, tmp);
+ dest = cpu_mask_to_apicid(tmp);
msg->data &= ~MSI_DATA_VECTOR_MASK;
msg->data |= MSI_DATA_VECTOR(vector);
@@ -1783,6 +1863,8 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p
{
struct IO_APIC_route_entry entry;
unsigned long flags;
+ int vector;
+ cpumask_t mask;
if (!IO_APIC_IRQ(irq)) {
apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
@@ -1790,6 +1872,21 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p
return -EINVAL;
}
+ irq = gsi_irq_sharing(irq);
+ /*
+ * IRQs < 16 are already in the irq_2_pin[] map
+ */
+ if (irq >= 16)
+ add_pin_to_irq(irq, ioapic, pin);
+
+
+ vector = assign_irq_vector(irq, TARGET_CPUS);
+ if (vector < 0)
+ return vector;
+
+ cpus_clear(mask);
+ cpu_set(vector >> 8, mask);
+
/*
* Generate a PCI IRQ routing entry and program the IOAPIC accordingly.
* Note that we mask (disable) IRQs now -- these get enabled when the
@@ -1800,19 +1897,11 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p
entry.delivery_mode = INT_DELIVERY_MODE;
entry.dest_mode = INT_DEST_MODE;
- entry.dest.logical.logical_dest = cpu_mask_to_apicid(TARGET_CPUS);
+ entry.dest.logical.logical_dest = cpu_mask_to_apicid(mask);
entry.trigger = triggering;
entry.polarity = polarity;
entry.mask = 1; /* Disabled (masked) */
-
- irq = gsi_irq_sharing(irq);
- /*
- * IRQs < 16 are already in the irq_2_pin[] map
- */
- if (irq >= 16)
- add_pin_to_irq(irq, ioapic, pin);
-
- entry.vector = assign_irq_vector(irq);
+ entry.vector = vector & 0xff;
apic_printk(APIC_VERBOSE,KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry (%d-%d -> 0x%x -> "
"IRQ %d Mode:%i Active:%i)\n", ioapic,
diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c
index 4542fb03199..506f27c85ca 100644
--- a/arch/x86_64/kernel/irq.c
+++ b/arch/x86_64/kernel/irq.c
@@ -110,7 +110,7 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
exit_idle();
irq_enter();
- irq = vector_irq[vector];
+ irq = __get_cpu_var(vector_irq)[vector];
if (unlikely(irq >= NR_IRQS)) {
printk(KERN_EMERG "%s: cannot handle IRQ %d\n",
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 17:14:17 +0000