Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 apic updates from Thomas Gleixner:
"This udpate contains:
- rework the irq vector array to store a pointer to the irq
descriptor instead of the irq number to avoid a lookup of the irq
descriptor in the irq entry path
- lguest interrupt handling cleanups
- conversion of the local apic timer to the new clockevent callbacks
- preparatory changes for the irq argument removal of interrupt flow
handlers"
* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/irq: Do not dereference irq descriptor before checking it
tools/lguest: Clean up include dir
tools/lguest: Fix redefinition of struct virtio_pci_cfg_cap
x86/irq: Store irq descriptor in vector array
genirq: Provide irq_desc_has_action
x86/irq: Get rid of an indentation level
x86/irq: Rename VECTOR_UNDEFINED to VECTOR_UNUSED
x86/irq: Replace numeric constant
x86/irq: Protect smp_cleanup_move
x86/lguest: Do not setup unused irq vectors
x86/lguest: Clean up lguest_setup_irq
x86/apic: Drop local_irq_save/restore in timer callbacks
x86/apic: Migrate apic timer to new set_state interface
x86/irq: Use access helper irq_data_get_affinity_mask()
x86/irq: Use accessor irq_data_get_irq_handler_data()
x86/irq: Use accessor irq_data_get_node()
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 2683f36..1bbd0fe 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -169,8 +169,7 @@
goto next;
for_each_cpu_and(new_cpu, vector_cpumask, cpu_online_mask) {
- if (per_cpu(vector_irq, new_cpu)[vector] >
- VECTOR_UNDEFINED)
+ if (!IS_ERR_OR_NULL(per_cpu(vector_irq, new_cpu)[vector]))
goto next;
}
/* Found one! */
@@ -182,7 +181,7 @@
cpumask_intersects(d->old_domain, cpu_online_mask);
}
for_each_cpu_and(new_cpu, vector_cpumask, cpu_online_mask)
- per_cpu(vector_irq, new_cpu)[vector] = irq;
+ per_cpu(vector_irq, new_cpu)[vector] = irq_to_desc(irq);
d->cfg.vector = vector;
cpumask_copy(d->domain, vector_cpumask);
err = 0;
@@ -224,15 +223,16 @@
static void clear_irq_vector(int irq, struct apic_chip_data *data)
{
- int cpu, vector;
+ struct irq_desc *desc;
unsigned long flags;
+ int cpu, vector;
raw_spin_lock_irqsave(&vector_lock, flags);
BUG_ON(!data->cfg.vector);
vector = data->cfg.vector;
for_each_cpu_and(cpu, data->domain, cpu_online_mask)
- per_cpu(vector_irq, cpu)[vector] = VECTOR_UNDEFINED;
+ per_cpu(vector_irq, cpu)[vector] = VECTOR_UNUSED;
data->cfg.vector = 0;
cpumask_clear(data->domain);
@@ -242,12 +242,13 @@
return;
}
+ desc = irq_to_desc(irq);
for_each_cpu_and(cpu, data->old_domain, cpu_online_mask) {
for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
vector++) {
- if (per_cpu(vector_irq, cpu)[vector] != irq)
+ if (per_cpu(vector_irq, cpu)[vector] != desc)
continue;
- per_cpu(vector_irq, cpu)[vector] = VECTOR_UNDEFINED;
+ per_cpu(vector_irq, cpu)[vector] = VECTOR_UNUSED;
break;
}
}
@@ -296,7 +297,7 @@
struct irq_alloc_info *info = arg;
struct apic_chip_data *data;
struct irq_data *irq_data;
- int i, err;
+ int i, err, node;
if (disable_apic)
return -ENXIO;
@@ -308,12 +309,13 @@
for (i = 0; i < nr_irqs; i++) {
irq_data = irq_domain_get_irq_data(domain, virq + i);
BUG_ON(!irq_data);
+ node = irq_data_get_node(irq_data);
#ifdef CONFIG_X86_IO_APIC
if (virq + i < nr_legacy_irqs() && legacy_irq_data[virq + i])
data = legacy_irq_data[virq + i];
else
#endif
- data = alloc_apic_chip_data(irq_data->node);
+ data = alloc_apic_chip_data(node);
if (!data) {
err = -ENOMEM;
goto error;
@@ -322,8 +324,7 @@
irq_data->chip = &lapic_controller;
irq_data->chip_data = data;
irq_data->hwirq = virq + i;
- err = assign_irq_vector_policy(virq + i, irq_data->node, data,
- info);
+ err = assign_irq_vector_policy(virq + i, node, data, info);
if (err)
goto error;
}
@@ -403,32 +404,32 @@
return arch_early_ioapic_init();
}
+/* Initialize vector_irq on a new cpu */
static void __setup_vector_irq(int cpu)
{
- /* Initialize vector_irq on a new cpu */
- int irq, vector;
struct apic_chip_data *data;
+ struct irq_desc *desc;
+ int irq, vector;
/* Mark the inuse vectors */
- for_each_active_irq(irq) {
- data = apic_chip_data(irq_get_irq_data(irq));
- if (!data)
- continue;
+ for_each_irq_desc(irq, desc) {
+ struct irq_data *idata = irq_desc_get_irq_data(desc);
- if (!cpumask_test_cpu(cpu, data->domain))
+ data = apic_chip_data(idata);
+ if (!data || !cpumask_test_cpu(cpu, data->domain))
continue;
vector = data->cfg.vector;
- per_cpu(vector_irq, cpu)[vector] = irq;
+ per_cpu(vector_irq, cpu)[vector] = desc;
}
/* Mark the free vectors */
for (vector = 0; vector < NR_VECTORS; ++vector) {
- irq = per_cpu(vector_irq, cpu)[vector];
- if (irq <= VECTOR_UNDEFINED)
+ desc = per_cpu(vector_irq, cpu)[vector];
+ if (IS_ERR_OR_NULL(desc))
continue;
- data = apic_chip_data(irq_get_irq_data(irq));
+ data = apic_chip_data(irq_desc_get_irq_data(desc));
if (!cpumask_test_cpu(cpu, data->domain))
- per_cpu(vector_irq, cpu)[vector] = VECTOR_UNDEFINED;
+ per_cpu(vector_irq, cpu)[vector] = VECTOR_UNUSED;
}
}
@@ -448,7 +449,7 @@
* legacy vector to irq mapping:
*/
for (irq = 0; irq < nr_legacy_irqs(); irq++)
- per_cpu(vector_irq, cpu)[ISA_IRQ_VECTOR(irq)] = irq;
+ per_cpu(vector_irq, cpu)[ISA_IRQ_VECTOR(irq)] = irq_to_desc(irq);
__setup_vector_irq(cpu);
}
@@ -490,7 +491,8 @@
if (err) {
struct irq_data *top = irq_get_irq_data(irq);
- if (assign_irq_vector(irq, data, top->affinity))
+ if (assign_irq_vector(irq, data,
+ irq_data_get_affinity_mask(top)))
pr_err("Failed to recover vector for irq %d\n", irq);
return err;
}
@@ -538,27 +540,30 @@
entering_ack_irq();
+ /* Prevent vectors vanishing under us */
+ raw_spin_lock(&vector_lock);
+
me = smp_processor_id();
for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
- int irq;
- unsigned int irr;
- struct irq_desc *desc;
struct apic_chip_data *data;
+ struct irq_desc *desc;
+ unsigned int irr;
- irq = __this_cpu_read(vector_irq[vector]);
-
- if (irq <= VECTOR_UNDEFINED)
+ retry:
+ desc = __this_cpu_read(vector_irq[vector]);
+ if (IS_ERR_OR_NULL(desc))
continue;
- desc = irq_to_desc(irq);
- if (!desc)
- continue;
+ if (!raw_spin_trylock(&desc->lock)) {
+ raw_spin_unlock(&vector_lock);
+ cpu_relax();
+ raw_spin_lock(&vector_lock);
+ goto retry;
+ }
- data = apic_chip_data(&desc->irq_data);
+ data = apic_chip_data(irq_desc_get_irq_data(desc));
if (!data)
- continue;
-
- raw_spin_lock(&desc->lock);
+ goto unlock;
/*
* Check if the irq migration is in progress. If so, we
@@ -583,11 +588,13 @@
apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
goto unlock;
}
- __this_cpu_write(vector_irq[vector], VECTOR_UNDEFINED);
+ __this_cpu_write(vector_irq[vector], VECTOR_UNUSED);
unlock:
raw_spin_unlock(&desc->lock);
}
+ raw_spin_unlock(&vector_lock);
+
exiting_irq();
}