x86/irq: Use hierarchical irqdomain to manage CPU interrupt vectors
Abstract CPU local APIC as an interrupt controller and create an
irqdomain for it to manage CPU interrupt vectors. It's the base to
enable hierarchical irqdomains on x86 systems.
The final irqdomain hierarchy will look like this:
IOAPIC domain ----|
MSI/MSI-x domain ----> [Interrupt Remapping domain] -> CPU vector domain
HPET_IRQ domain ----| ^
|
DMAR domain ----------------------------------------------|
HT_IRQ domain ----------------------------------------------|
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Cohen <david.a.cohen@linux.intel.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Cc: Grant Likely <grant.likely@linaro.org>
Link: http://lkml.kernel.org/r/1428905519-23704-3-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6049d58..e75a96c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -465,7 +465,6 @@
select X86_REBOOTFIXUPS
select OF
select OF_EARLY_FLATTREE
- select IRQ_DOMAIN
---help---
Select for the Intel CE media processor (CE4100) SOC.
This option compiles in support for the CE4100 SOC for settop
@@ -914,11 +913,11 @@
def_bool y
depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
+ select IRQ_DOMAIN_HIERARCHY
config X86_IO_APIC
def_bool y
depends on X86_LOCAL_APIC || X86_UP_IOAPIC
- select IRQ_DOMAIN
config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
bool "Reroute for broken boot IRQs"
diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index cda9695..5b951ac 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -112,6 +112,17 @@
#ifdef CONFIG_X86_LOCAL_APIC
struct irq_data;
+struct irq_domain;
+
+struct irq_alloc_info {
+ u32 flags;
+ const struct cpumask *mask; /* CPU mask for vector allocation */
+};
+
+enum {
+ /* Allocate contiguous CPU vectors */
+ X86_IRQ_ALLOC_CONTIGUOUS_VECTORS = 0x1,
+};
struct irq_cfg {
cpumask_var_t domain;
@@ -135,6 +146,12 @@
};
};
+extern struct irq_domain *x86_vector_domain;
+
+extern void init_irq_alloc_info(struct irq_alloc_info *info,
+ const struct cpumask *mask);
+extern void copy_irq_alloc_info(struct irq_alloc_info *dst,
+ struct irq_alloc_info *src);
extern struct irq_cfg *irq_cfg(unsigned int irq);
extern struct irq_cfg *irqd_cfg(struct irq_data *irq_data);
extern struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index f4dc246..56d5321 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2356,9 +2356,6 @@
ioapic_dynirq_base = max(ioapic_dynirq_base,
gsi_cfg->gsi_end + 1);
- if (gsi_cfg->gsi_base == 0)
- irq_set_default_host(ip->irqdomain);
-
return 0;
}
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index c724ef6..6358d8d 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -3,6 +3,8 @@
*
* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
* Moved from arch/x86/kernel/apic/io_apic.c.
+ * Jiang Liu <jiang.liu@linux.intel.com>
+ * Enable support of hierarchical irqdomains
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -19,7 +21,9 @@
#include <asm/desc.h>
#include <asm/irq_remapping.h>
+struct irq_domain *x86_vector_domain;
static DEFINE_RAW_SPINLOCK(vector_lock);
+static struct irq_chip lapic_controller;
void lock_vector_lock(void)
{
@@ -36,15 +40,21 @@
struct irq_cfg *irq_cfg(unsigned int irq)
{
- return irq_get_chip_data(irq);
+ return irqd_cfg(irq_get_irq_data(irq));
}
struct irq_cfg *irqd_cfg(struct irq_data *irq_data)
{
+ if (!irq_data)
+ return NULL;
+
+ while (irq_data->parent_data)
+ irq_data = irq_data->parent_data;
+
return irq_data->chip_data;
}
-static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
+static struct irq_cfg *alloc_irq_cfg(int node)
{
struct irq_cfg *cfg;
@@ -79,7 +89,7 @@
return cfg;
}
- cfg = alloc_irq_cfg(at, node);
+ cfg = alloc_irq_cfg(node);
if (cfg)
irq_set_chip_data(at, cfg);
else
@@ -87,14 +97,13 @@
return cfg;
}
-static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
+static void free_irq_cfg(struct irq_cfg *cfg)
{
- if (!cfg)
- return;
- irq_set_chip_data(at, NULL);
- free_cpumask_var(cfg->domain);
- free_cpumask_var(cfg->old_domain);
- kfree(cfg);
+ if (cfg) {
+ free_cpumask_var(cfg->domain);
+ free_cpumask_var(cfg->old_domain);
+ kfree(cfg);
+ }
}
static int
@@ -241,6 +250,90 @@
raw_spin_unlock_irqrestore(&vector_lock, flags);
}
+void init_irq_alloc_info(struct irq_alloc_info *info,
+ const struct cpumask *mask)
+{
+ memset(info, 0, sizeof(*info));
+ info->mask = mask;
+}
+
+void copy_irq_alloc_info(struct irq_alloc_info *dst, struct irq_alloc_info *src)
+{
+ if (src)
+ *dst = *src;
+ else
+ memset(dst, 0, sizeof(*dst));
+}
+
+static inline const struct cpumask *
+irq_alloc_info_get_mask(struct irq_alloc_info *info)
+{
+ return (!info || !info->mask) ? apic->target_cpus() : info->mask;
+}
+
+static void x86_vector_free_irqs(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs)
+{
+ struct irq_data *irq_data;
+ int i;
+
+ for (i = 0; i < nr_irqs; i++) {
+ irq_data = irq_domain_get_irq_data(x86_vector_domain, virq + i);
+ if (irq_data && irq_data->chip_data) {
+ free_remapped_irq(virq);
+ clear_irq_vector(virq + i, irq_data->chip_data);
+ free_irq_cfg(irq_data->chip_data);
+ irq_domain_reset_irq_data(irq_data);
+ }
+ }
+}
+
+static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *arg)
+{
+ struct irq_alloc_info *info = arg;
+ const struct cpumask *mask;
+ struct irq_data *irq_data;
+ struct irq_cfg *cfg;
+ int i, err;
+
+ if (disable_apic)
+ return -ENXIO;
+
+ /* Currently vector allocator can't guarantee contiguous allocations */
+ if ((info->flags & X86_IRQ_ALLOC_CONTIGUOUS_VECTORS) && nr_irqs > 1)
+ return -ENOSYS;
+
+ mask = irq_alloc_info_get_mask(info);
+ for (i = 0; i < nr_irqs; i++) {
+ irq_data = irq_domain_get_irq_data(domain, virq + i);
+ BUG_ON(!irq_data);
+ cfg = alloc_irq_cfg(irq_data->node);
+ if (!cfg) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ irq_data->chip = &lapic_controller;
+ irq_data->chip_data = cfg;
+ irq_data->hwirq = virq + i;
+ err = assign_irq_vector(virq, cfg, mask);
+ if (err)
+ goto error;
+ }
+
+ return 0;
+
+error:
+ x86_vector_free_irqs(domain, virq, i + 1);
+ return err;
+}
+
+static struct irq_domain_ops x86_vector_domain_ops = {
+ .alloc = x86_vector_alloc_irqs,
+ .free = x86_vector_free_irqs,
+};
+
int __init arch_probe_nr_irqs(void)
{
int nr;
@@ -266,6 +359,11 @@
int __init arch_early_irq_init(void)
{
+ x86_vector_domain = irq_domain_add_tree(NULL, &x86_vector_domain_ops,
+ NULL);
+ BUG_ON(x86_vector_domain == NULL);
+ irq_set_default_host(x86_vector_domain);
+
return arch_early_ioapic_init();
}
@@ -380,6 +478,36 @@
return 0;
}
+static int vector_set_affinity(struct irq_data *irq_data,
+ const struct cpumask *dest, bool force)
+{
+ struct irq_cfg *cfg = irq_data->chip_data;
+ int err, irq = irq_data->irq;
+
+ if (!config_enabled(CONFIG_SMP))
+ return -EPERM;
+
+ if (!cpumask_intersects(dest, cpu_online_mask))
+ return -EINVAL;
+
+ err = assign_irq_vector(irq, cfg, dest);
+ if (err) {
+ struct irq_data *top = irq_get_irq_data(irq);
+
+ if (assign_irq_vector(irq, cfg, top->affinity))
+ pr_err("Failed to recover vector for irq %d\n", irq);
+ return err;
+ }
+
+ return IRQ_SET_MASK_OK;
+}
+
+static struct irq_chip lapic_controller = {
+ .irq_ack = apic_ack_edge,
+ .irq_set_affinity = vector_set_affinity,
+ .irq_retrigger = apic_retrigger_irq,
+};
+
#ifdef CONFIG_SMP
void send_cleanup_vector(struct irq_cfg *cfg)
{
@@ -497,7 +625,7 @@
unsigned long flags;
int ret;
- cfg = alloc_irq_cfg(irq, node);
+ cfg = alloc_irq_cfg(node);
if (!cfg)
return -ENOMEM;
@@ -508,7 +636,7 @@
if (!ret)
irq_set_chip_data(irq, cfg);
else
- free_irq_cfg(irq, cfg);
+ free_irq_cfg(cfg);
return ret;
}
@@ -518,7 +646,8 @@
free_remapped_irq(irq);
clear_irq_vector(irq, cfg);
- free_irq_cfg(irq, cfg);
+ irq_set_chip_data(irq, NULL);
+ free_irq_cfg(cfg);
}
static void __init print_APIC_field(int base)