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Date: Sat, 21 Jun 2014 14:17:10 -0700
From: tip-bot for Jiang Liu <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: mingo@...nel.org, konrad.wilk@...cle.com, rdunlap@...radead.org,
tony.luck@...el.com, gregkh@...uxfoundation.org,
tglx@...utronix.de, hpa@...or.com, jiang.liu@...ux.intel.com,
grant.likely@...aro.org, linux-kernel@...r.kernel.org,
yinghai@...nel.org, joro@...tes.org, benh@...nel.crashing.org,
bhelgaas@...gle.com, rjw@...ysocki.net,
paul.gortmaker@...driver.com
Subject: [tip:x86/apic] x86, irq:
Introduce helper functions to release IOAPIC pin
Commit-ID: df334bead7e94772c41745af9f329383067d44ae
Gitweb: http://git.kernel.org/tip/df334bead7e94772c41745af9f329383067d44ae
Author: Jiang Liu <jiang.liu@...ux.intel.com>
AuthorDate: Mon, 9 Jun 2014 16:20:06 +0800
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sat, 21 Jun 2014 23:05:44 +0200
x86, irq: Introduce helper functions to release IOAPIC pin
Introduce function mp_unmap_irq() to release IOAPIC IRQ when IRQ is not
used any more, which will typically called by pcibios_disabled_irq.
And function mp_irqdomain_unmap() is a common implementation of
irq_domain_ops.unmap for IOAPIC.
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Grant Likely <grant.likely@...aro.org>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Link: http://lkml.kernel.org/r/1402302011-23642-38-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
arch/x86/include/asm/io_apic.h | 3 +++
arch/x86/kernel/apic/io_apic.c | 61 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 64 insertions(+)
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index af6f9d4..0aeed5c 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -187,10 +187,12 @@ extern int mp_find_ioapic(u32 gsi);
extern int mp_find_ioapic_pin(int ioapic, u32 gsi);
extern u32 mp_pin_to_gsi(int ioapic, int pin);
extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags);
+extern void mp_unmap_irq(int irq);
extern void __init mp_register_ioapic(int id, u32 address, u32 gsi_base,
struct ioapic_domain_cfg *cfg);
extern int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq);
+extern void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq);
extern int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node);
extern void __init pre_init_apic_IRQ0(void);
@@ -234,6 +236,7 @@ static inline void ioapic_insert_resources(void) { }
static inline int mp_find_ioapic(u32 gsi) { return 0; }
static inline u32 mp_pin_to_gsi(int ioapic, int pin) { return UINT_MAX; }
static inline int mp_map_gsi_to_irq(u32 gsi, unsigned int flags) { return gsi; }
+static inline void mp_unmap_irq(int irq) { }
static inline int save_ioapic_entries(void)
{
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 8485d90..8d80a8f 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -467,6 +467,21 @@ static int __add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pi
return 0;
}
+static void __remove_pin_from_irq(struct irq_cfg *cfg, int apic, int pin)
+{
+ struct irq_pin_list **last, *entry;
+
+ last = &cfg->irq_2_pin;
+ for_each_irq_pin(entry, cfg->irq_2_pin)
+ if (entry->apic == apic && entry->pin == pin) {
+ *last = entry->next;
+ kfree(entry);
+ return;
+ } else {
+ last = &entry->next;
+ }
+}
+
static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
{
if (__add_pin_to_irq_node(cfg, node, apic, pin))
@@ -1119,6 +1134,31 @@ int mp_map_gsi_to_irq(u32 gsi, unsigned int flags)
return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags);
}
+void mp_unmap_irq(int irq)
+{
+ struct irq_data *data = irq_get_irq_data(irq);
+ struct mp_pin_info *info;
+ int ioapic, pin;
+
+ if (!data || !data->domain)
+ return;
+
+ ioapic = (int)(long)data->domain->host_data;
+ pin = (int)data->hwirq;
+ info = mp_pin_info(ioapic, pin);
+
+ mutex_lock(&ioapic_mutex);
+ if (--info->count == 0) {
+ info->set = 0;
+ if (irq < nr_legacy_irqs() &&
+ ioapics[ioapic].irqdomain_cfg.type == IOAPIC_DOMAIN_LEGACY)
+ mp_irqdomain_unmap(data->domain, irq);
+ else
+ irq_dispose_mapping(irq);
+ }
+ mutex_unlock(&ioapic_mutex);
+}
+
/*
* Find a specific PCI IRQ entry.
* Not an __init, possibly needed by modules
@@ -3878,6 +3918,27 @@ int mp_irqdomain_map(struct irq_domain *domain, unsigned int virq,
return io_apic_setup_irq_pin(virq, info->node, &attr);
}
+void mp_irqdomain_unmap(struct irq_domain *domain, unsigned int virq)
+{
+ struct irq_data *data = irq_get_irq_data(virq);
+ struct irq_cfg *cfg = irq_cfg(virq);
+ int ioapic = (int)(long)domain->host_data;
+ int pin = (int)data->hwirq;
+
+ /*
+ * Skip the timer IRQ if there's a quirk handler installed and if it
+ * returns 1:
+ */
+ if (apic->multi_timer_check &&
+ apic->multi_timer_check(ioapic, virq))
+ return;
+
+ ioapic_mask_entry(ioapic, pin);
+ __remove_pin_from_irq(cfg, ioapic, pin);
+ WARN_ON(cfg->irq_2_pin != NULL);
+ arch_teardown_hwirq(virq);
+}
+
int mp_set_gsi_attr(u32 gsi, int trigger, int polarity, int node)
{
int ret = 0;
--
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