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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@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1402302011-23642-38-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu 2014-06-09 16:20:06 +08:00 committed by Thomas Gleixner
parent 16ee7b3dcc
commit df334bead7
2 changed files with 64 additions and 0 deletions
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3
arch/x86/include/asm/io_apic.h
View File

@ -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)
{

61
arch/x86/kernel/apic/io_apic.c
View File

@ -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;