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irqdomain: Implement a method to automatically call parent domains alloc/free 

Add a flags to irq_domain.flags to control whether the irqdomain core
should automatically call parent irqdomain's alloc/free callbacks. It
help to reduce hierarchy irqdomains users' code size.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Link: http://lkml.kernel.org/r/1416061447-9472-4-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu 2014-11-15 22:24:01 +08:00 committed by Thomas Gleixner
parent 1b5377087c
commit 36d727310c
2 changed files with 89 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
include/linux/irqdomain.h
View File

@ -134,6 +134,9 @@ enum {
/* Irq domain is hierarchical */
IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0),
/* Core calls alloc/free recursive through the domain hierarchy. */
IRQ_DOMAIN_FLAG_AUTO_RECURSIVE = (1 << 1),
/*
* Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
* for implementation specific purposes and ignored by the
@ -285,22 +288,13 @@ extern void irq_domain_free_irqs_common(struct irq_domain *domain,
extern void irq_domain_free_irqs_top(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs);
static inline int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs, void *arg)
{
if (domain->parent && domain->parent->ops->alloc)
return domain->parent->ops->alloc(domain->parent, irq_base,
nr_irqs, arg);
return -ENOSYS;
}
unsigned int nr_irqs, void *arg);
static inline void irq_domain_free_irqs_parent(struct irq_domain *domain,
unsigned int irq_base, unsigned int nr_irqs)
{
if (domain->parent && domain->parent->ops->free)
domain->parent->ops->free(domain->parent, irq_base, nr_irqs);
}
extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs);
static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
{

82
kernel/irq/irqdomain.c
View File

@ -960,6 +960,43 @@ void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq,
irq_domain_free_irqs_common(domain, virq, nr_irqs);
}
static bool irq_domain_is_auto_recursive(struct irq_domain *domain)
{
return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE;
}
static void irq_domain_free_irqs_recursive(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs)
{
domain->ops->free(domain, irq_base, nr_irqs);
if (irq_domain_is_auto_recursive(domain)) {
BUG_ON(!domain->parent);
irq_domain_free_irqs_recursive(domain->parent, irq_base,
nr_irqs);
}
}
static int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs, void *arg)
{
int ret = 0;
struct irq_domain *parent = domain->parent;
bool recursive = irq_domain_is_auto_recursive(domain);
BUG_ON(recursive && !parent);
if (recursive)
ret = irq_domain_alloc_irqs_recursive(parent, irq_base,
nr_irqs, arg);
if (ret >= 0)
ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg);
if (ret < 0 && recursive)
irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs);
return ret;
}
/**
* __irq_domain_alloc_irqs - Allocate IRQs from domain
* @domain: domain to allocate from
@ -1016,7 +1053,7 @@ int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
}
mutex_lock(&irq_domain_mutex);
ret = domain->ops->alloc(domain, virq, nr_irqs, arg);
ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg);
if (ret < 0) {
mutex_unlock(&irq_domain_mutex);
goto out_free_irq_data;
@ -1051,13 +1088,54 @@ void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs)
mutex_lock(&irq_domain_mutex);
for (i = 0; i < nr_irqs; i++)
irq_domain_remove_irq(virq + i);
data->domain->ops->free(data->domain, virq, nr_irqs);
irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs);
mutex_unlock(&irq_domain_mutex);
irq_domain_free_irq_data(virq, nr_irqs);
irq_free_descs(virq, nr_irqs);
}
/**
* irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain
* @irq_base: Base IRQ number
* @nr_irqs: Number of IRQs to allocate
* @arg: Allocation data (arch/domain specific)
*
* Check whether the domain has been setup recursive. If not allocate
* through the parent domain.
*/
int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
unsigned int irq_base, unsigned int nr_irqs,
void *arg)
{
/* irq_domain_alloc_irqs_recursive() has called parent's alloc() */
if (irq_domain_is_auto_recursive(domain))
return 0;
domain = domain->parent;
if (domain)
return irq_domain_alloc_irqs_recursive(domain, irq_base,
nr_irqs, arg);
return -ENOSYS;
}
/**
* irq_domain_free_irqs_parent - Free interrupts from parent domain
* @irq_base: Base IRQ number
* @nr_irqs: Number of IRQs to free
*
* Check whether the domain has been setup recursive. If not free
* through the parent domain.
*/
void irq_domain_free_irqs_parent(struct irq_domain *domain,
unsigned int irq_base, unsigned int nr_irqs)
{
/* irq_domain_free_irqs_recursive() will call parent's free */
if (!irq_domain_is_auto_recursive(domain) && domain->parent)
irq_domain_free_irqs_recursive(domain->parent, irq_base,
nr_irqs);
}
/**
* irq_domain_activate_irq - Call domain_ops->activate recursively to activate
* interrupt