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irqdomain: Eliminate dedicated radix lookup functions 

In preparation to remove the slow revmap path, eliminate the public
radix revmap lookup functions.  This simplifies the code and makes the
slowpath removal patch a lot simpler.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Grant Likely 2012-06-03 22:04:37 -07:00
parent 98aa468e04
commit d6b0d1f705
4 changed files with 3 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/sysdev/xics/icp-hv.c
View File

@ -111,7 +111,7 @@ static unsigned int icp_hv_get_irq(void)
if (vec == XICS_IRQ_SPURIOUS)
return NO_IRQ;
irq = irq_radix_revmap_lookup(xics_host, vec);
irq = irq_find_mapping(xics_host, vec);
if (likely(irq != NO_IRQ)) {
xics_push_cppr(vec);
return irq;

2
arch/powerpc/sysdev/xics/icp-native.c
View File

@ -119,7 +119,7 @@ static unsigned int icp_native_get_irq(void)
if (vec == XICS_IRQ_SPURIOUS)
return NO_IRQ;
irq = irq_radix_revmap_lookup(xics_host, vec);
irq = irq_find_mapping(xics_host, vec);
if (likely(irq != NO_IRQ)) {
xics_push_cppr(vec);
return irq;

4
include/linux/irqdomain.h
View File

@ -174,10 +174,6 @@ static inline int irq_create_identity_mapping(struct irq_domain *host,
return irq_create_strict_mappings(host, hwirq, hwirq, 1);
}
extern void irq_radix_revmap_insert(struct irq_domain *host, unsigned int virq,
irq_hw_number_t hwirq);
extern unsigned int irq_radix_revmap_lookup(struct irq_domain *host,
irq_hw_number_t hwirq);
extern unsigned int irq_linear_revmap(struct irq_domain *host,
irq_hw_number_t hwirq);

60
kernel/irq/irqdomain.c
View File

@ -450,7 +450,7 @@ int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
break;
case IRQ_DOMAIN_MAP_TREE:
mutex_lock(&revmap_trees_mutex);
irq_radix_revmap_insert(domain, virq, hwirq);
radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
mutex_unlock(&revmap_trees_mutex);
break;
}
@ -723,64 +723,6 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
/**
* irq_radix_revmap_lookup() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt
* @hwirq: hardware irq number in that domain space
*
* This is a fast path, for use by irq controller code that uses radix tree
* revmaps
*/
unsigned int irq_radix_revmap_lookup(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
struct irq_data *irq_data;
if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
return irq_find_mapping(domain, hwirq);
/*
* Freeing an irq can delete nodes along the path to
* do the lookup via call_rcu.
*/
rcu_read_lock();
irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
rcu_read_unlock();
/*
* If found in radix tree, then fine.
* Else fallback to linear lookup - this should not happen in practice
* as it means that we failed to insert the node in the radix tree.
*/
return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq);
}
EXPORT_SYMBOL_GPL(irq_radix_revmap_lookup);
/**
* irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
* @domain: domain owning this hardware interrupt
* @virq: linux irq number
* @hwirq: hardware irq number in that domain space
*
* This is for use by irq controllers that use a radix tree reverse
* mapping for fast lookup.
*/
void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
{
struct irq_data *irq_data = irq_get_irq_data(virq);
if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
return;
if (virq) {
mutex_lock(&revmap_trees_mutex);
radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
mutex_unlock(&revmap_trees_mutex);
}
}
EXPORT_SYMBOL_GPL(irq_radix_revmap_insert);
/**
* irq_linear_revmap() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt