irq_radix_revmap() currently serves 2 purposes, irq mapping lookup
and insertion which happen in interrupt and process context respectively.
Separate the function into its 2 components, one for lookup only and one
for insertion only.
Signed-off-by: Sebastien Dugue <sebastien.dugue@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
---
arch/powerpc/kernel/irq.c | 25 ++++++++++++++-----------
arch/powerpc/platforms/pseries/xics.c | 11 ++++-------
include/asm-powerpc/irq.h | 18 +++++++++++++++---
3 files changed, 33 insertions(+), 21 deletions(-)
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 0a1445c..083b181 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -900,34 +900,37 @@ void __init irq_radix_revmap_init(void)
}
}
-unsigned int irq_radix_revmap(struct irq_host *host,
- irq_hw_number_t hwirq)
+unsigned int irq_radix_revmap_lookup(struct irq_host *host,
+ irq_hw_number_t hwirq)
{
struct irq_map_entry *ptr;
- unsigned int virq;
+ unsigned int virq = NO_IRQ;
unsigned long flags;
WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
- /* Try to resolve */
irq_radix_rdlock(&flags);
ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq);
irq_radix_rdunlock(flags);
- /* Found it, return */
- if (ptr) {
+ if (ptr)
virq = ptr - irq_map;
- return virq;
- }
- /* If not there, try to insert it */
- virq = irq_find_mapping(host, hwirq);
+ return virq;
+}
+
+void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
+ irq_hw_number_t hwirq)
+{
+ unsigned long flags;
+
+ WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE);
+
if (virq != NO_IRQ) {
irq_radix_wrlock(&flags);
radix_tree_insert(&host->revmap_data.tree, hwirq, &irq_map[virq]);
irq_radix_wrunlock(flags);
}
- return virq;
}
unsigned int irq_linear_revmap(struct irq_host *host,
diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index 0fc830f..6b1a005 100644
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -310,12 +310,6 @@ static void xics_mask_irq(unsigned int virq)
static unsigned int xics_startup(unsigned int virq)
{
- unsigned int irq;
-
- /* force a reverse mapping of the interrupt so it gets in the cache */
- irq = (unsigned int)irq_map[virq].hwirq;
- irq_radix_revmap(xics_host, irq);
-
/* unmask it */
xics_unmask_irq(virq);
return 0;
@@ -346,7 +340,7 @@ static inline unsigned int xics_remap_irq(unsigned int vec)
if (vec == XICS_IRQ_SPURIOUS)
return NO_IRQ;
- irq = irq_radix_revmap(xics_host, vec);
+ irq = irq_radix_revmap_lookup(xics_host, vec);
if (likely(irq != NO_IRQ))
return irq;
@@ -530,6 +524,9 @@ static int xics_host_map(struct irq_host *h, unsigned int virq,
{
pr_debug("xics: map virq %d, hwirq 0x%lx\n", virq, hw);
+ /* Insert the interrupt mapping into the radix tree for fast lookup */
+ irq_radix_revmap_insert(xics_host, virq, hw);
+
get_irq_desc(virq)->status |= IRQ_LEVEL;
set_irq_chip_and_handler(virq, xics_irq_chip, handle_fasteoi_irq);
return 0;
diff --git a/include/asm-powerpc/irq.h b/include/asm-powerpc/irq.h
index 47b8119..5c88acf 100644
--- a/include/asm-powerpc/irq.h
+++ b/include/asm-powerpc/irq.h
@@ -243,15 +243,27 @@ extern unsigned int irq_create_direct_mapping(struct irq_host *host);
extern void __init irq_radix_revmap_init(void);
/**
- * irq_radix_revmap - Find a linux virq from a hw irq number.
+ * irq_radix_revmap_insert - Insert a hw irq to linux virq number mapping.
+ * @host: host owning this hardware interrupt
+ * @virq: linux irq number
+ * @hwirq: hardware irq number in that host space
+ *
+ * This is for use by irq controllers that use a radix tree reverse
+ * mapping for fast lookup.
+ */
+extern void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq,
+ irq_hw_number_t hwirq);
+
+/**
+ * irq_radix_revmap_lookup - Find a linux virq from a hw irq number.
* @host: host owning this hardware interrupt
* @hwirq: hardware irq number in that host space
*
* This is a fast path, for use by irq controller code that uses radix tree
* revmaps
*/
-extern unsigned int irq_radix_revmap(struct irq_host *host,
- irq_hw_number_t hwirq);
+extern unsigned int irq_radix_revmap_lookup(struct irq_host *host,
+ irq_hw_number_t hwirq);
/**
* irq_linear_revmap - Find a linux virq from a hw irq number.
--
1.5.5.1
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