Cache the per irq bit mask instead of recalculating it over and over.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/irq.h | 4 ++++
kernel/irq/generic-chip.c | 23 ++++++++++++++---------
2 files changed, 18 insertions(+), 9 deletions(-)
Index: linux-2.6/include/linux/irq.h
===================================================================
--- linux-2.6.orig/include/linux/irq.h
+++ linux-2.6/include/linux/irq.h
@@ -119,6 +119,7 @@ struct irq_domain;
/**
* struct irq_data - per irq and irq chip data passed down to chip functions
+ * @mask: precomputed bitmask for accessing the chip registers
* @irq: interrupt number
* @hwirq: hardware interrupt number, local to the interrupt domain
* @node: node index useful for balancing
@@ -138,6 +139,7 @@ struct irq_domain;
* irq_data.
*/
struct irq_data {
+ u32 mask;
unsigned int irq;
unsigned long hwirq;
unsigned int node;
@@ -705,11 +707,13 @@ struct irq_chip_generic {
* irq chips which need to call irq_set_wake() on
* the parent irq. Usually GPIO implementations
* @IRQ_GC_MASK_CACHE_PER_TYPE: Mask cache is chip type private
+ * @IRQ_GC_NO_MASK: Do not calculate irq_data->mask
*/
enum irq_gc_flags {
IRQ_GC_INIT_MASK_CACHE = 1 << 0,
IRQ_GC_INIT_NESTED_LOCK = 1 << 1,
IRQ_GC_MASK_CACHE_PER_TYPE = 1 << 2,
+ IRQ_GC_NO_MASK = 1 << 3,
};
/* Generic chip callback functions */
Index: linux-2.6/kernel/irq/generic-chip.c
===================================================================
--- linux-2.6.orig/kernel/irq/generic-chip.c
+++ linux-2.6/kernel/irq/generic-chip.c
@@ -35,7 +35,7 @@ void irq_gc_mask_disable_reg(struct irq_
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + ct->regs.disable);
@@ -54,7 +54,7 @@ void irq_gc_mask_set_bit(struct irq_data
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
irq_gc_lock(gc);
*ct->mask_cache |= mask;
@@ -73,7 +73,7 @@ void irq_gc_mask_clr_bit(struct irq_data
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
irq_gc_lock(gc);
*ct->mask_cache &= ~mask;
@@ -92,7 +92,7 @@ void irq_gc_unmask_enable_reg(struct irq
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + ct->regs.enable);
@@ -108,7 +108,7 @@ void irq_gc_ack_set_bit(struct irq_data
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + ct->regs.ack);
@@ -123,7 +123,7 @@ void irq_gc_ack_clr_bit(struct irq_data
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = ~(1 << (d->irq - gc->irq_base));
+ u32 mask = ~d->mask;
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + ct->regs.ack);
@@ -138,7 +138,7 @@ void irq_gc_mask_disable_reg_and_ack(str
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + ct->regs.mask);
@@ -154,7 +154,7 @@ void irq_gc_eoi(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = irq_data_get_chip_type(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + ct->regs.eoi);
@@ -172,7 +172,7 @@ void irq_gc_eoi(struct irq_data *d)
int irq_gc_set_wake(struct irq_data *d, unsigned int on)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = d->mask;
if (!(mask & gc->wake_enabled))
return -EINVAL;
@@ -264,6 +264,11 @@ void irq_setup_generic_chip(struct irq_c
if (flags & IRQ_GC_INIT_NESTED_LOCK)
irq_set_lockdep_class(i, &irq_nested_lock_class);
+ if (!(flags & IRQ_GC_NO_MASK)) {
+ struct irq_data *d = irq_get_irq_data(i);
+
+ d->mask = 1 << (i - gc->irq_base);
+ }
irq_set_chip_and_handler(i, &ct->chip, ct->handler);
irq_set_chip_data(i, gc);
irq_modify_status(i, clr, set);
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
