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sh: intc: optimize intc IRQ lookup
This ensures that the sense/prio lists are sorted at registration time, enabling us to use a simple binary search for an optimized lookup (something that had been on the TODO for some time). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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parent
3037764213
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drivers/sh/intc
@ -2,13 +2,14 @@
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* IRQ chip definitions for INTC IRQs.
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*
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* Copyright (C) 2007, 2008 Magnus Damm
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* Copyright (C) 2009, 2010 Paul Mundt
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* Copyright (C) 2009 - 2012 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/cpumask.h>
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#include <linux/bsearch.h>
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#include <linux/io.h>
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#include "internals.h"
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@ -117,28 +118,12 @@ static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
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unsigned int nr_hp,
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unsigned int irq)
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{
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int i;
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struct intc_handle_int key;
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/*
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* this doesn't scale well, but...
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*
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* this function should only be used for cerain uncommon
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* operations such as intc_set_priority() and intc_set_type()
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* and in those rare cases performance doesn't matter that much.
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* keeping the memory footprint low is more important.
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*
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* one rather simple way to speed this up and still keep the
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* memory footprint down is to make sure the array is sorted
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* and then perform a bisect to lookup the irq.
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*/
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for (i = 0; i < nr_hp; i++) {
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if ((hp + i)->irq != irq)
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continue;
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key.irq = irq;
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key.handle = 0;
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return hp + i;
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}
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return NULL;
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return bsearch(&key, hp, nr_hp, sizeof(*hp), intc_handle_int_cmp);
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}
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int intc_set_priority(unsigned int irq, unsigned int prio)
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@ -2,7 +2,7 @@
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* Shared interrupt handling code for IPR and INTC2 types of IRQs.
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*
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* Copyright (C) 2007, 2008 Magnus Damm
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* Copyright (C) 2009, 2010 Paul Mundt
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* Copyright (C) 2009 - 2012 Paul Mundt
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*
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* Based on intc2.c and ipr.c
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*
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@ -31,6 +31,7 @@
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#include <linux/spinlock.h>
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#include <linux/radix-tree.h>
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#include <linux/export.h>
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#include <linux/sort.h>
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#include "internals.h"
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LIST_HEAD(intc_list);
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@ -267,6 +268,9 @@ int __init register_intc_controller(struct intc_desc *desc)
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k += save_reg(d, k, hw->prio_regs[i].set_reg, smp);
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k += save_reg(d, k, hw->prio_regs[i].clr_reg, smp);
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}
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sort(d->prio, hw->nr_prio_regs, sizeof(*d->prio),
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intc_handle_int_cmp, NULL);
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}
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if (hw->sense_regs) {
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@ -277,6 +281,9 @@ int __init register_intc_controller(struct intc_desc *desc)
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for (i = 0; i < hw->nr_sense_regs; i++)
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k += save_reg(d, k, hw->sense_regs[i].reg, 0);
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sort(d->sense, hw->nr_sense_regs, sizeof(*d->sense),
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intc_handle_int_cmp, NULL);
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}
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if (hw->subgroups)
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@ -108,6 +108,14 @@ static inline void activate_irq(int irq)
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#endif
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}
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static inline int intc_handle_int_cmp(const void *a, const void *b)
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{
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const struct intc_handle_int *_a = a;
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const struct intc_handle_int *_b = b;
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return _a->irq - _b->irq;
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}
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/* access.c */
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extern unsigned long
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(*intc_reg_fns[])(unsigned long addr, unsigned long h, unsigned long data);
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