linux-stable/drivers/sh/intc/virq.c
Thomas Gleixner bd0b9ac405 genirq: Remove irq argument from irq flow handlers
Most interrupt flow handlers do not use the irq argument. Those few
which use it can retrieve the irq number from the irq descriptor.

Remove the argument.

Search and replace was done with coccinelle and some extra helper
scripts around it. Thanks to Julia for her help!

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
2015-09-16 15:47:51 +02:00

271 lines
6.3 KiB
C

/*
* Support for virtual IRQ subgroups.
*
* Copyright (C) 2010 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define pr_fmt(fmt) "intc: " fmt
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/list.h>
#include <linux/radix-tree.h>
#include <linux/spinlock.h>
#include <linux/export.h>
#include "internals.h"
static struct intc_map_entry intc_irq_xlate[INTC_NR_IRQS];
struct intc_virq_list {
unsigned int irq;
struct intc_virq_list *next;
};
#define for_each_virq(entry, head) \
for (entry = head; entry; entry = entry->next)
/*
* Tags for the radix tree
*/
#define INTC_TAG_VIRQ_NEEDS_ALLOC 0
void intc_irq_xlate_set(unsigned int irq, intc_enum id, struct intc_desc_int *d)
{
unsigned long flags;
raw_spin_lock_irqsave(&intc_big_lock, flags);
intc_irq_xlate[irq].enum_id = id;
intc_irq_xlate[irq].desc = d;
raw_spin_unlock_irqrestore(&intc_big_lock, flags);
}
struct intc_map_entry *intc_irq_xlate_get(unsigned int irq)
{
return intc_irq_xlate + irq;
}
int intc_irq_lookup(const char *chipname, intc_enum enum_id)
{
struct intc_map_entry *ptr;
struct intc_desc_int *d;
int irq = -1;
list_for_each_entry(d, &intc_list, list) {
int tagged;
if (strcmp(d->chip.name, chipname) != 0)
continue;
/*
* Catch early lookups for subgroup VIRQs that have not
* yet been allocated an IRQ. This already includes a
* fast-path out if the tree is untagged, so there is no
* need to explicitly test the root tree.
*/
tagged = radix_tree_tag_get(&d->tree, enum_id,
INTC_TAG_VIRQ_NEEDS_ALLOC);
if (unlikely(tagged))
break;
ptr = radix_tree_lookup(&d->tree, enum_id);
if (ptr) {
irq = ptr - intc_irq_xlate;
break;
}
}
return irq;
}
EXPORT_SYMBOL_GPL(intc_irq_lookup);
static int add_virq_to_pirq(unsigned int irq, unsigned int virq)
{
struct intc_virq_list *entry;
struct intc_virq_list **last = NULL;
/* scan for duplicates */
for_each_virq(entry, irq_get_handler_data(irq)) {
if (entry->irq == virq)
return 0;
last = &entry->next;
}
entry = kzalloc(sizeof(struct intc_virq_list), GFP_ATOMIC);
if (!entry) {
pr_err("can't allocate VIRQ mapping for %d\n", virq);
return -ENOMEM;
}
entry->irq = virq;
if (last)
*last = entry;
else
irq_set_handler_data(irq, entry);
return 0;
}
static void intc_virq_handler(struct irq_desc *desc)
{
unsigned int irq = irq_desc_get_irq(desc);
struct irq_data *data = irq_desc_get_irq_data(desc);
struct irq_chip *chip = irq_data_get_irq_chip(data);
struct intc_virq_list *entry, *vlist = irq_data_get_irq_handler_data(data);
struct intc_desc_int *d = get_intc_desc(irq);
chip->irq_mask_ack(data);
for_each_virq(entry, vlist) {
unsigned long addr, handle;
struct irq_desc *vdesc = irq_to_desc(entry->irq);
if (vdesc) {
handle = (unsigned long)irq_desc_get_handler_data(vdesc);
addr = INTC_REG(d, _INTC_ADDR_E(handle), 0);
if (intc_reg_fns[_INTC_FN(handle)](addr, handle, 0))
generic_handle_irq_desc(vdesc);
}
}
chip->irq_unmask(data);
}
static unsigned long __init intc_subgroup_data(struct intc_subgroup *subgroup,
struct intc_desc_int *d,
unsigned int index)
{
unsigned int fn = REG_FN_TEST_BASE + (subgroup->reg_width >> 3) - 1;
return _INTC_MK(fn, MODE_ENABLE_REG, intc_get_reg(d, subgroup->reg),
0, 1, (subgroup->reg_width - 1) - index);
}
static void __init intc_subgroup_init_one(struct intc_desc *desc,
struct intc_desc_int *d,
struct intc_subgroup *subgroup)
{
struct intc_map_entry *mapped;
unsigned int pirq;
unsigned long flags;
int i;
mapped = radix_tree_lookup(&d->tree, subgroup->parent_id);
if (!mapped) {
WARN_ON(1);
return;
}
pirq = mapped - intc_irq_xlate;
raw_spin_lock_irqsave(&d->lock, flags);
for (i = 0; i < ARRAY_SIZE(subgroup->enum_ids); i++) {
struct intc_subgroup_entry *entry;
int err;
if (!subgroup->enum_ids[i])
continue;
entry = kmalloc(sizeof(*entry), GFP_NOWAIT);
if (!entry)
break;
entry->pirq = pirq;
entry->enum_id = subgroup->enum_ids[i];
entry->handle = intc_subgroup_data(subgroup, d, i);
err = radix_tree_insert(&d->tree, entry->enum_id, entry);
if (unlikely(err < 0))
break;
radix_tree_tag_set(&d->tree, entry->enum_id,
INTC_TAG_VIRQ_NEEDS_ALLOC);
}
raw_spin_unlock_irqrestore(&d->lock, flags);
}
void __init intc_subgroup_init(struct intc_desc *desc, struct intc_desc_int *d)
{
int i;
if (!desc->hw.subgroups)
return;
for (i = 0; i < desc->hw.nr_subgroups; i++)
intc_subgroup_init_one(desc, d, desc->hw.subgroups + i);
}
static void __init intc_subgroup_map(struct intc_desc_int *d)
{
struct intc_subgroup_entry *entries[32];
unsigned long flags;
unsigned int nr_found;
int i;
raw_spin_lock_irqsave(&d->lock, flags);
restart:
nr_found = radix_tree_gang_lookup_tag_slot(&d->tree,
(void ***)entries, 0, ARRAY_SIZE(entries),
INTC_TAG_VIRQ_NEEDS_ALLOC);
for (i = 0; i < nr_found; i++) {
struct intc_subgroup_entry *entry;
int irq;
entry = radix_tree_deref_slot((void **)entries[i]);
if (unlikely(!entry))
continue;
if (radix_tree_deref_retry(entry))
goto restart;
irq = irq_alloc_desc(numa_node_id());
if (unlikely(irq < 0)) {
pr_err("no more free IRQs, bailing..\n");
break;
}
activate_irq(irq);
pr_info("Setting up a chained VIRQ from %d -> %d\n",
irq, entry->pirq);
intc_irq_xlate_set(irq, entry->enum_id, d);
irq_set_chip_and_handler_name(irq, irq_get_chip(entry->pirq),
handle_simple_irq, "virq");
irq_set_chip_data(irq, irq_get_chip_data(entry->pirq));
irq_set_handler_data(irq, (void *)entry->handle);
/*
* Set the virtual IRQ as non-threadable.
*/
irq_set_nothread(irq);
/* Set handler data before installing the handler */
add_virq_to_pirq(entry->pirq, irq);
irq_set_chained_handler(entry->pirq, intc_virq_handler);
radix_tree_tag_clear(&d->tree, entry->enum_id,
INTC_TAG_VIRQ_NEEDS_ALLOC);
radix_tree_replace_slot((void **)entries[i],
&intc_irq_xlate[irq]);
}
raw_spin_unlock_irqrestore(&d->lock, flags);
}
void __init intc_finalize(void)
{
struct intc_desc_int *d;
list_for_each_entry(d, &intc_list, list)
if (radix_tree_tagged(&d->tree, INTC_TAG_VIRQ_NEEDS_ALLOC))
intc_subgroup_map(d);
}