mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-14 07:36:43 +07:00
4b1b366721
From: Evgeniy Polyakov <johnpol@2ka.mipt.ru> We don't need one cqueue thread for each CPU. cqueue is used for receiving userspace datagrams, which are very rare and thus will happily live with a single queue. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
179 lines
4.2 KiB
C
179 lines
4.2 KiB
C
/*
|
|
* cn_queue.c
|
|
*
|
|
* 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/list.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/connector.h>
|
|
#include <linux/delay.h>
|
|
|
|
void cn_queue_wrapper(struct work_struct *work)
|
|
{
|
|
struct cn_callback_entry *cbq =
|
|
container_of(work, struct cn_callback_entry, work);
|
|
struct cn_callback_data *d = &cbq->data;
|
|
|
|
d->callback(d->callback_priv);
|
|
|
|
d->destruct_data(d->ddata);
|
|
d->ddata = NULL;
|
|
|
|
kfree(d->free);
|
|
}
|
|
|
|
static struct cn_callback_entry *cn_queue_alloc_callback_entry(char *name, struct cb_id *id, void (*callback)(void *))
|
|
{
|
|
struct cn_callback_entry *cbq;
|
|
|
|
cbq = kzalloc(sizeof(*cbq), GFP_KERNEL);
|
|
if (!cbq) {
|
|
printk(KERN_ERR "Failed to create new callback queue.\n");
|
|
return NULL;
|
|
}
|
|
|
|
snprintf(cbq->id.name, sizeof(cbq->id.name), "%s", name);
|
|
memcpy(&cbq->id.id, id, sizeof(struct cb_id));
|
|
cbq->data.callback = callback;
|
|
|
|
INIT_WORK(&cbq->work, &cn_queue_wrapper);
|
|
return cbq;
|
|
}
|
|
|
|
static void cn_queue_free_callback(struct cn_callback_entry *cbq)
|
|
{
|
|
flush_workqueue(cbq->pdev->cn_queue);
|
|
|
|
kfree(cbq);
|
|
}
|
|
|
|
int cn_cb_equal(struct cb_id *i1, struct cb_id *i2)
|
|
{
|
|
return ((i1->idx == i2->idx) && (i1->val == i2->val));
|
|
}
|
|
|
|
int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *))
|
|
{
|
|
struct cn_callback_entry *cbq, *__cbq;
|
|
int found = 0;
|
|
|
|
cbq = cn_queue_alloc_callback_entry(name, id, callback);
|
|
if (!cbq)
|
|
return -ENOMEM;
|
|
|
|
atomic_inc(&dev->refcnt);
|
|
cbq->pdev = dev;
|
|
|
|
spin_lock_bh(&dev->queue_lock);
|
|
list_for_each_entry(__cbq, &dev->queue_list, callback_entry) {
|
|
if (cn_cb_equal(&__cbq->id.id, id)) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
list_add_tail(&cbq->callback_entry, &dev->queue_list);
|
|
spin_unlock_bh(&dev->queue_lock);
|
|
|
|
if (found) {
|
|
cn_queue_free_callback(cbq);
|
|
atomic_dec(&dev->refcnt);
|
|
return -EINVAL;
|
|
}
|
|
|
|
cbq->seq = 0;
|
|
cbq->group = cbq->id.id.idx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id)
|
|
{
|
|
struct cn_callback_entry *cbq, *n;
|
|
int found = 0;
|
|
|
|
spin_lock_bh(&dev->queue_lock);
|
|
list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) {
|
|
if (cn_cb_equal(&cbq->id.id, id)) {
|
|
list_del(&cbq->callback_entry);
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&dev->queue_lock);
|
|
|
|
if (found) {
|
|
cn_queue_free_callback(cbq);
|
|
atomic_dec(&dev->refcnt);
|
|
}
|
|
}
|
|
|
|
struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *nls)
|
|
{
|
|
struct cn_queue_dev *dev;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
snprintf(dev->name, sizeof(dev->name), "%s", name);
|
|
atomic_set(&dev->refcnt, 0);
|
|
INIT_LIST_HEAD(&dev->queue_list);
|
|
spin_lock_init(&dev->queue_lock);
|
|
|
|
dev->nls = nls;
|
|
|
|
dev->cn_queue = create_singlethread_workqueue(dev->name);
|
|
if (!dev->cn_queue) {
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
void cn_queue_free_dev(struct cn_queue_dev *dev)
|
|
{
|
|
struct cn_callback_entry *cbq, *n;
|
|
|
|
flush_workqueue(dev->cn_queue);
|
|
destroy_workqueue(dev->cn_queue);
|
|
|
|
spin_lock_bh(&dev->queue_lock);
|
|
list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry)
|
|
list_del(&cbq->callback_entry);
|
|
spin_unlock_bh(&dev->queue_lock);
|
|
|
|
while (atomic_read(&dev->refcnt)) {
|
|
printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n",
|
|
dev->name, atomic_read(&dev->refcnt));
|
|
msleep(1000);
|
|
}
|
|
|
|
kfree(dev);
|
|
dev = NULL;
|
|
}
|