/*
|
* Copyright 2014 Red Hat Inc.
|
*
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
* copy of this software and associated documentation files (the "Software"),
|
* to deal in the Software without restriction, including without limitation
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
* and/or sell copies of the Software, and to permit persons to whom the
|
* Software is furnished to do so, subject to the following conditions:
|
*
|
* The above copyright notice and this permission notice shall be included in
|
* all copies or substantial portions of the Software.
|
*
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
|
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
|
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
* OTHER DEALINGS IN THE SOFTWARE.
|
*
|
* Authors: Ben Skeggs <bskeggs@redhat.com>
|
*/
|
#include <core/notify.h>
|
#include <core/event.h>
|
|
static inline void
|
nvkm_notify_put_locked(struct nvkm_notify *notify)
|
{
|
if (notify->block++ == 0)
|
nvkm_event_put(notify->event, notify->types, notify->index);
|
}
|
|
void
|
nvkm_notify_put(struct nvkm_notify *notify)
|
{
|
struct nvkm_event *event = notify->event;
|
unsigned long flags;
|
if (likely(event) &&
|
test_and_clear_bit(NVKM_NOTIFY_USER, ¬ify->flags)) {
|
spin_lock_irqsave(&event->refs_lock, flags);
|
nvkm_notify_put_locked(notify);
|
spin_unlock_irqrestore(&event->refs_lock, flags);
|
if (test_bit(NVKM_NOTIFY_WORK, ¬ify->flags))
|
flush_work(¬ify->work);
|
}
|
}
|
|
static inline void
|
nvkm_notify_get_locked(struct nvkm_notify *notify)
|
{
|
if (--notify->block == 0)
|
nvkm_event_get(notify->event, notify->types, notify->index);
|
}
|
|
void
|
nvkm_notify_get(struct nvkm_notify *notify)
|
{
|
struct nvkm_event *event = notify->event;
|
unsigned long flags;
|
if (likely(event) &&
|
!test_and_set_bit(NVKM_NOTIFY_USER, ¬ify->flags)) {
|
spin_lock_irqsave(&event->refs_lock, flags);
|
nvkm_notify_get_locked(notify);
|
spin_unlock_irqrestore(&event->refs_lock, flags);
|
}
|
}
|
|
static inline void
|
nvkm_notify_func(struct nvkm_notify *notify)
|
{
|
struct nvkm_event *event = notify->event;
|
int ret = notify->func(notify);
|
unsigned long flags;
|
if ((ret == NVKM_NOTIFY_KEEP) ||
|
!test_and_clear_bit(NVKM_NOTIFY_USER, ¬ify->flags)) {
|
spin_lock_irqsave(&event->refs_lock, flags);
|
nvkm_notify_get_locked(notify);
|
spin_unlock_irqrestore(&event->refs_lock, flags);
|
}
|
}
|
|
static void
|
nvkm_notify_work(struct work_struct *work)
|
{
|
struct nvkm_notify *notify = container_of(work, typeof(*notify), work);
|
nvkm_notify_func(notify);
|
}
|
|
void
|
nvkm_notify_send(struct nvkm_notify *notify, void *data, u32 size)
|
{
|
struct nvkm_event *event = notify->event;
|
unsigned long flags;
|
|
assert_spin_locked(&event->list_lock);
|
BUG_ON(size != notify->size);
|
|
spin_lock_irqsave(&event->refs_lock, flags);
|
if (notify->block) {
|
spin_unlock_irqrestore(&event->refs_lock, flags);
|
return;
|
}
|
nvkm_notify_put_locked(notify);
|
spin_unlock_irqrestore(&event->refs_lock, flags);
|
|
if (test_bit(NVKM_NOTIFY_WORK, ¬ify->flags)) {
|
memcpy((void *)notify->data, data, size);
|
schedule_work(¬ify->work);
|
} else {
|
notify->data = data;
|
nvkm_notify_func(notify);
|
notify->data = NULL;
|
}
|
}
|
|
void
|
nvkm_notify_fini(struct nvkm_notify *notify)
|
{
|
unsigned long flags;
|
if (notify->event) {
|
nvkm_notify_put(notify);
|
spin_lock_irqsave(¬ify->event->list_lock, flags);
|
list_del(¬ify->head);
|
spin_unlock_irqrestore(¬ify->event->list_lock, flags);
|
kfree((void *)notify->data);
|
notify->event = NULL;
|
}
|
}
|
|
int
|
nvkm_notify_init(struct nvkm_object *object, struct nvkm_event *event,
|
int (*func)(struct nvkm_notify *), bool work,
|
void *data, u32 size, u32 reply,
|
struct nvkm_notify *notify)
|
{
|
unsigned long flags;
|
int ret = -ENODEV;
|
if ((notify->event = event), event->refs) {
|
ret = event->func->ctor(object, data, size, notify);
|
if (ret == 0 && (ret = -EINVAL, notify->size == reply)) {
|
notify->flags = 0;
|
notify->block = 1;
|
notify->func = func;
|
notify->data = NULL;
|
if (ret = 0, work) {
|
INIT_WORK(¬ify->work, nvkm_notify_work);
|
set_bit(NVKM_NOTIFY_WORK, ¬ify->flags);
|
notify->data = kmalloc(reply, GFP_KERNEL);
|
if (!notify->data)
|
ret = -ENOMEM;
|
}
|
}
|
if (ret == 0) {
|
spin_lock_irqsave(&event->list_lock, flags);
|
list_add_tail(¬ify->head, &event->list);
|
spin_unlock_irqrestore(&event->list_lock, flags);
|
}
|
}
|
if (ret)
|
notify->event = NULL;
|
return ret;
|
}
|