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/*
* Copyright 2013-2014 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.
*/
#include <core/event.h>
#include <core/subdev.h>
static void
nvkm_event_put(struct nvkm_event *event, u32 types, int index)
{
assert_spin_locked(&event->refs_lock);
nvkm_trace(event->subdev, "event: decr %08x on %d\n", types, index);
while (types) {
int type = __ffs(types); types &= ~(1 << type);
if (--event->refs[index * event->types_nr + type] == 0) {
nvkm_trace(event->subdev, "event: blocking %d on %d\n", type, index);
if (event->func->fini)
event->func->fini(event, 1 << type, index);
}
}
}
static void
nvkm_event_get(struct nvkm_event *event, u32 types, int index)
{
assert_spin_locked(&event->refs_lock);
nvkm_trace(event->subdev, "event: incr %08x on %d\n", types, index);
while (types) {
int type = __ffs(types); types &= ~(1 << type);
if (++event->refs[index * event->types_nr + type] == 1) {
nvkm_trace(event->subdev, "event: allowing %d on %d\n", type, index);
if (event->func->init)
event->func->init(event, 1 << type, index);
}
}
}
static void
nvkm_event_ntfy_state(struct nvkm_event_ntfy *ntfy)
{
struct nvkm_event *event = ntfy->event;
unsigned long flags;
nvkm_trace(event->subdev, "event: ntfy state changed\n");
spin_lock_irqsave(&event->refs_lock, flags);
if (atomic_read(&ntfy->allowed) != ntfy->running) {
if (ntfy->running) {
nvkm_event_put(ntfy->event, ntfy->bits, ntfy->id);
ntfy->running = false;
} else {
nvkm_event_get(ntfy->event, ntfy->bits, ntfy->id);
ntfy->running = true;
}
}
spin_unlock_irqrestore(&event->refs_lock, flags);
}
static void
nvkm_event_ntfy_remove(struct nvkm_event_ntfy *ntfy)
{
write_lock_irq(&ntfy->event->list_lock);
list_del_init(&ntfy->head);
write_unlock_irq(&ntfy->event->list_lock);
}
static void
nvkm_event_ntfy_insert(struct nvkm_event_ntfy *ntfy)
{
write_lock_irq(&ntfy->event->list_lock);
list_add_tail(&ntfy->head, &ntfy->event->ntfy);
write_unlock_irq(&ntfy->event->list_lock);
}
static void
nvkm_event_ntfy_block_(struct nvkm_event_ntfy *ntfy, bool wait)
{
struct nvkm_subdev *subdev = ntfy->event->subdev;
nvkm_trace(subdev, "event: ntfy block %08x on %d wait:%d\n", ntfy->bits, ntfy->id, wait);
if (atomic_xchg(&ntfy->allowed, 0) == 1) {
nvkm_event_ntfy_state(ntfy);
if (wait)
nvkm_event_ntfy_remove(ntfy);
}
}
void
nvkm_event_ntfy_block(struct nvkm_event_ntfy *ntfy)
{
if (ntfy->event)
nvkm_event_ntfy_block_(ntfy, ntfy->wait);
}
void
nvkm_event_ntfy_allow(struct nvkm_event_ntfy *ntfy)
{
nvkm_trace(ntfy->event->subdev, "event: ntfy allow %08x on %d\n", ntfy->bits, ntfy->id);
if (atomic_xchg(&ntfy->allowed, 1) == 0) {
nvkm_event_ntfy_state(ntfy);
if (ntfy->wait)
nvkm_event_ntfy_insert(ntfy);
}
}
void
nvkm_event_ntfy_del(struct nvkm_event_ntfy *ntfy)
{
struct nvkm_event *event = ntfy->event;
if (!event)
return;
nvkm_trace(event->subdev, "event: ntfy del %08x on %d\n", ntfy->bits, ntfy->id);
nvkm_event_ntfy_block_(ntfy, false);
nvkm_event_ntfy_remove(ntfy);
ntfy->event = NULL;
}
void
nvkm_event_ntfy_add(struct nvkm_event *event, int id, u32 bits, bool wait, nvkm_event_func func,
struct nvkm_event_ntfy *ntfy)
{
nvkm_trace(event->subdev, "event: ntfy add %08x on %d wait:%d\n", id, bits, wait);
ntfy->event = event;
ntfy->id = id;
ntfy->bits = bits;
ntfy->wait = wait;
ntfy->func = func;
atomic_set(&ntfy->allowed, 0);
ntfy->running = false;
INIT_LIST_HEAD(&ntfy->head);
if (!ntfy->wait)
nvkm_event_ntfy_insert(ntfy);
}
bool
nvkm_event_ntfy_valid(struct nvkm_event *event, int id, u32 bits)
{
return true;
}
void
nvkm_event_ntfy(struct nvkm_event *event, int id, u32 bits)
{
struct nvkm_event_ntfy *ntfy, *ntmp;
unsigned long flags;
if (!event->refs || WARN_ON(id >= event->index_nr))
return;
nvkm_trace(event->subdev, "event: ntfy %08x on %d\n", bits, id);
read_lock_irqsave(&event->list_lock, flags);
list_for_each_entry_safe(ntfy, ntmp, &event->ntfy, head) {
if (ntfy->id == id && ntfy->bits & bits) {
if (atomic_read(&ntfy->allowed))
ntfy->func(ntfy, ntfy->bits & bits);
}
}
read_unlock_irqrestore(&event->list_lock, flags);
}
void
nvkm_event_fini(struct nvkm_event *event)
{
if (event->refs) {
kfree(event->refs);
event->refs = NULL;
}
}
int
__nvkm_event_init(const struct nvkm_event_func *func, struct nvkm_subdev *subdev,
int types_nr, int index_nr, struct nvkm_event *event)
{
event->refs = kzalloc(array3_size(index_nr, types_nr, sizeof(*event->refs)), GFP_KERNEL);
if (!event->refs)
return -ENOMEM;
event->func = func;
event->subdev = subdev;
event->types_nr = types_nr;
event->index_nr = index_nr;
INIT_LIST_HEAD(&event->ntfy);
return 0;
}
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