/*
* Copyright 2020 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 "chid.h"
void
nvkm_chid_put(struct nvkm_chid *chid, int id, spinlock_t *data_lock)
{
if (id >= 0) {
spin_lock_irq(&chid->lock);
spin_lock(data_lock);
chid->data[id] = NULL;
spin_unlock(data_lock);
clear_bit(id, chid->used);
spin_unlock_irq(&chid->lock);
}
}
int
nvkm_chid_get(struct nvkm_chid *chid, void *data)
{
int id = -1, cid;
spin_lock_irq(&chid->lock);
cid = find_first_zero_bit(chid->used, chid->nr);
if (cid < chid->nr) {
set_bit(cid, chid->used);
chid->data[cid] = data;
id = cid;
}
spin_unlock_irq(&chid->lock);
return id;
}
static void
nvkm_chid_del(struct kref *kref)
{
struct nvkm_chid *chid = container_of(kref, typeof(*chid), kref);
nvkm_event_fini(&chid->event);
kvfree(chid->data);
kfree(chid);
}
void
nvkm_chid_unref(struct nvkm_chid **pchid)
{
struct nvkm_chid *chid = *pchid;
if (!chid)
return;
kref_put(&chid->kref, nvkm_chid_del);
*pchid = NULL;
}
struct nvkm_chid *
nvkm_chid_ref(struct nvkm_chid *chid)
{
if (chid)
kref_get(&chid->kref);
return chid;
}
int
nvkm_chid_new(const struct nvkm_event_func *func, struct nvkm_subdev *subdev,
int nr, int first, int count, struct nvkm_chid **pchid)
{
struct nvkm_chid *chid;
int id;
if (!(chid = *pchid = kzalloc(struct_size(chid, used, nr), GFP_KERNEL)))
return -ENOMEM;
kref_init(&chid->kref);
chid->nr = nr;
chid->mask = chid->nr - 1;
spin_lock_init(&chid->lock);
if (!(chid->data = kvzalloc(sizeof(*chid->data) * nr, GFP_KERNEL))) {
nvkm_chid_unref(pchid);
return -ENOMEM;
}
for (id = 0; id < first; id++)
__set_bit(id, chid->used);
for (id = first + count; id < nr; id++)
__set_bit(id, chid->used);
return nvkm_event_init(func, subdev, 1, nr, &chid->event);
}