112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
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/*
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* Copyright 2020 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "chid.h"
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void
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nvkm_chid_put(struct nvkm_chid *chid, int id, spinlock_t *data_lock)
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{
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if (id >= 0) {
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spin_lock_irq(&chid->lock);
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spin_lock(data_lock);
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chid->data[id] = NULL;
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spin_unlock(data_lock);
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clear_bit(id, chid->used);
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spin_unlock_irq(&chid->lock);
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}
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}
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int
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nvkm_chid_get(struct nvkm_chid *chid, void *data)
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{
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int id = -1, cid;
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spin_lock_irq(&chid->lock);
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cid = find_first_zero_bit(chid->used, chid->nr);
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if (cid < chid->nr) {
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set_bit(cid, chid->used);
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chid->data[cid] = data;
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id = cid;
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}
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spin_unlock_irq(&chid->lock);
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return id;
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}
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static void
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nvkm_chid_del(struct kref *kref)
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{
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struct nvkm_chid *chid = container_of(kref, typeof(*chid), kref);
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nvkm_event_fini(&chid->event);
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kvfree(chid->data);
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kfree(chid);
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}
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void
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nvkm_chid_unref(struct nvkm_chid **pchid)
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{
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struct nvkm_chid *chid = *pchid;
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if (!chid)
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return;
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kref_put(&chid->kref, nvkm_chid_del);
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*pchid = NULL;
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}
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struct nvkm_chid *
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nvkm_chid_ref(struct nvkm_chid *chid)
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{
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if (chid)
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kref_get(&chid->kref);
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return chid;
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}
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int
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nvkm_chid_new(const struct nvkm_event_func *func, struct nvkm_subdev *subdev,
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int nr, int first, int count, struct nvkm_chid **pchid)
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{
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struct nvkm_chid *chid;
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int id;
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if (!(chid = *pchid = kzalloc(struct_size(chid, used, nr), GFP_KERNEL)))
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return -ENOMEM;
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kref_init(&chid->kref);
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chid->nr = nr;
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chid->mask = chid->nr - 1;
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spin_lock_init(&chid->lock);
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if (!(chid->data = kvzalloc(sizeof(*chid->data) * nr, GFP_KERNEL))) {
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nvkm_chid_unref(pchid);
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return -ENOMEM;
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}
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for (id = 0; id < first; id++)
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__set_bit(id, chid->used);
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for (id = first + count; id < nr; id++)
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__set_bit(id, chid->used);
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return nvkm_event_init(func, subdev, 1, nr, &chid->event);
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}
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