88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
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/*
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* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
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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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*/
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#include "qmgr.h"
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struct nvkm_falcon_qmgr_seq *
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nvkm_falcon_qmgr_seq_acquire(struct nvkm_falcon_qmgr *qmgr)
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{
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const struct nvkm_subdev *subdev = qmgr->falcon->owner;
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struct nvkm_falcon_qmgr_seq *seq;
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u32 index;
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mutex_lock(&qmgr->seq.mutex);
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index = find_first_zero_bit(qmgr->seq.tbl, NVKM_FALCON_QMGR_SEQ_NUM);
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if (index >= NVKM_FALCON_QMGR_SEQ_NUM) {
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nvkm_error(subdev, "no free sequence available\n");
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mutex_unlock(&qmgr->seq.mutex);
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return ERR_PTR(-EAGAIN);
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}
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set_bit(index, qmgr->seq.tbl);
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mutex_unlock(&qmgr->seq.mutex);
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seq = &qmgr->seq.id[index];
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seq->state = SEQ_STATE_PENDING;
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return seq;
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}
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void
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nvkm_falcon_qmgr_seq_release(struct nvkm_falcon_qmgr *qmgr,
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struct nvkm_falcon_qmgr_seq *seq)
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{
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/* no need to acquire seq.mutex since clear_bit is atomic */
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seq->state = SEQ_STATE_FREE;
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seq->callback = NULL;
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reinit_completion(&seq->done);
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clear_bit(seq->id, qmgr->seq.tbl);
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}
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void
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nvkm_falcon_qmgr_del(struct nvkm_falcon_qmgr **pqmgr)
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{
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struct nvkm_falcon_qmgr *qmgr = *pqmgr;
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if (qmgr) {
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kfree(*pqmgr);
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*pqmgr = NULL;
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}
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}
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int
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nvkm_falcon_qmgr_new(struct nvkm_falcon *falcon,
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struct nvkm_falcon_qmgr **pqmgr)
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{
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struct nvkm_falcon_qmgr *qmgr;
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int i;
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if (!(qmgr = *pqmgr = kzalloc(sizeof(*qmgr), GFP_KERNEL)))
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return -ENOMEM;
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qmgr->falcon = falcon;
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mutex_init(&qmgr->seq.mutex);
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for (i = 0; i < NVKM_FALCON_QMGR_SEQ_NUM; i++) {
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qmgr->seq.id[i].id = i;
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init_completion(&qmgr->seq.id[i].done);
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}
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return 0;
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}
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