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1/*2 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 */23#include "qmgr.h"24 25struct nvkm_falcon_qmgr_seq *26nvkm_falcon_qmgr_seq_acquire(struct nvkm_falcon_qmgr *qmgr)27{28 const struct nvkm_subdev *subdev = qmgr->falcon->owner;29 struct nvkm_falcon_qmgr_seq *seq;30 u32 index;31 32 mutex_lock(&qmgr->seq.mutex);33 index = find_first_zero_bit(qmgr->seq.tbl, NVKM_FALCON_QMGR_SEQ_NUM);34 if (index >= NVKM_FALCON_QMGR_SEQ_NUM) {35 nvkm_error(subdev, "no free sequence available\n");36 mutex_unlock(&qmgr->seq.mutex);37 return ERR_PTR(-EAGAIN);38 }39 40 set_bit(index, qmgr->seq.tbl);41 mutex_unlock(&qmgr->seq.mutex);42 43 seq = &qmgr->seq.id[index];44 seq->state = SEQ_STATE_PENDING;45 return seq;46}47 48void49nvkm_falcon_qmgr_seq_release(struct nvkm_falcon_qmgr *qmgr,50 struct nvkm_falcon_qmgr_seq *seq)51{52 /* no need to acquire seq.mutex since clear_bit is atomic */53 seq->state = SEQ_STATE_FREE;54 seq->callback = NULL;55 reinit_completion(&seq->done);56 clear_bit(seq->id, qmgr->seq.tbl);57}58 59void60nvkm_falcon_qmgr_del(struct nvkm_falcon_qmgr **pqmgr)61{62 struct nvkm_falcon_qmgr *qmgr = *pqmgr;63 if (qmgr) {64 kfree(*pqmgr);65 *pqmgr = NULL;66 }67}68 69int70nvkm_falcon_qmgr_new(struct nvkm_falcon *falcon,71 struct nvkm_falcon_qmgr **pqmgr)72{73 struct nvkm_falcon_qmgr *qmgr;74 int i;75 76 if (!(qmgr = *pqmgr = kzalloc(sizeof(*qmgr), GFP_KERNEL)))77 return -ENOMEM;78 79 qmgr->falcon = falcon;80 mutex_init(&qmgr->seq.mutex);81 for (i = 0; i < NVKM_FALCON_QMGR_SEQ_NUM; i++) {82 qmgr->seq.id[i].id = i;83 init_completion(&qmgr->seq.id[i].done);84 }85 86 return 0;87}88