1 /* 2 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * 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 OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 */ 23 #include "qmgr.h" 24 25 struct nvkm_falcon_qmgr_seq * 26 nvkm_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 48 void 49 nvkm_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 59 void 60 nvkm_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 69 int 70 nvkm_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