Home | History | Annotate | Line # | Download | only in falcon 
      1 /*	$NetBSD: nouveau_nvkm_falcon_qmgr.c,v 1.4 2021/12/19 11:34:45 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  */
     25 #include <sys/cdefs.h>
     26 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_falcon_qmgr.c,v 1.4 2021/12/19 11:34:45 riastradh Exp $");
     27 
     28 #include "qmgr.h"
     29 
     30 #include <linux/nbsd-namespace.h>
     31 
     32 struct nvkm_falcon_qmgr_seq *
     33 nvkm_falcon_qmgr_seq_acquire(struct nvkm_falcon_qmgr *qmgr)
     34 {
     35 	const struct nvkm_subdev *subdev = qmgr->falcon->owner;
     36 	struct nvkm_falcon_qmgr_seq *seq;
     37 	u32 index;
     38 
     39 	mutex_lock(&qmgr->seq.mutex);
     40 	index = find_first_zero_bit(qmgr->seq.tbl, NVKM_FALCON_QMGR_SEQ_NUM);
     41 	if (index >= NVKM_FALCON_QMGR_SEQ_NUM) {
     42 		nvkm_error(subdev, "no free sequence available\n");
     43 		mutex_unlock(&qmgr->seq.mutex);
     44 		return ERR_PTR(-EAGAIN);
     45 	}
     46 
     47 	set_bit(index, qmgr->seq.tbl);
     48 	mutex_unlock(&qmgr->seq.mutex);
     49 
     50 	seq = &qmgr->seq.id[index];
     51 	seq->state = SEQ_STATE_PENDING;
     52 	return seq;
     53 }
     54 
     55 void
     56 nvkm_falcon_qmgr_seq_release(struct nvkm_falcon_qmgr *qmgr,
     57 			     struct nvkm_falcon_qmgr_seq *seq)
     58 {
     59 	/* no need to acquire seq.mutex since clear_bit is atomic */
     60 	seq->state = SEQ_STATE_FREE;
     61 	seq->callback = NULL;
     62 	reinit_completion(&seq->done);
     63 	clear_bit(seq->id, qmgr->seq.tbl);
     64 }
     65 
     66 void
     67 nvkm_falcon_qmgr_del(struct nvkm_falcon_qmgr **pqmgr)
     68 {
     69 	struct nvkm_falcon_qmgr *qmgr = *pqmgr;
     70 	if (qmgr) {
     71 		mutex_destroy(&qmgr->seq.mutex);
     72 		kfree(*pqmgr);
     73 		*pqmgr = NULL;
     74 	}
     75 }
     76 
     77 int
     78 nvkm_falcon_qmgr_new(struct nvkm_falcon *falcon,
     79 		     struct nvkm_falcon_qmgr **pqmgr)
     80 {
     81 	struct nvkm_falcon_qmgr *qmgr;
     82 	int i;
     83 
     84 	if (!(qmgr = *pqmgr = kzalloc(sizeof(*qmgr), GFP_KERNEL)))
     85 		return -ENOMEM;
     86 
     87 	qmgr->falcon = falcon;
     88 	mutex_init(&qmgr->seq.mutex);
     89 	for (i = 0; i < NVKM_FALCON_QMGR_SEQ_NUM; i++) {
     90 		qmgr->seq.id[i].id = i;
     91 		init_completion(&qmgr->seq.id[i].done);
     92 	}
     93 
     94 	return 0;
     95 }
     96