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/*
* Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include "qmgr.h"
struct nvkm_falcon_qmgr_seq *
nvkm_falcon_qmgr_seq_acquire(struct nvkm_falcon_qmgr *qmgr)
{
const struct nvkm_subdev *subdev = qmgr->falcon->owner;
struct nvkm_falcon_qmgr_seq *seq;
u32 index;
mutex_lock(&qmgr->seq.mutex);
index = find_first_zero_bit(qmgr->seq.tbl, NVKM_FALCON_QMGR_SEQ_NUM);
if (index >= NVKM_FALCON_QMGR_SEQ_NUM) {
nvkm_error(subdev, "no free sequence available\n");
mutex_unlock(&qmgr->seq.mutex);
return ERR_PTR(-EAGAIN);
}
set_bit(index, qmgr->seq.tbl);
mutex_unlock(&qmgr->seq.mutex);
seq = &qmgr->seq.id[index];
seq->state = SEQ_STATE_PENDING;
return seq;
}
void
nvkm_falcon_qmgr_seq_release(struct nvkm_falcon_qmgr *qmgr,
struct nvkm_falcon_qmgr_seq *seq)
{
/* no need to acquire seq.mutex since clear_bit is atomic */
seq->state = SEQ_STATE_FREE;
seq->callback = NULL;
reinit_completion(&seq->done);
clear_bit(seq->id, qmgr->seq.tbl);
}
void
nvkm_falcon_qmgr_del(struct nvkm_falcon_qmgr **pqmgr)
{
struct nvkm_falcon_qmgr *qmgr = *pqmgr;
if (qmgr) {
kfree(*pqmgr);
*pqmgr = NULL;
}
}
int
nvkm_falcon_qmgr_new(struct nvkm_falcon *falcon,
struct nvkm_falcon_qmgr **pqmgr)
{
struct nvkm_falcon_qmgr *qmgr;
int i;
if (!(qmgr = *pqmgr = kzalloc(sizeof(*qmgr), GFP_KERNEL)))
return -ENOMEM;
qmgr->falcon = falcon;
mutex_init(&qmgr->seq.mutex);
for (i = 0; i < NVKM_FALCON_QMGR_SEQ_NUM; i++) {
qmgr->seq.id[i].id = i;
init_completion(&qmgr->seq.id[i].done);
}
return 0;
}
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