cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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qmgr.c (2632B)

      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
     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
     48void
     49nvkm_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
     59void
     60nvkm_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
     69int
     70nvkm_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}