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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gang.c (1512B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * SPU file system
      4 *
      5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
      6 *
      7 * Author: Arnd Bergmann <arndb@de.ibm.com>
      8 */
      9
     10#include <linux/list.h>
     11#include <linux/slab.h>
     12
     13#include "spufs.h"
     14
     15struct spu_gang *alloc_spu_gang(void)
     16{
     17	struct spu_gang *gang;
     18
     19	gang = kzalloc(sizeof *gang, GFP_KERNEL);
     20	if (!gang)
     21		goto out;
     22
     23	kref_init(&gang->kref);
     24	mutex_init(&gang->mutex);
     25	mutex_init(&gang->aff_mutex);
     26	INIT_LIST_HEAD(&gang->list);
     27	INIT_LIST_HEAD(&gang->aff_list_head);
     28
     29out:
     30	return gang;
     31}
     32
     33static void destroy_spu_gang(struct kref *kref)
     34{
     35	struct spu_gang *gang;
     36	gang = container_of(kref, struct spu_gang, kref);
     37	WARN_ON(gang->contexts || !list_empty(&gang->list));
     38	kfree(gang);
     39}
     40
     41struct spu_gang *get_spu_gang(struct spu_gang *gang)
     42{
     43	kref_get(&gang->kref);
     44	return gang;
     45}
     46
     47int put_spu_gang(struct spu_gang *gang)
     48{
     49	return kref_put(&gang->kref, &destroy_spu_gang);
     50}
     51
     52void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
     53{
     54	mutex_lock(&gang->mutex);
     55	ctx->gang = get_spu_gang(gang);
     56	list_add(&ctx->gang_list, &gang->list);
     57	gang->contexts++;
     58	mutex_unlock(&gang->mutex);
     59}
     60
     61void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
     62{
     63	mutex_lock(&gang->mutex);
     64	WARN_ON(ctx->gang != gang);
     65	if (!list_empty(&ctx->aff_list)) {
     66		list_del_init(&ctx->aff_list);
     67		gang->aff_flags &= ~AFF_OFFSETS_SET;
     68	}
     69	list_del_init(&ctx->gang_list);
     70	gang->contexts--;
     71	mutex_unlock(&gang->mutex);
     72
     73	put_spu_gang(gang);
     74}