// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SPU file system
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Arnd Bergmann <arndb@de.ibm.com>
 */

#include <linux/list.h>
#include <linux/slab.h>

#include "spufs.h"

struct spu_gang *alloc_spu_gang(void)
{
        struct spu_gang *gang;

        gang = kzalloc_obj(*gang);
        if (!gang)
                goto out;

        kref_init(&gang->kref);
        mutex_init(&gang->mutex);
        mutex_init(&gang->aff_mutex);
        INIT_LIST_HEAD(&gang->list);
        INIT_LIST_HEAD(&gang->aff_list_head);
        gang->alive = 1;

out:
        return gang;
}

static void destroy_spu_gang(struct kref *kref)
{
        struct spu_gang *gang;
        gang = container_of(kref, struct spu_gang, kref);
        WARN_ON(gang->contexts || !list_empty(&gang->list));
        kfree(gang);
}

struct spu_gang *get_spu_gang(struct spu_gang *gang)
{
        kref_get(&gang->kref);
        return gang;
}

int put_spu_gang(struct spu_gang *gang)
{
        return kref_put(&gang->kref, &destroy_spu_gang);
}

void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
{
        mutex_lock(&gang->mutex);
        ctx->gang = get_spu_gang(gang);
        list_add(&ctx->gang_list, &gang->list);
        gang->contexts++;
        mutex_unlock(&gang->mutex);
}

void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
{
        mutex_lock(&gang->mutex);
        WARN_ON(ctx->gang != gang);
        if (!list_empty(&ctx->aff_list)) {
                list_del_init(&ctx->aff_list);
                gang->aff_flags &= ~AFF_OFFSETS_SET;
        }
        list_del_init(&ctx->gang_list);
        gang->contexts--;
        mutex_unlock(&gang->mutex);

        put_spu_gang(gang);
}