/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2023-2024 Intel Corporation
 * Copyright © 2026 Sourojeet Adhikari, Sponsored by FreeBSD Foundation 
 */

#ifndef _CGROUP_DMEM_H
#define _CGROUP_DMEM_H

#include <linux/types.h>
#include <linux/kernel.h> 
#include <linux/list.h>

/*
 * TODO:
 * When CONFIG_CGROUP_DMEM is enabled, quite a few more functions
 * are exposed, and can be used. As of how I have not implemented 
 * them as they are not need by my use case at this moment.
 */

struct dmem_cgroup_pool_state;

struct dmem_cgroup_region;

static inline __printf(2, 3) struct dmem_cgroup_region *
dmem_cgroup_register_region(u64 size, const char *name_fmt, ...)
{
        return NULL;
}

static inline void 
dmem_cgroup_unregister_region(struct dmem_cgroup_region *region)
{ }

static inline int 
dmem_cgroup_try_charge(struct dmem_cgroup_region *region, u64 size,
                       struct dmem_cgroup_pool_state **ret_pool,
                       struct dmem_cgroup_pool_state **ret_limit_pool)
{
        *ret_pool = NULL;

        if (ret_limit_pool)
                *ret_limit_pool = NULL;

        return 0;
}

static inline void 
dmem_cgroup_uncharge(struct dmem_cgroup_pool_state *pool, u64 size)
{ }

static inline bool 
dmem_cgroup_state_evict_valuable(struct dmem_cgroup_pool_state *limit_pool,
                                 struct dmem_cgroup_pool_state *test_pool,
                                 bool ignore_low, bool *ret_hit_low)
{
        return true;
}

static inline void 
dmem_cgroup_pool_state_put(struct dmem_cgroup_pool_state *pool)
{ }

#endif