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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MEMORY_TIERS_H
#define _LINUX_MEMORY_TIERS_H
/*
* Each tier cover a abstrace distance chunk size of 128
*/
#define MEMTIER_CHUNK_BITS 7
#define MEMTIER_CHUNK_SIZE (1 << MEMTIER_CHUNK_BITS)
/*
* Smaller abstract distance values imply faster (higher) memory tiers. Offset
* the DRAM adistance so that we can accommodate devices with a slightly lower
* adistance value (slightly faster) than default DRAM adistance to be part of
* the same memory tier.
*/
#define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1))
#ifdef CONFIG_NUMA
#include <linux/types.h>
extern bool numa_demotion_enabled;
#else
#define numa_demotion_enabled false
#endif /* CONFIG_NUMA */
#endif /* _LINUX_MEMORY_TIERS_H */
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