1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright(c) 2018 Intel Corporation. All rights reserved. 3 #ifndef _MM_SHUFFLE_H 4 #define _MM_SHUFFLE_H 5 #include <linux/jump_label.h> 6 7 /* 8 * SHUFFLE_ENABLE is called from the command line enabling path, or by 9 * platform-firmware enabling that indicates the presence of a 10 * direct-mapped memory-side-cache. SHUFFLE_FORCE_DISABLE is called from 11 * the command line path and overrides any previous or future 12 * SHUFFLE_ENABLE. 13 */ 14 enum mm_shuffle_ctl { 15 SHUFFLE_ENABLE, 16 SHUFFLE_FORCE_DISABLE, 17 }; 18 19 #define SHUFFLE_ORDER (MAX_ORDER-1) 20 21 #ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR 22 DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key); 23 extern void page_alloc_shuffle(enum mm_shuffle_ctl ctl); 24 extern void __shuffle_free_memory(pg_data_t *pgdat); 25 static inline void shuffle_free_memory(pg_data_t *pgdat) 26 { 27 if (!static_branch_unlikely(&page_alloc_shuffle_key)) 28 return; 29 __shuffle_free_memory(pgdat); 30 } 31 32 extern void __shuffle_zone(struct zone *z); 33 static inline void shuffle_zone(struct zone *z) 34 { 35 if (!static_branch_unlikely(&page_alloc_shuffle_key)) 36 return; 37 __shuffle_zone(z); 38 } 39 40 static inline bool is_shuffle_order(int order) 41 { 42 if (!static_branch_unlikely(&page_alloc_shuffle_key)) 43 return false; 44 return order >= SHUFFLE_ORDER; 45 } 46 #else 47 static inline void shuffle_free_memory(pg_data_t *pgdat) 48 { 49 } 50 51 static inline void shuffle_zone(struct zone *z) 52 { 53 } 54 55 static inline void page_alloc_shuffle(enum mm_shuffle_ctl ctl) 56 { 57 } 58 59 static inline bool is_shuffle_order(int order) 60 { 61 return false; 62 } 63 #endif 64 #endif /* _MM_SHUFFLE_H */ 65