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 extern bool shuffle_pick_tail(void); 26 static inline void shuffle_free_memory(pg_data_t *pgdat) 27 { 28 if (!static_branch_unlikely(&page_alloc_shuffle_key)) 29 return; 30 __shuffle_free_memory(pgdat); 31 } 32 33 extern void __shuffle_zone(struct zone *z); 34 static inline void shuffle_zone(struct zone *z) 35 { 36 if (!static_branch_unlikely(&page_alloc_shuffle_key)) 37 return; 38 __shuffle_zone(z); 39 } 40 41 static inline bool is_shuffle_order(int order) 42 { 43 if (!static_branch_unlikely(&page_alloc_shuffle_key)) 44 return false; 45 return order >= SHUFFLE_ORDER; 46 } 47 #else 48 static inline bool shuffle_pick_tail(void) 49 { 50 return false; 51 } 52 53 static inline void shuffle_free_memory(pg_data_t *pgdat) 54 { 55 } 56 57 static inline void shuffle_zone(struct zone *z) 58 { 59 } 60 61 static inline void page_alloc_shuffle(enum mm_shuffle_ctl ctl) 62 { 63 } 64 65 static inline bool is_shuffle_order(int order) 66 { 67 return false; 68 } 69 #endif 70 #endif /* _MM_SHUFFLE_H */ 71