mm/shuffle.h

   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 */