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 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 */