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992bf775 AK |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_MEMORY_TIERS_H | |
3 | #define _LINUX_MEMORY_TIERS_H | |
4 | ||
7b88bda3 AK |
5 | #include <linux/types.h> |
6 | #include <linux/nodemask.h> | |
7 | #include <linux/kref.h> | |
32008027 | 8 | #include <linux/mmzone.h> |
07a8bdd4 | 9 | #include <linux/notifier.h> |
992bf775 AK |
10 | /* |
11 | * Each tier cover a abstrace distance chunk size of 128 | |
12 | */ | |
13 | #define MEMTIER_CHUNK_BITS 7 | |
14 | #define MEMTIER_CHUNK_SIZE (1 << MEMTIER_CHUNK_BITS) | |
15 | /* | |
16 | * Smaller abstract distance values imply faster (higher) memory tiers. Offset | |
17 | * the DRAM adistance so that we can accommodate devices with a slightly lower | |
18 | * adistance value (slightly faster) than default DRAM adistance to be part of | |
19 | * the same memory tier. | |
20 | */ | |
21 | #define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1)) | |
22 | ||
7b88bda3 AK |
23 | struct memory_tier; |
24 | struct memory_dev_type { | |
25 | /* list of memory types that are part of same tier as this type */ | |
51a23b1b | 26 | struct list_head tier_sibling; |
6bc2cfdf HY |
27 | /* list of memory types that are managed by one driver */ |
28 | struct list_head list; | |
7b88bda3 AK |
29 | /* abstract distance for this specific memory type */ |
30 | int adistance; | |
31 | /* Nodes of same abstract distance */ | |
32 | nodemask_t nodes; | |
33 | struct kref kref; | |
7b88bda3 AK |
34 | }; |
35 | ||
6a954e94 | 36 | struct access_coordinate; |
3718c02d | 37 | |
91952440 | 38 | #ifdef CONFIG_NUMA |
91952440 | 39 | extern bool numa_demotion_enabled; |
3718c02d | 40 | extern struct memory_dev_type *default_dram_type; |
7b88bda3 | 41 | struct memory_dev_type *alloc_memory_type(int adistance); |
bded67f8 | 42 | void put_memory_type(struct memory_dev_type *memtype); |
7b88bda3 AK |
43 | void init_node_memory_type(int node, struct memory_dev_type *default_type); |
44 | void clear_node_memory_type(int node, struct memory_dev_type *memtype); | |
07a8bdd4 HY |
45 | int register_mt_adistance_algorithm(struct notifier_block *nb); |
46 | int unregister_mt_adistance_algorithm(struct notifier_block *nb); | |
47 | int mt_calc_adistance(int node, int *adist); | |
6a954e94 | 48 | int mt_set_default_dram_perf(int nid, struct access_coordinate *perf, |
3718c02d | 49 | const char *source); |
6a954e94 | 50 | int mt_perf_to_adistance(struct access_coordinate *perf, int *adist); |
a72a30af HRJC |
51 | struct memory_dev_type *mt_find_alloc_memory_type(int adist, |
52 | struct list_head *memory_types); | |
53 | void mt_put_memory_types(struct list_head *memory_types); | |
6c542ab7 AK |
54 | #ifdef CONFIG_MIGRATION |
55 | int next_demotion_node(int node); | |
32008027 | 56 | void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets); |
467b171a | 57 | bool node_is_toptier(int node); |
6c542ab7 AK |
58 | #else |
59 | static inline int next_demotion_node(int node) | |
60 | { | |
61 | return NUMA_NO_NODE; | |
62 | } | |
32008027 JG |
63 | |
64 | static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets) | |
65 | { | |
66 | *targets = NODE_MASK_NONE; | |
67 | } | |
467b171a AK |
68 | |
69 | static inline bool node_is_toptier(int node) | |
70 | { | |
71 | return true; | |
72 | } | |
6c542ab7 | 73 | #endif |
91952440 AK |
74 | |
75 | #else | |
76 | ||
77 | #define numa_demotion_enabled false | |
3718c02d | 78 | #define default_dram_type NULL |
7b88bda3 AK |
79 | /* |
80 | * CONFIG_NUMA implementation returns non NULL error. | |
81 | */ | |
82 | static inline struct memory_dev_type *alloc_memory_type(int adistance) | |
83 | { | |
84 | return NULL; | |
85 | } | |
86 | ||
bded67f8 | 87 | static inline void put_memory_type(struct memory_dev_type *memtype) |
7b88bda3 AK |
88 | { |
89 | ||
90 | } | |
91 | ||
92 | static inline void init_node_memory_type(int node, struct memory_dev_type *default_type) | |
93 | { | |
94 | ||
95 | } | |
96 | ||
97 | static inline void clear_node_memory_type(int node, struct memory_dev_type *memtype) | |
98 | { | |
99 | ||
100 | } | |
6c542ab7 AK |
101 | |
102 | static inline int next_demotion_node(int node) | |
103 | { | |
104 | return NUMA_NO_NODE; | |
105 | } | |
32008027 JG |
106 | |
107 | static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets) | |
108 | { | |
109 | *targets = NODE_MASK_NONE; | |
110 | } | |
467b171a AK |
111 | |
112 | static inline bool node_is_toptier(int node) | |
113 | { | |
114 | return true; | |
115 | } | |
07a8bdd4 HY |
116 | |
117 | static inline int register_mt_adistance_algorithm(struct notifier_block *nb) | |
118 | { | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static inline int unregister_mt_adistance_algorithm(struct notifier_block *nb) | |
123 | { | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static inline int mt_calc_adistance(int node, int *adist) | |
128 | { | |
129 | return NOTIFY_DONE; | |
130 | } | |
3718c02d | 131 | |
6a954e94 | 132 | static inline int mt_set_default_dram_perf(int nid, struct access_coordinate *perf, |
3718c02d HY |
133 | const char *source) |
134 | { | |
135 | return -EIO; | |
136 | } | |
137 | ||
6a954e94 | 138 | static inline int mt_perf_to_adistance(struct access_coordinate *perf, int *adist) |
3718c02d HY |
139 | { |
140 | return -EIO; | |
141 | } | |
a72a30af HRJC |
142 | |
143 | static inline struct memory_dev_type *mt_find_alloc_memory_type(int adist, | |
144 | struct list_head *memory_types) | |
145 | { | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | static inline void mt_put_memory_types(struct list_head *memory_types) | |
150 | { | |
151 | } | |
91952440 | 152 | #endif /* CONFIG_NUMA */ |
992bf775 | 153 | #endif /* _LINUX_MEMORY_TIERS_H */ |