1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * drmem.h: Power specific logical memory block representation
4 *
5 * Copyright 2017 IBM Corporation
6 */
7
8 #ifndef _ASM_POWERPC_LMB_H
9 #define _ASM_POWERPC_LMB_H
10
11 struct drmem_lmb {
12 u64 base_addr;
13 u32 drc_index;
14 u32 aa_index;
15 u32 flags;
16 #ifdef CONFIG_MEMORY_HOTPLUG
17 int nid;
18 #endif
19 };
20
21 struct drmem_lmb_info {
22 struct drmem_lmb *lmbs;
23 int n_lmbs;
24 u32 lmb_size;
25 };
26
27 extern struct drmem_lmb_info *drmem_info;
28
29 #define for_each_drmem_lmb_in_range(lmb, start, end) \
30 for ((lmb) = (start); (lmb) <= (end); (lmb)++)
31
32 #define for_each_drmem_lmb(lmb) \
33 for_each_drmem_lmb_in_range((lmb), \
34 &drmem_info->lmbs[0], \
35 &drmem_info->lmbs[drmem_info->n_lmbs - 1])
36
37 /*
38 * The of_drconf_cell_v1 struct defines the layout of the LMB data
39 * specified in the ibm,dynamic-memory device tree property.
40 * The property itself is a 32-bit value specifying the number of
41 * LMBs followed by an array of of_drconf_cell_v1 entries, one
42 * per LMB.
43 */
44 struct of_drconf_cell_v1 {
45 __be64 base_addr;
46 __be32 drc_index;
47 __be32 reserved;
48 __be32 aa_index;
49 __be32 flags;
50 };
51
52 /*
53 * Version 2 of the ibm,dynamic-memory property is defined as a
54 * 32-bit value specifying the number of LMB sets followed by an
55 * array of of_drconf_cell_v2 entries, one per LMB set.
56 */
57 struct of_drconf_cell_v2 {
58 u32 seq_lmbs;
59 u64 base_addr;
60 u32 drc_index;
61 u32 aa_index;
62 u32 flags;
63 } __packed;
64
65 #define DRCONF_MEM_ASSIGNED 0x00000008
66 #define DRCONF_MEM_AI_INVALID 0x00000040
67 #define DRCONF_MEM_RESERVED 0x00000080
68
drmem_lmb_size(void)69 static inline u32 drmem_lmb_size(void)
70 {
71 return drmem_info->lmb_size;
72 }
73
74 #define DRMEM_LMB_RESERVED 0x80000000
75
drmem_mark_lmb_reserved(struct drmem_lmb * lmb)76 static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
77 {
78 lmb->flags |= DRMEM_LMB_RESERVED;
79 }
80
drmem_remove_lmb_reservation(struct drmem_lmb * lmb)81 static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
82 {
83 lmb->flags &= ~DRMEM_LMB_RESERVED;
84 }
85
drmem_lmb_reserved(struct drmem_lmb * lmb)86 static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
87 {
88 return lmb->flags & DRMEM_LMB_RESERVED;
89 }
90
91 u64 drmem_lmb_memory_max(void);
92 void __init walk_drmem_lmbs(struct device_node *dn,
93 void (*func)(struct drmem_lmb *, const __be32 **));
94 int drmem_update_dt(void);
95
96 #ifdef CONFIG_PPC_PSERIES
97 void __init walk_drmem_lmbs_early(unsigned long node,
98 void (*func)(struct drmem_lmb *, const __be32 **));
99 #endif
100
invalidate_lmb_associativity_index(struct drmem_lmb * lmb)101 static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb)
102 {
103 lmb->aa_index = 0xffffffff;
104 }
105
106 #ifdef CONFIG_MEMORY_HOTPLUG
lmb_set_nid(struct drmem_lmb * lmb)107 static inline void lmb_set_nid(struct drmem_lmb *lmb)
108 {
109 lmb->nid = memory_add_physaddr_to_nid(lmb->base_addr);
110 }
lmb_clear_nid(struct drmem_lmb * lmb)111 static inline void lmb_clear_nid(struct drmem_lmb *lmb)
112 {
113 lmb->nid = -1;
114 }
115 #else
lmb_set_nid(struct drmem_lmb * lmb)116 static inline void lmb_set_nid(struct drmem_lmb *lmb)
117 {
118 }
lmb_clear_nid(struct drmem_lmb * lmb)119 static inline void lmb_clear_nid(struct drmem_lmb *lmb)
120 {
121 }
122 #endif
123
124 #endif /* _ASM_POWERPC_LMB_H */
125
