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 #include <linux/sched.h>
12
13 struct drmem_lmb {
14 u64 base_addr;
15 u32 drc_index;
16 u32 aa_index;
17 u32 flags;
18 };
19
20 struct drmem_lmb_info {
21 struct drmem_lmb *lmbs;
22 int n_lmbs;
23 u64 lmb_size;
24 };
25
26 struct device_node;
27 struct property;
28
29 extern struct drmem_lmb_info *drmem_info;
30
31 static inline struct drmem_lmb *drmem_lmb_next(struct drmem_lmb *lmb,
32 const struct drmem_lmb *start)
33 {
34 /*
35 * DLPAR code paths can take several milliseconds per element
36 * when interacting with firmware. Ensure that we don't
37 * unfairly monopolize the CPU.
38 */
39 if (((++lmb - start) % 16) == 0)
40 cond_resched();
41
42 return lmb;
43 }
44
45 #define for_each_drmem_lmb_in_range(lmb, start, end) \
46 for ((lmb) = (start); (lmb) < (end); lmb = drmem_lmb_next(lmb, start))
47
48 #define for_each_drmem_lmb(lmb) \
49 for_each_drmem_lmb_in_range((lmb), \
50 &drmem_info->lmbs[0], \
51 &drmem_info->lmbs[drmem_info->n_lmbs])
52
53 /*
54 * The of_drconf_cell_v1 struct defines the layout of the LMB data
55 * specified in the ibm,dynamic-memory device tree property.
56 * The property itself is a 32-bit value specifying the number of
57 * LMBs followed by an array of of_drconf_cell_v1 entries, one
58 * per LMB.
59 */
60 struct of_drconf_cell_v1 {
61 __be64 base_addr;
62 __be32 drc_index;
63 __be32 reserved;
64 __be32 aa_index;
65 __be32 flags;
66 };
67
68 /*
69 * Version 2 of the ibm,dynamic-memory property is defined as a
70 * 32-bit value specifying the number of LMB sets followed by an
71 * array of of_drconf_cell_v2 entries, one per LMB set.
72 */
73 struct of_drconf_cell_v2 {
74 u32 seq_lmbs;
75 u64 base_addr;
76 u32 drc_index;
77 u32 aa_index;
78 u32 flags;
79 } __packed;
80
81 #define DRCONF_MEM_ASSIGNED 0x00000008
82 #define DRCONF_MEM_AI_INVALID 0x00000040
83 #define DRCONF_MEM_RESERVED 0x00000080
84 #define DRCONF_MEM_HOTREMOVABLE 0x00000100
85
86 static inline u64 drmem_lmb_size(void)
87 {
88 return drmem_info->lmb_size;
89 }
90
91 #define DRMEM_LMB_RESERVED 0x80000000
92
93 static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
94 {
95 lmb->flags |= DRMEM_LMB_RESERVED;
96 }
97
98 static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
99 {
100 lmb->flags &= ~DRMEM_LMB_RESERVED;
101 }
102
103 static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
104 {
105 return lmb->flags & DRMEM_LMB_RESERVED;
106 }
107
108 u64 drmem_lmb_memory_max(void);
109 int walk_drmem_lmbs(struct device_node *dn, void *data,
110 int (*func)(struct drmem_lmb *, const __be32 **, void *));
111 int drmem_update_dt(void);
112
113 #ifdef CONFIG_PPC_PSERIES
114 int __init
115 walk_drmem_lmbs_early(unsigned long node, void *data,
116 int (*func)(struct drmem_lmb *, const __be32 **, void *));
117 void drmem_update_lmbs(struct property *prop);
118 #endif
119
120 static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb)
121 {
122 lmb->aa_index = 0xffffffff;
123 }
124
125 #endif /* _ASM_POWERPC_LMB_H */
126
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