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