1 /*
2 * drmem.h: Power specific logical memory block representation
3 *
4 * Copyright 2017 IBM Corporation
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #ifndef _ASM_POWERPC_LMB_H
13 #define _ASM_POWERPC_LMB_H
14
15 #include <linux/sched.h>
16
17 struct drmem_lmb {
18 u64 base_addr;
19 u32 drc_index;
20 u32 aa_index;
21 u32 flags;
22 };
23
24 struct drmem_lmb_info {
25 struct drmem_lmb *lmbs;
26 int n_lmbs;
27 u64 lmb_size;
28 };
29
30 extern struct drmem_lmb_info *drmem_info;
31
drmem_lmb_next(struct drmem_lmb * lmb,const struct drmem_lmb * start)32 static inline struct drmem_lmb *drmem_lmb_next(struct drmem_lmb *lmb,
33 const struct drmem_lmb *start)
34 {
35 /*
36 * DLPAR code paths can take several milliseconds per element
37 * when interacting with firmware. Ensure that we don't
38 * unfairly monopolize the CPU.
39 */
40 if (((++lmb - start) % 16) == 0)
41 cond_resched();
42
43 return lmb;
44 }
45
46 #define for_each_drmem_lmb_in_range(lmb, start, end) \
47 for ((lmb) = (start); (lmb) < (end); lmb = drmem_lmb_next(lmb, start))
48
49 #define for_each_drmem_lmb(lmb) \
50 for_each_drmem_lmb_in_range((lmb), \
51 &drmem_info->lmbs[0], \
52 &drmem_info->lmbs[drmem_info->n_lmbs])
53
54 /*
55 * The of_drconf_cell_v1 struct defines the layout of the LMB data
56 * specified in the ibm,dynamic-memory device tree property.
57 * The property itself is a 32-bit value specifying the number of
58 * LMBs followed by an array of of_drconf_cell_v1 entries, one
59 * per LMB.
60 */
61 struct of_drconf_cell_v1 {
62 __be64 base_addr;
63 __be32 drc_index;
64 __be32 reserved;
65 __be32 aa_index;
66 __be32 flags;
67 };
68
69 /*
70 * Version 2 of the ibm,dynamic-memory property is defined as a
71 * 32-bit value specifying the number of LMB sets followed by an
72 * array of of_drconf_cell_v2 entries, one per LMB set.
73 */
74 struct of_drconf_cell_v2 {
75 u32 seq_lmbs;
76 u64 base_addr;
77 u32 drc_index;
78 u32 aa_index;
79 u32 flags;
80 } __packed;
81
82 #define DRCONF_MEM_ASSIGNED 0x00000008
83 #define DRCONF_MEM_AI_INVALID 0x00000040
84 #define DRCONF_MEM_RESERVED 0x00000080
85
drmem_lmb_size(void)86 static inline u64 drmem_lmb_size(void)
87 {
88 return drmem_info->lmb_size;
89 }
90
91 #define DRMEM_LMB_RESERVED 0x80000000
92
drmem_mark_lmb_reserved(struct drmem_lmb * lmb)93 static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
94 {
95 lmb->flags |= DRMEM_LMB_RESERVED;
96 }
97
drmem_remove_lmb_reservation(struct drmem_lmb * lmb)98 static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
99 {
100 lmb->flags &= ~DRMEM_LMB_RESERVED;
101 }
102
drmem_lmb_reserved(struct drmem_lmb * lmb)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 void __init walk_drmem_lmbs(struct device_node *dn,
110 void (*func)(struct drmem_lmb *, const __be32 **));
111 int drmem_update_dt(void);
112
113 #ifdef CONFIG_PPC_PSERIES
114 void __init walk_drmem_lmbs_early(unsigned long node,
115 void (*func)(struct drmem_lmb *, const __be32 **));
116 #endif
117
invalidate_lmb_associativity_index(struct drmem_lmb * lmb)118 static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb)
119 {
120 lmb->aa_index = 0xffffffff;
121 }
122
123 #endif /* _ASM_POWERPC_LMB_H */
124