tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
15struct drmem_lmb {
16 u64 base_addr;
17 u32 drc_index;
18 u32 aa_index;
19 u32 flags;
20};
21
22struct drmem_lmb_info {
23 struct drmem_lmb *lmbs;
24 int n_lmbs;
25 u32 lmb_size;
26};
27
28extern struct drmem_lmb_info *drmem_info;
29
30#define for_each_drmem_lmb_in_range(lmb, start, end) \
31 for ((lmb) = (start); (lmb) <= (end); (lmb)++)
32
33#define for_each_drmem_lmb(lmb) \
34 for_each_drmem_lmb_in_range((lmb), \
35 &drmem_info->lmbs[0], \
36 &drmem_info->lmbs[drmem_info->n_lmbs - 1])
37
38/*
39 * The of_drconf_cell_v1 struct defines the layout of the LMB data
40 * specified in the ibm,dynamic-memory device tree property.
41 * The property itself is a 32-bit value specifying the number of
42 * LMBs followed by an array of of_drconf_cell_v1 entries, one
43 * per LMB.
44 */
45struct of_drconf_cell_v1 {
46 __be64 base_addr;
47 __be32 drc_index;
48 __be32 reserved;
49 __be32 aa_index;
50 __be32 flags;
51};
52
53/*
54 * Version 2 of the ibm,dynamic-memory property is defined as a
55 * 32-bit value specifying the number of LMB sets followed by an
56 * array of of_drconf_cell_v2 entries, one per LMB set.
57 */
58struct of_drconf_cell_v2 {
59 u32 seq_lmbs;
60 u64 base_addr;
61 u32 drc_index;
62 u32 aa_index;
63 u32 flags;
64} __packed;
65
66#define DRCONF_MEM_ASSIGNED 0x00000008
67#define DRCONF_MEM_AI_INVALID 0x00000040
68#define DRCONF_MEM_RESERVED 0x00000080
69
70static inline u32 drmem_lmb_size(void)
71{
72 return drmem_info->lmb_size;
73}
74
75#define DRMEM_LMB_RESERVED 0x80000000
76
77static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
78{
79 lmb->flags |= DRMEM_LMB_RESERVED;
80}
81
82static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
83{
84 lmb->flags &= ~DRMEM_LMB_RESERVED;
85}
86
87static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
88{
89 return lmb->flags & DRMEM_LMB_RESERVED;
90}
91
92u64 drmem_lmb_memory_max(void);
93void __init walk_drmem_lmbs(struct device_node *dn,
94 void (*func)(struct drmem_lmb *, const __be32 **));
95int drmem_update_dt(void);
96
97#ifdef CONFIG_PPC_PSERIES
98void __init walk_drmem_lmbs_early(unsigned long node,
99 void (*func)(struct drmem_lmb *, const __be32 **));
100#endif
101
102#endif /* _ASM_POWERPC_LMB_H */