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
13struct drmem_lmb {
14	u64     base_addr;
15	u32     drc_index;
16	u32     aa_index;
17	u32     flags;
18};
19
20struct drmem_lmb_info {
21	struct drmem_lmb        *lmbs;
22	int                     n_lmbs;
23	u64                     lmb_size;
24};
25
26struct device_node;
27struct property;
28
29extern struct drmem_lmb_info *drmem_info;
30
31static 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 */
60struct 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 */
73struct 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
86static inline u64 drmem_lmb_size(void)
87{
88	return drmem_info->lmb_size;
89}
90
91#define DRMEM_LMB_RESERVED	0x80000000
92
93static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
94{
95	lmb->flags |= DRMEM_LMB_RESERVED;
96}
97
98static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
99{
100	lmb->flags &= ~DRMEM_LMB_RESERVED;
101}
102
103static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
104{
105	return lmb->flags & DRMEM_LMB_RESERVED;
106}
107
108u64 drmem_lmb_memory_max(void);
109int walk_drmem_lmbs(struct device_node *dn, void *data,
110		    int (*func)(struct drmem_lmb *, const __be32 **, void *));
111int drmem_update_dt(void);
112
113#ifdef CONFIG_PPC_PSERIES
114int __init
115walk_drmem_lmbs_early(unsigned long node, void *data,
116		      int (*func)(struct drmem_lmb *, const __be32 **, void *));
117void drmem_update_lmbs(struct property *prop);
118#endif
119
120static 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