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
26extern struct drmem_lmb_info *drmem_info;
27
28static 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 */
57struct 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 */
70struct 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
83static inline u64 drmem_lmb_size(void)
84{
85	return drmem_info->lmb_size;
86}
87
88#define DRMEM_LMB_RESERVED	0x80000000
89
90static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
91{
92	lmb->flags |= DRMEM_LMB_RESERVED;
93}
94
95static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
96{
97	lmb->flags &= ~DRMEM_LMB_RESERVED;
98}
99
100static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
101{
102	return lmb->flags & DRMEM_LMB_RESERVED;
103}
104
105u64 drmem_lmb_memory_max(void);
106int walk_drmem_lmbs(struct device_node *dn, void *data,
107		    int (*func)(struct drmem_lmb *, const __be32 **, void *));
108int drmem_update_dt(void);
109
110#ifdef CONFIG_PPC_PSERIES
111int __init
112walk_drmem_lmbs_early(unsigned long node, void *data,
113		      int (*func)(struct drmem_lmb *, const __be32 **, void *));
114#endif
115
116static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb)
117{
118	lmb->aa_index = 0xffffffff;
119}
120
121#endif /* _ASM_POWERPC_LMB_H */
122