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 */