1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * drmem.h: Power specific logical memory block representation
5 * Copyright 2017 IBM Corporation
8 #ifndef _ASM_POWERPC_LMB_H
9 #define _ASM_POWERPC_LMB_H
11 #include <linux/sched.h>
20 struct drmem_lmb_info {
21 struct drmem_lmb *lmbs;
26 extern struct drmem_lmb_info *drmem_info;
28 static inline struct drmem_lmb *drmem_lmb_next(struct drmem_lmb *lmb,
29 const struct drmem_lmb *start)
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.
36 if (((++lmb - start) % 16) == 0)
42 #define for_each_drmem_lmb_in_range(lmb, start, end) \
43 for ((lmb) = (start); (lmb) < (end); lmb = drmem_lmb_next(lmb, start))
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])
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
57 struct of_drconf_cell_v1 {
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.
70 struct of_drconf_cell_v2 {
78 #define DRCONF_MEM_ASSIGNED 0x00000008
79 #define DRCONF_MEM_AI_INVALID 0x00000040
80 #define DRCONF_MEM_RESERVED 0x00000080
82 static inline u64 drmem_lmb_size(void)
84 return drmem_info->lmb_size;
87 #define DRMEM_LMB_RESERVED 0x80000000
89 static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
91 lmb->flags |= DRMEM_LMB_RESERVED;
94 static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
96 lmb->flags &= ~DRMEM_LMB_RESERVED;
99 static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
101 return lmb->flags & DRMEM_LMB_RESERVED;
104 u64 drmem_lmb_memory_max(void);
105 void __init walk_drmem_lmbs(struct device_node *dn,
106 void (*func)(struct drmem_lmb *, const __be32 **));
107 int drmem_update_dt(void);
109 #ifdef CONFIG_PPC_PSERIES
110 void __init walk_drmem_lmbs_early(unsigned long node,
111 void (*func)(struct drmem_lmb *, const __be32 **));
114 static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb)
116 lmb->aa_index = 0xffffffff;
119 #endif /* _ASM_POWERPC_LMB_H */