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