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 extern struct drmem_lmb_info *drmem_info; 27 28 static 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 */ 57 struct 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 */ 70 struct 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 83 static inline u64 drmem_lmb_size(void) 84 { 85 return drmem_info->lmb_size; 86 } 87 88 #define DRMEM_LMB_RESERVED 0x80000000 89 90 static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb) 91 { 92 lmb->flags |= DRMEM_LMB_RESERVED; 93 } 94 95 static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb) 96 { 97 lmb->flags &= ~DRMEM_LMB_RESERVED; 98 } 99 100 static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb) 101 { 102 return lmb->flags & DRMEM_LMB_RESERVED; 103 } 104 105 u64 drmem_lmb_memory_max(void); 106 int walk_drmem_lmbs(struct device_node *dn, void *data, 107 int (*func)(struct drmem_lmb *, const __be32 **, void *)); 108 int drmem_update_dt(void); 109 110 #ifdef CONFIG_PPC_PSERIES 111 int __init 112 walk_drmem_lmbs_early(unsigned long node, void *data, 113 int (*func)(struct drmem_lmb *, const __be32 **, void *)); 114 void drmem_update_lmbs(struct property *prop); 115 #endif 116 117 static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb) 118 { 119 lmb->aa_index = 0xffffffff; 120 } 121 122 #endif /* _ASM_POWERPC_LMB_H */ 123