arch/powerpc/include/asm/drmem.h

   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 */