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 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 */