LXR linux/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
  13struct drmem_lmb {
  14        u64     base_addr;
  15        u32     drc_index;
  16        u32     aa_index;
  17        u32     flags;
  18};
  19
  20struct drmem_lmb_info {
  21        struct drmem_lmb        *lmbs;
  22        int                     n_lmbs;
  23        u64                     lmb_size;
  24};
  25
  26extern struct drmem_lmb_info *drmem_info;
  27
  28static 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 */
  57struct 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 */
  70struct 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
  83static inline u64 drmem_lmb_size(void)
  84{
  85        return drmem_info->lmb_size;
  86}
  87
  88#define DRMEM_LMB_RESERVED      0x80000000
  89
  90static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
  91{
  92        lmb->flags |= DRMEM_LMB_RESERVED;
  93}
  94
  95static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
  96{
  97        lmb->flags &= ~DRMEM_LMB_RESERVED;
  98}
  99
 100static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
 101{
 102        return lmb->flags & DRMEM_LMB_RESERVED;
 103}
 104
 105u64 drmem_lmb_memory_max(void);
 106int walk_drmem_lmbs(struct device_node *dn, void *data,
 107                    int (*func)(struct drmem_lmb *, const __be32 **, void *));
 108int drmem_update_dt(void);
 109
 110#ifdef CONFIG_PPC_PSERIES
 111int __init
 112walk_drmem_lmbs_early(unsigned long node, void *data,
 113                      int (*func)(struct drmem_lmb *, const __be32 **, void *));
 114void drmem_update_lmbs(struct property *prop);
 115#endif
 116
 117static 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