126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* drmem.h: Power specific logical memory block representation
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*
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* Copyright 2017 IBM Corporation
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*/
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#ifndef _ASM_POWERPC_LMB_H
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#define _ASM_POWERPC_LMB_H
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#include <linux/sched.h>
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struct drmem_lmb {
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u64 base_addr;
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u32 drc_index;
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u32 aa_index;
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u32 flags;
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};
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struct drmem_lmb_info {
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struct drmem_lmb *lmbs;
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int n_lmbs;
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u64 lmb_size;
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};
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struct device_node;
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struct property;
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extern struct drmem_lmb_info *drmem_info;
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static inline struct drmem_lmb *drmem_lmb_next(struct drmem_lmb *lmb,
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const struct drmem_lmb *start)
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{
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/*
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* DLPAR code paths can take several milliseconds per element
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* when interacting with firmware. Ensure that we don't
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* unfairly monopolize the CPU.
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*/
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if (((++lmb - start) % 16) == 0)
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cond_resched();
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return lmb;
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}
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#define for_each_drmem_lmb_in_range(lmb, start, end) \
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for ((lmb) = (start); (lmb) < (end); lmb = drmem_lmb_next(lmb, start))
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#define for_each_drmem_lmb(lmb) \
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for_each_drmem_lmb_in_range((lmb), \
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&drmem_info->lmbs[0], \
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&drmem_info->lmbs[drmem_info->n_lmbs])
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/*
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* The of_drconf_cell_v1 struct defines the layout of the LMB data
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* specified in the ibm,dynamic-memory device tree property.
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* The property itself is a 32-bit value specifying the number of
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* LMBs followed by an array of of_drconf_cell_v1 entries, one
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* per LMB.
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*/
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struct of_drconf_cell_v1 {
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__be64 base_addr;
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__be32 drc_index;
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__be32 reserved;
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__be32 aa_index;
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__be32 flags;
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};
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/*
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* Version 2 of the ibm,dynamic-memory property is defined as a
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* 32-bit value specifying the number of LMB sets followed by an
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* array of of_drconf_cell_v2 entries, one per LMB set.
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*/
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struct of_drconf_cell_v2 {
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u32 seq_lmbs;
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u64 base_addr;
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u32 drc_index;
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u32 aa_index;
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u32 flags;
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} __packed;
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#define DRCONF_MEM_ASSIGNED 0x00000008
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#define DRCONF_MEM_AI_INVALID 0x00000040
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#define DRCONF_MEM_RESERVED 0x00000080
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#define DRCONF_MEM_HOTREMOVABLE 0x00000100
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static inline u64 drmem_lmb_size(void)
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{
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return drmem_info->lmb_size;
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}
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#define DRMEM_LMB_RESERVED 0x80000000
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static inline void drmem_mark_lmb_reserved(struct drmem_lmb *lmb)
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{
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lmb->flags |= DRMEM_LMB_RESERVED;
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}
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static inline void drmem_remove_lmb_reservation(struct drmem_lmb *lmb)
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{
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lmb->flags &= ~DRMEM_LMB_RESERVED;
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}
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static inline bool drmem_lmb_reserved(struct drmem_lmb *lmb)
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{
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return lmb->flags & DRMEM_LMB_RESERVED;
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}
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u64 drmem_lmb_memory_max(void);
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int walk_drmem_lmbs(struct device_node *dn, void *data,
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int (*func)(struct drmem_lmb *, const __be32 **, void *));
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int drmem_update_dt(void);
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#ifdef CONFIG_PPC_PSERIES
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int __init
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walk_drmem_lmbs_early(unsigned long node, void *data,
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int (*func)(struct drmem_lmb *, const __be32 **, void *));
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void drmem_update_lmbs(struct property *prop);
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#endif
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static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb)
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{
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lmb->aa_index = 0xffffffff;
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}
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#endif /* _ASM_POWERPC_LMB_H */
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