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