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Diffstat (limited to 'arch/powerpc/include/asm/drmem.h')
-rw-r--r-- | arch/powerpc/include/asm/drmem.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/drmem.h b/arch/powerpc/include/asm/drmem.h new file mode 100644 index 0000000000..13bf6dee8e --- /dev/null +++ b/arch/powerpc/include/asm/drmem.h @@ -0,0 +1,125 @@ +/* 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; + u64 lmb_size; +}; + +struct device_node; +struct property; + +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 +#define DRCONF_MEM_HOTREMOVABLE 0x00000100 + +static inline u64 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); +int walk_drmem_lmbs(struct device_node *dn, void *data, + int (*func)(struct drmem_lmb *, const __be32 **, void *)); +int drmem_update_dt(void); + +#ifdef CONFIG_PPC_PSERIES +int __init +walk_drmem_lmbs_early(unsigned long node, void *data, + int (*func)(struct drmem_lmb *, const __be32 **, void *)); +void drmem_update_lmbs(struct property *prop); +#endif + +static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb) +{ + lmb->aa_index = 0xffffffff; +} + +#endif /* _ASM_POWERPC_LMB_H */ |