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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_SPARSEMEM_H
#define _ASM_POWERPC_SPARSEMEM_H 1
#ifdef __KERNEL__
#ifdef CONFIG_SPARSEMEM
/*
* SECTION_SIZE_BITS 2^N: how big each section will be
* MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
*/
#define SECTION_SIZE_BITS 24
/*
* If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS
* if we increase SECTIONS_WIDTH we will not store node details in page->flags and
* page_to_nid does a page->section->node lookup
* Hence only increase for VMEMMAP.
*/
#ifdef CONFIG_SPARSEMEM_VMEMMAP
#define MAX_PHYSMEM_BITS 47
#else
#define MAX_PHYSMEM_BITS 46
#endif
#endif /* CONFIG_SPARSEMEM */
#ifdef CONFIG_MEMORY_HOTPLUG
extern int create_section_mapping(unsigned long start, unsigned long end, int nid);
extern int remove_section_mapping(unsigned long start, unsigned long end);
#ifdef CONFIG_PPC_BOOK3S_64
extern void resize_hpt_for_hotplug(unsigned long new_mem_size);
#else
static inline void resize_hpt_for_hotplug(unsigned long new_mem_size) { }
#endif
#ifdef CONFIG_NUMA
extern int hot_add_scn_to_nid(unsigned long scn_addr);
#else
static inline int hot_add_scn_to_nid(unsigned long scn_addr)
{
return 0;
}
#endif /* CONFIG_NUMA */
#endif /* CONFIG_MEMORY_HOTPLUG */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_SPARSEMEM_H */
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