| /* 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 */ |
