| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_POWERPC_SPARSEMEM_H |
| 3 | #define _ASM_POWERPC_SPARSEMEM_H 1 |
| 4 | #ifdef __KERNEL__ |
| 5 | |
| 6 | #ifdef CONFIG_SPARSEMEM |
| 7 | /* |
| 8 | * SECTION_SIZE_BITS 2^N: how big each section will be |
| 9 | * MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space |
| 10 | */ |
| 11 | #define SECTION_SIZE_BITS 24 |
| 12 | /* |
| 13 | * If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS |
| 14 | * if we increase SECTIONS_WIDTH we will not store node details in page->flags and |
| 15 | * page_to_nid does a page->section->node lookup |
| 16 | * Hence only increase for VMEMMAP. |
| 17 | */ |
| 18 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 19 | #define MAX_PHYSMEM_BITS 47 |
| 20 | #else |
| 21 | #define MAX_PHYSMEM_BITS 46 |
| 22 | #endif |
| 23 | |
| 24 | #endif /* CONFIG_SPARSEMEM */ |
| 25 | |
| 26 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 27 | extern int create_section_mapping(unsigned long start, unsigned long end, int nid); |
| 28 | extern int remove_section_mapping(unsigned long start, unsigned long end); |
| 29 | |
| 30 | #ifdef CONFIG_PPC_BOOK3S_64 |
| 31 | extern void resize_hpt_for_hotplug(unsigned long new_mem_size); |
| 32 | #else |
| 33 | static inline void resize_hpt_for_hotplug(unsigned long new_mem_size) { } |
| 34 | #endif |
| 35 | |
| 36 | #ifdef CONFIG_NUMA |
| 37 | extern int hot_add_scn_to_nid(unsigned long scn_addr); |
| 38 | #else |
| 39 | static inline int hot_add_scn_to_nid(unsigned long scn_addr) |
| 40 | { |
| 41 | return 0; |
| 42 | } |
| 43 | #endif /* CONFIG_NUMA */ |
| 44 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 45 | |
| 46 | #endif /* __KERNEL__ */ |
| 47 | #endif /* _ASM_POWERPC_SPARSEMEM_H */ |