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33dd7075 DW |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _MEMREGION_H_ | |
3 | #define _MEMREGION_H_ | |
4 | #include <linux/types.h> | |
5 | #include <linux/errno.h> | |
fe098574 | 6 | #include <linux/range.h> |
1156b441 | 7 | #include <linux/bug.h> |
33dd7075 | 8 | |
a6c7f4c6 DW |
9 | struct memregion_info { |
10 | int target_node; | |
fe098574 | 11 | struct range range; |
a6c7f4c6 DW |
12 | }; |
13 | ||
33dd7075 DW |
14 | #ifdef CONFIG_MEMREGION |
15 | int memregion_alloc(gfp_t gfp); | |
16 | void memregion_free(int id); | |
17 | #else | |
18 | static inline int memregion_alloc(gfp_t gfp) | |
19 | { | |
20 | return -ENOMEM; | |
21 | } | |
f50974ee | 22 | static inline void memregion_free(int id) |
33dd7075 DW |
23 | { |
24 | } | |
25 | #endif | |
1156b441 DB |
26 | |
27 | /** | |
28 | * cpu_cache_invalidate_memregion - drop any CPU cached data for | |
29 | * memregions described by @res_desc | |
30 | * @res_desc: one of the IORES_DESC_* types | |
31 | * | |
32 | * Perform cache maintenance after a memory event / operation that | |
33 | * changes the contents of physical memory in a cache-incoherent manner. | |
34 | * For example, device memory technologies like NVDIMM and CXL have | |
35 | * device secure erase, and dynamic region provision that can replace | |
36 | * the memory mapped to a given physical address. | |
37 | * | |
38 | * Limit the functionality to architectures that have an efficient way | |
39 | * to writeback and invalidate potentially terabytes of address space at | |
40 | * once. Note that this routine may or may not write back any dirty | |
41 | * contents while performing the invalidation. It is only exported for | |
42 | * the explicit usage of the NVDIMM and CXL modules in the 'DEVMEM' | |
43 | * symbol namespace on bare platforms. | |
44 | * | |
45 | * Returns 0 on success or negative error code on a failure to perform | |
46 | * the cache maintenance. | |
47 | */ | |
48 | #ifdef CONFIG_ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION | |
49 | int cpu_cache_invalidate_memregion(int res_desc); | |
50 | bool cpu_cache_has_invalidate_memregion(void); | |
51 | #else | |
52 | static inline bool cpu_cache_has_invalidate_memregion(void) | |
53 | { | |
54 | return false; | |
55 | } | |
56 | ||
57 | static inline int cpu_cache_invalidate_memregion(int res_desc) | |
58 | { | |
59 | WARN_ON_ONCE("CPU cache invalidation required"); | |
60 | return -ENXIO; | |
61 | } | |
62 | #endif | |
33dd7075 | 63 | #endif /* _MEMREGION_H_ */ |