1 /* SPDX-License-Identifier: GPL-2.0 */
4 #include <linux/types.h>
5 #include <linux/errno.h>
8 struct memregion_info {
12 #ifdef CONFIG_MEMREGION
13 int memregion_alloc(gfp_t gfp);
14 void memregion_free(int id);
16 static inline int memregion_alloc(gfp_t gfp)
20 static inline void memregion_free(int id)
26 * cpu_cache_invalidate_memregion - drop any CPU cached data for
27 * memregions described by @res_desc
28 * @res_desc: one of the IORES_DESC_* types
30 * Perform cache maintenance after a memory event / operation that
31 * changes the contents of physical memory in a cache-incoherent manner.
32 * For example, device memory technologies like NVDIMM and CXL have
33 * device secure erase, and dynamic region provision that can replace
34 * the memory mapped to a given physical address.
36 * Limit the functionality to architectures that have an efficient way
37 * to writeback and invalidate potentially terabytes of address space at
38 * once. Note that this routine may or may not write back any dirty
39 * contents while performing the invalidation. It is only exported for
40 * the explicit usage of the NVDIMM and CXL modules in the 'DEVMEM'
41 * symbol namespace on bare platforms.
43 * Returns 0 on success or negative error code on a failure to perform
44 * the cache maintenance.
46 #ifdef CONFIG_ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
47 int cpu_cache_invalidate_memregion(int res_desc);
48 bool cpu_cache_has_invalidate_memregion(void);
50 static inline bool cpu_cache_has_invalidate_memregion(void)
55 static inline int cpu_cache_invalidate_memregion(int res_desc)
57 WARN_ON_ONCE("CPU cache invalidation required");
61 #endif /* _MEMREGION_H_ */