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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172/* SPDX-License-Identifier: GPL-2.0 */#ifndef _MEMREGION_H_#define _MEMREGION_H_#include <linux/types.h>#include <linux/errno.h>#include <linux/range.h>#include <linux/bug.h>
struct memregion_info { int target_node; struct range range;};
#ifdef CONFIG_MEMREGIONint memregion_alloc(gfp_t gfp);void memregion_free(int id);#elsestatic inline int memregion_alloc(gfp_t gfp){ return -ENOMEM;}static inline void memregion_free(int id){}#endif
/** * cpu_cache_invalidate_memregion - drop any CPU cached data for * memregion * @start: start physical address of the target memory region. * @len: length of the target memory region. -1 for all the regions of * the target type. * * Perform cache maintenance after a memory event / operation that * changes the contents of physical memory in a cache-incoherent manner. * For example, device memory technologies like NVDIMM and CXL have * device secure erase, and dynamic region provision that can replace * the memory mapped to a given physical address. * * Limit the functionality to architectures that have an efficient way * to writeback and invalidate potentially terabytes of address space at * once. Note that this routine may or may not write back any dirty * contents while performing the invalidation. It is only exported for * the explicit usage of the NVDIMM and CXL modules in the 'DEVMEM' * symbol namespace on bare platforms. * * Returns 0 on success or negative error code on a failure to perform * the cache maintenance. */#ifdef CONFIG_ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGIONint cpu_cache_invalidate_memregion(phys_addr_t start, size_t len);bool cpu_cache_has_invalidate_memregion(void);#elsestatic inline bool cpu_cache_has_invalidate_memregion(void){ return false;}
static inline int cpu_cache_invalidate_memregion(phys_addr_t start, size_t len){ WARN_ON_ONCE("CPU cache invalidation required"); return -ENXIO;}#endif
static inline int cpu_cache_invalidate_all(void){ return cpu_cache_invalidate_memregion(0, -1);}
#endif /* _MEMREGION_H_ */