64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _MEMREGION_H_
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#define _MEMREGION_H_
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/range.h>
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#include <linux/bug.h>
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struct memregion_info {
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int target_node;
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struct range range;
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};
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#ifdef CONFIG_MEMREGION
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int memregion_alloc(gfp_t gfp);
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void memregion_free(int id);
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#else
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static inline int memregion_alloc(gfp_t gfp)
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{
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return -ENOMEM;
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}
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static inline void memregion_free(int id)
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{
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}
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#endif
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/**
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* cpu_cache_invalidate_memregion - drop any CPU cached data for
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* memregions described by @res_desc
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* @res_desc: one of the IORES_DESC_* types
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*
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* Perform cache maintenance after a memory event / operation that
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* changes the contents of physical memory in a cache-incoherent manner.
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* For example, device memory technologies like NVDIMM and CXL have
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* device secure erase, and dynamic region provision that can replace
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* the memory mapped to a given physical address.
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*
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* Limit the functionality to architectures that have an efficient way
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* to writeback and invalidate potentially terabytes of address space at
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* once. Note that this routine may or may not write back any dirty
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* contents while performing the invalidation. It is only exported for
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* the explicit usage of the NVDIMM and CXL modules in the 'DEVMEM'
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* symbol namespace on bare platforms.
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*
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* Returns 0 on success or negative error code on a failure to perform
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* the cache maintenance.
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*/
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#ifdef CONFIG_ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
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int cpu_cache_invalidate_memregion(int res_desc);
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bool cpu_cache_has_invalidate_memregion(void);
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#else
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static inline bool cpu_cache_has_invalidate_memregion(void)
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{
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return false;
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}
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static inline int cpu_cache_invalidate_memregion(int res_desc)
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{
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WARN_ON_ONCE("CPU cache invalidation required");
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return -ENXIO;
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}
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#endif
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#endif /* _MEMREGION_H_ */
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