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b43652d867
Extend cpu_cache_invalidate_memregion() to support invalidating a particular range of memory by introducing start and length parameters. Control of types of invalidation is left for when use cases turn up. For now everything is Clean and Invalidate. Where the range is unknown, use the provided cpu_cache_invalidate_all() helper to act as documentation of intent in a fashion that is clearer than passing (0, -1) to cpu_cache_invalidate_memregion(). Signed-off-by: Yicong Yang <yangyicong@hisilicon.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Davidlohr Bueso <dave@stgolabs.net> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* 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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* memregion
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* @start: start physical address of the target memory region.
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* @len: length of the target memory region. -1 for all the regions of
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* the target type.
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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(phys_addr_t start, size_t len);
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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(phys_addr_t start, size_t len)
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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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static inline int cpu_cache_invalidate_all(void)
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{
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return cpu_cache_invalidate_memregion(0, -1);
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}
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#endif /* _MEMREGION_H_ */
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