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memregion: Support fine grained invalidate by cpu_cache_invalidate_memregion() 

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>
pull/1354/merge
Yicong Yang 2025-11-17 10:47:55 +00:00 committed by Conor Dooley
parent f49ae86483
commit b43652d867
5 changed files with 18 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/mm/pat/set_memory.c
View File

@ -368,7 +368,7 @@ bool cpu_cache_has_invalidate_memregion(void)
}
EXPORT_SYMBOL_NS_GPL(cpu_cache_has_invalidate_memregion, "DEVMEM");
int cpu_cache_invalidate_memregion(void)
int cpu_cache_invalidate_memregion(phys_addr_t start, size_t len)
{
if (WARN_ON_ONCE(!cpu_cache_has_invalidate_memregion()))
return -ENXIO;

5
drivers/cxl/core/region.c
View File

@ -228,7 +228,10 @@ static int cxl_region_invalidate_memregion(struct cxl_region *cxlr)
return -ENXIO;
}
cpu_cache_invalidate_memregion();
if (!cxlr->params.res)
return -ENXIO;
cpu_cache_invalidate_memregion(cxlr->params.res->start,
resource_size(cxlr->params.res));
return 0;
}

2
drivers/nvdimm/region.c
View File

@ -110,7 +110,7 @@ static void nd_region_remove(struct device *dev)
* here is ok.
*/
if (cpu_cache_has_invalidate_memregion())
cpu_cache_invalidate_memregion();
cpu_cache_invalidate_all();
}
static int child_notify(struct device *dev, void *data)

2
drivers/nvdimm/region_devs.c
View File

@ -90,7 +90,7 @@ static int nd_region_invalidate_memregion(struct nd_region *nd_region)
}
}
cpu_cache_invalidate_memregion();
cpu_cache_invalidate_all();
out:
for (i = 0; i < nd_region->ndr_mappings; i++) {
struct nd_mapping *nd_mapping = &nd_region->mapping[i];

13
include/linux/memregion.h
View File

@ -27,6 +27,9 @@ static inline void memregion_free(int id)
/**
* 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.
@ -45,7 +48,7 @@ static inline void memregion_free(int id)
* the cache maintenance.
*/
#ifdef CONFIG_ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
int cpu_cache_invalidate_memregion(void);
int cpu_cache_invalidate_memregion(phys_addr_t start, size_t len);
bool cpu_cache_has_invalidate_memregion(void);
#else
static inline bool cpu_cache_has_invalidate_memregion(void)
@ -53,10 +56,16 @@ static inline bool cpu_cache_has_invalidate_memregion(void)
return false;
}
static inline int cpu_cache_invalidate_memregion(void)
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_ */