From dc370b28c8425669e7ed5af4c01540645cfb00ec Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 1 Dec 2022 14:03:35 -0800 Subject: nvdimm/region: Move cache management to the region driver Now that cpu_cache_invalidate_memregion() is generically available, use it to centralize CPU cache management in the nvdimm region driver. This trades off removing redundant per-dimm CPU cache flushing with an opportunistic flush on every region disable event to cover the case of sensitive dirty data in the cache being written back to media after a secure erase / overwrite event. Reviewed-by: Davidlohr Bueso Reviewed-by: Dave Jiang Link: https://lore.kernel.org/r/166993221550.1995348.16843505129579060258.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Dan Williams --- include/linux/libnvdimm.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux') diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index 3bf658a74ccb..af38252ad704 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -35,6 +35,11 @@ enum { NDD_WORK_PENDING = 4, /* dimm supports namespace labels */ NDD_LABELING = 6, + /* + * dimm contents have changed requiring invalidation of CPU caches prior + * to activation of a region that includes this device + */ + NDD_INCOHERENT = 7, /* need to set a limit somewhere, but yes, this is likely overkill */ ND_IOCTL_MAX_BUFLEN = SZ_4M, -- cgit v1.2.3