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acpi: nfit: Add support for detect platform CPU cache flush on power loss

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In ACPI 6.2a the platform capability structure has been added to the NFIT
tables. That provides software the ability to determine whether a system
supports the auto flushing of CPU caches on power loss. If the capability
is supported, we do not need to do dax_flush(). Plumbing the path to set the
property on per region from the NFIT tables.

This patch depends on the ACPI NFIT 6.2a platform capabilities support code
in include/acpi/actbl1.h.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
This commit is contained in:
Dave Jiang
2018-01-31 12:45:38 -07:00
committed by Ross Zwisler
parent a7f2766ac7
commit 06e8ccdab1
4 changed files with 29 additions and 1 deletions
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5
include/linux/libnvdimm.h
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@@ -47,6 +47,11 @@ enum {
/* region flag indicating to direct-map persistent memory by default */
ND_REGION_PAGEMAP = 0,
/*
* Platform ensures entire CPU store data path is flushed to pmem on
* system power loss.
*/
ND_REGION_PERSIST_CACHE = 1,
/* mark newly adjusted resources as requiring a label update */
DPA_RESOURCE_ADJUSTED = 1 << 0,