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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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4
drivers/nvdimm/pmem.c
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@@ -35,6 +35,7 @@
#include "pmem.h"
#include "pfn.h"
#include "nd.h"
#include "nd-core.h"
static struct device *to_dev(struct pmem_device *pmem)
{
@@ -334,7 +335,8 @@ static int pmem_attach_disk(struct device *dev,
dev_warn(dev, "unable to guarantee persistence of writes\n");
fua = 0;
}
wbc = nvdimm_has_cache(nd_region);
wbc = nvdimm_has_cache(nd_region) &&
!test_bit(ND_REGION_PERSIST_CACHE, &nd_region->flags);
if (!devm_request_mem_region(dev, res->start, resource_size(res),
dev_name(&ndns->dev))) {