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authorDave Jiang <dave.jiang@intel.com>2018-01-31 22:45:38 +0300
committerRoss Zwisler <ross.zwisler@linux.intel.com>2018-02-02 01:01:15 +0300
commit06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c (patch)
tree00ffd44862f319520b55d29e6b4a6feef60ffbe9 /drivers/nvdimm
parenta7f2766ac7c359216da4e714dc117c881e39a74a (diff)
downloadlinux-06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c.tar.xz
acpi: nfit: Add support for detect platform CPU cache flush on power loss
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>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/pmem.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 7fbc5c5dc8e1..8aa542398db4 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -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))) {