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| author |   Dave Jiang <dave.jiang@intel.com> | 2018-01-31 12:45:38 -0700 |
|---|---|---|
| committer |   Ross Zwisler <ross.zwisler@linux.intel.com> | 2018-02-01 15:01:15 -0700 |
| commit | 06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c (patch) | |
| tree | 00ffd44862f319520b55d29e6b4a6feef60ffbe9 /drivers/nvdimm/pmem.c | |
| parent | Merge branches 'acpi-gpio', 'acpi-button', 'acpi-battery' and 'acpi-video' (diff) | |
| download | linux-dev-06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c.tar.xz linux-dev-06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c.zip | |
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/pmem.c')
| -rw-r--r-- | drivers/nvdimm/pmem.c | 4 |
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))) { |