libnvdimm, pmem: use REQ_FUA, REQ_FLUSH for nvdimm_flush()

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Given that nvdimm_flush() has higher overhead than wmb_pmem() (pointer
chasing through nd_region), and that we otherwise assume a platform has
ADR capability when flush hints are not present, move nvdimm_flush() to
REQ_FLUSH context.

Note that we still arrange for nvdimm_flush() to be called even in the
ADR case. We need at least once wmb() fence to push buffered writes in
the cpu out to the ADR protected domain.

Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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Dan Williams 2016-06-01 20:48:15 -07:00

parent 0c27af60d1

commit 7e267a8c79

1 changed files with 12 additions and 4 deletions

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drivers/nvdimm/pmem.c

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