pmem: add copy_from_iter_pmem() and clear_pmem()

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Add support for two new PMEM APIs, copy_from_iter_pmem() and
clear_pmem().  copy_from_iter_pmem() is used to copy data from an
iterator into a PMEM buffer.  clear_pmem() zeros a PMEM memory range.

Both of these new APIs must be explicitly ordered using a wmb_pmem()
function call and are implemented in such a way that the wmb_pmem()
will make the stores to PMEM durable.  Because both APIs are unordered
they can be called as needed without introducing any unwanted memory
barriers.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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Ross Zwisler 2015-08-18 13:55:39 -06:00 • committed by Dan Williams

parent 4a370df553

commit 5de490daec

2 changed files with 137 additions and 2 deletions

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75

arch/x86/include/asm/pmem.h

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64

include/linux/pmem.h

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