libnvdimm, region: update nd_region_available_dpa() for multi-pmem support

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The free dpa (dimm-physical-address) space calculation reports how much
free space is available with consideration for aliased BLK + PMEM
regions.  Recall that BLK capacity is allocated from high addresses and
PMEM is allocated from low addresses in their respective regions.

nd_region_available_dpa() accounts for the fact that the largest
encroachment (lowest starting address) into PMEM capacity by a BLK
allocation limits the available capacity to that point, regardless if
there is BLK allocation hole at a higher address.  Similarly, for the
multi-pmem case we need to track the largest encroachment (highest
 ending address) of a PMEM allocation in BLK capacity regardless of
whether there is an allocation hole that a BLK allocation could fill at
a lower address.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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This commit is contained in:

Dan Williams 2016-09-30 17:28:58 -07:00

parent 6ff3e912d3

commit a1f3e4d6a0

3 changed files with 139 additions and 42 deletions

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174

drivers/nvdimm/dimm_devs.c

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2

drivers/nvdimm/nd-core.h

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5

drivers/nvdimm/region_devs.c

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