powerpc/papr_scm: Implement support for H_SCM_FLUSH hcall

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Add support for ND_REGION_ASYNC capability if the device tree
indicates 'ibm,hcall-flush-required' property in the NVDIMM node.
Flush is done by issuing H_SCM_FLUSH hcall to the hypervisor.

If the flush request failed, the hypervisor is expected to
to reflect the problem in the subsequent nvdimm H_SCM_HEALTH call.

This patch prevents mmap of namespaces with MAP_SYNC flag if the
nvdimm requires an explicit flush[1].

References:
[1] https://github.com/avocado-framework-tests/avocado-misc-tests/blob/master/memory/ndctl.py.data/map_sync.c

Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
[mpe: Use unsigned long / long instead of uint64_t/int64_t]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/161703936121.36.7260632399582101498.stgit@e1fbed493c87

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Shivaprasad G Bhat 2021-03-29 13:36:43 -04:00 • committed by Michael Ellerman

parent af072b1a9d

commit 75b7c05ebf

3 changed files with 55 additions and 1 deletions

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14

Documentation/powerpc/papr_hcalls.rst

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3

arch/powerpc/include/asm/hvcall.h

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39

arch/powerpc/platforms/pseries/papr_scm.c

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