powerpc/pseries: Add driver for PAPR SCM regions

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Adds a driver that implements support for enabling and accessing PAPR
SCM regions. Unfortunately due to how the PAPR interface works we can't
use the existing of_pmem driver (yet) because:

 a) The guest is required to use the H_SCM_BIND_MEM h-call to add
    add the SCM region to it's physical address space, and
 b) There is currently no mechanism for relating a bare of_pmem region
    to the backing DIMM (or not-a-DIMM for our case).

Both of these are easily handled by rolling the functionality into a
seperate driver so here we are...

Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

This commit is contained in:

Oliver O'Halloran 2018-10-15 10:18:28 +11:00 • committed by Michael Ellerman

parent 4c5d87db49

commit b5beae5e22

3 changed files with 353 additions and 0 deletions

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7

arch/powerpc/platforms/pseries/Kconfig

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1

arch/powerpc/platforms/pseries/Makefile

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345

arch/powerpc/platforms/pseries/papr_scm.c

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