The interleave set cookie is used to determine if a label stored in the
metadata space should be applied to the current region. This is
important in the case of NVDIMMs since the firmware may change the
interleaving configuration of a DIMM which would invalidate the existing
labels. In our case the hypervisor hides those details from us so we
don't really care, but libnvdimm still requires the interleave set
cookie to be non-zero.

For our purposes we just need the set cookie to be unique and fixed for
a given PAPR SCM region and using the unit-guid (really a UUID) is fine
for this purpose.

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
[mpe: Use kernel types (u64)]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

When a new nvdimm device is registered with libnvdimm via
nvdimm_create() it is added as a device on the nvdimm bus. The probe
function for the DIMM driver is potentially quite slow so actually
registering and probing the device is done in an async domain rather
than immediately after device creation. This can result in a race where
the region device (created 2nd) is probed first and fails to activate at
boot.

To fix this we use the same approach as the ACPI/NFIT driver which is to
check that all the DIMM devices registered successfully. LibNVDIMM
provides the nvdimm_bus_count_dimms() function which synchronises with
the async domain and verifies that the dimm was successfully registered
with the bus.

If either of these does not occur then we bail.

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

The return values of a h-call are returned in the CPU registers and
written to the provided buffer by the plpar_hcall() wrapper. As a result
the values written to memory are always in the native endian and should
not be byte swapped.

The inital implementation of the H-Call interface was done in qemu and
the returned values were byte swapped unnecessarily in both the
hypervisor and in the driver so this was only noticed when bringing up
the PowerVM implementation.

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

The ibm,unit-sizes property was originally specified as an array of two
u32s corresponding to the memory block size, and the number of blocks
available in that region. A fairly last-minute change to the SCM DT
specification was splitting that into two seperate u64 properties:
ibm,block-sizes and ibm,number-of-blocks that convey the same
information. No firmware / hypervisor that emitted the ibm,unit-size
property ever appeared in the wild.

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
[mpe: Use kernel types (u32/u64)]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Fix an off-by-one error in the memory resource range. This resource is
used to determine the address range of the memory to be hot-plugged as
ZONE_DEVICE memory. The current end address results in the kernel
attempting to map an additional memblock and the hypervisor may reject
the mapping resulting in the entire hot-plug failing.

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Making PAPR_SCM select LIBNVDIMM results in circular dependencies in
Kconfig when another symbol depends on it. Fix this by replacing the
select with a depends.

Fixes: b5beae5e224f ("powerpc/pseries: Add driver for PAPR SCM regions")
Reported-by: Alastair D'Silva <alastair@d-silva.org>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

The NPU IOMMU is setup to mirror the parent PCIe device IOMMU
setup. Therefore it does not make sense to call dma operations such as
dma_map_page(), etc. directly on these devices. The existing dma_ops
simply print a warning if they are ever called, however this is
unnecessary and the warnings are likely to go unnoticed.

It is instead simpler to remove these operations and let the generic
DMA code print warnings (eg. via a NULL pointer deref) in cases of
buggy drivers attempting dma operations on NVLink devices.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

Pull Kbuild updates from Masahiro Yamada:

 - clean-up leftovers in Kconfig files

 - remove stale oldnoconfig and silentoldconfig targets

 - remove unneeded cc-fullversion and cc-name variables

 - improve merge_config script to allow overriding option prefix

* tag 'kbuild-v4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: remove cc-name variable
  kbuild: replace cc-name test with CONFIG_CC_IS_CLANG
  merge_config.sh: Allow to define config prefix
  kbuild: remove unused cc-fullversion variable
  kconfig: remove silentoldconfig target
  kconfig: remove oldnoconfig target
  powerpc: PCI_MSI needs PCI
  powerpc: remove CONFIG_MCA leftovers
  powerpc: remove CONFIG_PCI_QSPAN
  scsi: aha152x: rename the PCMCIA define

Pull powerpc fixes from Michael Ellerman:
 "Some things that I missed due to travel, or that came in late.

  Two fixes also going to stable:

   - A revert of a buggy change to the 8xx TLB miss handlers.

   - Our flushing of SPE (Signal Processing Engine) registers on fork
     was broken.

  Other changes:

   - A change to the KVM decrementer emulation to use proper APIs.

   - Some cleanups to the way we do code patching in the 8xx code.

   - Expose the maximum possible memory for the system in
     /proc/powerpc/lparcfg.

   - Merge some updates from Scott: "a couple device tree updates, and a
     fix for a missing prototype warning"

  A few other minor fixes and a handful of fixes for our selftests.

  Thanks to: Aravinda Prasad, Breno Leitao, Camelia Groza, Christophe
  Leroy, Felipe Rechia, Joel Stanley, Naveen N. Rao, Paul Mackerras,
  Scott Wood, Tyrel Datwyler"

* tag 'powerpc-4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (21 commits)
  selftests/powerpc: Fix compilation issue due to asm label
  selftests/powerpc/cache_shape: Fix out-of-tree build
  selftests/powerpc/switch_endian: Fix out-of-tree build
  selftests/powerpc/pmu: Link ebb tests with -no-pie
  selftests/powerpc/signal: Fix out-of-tree build
  selftests/powerpc/ptrace: Fix out-of-tree build
  powerpc/xmon: Relax frame size for clang
  selftests: powerpc: Fix warning for security subdir
  selftests/powerpc: Relax L1d miss targets for rfi_flush test
  powerpc/process: Fix flush_all_to_thread for SPE
  powerpc/pseries: add missing cpumask.h include file
  selftests/powerpc: Fix ptrace tm failure
  KVM: PPC: Use exported tb_to_ns() function in decrementer emulation
  powerpc/pseries: Export maximum memory value
  powerpc/8xx: Use patch_site for perf counters setup
  powerpc/8xx: Use patch_site for memory setup patching
  powerpc/code-patching: Add a helper to get the address of a patch_site
  Revert "powerpc/8xx: Use L1 entry APG to handle _PAGE_ACCESSED for CONFIG_SWAP"
  powerpc/8xx: add missing header in 8xx_mmu.c
  powerpc/8xx: Add DT node for using the SEC engine of the MPC885
  ...

Various powerpc boards select the PCI_MSI config option without selecting
PCI, resulting in potentially not compilable configurations if the by
default enabled PCI option is disabled.  Explicitly select PCI to ensure
we always have valid configs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>