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alistair23-linux/drivers/vfio/pci
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Alexey Kardashevskiy f97b54c815 vfio/pci/nvlink2: Do not attempt NPU2 setup on POWER8NVL NPU 
commit d22f9a6c92 upstream.

We execute certain NPU2 setup code (such as mapping an LPID to a device
in NPU2) unconditionally if an Nvlink bridge is detected. However this
cannot succeed on POWER8NVL machines as the init helpers return an error
other than ENODEV which means the device is there is and setup failed so
vfio_pci_enable() fails and pass through is not possible.

This changes the two NPU2 related init helpers to return -ENODEV if
there is no "memory-region" device tree property as this is
the distinction between NPU and NPU2.

Tested on
- POWER9 pvr=004e1201, Ubuntu 19.04 host, Ubuntu 18.04 vm,
  NVIDIA GV100 10de:1db1 driver 418.39
- POWER8 pvr=004c0100, RHEL 7.6 host, Ubuntu 16.10 vm,
  NVIDIA P100 10de:15f9 driver 396.47

Fixes: 7f92891778 ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver")
Cc: stable@vger.kernel.org # 5.0
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-12-30 11:51:30 +01:00
..
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
trace.h vfio/pci: Cleanup license mess 2019-01-22 11:06:05 -07:00
vfio_pci.c vfio-pci: Use io_remap_pfn_range() for PCI IO memory 2020-12-30 11:51:16 +01:00
vfio_pci_config.c vfio/pci: Decouple PCI_COMMAND_MEMORY bit checks from is_virtfn 2020-10-29 09:57:54 +01:00
vfio_pci_igd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
vfio_pci_intrs.c vfio/pci: Clear token on bypass registration failure 2020-10-29 09:57:56 +01:00
vfio_pci_nvlink2.c vfio/pci/nvlink2: Do not attempt NPU2 setup on POWER8NVL NPU 2020-12-30 11:51:30 +01:00
vfio_pci_private.h vfio-pci: Invalidate mmaps and block MMIO access on disabled memory 2020-09-09 19:12:30 +02:00
vfio_pci_rdwr.c vfio-pci: Invalidate mmaps and block MMIO access on disabled memory 2020-09-09 19:12:30 +02:00