Hello,
This set of commits fixes a number of problems in the PCIe support of
the Armada 370 and Armada XP SoCs, allowing to use PCIe devices that
were not properly supported until now.
Due to the interaction of PCIe with other subsystems, the fixes are
not limited to drivers/pci, but also touch drivers/bus and
drivers/irqchip.
Here are the details of the patches:
* The first three patches are fixes in the MSI handling. They fix
problems with PCIe device drivers trying to use MSI-X (which we
don't support), and incorrect freeing of MSIs causing kernel panics
when PCIe device drivers try to allocate/free MSIs several times.
They touch drivers/irqchip/ only, and they are independent from the
rest of the series, both from a build and a runtime point of view.
These bugs exist since the MSI support was added, in v3.13. The
commits carry the necessary Fixes and Cc to stable informations.
* The fourth patch fixes an off-by-one in the computed size of MBus
windows. This only worked because the mvebu-mbus driver was
silently accepting invalid sizes. I've marked it for stable because
it really is bug, but even though it's not visible by itself, it is
needed for other patches in the series.
This patch touches drivers/pci/host, and should probably be taken
by the mvebu maintainers, with the Ack of the PCI maintainer, as it
is a runtime dependency for the next patch.
This patch is marked for stable all the way to when the PCI driver
was introduced.
* The fifth patch make the mvebu-mbus driver check (and loudly
complain) if it is asked to create invalid regions (whose base
address or size are not compatible with the documented MBus
requirements).
This patch touches drivers/bus, and should probably be taken by the
mvebu maintainers. As explained above, it is mandatory to have
PATCH 4 applied before PATCH 5: there is a runtime dependency
between the two (but no build time dependency).
This patch is not marked for stable, as it only adds some
additional debugging information, which while very useful, is not
technically stable material.
* The sixth patch relaxes a check in mvebu-mbus driver about
conflicting windows, which is necessary
This patch touches drivers/bus, and should probably be taken by the
mvebu maintainers. It is not a fix by itself, but it is required
for the last patch, which is a fix. Therefore, it is marked for
stable, all the way to when the mvebu-mbus driver was introduced.
* The seventh patch improves the pci-mvebu driver to allow the
creation of multiple MBus windows when the PCI BAR calculated by
the Linux PCI core has a non power-of-two size. This is needed
because MBus windows can only have power-of-two sizes. Until now,
we were configuring invalid MBus windows, which with certain PCIe
devices, was either causing kernel panics at boot time or
misfunction of the device.
These patches have been tested by Neil Greatorex
<neil@xxxxxxxxxxxxxxx> who initially reported the issues, have also
been tested by Willy Tarreau and Matthew Winter (even though they
didn't give their formal Tested-by [1] [2]), and have been heavily
discussed with Jason Gunthorpe.
Note that there are still two known issues in the mvebu PCIe handling:
1/ When earlyprintk is disabled, we have a timing / PHY reset issue
which leads to the PCIe device connected on the first interface to
not be detected. We already have patches floating around, but
nothing that we are all happy with yet.
2/ When a PCI IGB card is plugged with many other PCI devices in a
system, the IGB card initialization doesn't work ('igb
0000:01:00.0: The NVM Checksum Is Not Valid'). We are still
working on this issue.
These two issues will be handled separately.
Thanks,
Thomas
[1] http://www.spinics.net/lists/linux-pci/msg30406.html
[2] http://www.spinics.net/lists/linux-pci/msg30444.html
Jason Gunthorpe (1):
bus: mvebu-mbus: Avoid setting an undefined window size
Neil Greatorex (1):
irqchip: armada-370-xp: Fix releasing of MSIs
Thomas Petazzoni (4):
irqchip: armada-370-xp: fix invalid cast of signed value into unsigned
variable
irqchip: armada-370-xp: implement the ->check_device() msi_chip
operation
bus: mvebu-mbus: allow several windows with the same target/attribute
pci: pci-mvebu: split PCIe BARs into multiple MBus windows when needed
Willy Tarreau (1):
pci: mvebu: fix off-by-one in the computed size of the mbus windows
drivers/bus/mvebu-mbus.c | 22 ++++++---
drivers/irqchip/irq-armada-370-xp.c | 17 +++++--
drivers/pci/host/pci-mvebu.c | 92 ++++++++++++++++++++++++++++++-------
3 files changed, 106 insertions(+), 25 deletions(-)
--
1.9.2
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