linux-kernel - [PATCH 0/2] Silent PCI realignment messages during boot

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Message-Id: <20180314163455.15854-1-desnesn@linux.vnet.ibm.com>
Date:   Wed, 14 Mar 2018 13:34:53 -0300
From:   "Desnes A. Nunes do Rosario" <desnesn@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     bhelgaas@...gle.com, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au, ruscur@...sell.cc, aik@...abs.ru,
        david@...son.dropbear.id.au, fbarrat@...ux.vnet.ibm.com,
        brking@...ux.vnet.ibm.com
Subject: [PATCH 0/2] Silent PCI realignment messages during boot

This patchset introduces PCI_DEV_FLAGS_QUIET_PCI_REALIGN attribute in
pci_dev_flags which informs the pci subsystem to suppress all realignment
messages.

Powerpc has aligned all of its PCI resources to its PAGE_SIZE, and this
feature can be easily used on any other arch through the __weak
pcibios_default_alignment() interface.

However, since all PCI resources will be now realigned during boot, the
following messages will not only flood the system logs, but can be inter-
preted as a false positive for total PCI failure on the system.

[root@...tem user]# dmesg | grep -i disabling
[    0.692270] pci 0000:00:00.0: Disabling memory decoding and releasing memory resources
[    0.692324] pci 0000:00:00.0: disabling bridge mem windows
[    0.729134] pci 0001:00:00.0: Disabling memory decoding and releasing memory resources
[    0.737352] pci 0001:00:00.0: disabling bridge mem windows
[    0.776295] pci 0002:00:00.0: Disabling memory decoding and releasing memory resources
[    0.784509] pci 0002:00:00.0: disabling bridge mem windows
... and goes on for all PCI devices ...

Thus, this patchset provides a way for drivers to silent these messages if
the PCI_DEV_FLAGS_QUIET_PCI_REALIGN is turned on. Moreover, it also
tweaks this flag during boot on powerpc.

Fixes: 38274637699 ("powerpc/powernv: Override pcibios_default_alignment() to force PCI devices to be page aligned")
Signed-off-by: Desnes A. Nunes do Rosario <desnesn@...ux.vnet.ibm.com>

Desnes A. Nunes do Rosario (2):
  pci: Addition of PCI_DEV_FLAGS_QUIET_PCI_REALIGN attribute to the PCI
    subsystem
  powerpc/powernv: Tweak PCI_DEV_FLAGS_QUIET_PCI_REALIGN on/off during
    boot

 arch/powerpc/platforms/powernv/pci.c | 14 ++++++++++++++
 drivers/pci/pci.c                    |  3 ++-
 drivers/pci/setup-res.c              |  3 ++-
 include/linux/pci.h                  |  2 ++
 4 files changed, 20 insertions(+), 2 deletions(-)

-- 
2.14.3