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@system 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@xxxxxxxxxxxxxxxxxx>
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
