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| author | Keith Busch <keith.busch@intel.com> | 2015-08-24 16:48:16 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-08-24 16:48:16 +0300 |
| commit | 27d868b5e6cfaee4fec66b388e4085ff94050fa7 (patch) | |
| tree | 9df429169a5671c49c70b0ac34c8ba95fb1e21b7 /drivers/pci/quirks.c | |
| parent | 9dae3a97297f71e884ed8e7664955bcacb86f010 (diff) | |
| download | linux-27d868b5e6cfaee4fec66b388e4085ff94050fa7.tar.xz | |
PCI: Set MPS to match upstream bridge
Firmware typically configures the PCIe fabric with a consistent Max Payload
Size setting based on the devices present at boot. A hot-added device
typically has the power-on default MPS setting (128 bytes), which may not
match the fabric.
The previous Linux default, in the absence of any "pci=pcie_bus_*" options,
was PCIE_BUS_TUNE_OFF, in which we never touch MPS, even for hot-added
devices.
Add a new default setting, PCIE_BUS_DEFAULT, in which we make sure every
device's MPS setting matches the upstream bridge. This makes it more
likely that a hot-added device will work in a system with optimized MPS
configuration.
Note that if we hot-add a device that only supports 128-byte MPS, it still
likely won't work because we don't reconfigure the rest of the fabric.
Booting with "pci=pcie_bus_peer2peer" is a workaround for this because it
sets MPS to 128 for everything.
[bhelgaas: changelog, new default, rework for pci_configure_device() path]
Tested-by: Keith Busch <keith.busch@intel.com>
Tested-by: Jordan Hargrave <jharg93@gmail.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Diffstat (limited to 'drivers/pci/quirks.c')
| -rw-r--r-- | drivers/pci/quirks.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index e9fd0e90fa3b..55f2c208bd0e 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2862,7 +2862,8 @@ static void quirk_intel_mc_errata(struct pci_dev *dev) int err; u16 rcc; - if (pcie_bus_config == PCIE_BUS_TUNE_OFF) + if (pcie_bus_config == PCIE_BUS_TUNE_OFF || + pcie_bus_config == PCIE_BUS_DEFAULT) return; /* Intel errata specifies bits to change but does not say what they are. |