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-rw-r--r--drivers/pci/Kconfig62
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 438a792d2cf7..0c473d75e625 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -190,6 +190,68 @@ config PCI_HYPERV
The PCI device frontend driver allows the kernel to import arbitrary
PCI devices from a PCI backend to support PCI driver domains.
+choice
+ prompt "PCI Express hierarchy optimization setting"
+ default PCIE_BUS_DEFAULT
+ depends on PCI && EXPERT
+ help
+ MPS (Max Payload Size) and MRRS (Max Read Request Size) are PCIe
+ device parameters that affect performance and the ability to
+ support hotplug and peer-to-peer DMA.
+
+ The following choices set the MPS and MRRS optimization strategy
+ at compile-time. The choices are the same as those offered for
+ the kernel command-line parameter 'pci', i.e.,
+ 'pci=pcie_bus_tune_off', 'pci=pcie_bus_safe',
+ 'pci=pcie_bus_perf', and 'pci=pcie_bus_peer2peer'.
+
+ This is a compile-time setting and can be overridden by the above
+ command-line parameters. If unsure, choose PCIE_BUS_DEFAULT.
+
+config PCIE_BUS_TUNE_OFF
+ bool "Tune Off"
+ depends on PCI
+ help
+ Use the BIOS defaults; don't touch MPS at all. This is the same
+ as booting with 'pci=pcie_bus_tune_off'.
+
+config PCIE_BUS_DEFAULT
+ bool "Default"
+ depends on PCI
+ help
+ Default choice; ensure that the MPS matches upstream bridge.
+
+config PCIE_BUS_SAFE
+ bool "Safe"
+ depends on PCI
+ help
+ Use largest MPS that boot-time devices support. If you have a
+ closed system with no possibility of adding new devices, this
+ will use the largest MPS that's supported by all devices. This
+ is the same as booting with 'pci=pcie_bus_safe'.
+
+config PCIE_BUS_PERFORMANCE
+ bool "Performance"
+ depends on PCI
+ help
+ Use MPS and MRRS for best performance. Ensure that a given
+ device's MPS is no larger than its parent MPS, which allows us to
+ keep all switches/bridges to the max MPS supported by their
+ parent. This is the same as booting with 'pci=pcie_bus_perf'.
+
+config PCIE_BUS_PEER2PEER
+ bool "Peer2peer"
+ depends on PCI
+ help
+ Set MPS = 128 for all devices. MPS configuration effected by the
+ other options could cause the MPS on one root port to be
+ different than that of the MPS on another, which may cause
+ hot-added devices or peer-to-peer DMA to fail. Set MPS to the
+ smallest possible value (128B) system-wide to avoid these issues.
+ This is the same as booting with 'pci=pcie_bus_peer2peer'.
+
+endchoice
+
source "drivers/pci/hotplug/Kconfig"
source "drivers/pci/controller/Kconfig"
source "drivers/pci/endpoint/Kconfig"