The Kconfig is modified so that the pcie_bus_config setting can be done at build time in the same manner as the CONFIG_PCIEASPM_XXXX choice. The pci_bus_config setting may still be overridden by the bootline param. Signed-off-by: Jim Quinlan <james.quinlan@xxxxxxxxxxxx> --- drivers/pci/Kconfig | 56 +++++++++++++++++++++++++++++++++++++++++++++ drivers/pci/pci.c | 12 ++++++++++ 2 files changed, 68 insertions(+) diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 4bef5c2bae9f..15ce948858fb 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -187,6 +187,62 @@ 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 "PCIE default bus config setting" + default PCIE_BUS_DEFAULT + depends on PCI + help + One of the following choices will set the pci_bus_config at + compile time. The choices offered are the same as those offered + for the bootline 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 is still be overridden by the + above bootline parameters, if present. If unsure, chose PCIE_BUS_DEFAULT. + +config PCIE_BUS_TUNE_OFF + bool "Tune Off" + depends on PCI + help + Use the BIOS defaults; doesn'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; ensures 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. This setting ensures + 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 and eventually the PHB. 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. Simply making the system + wide MPS be set to the smallest possible value (128B) solves + this issue. 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" diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e39c5499770f..dfb52ed4a931 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -101,7 +101,19 @@ unsigned long pci_hotplug_mmio_pref_size = DEFAULT_HOTPLUG_MMIO_PREF_SIZE; #define DEFAULT_HOTPLUG_BUS_SIZE 1 unsigned long pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE; + +/* PCIE bus config, can be overridden by bootline param */ +#ifdef CONFIG_PCIE_BUS_TUNE_OFF +enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_TUNE_OFF; +#elif defined CONFIG_PCIE_BUS_SAFE +enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_SAFE; +#elif defined CONFIG_PCIE_BUS_PERFORMANCE +enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_PERFORMANCE; +#elif defined CONFIG_PCIE_BUS_PEER2PEER +enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_PEER2PEER; +#else enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_DEFAULT; +#endif /* * The default CLS is used if arch didn't set CLS explicitly and not -- 2.17.1
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