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Diffstat (limited to 'drivers/pci/Kconfig')
| -rw-r--r-- | drivers/pci/Kconfig | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig new file mode 100644 index 0000000000..e9ae66cc41 --- /dev/null +++ b/drivers/pci/Kconfig @@ -0,0 +1,295 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# PCI configuration +# + +# select this to offer the PCI prompt +config HAVE_PCI + bool + +# select this to unconditionally force on PCI support +config FORCE_PCI + bool + select HAVE_PCI + select PCI + +menuconfig PCI + bool "PCI support" + depends on HAVE_PCI + help + This option enables support for the PCI local bus, including + support for PCI-X and the foundations for PCI Express support. + Say 'Y' here unless you know what you are doing. + +if PCI + +config PCI_DOMAINS + bool + depends on PCI + +config PCI_DOMAINS_GENERIC + bool + select PCI_DOMAINS + +config PCI_SYSCALL + bool + +source "drivers/pci/pcie/Kconfig" + +config PCI_MSI + bool "Message Signaled Interrupts (MSI and MSI-X)" + select GENERIC_MSI_IRQ + help + This allows device drivers to enable MSI (Message Signaled + Interrupts). Message Signaled Interrupts enable a device to + generate an interrupt using an inbound Memory Write on its + PCI bus instead of asserting a device IRQ pin. + + Use of PCI MSI interrupts can be disabled at kernel boot time + by using the 'pci=nomsi' option. This disables MSI for the + entire system. + + If you don't know what to do here, say Y. + +config PCI_MSI_ARCH_FALLBACKS + bool + +config PCI_QUIRKS + default y + bool "Enable PCI quirk workarounds" if EXPERT + help + This enables workarounds for various PCI chipset bugs/quirks. + Disable this only if your target machine is unaffected by PCI + quirks. + +config PCI_DEBUG + bool "PCI Debugging" + depends on DEBUG_KERNEL + help + Say Y here if you want the PCI core to produce a bunch of debug + messages to the system log. Select this if you are having a + problem with PCI support and want to see more of what is going on. + + When in doubt, say N. + +config PCI_REALLOC_ENABLE_AUTO + bool "Enable PCI resource re-allocation detection" + depends on PCI_IOV + help + Say Y here if you want the PCI core to detect if PCI resource + re-allocation needs to be enabled. You can always use pci=realloc=on + or pci=realloc=off to override it. It will automatically + re-allocate PCI resources if SR-IOV BARs have not been allocated by + the BIOS. + + When in doubt, say N. + +config PCI_STUB + tristate "PCI Stub driver" + help + Say Y or M here if you want be able to reserve a PCI device + when it is going to be assigned to a guest operating system. + + When in doubt, say N. + +config PCI_PF_STUB + tristate "PCI PF Stub driver" + depends on PCI_IOV + help + Say Y or M here if you want to enable support for devices that + require SR-IOV support, while at the same time the PF (Physical + Function) itself is not providing any actual services on the + host itself such as storage or networking. + + When in doubt, say N. + +config XEN_PCIDEV_FRONTEND + tristate "Xen PCI Frontend" + depends on XEN_PV + select PCI_XEN + select XEN_XENBUS_FRONTEND + default y + help + The PCI device frontend driver allows the kernel to import arbitrary + PCI devices from a PCI backend to support PCI driver domains. + +config PCI_ATS + bool + +config PCI_DOE + bool + +config PCI_ECAM + bool + +config PCI_LOCKLESS_CONFIG + bool + +config PCI_BRIDGE_EMUL + bool + +config PCI_IOV + bool "PCI IOV support" + select PCI_ATS + help + I/O Virtualization is a PCI feature supported by some devices + which allows them to create virtual devices which share their + physical resources. + + If unsure, say N. + +config PCI_PRI + bool "PCI PRI support" + select PCI_ATS + help + PRI is the PCI Page Request Interface. It allows PCI devices that are + behind an IOMMU to recover from page faults. + + If unsure, say N. + +config PCI_PASID + bool "PCI PASID support" + select PCI_ATS + help + Process Address Space Identifiers (PASIDs) can be used by PCI devices + to access more than one IO address space at the same time. To make + use of this feature an IOMMU is required which also supports PASIDs. + Select this option if you have such an IOMMU and want to compile the + driver for it into your kernel. + + If unsure, say N. + +config PCI_P2PDMA + bool "PCI peer-to-peer transfer support" + depends on ZONE_DEVICE + # + # The need for the scatterlist DMA bus address flag means PCI P2PDMA + # requires 64bit + # + depends on 64BIT + select GENERIC_ALLOCATOR + select NEED_SG_DMA_FLAGS + help + Enableѕ drivers to do PCI peer-to-peer transactions to and from + BARs that are exposed in other devices that are the part of + the hierarchy where peer-to-peer DMA is guaranteed by the PCI + specification to work (ie. anything below a single PCI bridge). + + Many PCIe root complexes do not support P2P transactions and + it's hard to tell which support it at all, so at this time, + P2P DMA transactions must be between devices behind the same root + port. + + If unsure, say N. + +config PCI_LABEL + def_bool y if (DMI || ACPI) + select NLS + +config PCI_HYPERV + tristate "Hyper-V PCI Frontend" + depends on ((X86 && X86_64) || ARM64) && HYPERV && PCI_MSI && SYSFS + select PCI_HYPERV_INTERFACE + help + The PCI device frontend driver allows the kernel to import arbitrary + PCI devices from a PCI backend to support PCI driver domains. + +config PCI_DYNAMIC_OF_NODES + bool "Create Device tree nodes for PCI devices" + depends on OF_IRQ + select OF_DYNAMIC + help + This option enables support for generating device tree nodes for some + PCI devices. Thus, the driver of this kind can load and overlay + flattened device tree for its downstream devices. + + Once this option is selected, the device tree nodes will be generated + for all PCI bridges. + +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 + +config VGA_ARB + bool "VGA Arbitration" if EXPERT + default y + depends on (PCI && !S390) + help + Some "legacy" VGA devices implemented on PCI typically have the same + hard-decoded addresses as they did on ISA. When multiple PCI devices + are accessed at same time they need some kind of coordination. Please + see Documentation/gpu/vgaarbiter.rst for more details. Select this to + enable VGA arbiter. + +config VGA_ARB_MAX_GPUS + int "Maximum number of GPUs" + default 16 + depends on VGA_ARB + help + Reserves space in the kernel to maintain resource locking for + multiple GPUS. The overhead for each GPU is very small. + +source "drivers/pci/hotplug/Kconfig" +source "drivers/pci/controller/Kconfig" +source "drivers/pci/endpoint/Kconfig" +source "drivers/pci/switch/Kconfig" + +endif |