| # 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 |
| |
| # select this to provide a generic PCI iomap, |
| # without PCI itself having to be defined |
| config GENERIC_PCI_IOMAP |
| bool |
| |
| menuconfig PCI |
| bool "PCI support" |
| depends on HAVE_PCI |
| depends on MMU |
| 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 "Enable PCI Data Object Exchange (DOE) support" |
| help |
| Say Y here if you want be able to communicate with PCIe DOE |
| mailboxes. |
| |
| 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_NPEM |
| bool "Native PCIe Enclosure Management" |
| depends on LEDS_CLASS=y |
| help |
| Support for Native PCIe Enclosure Management. It allows managing LED |
| indications in storage enclosures. Enclosure must support following |
| indications: OK, Locate, Fail, Rebuild, other indications are |
| optional. |
| |
| 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 PCIE_TPH |
| bool "TLP Processing Hints" |
| help |
| This option adds support for PCIe TLP Processing Hints (TPH). |
| TPH allows endpoint devices to provide optimization hints, such as |
| desired caching behavior, for requests that target memory space. |
| These hints, called Steering Tags, can empower the system hardware |
| to optimize the utilization of platform resources. |
| |
| 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 |
| Enables 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. |
| |
| Enabling this option will reduce the entropy of x86 KASLR memory |
| regions. For example - on a 46 bit system, the entropy goes down |
| from 16 bits to 15 bits. The actual reduction in entropy depends |
| on the physical address bits, on processor features, kernel config |
| (5 level page table) and physical memory present on the system. |
| |
| 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_VMBUS && PCI_MSI && SYSFS |
| select PCI_HYPERV_INTERFACE |
| select IRQ_MSI_LIB |
| 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) |
| select SCREEN_INFO if X86 |
| 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" |
| source "drivers/pci/pwrctrl/Kconfig" |
| |
| endif |
