296 lines
8.2 KiB
Plaintext
296 lines
8.2 KiB
Plaintext
# 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
|