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1#
2# PCI configuration
3#
4config ARCH_SUPPORTS_MSI
5 bool
6 default n
7
8config PCI_MSI
9 bool "Message Signaled Interrupts (MSI and MSI-X)"
10 depends on PCI
11 depends on ARCH_SUPPORTS_MSI
12 help
13 This allows device drivers to enable MSI (Message Signaled
14 Interrupts). Message Signaled Interrupts enable a device to
15 generate an interrupt using an inbound Memory Write on its
16 PCI bus instead of asserting a device IRQ pin.
17
18 Use of PCI MSI interrupts can be disabled at kernel boot time
19 by using the 'pci=nomsi' option. This disables MSI for the
20 entire system.
21
22 If you don't know what to do here, say Y.
23
24config PCI_DEBUG
25 bool "PCI Debugging"
26 depends on PCI && DEBUG_KERNEL
27 help
28 Say Y here if you want the PCI core to produce a bunch of debug
29 messages to the system log. Select this if you are having a
30 problem with PCI support and want to see more of what is going on.
31
32 When in doubt, say N.
33
34config PCI_STUB
35 tristate "PCI Stub driver"
36 depends on PCI
37 help
38 Say Y or M here if you want be able to reserve a PCI device
39 when it is going to be assigned to a guest operating system.
40
41 When in doubt, say N.
42
43config XEN_PCIDEV_FRONTEND
44 tristate "Xen PCI Frontend"
45 depends on PCI && X86 && XEN
46 select HOTPLUG
47 select PCI_XEN
48 select XEN_XENBUS_FRONTEND
49 default y
50 help
51 The PCI device frontend driver allows the kernel to import arbitrary
52 PCI devices from a PCI backend to support PCI driver domains.
53
54config XEN_PCIDEV_FE_DEBUG
55 bool "Xen PCI Frontend debugging"
56 depends on XEN_PCIDEV_FRONTEND && PCI_DEBUG
57 help
58 Say Y here if you want the Xen PCI frontend to produce a bunch of debug
59 messages to the system log. Select this if you are having a
60 problem with Xen PCI frontend support and want to see more of what is
61 going on.
62
63 When in doubt, say N.
64
65config HT_IRQ
66 bool "Interrupts on hypertransport devices"
67 default y
68 depends on PCI && X86_LOCAL_APIC && X86_IO_APIC
69 help
70 This allows native hypertransport devices to use interrupts.
71
72 If unsure say Y.
73
74config PCI_IOV
75 bool "PCI IOV support"
76 depends on PCI
77 help
78 I/O Virtualization is a PCI feature supported by some devices
79 which allows them to create virtual devices which share their
80 physical resources.
81
82 If unsure, say N.
83
84config PCI_IOAPIC
85 bool
86 depends on PCI
87 depends on ACPI
88 depends on HOTPLUG
89 default y
90
91config PCI_LABEL
92 def_bool y if (DMI || ACPI)
93 select NLS
1# SPDX-License-Identifier: GPL-2.0
2#
3# PCI configuration
4#
5
6# select this to offer the PCI prompt
7config HAVE_PCI
8 bool
9
10# select this to unconditionally force on PCI support
11config FORCE_PCI
12 bool
13 select HAVE_PCI
14 select PCI
15
16# select this to provide a generic PCI iomap,
17# without PCI itself having to be defined
18config GENERIC_PCI_IOMAP
19 bool
20
21menuconfig PCI
22 bool "PCI support"
23 depends on HAVE_PCI
24 help
25 This option enables support for the PCI local bus, including
26 support for PCI-X and the foundations for PCI Express support.
27 Say 'Y' here unless you know what you are doing.
28
29if PCI
30
31config PCI_DOMAINS
32 bool
33 depends on PCI
34
35config PCI_DOMAINS_GENERIC
36 bool
37 select PCI_DOMAINS
38
39config PCI_SYSCALL
40 bool
41
42source "drivers/pci/pcie/Kconfig"
43
44config PCI_MSI
45 bool "Message Signaled Interrupts (MSI and MSI-X)"
46 select GENERIC_MSI_IRQ
47 help
48 This allows device drivers to enable MSI (Message Signaled
49 Interrupts). Message Signaled Interrupts enable a device to
50 generate an interrupt using an inbound Memory Write on its
51 PCI bus instead of asserting a device IRQ pin.
52
53 Use of PCI MSI interrupts can be disabled at kernel boot time
54 by using the 'pci=nomsi' option. This disables MSI for the
55 entire system.
56
57 If you don't know what to do here, say Y.
58
59config PCI_MSI_ARCH_FALLBACKS
60 bool
61
62config PCI_QUIRKS
63 default y
64 bool "Enable PCI quirk workarounds" if EXPERT
65 help
66 This enables workarounds for various PCI chipset bugs/quirks.
67 Disable this only if your target machine is unaffected by PCI
68 quirks.
69
70config PCI_DEBUG
71 bool "PCI Debugging"
72 depends on DEBUG_KERNEL
73 help
74 Say Y here if you want the PCI core to produce a bunch of debug
75 messages to the system log. Select this if you are having a
76 problem with PCI support and want to see more of what is going on.
77
78 When in doubt, say N.
79
80config PCI_REALLOC_ENABLE_AUTO
81 bool "Enable PCI resource re-allocation detection"
82 depends on PCI_IOV
83 help
84 Say Y here if you want the PCI core to detect if PCI resource
85 re-allocation needs to be enabled. You can always use pci=realloc=on
86 or pci=realloc=off to override it. It will automatically
87 re-allocate PCI resources if SR-IOV BARs have not been allocated by
88 the BIOS.
89
90 When in doubt, say N.
91
92config PCI_STUB
93 tristate "PCI Stub driver"
94 help
95 Say Y or M here if you want be able to reserve a PCI device
96 when it is going to be assigned to a guest operating system.
97
98 When in doubt, say N.
99
100config PCI_PF_STUB
101 tristate "PCI PF Stub driver"
102 depends on PCI_IOV
103 help
104 Say Y or M here if you want to enable support for devices that
105 require SR-IOV support, while at the same time the PF (Physical
106 Function) itself is not providing any actual services on the
107 host itself such as storage or networking.
108
109 When in doubt, say N.
110
111config XEN_PCIDEV_FRONTEND
112 tristate "Xen PCI Frontend"
113 depends on XEN_PV
114 select PCI_XEN
115 select XEN_XENBUS_FRONTEND
116 default y
117 help
118 The PCI device frontend driver allows the kernel to import arbitrary
119 PCI devices from a PCI backend to support PCI driver domains.
120
121config PCI_ATS
122 bool
123
124config PCI_DOE
125 bool
126
127config PCI_ECAM
128 bool
129
130config PCI_LOCKLESS_CONFIG
131 bool
132
133config PCI_BRIDGE_EMUL
134 bool
135
136config PCI_IOV
137 bool "PCI IOV support"
138 select PCI_ATS
139 help
140 I/O Virtualization is a PCI feature supported by some devices
141 which allows them to create virtual devices which share their
142 physical resources.
143
144 If unsure, say N.
145
146config PCI_PRI
147 bool "PCI PRI support"
148 select PCI_ATS
149 help
150 PRI is the PCI Page Request Interface. It allows PCI devices that are
151 behind an IOMMU to recover from page faults.
152
153 If unsure, say N.
154
155config PCI_PASID
156 bool "PCI PASID support"
157 select PCI_ATS
158 help
159 Process Address Space Identifiers (PASIDs) can be used by PCI devices
160 to access more than one IO address space at the same time. To make
161 use of this feature an IOMMU is required which also supports PASIDs.
162 Select this option if you have such an IOMMU and want to compile the
163 driver for it into your kernel.
164
165 If unsure, say N.
166
167config PCI_P2PDMA
168 bool "PCI peer-to-peer transfer support"
169 depends on ZONE_DEVICE
170 #
171 # The need for the scatterlist DMA bus address flag means PCI P2PDMA
172 # requires 64bit
173 #
174 depends on 64BIT
175 select GENERIC_ALLOCATOR
176 select NEED_SG_DMA_FLAGS
177 help
178 Enables drivers to do PCI peer-to-peer transactions to and from
179 BARs that are exposed in other devices that are the part of
180 the hierarchy where peer-to-peer DMA is guaranteed by the PCI
181 specification to work (ie. anything below a single PCI bridge).
182
183 Many PCIe root complexes do not support P2P transactions and
184 it's hard to tell which support it at all, so at this time,
185 P2P DMA transactions must be between devices behind the same root
186 port.
187
188 If unsure, say N.
189
190config PCI_LABEL
191 def_bool y if (DMI || ACPI)
192 select NLS
193
194config PCI_HYPERV
195 tristate "Hyper-V PCI Frontend"
196 depends on ((X86 && X86_64) || ARM64) && HYPERV && PCI_MSI && SYSFS
197 select PCI_HYPERV_INTERFACE
198 help
199 The PCI device frontend driver allows the kernel to import arbitrary
200 PCI devices from a PCI backend to support PCI driver domains.
201
202config PCI_DYNAMIC_OF_NODES
203 bool "Create Device tree nodes for PCI devices"
204 depends on OF_IRQ
205 select OF_DYNAMIC
206 help
207 This option enables support for generating device tree nodes for some
208 PCI devices. Thus, the driver of this kind can load and overlay
209 flattened device tree for its downstream devices.
210
211 Once this option is selected, the device tree nodes will be generated
212 for all PCI bridges.
213
214choice
215 prompt "PCI Express hierarchy optimization setting"
216 default PCIE_BUS_DEFAULT
217 depends on PCI && EXPERT
218 help
219 MPS (Max Payload Size) and MRRS (Max Read Request Size) are PCIe
220 device parameters that affect performance and the ability to
221 support hotplug and peer-to-peer DMA.
222
223 The following choices set the MPS and MRRS optimization strategy
224 at compile-time. The choices are the same as those offered for
225 the kernel command-line parameter 'pci', i.e.,
226 'pci=pcie_bus_tune_off', 'pci=pcie_bus_safe',
227 'pci=pcie_bus_perf', and 'pci=pcie_bus_peer2peer'.
228
229 This is a compile-time setting and can be overridden by the above
230 command-line parameters. If unsure, choose PCIE_BUS_DEFAULT.
231
232config PCIE_BUS_TUNE_OFF
233 bool "Tune Off"
234 depends on PCI
235 help
236 Use the BIOS defaults; don't touch MPS at all. This is the same
237 as booting with 'pci=pcie_bus_tune_off'.
238
239config PCIE_BUS_DEFAULT
240 bool "Default"
241 depends on PCI
242 help
243 Default choice; ensure that the MPS matches upstream bridge.
244
245config PCIE_BUS_SAFE
246 bool "Safe"
247 depends on PCI
248 help
249 Use largest MPS that boot-time devices support. If you have a
250 closed system with no possibility of adding new devices, this
251 will use the largest MPS that's supported by all devices. This
252 is the same as booting with 'pci=pcie_bus_safe'.
253
254config PCIE_BUS_PERFORMANCE
255 bool "Performance"
256 depends on PCI
257 help
258 Use MPS and MRRS for best performance. Ensure that a given
259 device's MPS is no larger than its parent MPS, which allows us to
260 keep all switches/bridges to the max MPS supported by their
261 parent. This is the same as booting with 'pci=pcie_bus_perf'.
262
263config PCIE_BUS_PEER2PEER
264 bool "Peer2peer"
265 depends on PCI
266 help
267 Set MPS = 128 for all devices. MPS configuration effected by the
268 other options could cause the MPS on one root port to be
269 different than that of the MPS on another, which may cause
270 hot-added devices or peer-to-peer DMA to fail. Set MPS to the
271 smallest possible value (128B) system-wide to avoid these issues.
272 This is the same as booting with 'pci=pcie_bus_peer2peer'.
273
274endchoice
275
276config VGA_ARB
277 bool "VGA Arbitration" if EXPERT
278 default y
279 depends on (PCI && !S390)
280 help
281 Some "legacy" VGA devices implemented on PCI typically have the same
282 hard-decoded addresses as they did on ISA. When multiple PCI devices
283 are accessed at same time they need some kind of coordination. Please
284 see Documentation/gpu/vgaarbiter.rst for more details. Select this to
285 enable VGA arbiter.
286
287config VGA_ARB_MAX_GPUS
288 int "Maximum number of GPUs"
289 default 16
290 depends on VGA_ARB
291 help
292 Reserves space in the kernel to maintain resource locking for
293 multiple GPUS. The overhead for each GPU is very small.
294
295source "drivers/pci/hotplug/Kconfig"
296source "drivers/pci/controller/Kconfig"
297source "drivers/pci/endpoint/Kconfig"
298source "drivers/pci/switch/Kconfig"
299
300endif