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