tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 depends on MMU
25 help
26 This option enables support for the PCI local bus, including
27 support for PCI-X and the foundations for PCI Express support.
28 Say 'Y' here unless you know what you are doing.
29
30if PCI
31
32config PCI_DOMAINS
33 bool
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_IDE
125 bool
126
127config PCI_TSM
128 bool "PCI TSM: Device security protocol support"
129 select PCI_IDE
130 select PCI_DOE
131 select TSM
132 help
133 The TEE (Trusted Execution Environment) Device Interface
134 Security Protocol (TDISP) defines a "TSM" as a platform agent
135 that manages device authentication, link encryption, link
136 integrity protection, and assignment of PCI device functions
137 (virtual or physical) to confidential computing VMs that can
138 access (DMA) guest private memory.
139
140 Enable a platform TSM driver to use this capability.
141
142config PCI_DOE
143 bool "Enable PCI Data Object Exchange (DOE) support"
144 help
145 Say Y here if you want be able to communicate with PCIe DOE
146 mailboxes.
147
148config PCI_ECAM
149 bool
150
151config PCI_LOCKLESS_CONFIG
152 bool
153
154config PCI_BRIDGE_EMUL
155 bool
156
157config PCI_IOV
158 bool "PCI IOV support"
159 select PCI_ATS
160 help
161 I/O Virtualization is a PCI feature supported by some devices
162 which allows them to create virtual devices which share their
163 physical resources.
164
165 If unsure, say N.
166
167config PCI_NPEM
168 bool "Native PCIe Enclosure Management"
169 depends on LEDS_CLASS=y
170 help
171 Support for Native PCIe Enclosure Management. It allows managing LED
172 indications in storage enclosures. Enclosure must support following
173 indications: OK, Locate, Fail, Rebuild, other indications are
174 optional.
175
176config PCI_PRI
177 bool "PCI PRI support"
178 select PCI_ATS
179 help
180 PRI is the PCI Page Request Interface. It allows PCI devices that are
181 behind an IOMMU to recover from page faults.
182
183 If unsure, say N.
184
185config PCI_PASID
186 bool "PCI PASID support"
187 select PCI_ATS
188 help
189 Process Address Space Identifiers (PASIDs) can be used by PCI devices
190 to access more than one IO address space at the same time. To make
191 use of this feature an IOMMU is required which also supports PASIDs.
192 Select this option if you have such an IOMMU and want to compile the
193 driver for it into your kernel.
194
195 If unsure, say N.
196
197config PCIE_TPH
198 bool "TLP Processing Hints"
199 help
200 This option adds support for PCIe TLP Processing Hints (TPH).
201 TPH allows endpoint devices to provide optimization hints, such as
202 desired caching behavior, for requests that target memory space.
203 These hints, called Steering Tags, can empower the system hardware
204 to optimize the utilization of platform resources.
205
206config PCI_P2PDMA
207 bool "PCI peer-to-peer transfer support"
208 depends on ZONE_DEVICE
209 #
210 # The need for the scatterlist DMA bus address flag means PCI P2PDMA
211 # requires 64bit
212 #
213 depends on 64BIT
214 select GENERIC_ALLOCATOR
215 select NEED_SG_DMA_FLAGS
216 help
217 Enables drivers to do PCI peer-to-peer transactions to and from
218 BARs that are exposed in other devices that are the part of
219 the hierarchy where peer-to-peer DMA is guaranteed by the PCI
220 specification to work (ie. anything below a single PCI bridge).
221
222 Many PCIe root complexes do not support P2P transactions and
223 it's hard to tell which support it at all, so at this time,
224 P2P DMA transactions must be between devices behind the same root
225 port.
226
227 If unsure, say N.
228
229config PCI_LABEL
230 def_bool y if (DMI || ACPI)
231 select NLS
232
233config PCI_HYPERV
234 tristate "Hyper-V PCI Frontend"
235 depends on ((X86 && X86_64) || ARM64) && HYPERV_VMBUS && PCI_MSI && SYSFS
236 select PCI_HYPERV_INTERFACE
237 select IRQ_MSI_LIB
238 help
239 The PCI device frontend driver allows the kernel to import arbitrary
240 PCI devices from a PCI backend to support PCI driver domains.
241
242config PCI_DYNAMIC_OF_NODES
243 bool "Create Device tree nodes for PCI devices"
244 depends on OF_IRQ
245 select OF_DYNAMIC
246 help
247 This option enables support for generating device tree nodes for some
248 PCI devices. Thus, the driver of this kind can load and overlay
249 flattened device tree for its downstream devices.
250
251 Once this option is selected, the device tree nodes will be generated
252 for all PCI bridges.
253
254choice
255 prompt "PCI Express hierarchy optimization setting"
256 default PCIE_BUS_DEFAULT
257 depends on EXPERT
258 help
259 MPS (Max Payload Size) and MRRS (Max Read Request Size) are PCIe
260 device parameters that affect performance and the ability to
261 support hotplug and peer-to-peer DMA.
262
263 The following choices set the MPS and MRRS optimization strategy
264 at compile-time. The choices are the same as those offered for
265 the kernel command-line parameter 'pci', i.e.,
266 'pci=pcie_bus_tune_off', 'pci=pcie_bus_safe',
267 'pci=pcie_bus_perf', and 'pci=pcie_bus_peer2peer'.
268
269 This is a compile-time setting and can be overridden by the above
270 command-line parameters. If unsure, choose PCIE_BUS_DEFAULT.
271
272config PCIE_BUS_TUNE_OFF
273 bool "Tune Off"
274 help
275 Use the BIOS defaults; don't touch MPS at all. This is the same
276 as booting with 'pci=pcie_bus_tune_off'.
277
278config PCIE_BUS_DEFAULT
279 bool "Default"
280 help
281 Default choice; ensure that the MPS matches upstream bridge.
282
283config PCIE_BUS_SAFE
284 bool "Safe"
285 help
286 Use largest MPS that boot-time devices support. If you have a
287 closed system with no possibility of adding new devices, this
288 will use the largest MPS that's supported by all devices. This
289 is the same as booting with 'pci=pcie_bus_safe'.
290
291config PCIE_BUS_PERFORMANCE
292 bool "Performance"
293 help
294 Use MPS and MRRS for best performance. Ensure that a given
295 device's MPS is no larger than its parent MPS, which allows us to
296 keep all switches/bridges to the max MPS supported by their
297 parent. This is the same as booting with 'pci=pcie_bus_perf'.
298
299config PCIE_BUS_PEER2PEER
300 bool "Peer2peer"
301 help
302 Set MPS = 128 for all devices. MPS configuration effected by the
303 other options could cause the MPS on one root port to be
304 different than that of the MPS on another, which may cause
305 hot-added devices or peer-to-peer DMA to fail. Set MPS to the
306 smallest possible value (128B) system-wide to avoid these issues.
307 This is the same as booting with 'pci=pcie_bus_peer2peer'.
308
309endchoice
310
311config VGA_ARB
312 bool "VGA Arbitration" if EXPERT
313 default y
314 depends on !S390
315 select SCREEN_INFO if X86
316 help
317 Some "legacy" VGA devices implemented on PCI typically have the same
318 hard-decoded addresses as they did on ISA. When multiple PCI devices
319 are accessed at same time they need some kind of coordination. Please
320 see Documentation/gpu/vgaarbiter.rst for more details. Select this to
321 enable VGA arbiter.
322
323config VGA_ARB_MAX_GPUS
324 int "Maximum number of GPUs"
325 default 16
326 depends on VGA_ARB
327 help
328 Reserves space in the kernel to maintain resource locking for
329 multiple GPUS. The overhead for each GPU is very small.
330
331source "drivers/pci/hotplug/Kconfig"
332source "drivers/pci/controller/Kconfig"
333source "drivers/pci/endpoint/Kconfig"
334source "drivers/pci/switch/Kconfig"
335source "drivers/pci/pwrctrl/Kconfig"
336
337endif # PCI