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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/pci/Kconfig
....@@ -3,11 +3,41 @@
33 # PCI configuration
44 #
55 
6
+# select this to offer the PCI prompt
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+config HAVE_PCI
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+	bool
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+
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+# select this to unconditionally force on PCI support
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+config FORCE_PCI
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+	bool
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+	select HAVE_PCI
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+	select PCI
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+
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+menuconfig PCI
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+	bool "PCI support"
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+	depends on HAVE_PCI
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+	help
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+	  This option enables support for the PCI local bus, including
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+	  support for PCI-X and the foundations for PCI Express support.
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+	  Say 'Y' here unless you know what you are doing.
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+
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+if PCI
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+
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+config PCI_DOMAINS
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+	bool
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+	depends on PCI
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+
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+config PCI_DOMAINS_GENERIC
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+	bool
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+	select PCI_DOMAINS
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+
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+config PCI_SYSCALL
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+	bool
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+
637 source "drivers/pci/pcie/Kconfig"
738 
839 config PCI_MSI
940 	bool "Message Signaled Interrupts (MSI and MSI-X)"
10
-	depends on PCI
1141 	select GENERIC_MSI_IRQ
1242 	help
1343 	   This allows device drivers to enable MSI (Message Signaled
....@@ -22,14 +52,16 @@
2252 	   If you don't know what to do here, say Y.
2353 
2454 config PCI_MSI_IRQ_DOMAIN
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-	def_bool ARC || ARM || ARM64 || X86
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+	def_bool y
2656 	depends on PCI_MSI
2757 	select GENERIC_MSI_IRQ_DOMAIN
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+
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+config PCI_MSI_ARCH_FALLBACKS
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+	bool
2861 
2962 config PCI_QUIRKS
3063 	default y
3164 	bool "Enable PCI quirk workarounds" if EXPERT
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-	depends on PCI
3365 	help
3466 	  This enables workarounds for various PCI chipset bugs/quirks.
3567 	  Disable this only if your target machine is unaffected by PCI
....@@ -37,7 +69,7 @@
3769 
3870 config PCI_DEBUG
3971 	bool "PCI Debugging"
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-	depends on PCI && DEBUG_KERNEL
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+	depends on DEBUG_KERNEL
4173 	help
4274 	  Say Y here if you want the PCI core to produce a bunch of debug
4375 	  messages to the system log.  Select this if you are having a
....@@ -47,7 +79,6 @@
4779 
4880 config PCI_REALLOC_ENABLE_AUTO
4981 	bool "Enable PCI resource re-allocation detection"
50
-	depends on PCI
5182 	depends on PCI_IOV
5283 	help
5384 	  Say Y here if you want the PCI core to detect if PCI resource
....@@ -60,7 +91,6 @@
6091 
6192 config PCI_STUB
6293 	tristate "PCI Stub driver"
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-	depends on PCI
6494 	help
6595 	  Say Y or M here if you want be able to reserve a PCI device
6696 	  when it is going to be assigned to a guest operating system.
....@@ -69,25 +99,24 @@
6999 
70100 config PCI_PF_STUB
71101 	tristate "PCI PF Stub driver"
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-	depends on PCI
73102 	depends on PCI_IOV
74103 	help
75104 	  Say Y or M here if you want to enable support for devices that
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-	  require SR-IOV support, while at the same time the PF itself is
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-	  not providing any actual services on the host itself such as
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-	  storage or networking.
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+	  require SR-IOV support, while at the same time the PF (Physical
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+	  Function) itself is not providing any actual services on the
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+	  host itself such as storage or networking.
79108 
80109 	  When in doubt, say N.
81110 
82111 config XEN_PCIDEV_FRONTEND
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-        tristate "Xen PCI Frontend"
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-        depends on PCI && X86 && XEN
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-        select PCI_XEN
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+	tristate "Xen PCI Frontend"
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+	depends on X86 && XEN
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+	select PCI_XEN
86115 	select XEN_XENBUS_FRONTEND
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-        default y
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-        help
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-          The PCI device frontend driver allows the kernel to import arbitrary
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-          PCI devices from a PCI backend to support PCI driver domains.
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+	default y
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+	help
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+	  The PCI device frontend driver allows the kernel to import arbitrary
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+	  PCI devices from a PCI backend to support PCI driver domains.
91120 
92121 config PCI_ATS
93122 	bool
....@@ -98,9 +127,11 @@
98127 config PCI_LOCKLESS_CONFIG
99128 	bool
100129 
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+config PCI_BRIDGE_EMUL
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+	bool
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+
101133 config PCI_IOV
102134 	bool "PCI IOV support"
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-	depends on PCI
104135 	select PCI_ATS
105136 	help
106137 	  I/O Virtualization is a PCI feature supported by some devices
....@@ -111,7 +142,6 @@
111142 
112143 config PCI_PRI
113144 	bool "PCI PRI support"
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-	depends on PCI
115145 	select PCI_ATS
116146 	help
117147 	  PRI is the PCI Page Request Interface. It allows PCI devices that are
....@@ -121,7 +151,6 @@
121151 
122152 config PCI_PASID
123153 	bool "PCI PASID support"
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-	depends on PCI
125154 	select PCI_ATS
126155 	help
127156 	  Process Address Space Identifiers (PASIDs) can be used by PCI devices
....@@ -132,19 +161,100 @@
132161 
133162 	  If unsure, say N.
134163 
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+config PCI_P2PDMA
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+	bool "PCI peer-to-peer transfer support"
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+	depends on ZONE_DEVICE
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+	select GENERIC_ALLOCATOR
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+	help
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+	  Enableѕ drivers to do PCI peer-to-peer transactions to and from
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+	  BARs that are exposed in other devices that are the part of
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+	  the hierarchy where peer-to-peer DMA is guaranteed by the PCI
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+	  specification to work (ie. anything below a single PCI bridge).
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+
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+	  Many PCIe root complexes do not support P2P transactions and
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+	  it's hard to tell which support it at all, so at this time,
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+	  P2P DMA transactions must be between devices behind the same root
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+	  port.
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+
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+	  If unsure, say N.
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+
135181 config PCI_LABEL
136182 	def_bool y if (DMI || ACPI)
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-	depends on PCI
138183 	select NLS
139184 
140185 config PCI_HYPERV
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-        tristate "Hyper-V PCI Frontend"
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-        depends on PCI && X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
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-        help
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-          The PCI device frontend driver allows the kernel to import arbitrary
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-          PCI devices from a PCI backend to support PCI driver domains.
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+	tristate "Hyper-V PCI Frontend"
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+	depends on X86_64 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && SYSFS
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+	select PCI_HYPERV_INTERFACE
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+	help
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+	  The PCI device frontend driver allows the kernel to import arbitrary
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+	  PCI devices from a PCI backend to support PCI driver domains.
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+
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+choice
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+	prompt "PCI Express hierarchy optimization setting"
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+	default PCIE_BUS_DEFAULT
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+	depends on PCI && EXPERT
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+	help
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+	  MPS (Max Payload Size) and MRRS (Max Read Request Size) are PCIe
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+	  device parameters that affect performance and the ability to
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+	  support hotplug and peer-to-peer DMA.
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+
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+	  The following choices set the MPS and MRRS optimization strategy
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+	  at compile-time.  The choices are the same as those offered for
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+	  the kernel command-line parameter 'pci', i.e.,
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+	  'pci=pcie_bus_tune_off', 'pci=pcie_bus_safe',
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+	  'pci=pcie_bus_perf', and 'pci=pcie_bus_peer2peer'.
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+
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+	  This is a compile-time setting and can be overridden by the above
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+	  command-line parameters.  If unsure, choose PCIE_BUS_DEFAULT.
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+
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+config PCIE_BUS_TUNE_OFF
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+	bool "Tune Off"
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+	depends on PCI
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+	help
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+	  Use the BIOS defaults; don't touch MPS at all.  This is the same
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+	  as booting with 'pci=pcie_bus_tune_off'.
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+
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+config PCIE_BUS_DEFAULT
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+	bool "Default"
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+	depends on PCI
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+	help
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+	  Default choice; ensure that the MPS matches upstream bridge.
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+
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+config PCIE_BUS_SAFE
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+	bool "Safe"
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+	depends on PCI
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+	help
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+	  Use largest MPS that boot-time devices support.  If you have a
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+	  closed system with no possibility of adding new devices, this
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+	  will use the largest MPS that's supported by all devices.  This
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+	  is the same as booting with 'pci=pcie_bus_safe'.
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+
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+config PCIE_BUS_PERFORMANCE
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+	bool "Performance"
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+	depends on PCI
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+	help
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+	  Use MPS and MRRS for best performance.  Ensure that a given
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+	  device's MPS is no larger than its parent MPS, which allows us to
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+	  keep all switches/bridges to the max MPS supported by their
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+	  parent.  This is the same as booting with 'pci=pcie_bus_perf'.
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+
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+config PCIE_BUS_PEER2PEER
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+	bool "Peer2peer"
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+	depends on PCI
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+	help
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+	  Set MPS = 128 for all devices.  MPS configuration effected by the
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+	  other options could cause the MPS on one root port to be
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+	  different than that of the MPS on another, which may cause
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+	  hot-added devices or peer-to-peer DMA to fail.  Set MPS to the
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+	  smallest possible value (128B) system-wide to avoid these issues.
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+	  This is the same as booting with 'pci=pcie_bus_peer2peer'.
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+
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+endchoice
146254 
147255 source "drivers/pci/hotplug/Kconfig"
148256 source "drivers/pci/controller/Kconfig"
149257 source "drivers/pci/endpoint/Kconfig"
150258 source "drivers/pci/switch/Kconfig"
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+
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+endif