Messages in this thread Patch in this message | | | From | Mateusz Jończyk <> | Subject | [PATCH v2 07/10] x86/Kconfig: document CONFIG_PCI_MMCONFIG | Date | Sun, 11 Sep 2022 10:47:08 +0200 |
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This configuration option had no help text, so add it.
CONFIG_EXPERT is enabled on some distribution kernels, so people using a distribution kernel's configuration as a starting point will see this option.
Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: x86@kernel.org Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Jan Kiszka <jan.kiszka@siemens.com>
--- I would like someone to confirm that PCI Express is required for MMCONFIG support. --- arch/x86/Kconfig | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 31c2c574c67d..fdfe8b7e895a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2712,6 +2712,19 @@ config PCI_MMCONFIG default y depends on PCI && (ACPI || JAILHOUSE_GUEST) depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG) + help + Add support for accessing the PCI configuration space as a memory + mapped area. It is the recommended method if the system supports + this (it must have PCI Express and ACPI for it to be available). + + In the unlikely case that enabling this configuration option causes + problems, the mechanism can be switched off with the 'pci=nommconf' + command line parameter. + + Say 'n' only if you are sure that your platform does not support this + access method or you have problems caused by it. + + Say 'y' otherwise. config PCI_OLPC def_bool y -- 2.25.1
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