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Diffstat (limited to 'src/device/Kconfig')
| -rw-r--r-- | src/device/Kconfig | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/device/Kconfig b/src/device/Kconfig index cd8d8e9873..8471d5d00e 100644 --- a/src/device/Kconfig +++ b/src/device/Kconfig @@ -632,6 +632,35 @@ config PCIEXP_L1_SUB_STATE help Detect and enable ASPM on PCIe links. +config PCIEXP_SUPPORT_RESIZABLE_BARS + prompt "Support PCIe Resizable BARs" + bool + depends on (ECAM_MMCONF_SUPPORT || PCI_IO_CFG_EXT) + default n + help + When enabled, this will check PCIe devices for Resizable BAR support, + and if found, will use this to discover the preferred BAR sizes of + the device in preference over the traditional moving bits method. The + amount of address space given out to devices in this manner (since + it can range up to 8 EB) can be limited with the + PCIEXP_DEFAULT_MAX_RESIZABLE_BAR_BITS Kconfig setting below. + +if PCIEXP_SUPPORT_RESIZABLE_BARS + +config PCIEXP_DEFAULT_MAX_RESIZABLE_BAR_BITS + int "Bits of address space to give to Resizable BARs" + range 20 63 # 1 MiB - 8 EiB + default 29 # 512 MiB + help + This is the maximum number of bits of address space to allocate for + PCIe devices with resizable BARs. For instance, if a device requests + 30 bits of address space (1 GiB), but this field is set to 29, then + the device will only be allocated 29 bits worth of address space (512 + MiB). Valid values range from 20 (1 MiB) to 63 (8 EiB); these come + from the Resizable BAR portion of the PCIe spec (7.8.6). + +endif # PCIEXP_SUPPORT_RESIZABLE_BARS + config PCIEXP_HOTPLUG prompt "Enable PCIe Hotplug Support" bool |