Hello, On Fri, Jul 22, 2022 at 10:06:54PM +0200, Simon Richter wrote: > would it be possible to enable this option to allow PCIe devices to do > direct data transfers?
Enabling it for amd64 and ppc64el would be done by the following change: diff --git a/debian/config/amd64/config b/debian/config/amd64/config index 42ac252164f1..c4b37af83061 100644 --- a/debian/config/amd64/config +++ b/debian/config/amd64/config @@ -194,6 +194,7 @@ CONFIG_NVDIMM_PFN=y ## ## file: drivers/pci/Kconfig ## +CONFIG_PCI_P2PDMA=y CONFIG_PCI_HYPERV=y ## diff --git a/debian/config/kernelarch-powerpc/config-arch-64-le b/debian/config/kernelarch-powerpc/config-arch-64-le index 14a2e754d39e..d0503b3e17f6 100644 --- a/debian/config/kernelarch-powerpc/config-arch-64-le +++ b/debian/config/kernelarch-powerpc/config-arch-64-le @@ -28,6 +28,11 @@ CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y ## CONFIG_CXL_BUS=y +## +## file: drivers/pci/Kconfig +## +CONFIG_PCI_P2PDMA=y + ## ## file: drivers/pcmcia/Kconfig ## @@ -38,3 +43,8 @@ CONFIG_CXL_BUS=y ## #. See #789070 # CONFIG_HIBERNATION is not set + +## +## file: mm/Kconfig +## +CONFIG_ZONE_DEVICE=y ZONE_DEVICE is a direct dependency of PCI_P2PDMA that isn't currently enabled on ppc64el. I hesitate to actually enable it because I don't understand PCI good enough to judge it's a safe choice for the Debian kernel. Also I wonder about "If unsure, say N" in the Kconfig help text. Is this only because people who benefit from this setting are expected to be sure? Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | https://www.pengutronix.de/ |
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