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| author | Laurentiu Tudor <laurentiu.tudor@nxp.com> | 2020-09-10 12:42:19 +0300 |
|---|---|---|
| committer | Priyanka Jain <priyanka.jain@nxp.com> | 2020-10-23 14:22:09 +0300 |
| commit | 2a5bbb13cc39102a68fcc31056925427ab44b591 (patch) | |
| tree | 92058ae49ee90cf24dd555bc0d059a452eca1cce /drivers/pci/Kconfig | |
| parent | 284d062ef1edda752eadd5aa8cb1df37c76dd272 (diff) | |
| download | u-boot-2a5bbb13cc39102a68fcc31056925427ab44b591.tar.xz | |
pci: layerscape: add a way of specifying additional iommu mappings
In the current implementation, u-boot creates iommu mappings only
for PCI devices enumarated at boot time thus does not take into
account more dynamic scenarios such as SR-IOV or PCI hot-plug.
Add an u-boot env var and a device tree property (to be used for
example in more static scenarios such as hardwired PCI endpoints
that get initialized later in the system setup) that would allow
two things:
- for a SRIOV capable PCI EP identified by its B.D.F specify
the maximum number of VFs that will ever be created for it
- for hot-plug case, specify the B.D.F with which the device
will show up on the PCI bus
More details can be found in the included documentation:
arch/arm/cpu/armv8/fsl-layerscape/doc/README.pci_iommu_extra
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
Diffstat (limited to 'drivers/pci/Kconfig')
| -rw-r--r-- | drivers/pci/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index dd1cc65229..af92784950 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -179,6 +179,18 @@ config PCIE_LAYERSCAPE_RC configured to Root Complex mode by clearing the corresponding bit of RCW[HOST_AGT_PEX]. +config PCI_IOMMU_EXTRA_MAPPINGS + bool "Support for specifying extra IOMMU mappings for PCI" + depends on PCIE_LAYERSCAPE_RC + help + Enable support for specifying extra IOMMU mappings for PCI + controllers through a special env var called "pci_iommu_extra" or + through a device tree property named "pci-iommu-extra" placed in + the node describing the PCI controller. + The intent is to cover SR-IOV scenarios which need mappings for VFs + and PCI hot-plug scenarios. More documentation can be found under: + arch/arm/cpu/armv8/fsl-layerscape/doc/README.pci_iommu_extra + config PCIE_LAYERSCAPE_EP bool "Layerscape PCIe Endpoint mode support" depends on DM_PCI |