On Wed, Jan 01, 2020 at 01:26:46PM +0800, Lu Baolu wrote: > The new parameter takes a list of devices separated by a semicolon. > Each device specified will have its iommu_passthrough bit in struct > device set. This is very similar to the existing 'disable_acs_redir' > parameter. > > Signed-off-by: Lu Baolu <[email protected]> > --- > .../admin-guide/kernel-parameters.txt | 5 +++ > drivers/pci/pci.c | 34 +++++++++++++++++++ > drivers/pci/pci.h | 1 + > drivers/pci/probe.c | 2 ++ > 4 files changed, 42 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt > b/Documentation/admin-guide/kernel-parameters.txt > index ade4e6ec23e0..d3edc2cb6696 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -3583,6 +3583,11 @@ > may put more devices in an IOMMU group. > force_floating [S390] Force usage of floating interrupts. > nomio [S390] Do not use MIO instructions. > + iommu_passthrough=<pci_dev>[; ...] > + Specify one or more PCI devices (in the format > + specified above) separated by semicolons. > + Each device specified will bypass IOMMU DMA > + translation. > > pcie_aspm= [PCIE] Forcibly enable or disable PCIe Active State > Power > Management. > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index 90dbd7c70371..05bf3f4acc36 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -6401,6 +6401,37 @@ void __weak pci_fixup_cardbus(struct pci_bus *bus) > } > EXPORT_SYMBOL(pci_fixup_cardbus); > > +static const char *iommu_passthrough_param; > +bool pci_iommu_passthrough_match(struct pci_dev *dev) > +{ > + int ret = 0; > + const char *p = iommu_passthrough_param; > + > + if (!p) > + return false; > + > + while (*p) { > + ret = pci_dev_str_match(dev, p, &p); > + if (ret < 0) { > + pr_info_once("PCI: Can't parse iommu_passthrough > parameter: %s\n", > + iommu_passthrough_param); > + > + break; > + } else if (ret == 1) { > + pci_info(dev, "PCI: IOMMU passthrough\n"); > + return true; > + } > + > + if (*p != ';' && *p != ',') { > + /* End of param or invalid format */ > + break; > + } > + p++; > + } > + > + return false; > +}
This duplicates a lot of the code in pci_disable_acs_redir(). That needs to be factored out somehow so we don't duplicate it. Bjorn _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
