On Thu, Aug 01, 2024 at 06:43:59PM -0500, Bjorn Helgaas wrote: > [+cc ARM, IOMMU folks; I don't know the answer, but maybe they do] [+cc Vidya, Pavan, also see this recent thread: https://lore.kernel.org/r/PH8PR12MB667446D4A4CAD6E0A2F488B5B83F2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx] > On Fri, Jul 19, 2024 at 11:01:11PM +0800, steven wrote: > > Hello, > > > > I am a new person in PCI, I am trying to do something for iommu > > group on arm64 platform, I found if I boot the linux (5.10 kernel) > > kernel using UEFI + ACPI, it will work correctly. But if I boot it > > using UEFI + DTB, the iommu group not work, only one group present. > > > > I read the code, found that pci_acs_enable is set to 1 during > > acpi_init, but I can not find any code for dtb booting, so it will > > return "disable_acs_redir " during call pci_enable_acs. > > > > static void pci_enable_acs(struct pci_dev *dev) > > { > > if (!pci_acs_enable) > > goto disable_acs_redir; > > > > if (!pci_dev_specific_enable_acs(dev)) > > goto disable_acs_redir; > > > > pci_std_enable_acs(dev); > > > > > > > > > > SO, is it not support in dtb? > >
