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    PCI: add pci_request_acs · 5d990b62
    Chris Wright 提交于
    Commit ae21ee65 "PCI: acs p2p upsteram
    forwarding enabling" doesn't actually enable ACS.
    
    Add a function to pci core to allow an IOMMU to request that ACS
    be enabled.  The existing mechanism of using iommu_found() in the pci
    core to know when ACS should be enabled doesn't actually work due to
    initialization order;  iommu has only been detected not initialized.
    
    Have Intel and AMD IOMMUs request ACS, and Xen does as well during early
    init of dom0.
    
    Cc: Allen Kay <allen.m.kay@intel.com>
    Cc: David Woodhouse <dwmw2@infradead.org>
    Cc: Jeremy Fitzhardinge <jeremy@goop.org>
    Cc: Joerg Roedel <joerg.roedel@amd.com>
    Signed-off-by: NChris Wright <chrisw@sous-sol.org>
    Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
    5d990b62
dmar.c 32.0 KB