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authorChris Wright <chrisw@sous-sol.org>2009-12-04 12:15:21 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-12-04 16:19:24 -0800
commit5d990b627537e59a3a2f039ff588a4750e9c1a6a (patch)
tree8c0e723c3f9146da52b30c087a80fc417df2b41b /include/linux/pci.h
parentb26a34aa4792b3db2500b8a98cb7702765c1a92e (diff)
PCI: add pci_request_acs
Commit ae21ee65e8bc228416bbcc8a1da01c56a847a60c "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: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include/linux/pci.h')
-rw-r--r--include/linux/pci.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 2891c3d3e51a..04771b9c3316 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1328,5 +1328,7 @@ static inline bool pci_is_pcie(struct pci_dev *dev)
return !!pci_pcie_cap(dev);
}
+void pci_request_acs(void);
+
#endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */