diff options
author | Chris Wright <chrisw@sous-sol.org> | 2009-12-04 15:15:21 -0500 |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-12-04 19:19:24 -0500 |
commit | 5d990b627537e59a3a2f039ff588a4750e9c1a6a (patch) | |
tree | 8c0e723c3f9146da52b30c087a80fc417df2b41b /drivers/pci/dmar.c | |
parent | b26a34aa4792b3db2500b8a98cb7702765c1a92e (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 'drivers/pci/dmar.c')
-rw-r--r-- | drivers/pci/dmar.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c index e01ca4d6b3e6..0e98f6b6f515 100644 --- a/drivers/pci/dmar.c +++ b/drivers/pci/dmar.c | |||
@@ -614,8 +614,11 @@ void __init detect_intel_iommu(void) | |||
614 | #endif | 614 | #endif |
615 | #ifdef CONFIG_DMAR | 615 | #ifdef CONFIG_DMAR |
616 | if (ret && !no_iommu && !iommu_detected && !swiotlb && | 616 | if (ret && !no_iommu && !iommu_detected && !swiotlb && |
617 | !dmar_disabled) | 617 | !dmar_disabled) { |
618 | iommu_detected = 1; | 618 | iommu_detected = 1; |
619 | /* Make sure ACS will be enabled */ | ||
620 | pci_request_acs(); | ||
621 | } | ||
619 | #endif | 622 | #endif |
620 | } | 623 | } |
621 | early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size); | 624 | early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size); |