diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2012-05-31 17:38:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-10 00:36:18 +0900 |
| commit | 98e69566e80c4de231456dbf4e6735ddfeb599db (patch) | |
| tree | 5c517e4d1ef930efc48f4be2a44d60059ca65dcd /drivers | |
| parent | fab83a044aa7d4b968f466f4eb3946388528497a (diff) | |
iommu/amd: Cache pdev pointer to root-bridge
commit c1bf94ec1e12d76838ad485158aecf208ebd8fb9 upstream.
At some point pci_get_bus_and_slot started to enable
interrupts. Since this function is used in the
amd_iommu_resume path it will enable interrupts on resume
which causes a warning. The fix will use a cached pointer
to the root-bridge to re-enable the IOMMU in case the BIOS
is broken.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 13 | ||||
| -rw-r--r-- | drivers/iommu/amd_iommu_types.h | 3 |
2 files changed, 8 insertions, 8 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index c56790375e0..542024ba6db 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -1029,6 +1029,9 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h) if (!iommu->dev) return 1; + iommu->root_pdev = pci_get_bus_and_slot(iommu->dev->bus->number, + PCI_DEVFN(0, 0)); + iommu->cap_ptr = h->cap_ptr; iommu->pci_seg = h->pci_seg; iommu->mmio_phys = h->mmio_phys; @@ -1323,20 +1326,16 @@ static void iommu_apply_resume_quirks(struct amd_iommu *iommu) { int i, j; u32 ioc_feature_control; - struct pci_dev *pdev = NULL; + struct pci_dev *pdev = iommu->root_pdev; /* RD890 BIOSes may not have completely reconfigured the iommu */ - if (!is_rd890_iommu(iommu->dev)) + if (!is_rd890_iommu(iommu->dev) || !pdev) return; /* * First, we need to ensure that the iommu is enabled. This is * controlled by a register in the northbridge */ - pdev = pci_get_bus_and_slot(iommu->dev->bus->number, PCI_DEVFN(0, 0)); - - if (!pdev) - return; /* Select Northbridge indirect register 0x75 and enable writing */ pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7)); @@ -1346,8 +1345,6 @@ static void iommu_apply_resume_quirks(struct amd_iommu *iommu) if (!(ioc_feature_control & 0x1)) pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1); - pci_dev_put(pdev); - /* Restore the iommu BAR */ pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4, iommu->stored_addr_lo); diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h index 2452f3b7173..24355559a2a 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -481,6 +481,9 @@ struct amd_iommu { /* Pointer to PCI device of this IOMMU */ struct pci_dev *dev; + /* Cache pdev to root device for resume quirks */ + struct pci_dev *root_pdev; + /* physical address of MMIO space */ u64 mmio_phys; /* virtual address of MMIO space */ |