Drop custom code that attempts to do the exact same thing and use
PCI provided isolation root support. Existing IOMMU group laytout
should not change.
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: David Woodhouse <David.Woodhouse@xxxxxxxxx>
---
drivers/iommu/intel-iommu.c | 71 +++++--------------------------------------
1 file changed, 8 insertions(+), 63 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index f256ffc..f0e50f1 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -44,7 +44,6 @@
#include <asm/iommu.h>
#include "irq_remapping.h"
-#include "pci.h"
#define ROOT_SIZE VTD_PAGE_SIZE
#define CONTEXT_SIZE VTD_PAGE_SIZE
@@ -4359,12 +4358,9 @@ static int intel_iommu_domain_has_cap(struct iommu_domain *domain,
return 0;
}
-#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
-
static int intel_iommu_add_device(struct device *dev)
{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct pci_dev *bridge, *dma_pdev = NULL;
+ struct pci_dev *pdev;
struct iommu_group *group;
int ret;
u8 bus, devfn;
@@ -4372,68 +4368,16 @@ static int intel_iommu_add_device(struct device *dev)
if (!device_to_iommu(dev, &bus, &devfn))
return -ENODEV;
- bridge = pci_find_upstream_pcie_bridge(pdev);
- if (bridge) {
- if (pci_is_pcie(bridge))
- dma_pdev = pci_get_domain_bus_and_slot(
- pci_domain_nr(pdev->bus),
- bridge->subordinate->number, 0);
- if (!dma_pdev)
- dma_pdev = pci_dev_get(bridge);
- } else
- dma_pdev = pci_dev_get(pdev);
-
- /* Account for quirked devices */
- swap_pci_ref(&dma_pdev, pci_get_dma_source(dma_pdev));
-
- /*
- * If it's a multifunction device that does not support our
- * required ACS flags, add to the same group as lowest numbered
- * function that also does not suport the required ACS flags.
- */
- if (dma_pdev->multifunction &&
- !pci_acs_enabled(dma_pdev, REQ_ACS_FLAGS)) {
- u8 i, slot = PCI_SLOT(dma_pdev->devfn);
-
- for (i = 0; i < 8; i++) {
- struct pci_dev *tmp;
-
- tmp = pci_get_slot(dma_pdev->bus, PCI_DEVFN(slot, i));
- if (!tmp)
- continue;
-
- if (!pci_acs_enabled(tmp, REQ_ACS_FLAGS)) {
- swap_pci_ref(&dma_pdev, tmp);
- break;
- }
- pci_dev_put(tmp);
- }
+ group = iommu_group_get(dev);
+ if (group) {
+ iommu_group_put(group);
+ return 0;
}
- /*
- * Devices on the root bus go through the iommu. If that's not us,
- * find the next upstream device and test ACS up to the root bus.
- * Finding the next device may require skipping virtual buses.
- */
- while (!pci_is_root_bus(dma_pdev->bus)) {
- struct pci_bus *bus = dma_pdev->bus;
+ pdev = pci_find_dma_isolation_root(to_pci_dev(dev));
- while (!bus->self) {
- if (!pci_is_root_bus(bus))
- bus = bus->parent;
- else
- goto root_bus;
- }
+ group = iommu_group_get(&pdev->dev);
- if (pci_acs_path_enabled(bus->self, NULL, REQ_ACS_FLAGS))
- break;
-
- swap_pci_ref(&dma_pdev, pci_dev_get(bus->self));
- }
-
-root_bus:
- group = iommu_group_get(&dma_pdev->dev);
- pci_dev_put(dma_pdev);
if (!group) {
group = iommu_group_alloc();
if (IS_ERR(group))
@@ -4443,6 +4387,7 @@ root_bus:
ret = iommu_group_add_device(group, dev);
iommu_group_put(group);
+
return ret;
}
--
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