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iommu/fsl: Use iommu_group_get_for_dev() for IOMMU groups 

Drop custom code and use IOMMU provided grouping support for PCI.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Varun Sethi <varun.sethi@freescale.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Alex Williamson 2014-07-03 09:51:49 -06:00 committed by Joerg Roedel
parent 579305f75d
commit 7319eded2e
1 changed files with 1 additions and 65 deletions
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66
drivers/iommu/fsl_pamu_domain.c
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@ -38,7 +38,6 @@
#include <sysdev/fsl_pci.h>
#include "fsl_pamu_domain.h"
#include "pci.h"
/*
* Global spinlock that needs to be held while
@ -892,8 +891,6 @@ static int fsl_pamu_get_domain_attr(struct iommu_domain *domain,
return ret;
}
#define REQ_ACS_FLAGS (PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF)
static struct iommu_group *get_device_iommu_group(struct device *dev)
{
struct iommu_group *group;
@ -950,74 +947,13 @@ static struct iommu_group *get_pci_device_group(struct pci_dev *pdev)
struct pci_controller *pci_ctl;
bool pci_endpt_partioning;
struct iommu_group *group = NULL;
struct pci_dev *bridge, *dma_pdev = NULL;
pci_ctl = pci_bus_to_host(pdev->bus);
pci_endpt_partioning = check_pci_ctl_endpt_part(pci_ctl);
/* We can partition PCIe devices so assign device group to the device */
if (pci_endpt_partioning) {
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);
group = iommu_group_get_for_dev(&pdev->dev);
/* 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);
}
}
/*
* 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;
while (!bus->self) {
if (!pci_is_root_bus(bus))
bus = bus->parent;
else
goto root_bus;
}
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 = get_device_iommu_group(&dma_pdev->dev);
pci_dev_put(dma_pdev);
/*
* PCIe controller is not a paritionable entity
* free the controller device iommu_group.