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Date: Thu, 01 May 2014 10:28:06 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc: bhelgaas@...gle.com, Varun Sethi <varun.sethi@...escale.com>,
acooks@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH 10/13] iommu/fsl: Use pci_find_dma_isolation_root() for
IOMMU groups
Drop custom code and use PCI provided isolation root support.
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Cc: Varun Sethi <varun.sethi@...escale.com>
---
drivers/iommu/fsl_pamu_domain.c | 67 ++-------------------------------------
1 file changed, 3 insertions(+), 64 deletions(-)
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 93072ba..83e3e7c 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -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 +947,16 @@ 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;
+ struct pci_dev *dma_pdev;
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);
-
- /* 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);
+ dma_pdev = pci_find_dma_isolation_root(pdev);
- 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.
--
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