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powerpc/eeh: Fetch IOMMU table in reliable way

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Function eeh_iommu_group_to_pe() iterates each PCI device to check
the binding IOMMU group with get_iommu_table_base(), which possibly
fetches pdev->dev.archdata.dma_data.dma_offset. It's (0x1 << 59)
for "bypass" cases.

The patch fixes the issue by iterating devices hooked to the IOMMU
group and fetch IOMMU table there.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2014-07-15 17:00:56 +10:00 committed by Benjamin Herrenschmidt
parent dff4a39e88
commit a3032ca9f8
1 changed files with 22 additions and 11 deletions
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33
arch/powerpc/kernel/eeh.c
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@ -27,6 +27,7 @@
#include <linux/init.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/iommu.h>
#include <linux/proc_fs.h>
#include <linux/rbtree.h>
#include <linux/reboot.h>
@ -1178,6 +1179,24 @@ void eeh_dev_release(struct pci_dev *pdev)
}
EXPORT_SYMBOL(eeh_dev_release);
static int dev_has_iommu_table(struct device *dev, void *data)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct pci_dev **ppdev = data;
struct iommu_table *tbl;
if (!dev)
return 0;
tbl = get_iommu_table_base(dev);
if (tbl && tbl->it_group) {
*ppdev = pdev;
return 1;
}
return 0;
}
/**
* eeh_iommu_group_to_pe - Convert IOMMU group to EEH PE
* @group: IOMMU group
@ -1186,24 +1205,16 @@ EXPORT_SYMBOL(eeh_dev_release);
*/
struct eeh_pe *eeh_iommu_group_to_pe(struct iommu_group *group)
{
struct iommu_table *tbl;
struct pci_dev *pdev = NULL;
struct eeh_dev *edev;
bool found = false;
int ret;
/* No IOMMU group ? */
if (!group)
return NULL;
/* No PCI device ? */
for_each_pci_dev(pdev) {
tbl = get_iommu_table_base(&pdev->dev);
if (tbl && tbl->it_group == group) {
found = true;
break;
}
}
if (!found)
ret = iommu_group_for_each_dev(group, &pdev, dev_has_iommu_table);
if (!ret || !pdev)
return NULL;
/* No EEH device or PE ? */