Subject: [patch][Intel-IOMMU] Fix for IOMMU early crash
pci_dev's->sysdata is highly overloaded and currently
IOMMU is broken due to IOMMU code depending on this field.
This patch introduces new field in pci_dev's struct to
hold IOMMU specific per device IOMMU private data.
Signed-off-by: Anil S Keshavamurthy <[email protected]>
---
drivers/pci/intel-iommu.c | 22 +++++++++++-----------
include/linux/pci.h | 1 +
2 files changed, 12 insertions(+), 11 deletions(-)
Index: 2.6-mm/drivers/pci/intel-iommu.c
===================================================================
--- 2.6-mm.orig/drivers/pci/intel-iommu.c 2007-10-03 13:48:18.000000000 -0700
+++ 2.6-mm/drivers/pci/intel-iommu.c 2007-10-03 13:48:41.000000000 -0700
@@ -1348,7 +1348,7 @@
list_del(&info->link);
list_del(&info->global);
if (info->dev)
- info->dev->sysdata = NULL;
+ info->dev->iommu_private = NULL;
spin_unlock_irqrestore(&device_domain_lock, flags);
detach_domain_for_dev(info->domain, info->bus, info->devfn);
@@ -1361,7 +1361,7 @@
/*
* find_domain
- * Note: we use struct pci_dev->sysdata stores the info
+ * Note: we use struct pci_dev->iommu_private stores the info
*/
struct dmar_domain *
find_domain(struct pci_dev *pdev)
@@ -1369,7 +1369,7 @@
struct device_domain_info *info;
/* No lock here, assumes no domain exit in normal case */
- info = pdev->sysdata;
+ info = pdev->iommu_private;
if (info)
return info->domain;
return NULL;
@@ -1519,7 +1519,7 @@
}
list_add(&info->link, &domain->devices);
list_add(&info->global, &device_domain_list);
- pdev->sysdata = info;
+ pdev->iommu_private = info;
spin_unlock_irqrestore(&device_domain_lock, flags);
return domain;
error:
@@ -1579,7 +1579,7 @@
static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr,
struct pci_dev *pdev)
{
- if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO)
+ if (pdev->iommu_private == DUMMY_DEVICE_DOMAIN_INFO)
return 0;
return iommu_prepare_identity_map(pdev, rmrr->base_address,
rmrr->end_address + 1);
@@ -1595,7 +1595,7 @@
int ret;
for_each_pci_dev(pdev) {
- if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO ||
+ if (pdev->iommu_private == DUMMY_DEVICE_DOMAIN_INFO ||
!IS_GFX_DEVICE(pdev))
continue;
printk(KERN_INFO "IOMMU: gfx device %s 1-1 mapping\n",
@@ -1836,7 +1836,7 @@
int prot = 0;
BUG_ON(dir == DMA_NONE);
- if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO)
+ if (pdev->iommu_private == DUMMY_DEVICE_DOMAIN_INFO)
return virt_to_bus(addr);
domain = get_valid_domain_for_dev(pdev);
@@ -1900,7 +1900,7 @@
unsigned long start_addr;
struct iova *iova;
- if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO)
+ if (pdev->iommu_private == DUMMY_DEVICE_DOMAIN_INFO)
return;
domain = find_domain(pdev);
BUG_ON(!domain);
@@ -1974,7 +1974,7 @@
size_t size = 0;
void *addr;
- if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO)
+ if (pdev->iommu_private == DUMMY_DEVICE_DOMAIN_INFO)
return;
domain = find_domain(pdev);
@@ -2032,7 +2032,7 @@
unsigned long start_addr;
BUG_ON(dir == DMA_NONE);
- if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO)
+ if (pdev->iommu_private == DUMMY_DEVICE_DOMAIN_INFO)
return intel_nontranslate_map_sg(hwdev, sg, nelems, dir);
domain = get_valid_domain_for_dev(pdev);
@@ -2234,7 +2234,7 @@
for (i = 0; i < drhd->devices_cnt; i++) {
if (!drhd->devices[i])
continue;
- drhd->devices[i]->sysdata = DUMMY_DEVICE_DOMAIN_INFO;
+ drhd->devices[i]->iommu_private = DUMMY_DEVICE_DOMAIN_INFO;
}
}
}
Index: 2.6-mm/include/linux/pci.h
===================================================================
--- 2.6-mm.orig/include/linux/pci.h 2007-10-03 13:48:20.000000000 -0700
+++ 2.6-mm/include/linux/pci.h 2007-10-03 13:49:08.000000000 -0700
@@ -195,6 +195,7 @@
#ifdef CONFIG_PCI_MSI
struct list_head msi_list;
#endif
+ void *iommu_private; /* hook for IOMMU specific extension */
};
extern struct pci_dev *alloc_pci_dev(void);
-
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