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-rw-r--r--arch/x86/Kconfig12
-rw-r--r--drivers/pci/intel-iommu.c29
2 files changed, 31 insertions, 10 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c07f72205909..738bdc6b0f8b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1913,6 +1913,18 @@ config DMAR_DEFAULT_ON
recommended you say N here while the DMAR code remains
experimental.
+config DMAR_BROKEN_GFX_WA
+ def_bool n
+ prompt "Workaround broken graphics drivers (going away soon)"
+ depends on DMAR
+ ---help---
+ Current Graphics drivers tend to use physical address
+ for DMA and avoid using DMA APIs. Setting this config
+ option permits the IOMMU driver to set a unity map for
+ all the OS-visible memory. Hence the driver can continue
+ to use physical addresses for DMA, at least until this
+ option is removed in the 2.6.32 kernel.
+
config DMAR_FLOPPY_WA
def_bool y
depends on DMAR
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index ae5ccdf8b19f..5ee8305257ea 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2127,16 +2127,18 @@ static int iommu_prepare_static_identity_mapping(void)
return -EFAULT;
for_each_pci_dev(pdev) {
- printk(KERN_INFO "IOMMU: identity mapping for device %s\n",
- pci_name(pdev));
+ if (iommu_identity_mapping == 1 || IS_GFX_DEVICE(pdev)) {
+ printk(KERN_INFO "IOMMU: identity mapping for device %s\n",
+ pci_name(pdev));
- ret = domain_context_mapping(si_domain, pdev,
- CONTEXT_TT_MULTI_LEVEL);
- if (ret)
- return ret;
- ret = domain_add_dev_info(si_domain, pdev);
- if (ret)
- return ret;
+ ret = domain_context_mapping(si_domain, pdev,
+ CONTEXT_TT_MULTI_LEVEL);
+ if (ret)
+ return ret;
+ ret = domain_add_dev_info(si_domain, pdev);
+ if (ret)
+ return ret;
+ }
}
return 0;
@@ -2291,6 +2293,10 @@ int __init init_dmars(void)
* identity mapping if iommu_identity_mapping is set.
*/
if (!iommu_pass_through) {
+#ifdef CONFIG_DMAR_BROKEN_GFX_WA
+ if (!iommu_identity_mapping)
+ iommu_identity_mapping = 2;
+#endif
if (iommu_identity_mapping)
iommu_prepare_static_identity_mapping();
/*
@@ -2444,7 +2450,10 @@ static int iommu_dummy(struct pci_dev *pdev)
static int iommu_should_identity_map(struct pci_dev *pdev)
{
- return pdev->dma_mask > DMA_BIT_MASK(32);
+ if (iommu_identity_mapping == 2)
+ return IS_GFX_DEVICE(pdev);
+ else
+ return pdev->dma_mask > DMA_BIT_MASK(32);
}
/* Check if the pdev needs to go through non-identity map and unmap process.*/