lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

intel-iommu: Restore DMAR_BROKEN_GFX_WA option for broken graphics drivers

Browse Source 
We need to give people a little more time to fix the broken drivers.
Re-introduce this, but tied in properly with the 'iommu=pt' support this
time. Change the config option name and make it default to 'no' too.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse
2009-07-04 10:59:46 +01:00
parent 40e4aa3432
commit 62edf5dc4a
2 changed files with 31 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/pci/intel-iommu.c
View File

@@ -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.*/