Messages in this thread Patch in this message | | | Date | Sun, 27 May 2012 10:05:50 +0900 | From | Greg KH <> | Subject | [ 87/94] intel-iommu: Add device info into list before doing context mapping |
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3.3-stable review patch. If anyone has any objections, please let me know.
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From: David Woodhouse <dwmw2@infradead.org>
commit e2ad23d04c1304431ab5176c89b7b476ded2d995 upstream.
Add device info into list before doing context mapping, because device info will be used by iommu_enable_dev_iotlb(). Without it, ATS won't get enabled as it should be.
ATS, while a dubious decision from a security point of view, can be very important for performance.
Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Acked-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/iommu/intel-iommu.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2280,12 +2280,6 @@ static int domain_add_dev_info(struct dm if (!info) return -ENOMEM; - ret = domain_context_mapping(domain, pdev, translation); - if (ret) { - free_devinfo_mem(info); - return ret; - } - info->segment = pci_domain_nr(pdev->bus); info->bus = pdev->bus->number; info->devfn = pdev->devfn; @@ -2298,6 +2292,17 @@ static int domain_add_dev_info(struct dm pdev->dev.archdata.iommu = info; spin_unlock_irqrestore(&device_domain_lock, flags); + ret = domain_context_mapping(domain, pdev, translation); + if (ret) { + spin_lock_irqsave(&device_domain_lock, flags); + list_del(&info->link); + list_del(&info->global); + pdev->dev.archdata.iommu = NULL; + spin_unlock_irqrestore(&device_domain_lock, flags); + free_devinfo_mem(info); + return ret; + } + return 0; }
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