Commit 99dcaded authored by Fenghua Yu's avatar Fenghua Yu Committed by David Woodhouse

intel-iommu: Support PCIe hot-plug

To support PCIe hot plug in IOMMU, we register a notifier to respond to device
change action.

When the notifier gets BUS_NOTIFY_UNBOUND_DRIVER, it removes the device
from its DMAR domain.

A hot added device will be added into an IOMMU domain when it first does IOMMU
op. So there is no need to add more code for hot add.

Without the patch, after a hot-remove, a hot-added device on the same
slot will not work.
Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
Tested-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent e8bb910d
...@@ -3215,6 +3215,33 @@ static int __init init_iommu_sysfs(void) ...@@ -3215,6 +3215,33 @@ static int __init init_iommu_sysfs(void)
} }
#endif /* CONFIG_PM */ #endif /* CONFIG_PM */
/*
* Here we only respond to action of unbound device from driver.
*
* Added device is not attached to its DMAR domain here yet. That will happen
* when mapping the device to iova.
*/
static int device_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
struct pci_dev *pdev = to_pci_dev(dev);
struct dmar_domain *domain;
domain = find_domain(pdev);
if (!domain)
return 0;
if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through)
domain_remove_one_dev_info(domain, pdev);
return 0;
}
static struct notifier_block device_nb = {
.notifier_call = device_notifier,
};
int __init intel_iommu_init(void) int __init intel_iommu_init(void)
{ {
int ret = 0; int ret = 0;
...@@ -3267,6 +3294,8 @@ int __init intel_iommu_init(void) ...@@ -3267,6 +3294,8 @@ int __init intel_iommu_init(void)
register_iommu(&intel_iommu_ops); register_iommu(&intel_iommu_ops);
bus_register_notifier(&pci_bus_type, &device_nb);
return 0; return 0;
} }
......
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