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    Subject[PATCH 2/2] pciehp_driver.c: PCIe hot plug for Intel iommu - call IOMMU API in hot remove
    IOMMU API iommu_detach_devcie() is called to hot remove a PCIe device.

    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.

    Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>

    ---

    drivers/pci/pci-driver.c | 8 ++++++++
    1 files changed, 8 insertions(+)

    diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
    index e5d47be..b8f0592 100644
    --- a/drivers/pci/pci-driver.c
    +++ b/drivers/pci/pci-driver.c
    @@ -17,6 +17,7 @@
    #include <linux/slab.h>
    #include <linux/sched.h>
    #include <linux/cpu.h>
    +#include <linux/iommu.h>
    #include "pci.h"

    struct pci_dynid {
    @@ -390,6 +391,13 @@ static int pci_device_remove(struct device * dev)
    */

    pci_dev_put(pci_dev);
    +
    + /*
    + * Remove this pci device from its iommu domain.
    + */
    + if (iommu_found())
    + iommu_detach_device(NULL, dev);
    +
    return 0;
    }


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