A parent device might create different types of mediated devices. For example, a mediated device could be created on the parent device with a PASID tagged. When the iommu supports PASID-granular translations, the mediated device is individually protected and isolated by the iommu. It's hence possible to allocate a domain for each such device.
This patch defines the domain types of a mediated device and allows the parent driver to specify this attribute after a mdev is actually created. Cc: Ashok Raj <[email protected]> Cc: Jacob Pan <[email protected]> Cc: Kevin Tian <[email protected]> Cc: Liu Yi L <[email protected]> Suggested-by: Kevin Tian <[email protected]> Signed-off-by: Lu Baolu <[email protected]> --- drivers/vfio/mdev/mdev_core.c | 21 +++++++++++++++++++++ drivers/vfio/mdev/mdev_private.h | 1 + include/linux/mdev.h | 22 ++++++++++++++++++++++ 3 files changed, 44 insertions(+) diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index d8f19ba..4d82b36 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -391,6 +391,27 @@ int mdev_device_remove(struct device *dev, bool force_remove) return 0; } +int mdev_set_domain_type(struct device *dev, enum mdev_domain_type type) +{ + struct mdev_device *mdev = to_mdev_device(dev); + + if (type == DOMAIN_TYPE_PRIVATE && !iommu_present(&mdev_bus_type)) + return -EINVAL; + + mdev->domain_type = type; + + return 0; +} +EXPORT_SYMBOL(mdev_set_domain_type); + +enum mdev_domain_type mdev_get_domain_type(struct device *dev) +{ + struct mdev_device *mdev = to_mdev_device(dev); + + return mdev->domain_type; +} +EXPORT_SYMBOL(mdev_get_domain_type); + static int __init mdev_init(void) { int ret; diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h index b5819b7..d47a670 100644 --- a/drivers/vfio/mdev/mdev_private.h +++ b/drivers/vfio/mdev/mdev_private.h @@ -34,6 +34,7 @@ struct mdev_device { struct list_head next; struct kobject *type_kobj; bool active; + int domain_type; }; #define to_mdev_device(dev) container_of(dev, struct mdev_device, dev) diff --git a/include/linux/mdev.h b/include/linux/mdev.h index b6e048e..5d862b0 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -15,6 +15,28 @@ struct mdev_device; +enum mdev_domain_type { + DOMAIN_TYPE_EXTERNAL, /* Use the external domain and all + * IOMMU staff controlled by the + * parent device driver. + */ + DOMAIN_TYPE_INHERITANCE,/* Use the same domain as the parent device. */ + DOMAIN_TYPE_PRIVATE, /* Capable of having a private domain. For an + * example, the parent device is able to bind + * a specific PASID for a mediated device and + * transferring data with the asigned PASID. + */ +}; + +/* + * Called by the parent device driver to set the domain type. + * By default, the domain type is set to DOMAIN_TYPE_EXTERNAL. + */ +int mdev_set_domain_type(struct device *dev, enum mdev_domain_type type); + +/* Check the domain type. */ +enum mdev_domain_type mdev_get_domain_type(struct device *dev); + /** * struct mdev_parent_ops - Structure to be registered for each parent device to * register the device to mdev module. -- 2.7.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
