[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [XEN][PATCH v7 11/19] xen/iommu: Introduce iommu_remove_dt_device()
Remove master device from the IOMMU. This will be helpful when removing the overlay nodes using dynamic programming during run time. Signed-off-by: Vikram Garhwal <vikram.garhwal@xxxxxxx> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx> Acked-by: Jan Beulich <jbeulich@xxxxxxxx> --- xen/drivers/passthrough/device_tree.c | 41 +++++++++++++++++++++++++++ xen/include/xen/iommu.h | 2 ++ 2 files changed, 43 insertions(+) diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthrough/device_tree.c index 8cc413f867..301a5bcd97 100644 --- a/xen/drivers/passthrough/device_tree.c +++ b/xen/drivers/passthrough/device_tree.c @@ -126,6 +126,47 @@ int iommu_release_dt_devices(struct domain *d) return 0; } +int iommu_remove_dt_device(struct dt_device_node *np) +{ + const struct iommu_ops *ops = iommu_get_ops(); + struct device *dev = dt_to_dev(np); + int rc; + + if ( !ops ) + return -EOPNOTSUPP; + + spin_lock(&dtdevs_lock); + + if ( iommu_dt_device_is_assigned_locked(np) ) + { + rc = -EBUSY; + goto fail; + } + + /* + * The driver which supports generic IOMMU DT bindings must have this + * callback implemented. + */ + if ( !ops->remove_device ) + { + rc = -EOPNOTSUPP; + goto fail; + } + + /* + * Remove master device from the IOMMU if latter is present and available. + * The driver is responsible for removing is_protected flag. + */ + rc = ops->remove_device(0, dev); + + if ( !rc ) + iommu_fwspec_free(dev); + +fail: + spin_unlock(&dtdevs_lock); + return rc; +} + int iommu_add_dt_device(struct dt_device_node *np) { const struct iommu_ops *ops = iommu_get_ops(); diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h index 405db59971..0d7924821b 100644 --- a/xen/include/xen/iommu.h +++ b/xen/include/xen/iommu.h @@ -229,6 +229,8 @@ int iommu_release_dt_devices(struct domain *d); */ int iommu_add_dt_device(struct dt_device_node *np); +int iommu_remove_dt_device(struct dt_device_node *np); + int iommu_do_dt_domctl(struct xen_domctl *, struct domain *, XEN_GUEST_HANDLE_PARAM(xen_domctl_t)); -- 2.17.1
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