On Fri, Apr 23, 2021 at 03:21:38PM +0530, Vivek Gautam wrote:
> Keeping a record of list of endpoints that are served by the virtio-iommu
> device would help in redirecting the requests of page faults to the
> correct endpoint device to handle such requests.
>
> Signed-off-by: Vivek Gautam <vivek.gautam@xxxxxxx>
> ---
> drivers/iommu/virtio-iommu.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 50039070e2aa..c970f386f031 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -48,6 +48,7 @@ struct viommu_dev {
> spinlock_t request_lock;
> struct list_head requests;
> void *evts;
> + struct list_head endpoints;
As we're going to search by ID, an xarray or rb_tree would be more
appropriate than a list
>
> /* Device configuration */
> struct iommu_domain_geometry geometry;
> @@ -115,6 +116,12 @@ struct viommu_endpoint {
> void *pgtf;
> };
>
> +struct viommu_ep_entry {
> + u32 eid;
> + struct viommu_endpoint *vdev;
> + struct list_head list;
> +};
No need for a separate struct, I think you can just add the list head and
id into viommu_endpoint.
> +
> struct viommu_request {
> struct list_head list;
> void *writeback;
> @@ -573,6 +580,7 @@ static int viommu_probe_endpoint(struct viommu_dev *viommu, struct device *dev)
> size_t probe_len;
> struct virtio_iommu_req_probe *probe;
> struct virtio_iommu_probe_property *prop;
> + struct viommu_ep_entry *ep;
> struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
> struct viommu_endpoint *vdev = dev_iommu_priv_get(dev);
>
> @@ -640,6 +648,18 @@ static int viommu_probe_endpoint(struct viommu_dev *viommu, struct device *dev)
> prop = (void *)probe->properties + cur;
> type = le16_to_cpu(prop->type) & VIRTIO_IOMMU_PROBE_T_MASK;
> }
> + if (ret)
> + goto out_free;
> +
> + ep = kzalloc(sizeof(*ep), GFP_KERNEL);
> + if (!ep) {
> + ret = -ENOMEM;
> + goto out_free;
> + }
> + ep->eid = probe->endpoint;
> + ep->vdev = vdev;
> +
> + list_add(&ep->list, &viommu->endpoints);
This should be in viommu_probe_device() (viommu_probe_endpoint() is only
called if F_PROBE is negotiated). I think we need a lock for this
list/xarray
Thanks,
Jean
>
> out_free:
> kfree(probe);
> @@ -1649,6 +1669,7 @@ static int viommu_probe(struct virtio_device *vdev)
> viommu->dev = dev;
> viommu->vdev = vdev;
> INIT_LIST_HEAD(&viommu->requests);
> + INIT_LIST_HEAD(&viommu->endpoints);
>
> ret = viommu_init_vqs(viommu);
> if (ret)
> --
> 2.17.1
>
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