On Fri, Jan 24, 2025 at 04:30:36PM -0800, Nicolin Chen wrote:
> +int iommufd_viommu_report_event(struct iommufd_viommu *viommu,
> + enum iommu_veventq_type type, void *event_data,
> + size_t data_len)
> +{
> + struct iommufd_veventq *veventq;
> + struct iommufd_vevent *vevent;
> + int rc = 0;
> +
> + if (WARN_ON_ONCE(!data_len || !event_data))
> + return -EINVAL;
> +
> + down_read(&viommu->veventqs_rwsem);
> +
> + veventq = iommufd_viommu_find_veventq(viommu, type);
> + if (!veventq) {
> + rc = -EOPNOTSUPP;
> + goto out_unlock_veventqs;
> + }
> +
> + if (atomic_read(&veventq->num_events) == veventq->depth) {
> + vevent = &veventq->overflow;
> + goto out_set_header;
> + }
> +
> + vevent = kmalloc(struct_size(vevent, event_data, data_len), GFP_KERNEL);
> + if (!vevent) {
> + rc = -ENOMEM;
> + goto out_unlock_veventqs;
This should record an overflow too
Jason
