Re: [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2025-02-18 15:35:47
Also in:
linux-arm-kernel, linux-iommu, linux-kselftest, linux-patches, lkml
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