On 2021/9/27 17:42, Tian, Kevin wrote:
+int iommu_device_set_dma_hint(struct device *dev, enum dma_hint hint)
+{
+ struct iommu_group *group;
+ int ret;
+
+ group = iommu_group_get(dev);
+ /* not an iommu-probed device */
+ if (!group)
+ return 0;
+
+ mutex_lock(&group->mutex);
+ ret = __iommu_group_viable(group, hint);
+ mutex_unlock(&group->mutex);
+
+ iommu_group_put(group);
+ return ret;
+}
Conceptually, we could also move iommu_deferred_attach() from
iommu_dma_ops here to save unnecessary checks in the hot DMA API
paths?
Best regards,
baolu
