[PATCH v4 08/14] iommufd/viommu: Add iommufd_viommu_report_event helper
From: Nicolin Chen <hidden>
Date: 2025-01-03 19:44:48
Also in:
linux-doc, linux-iommu, linux-kselftest, linux-patches, lkml
Subsystem:
iommu subsystem, iommufd, the rest · Maintainers:
Joerg Roedel, Will Deacon, Jason Gunthorpe, Kevin Tian, Linus Torvalds
Similar to iommu_report_device_fault, this allows IOMMU drivers to report vIOMMU events from threaded IRQ handlers to user space hypervisors. Signed-off-by: Nicolin Chen <redacted> --- include/linux/iommufd.h | 11 ++++++++++ drivers/iommu/iommufd/driver.c | 40 ++++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+)
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 9c6ba7df3994..6b3b46e382f8 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h@@ -11,6 +11,7 @@ #include <linux/refcount.h> #include <linux/types.h> #include <linux/xarray.h> +#include <uapi/linux/iommufd.h> struct device; struct file;
@@ -192,6 +193,9 @@ struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id); unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, struct device *dev); +int iommufd_viommu_report_event(struct iommufd_viommu *viommu, + enum iommu_veventq_type type, void *event_data, + size_t data_len); #else /* !CONFIG_IOMMUFD_DRIVER_CORE */ static inline struct iommufd_object * _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
@@ -211,6 +215,13 @@ iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, struct device *dev) { return 0; } + +static inline int iommufd_viommu_report_event(struct iommufd_viommu *viommu, + enum iommu_veventq_type type, + void *event_data, size_t data_len) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_IOMMUFD_DRIVER_CORE */ /*
diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c
index e5d7397c0a6c..77c34f8791ef 100644
--- a/drivers/iommu/iommufd/driver.c
+++ b/drivers/iommu/iommufd/driver.c@@ -69,5 +69,45 @@ unsigned long iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu, } EXPORT_SYMBOL_NS_GPL(iommufd_viommu_get_vdev_id, "IOMMUFD"); +/* + * Typically called in driver's threaded IRQ handler. + * The @type and @event_data must be defined in include/uapi/linux/iommufd.h + */ +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 (!viommu) + return -ENODEV; + 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; + } + + vevent = kmalloc(struct_size(vevent, event_data, data_len), GFP_KERNEL); + if (!vevent) { + rc = -ENOMEM; + goto out_unlock_veventqs; + } + memcpy(vevent->event_data, event_data, data_len); + vevent->data_len = data_len; + + iommufd_vevent_handler(veventq, vevent); +out_unlock_veventqs: + up_read(&viommu->veventqs_rwsem); + return rc; +} +EXPORT_SYMBOL_NS_GPL(iommufd_viommu_report_event, "IOMMUFD"); + MODULE_DESCRIPTION("iommufd code shared with builtin modules"); MODULE_LICENSE("GPL");
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2.43.0