[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <384f7b4333a1f75da09e390902b8f82be21a0dd3.1729897278.git.nicolinc@nvidia.com>
Date: Fri, 25 Oct 2024 16:50:36 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
<zhangfei.gao@...aro.org>, <patches@...ts.linux.dev>
Subject: [PATCH v5 07/13] iommufd/viommu: Add iommufd_viommu_find_dev helper
This avoids a bigger trouble of exposing struct iommufd_device and struct
iommufd_vdevice in the public header.
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
include/linux/iommufd.h | 8 ++++++++
drivers/iommu/iommufd/driver.c | 13 +++++++++++++
2 files changed, 21 insertions(+)
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 0287a6d00192..dc174d02132b 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -184,6 +184,8 @@ static inline int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx)
struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
size_t size,
enum iommufd_object_type type);
+struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
+ unsigned long vdev_id);
#else /* !CONFIG_IOMMUFD_DRIVER */
static inline struct iommufd_object *
_iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
@@ -191,6 +193,12 @@ _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
{
return ERR_PTR(-EOPNOTSUPP);
}
+
+static inline struct device *
+iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id)
+{
+ return NULL;
+}
#endif /* CONFIG_IOMMUFD_DRIVER */
/*
diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c
index c0876d3f91c7..3604443f82a1 100644
--- a/drivers/iommu/iommufd/driver.c
+++ b/drivers/iommu/iommufd/driver.c
@@ -36,3 +36,16 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
return ERR_PTR(rc);
}
EXPORT_SYMBOL_NS_GPL(_iommufd_object_alloc, IOMMUFD);
+
+/* Caller should xa_lock(&viommu->vdevs) to protect the return value */
+struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
+ unsigned long vdev_id)
+{
+ struct iommufd_vdevice *vdev;
+
+ lockdep_is_held(&viommu->vdevs.xa_lock);
+
+ vdev = xa_load(&viommu->vdevs, vdev_id);
+ return vdev ? vdev->idev->dev : NULL;
+}
+EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, IOMMUFD);
--
2.43.0
Powered by blists - more mailing lists