Introduce a new IOMMUFD_OBJ_VDEVICE to represent a physical device, i.e.
iommufd_device (idev) object, against an iommufd_viommu (vIOMMU) object in
the VM. This vDEVICE object (and its structure) holds all the information
and attributes in a VM, regarding the device related to the vIOMMU.
As an initial patch, add a per-vIOMMU virtual ID. This can be:
- Virtual StreamID on a nested ARM SMMUv3, an index to a Stream Table
- Virtual DeviceID on a nested AMD IOMMU, an index to a Device Table
- Virtual ID on a nested Intel VT-D IOMMU, an index to a Context Table
Potentially, this vDEVICE structure can hold some vData for Confidential
Compute Architecture (CCA).
Add a pair of vdevice_alloc and vdevice_free in struct iommufd_viommu_ops
to allow driver-level vDEVICE structure allocations.
Similar to iommufd_vdevice_alloc, add an iommufd_vdevice_alloc helper so
IOMMU drivers can allocate core-embedded style structures.
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
drivers/iommu/iommufd/iommufd_private.h | 1 +
include/linux/iommufd.h | 31 +++++++++++++++++++++++++
drivers/iommu/iommufd/viommu_api.c | 14 +++++++++++
3 files changed, 46 insertions(+)
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index c80d880f8b6a..0c56a467e440 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -132,6 +132,7 @@ enum iommufd_object_type {
IOMMUFD_OBJ_ACCESS,
IOMMUFD_OBJ_FAULT,
IOMMUFD_OBJ_VIOMMU,
+ IOMMUFD_OBJ_VDEVICE,
#ifdef CONFIG_IOMMUFD_TEST
IOMMUFD_OBJ_SELFTEST,
#endif
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 069a38999cdd..510fc961a9ad 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -75,13 +75,30 @@ struct iommufd_viommu {
unsigned int type;
};
+struct iommufd_vdevice {
+ struct iommufd_object obj;
+ struct iommufd_ctx *ictx;
+ struct iommufd_device *idev;
+ struct iommufd_viommu *viommu;
+ u64 id; /* per-vIOMMU virtual ID */
+};
+
/**
* struct iommufd_viommu_ops - vIOMMU specific operations
* @free: Free all driver-specific parts of an iommufd_viommu. The memory of the
* vIOMMU will be free-ed by iommufd core after calling this free op.
+ * @vdevice_alloc: Allocate a driver-managed iommufd_vdevice to init some driver
+ * specific structure or HW procedure. Note that the core-level
+ * structure is filled by the iommufd core after calling this op.
+ * @vdevice_free: Free a driver-managed iommufd_vdevice to de-init its structure
+ * or HW procedure. The memory of the vdevice will be free-ed by
+ * iommufd core.
*/
struct iommufd_viommu_ops {
void (*free)(struct iommufd_viommu *viommu);
+ struct iommufd_vdevice *(*vdevice_alloc)(struct iommufd_viommu *viommu,
+ struct device *dev, u64 id);
+ void (*vdevice_free)(struct iommufd_vdevice *vdev);
};
#if IS_ENABLED(CONFIG_IOMMUFD)
@@ -103,6 +120,8 @@ int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx);
struct iommufd_viommu *
__iommufd_viommu_alloc(struct iommufd_ctx *ictx, size_t size,
const struct iommufd_viommu_ops *ops);
+struct iommufd_vdevice *
+__iommufd_vdevice_alloc(struct iommufd_ctx *ictx, size_t size);
#else /* !CONFIG_IOMMUFD */
static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file)
{
@@ -150,6 +169,12 @@ __iommufd_viommu_alloc(struct iommufd_ctx *ictx, size_t size,
{
return ERR_PTR(-EOPNOTSUPP);
}
+
+static inline struct iommufd_vdevice *
+__iommufd_vdevice_alloc(struct iommufd_ctx *ictx, size_t size)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
#endif /* CONFIG_IOMMUFD */
/*
@@ -163,4 +188,10 @@ __iommufd_viommu_alloc(struct iommufd_ctx *ictx, size_t size,
struct drv_struct, member)), \
ops), \
struct drv_struct, member)
+#define iommufd_vdevice_alloc(ictx, drv_struct, member) \
+ container_of(__iommufd_vdevice_alloc(ictx, \
+ sizeof(struct drv_struct) + \
+ BUILD_BUG_ON_ZERO(offsetof( \
+ struct drv_struct, member))), \
+ struct drv_struct, member)
#endif
diff --git a/drivers/iommu/iommufd/viommu_api.c b/drivers/iommu/iommufd/viommu_api.c
index c1731f080d6b..8419df3b658c 100644
--- a/drivers/iommu/iommufd/viommu_api.c
+++ b/drivers/iommu/iommufd/viommu_api.c
@@ -55,3 +55,17 @@ __iommufd_viommu_alloc(struct iommufd_ctx *ictx, size_t size,
return viommu;
}
EXPORT_SYMBOL_NS_GPL(__iommufd_viommu_alloc, IOMMUFD);
+
+struct iommufd_vdevice *
+__iommufd_vdevice_alloc(struct iommufd_ctx *ictx, size_t size)
+{
+ struct iommufd_object *obj;
+
+ if (WARN_ON(size < sizeof(struct iommufd_vdevice)))
+ return ERR_PTR(-EINVAL);
+ obj = iommufd_object_alloc_elm(ictx, size, IOMMUFD_OBJ_VDEVICE);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+ return container_of(obj, struct iommufd_vdevice, obj);
+}
+EXPORT_SYMBOL_NS_GPL(__iommufd_vdevice_alloc, IOMMUFD);
--
2.43.0
