On Wed, Oct 09, 2024 at 09:38:03AM -0700, Nicolin Chen wrote:
> + struct iommufd_viommu *(*viommu_alloc)(struct iommu_device *iommu_dev,
> + struct iommu_domain *domain,
Let's call this parent_domain ie nesting parent
> +/*
> + * Helpers for IOMMU driver to allocate driver structures that will be freed
> by
> + * the iommufd core. Yet, a driver is responsible for its own
> struct cleanup.
'own struct cleanup via the free callback'
> diff --git a/drivers/iommu/iommufd/viommu_api.c
> b/drivers/iommu/iommufd/viommu_api.c
> new file mode 100644
> index 000000000000..c1731f080d6b
> --- /dev/null
> +++ b/drivers/iommu/iommufd/viommu_api.c
Let's call this file driver.c to match CONFIG_IOMMUFD_DRIVER
> +struct iommufd_viommu *
> +__iommufd_viommu_alloc(struct iommufd_ctx *ictx, size_t size,
> + const struct iommufd_viommu_ops *ops)
> +{
> + struct iommufd_viommu *viommu;
> + struct iommufd_object *obj;
> +
> + if (WARN_ON(size < sizeof(*viommu)))
> + return ERR_PTR(-EINVAL);
The macro does this already
> + obj = iommufd_object_alloc_elm(ictx, size, IOMMUFD_OBJ_VIOMMU);
> + if (IS_ERR(obj))
> + return ERR_CAST(obj);
> + viommu = container_of(obj, struct iommufd_viommu, obj);
And this too..
> + if (ops)
> + viommu->ops = ops;
No need for an if...
It could just be in the macro which is a bit appealing given we want
this linked into the drivers..
/*
* Helpers for IOMMU driver to allocate driver structures that will be freed by
* the iommufd core. The free op will be called prior to freeing the memory.
*/
#define iommufd_viommu_alloc(ictx, drv_struct, member, viommu_ops) \
({ \
struct drv_struct *ret; \
\
static_assert( \
__same_type(struct iommufd_viommu, \
((struct drv_struct *)NULL)->member)); \
static_assert(offsetof(struct drv_struct, member.obj) == 0); \
ret = (struct drv_struct *)iommufd_object_alloc_elm( \
ictx, sizeof(struct drv_struct), IOMMUFD_OBJ_VIOMMU); \
ret->member.ops = viommu_ops; \
ret; \
})
Jason
