domain_alloc_user op already accepts user flags for domain allocation, add a parent domain pointer and a driver specific user data support as well.
Add a struct iommu_user_data as a bundle of data_ptr/data_len/type from an iommufd core uAPI structure. Make the user data opaque to the core, since a userspace driver must match the kernel driver. In the future, if drivers share some common parameter, there would be a generic parameter as well.
Define an enum iommu_hwpt_data_type (with IOMMU_HWPT_DATA_NONE type) for iommu drivers to add their own driver specific user data per hw_pagetable.
Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Co-developed-by: Nicolin Chen nicolinc@nvidia.com Signed-off-by: Nicolin Chen nicolinc@nvidia.com Signed-off-by: Yi Liu yi.l.liu@intel.com --- drivers/iommu/intel/iommu.c | 4 +++- drivers/iommu/iommufd/hw_pagetable.c | 3 ++- drivers/iommu/iommufd/selftest.c | 4 +++- include/linux/iommu.h | 27 ++++++++++++++++++++++++--- include/uapi/linux/iommufd.h | 8 ++++++++ 5 files changed, 40 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 017aed5813d8..8d78149e793e 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4075,7 +4075,9 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type) }
static struct iommu_domain * -intel_iommu_domain_alloc_user(struct device *dev, u32 flags) +intel_iommu_domain_alloc_user(struct device *dev, u32 flags, + struct iommu_domain *parent, + const struct iommu_user_data *user_data) { struct iommu_domain *domain; struct intel_iommu *iommu; diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index 8b3d2875d642..548079c8ca0a 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -96,7 +96,8 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, hwpt->ioas = ioas;
if (ops->domain_alloc_user) { - hwpt->domain = ops->domain_alloc_user(idev->dev, flags); + hwpt->domain = ops->domain_alloc_user(idev->dev, flags, + NULL, NULL); if (IS_ERR(hwpt->domain)) { rc = PTR_ERR(hwpt->domain); hwpt->domain = NULL; diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index fe7e3c7d933a..2bfe8dc9adc3 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -171,7 +171,9 @@ static struct iommu_domain *mock_domain_alloc(unsigned int iommu_domain_type) }
static struct iommu_domain * -mock_domain_alloc_user(struct device *dev, u32 flags) +mock_domain_alloc_user(struct device *dev, u32 flags, + struct iommu_domain *parent, + const struct iommu_user_data *user_data) { struct iommu_domain *domain;
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index ce08a3c41446..cdb989b853a5 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -231,6 +231,21 @@ struct iommu_iotlb_gather { bool queued; };
+/** + * struct iommu_user_data - iommu driver specific user space data info + * @type: The data type of the user buffer + * @uptr: Pointer to the user buffer for copy_from_user() + * @len: The length of the user buffer in bytes + * + * A user space data is an uAPI that is defined in include/uapi/linux/iommufd.h + * @type, @uptr and @len should be just copied from an iommufd core uAPI struct. + */ +struct iommu_user_data { + unsigned int type; + void __user *uptr; + size_t len; +}; + /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability @@ -245,8 +260,12 @@ struct iommu_iotlb_gather { * parameters as defined in include/uapi/linux/iommufd.h. * Unlike @domain_alloc, it is called only by IOMMUFD and * must fully initialize the new domain before return. - * Upon success, a domain is returned. Upon failure, - * ERR_PTR must be returned. + * Upon success, if the @user_data is valid and the @parent + * points to a kernel-managed domain, the new domain must be + * IOMMU_DOMAIN_NESTED type; otherwise, the @parent must be + * NULL while the @user_data can be optionally provided, the + * new domain must support __IOMMU_DOMAIN_PAGING. + * Upon failure, ERR_PTR must be returned. * @probe_device: Add device to iommu driver handling * @release_device: Remove device from iommu driver handling * @probe_finalize: Do final setup work after the device is added to an IOMMU @@ -279,7 +298,9 @@ struct iommu_ops {
/* Domain allocation and freeing by the iommu driver */ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); - struct iommu_domain *(*domain_alloc_user)(struct device *dev, u32 flags); + struct iommu_domain *(*domain_alloc_user)(struct device *dev, u32 flags, + struct iommu_domain *parent, + const struct iommu_user_data *user_data);
struct iommu_device *(*probe_device)(struct device *dev); void (*release_device)(struct device *dev); diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index be7a95042677..b459bb7ac579 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -356,6 +356,14 @@ enum iommufd_hwpt_alloc_flags { IOMMU_HWPT_ALLOC_NEST_PARENT = 1 << 0, };
+/** + * enum iommu_hwpt_data_type - IOMMU HWPT Data Type + * @IOMMU_HWPT_DATA_NONE: no data + */ +enum iommu_hwpt_data_type { + IOMMU_HWPT_DATA_NONE, +}; + /** * struct iommu_hwpt_alloc - ioctl(IOMMU_HWPT_ALLOC) * @size: sizeof(struct iommu_hwpt_alloc)