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iommu: Add iommu_copy_struct_to_user helper

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Similar to the iommu_copy_struct_from_user helper receiving data from the
user space, add an iommu_copy_struct_to_user helper to report output data
back to the user space data pointer.

Link: https://patch.msgid.link/r/fa292c2a730aadd77085ec3a8272360c96eabb9c.1752126748.git.nicolinc@nvidia.com
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2025-07-09 22:58:57 -07:00 committed by Jason Gunthorpe
parent 4b57c057f9
commit 3fcf56a239
1 changed files with 40 additions and 0 deletions
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40
include/linux/iommu.h
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@ -558,6 +558,46 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size,
return 0;
}
/**
* __iommu_copy_struct_to_user - Report iommu driver specific user space data
* @dst_data: Pointer to a struct iommu_user_data for user space data location
* @src_data: Pointer to an iommu driver specific user data that is defined in
* include/uapi/linux/iommufd.h
* @data_type: The data type of the @src_data. Must match with @dst_data.type
* @data_len: Length of current user data structure, i.e. sizeof(struct _src)
* @min_len: Initial length of user data structure for backward compatibility.
* This should be offsetofend using the last member in the user data
* struct that was initially added to include/uapi/linux/iommufd.h
*/
static inline int
__iommu_copy_struct_to_user(const struct iommu_user_data *dst_data,
void *src_data, unsigned int data_type,
size_t data_len, size_t min_len)
{
if (WARN_ON(!dst_data || !src_data))
return -EINVAL;
if (dst_data->type != data_type)
return -EINVAL;
if (dst_data->len < min_len || data_len < dst_data->len)
return -EINVAL;
return copy_struct_to_user(dst_data->uptr, dst_data->len, src_data,
data_len, NULL);
}
/**
* iommu_copy_struct_to_user - Report iommu driver specific user space data
* @user_data: Pointer to a struct iommu_user_data for user space data location
* @ksrc: Pointer to an iommu driver specific user data that is defined in
* include/uapi/linux/iommufd.h
* @data_type: The data type of the @ksrc. Must match with @user_data->type
* @min_last: The last member of the data structure @ksrc points in the initial
* version.
* Return 0 for success, otherwise -error.
*/
#define iommu_copy_struct_to_user(user_data, ksrc, data_type, min_last) \
__iommu_copy_struct_to_user(user_data, ksrc, data_type, sizeof(*ksrc), \
offsetofend(typeof(*ksrc), min_last))
/**
* struct iommu_ops - iommu ops and capabilities
* @capable: check capability