From 70c16123d865046899c36e3655b2d611f38f51a3 Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Thu, 27 Jul 2023 23:33:27 -0700 Subject: iommufd: Add iommufd_access_replace() API Taking advantage of the new iommufd_access_change_ioas_id helper, add an iommufd_access_replace() API for the VFIO emulated pathway to use. Link: https://lore.kernel.org/r/a3267b924fd5f45e0d3a1dd13a9237e923563862.1690523699.git.nicolinc@nvidia.com Suggested-by: Jason Gunthorpe Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen Reviewed-by: Jason Gunthorpe Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommufd/device.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'drivers/iommu') diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index c0b9cd97ec58..4c37eeea2bcd 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -849,6 +849,21 @@ int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id) } EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD); +int iommufd_access_replace(struct iommufd_access *access, u32 ioas_id) +{ + int rc; + + mutex_lock(&access->ioas_lock); + if (!access->ioas) { + mutex_unlock(&access->ioas_lock); + return -ENOENT; + } + rc = iommufd_access_change_ioas_id(access, ioas_id); + mutex_unlock(&access->ioas_lock); + return rc; +} +EXPORT_SYMBOL_NS_GPL(iommufd_access_replace, IOMMUFD); + /** * iommufd_access_notify_unmap - Notify users of an iopt to stop using it * @iopt: iopt to work on -- cgit v1.2.3