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| author | Yi Liu <yi.l.liu@intel.com> | 2023-07-18 03:55:36 -0700 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2023-07-25 10:17:52 -0600 |
| commit | 86b0a96c2952fa07b782b37f6ec783ace63a01a6 (patch) | |
| tree | eec72297c54a71f2094af4277704f777b9639403 | |
| parent | eda175dfe2484c1e79afaee0f65eeebfb9f89a53 (diff) | |
| download | linux-stable-86b0a96c2952fa07b782b37f6ec783ace63a01a6.tar.gz linux-stable-86b0a96c2952fa07b782b37f6ec783ace63a01a6.tar.bz2 linux-stable-86b0a96c2952fa07b782b37f6ec783ace63a01a6.zip | |
iommufd: Add iommufd_ctx_has_group()
This adds the helper to check if any device within the given iommu_group
has been bound with the iommufd_ctx. This is helpful for the checking on
device ownership for the devices which have not been bound but cannot be
bound to any other iommufd_ctx as the iommu_group has been bound.
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20230718105542.4138-5-yi.l.liu@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
| -rw-r--r-- | drivers/iommu/iommufd/device.c | 30 | ||||
| -rw-r--r-- | include/linux/iommufd.h | 2 |
2 files changed, 32 insertions, 0 deletions
diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 29d05663d4d1..693c2155a5da 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -99,6 +99,36 @@ out_group_put: EXPORT_SYMBOL_NS_GPL(iommufd_device_bind, IOMMUFD); /** + * iommufd_ctx_has_group - True if any device within the group is bound + * to the ictx + * @ictx: iommufd file descriptor + * @group: Pointer to a physical iommu_group struct + * + * True if any device within the group has been bound to this ictx, ex. via + * iommufd_device_bind(), therefore implying ictx ownership of the group. + */ +bool iommufd_ctx_has_group(struct iommufd_ctx *ictx, struct iommu_group *group) +{ + struct iommufd_object *obj; + unsigned long index; + + if (!ictx || !group) + return false; + + xa_lock(&ictx->objects); + xa_for_each(&ictx->objects, index, obj) { + if (obj->type == IOMMUFD_OBJ_DEVICE && + container_of(obj, struct iommufd_device, obj)->group == group) { + xa_unlock(&ictx->objects); + return true; + } + } + xa_unlock(&ictx->objects); + return false; +} +EXPORT_SYMBOL_NS_GPL(iommufd_ctx_has_group, IOMMUFD); + +/** * iommufd_device_unbind - Undo iommufd_device_bind() * @idev: Device returned by iommufd_device_bind() * diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 1129a36a74c4..f241bafa03da 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -16,6 +16,7 @@ struct page; struct iommufd_ctx; struct iommufd_access; struct file; +struct iommu_group; struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, struct device *dev, u32 *id); @@ -50,6 +51,7 @@ void iommufd_ctx_get(struct iommufd_ctx *ictx); #if IS_ENABLED(CONFIG_IOMMUFD) struct iommufd_ctx *iommufd_ctx_from_file(struct file *file); void iommufd_ctx_put(struct iommufd_ctx *ictx); +bool iommufd_ctx_has_group(struct iommufd_ctx *ictx, struct iommu_group *group); int iommufd_access_pin_pages(struct iommufd_access *access, unsigned long iova, unsigned long length, struct page **out_pages, |