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iommu/viommu: Add cache_invalidate to iommufd_viommu_ops

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This per-vIOMMU cache_invalidate op is like the cache_invalidate_user op
in struct iommu_domain_ops, but wider, supporting device cache (e.g. PCI
ATC invaldiations).

Link: https://patch.msgid.link/r/90138505850fa6b165135e78a87b4cc7022869a4.1730836308.git.nicolinc@nvidia.com
Reviewed-by: Jason Gunthorpe <jgg@nvidia.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
2024-11-05 12:05:11 -08:00
committed by Jason Gunthorpe
parent 5778c75703
commit 67db79dc1a
1 changed files with 10 additions and 0 deletions
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10
include/linux/iommufd.h
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@@ -16,6 +16,7 @@ struct device;
struct file;
struct iommu_group;
struct iommu_user_data;
struct iommu_user_data_array;
struct iommufd_access;
struct iommufd_ctx;
struct iommufd_device;
@@ -105,12 +106,21 @@ struct iommufd_viommu {
* must be defined in include/uapi/linux/iommufd.h.
* It must fully initialize the new iommu_domain before
* returning. Upon failure, ERR_PTR must be returned.
* @cache_invalidate: Flush hardware cache used by a vIOMMU. It can be used for
* any IOMMU hardware specific cache: TLB and device cache.
* The @array passes in the cache invalidation requests, in
* form of a driver data structure. A driver must update the
* array->entry_num to report the number of handled requests.
* The data structure of the array entry must be defined in
* include/uapi/linux/iommufd.h
*/
struct iommufd_viommu_ops {
void (*destroy)(struct iommufd_viommu *viommu);
struct iommu_domain *(*alloc_domain_nested)(
struct iommufd_viommu *viommu, u32 flags,
const struct iommu_user_data *user_data);
int (*cache_invalidate)(struct iommufd_viommu *viommu,
struct iommu_user_data_array *array);
};
#if IS_ENABLED(CONFIG_IOMMUFD)