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Message-ID: <fa5231cad2bf4b3ee9a18434a8981acb45f0e0b5.1729897352.git.nicolinc@nvidia.com>
Date: Fri, 25 Oct 2024 16:49:45 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
<zhangfei.gao@...aro.org>, <patches@...ts.linux.dev>
Subject: [PATCH v5 05/13] iommufd: Add alloc_domain_nested op to iommufd_viommu_ops
Allow IOMMU driver to use a vIOMMU object that holds a nesting parent
hwpt/domain to allocate a nested domain.
Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
include/linux/iommufd.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 4435f21bd833..083ceb209704 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -14,6 +14,7 @@
struct device;
struct file;
struct iommu_group;
+struct iommu_user_data;
struct iommufd_access;
struct iommufd_ctx;
struct iommufd_device;
@@ -95,9 +96,17 @@ struct iommufd_viommu {
* struct iommufd_viommu_ops - vIOMMU specific operations
* @free: Free all driver-specific parts of an iommufd_viommu. The memory of the
* vIOMMU will be free-ed by iommufd core after calling this free op.
+ * @alloc_domain_nested: Allocate a IOMMU_DOMAIN_NESTED on a vIOMMU that holds a
+ * nesting parent domain (IOMMU_DOMAIN_PAGING). @user_data
+ * 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.
*/
struct iommufd_viommu_ops {
void (*free)(struct iommufd_viommu *viommu);
+ struct iommu_domain *(*alloc_domain_nested)(
+ struct iommufd_viommu *viommu,
+ const struct iommu_user_data *user_data);
};
#if IS_ENABLED(CONFIG_IOMMUFD)
--
2.43.0
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