linux-kernel - [PATCH v4 04/17] iommufd: Pass in hwpt_type/user_data to iommufd_hw_pagetable

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Date:   Thu, 21 Sep 2023 00:51:25 -0700
From:   Yi Liu <yi.l.liu@...el.com>
To:     joro@...tes.org, alex.williamson@...hat.com, jgg@...dia.com,
        kevin.tian@...el.com, robin.murphy@....com,
        baolu.lu@...ux.intel.com
Cc:     cohuck@...hat.com, eric.auger@...hat.com, nicolinc@...dia.com,
        kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
        chao.p.peng@...ux.intel.com, yi.l.liu@...el.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        zhenzhong.duan@...el.com, joao.m.martins@...cle.com
Subject: [PATCH v4 04/17] iommufd: Pass in hwpt_type/user_data to iommufd_hw_pagetable_alloc()

iommu core already supports accepting user_data and hwpt_type to allocate
a user iommu_domain, which allows the caller iommufd_hw_pagetable_alloc()
to accept the hwpt_type and user_data too. Thus, pass them in.

Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Co-developed-by: Nicolin Chen <nicolinc@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
---
 drivers/iommu/iommufd/device.c          |  3 ++-
 drivers/iommu/iommufd/hw_pagetable.c    | 17 ++++++++++++++---
 drivers/iommu/iommufd/iommufd_private.h |  3 +++
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index e88fa73a45e6..e04900f101f1 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -540,7 +540,8 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev,
 	}
 
 	hwpt = iommufd_hw_pagetable_alloc(idev->ictx, ioas, idev,
-					  0, immediate_attach);
+					  0, IOMMU_HWPT_TYPE_DEFAULT,
+					  NULL, immediate_attach);
 	if (IS_ERR(hwpt)) {
 		destroy_hwpt = ERR_CAST(hwpt);
 		goto out_unlock;
diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c
index 1d7378a6cbb3..554a9c3d740f 100644
--- a/drivers/iommu/iommufd/hw_pagetable.c
+++ b/drivers/iommu/iommufd/hw_pagetable.c
@@ -62,6 +62,8 @@ int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt)
  * @ioas: IOAS to associate the domain with
  * @idev: Device to get an iommu_domain for
  * @flags: Flags from userspace
+ * @hwpt_type: Requested type of hw_pagetable
+ * @user_data: Optional user_data pointer
  * @immediate_attach: True if idev should be attached to the hwpt
  *
  * Allocate a new iommu_domain and return it as a hw_pagetable. The HWPT
@@ -75,6 +77,8 @@ int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt)
 struct iommufd_hw_pagetable *
 iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 			   struct iommufd_device *idev, u32 flags,
+			   enum iommu_hwpt_type hwpt_type,
+			   struct iommu_user_data *user_data,
 			   bool immediate_attach)
 {
 	const struct iommu_ops *ops = dev_iommu_ops(idev->dev);
@@ -86,6 +90,11 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 	if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ops->domain_alloc_user)
 		return ERR_PTR(-EOPNOTSUPP);
 
+	if (user_data && hwpt_type == IOMMU_HWPT_TYPE_DEFAULT)
+		return ERR_PTR(-EINVAL);
+	if (user_data && !ops->domain_alloc_user)
+		return ERR_PTR(-EOPNOTSUPP);
+
 	hwpt = iommufd_object_alloc(ictx, hwpt, IOMMUFD_OBJ_HW_PAGETABLE);
 	if (IS_ERR(hwpt))
 		return hwpt;
@@ -97,8 +106,8 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 
 	if (ops->domain_alloc_user) {
 		hwpt->domain = ops->domain_alloc_user(idev->dev, flags,
-						      IOMMU_HWPT_TYPE_DEFAULT,
-						      NULL, NULL);
+						      hwpt_type, NULL,
+						      user_data);
 		if (IS_ERR(hwpt->domain)) {
 			rc = PTR_ERR(hwpt->domain);
 			hwpt->domain = NULL;
@@ -174,7 +183,9 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd)
 
 	mutex_lock(&ioas->mutex);
 	hwpt = iommufd_hw_pagetable_alloc(ucmd->ictx, ioas,
-					  idev, cmd->flags, false);
+					  idev, cmd->flags,
+					  IOMMU_HWPT_TYPE_DEFAULT,
+					  NULL, false);
 	if (IS_ERR(hwpt)) {
 		rc = PTR_ERR(hwpt);
 		goto out_unlock;
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index 947a797536e3..1d3b1a74e854 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -13,6 +13,7 @@ struct iommu_domain;
 struct iommu_group;
 struct iommu_option;
 struct iommufd_device;
+struct iommu_user_data;
 
 struct iommufd_ctx {
 	struct file *file;
@@ -248,6 +249,8 @@ struct iommufd_hw_pagetable {
 struct iommufd_hw_pagetable *
 iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
 			   struct iommufd_device *idev, u32 flags,
+			   enum iommu_hwpt_type hwpt_type,
+			   struct iommu_user_data *user_data,
 			   bool immediate_attach);
 int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt);
 int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
-- 
2.34.1