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Message-Id: <20231020091946.12173-5-yi.l.liu@intel.com>
Date: Fri, 20 Oct 2023 02:19:40 -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,
xin.zeng@...el.com
Subject: [PATCH v5 04/10] iommufd/device: Wrap IOMMUFD_OBJ_HWPT_PAGING-only configurations
From: Jason Gunthorpe <jgg@...dia.com>
Some of the configurations during the attach/replace() should only apply
to IOMMUFD_OBJ_HWPT_PAGING. Once IOMMUFD_OBJ_HWPT_NESTED gets introduced
in a following patch, keeping them unconditionally in the common routine
will not work.
Wrap all of those PAGING-only configurations together into helpers. Do a
hwpt_is_paging check whenever calling them or their fallback routines.
Also, move "num_devices++" closer to the place using it.
Signed-off-by: Jason Gunthorpe <jgg@...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 | 137 ++++++++++++++++--------
drivers/iommu/iommufd/iommufd_private.h | 5 +
2 files changed, 99 insertions(+), 43 deletions(-)
diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index a5f9f20b2a9b..3414276bbd15 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -325,6 +325,35 @@ static int iommufd_group_setup_msi(struct iommufd_group *igroup,
return 0;
}
+static int iommufd_hwpt_paging_attach(struct iommufd_hw_pagetable *hwpt,
+ struct iommufd_device *idev)
+{
+ int rc;
+
+ lockdep_assert_held(&idev->igroup->lock);
+
+ /* Try to upgrade the domain we have */
+ if (idev->enforce_cache_coherency) {
+ rc = iommufd_hw_pagetable_enforce_cc(hwpt);
+ if (rc)
+ return rc;
+ }
+
+ rc = iopt_table_enforce_dev_resv_regions(&hwpt->ioas->iopt, idev->dev,
+ &idev->igroup->sw_msi_start);
+ if (rc)
+ return rc;
+
+ if (list_empty(&idev->igroup->device_list)) {
+ rc = iommufd_group_setup_msi(idev->igroup, hwpt);
+ if (rc) {
+ iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev);
+ return rc;
+ }
+ }
+ return 0;
+}
+
int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
struct iommufd_device *idev)
{
@@ -337,18 +366,12 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
goto err_unlock;
}
- /* Try to upgrade the domain we have */
- if (idev->enforce_cache_coherency) {
- rc = iommufd_hw_pagetable_enforce_cc(hwpt);
+ if (hwpt_is_paging(hwpt)) {
+ rc = iommufd_hwpt_paging_attach(hwpt, idev);
if (rc)
goto err_unlock;
}
- rc = iopt_table_enforce_dev_resv_regions(&hwpt->ioas->iopt, idev->dev,
- &idev->igroup->sw_msi_start);
- if (rc)
- goto err_unlock;
-
/*
* Only attach to the group once for the first device that is in the
* group. All the other devices will follow this attachment. The user
@@ -357,10 +380,6 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
* attachment.
*/
if (list_empty(&idev->igroup->device_list)) {
- rc = iommufd_group_setup_msi(idev->igroup, hwpt);
- if (rc)
- goto err_unresv;
-
rc = iommu_attach_group(hwpt->domain, idev->igroup->group);
if (rc)
goto err_unresv;
@@ -371,7 +390,8 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
mutex_unlock(&idev->igroup->lock);
return 0;
err_unresv:
- iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev);
+ if (hwpt_is_paging(hwpt))
+ iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev);
err_unlock:
mutex_unlock(&idev->igroup->lock);
return rc;
@@ -388,7 +408,8 @@ iommufd_hw_pagetable_detach(struct iommufd_device *idev)
iommu_detach_group(hwpt->domain, idev->igroup->group);
idev->igroup->hwpt = NULL;
}
- iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev);
+ if (hwpt_is_paging(hwpt))
+ iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev);
mutex_unlock(&idev->igroup->lock);
/* Caller must destroy hwpt */
@@ -407,40 +428,36 @@ iommufd_device_do_attach(struct iommufd_device *idev,
return NULL;
}
-static struct iommufd_hw_pagetable *
-iommufd_device_do_replace(struct iommufd_device *idev,
- struct iommufd_hw_pagetable *hwpt)
+static void iommufd_group_remove_reserved_iova(struct iommufd_group *igroup,
+ struct iommufd_hw_pagetable *hwpt)
{
- struct iommufd_group *igroup = idev->igroup;
- struct iommufd_hw_pagetable *old_hwpt;
- unsigned int num_devices = 0;
struct iommufd_device *cur;
- int rc;
- mutex_lock(&idev->igroup->lock);
+ lockdep_assert_held(&igroup->lock);
- if (igroup->hwpt == NULL) {
- rc = -EINVAL;
- goto err_unlock;
- }
+ list_for_each_entry(cur, &igroup->device_list, group_item)
+ iopt_remove_reserved_iova(&hwpt->ioas->iopt, cur->dev);
+}
- if (hwpt == igroup->hwpt) {
- mutex_unlock(&idev->igroup->lock);
- return NULL;
- }
+static int iommufd_group_do_replace_paging(struct iommufd_group *igroup,
+ struct iommufd_hw_pagetable *hwpt)
+{
+ struct iommufd_hw_pagetable *old_hwpt = igroup->hwpt;
+ struct iommufd_device *cur;
+ int rc;
+
+ lockdep_assert_held(&igroup->lock);
/* Try to upgrade the domain we have */
list_for_each_entry(cur, &igroup->device_list, group_item) {
- num_devices++;
if (cur->enforce_cache_coherency) {
rc = iommufd_hw_pagetable_enforce_cc(hwpt);
if (rc)
- goto err_unlock;
+ return rc;
}
}
- old_hwpt = igroup->hwpt;
- if (hwpt->ioas != old_hwpt->ioas) {
+ if (hwpt_is_paging(old_hwpt) && hwpt->ioas != old_hwpt->ioas) {
list_for_each_entry(cur, &igroup->device_list, group_item) {
rc = iopt_table_enforce_dev_resv_regions(
&hwpt->ioas->iopt, cur->dev, NULL);
@@ -448,23 +465,57 @@ iommufd_device_do_replace(struct iommufd_device *idev,
goto err_unresv;
}
}
-
- rc = iommufd_group_setup_msi(idev->igroup, hwpt);
+ rc = iommufd_group_setup_msi(igroup, hwpt);
if (rc)
goto err_unresv;
+ return 0;
+
+err_unresv:
+ iommufd_group_remove_reserved_iova(igroup, hwpt);
+ return rc;
+}
+
+static struct iommufd_hw_pagetable *
+iommufd_device_do_replace(struct iommufd_device *idev,
+ struct iommufd_hw_pagetable *hwpt)
+{
+ struct iommufd_group *igroup = idev->igroup;
+ struct iommufd_hw_pagetable *old_hwpt;
+ unsigned int num_devices = 0;
+ struct iommufd_device *cur;
+ int rc;
+
+ mutex_lock(&idev->igroup->lock);
+
+ if (igroup->hwpt == NULL) {
+ rc = -EINVAL;
+ goto err_unlock;
+ }
+
+ if (hwpt == igroup->hwpt) {
+ mutex_unlock(&idev->igroup->lock);
+ return NULL;
+ }
+
+ if (hwpt_is_paging(hwpt)) {
+ rc = iommufd_group_do_replace_paging(igroup, hwpt);
+ if (rc)
+ goto err_unlock;
+ }
rc = iommu_group_replace_domain(igroup->group, hwpt->domain);
if (rc)
goto err_unresv;
- if (hwpt->ioas != old_hwpt->ioas) {
- list_for_each_entry(cur, &igroup->device_list, group_item)
- iopt_remove_reserved_iova(&old_hwpt->ioas->iopt,
- cur->dev);
- }
+ old_hwpt = igroup->hwpt;
+ if (hwpt_is_paging(old_hwpt) &&
+ (!hwpt_is_paging(hwpt) || hwpt->ioas != old_hwpt->ioas))
+ iommufd_group_remove_reserved_iova(igroup, old_hwpt);
igroup->hwpt = hwpt;
+ list_for_each_entry(cur, &igroup->device_list, group_item)
+ num_devices++;
/*
* Move the refcounts held by the device_list to the new hwpt. Retain a
* refcount for this thread as the caller will free it.
@@ -478,8 +529,8 @@ iommufd_device_do_replace(struct iommufd_device *idev,
/* Caller must destroy old_hwpt */
return old_hwpt;
err_unresv:
- list_for_each_entry(cur, &igroup->device_list, group_item)
- iopt_remove_reserved_iova(&hwpt->ioas->iopt, cur->dev);
+ if (hwpt_is_paging(hwpt))
+ iommufd_group_remove_reserved_iova(igroup, hwpt);
err_unlock:
mutex_unlock(&idev->igroup->lock);
return ERR_PTR(rc);
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index 07ce35f09599..6244ffddee6e 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -240,6 +240,11 @@ struct iommufd_hw_pagetable {
struct list_head hwpt_item;
};
+static inline bool hwpt_is_paging(struct iommufd_hw_pagetable *hwpt)
+{
+ return hwpt->obj.type == IOMMUFD_OBJ_HWPT_PAGING;
+}
+
struct iommufd_hw_pagetable *
iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
struct iommufd_device *idev, u32 flags,
--
2.34.1
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