diff options
| -rw-r--r-- | drivers/iommu/iommufd/device.c | 87 | ||||
| -rw-r--r-- | drivers/iommu/iommufd/hw_pagetable.c | 45 | ||||
| -rw-r--r-- | drivers/iommu/iommufd/iommufd_private.h | 6 |
3 files changed, 85 insertions, 53 deletions
diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 4483c06e0ec3..8dc7ed678e3f 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -177,13 +177,16 @@ static bool iommufd_hw_pagetable_has_group(struct iommufd_hw_pagetable *hwpt, return false; } -static int iommufd_device_do_attach(struct iommufd_device *idev, - struct iommufd_hw_pagetable *hwpt) +int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev) { phys_addr_t sw_msi_start = PHYS_ADDR_MAX; int rc; - mutex_lock(&hwpt->devices_lock); + lockdep_assert_held(&hwpt->devices_lock); + + if (WARN_ON(idev->hwpt)) + return -EINVAL; /* * Try to upgrade the domain we have, it is an iommu driver bug to @@ -198,19 +201,18 @@ static int iommufd_device_do_attach(struct iommufd_device *idev, hwpt->domain); if (!hwpt->enforce_cache_coherency) { WARN_ON(list_empty(&hwpt->devices)); - rc = -EINVAL; - goto out_unlock; + return -EINVAL; } } rc = iopt_table_enforce_group_resv_regions(&hwpt->ioas->iopt, idev->dev, idev->group, &sw_msi_start); if (rc) - goto out_unlock; + return rc; rc = iommufd_device_setup_msi(idev, hwpt, sw_msi_start); if (rc) - goto out_iova; + goto err_unresv; /* * FIXME: Hack around missing a device-centric iommu api, only attach to @@ -219,27 +221,35 @@ static int iommufd_device_do_attach(struct iommufd_device *idev, if (!iommufd_hw_pagetable_has_group(hwpt, idev->group)) { rc = iommu_attach_group(hwpt->domain, idev->group); if (rc) - goto out_iova; - - if (list_empty(&hwpt->devices)) { - rc = iopt_table_add_domain(&hwpt->ioas->iopt, - hwpt->domain); - if (rc) - goto out_detach; - list_add_tail(&hwpt->hwpt_item, &hwpt->ioas->hwpt_list); - } + goto err_unresv; } + return 0; +err_unresv: + iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev); + return rc; +} + +void iommufd_hw_pagetable_detach(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev) +{ + if (!iommufd_hw_pagetable_has_group(hwpt, idev->group)) + iommu_detach_group(hwpt->domain, idev->group); + iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev); +} + +static int iommufd_device_do_attach(struct iommufd_device *idev, + struct iommufd_hw_pagetable *hwpt) +{ + int rc; + + mutex_lock(&hwpt->devices_lock); + rc = iommufd_hw_pagetable_attach(hwpt, idev); + if (rc) + goto out_unlock; idev->hwpt = hwpt; refcount_inc(&hwpt->obj.users); list_add(&idev->devices_item, &hwpt->devices); - mutex_unlock(&hwpt->devices_lock); - return 0; - -out_detach: - iommu_detach_group(hwpt->domain, idev->group); -out_iova: - iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev); out_unlock: mutex_unlock(&hwpt->devices_lock); return rc; @@ -281,23 +291,16 @@ static int iommufd_device_auto_get_domain(struct iommufd_device *idev, goto out_unlock; } - hwpt = iommufd_hw_pagetable_alloc(idev->ictx, ioas, idev->dev); + hwpt = iommufd_hw_pagetable_alloc(idev->ictx, ioas, idev, true); if (IS_ERR(hwpt)) { rc = PTR_ERR(hwpt); goto out_unlock; } hwpt->auto_domain = true; - rc = iommufd_device_do_attach(idev, hwpt); - if (rc) - goto out_abort; - mutex_unlock(&ioas->mutex); iommufd_object_finalize(idev->ictx, &hwpt->obj); return 0; - -out_abort: - iommufd_object_abort_and_destroy(idev->ictx, &hwpt->obj); out_unlock: mutex_unlock(&ioas->mutex); return rc; @@ -371,10 +374,8 @@ void iommufd_device_detach(struct iommufd_device *idev) mutex_lock(&hwpt->devices_lock); list_del(&idev->devices_item); - if (!iommufd_hw_pagetable_has_group(hwpt, idev->group)) - iommu_detach_group(hwpt->domain, idev->group); - iopt_remove_reserved_iova(&hwpt->ioas->iopt, idev->dev); idev->hwpt = NULL; + iommufd_hw_pagetable_detach(hwpt, idev); mutex_unlock(&hwpt->devices_lock); if (hwpt->auto_domain) @@ -716,28 +717,18 @@ iommufd_device_selftest_attach(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, struct device *mock_dev) { + struct iommufd_device tmp_idev = { .dev = mock_dev }; struct iommufd_hw_pagetable *hwpt; - int rc; - - hwpt = iommufd_hw_pagetable_alloc(ictx, ioas, mock_dev); - if (IS_ERR(hwpt)) - return hwpt; - - rc = iopt_table_add_domain(&hwpt->ioas->iopt, hwpt->domain); - if (rc) - goto out_hwpt; mutex_lock(&ioas->mutex); - list_add_tail(&hwpt->hwpt_item, &hwpt->ioas->hwpt_list); + hwpt = iommufd_hw_pagetable_alloc(ictx, ioas, &tmp_idev, false); mutex_unlock(&ioas->mutex); + if (IS_ERR(hwpt)) + return hwpt; refcount_inc(&hwpt->obj.users); iommufd_object_finalize(ictx, &hwpt->obj); return hwpt; - -out_hwpt: - iommufd_object_abort_and_destroy(ictx, &hwpt->obj); - return ERR_PTR(rc); } void iommufd_device_selftest_detach(struct iommufd_ctx *ictx, diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index 10db1359c067..6cdb6749d359 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -32,17 +32,22 @@ void iommufd_hw_pagetable_destroy(struct iommufd_object *obj) * iommufd_hw_pagetable_alloc() - Get an iommu_domain for a device * @ictx: iommufd context * @ioas: IOAS to associate the domain with - * @dev: Device to get an iommu_domain for + * @idev: Device to get an iommu_domain for + * @immediate_attach: True if idev should be attached to the hwpt * - * Allocate a new iommu_domain and return it as a hw_pagetable. + * Allocate a new iommu_domain and return it as a hw_pagetable. The HWPT + * will be linked to the given ioas and upon return the underlying iommu_domain + * is fully popoulated. */ struct iommufd_hw_pagetable * iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, - struct device *dev) + struct iommufd_device *idev, bool immediate_attach) { struct iommufd_hw_pagetable *hwpt; int rc; + lockdep_assert_held(&ioas->mutex); + hwpt = iommufd_object_alloc(ictx, hwpt, IOMMUFD_OBJ_HW_PAGETABLE); if (IS_ERR(hwpt)) return hwpt; @@ -54,14 +59,46 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, refcount_inc(&ioas->obj.users); hwpt->ioas = ioas; - hwpt->domain = iommu_domain_alloc(dev->bus); + hwpt->domain = iommu_domain_alloc(idev->dev->bus); if (!hwpt->domain) { rc = -ENOMEM; goto out_abort; } + mutex_lock(&hwpt->devices_lock); + + /* + * immediate_attach exists only to accommodate iommu drivers that cannot + * directly allocate a domain. These drivers do not finish creating the + * domain until attach is completed. Thus we must have this call + * sequence. Once those drivers are fixed this should be removed. + */ + if (immediate_attach) { + rc = iommufd_hw_pagetable_attach(hwpt, idev); + if (rc) + goto out_unlock; + } + + rc = iopt_table_add_domain(&hwpt->ioas->iopt, hwpt->domain); + if (rc) + goto out_detach; + list_add_tail(&hwpt->hwpt_item, &hwpt->ioas->hwpt_list); + + if (immediate_attach) { + /* See iommufd_device_do_attach() */ + refcount_inc(&hwpt->obj.users); + idev->hwpt = hwpt; + list_add(&idev->devices_item, &hwpt->devices); + } + + mutex_unlock(&hwpt->devices_lock); return hwpt; +out_detach: + if (immediate_attach) + iommufd_hw_pagetable_detach(hwpt, idev); +out_unlock: + mutex_unlock(&hwpt->devices_lock); out_abort: iommufd_object_abort_and_destroy(ictx, &hwpt->obj); return ERR_PTR(rc); diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 84fe19a19546..331664e917b7 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -255,7 +255,11 @@ struct iommufd_hw_pagetable { struct iommufd_hw_pagetable * iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, - struct device *dev); + struct iommufd_device *idev, bool immediate_attach); +int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev); +void iommufd_hw_pagetable_detach(struct iommufd_hw_pagetable *hwpt, + struct iommufd_device *idev); void iommufd_hw_pagetable_destroy(struct iommufd_object *obj); /* |