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From: Stewart Hildebrand <stewart.hildebrand@amd.com>
To: <xen-devel@lists.xenproject.org>
CC: Rahul Singh <rahul.singh@arm.com>, Bertrand Marquis
<bertrand.marquis@arm.com>, Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.org>, Volodymyr Babchuk
<Volodymyr_Babchuk@epam.com>, Stewart Hildebrand <stewart.hildebrand@amd.com>
Subject: [PATCH v4 7/7] xen/arm: smmuv3: Add PCI devices support for SMMUv3
Date: Tue, 6 Jun 2023 23:02:20 -0400
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Content-Type: text/plain; charset="utf-8"
From: Rahul Singh <rahul.singh@arm.com>
Signed-off-by: Rahul Singh <rahul.singh@arm.com>
Signed-off-by: Stewart Hildebrand <stewart.hildebrand@amd.com>
---
v3->v4:
* no change
v2->v3:
* rebase
* invoke iommu_add_pci_sideband_ids() from add_device hook
v1->v2:
* ignore add_device/assign_device/reassign_device calls for phantom functio=
ns
(i.e. devfn !=3D pdev->devfn)
downstream->v1:
* rebase
* move 2 replacements of s/dt_device_set_protected(dev_to_dt(dev))/device_s=
et_protected(dev)/
from this commit to ("xen/arm: Move is_protected flag to struct device")
so as to not break ability to bisect
* adjust patch title (remove stray space)
* arm_smmu_(de)assign_dev: return error instead of crashing system
* remove arm_smmu_remove_device() stub
* update condition in arm_smmu_reassign_dev
* style fixup
(cherry picked from commit 7ed6c3ab250d899fe6e893a514278e406a2893e8 from
the downstream branch poc/pci-passthrough from
https://gitlab.com/xen-project/people/bmarquis/xen-arm-poc.git)
---
This is a file imported from Linux with modifications for Xen. What should =
be
the coding style used for Xen modifications?
---
xen/drivers/passthrough/arm/smmu-v3.c | 76 +++++++++++++++++++++++++--
1 file changed, 72 insertions(+), 4 deletions(-)
diff --git a/xen/drivers/passthrough/arm/smmu-v3.c b/xen/drivers/passthroug=
h/arm/smmu-v3.c
index 8842db1ec07e..427946e68f9d 100644
--- a/xen/drivers/passthrough/arm/smmu-v3.c
+++ b/xen/drivers/passthrough/arm/smmu-v3.c
@@ -1469,14 +1469,32 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_d=
evice *smmu, u32 sid)
}
/* Forward declaration */
static struct arm_smmu_device *arm_smmu_get_by_dev(const struct device *de=
v);
+static int arm_smmu_assign_dev(struct domain *d, u8 devfn,
+ struct device *dev, u32 flag);
=20
static int arm_smmu_add_device(u8 devfn, struct device *dev)
{
int i, ret;
struct arm_smmu_device *smmu;
struct arm_smmu_master *master;
- struct iommu_fwspec *fwspec =3D dev_iommu_fwspec_get(dev);
+ struct iommu_fwspec *fwspec;
+
+#ifdef CONFIG_HAS_PCI
+ if ( dev_is_pci(dev) )
+ {
+ struct pci_dev *pdev =3D dev_to_pci(dev);
+ int ret;
+
+ if ( devfn !=3D pdev->devfn )
+ return 0;
+
+ ret =3D iommu_add_pci_sideband_ids(pdev);
+ if ( ret < 0 )
+ iommu_fwspec_free(dev);
+ }
+#endif
=20
+ fwspec =3D dev_iommu_fwspec_get(dev);
if (!fwspec)
return -ENODEV;
=20
@@ -1533,6 +1551,17 @@ static int arm_smmu_add_device(u8 devfn, struct devi=
ce *dev)
dev_info(dev, "Added master device (SMMUv3 %s StreamIds %u)\n",
dev_name(fwspec->iommu_dev), fwspec->num_ids);
=20
+#ifdef CONFIG_HAS_PCI
+ if ( dev_is_pci(dev) )
+ {
+ struct pci_dev *pdev =3D dev_to_pci(dev);
+
+ ret =3D arm_smmu_assign_dev(pdev->domain, devfn, dev, 0);
+ if (ret)
+ goto err_free_master;
+ }
+#endif
+
return 0;
=20
err_free_master:
@@ -2622,6 +2651,27 @@ static int arm_smmu_assign_dev(struct domain *d, u8 =
devfn,
struct arm_smmu_domain *smmu_domain;
struct arm_smmu_xen_domain *xen_domain =3D dom_iommu(d)->arch.priv;
=20
+#ifdef CONFIG_HAS_PCI
+ if ( dev_is_pci(dev) && !is_hardware_domain(d) )
+ {
+ struct pci_dev *pdev =3D dev_to_pci(dev);
+
+ printk(XENLOG_INFO "Assigning device %04x:%02x:%02x.%u to dom%d\n",
+ pdev->seg, pdev->bus, PCI_SLOT(devfn),
+ PCI_FUNC(devfn), d->domain_id);
+
+ if ( devfn !=3D pdev->devfn || pdev->domain =3D=3D d )
+ return 0;
+
+ list_move(&pdev->domain_list, &d->pdev_list);
+ pdev->domain =3D d;
+
+ /* dom_io is used as a sentinel for quarantined devices */
+ if ( d =3D=3D dom_io )
+ return 0;
+ }
+#endif
+
spin_lock(&xen_domain->lock);
=20
/*
@@ -2655,7 +2705,7 @@ out:
return ret;
}
=20
-static int arm_smmu_deassign_dev(struct domain *d, struct device *dev)
+static int arm_smmu_deassign_dev(struct domain *d, uint8_t devfn, struct d=
evice *dev)
{
struct iommu_domain *io_domain =3D arm_smmu_get_domain(d, dev);
struct arm_smmu_xen_domain *xen_domain =3D dom_iommu(d)->arch.priv;
@@ -2667,6 +2717,24 @@ static int arm_smmu_deassign_dev(struct domain *d, s=
truct device *dev)
return -ESRCH;
}
=20
+#ifdef CONFIG_HAS_PCI
+ if ( dev_is_pci(dev) )
+ {
+ struct pci_dev *pdev =3D dev_to_pci(dev);
+
+ printk(XENLOG_INFO "Deassigning device %04x:%02x:%02x.%u from dom%d\n",
+ pdev->seg, pdev->bus, PCI_SLOT(devfn),
+ PCI_FUNC(devfn), d->domain_id);
+
+ if ( devfn !=3D pdev->devfn )
+ return 0;
+
+ /* dom_io is used as a sentinel for quarantined devices */
+ if ( d =3D=3D dom_io )
+ return 0;
+ }
+#endif
+
spin_lock(&xen_domain->lock);
=20
arm_smmu_detach_dev(master);
@@ -2686,13 +2754,13 @@ static int arm_smmu_reassign_dev(struct domain *s, =
struct domain *t,
int ret =3D 0;
=20
/* Don't allow remapping on other domain than hwdom */
- if ( t && !is_hardware_domain(t) )
+ if ( t && !is_hardware_domain(t) && (t !=3D dom_io) )
return -EPERM;
=20
if (t =3D=3D s)
return 0;
=20
- ret =3D arm_smmu_deassign_dev(s, dev);
+ ret =3D arm_smmu_deassign_dev(s, devfn, dev);
if (ret)
return ret;
=20
--=20
2.40.1