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Message-ID: <DM5PR11MB1435FC443BA55D9665795718C3D10@DM5PR11MB1435.namprd11.prod.outlook.com>
Date: Tue, 5 Jan 2021 05:58:57 +0000
From: "Liu, Yi L" <yi.l.liu@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>,
"joro@...tes.org" <joro@...tes.org>,
"will@...nel.org" <will@...nel.org>
CC: "Tian, Kevin" <kevin.tian@...el.com>,
"jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
"Raj, Ashok" <ashok.raj@...el.com>,
"Tian, Jun J" <jun.j.tian@...el.com>,
"Sun, Yi Y" <yi.y.sun@...el.com>,
"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Zeng, Xin" <xin.zeng@...el.com>
Subject: RE: [PATCH v3 2/3] iommu/vt-d: Track device aux-attach with
subdevice_domain_info
Hi Baolu,
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, December 29, 2020 4:38 PM
>
> Hi Yi,
>
> On 2020/12/29 11:25, Liu Yi L wrote:
> > In the existing code, loop all devices attached to a domain does not
> > include sub-devices attached via iommu_aux_attach_device().
> >
> > This was found by when I'm working on the belwo patch, There is no
> ^^^^^
> below
nice catch. 😉
> > device in the domain->devices list, thus unable to get the cap and
> > ecap of iommu unit. But this domain actually has subdevice which is
> > attached via aux-manner. But it is tracked by domain. This patch is
> > going to fix it.
> >
> > https://lore.kernel.org/kvm/1599734733-6431-17-git-send-email-
> yi.l.liu@...el.com/
> >
> > And this fix goes beyond the patch above, such sub-device tracking is
> > necessary for other cases. For example, flushing device_iotlb for a
> > domain which has sub-devices attached by auxiliary manner.
> >
> > Co-developed-by: Xin Zeng <xin.zeng@...el.com>
> > Signed-off-by: Xin Zeng <xin.zeng@...el.com>
> > Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
>
> Others look good to me.
>
> Fixes: 67b8e02b5e761 ("iommu/vt-d: Aux-domain specific domain
> attach/detach")
> Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
thanks,
Regards,
Yi Liu
> Best regards,
> baolu
>
> > ---
> > drivers/iommu/intel/iommu.c | 95 +++++++++++++++++++++++++++--------
> --
> > include/linux/intel-iommu.h | 16 +++++--
> > 2 files changed, 82 insertions(+), 29 deletions(-)
> >
> > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> > index 788119c5b021..d7720a836268 100644
> > --- a/drivers/iommu/intel/iommu.c
> > +++ b/drivers/iommu/intel/iommu.c
> > @@ -1877,6 +1877,7 @@ static struct dmar_domain *alloc_domain(int
> flags)
> > domain->flags |= DOMAIN_FLAG_USE_FIRST_LEVEL;
> > domain->has_iotlb_device = false;
> > INIT_LIST_HEAD(&domain->devices);
> > + INIT_LIST_HEAD(&domain->subdevices);
> >
> > return domain;
> > }
> > @@ -2547,7 +2548,7 @@ static struct dmar_domain
> *dmar_insert_one_dev_info(struct intel_iommu *iommu,
> > info->iommu = iommu;
> > info->pasid_table = NULL;
> > info->auxd_enabled = 0;
> > - INIT_LIST_HEAD(&info->auxiliary_domains);
> > + INIT_LIST_HEAD(&info->subdevices);
> >
> > if (dev && dev_is_pci(dev)) {
> > struct pci_dev *pdev = to_pci_dev(info->dev);
> > @@ -4475,33 +4476,61 @@ is_aux_domain(struct device *dev, struct
> iommu_domain *domain)
> > domain->type == IOMMU_DOMAIN_UNMANAGED;
> > }
> >
> > -static void auxiliary_link_device(struct dmar_domain *domain,
> > - struct device *dev)
> > +static inline struct subdev_domain_info *
> > +lookup_subdev_info(struct dmar_domain *domain, struct device *dev)
> > +{
> > + struct subdev_domain_info *sinfo;
> > +
> > + if (!list_empty(&domain->subdevices)) {
> > + list_for_each_entry(sinfo, &domain->subdevices,
> link_domain) {
> > + if (sinfo->pdev == dev)
> > + return sinfo;
> > + }
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +static int auxiliary_link_device(struct dmar_domain *domain,
> > + struct device *dev)
> > {
> > struct device_domain_info *info = get_domain_info(dev);
> > + struct subdev_domain_info *sinfo = lookup_subdev_info(domain,
> dev);
> >
> > assert_spin_locked(&device_domain_lock);
> > if (WARN_ON(!info))
> > - return;
> > + return -EINVAL;
> > +
> > + if (!sinfo) {
> > + sinfo = kzalloc(sizeof(*sinfo), GFP_ATOMIC);
> > + sinfo->domain = domain;
> > + sinfo->pdev = dev;
> > + list_add(&sinfo->link_phys, &info->subdevices);
> > + list_add(&sinfo->link_domain, &domain->subdevices);
> > + }
> >
> > - domain->auxd_refcnt++;
> > - list_add(&domain->auxd, &info->auxiliary_domains);
> > + return ++sinfo->users;
> > }
> >
> > -static void auxiliary_unlink_device(struct dmar_domain *domain,
> > - struct device *dev)
> > +static int auxiliary_unlink_device(struct dmar_domain *domain,
> > + struct device *dev)
> > {
> > struct device_domain_info *info = get_domain_info(dev);
> > + struct subdev_domain_info *sinfo = lookup_subdev_info(domain,
> dev);
> > + int ret;
> >
> > assert_spin_locked(&device_domain_lock);
> > - if (WARN_ON(!info))
> > - return;
> > + if (WARN_ON(!info || !sinfo || sinfo->users <= 0))
> > + return -EINVAL;
> >
> > - list_del(&domain->auxd);
> > - domain->auxd_refcnt--;
> > + ret = --sinfo->users;
> > + if (!ret) {
> > + list_del(&sinfo->link_phys);
> > + list_del(&sinfo->link_domain);
> > + kfree(sinfo);
> > + }
> >
> > - if (!domain->auxd_refcnt && domain->default_pasid > 0)
> > - ioasid_put(domain->default_pasid);
> > + return ret;
> > }
> >
> > static int aux_domain_add_dev(struct dmar_domain *domain,
> > @@ -4530,6 +4559,19 @@ static int aux_domain_add_dev(struct
> dmar_domain *domain,
> > }
> >
> > spin_lock_irqsave(&device_domain_lock, flags);
> > + ret = auxiliary_link_device(domain, dev);
> > + if (ret <= 0)
> > + goto link_failed;
> > +
> > + /*
> > + * Subdevices from the same physical device can be attached to the
> > + * same domain. For such cases, only the first subdevice attachment
> > + * needs to go through the full steps in this function. So if ret >
> > + * 1, just goto out.
> > + */
> > + if (ret > 1)
> > + goto out;
> > +
> > /*
> > * iommu->lock must be held to attach domain to iommu and setup
> the
> > * pasid entry for second level translation.
> > @@ -4548,10 +4590,9 @@ static int aux_domain_add_dev(struct
> dmar_domain *domain,
> > domain->default_pasid);
> > if (ret)
> > goto table_failed;
> > - spin_unlock(&iommu->lock);
> > -
> > - auxiliary_link_device(domain, dev);
> >
> > + spin_unlock(&iommu->lock);
> > +out:
> > spin_unlock_irqrestore(&device_domain_lock, flags);
> >
> > return 0;
> > @@ -4560,8 +4601,10 @@ static int aux_domain_add_dev(struct
> dmar_domain *domain,
> > domain_detach_iommu(domain, iommu);
> > attach_failed:
> > spin_unlock(&iommu->lock);
> > + auxiliary_unlink_device(domain, dev);
> > +link_failed:
> > spin_unlock_irqrestore(&device_domain_lock, flags);
> > - if (!domain->auxd_refcnt && domain->default_pasid > 0)
> > + if (list_empty(&domain->subdevices) && domain->default_pasid > 0)
> > ioasid_put(domain->default_pasid);
> >
> > return ret;
> > @@ -4581,14 +4624,18 @@ static void aux_domain_remove_dev(struct
> dmar_domain *domain,
> > info = get_domain_info(dev);
> > iommu = info->iommu;
> >
> > - auxiliary_unlink_device(domain, dev);
> > -
> > - spin_lock(&iommu->lock);
> > - intel_pasid_tear_down_entry(iommu, dev, domain->default_pasid,
> false);
> > - domain_detach_iommu(domain, iommu);
> > - spin_unlock(&iommu->lock);
> > + if (!auxiliary_unlink_device(domain, dev)) {
> > + spin_lock(&iommu->lock);
> > + intel_pasid_tear_down_entry(iommu, dev,
> > + domain->default_pasid, false);
> > + domain_detach_iommu(domain, iommu);
> > + spin_unlock(&iommu->lock);
> > + }
> >
> > spin_unlock_irqrestore(&device_domain_lock, flags);
> > +
> > + if (list_empty(&domain->subdevices) && domain->default_pasid > 0)
> > + ioasid_put(domain->default_pasid);
> > }
> >
> > static int prepare_domain_attach_device(struct iommu_domain
> *domain,
> > diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> > index 94522685a0d9..09c6a0bf3892 100644
> > --- a/include/linux/intel-iommu.h
> > +++ b/include/linux/intel-iommu.h
> > @@ -533,11 +533,10 @@ struct dmar_domain {
> > /* Domain ids per IOMMU. Use u16
> since
> > * domain ids are 16 bit wide
> according
> > * to VT-d spec, section 9.3 */
> > - unsigned int auxd_refcnt; /* Refcount of auxiliary attaching */
> >
> > bool has_iotlb_device;
> > struct list_head devices; /* all devices' list */
> > - struct list_head auxd; /* link to device's auxiliary list */
> > + struct list_head subdevices; /* all subdevices' list */
> > struct iova_domain iovad; /* iova's that belong to this domain
> */
> >
> > struct dma_pte *pgd; /* virtual address */
> > @@ -610,14 +609,21 @@ struct intel_iommu {
> > struct dmar_drhd_unit *drhd;
> > };
> >
> > +/* Per subdevice private data */
> > +struct subdev_domain_info {
> > + struct list_head link_phys; /* link to phys device siblings */
> > + struct list_head link_domain; /* link to domain siblings */
> > + struct device *pdev; /* physical device derived from */
> > + struct dmar_domain *domain; /* aux-domain */
> > + int users; /* user count */
> > +};
> > +
> > /* PCI domain-device relationship */
> > struct device_domain_info {
> > struct list_head link; /* link to domain siblings */
> > struct list_head global; /* link to global list */
> > struct list_head table; /* link to pasid table */
> > - struct list_head auxiliary_domains; /* auxiliary domains
> > - * attached to this device
> > - */
> > + struct list_head subdevices; /* subdevices sibling */
> > u32 segment; /* PCI segment number */
> > u8 bus; /* PCI bus number */
> > u8 devfn; /* PCI devfn number */
> >
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