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hi  baolu , 

                   These = ACPI devices can be retrieved from the kernel and there is no bound device = driver .


Best regards

Felixcui-oc

=B7=A2=BC=FE=C8=CB: Lu Ba= olu <baolu.lu@linux.intel.com>
=B7=A2=CB=CD=CA=B1=BC=E4: 2020=C4=EA9=D4=C21=C8=D5 14:12:34
=CA=D5=BC=FE=C8=CB: FelixCui-oc; Joerg Roedel; iommu@lists.linux-fou= ndation.org; linux-kernel@vger.kernel.org; David Woodhouse; Dan Carpenter; = kbuild@lists.01.org
=B3=AD=CB=CD: baolu.lu@linux.intel.com; CobeChen-oc; RaymondPang-oc;= Tony W Wang-oc
=D6=F7=CC=E2: Re: [PATCH v3 2/2] iommu/vt-d:Add support for probing = ACPI device in RMRR
 
Hi Felix,

On 8/27/20 6:02 PM, FelixCuioc wrote:
> After acpi device in RMRR is detected,it is necessary
> to establish a mapping for these devices.
> In acpi_device_create_direct_mappings(),create a mapping
> for the acpi device in RMRR.
> Add a helper to achieve the acpi namespace device can
> access the RMRR region.

Are those ACPI devices visible to kernel? If so, any device driver bound for it?

Best regards,
baolu

>
> Signed-off-by: FelixCuioc <FelixCui-oc@zhaoxin.com>
> ---
>   drivers/iommu/intel/iommu.c | 29 +++++= +++++++++++++++= +++++++++
>   drivers/iommu/iommu.c       = |  6 ++++++
>   include/linux/iommu.h       = |  3 +++
>   3 files changed, 38 insertions(+)
>
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c=
> index 208a91605288..51d7a5b18f41 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4799,6 +4799,21 @@ static int __init platform_optin_force_iomm= u(void)
>        return 1;
>   }
>  
> +static int acpi_device_create_direct_mappings(struct device *pn_d= ev, struct device *acpi_device)
> +{
> +     struct iommu_group *group;
> +
> +     acpi_device->bus->iommu_ops =3D &a= mp;intel_iommu_ops;
> +     group =3D iommu_group_get(pn_dev);
> +     if (!group) {
> +           = ;  pr_warn("ACPI name space devices create direct mappings wrong!= \n");
> +           = ;  return -EINVAL;
> +     }
> +     __acpi_device_create_direct_mappings(gro= up, acpi_device);
> +
> +     return 0;
> +}
> +
>   static int __init probe_acpi_namespace_devices(void)
>   {
>        struct dmar_drhd_unit *drhd;=
> @@ -4813,6 +4828,7 @@ static int __init probe_acpi_namespace_devic= es(void)
>            = ;            struct = acpi_device_physical_node *pn;
>            = ;            struct = iommu_group *group;
>            = ;            struct = acpi_device *adev;
> +           = ;          struct device *pn_d= ev =3D NULL;
>  
>            = ;            if (dev= ->bus !=3D &acpi_bus_type)
>            = ;            &n= bsp;       continue;
> @@ -4823,6 +4839,7 @@ static int __init probe_acpi_namespace_devic= es(void)
>            = ;            &n= bsp;            = ;       &adev->physical_node_list, nod= e) {
>            = ;            &n= bsp;       group =3D iommu_group_get(pn->d= ev);
>            = ;            &n= bsp;       if (group) {
> +           = ;            &n= bsp;            = ; pn_dev =3D pn->dev;
>            = ;            &n= bsp;            = ;   iommu_group_put(group);
>            = ;            &n= bsp;            = ;   continue;
>            = ;            &n= bsp;       }
> @@ -4831,7 +4848,19 @@ static int __init probe_acpi_namespace_devi= ces(void)
>            = ;            &n= bsp;       ret =3D iommu_probe_device(pn->= dev);
>            = ;            &n= bsp;       if (ret)
>            = ;            &n= bsp;            = ;   break;
> +           = ;            &n= bsp;     pn_dev =3D pn->dev;
> +           = ;          }
> +           = ;          if (!pn_dev) {
> +           = ;            &n= bsp;     dev->bus->iommu_ops =3D &intel_iommu= _ops;
> +           = ;            &n= bsp;     ret =3D iommu_probe_device(dev);
> +           = ;            &n= bsp;     if (ret) {
> +           = ;            &n= bsp;            = ; pr_err("acpi_device probe fail! ret:%d\n", ret);
> +           = ;            &n= bsp;            = ; goto unlock;
> +           = ;            &n= bsp;     }
> +           = ;            &n= bsp;     goto unlock;
>            = ;            }
> +           = ;          ret =3D acpi_device= _create_direct_mappings(pn_dev, dev);
> +unlock:
>            = ;            mutex_u= nlock(&adev->physical_node_lock);
>  
>            = ;            if (ret= )
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 609bd25bf154..4f714a2d5ef7 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -779,6 +779,12 @@ static bool iommu_is_attach_deferred(struct i= ommu_domain *domain,
>        return false;
>   }
>  
> +void  __acpi_device_create_direct_mappings(struct iommu_grou= p *group, struct device *acpi_device)
> +{
> +     iommu_create_device_direct_mappings(grou= p, acpi_device);
> +}
> +EXPORT_SYMBOL_GPL(__acpi_device_create_direct_mappings);
> +
>   /**
>    * iommu_group_add_device - add a device to an iommu = group
>    * @group: the group into which to add the device (re= ference should be held)
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index fee209efb756..9be134775886 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -514,6 +514,9 @@ extern void iommu_domain_window_disable(struct= iommu_domain *domain, u32 wnd_nr)
>   extern int report_iommu_fault(struct iommu_domain *domain,= struct device *dev,
>            = ;            &n= bsp;     unsigned long iova, int flags);
>  
> +extern void __acpi_device_create_direct_mappings(struct iommu_gro= up *group,
> +           = ;            &n= bsp;            = ;         struct device *acpi_devic= e);
> +
>   static inline void iommu_flush_tlb_all(struct iommu_domain= *domain)
>   {
>        if (domain->ops->flush= _iotlb_all)
>
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