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<7e5f2c33-c6c3-f344-9014-1f6a306c55aa@linux.intel.com> In-Reply-To: <7e5f2c33-c6c3-f344-9014-1f6a306c55aa@linux.intel.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.29.8.19] MIME-Version: 1.0 Cc: Tony W Wang-oc , CobeChen-oc , Ashok Raj X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============9102775165268841522==" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" --===============9102775165268841522== Content-Language: zh-CN Content-Type: multipart/alternative; boundary="_000_cfdd29a882d140e5aec2e8c3b77f4968zhaoxincom_" --_000_cfdd29a882d140e5aec2e8c3b77f4968zhaoxincom_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 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hi baolu,

> So you have a hidden device (invisible to host k= ernel). But you need to

>setup some iden= tity mappings for this device, so that the firmware
>could keep working= , right?

>The platform desig= ns this by putting that range in the RMRR table and
>expecting the OS k= ernel to setup identity mappings during boot.

>Do I understand it= right?


Yes. What you under= stand is correct.


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=C22=C8=D5 10:32:36
=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; Ashok Raj
=D6=F7=CC=E2: Re: =B4=F0=B8=B4: [PATCH v3 2/2] iommu/vt-d:Add suppor= t for probing ACPI device in RMRR
 
On 9/1/20 5:13 PM, FelixCui-oc wrote:
> hi  baolu ,
>
>                    &= nbsp;These ACPI devices can be retrieved from the kernel
> and there is no bound device driver .

So you have a hidden device (invisible to host kernel). But you need to
setup some identity mappings for this device, so that the firmware
could keep working, right?

The platform designs this by putting that range in the RMRR table and
expecting the OS kernel to setup identity mappings during boot.

Do I understand it right?

Best regards,
baolu

>
>
> Best regards
>
> Felixcui-oc
>
> ----------------------------------------------------------------------= --
> *=B7=A2=BC=FE=C8=CB:* Lu Baolu <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 bou= nd
> for it?
>
> Best regards,
> baolu
>
>>
>> Signed-off-by: FelixCuioc <FelixCui-oc@zhaoxin.com>
>> ---
>>   drivers/iommu/intel/iommu.c | 29 ++++&= #43;++++++++++++++&= #43;+++++++++
>>   drivers/iommu/iommu.c     &nb= sp; |  6 ++++++
>>   include/linux/iommu.h     &nb= sp; |  3 +++
>>   3 files changed, 38 insertions(+)
>>
>> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iom= mu.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_= iommu(void)
>>        return 1;
>>   }
>>  
>> +static int acpi_device_create_direct_mappings(struct device *= pn_dev, struct device *acpi_device)
>> +{
>> +     struct iommu_group *group;
>> +
>> +     acpi_device->bus->iommu_ops = =3D &intel_iommu_ops;
>> +     group =3D iommu_group_get(pn_dev); >> +     if (!group) {
>> +          &= nbsp;  pr_warn("ACPI name space devices create direct mappings wr= ong!\n");
>> +          &= nbsp;  return -EINVAL;
>> +     }
>> +     __acpi_device_create_direct_mappings= (group, acpi_device);
>> +
>> +     return 0;
>> +}
>> +
>>   static int __init probe_acpi_namespace_devices(void) >>   {
>>        struct dmar_drhd_unit *d= rhd;
>> @@ -4813,6 +4828,7 @@ static int __init probe_acpi_namespace_d= evices(void)
>>           &= nbsp;            str= uct acpi_device_physical_node *pn;
>>           &= nbsp;            str= uct iommu_group *group;
>>           &= nbsp;            str= uct acpi_device *adev;
>> +          &= nbsp;          struct device *= pn_dev =3D NULL;
>>  
>>           &= nbsp;            if = (dev->bus !=3D &acpi_bus_type)
>>           &= nbsp;           &nbs= p;        continue;
>> @@ -4823,6 +4839,7 @@ static int __init probe_acpi_namespace_d= evices(void)
>>           &= nbsp;           &nbs= p;            &= nbsp;       &adev->physical_node_list,= node) {
>>           &= nbsp;           &nbs= p;        group =3D iommu_group_get(pn-&= gt;dev);
>>           &= nbsp;           &nbs= p;        if (group) {
>> +          &= nbsp;           &nbs= p;            &= nbsp; pn_dev =3D pn->dev;
>>           &= nbsp;           &nbs= p;            &= nbsp;   iommu_group_put(group);
>>           &= nbsp;           &nbs= p;            &= nbsp;   continue;
>>           &= nbsp;           &nbs= p;        }
>> @@ -4831,7 +4848,19 @@ static int __init probe_acpi_namespace_= devices(void)
>>           &= nbsp;           &nbs= p;        ret =3D iommu_probe_device(pn-= >dev);
>>           &= nbsp;           &nbs= p;        if (ret)
>>           &= nbsp;           &nbs= p;            &= nbsp;   break;
>> +          &= nbsp;           &nbs= p;      pn_dev =3D pn->dev;
>> +          &= nbsp;          }
>> +          &= nbsp;          if (!pn_dev) {<= br> >> +          &= nbsp;           &nbs= p;      dev->bus->iommu_ops =3D &intel_i= ommu_ops;
>> +          &= nbsp;           &nbs= p;      ret =3D iommu_probe_device(dev);
>> +          &= nbsp;           &nbs= p;      if (ret) {
>> +          &= nbsp;           &nbs= p;            &= nbsp; pr_err("acpi_device probe fail! ret:%d\n", ret);
>> +          &= nbsp;           &nbs= p;            &= nbsp; goto unlock;
>> +          &= nbsp;           &nbs= p;      }
>> +          &= nbsp;           &nbs= p;      goto unlock;
>>           &= nbsp;            } >> +          &= nbsp;          ret =3D acpi_de= vice_create_direct_mappings(pn_dev, dev);
>> +unlock:
>>           &= nbsp;            mut= ex_unlock(&adev->physical_node_lock);
>>  
>>           &= nbsp;            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(stru= ct iommu_domain *domain,
>>        return false;
>>   }
>>  
>> +void  __acpi_device_create_direct_mappings(struct iommu_= group *group, struct device *acpi_device)
>> +{
>> +     iommu_create_device_direct_mappings(= group, acpi_device);
>> +}
>> +EXPORT_SYMBOL_GPL(__acpi_device_create_direct_mappings);
>> +
>>   /**
>>    * iommu_group_add_device - add a device to an io= mmu group
>>    * @group: the group into which to add the device= (reference 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(st= ruct iommu_domain *domain, u32 wnd_nr)
>>   extern int report_iommu_fault(struct iommu_domain *dom= ain, struct device *dev,
>>           &= nbsp;           &nbs= p;      unsigned long iova, int flags);
>>  
>> +extern void __acpi_device_create_direct_mappings(struct iommu= _group *group,
>> +          &= nbsp;           &nbs= p;            &= nbsp;         struct device *acpi_d= evice);
>> +
>>   static inline void iommu_flush_tlb_all(struct iommu_do= main *domain)
>>   {
>>        if (domain->ops->f= lush_iotlb_all)
>>
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