Hi baolu,
I understand what you mean is that you want to put the
following processing code in the acpi_device_create_direct_mappings() into the
probe_acpi_namespace_devices() ,right?
If you mean it , I think it's OK.
if (pn_dev == NULL) {
acpi_device->bus->iommu_ops = &intel_iommu_ops;
ret = iommu_probe_device(acpi_device);
if (ret) {
pr_err("acpi_device probe fail! ret:%d\n", ret);
return ret;
}
return 0;
}
Best regards
Felix cui-oc
-----邮件原件-----
发件人: Lu Baolu <baolu...@linux.intel.com>
发送时间: 2020年8月7日 9:08
收件人: FelixCui-oc <felixcui...@zhaoxin.com>; Joerg Roedel <j...@8bytes.org>;
io...@lists.linux-foundation.org; linux-kernel@vger.kernel.org; David Woodhouse
<dw...@infradead.org>
抄送: baolu...@linux.intel.com; RaymondPang-oc <raymondpang...@zhaoxin.com>;
CobeChen-oc <cobechen...@zhaoxin.com>
主题: Re: 答复: 答复: 答复: 答复: 答复: 答复: [PATCH] iommu/vt-d:Add support for ACPI device
in RMRR
Hi Felix,
On 2020/8/6 14:51, FelixCui-oc wrote:
> Hi baolu,
> >Sure. Before that, let me sync my understanding with you. You
> have an acpi namespace device in ANDD table, it also shows up in the device
> scope of a RMRR.
> >Current code doesn't enumerate that device for the RMRR, hence
> iommu_create_device_direct_mappings() doesn't work for this device.
>
> >At the same time, probe_acpi_namespace_devices() doesn't work
> for this device, hence you want to add a home-made
> >acpi_device_create_direct_mappings() helper.
>
> Your understanding is right.
> But there is a problem that even if the namespace device in
> rmrr is enumerated in the code, probe_acpi_namespace_devices() also doesn't
> work for this device.
> This is because the dev parameter of the
> iommu_create_device_direct_mappings() is not the namespace device in RMRR.
> The actual parameter passed in is the namespace device's
> physical node device.
> In iommu_create_device_direct_mappings(), the physical node
> device passed in cannot match the namespace device in rmrr->device[],right?
> We need acpi_device_create_direct_mappings() helper ?
>
> In addition, adev->physical_node_list is related to the __HID
> of namespace device reported by the bios.
> For example, if the __HID reported by the bios belongs to
> acpi_pnp_device_ids[], adev->physical_node_list has no devices.
> So in acpi_device_create_direct_mappings(), I added the case
> that adev->physical_node_list is empty.
Got you. Thanks!
Have you ever tried to have probe_acpi_namespace_devices() handle the case of
empty adev->physical_node_list at the same time?
Best regards,
baolu
>
>
> Best regards
> Felix cui
>
>
>
>
> -----邮件原件-----
> 发件人: Lu Baolu <baolu...@linux.intel.com>
> 发送时间: 2020年8月6日 10:36
> 收件人: FelixCui-oc <felixcui...@zhaoxin.com>; Joerg Roedel
> <j...@8bytes.org>; io...@lists.linux-foundation.org;
> linux-kernel@vger.kernel.org; David Woodhouse <dw...@infradead.org>
> 抄送: baolu...@linux.intel.com; RaymondPang-oc
> <raymondpang...@zhaoxin.com>; CobeChen-oc <cobechen...@zhaoxin.com>
> 主题: Re: 答复: 答复: 答复: 答复: 答复: [PATCH] iommu/vt-d:Add support for ACPI
> device in RMRR
>
> Hi Felix,
>
> On 8/5/20 3:37 PM, FelixCui-oc wrote:
>> Hi baolu,
>> Let me talk about why acpi_device_create_direct_mappings() is
>> needed and please tell me if there is an error.
>
> Sure. Before that, let me sync my understanding with you. You have an acpi
> namespace device in ANDD table, it also shows up in the device scope of a
> RMRR. Current code doesn't enumerate that device for the RMRR, hence
> iommu_create_device_direct_mappings() doesn't work for this device.
>
> At the same time, probe_acpi_namespace_devices() doesn't work for this
> device, hence you want to add a home-made
> acpi_device_create_direct_mappings() helper.
>
> Did I get it right?
>
>> In the probe_acpi_namespace_devices() function, only the device
>> in the addev->physical_node_list is probed,
>> but we need to establish identity mapping for the namespace
>> device in RMRR. These are two different devices.
>
> The namespace device has been probed and put in one drhd's device list.
> Hence, it should be processed by probe_acpi_namespace_devices(). So the
> question is why there are no devices in addev->physical_node_list?
>
>> Therefore, the namespace device in RMRR is not mapped in
>> probe_acpi_namespace_devices().
>> acpi_device_create_direct_mappings() is to create direct
>> mappings for namespace devices in RMRR.
>
> Best regards,
> baolu
>
