[edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[Hsueh, Hong-Chih (Neo) via groups.io]

A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions require PciHotPlugRequestNotify to add a root bridge or remove a root bridge completely.
In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with no-action on second plug because bridge tree shows configured.
Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event to fix this issue.

Cc: Feng Ding <feng1.ding@amd.com>
Cc: Jiangang He <jiangang.he@amd.com>
Signed-off-by: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
---
 MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
index 3f8c6e6da7..2b7af60e0a 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
@@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
       }
     }
 
+    DestroyPciDeviceTree (Bridge);
+
     //
     // End for
     //
-- 
2.40.0.windows.1



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Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[Laszlo Ersek]

On 2/6/24 23:34, Hsueh, Hong-Chih (Neo) via groups.io wrote:
> A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions require PciHotPlugRequestNotify to add a root bridge or remove a root bridge completely.
> In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with no-action on second plug because bridge tree shows configured.
> Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event to fix this issue.
> 
> Cc: Feng Ding <feng1.ding@amd.com>
> Cc: Jiangang He <jiangang.he@amd.com>
> Signed-off-by: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
> ---
>  MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> index 3f8c6e6da7..2b7af60e0a 100644
> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> @@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
>        }
>      }
>  
> +    DestroyPciDeviceTree (Bridge);
> +
>      //
>      // End for
>      //

I think the subject line is too specific. This patch appears to fix a general resource leak in the PCI hot-unplug functionality. Writing up the USB4 angle in the commit message is welcome in my opinion, but the subject should state something like:

MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

(And I think the bridge doesn't even have to be a *root* bridge for the leak to occur; is that right?)

Laszlo



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Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[Ding, Feng (Sunnyvale) via groups.io]

[AMD Official Use Only - General]

Hi Laszlo,

" MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug " is perfect description for the issue.
"a root bridge" is "a (PCIe Hotplug) bridge", locating anywhere.

Thanks
feng

-----Original Message-----
From: Laszlo Ersek <lersek@redhat.com>
Sent: Wednesday, February 7, 2024 12:51 PM
To: devel@edk2.groups.io; Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
Cc: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>; He, Jiangang <Jiangang.He@amd.com>; Chang, Abner <Abner.Chang@amd.com>; ray.ni@intel.com; gaoliming@byosoft.com.cn
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.


On 2/6/24 23:34, Hsueh, Hong-Chih (Neo) via groups.io wrote:
> A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions require PciHotPlugRequestNotify to add a root bridge or remove a root bridge completely.
> In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with no-action on second plug because bridge tree shows configured.
> Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event to fix this issue.
>
> Cc: Feng Ding <feng1.ding@amd.com>
> Cc: Jiangang He <jiangang.he@amd.com>
> Signed-off-by: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
> ---
>  MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> index 3f8c6e6da7..2b7af60e0a 100644
> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> @@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
>        }
>      }
>
> +    DestroyPciDeviceTree (Bridge);
> +
>      //
>      // End for
>      //

I think the subject line is too specific. This patch appears to fix a general resource leak in the PCI hot-unplug functionality. Writing up the USB4 angle in the commit message is welcome in my opinion, but the subject should state something like:

MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

(And I think the bridge doesn't even have to be a *root* bridge for the leak to occur; is that right?)

Laszlo



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Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

[Hsueh, Hong-Chih (Neo) via groups.io]

[-- Attachment #1.1: Type: text/plain, Size: 3671 bytes --]

[AMD Official Use Only - General]

Hi Feng & Laszlo,

Thank you for the feedback, I have changed the title of this email and the title of the commit message of this patch.
The new patch as attached. If this patch looks good to you, could you please help to add reviewed-by?

Thanks!

Regards,
Neo

________________________________
From: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>
Sent: Thursday, February 8, 2024 5:09 PM
To: Laszlo Ersek <lersek@redhat.com>; devel@edk2.groups.io <devel@edk2.groups.io>; Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
Cc: He, Jiangang <Jiangang.He@amd.com>; Chang, Abner <Abner.Chang@amd.com>; ray.ni@intel.com <ray.ni@intel.com>; gaoliming@byosoft.com.cn <gaoliming@byosoft.com.cn>; Gopal, Pradeep <Pradeep.Gopal@amd.com>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[AMD Official Use Only - General]

Hi Laszlo,

" MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug " is perfect description for the issue.
"a root bridge" is "a (PCIe Hotplug) bridge", locating anywhere.

Thanks
feng

-----Original Message-----
From: Laszlo Ersek <lersek@redhat.com>
Sent: Wednesday, February 7, 2024 12:51 PM
To: devel@edk2.groups.io; Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
Cc: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>; He, Jiangang <Jiangang.He@amd.com>; Chang, Abner <Abner.Chang@amd.com>; ray.ni@intel.com; gaoliming@byosoft.com.cn
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.


On 2/6/24 23:34, Hsueh, Hong-Chih (Neo) via groups.io wrote:
> A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions require PciHotPlugRequestNotify to add a root bridge or remove a root bridge completely.
> In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with no-action on second plug because bridge tree shows configured.
> Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event to fix this issue.
>
> Cc: Feng Ding <feng1.ding@amd.com>
> Cc: Jiangang He <jiangang.he@amd.com>
> Signed-off-by: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
> ---
>  MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> index 3f8c6e6da7..2b7af60e0a 100644
> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> @@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
>        }
>      }
>
> +    DestroyPciDeviceTree (Bridge);
> +
>      //
>      // End for
>      //

I think the subject line is too specific. This patch appears to fix a general resource leak in the PCI hot-unplug functionality. Writing up the USB4 angle in the commit message is welcome in my opinion, but the subject should state something like:

MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

(And I think the bridge doesn't even have to be a *root* bridge for the leak to occur; is that right?)

Laszlo



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[-- Attachment #1.2: Type: text/html, Size: 7182 bytes --]

[-- Attachment #2: 0001-MdeModulePkg-PciBusDxe-plug-device-hierarchy-leak-up.patch --]
[-- Type: application/octet-stream, Size: 1370 bytes --]

From 3a640aa0f5555ccc327588ef7bb8d4ba5941442d Mon Sep 17 00:00:00 2001
Message-Id: <3a640aa0f5555ccc327588ef7bb8d4ba5941442d.1708458402.git.Hong-Chih.Hsueh@amd.com>
From: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
Date: Tue, 6 Feb 2024 16:12:34 -0600
Subject: [PATCH] MdeModulePkg/PciBusDxe: plug device hierarchy leak upon
 bridge hot-unplug

A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions require PciHotPlugRequestNotify to add a root bridge or remove a root bridge completely.
In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with no-action on second plug because bridge tree shows configured.
Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event to fix this issue.

Cc: Feng Ding <feng1.ding@amd.com>
Cc: Jiangang He <jiangang.he@amd.com>
Signed-off-by: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
---
 MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
index 3f8c6e6da7..2b7af60e0a 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
@@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
       }
     }
 
+    DestroyPciDeviceTree (Bridge);
+
     //
     // End for
     //
-- 
2.40.0.windows.1

Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

[Laszlo Ersek]

On 2/20/24 20:48, Hsueh, Hong-Chih (Neo) wrote:
> [AMD Official Use Only - General]
> 
> 
> Hi Feng & Laszlo,
> 
> Thank you for the feedback, I have changed the title of this email and
> the title of the commit message of this patch.
> The new patch as attached. If this patch looks good to you, could you
> please help to add reviewed-by?

Please post the patch (with "v2" in the subject prefix) to the mailing
list, as a standalone thread-starter.

Thanks,
Laszlo


> 
> Thanks!
> 
> Regards,
> Neo
> 
> ------------------------------------------------------------------------
> *From:* Ding, Feng (Sunnyvale) <feng1.ding@amd.com>
> *Sent:* Thursday, February 8, 2024 5:09 PM
> *To:* Laszlo Ersek <lersek@redhat.com>; devel@edk2.groups.io
> <devel@edk2.groups.io>; Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
> *Cc:* He, Jiangang <Jiangang.He@amd.com>; Chang, Abner
> <Abner.Chang@amd.com>; ray.ni@intel.com <ray.ni@intel.com>;
> gaoliming@byosoft.com.cn <gaoliming@byosoft.com.cn>; Gopal, Pradeep
> <Pradeep.Gopal@amd.com>
> *Subject:* RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug
> functionality for USB4 bridge
>  
> [AMD Official Use Only - General]
> 
> Hi Laszlo,
> 
> " MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge
> hot-unplug " is perfect description for the issue.
> "a root bridge" is "a (PCIe Hotplug) bridge", locating anywhere.
> 
> Thanks
> feng
> 
> -----Original Message-----
> From: Laszlo Ersek <lersek@redhat.com>
> Sent: Wednesday, February 7, 2024 12:51 PM
> To: devel@edk2.groups.io; Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
> Cc: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>; He, Jiangang
> <Jiangang.He@amd.com>; Chang, Abner <Abner.Chang@amd.com>;
> ray.ni@intel.com; gaoliming@byosoft.com.cn
> Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug
> functionality for USB4 bridge
> 
> Caution: This message originated from an External Source. Use proper
> caution when opening attachments, clicking links, or responding.
> 
> 
> On 2/6/24 23:34, Hsueh, Hong-Chih (Neo) via groups.io wrote:
>> A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions require PciHotPlugRequestNotify to add a root bridge or remove a root bridge completely.
>> In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with no-action on second plug because bridge tree shows configured.
>> Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event to fix this issue.
>>
>> Cc: Feng Ding <feng1.ding@amd.com>
>> Cc: Jiangang He <jiangang.he@amd.com>
>> Signed-off-by: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
>> ---
>>  MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
>> index 3f8c6e6da7..2b7af60e0a 100644
>> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
>> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
>> @@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
>>        }
>>      }
>>
>> +    DestroyPciDeviceTree (Bridge);
>> +
>>      //
>>      // End for
>>      //
> 
> I think the subject line is too specific. This patch appears to fix a
> general resource leak in the PCI hot-unplug functionality. Writing up
> the USB4 angle in the commit message is welcome in my opinion, but the
> subject should state something like:
> 
> MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug
> 
> (And I think the bridge doesn't even have to be a *root* bridge for the
> leak to occur; is that right?)
> 
> Laszlo
> 



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Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

[Hsueh, Hong-Chih (Neo) via groups.io]

[-- Attachment #1: Type: text/plain, Size: 4414 bytes --]

[AMD Official Use Only - General]

Please kindly ignore this mail thread as I have created and sent out [PATCH V2] with correct title in another mail thread for review.

Thank you.

Regards,
Neo
________________________________
From: Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
Sent: Tuesday, February 20, 2024 1:48 PM
To: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>; Laszlo Ersek <lersek@redhat.com>; devel@edk2.groups.io <devel@edk2.groups.io>
Cc: He, Jiangang <Jiangang.He@amd.com>; Chang, Abner <Abner.Chang@amd.com>; ray.ni@intel.com <ray.ni@intel.com>; gaoliming@byosoft.com.cn <gaoliming@byosoft.com.cn>; Gopal, Pradeep <Pradeep.Gopal@amd.com>
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

Hi Feng & Laszlo,

Thank you for the feedback, I have changed the title of this email and the title of the commit message of this patch.
The new patch as attached. If this patch looks good to you, could you please help to add reviewed-by?

Thanks!

Regards,
Neo

________________________________
From: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>
Sent: Thursday, February 8, 2024 5:09 PM
To: Laszlo Ersek <lersek@redhat.com>; devel@edk2.groups.io <devel@edk2.groups.io>; Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
Cc: He, Jiangang <Jiangang.He@amd.com>; Chang, Abner <Abner.Chang@amd.com>; ray.ni@intel.com <ray.ni@intel.com>; gaoliming@byosoft.com.cn <gaoliming@byosoft.com.cn>; Gopal, Pradeep <Pradeep.Gopal@amd.com>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[AMD Official Use Only - General]

Hi Laszlo,

" MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug " is perfect description for the issue.
"a root bridge" is "a (PCIe Hotplug) bridge", locating anywhere.

Thanks
feng

-----Original Message-----
From: Laszlo Ersek <lersek@redhat.com>
Sent: Wednesday, February 7, 2024 12:51 PM
To: devel@edk2.groups.io; Hsueh, Hong-Chih (Neo) <Hong-Chih.Hsueh@amd.com>
Cc: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>; He, Jiangang <Jiangang.He@amd.com>; Chang, Abner <Abner.Chang@amd.com>; ray.ni@intel.com; gaoliming@byosoft.com.cn
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.


On 2/6/24 23:34, Hsueh, Hong-Chih (Neo) via groups.io wrote:
> A USB4 or TBT bridge can be plugged or unplugged on USB4 port. The actions require PciHotPlugRequestNotify to add a root bridge or remove a root bridge completely.
> In the plug-unplug-plug scenerio, PciHotPlugRequestNotify will return with no-action on second plug because bridge tree shows configured.
> Destroy Pci Device Tree in function PciHotPlugRequestNotify for unplug event to fix this issue.
>
> Cc: Feng Ding <feng1.ding@amd.com>
> Cc: Jiangang He <jiangang.he@amd.com>
> Signed-off-by: Neo Hsueh <Hong-Chih.Hsueh@amd.com>
> ---
>  MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> index 3f8c6e6da7..2b7af60e0a 100644
> --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumerator.c
> @@ -2103,6 +2103,8 @@ PciHotPlugRequestNotify (
>        }
>      }
>
> +    DestroyPciDeviceTree (Bridge);
> +
>      //
>      // End for
>      //

I think the subject line is too specific. This patch appears to fix a general resource leak in the PCI hot-unplug functionality. Writing up the USB4 angle in the commit message is welcome in my opinion, but the subject should state something like:

MdeModulePkg/PciBusDxe: plug device hierarchy leak upon bridge hot-unplug

(And I think the bridge doesn't even have to be a *root* bridge for the leak to occur; is that right?)

Laszlo



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Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[Yoshinoya]

[-- Attachment #1: Type: text/plain, Size: 531 bytes --]

Hi, Hsueh:
It seems pcie device's hot plug operation is rare during UEFI BIOS phase.

Does this patch aim to solve usb4 storage hot-plug during UEFI BIOS phase?


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Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

[Ni, Ray]

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I remember there was a patch to fix some resource leak issue and later we agreed it was a false alarm (no bug in PciBus drver).
I am not sure if this is the patch we discussed earlier.


Thanks,
Ray
________________________________
From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Yoshinoya <yoshinoyatoko@163.com>
Sent: Friday, August 16, 2024 10:33
To: Ding, Feng (Sunnyvale) <feng1.ding@amd.com>; devel@edk2.groups.io <devel@edk2.groups.io>
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Fix hotplug functionality for USB4 bridge

Hi, Hsueh:
It seems pcie device's hot plug operation is rare during UEFI BIOS phase.

Does this patch aim to solve usb4 storage hot-plug during UEFI BIOS phase?



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