Re: [edk2-devel] [PATCH] MdeModulePkg/UsbBusDxe: On reset rebuild descriptor table

["Guomin Jiang" <guomin.jiang@intel.com>]

Hi Jeremy,

You can refer https://edk2.groups.io/g/devel/message/58125 for discussion about this solution.

Two issue I found:
1. Memory leakage may occur if doing so and I am investigating it.
2. It test pass with OVMF but fail in real platform, and I am figuring out the flow.

Best Regards
Guomin

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Jeremy
> Linton
> Sent: Tuesday, April 28, 2020 6:16 AM
> To: devel@edk2.groups.io
> Cc: Wu, Hao A <hao.a.wu@intel.com>; Ni, Ray <ray.ni@intel.com>; Kinney,
> Michael D <michael.d.kinney@intel.com>; Tian, Feng <feng.tian@intel.com>;
> Wang, Jian J <jian.j.wang@intel.com>; ard.biesheuvel@arm.com; Jeremy
> Linton <jeremy.linton@arm.com>
> Subject: [edk2-devel] [PATCH] MdeModulePkg/UsbBusDxe: On reset rebuild
> descriptor table
> 
> During port reset, the device descriptors should be checked
> before attempting to set an endpoint configuration.
> 
> In particular this fixes a crash due to
> ASSERT(TrsRing != NULL) in XhcSyncTrsRing(). That crash
> happens during error recovery on devices attached to XHCI
> hosts. This is because the port disable clears and deallocats
> all the EP data structures. When the port is reconfigured
> without first requesting the EP descriptors,
> XhcSetConfigCmd[64]() is not being called because the
> NumConfigurations remains 0.
> 
> We could attempt to rebuild the EP descriptions directly
> from the XHCI driver. OTOH, its probably good practice to
> assure the device description is what we expect from within
> the core USB subsystem during reset.
> 
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
> ---
>  MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBus.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBus.c
> b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBus.c
> index 4b4915c019..17bb691bf8 100644
> --- a/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBus.c
> +++ b/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBus.c
> @@ -874,6 +874,14 @@ UsbIoPortReset (
>    // is in CONFIGURED state.
> 
>    //
> 
>    if (Dev->ActiveConfig != NULL) {
> 
> +    Status = UsbBuildDescTable (Dev);
> 
> +
> 
> +    if (EFI_ERROR (Status)) {
> 
> +      DEBUG ((EFI_D_ERROR, "UsbIoPortReset: failed to build descriptor table
> for %d - %r\n",
> 
> +                 Dev->Address, Status));
> 
> +      goto ON_EXIT;
> 
> +    }
> 
> +
> 
>      Status = UsbSetConfig (Dev, Dev->ActiveConfig->Desc.ConfigurationValue);
> 
> 
> 
>      if (EFI_ERROR (Status)) {
> 
> --
> 2.24.1
> 
> 
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