Re: [PATCH 1/2] MdeModulePkg/UefiBootManagerLib: log reserved mem allocation failure

["Ni, Ray" <ray.ni@intel.com>]

+ Siyuan who originally worked in the HTTP boot functionality.

> -----Original Message-----
> From: Laszlo Ersek <lersek@redhat.com>
> Sent: Thursday, January 9, 2020 7:43 AM
> To: edk2-devel-groups-io <devel@edk2.groups.io>
> Cc: Wu, Hao A <hao.a.wu@intel.com>; Wang, Jian J <jian.j.wang@intel.com>;
> Ni, Ray <ray.ni@intel.com>; Gao, Zhichao <zhichao.gao@intel.com>
> Subject: [PATCH 1/2] MdeModulePkg/UefiBootManagerLib: log reserved
> mem allocation failure
> 
> The LoadFile protocol can report such a large buffer size that we cannot
> allocate enough reserved pages for. This particularly affects HTTP(S)
> Boot, if the remote file is very large (for example, an ISO image).
> 
> While the TianoCore wiki mentions this at
> <https://github.com/tianocore/tianocore.github.io/wiki/HTTP-Boot#ram-
> disk-image-size>:
> 
> > The maximum RAM disk image size depends on how much continuous
> reserved
> > memory block the platform could provide.
> 
> it's hard to remember; so log a DEBUG_ERROR message when the allocation
> fails.
> 
> This patch produces error messages such as:
> 
> > UiApp:BmExpandLoadFile: failed to allocate reserved pages:
> > BufferSize=4501536768
> > LoadFile="PciRoot(0x0)/Pci(0x3,0x0)/MAC(5254001B103E,0x1)/
> >      IPv4(0.0.0.0,TCP,DHCP,192.168.124.106,192.168.124.1,255.255.255.0)/
> >      Dns(192.168.124.1)/
> >      Uri(https://ipv4-server/RHEL-7.7-20190723.1-Server-x86_64-dvd1.iso)"
> > FilePath=""
> 
> (Manually rewrapped here for keeping PatchCheck.py happy.)
> 
> Cc: Hao A Wu <hao.a.wu@intel.com>
> Cc: Jian J Wang <jian.j.wang@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Zhichao Gao <zhichao.gao@intel.com>
> Signed-off-by: Laszlo Ersek <lersek@redhat.com>
> ---
>  MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c | 31
> ++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> index 62c5b2dc94ab..540d169ec1a6 100644
> --- a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> +++ b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> @@ -1387,6 +1387,37 @@ BmExpandLoadFile (
>    //
>    FileBuffer = AllocateReservedPages (EFI_SIZE_TO_PAGES (BufferSize));
>    if (FileBuffer == NULL) {
> +    DEBUG_CODE (
> +      EFI_DEVICE_PATH *LoadFilePath;
> +      CHAR16          *LoadFileText;
> +      CHAR16          *FileText;
> +
> +      LoadFilePath = DevicePathFromHandle (LoadFileHandle);
> +      if (LoadFilePath == NULL) {
> +        LoadFileText = NULL;
> +      } else {
> +        LoadFileText = ConvertDevicePathToText (LoadFilePath, FALSE, FALSE);
> +      }
> +      FileText = ConvertDevicePathToText (FilePath, FALSE, FALSE);
> +
> +      DEBUG ((
> +        DEBUG_ERROR,
> +        "%a:%a: failed to allocate reserved pages: "
> +        "BufferSize=%Lu LoadFile=\"%s\" FilePath=\"%s\"\n",
> +        gEfiCallerBaseName,
> +        __FUNCTION__,
> +        (UINT64)BufferSize,
> +        LoadFileText,
> +        FileText
> +        ));
> +
> +      if (FileText != NULL) {
> +        FreePool (FileText);
> +      }
> +      if (LoadFileText != NULL) {
> +        FreePool (LoadFileText);
> +      }
> +      );
>      return NULL;
>    }
> 
> --
> 2.19.1.3.g30247aa5d201
>