Laszlo, Our QA found Win10 S4 resume fails due to your change. As you might notice that I just rolled back the BM disabling patches in PciBus module, I am thinking about maybe you need to rollback the whole ExitBootServices callback as well to fix the compatibility issue.
Thanks/Ray > -----Original Message----- > From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of > Laszlo Ersek > Sent: Saturday, October 28, 2017 12:10 AM > To: edk2-devel-01 <edk2-devel@lists.01.org> > Cc: Ard Biesheuvel <ard.biesheu...@linaro.org>; Dong, Eric > <eric.d...@intel.com>; Zeng, Star <star.z...@intel.com>; Dann Frazier > <da...@ubuntu.com> > Subject: Re: [edk2] [PATCH] MdeModulePkg/AtaAtapiPassThru: disable only > BM-DMA at ExitBootServices() > > On 10/26/17 17:48, Laszlo Ersek wrote: > > Clearing I/O port decoding in the PCI command register at > > ExitBootServices() breaks IDE boot in Windows, on QEMU's "pc" (i440fx) > > machine type. (AHCI boot on "q35" is unaffected.) Windows seems > > repeatedly stuck, apparently waiting for a timeout of sorts. > > > > This is arguably a Windows bug; a native OS driver should not expect > > the firmware to leave the PCI command register in any particular state. > > > > Strictly speaking, we only need to disable BM-DMA at > > ExitBootServices(), in order to abort pending transfers to/from RAM, > > which is soon to be owned by the OS. BM-DMA is also the only bit > > that's explicitly named by the UEFI Driver Writers' Guide, for clearing at > ExitBootServices(). > > > > I've verified that clearing only BM-DMA fixes the isse (boot time) on > > i440fx, and does not regress q35/AHCI. > > > > Cc: Aleksei Kovura <alex3...@zoho.com> > > Cc: Ard Biesheuvel <ard.biesheu...@linaro.org> > > Cc: Dann Frazier <da...@ubuntu.com> > > Cc: Eric Dong <eric.d...@intel.com> > > Cc: Star Zeng <star.z...@intel.com> > > Reported-by: Aleksei Kovura <alex3...@zoho.com> > > Reported-by: Dann Frazier <da...@ubuntu.com> > > Reported-by: https://launchpad.net/~cjkrupp > > Bisected-by: Dann Frazier <da...@ubuntu.com> > > Bisected-by: https://launchpad.net/~cjkrupp > > Suggested-by: Ard Biesheuvel <ard.biesheu...@linaro.org> > > Suggested-by: Star Zeng <star.z...@intel.com> > > Ref: https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/1725560 > > Fixes: 6fb8ddd36bde45614b0a069528cdc97077835a74 > > Contributed-under: TianoCore Contribution Agreement 1.1 > > Signed-off-by: Laszlo Ersek <ler...@redhat.com> > > --- > > > > Notes: > > Repo: https://github.com/lersek/edk2.git > > Branch: ata_disable_only_bmdma > > > > MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.h | 3 +-- > > MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.c | 5 ++--- > > 2 files changed, 3 insertions(+), 5 deletions(-) > > > > diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.h > > b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.h > > index 8d6eac706c0b..92c5bf2001cd 100644 > > --- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.h > > +++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.h > > @@ -123,8 +123,7 @@ typedef struct { > > LIST_ENTRY NonBlockingTaskList; > > > > // > > - // For disabling the device (especially Bus Master DMA) at > > - // ExitBootServices(). > > + // For disabling Bus Master DMA on the device at ExitBootServices(). > > // > > EFI_EVENT ExitBootEvent; > > } ATA_ATAPI_PASS_THRU_INSTANCE; > > diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.c > > b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.c > > index 09064dda18b7..e10e0d4e65f6 100644 > > --- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.c > > +++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.c > > @@ -480,8 +480,7 @@ InitializeAtaAtapiPassThru ( } > > > > /** > > - Disable the device (especially Bus Master DMA) when exiting the > > boot > > - services. > > + Disable Bus Master DMA on the device when exiting the boot services. > > > > @param[in] Event Event for which this notification function is being > > called. > > @@ -506,7 +505,7 @@ AtaPassThruExitBootServices ( > > PciIo->Attributes ( > > PciIo, > > EfiPciIoAttributeOperationDisable, > > - Instance->EnabledPciAttributes, > > + Instance->EnabledPciAttributes & > > + EFI_PCI_IO_ATTRIBUTE_BUS_MASTER, > > NULL > > ); > > } > > > > Thanks Everyone for the feedback; I fixed the typo pointed out by Star and > pushed the patch as commit 76fd5a660d70. > > Cheers > Laszlo > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
