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MdeModulePkg/AtaAtapiPassThru: disable only BM-DMA at ExitBootServices()

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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 issue (boot time) on
i440fx, and does not regress q35/AHCI.

Cc: Aleksei Kovura <alex3kov@zoho.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Dann Frazier <dannf@ubuntu.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Reported-by: Aleksei Kovura <alex3kov@zoho.com>
Reported-by: Dann Frazier <dannf@ubuntu.com>
Reported-by: https://launchpad.net/~cjkrupp
Bisected-by: Dann Frazier <dannf@ubuntu.com>
Bisected-by: https://launchpad.net/~cjkrupp
Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Suggested-by: Star Zeng <star.zeng@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 <lersek@redhat.com>
Tested-by: dann frazier <dann.frazier@canonical.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Tested-by: Aleksei Kovura <alex3kov@zoho.com>
This commit is contained in:
Laszlo Ersek 2017-10-26 15:48:31 +02:00
parent bca18551f6
commit 76fd5a660d
2 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.c
View File

@ -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
);
}

3
MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AtaAtapiPassThru.h
View File

@ -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;