mirror of https://github.com/acidanthera/audk.git
MdeModulePkg/ScsiBusDxe: don't produce ScsiIo for nonexistent LUNs, part 2
The SPC-4 says about INQUIRY, > In response to an INQUIRY command received by an incorrect logical unit, > the SCSI target device shall return the INQUIRY data with the peripheral > qualifier set to the value defined in 6.4.2. The INQUIRY command shall > return CHECK CONDITION status only when the device server is unable to > return the requested INQUIRY data. When a device server takes the second branch, and returns CHECK CONDITION for a nonexistent LUN, the InquiryData structure in the DiscoverScsiDevice() function remains filled with the original zeros. DiscoverScsiDevice() then sees zero in both Peripheral_Qualifier and Peripheral_Type, and therefore ScsiBusDxe produces a ScsiIo protocol instance with device type zero, for the nonexistent LUN. Device type zero is EFI_SCSI_TYPE_DISK. Thus ScsiDiskDxe binds the bogus ScsiIo protocol interface, and produces a similarly bogus BlockIo interface on top. This ripples up to BDS, where UefiBootManagerLib can auto-generate bogus UEFI boot options for the nonexistent LUNs. This has been encountered with QEMU, after commit ded6ddc5a7b9 ("scsi: clarify sense codes for LUN0 emulation", 2017-08-04). QEMU now answers INQUIRY commands that were directed to nonexistent LUNs with: > DiscoverScsiDevice:1361: Lun=2 HostAdapterStatus=0 TargetStatus=2 > SenseDataLength=18 InquiryDataLength=96 > Sense { > Sense 000000 70 00 05 00 00 00 00 0A 00 00 00 00 25 00 00 00 > Sense 000010 00 00 > Sense } > Inquiry { > Inquiry 000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > Inquiry 000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > Inquiry 000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > Inquiry 000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > Inquiry 000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > Inquiry 000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > Inquiry } The interesting fields are: - HostAdapterStatus=0 (OK), - TargetStatus=2 (CHECK CONDITION), - Sense/Error_Code=0x70 (Current error, Fixed description) - Sense/Sense_Key=0x05 (ILLEGAL REQUEST) According to SPC-4 "Table 41 -- Sense key descriptions (part 2 of 2)", ILLEGAL REQUEST is justified when "the command was addressed to an incorrect logical unit number". Thus, recognize this kind of answer for nonexistent LUNs. ( Checking the status fields and the sense data is justified anyway, according to the documentation of ScsiInquiryCommand(): > @retval EFI_SUCCESS The command was executed > successfully. See > HostAdapterStatus, > TargetStatus, SenseDataLength, > and SenseData in that order for > additional status information. ) Cc: Eric Dong <eric.dong@intel.com> Cc: Feng Tian <feng.tian@intel.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Star Zeng <star.zeng@intel.com>
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c09e481bbb
commit
ce13d2d8c8
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@ -1298,12 +1298,14 @@ DiscoverScsiDevice (
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UINT8 HostAdapterStatus;
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UINT8 TargetStatus;
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EFI_SCSI_INQUIRY_DATA *InquiryData;
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EFI_SCSI_SENSE_DATA *SenseData;
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UINT8 MaxRetry;
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UINT8 Index;
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BOOLEAN ScsiDeviceFound;
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HostAdapterStatus = 0;
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TargetStatus = 0;
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SenseData = NULL;
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InquiryData = AllocateAlignedBuffer (ScsiIoDevice, sizeof (EFI_SCSI_INQUIRY_DATA));
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if (InquiryData == NULL) {
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@ -1311,19 +1313,29 @@ DiscoverScsiDevice (
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goto Done;
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}
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SenseData = AllocateAlignedBuffer (
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ScsiIoDevice,
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sizeof (EFI_SCSI_SENSE_DATA)
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);
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if (SenseData == NULL) {
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ScsiDeviceFound = FALSE;
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goto Done;
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}
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//
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// Using Inquiry command to scan for the device
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//
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InquiryDataLength = sizeof (EFI_SCSI_INQUIRY_DATA);
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SenseDataLength = 0;
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SenseDataLength = sizeof (EFI_SCSI_SENSE_DATA);
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ZeroMem (InquiryData, InquiryDataLength);
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ZeroMem (SenseData, SenseDataLength);
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MaxRetry = 2;
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for (Index = 0; Index < MaxRetry; Index++) {
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Status = ScsiInquiryCommand (
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&ScsiIoDevice->ScsiIo,
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SCSI_BUS_TIMEOUT,
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NULL,
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SenseData,
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&SenseDataLength,
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&HostAdapterStatus,
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&TargetStatus,
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@ -1332,6 +1344,13 @@ DiscoverScsiDevice (
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FALSE
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);
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if (!EFI_ERROR (Status)) {
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if ((HostAdapterStatus == EFI_SCSI_IO_STATUS_HOST_ADAPTER_OK) &&
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(TargetStatus == EFI_SCSI_IO_STATUS_TARGET_CHECK_CONDITION) &&
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(SenseData->Error_Code == 0x70) &&
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(SenseData->Sense_Key == EFI_SCSI_SK_ILLEGAL_REQUEST)) {
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ScsiDeviceFound = FALSE;
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goto Done;
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}
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break;
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}
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if ((Status == EFI_BAD_BUFFER_SIZE) ||
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@ -1377,6 +1396,7 @@ DiscoverScsiDevice (
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ScsiDeviceFound = TRUE;
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Done:
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FreeAlignedBuffer (SenseData, sizeof (EFI_SCSI_SENSE_DATA));
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FreeAlignedBuffer (InquiryData, sizeof (EFI_SCSI_INQUIRY_DATA));
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return ScsiDeviceFound;
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