7efce2e59c
Implement EXT_SCSI_PASS_THRU.GetNextTarget() and EXT_SCSI_PASS_THRU.GetNextTargetLun(). ScsiBusDxe scans all MaxTarget * MaxLun possible devices. This can take unnecessarily long for large number of targets. To deal with this, VirtioScsiDxe has defined PCDs to limit the MaxTarget & MaxLun to desired values which gives sufficient performance. It is very important in virtio-scsi as it can have very big MaxTarget & MaxLun. Even though a common PVSCSI device has a default MaxTarget=64 and MaxLun=0, we implement similar mechanism as virtio-scsi for completeness. This may be useful in the future when PVSCSI will have bigger values for MaxTarget and MaxLun. Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2567 Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Message-Id: <20200328200100.60786-7-liran.alon@oracle.com> Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
43 lines
1021 B
INI
43 lines
1021 B
INI
## @file
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#
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# This driver produces Extended SCSI Pass Thru Protocol instances for
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# pvscsi devices.
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#
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# Copyright (C) 2020, Oracle and/or its affiliates.
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#
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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#
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##
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[Defines]
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INF_VERSION = 1.29
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BASE_NAME = PvScsiDxe
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FILE_GUID = 30346B14-1580-4781-879D-BA0C55AE9BB2
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MODULE_TYPE = UEFI_DRIVER
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VERSION_STRING = 1.0
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ENTRY_POINT = PvScsiEntryPoint
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[Sources]
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PvScsi.c
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PvScsi.h
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[Packages]
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MdePkg/MdePkg.dec
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OvmfPkg/OvmfPkg.dec
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[LibraryClasses]
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BaseMemoryLib
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DebugLib
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MemoryAllocationLib
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UefiBootServicesTableLib
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UefiDriverEntryPoint
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UefiLib
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[Protocols]
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gEfiExtScsiPassThruProtocolGuid ## BY_START
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gEfiPciIoProtocolGuid ## TO_START
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[Pcd]
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gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxLunLimit ## CONSUMES
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gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxTargetLimit ## CONSUMES
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