In case device is constrained by IOMMU or guest is running under AMD SEV, input/output buffers provided to device (DataBuffer and SenseData) needs to be explicitly mapped to device by PciIo->Map().
To avoid the overhead of mapping/unmapping the DataBuffer and SenseData to the device for every SCSI requst (And to simplify code), introduce a single DMA communication buffer that will be mapped to device on initialization. When a SCSI request needs to be sent to device, the DataBuffer and SenseData will be copied from/to the DMA communication buffer as required. This will be done by the following commits. Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2567 Reviewed-by: Nikita Leshenko <nikita.leshche...@oracle.com> Signed-off-by: Liran Alon <liran.a...@oracle.com> --- OvmfPkg/PvScsiDxe/PvScsi.c | 24 ++++++++++++++++++++++++ OvmfPkg/PvScsiDxe/PvScsi.h | 10 ++++++++++ 2 files changed, 34 insertions(+) diff --git a/OvmfPkg/PvScsiDxe/PvScsi.c b/OvmfPkg/PvScsiDxe/PvScsi.c index c3f5d38f3d30..e48929bf044c 100644 --- a/OvmfPkg/PvScsiDxe/PvScsi.c +++ b/OvmfPkg/PvScsiDxe/PvScsi.c @@ -638,6 +638,20 @@ PvScsiInit ( return Status; } + // + // Allocate DMA communication buffer + // + Status = PvScsiAllocateSharedPages ( + Dev, + EFI_SIZE_TO_PAGES (sizeof (*Dev->DmaBuf)), + EfiPciIoOperationBusMasterCommonBuffer, + (VOID **)&Dev->DmaBuf, + &Dev->DmaBufDmaDesc + ); + if (EFI_ERROR (Status)) { + return Status; + } + // // Populate the exported interface's attributes // @@ -676,6 +690,16 @@ PvScsiUninit ( IN OUT PVSCSI_DEV *Dev ) { + // + // Free DMA communication buffer + // + PvScsiFreeSharedPages ( + Dev, + EFI_SIZE_TO_PAGES (sizeof (*Dev->DmaBuf)), + (VOID **)&Dev->DmaBuf, + &Dev->DmaBufDmaDesc + ); + // // Free PVSCSI rings // diff --git a/OvmfPkg/PvScsiDxe/PvScsi.h b/OvmfPkg/PvScsiDxe/PvScsi.h index 6d23b6e1eccf..7f91d70fec79 100644 --- a/OvmfPkg/PvScsiDxe/PvScsi.h +++ b/OvmfPkg/PvScsiDxe/PvScsi.h @@ -31,6 +31,11 @@ typedef struct { PVSCSI_DMA_DESC RingCmpsDmaDesc; } PVSCSI_RING_DESC; +typedef struct { + UINT8 SenseData[MAX_UINT8]; + UINT8 Data[0x2000]; +} PVSCSI_DMA_BUFFER; + #define PVSCSI_SIG SIGNATURE_32 ('P', 'S', 'C', 'S') typedef struct { @@ -38,6 +43,8 @@ typedef struct { EFI_PCI_IO_PROTOCOL *PciIo; UINT64 OriginalPciAttributes; PVSCSI_RING_DESC RingDesc; + PVSCSI_DMA_BUFFER *DmaBuf; + PVSCSI_DMA_DESC DmaBufDmaDesc; UINT8 MaxTarget; UINT8 MaxLun; EFI_EXT_SCSI_PASS_THRU_PROTOCOL PassThru; @@ -47,4 +54,7 @@ typedef struct { #define PVSCSI_FROM_PASS_THRU(PassThruPointer) \ CR (PassThruPointer, PVSCSI_DEV, PassThru, PVSCSI_SIG) +#define PVSCSI_DMA_BUF_DEV_ADDR(Dev, MemberName) \ + (Dev->DmaBufDmaDesc.DeviceAddress + OFFSET_OF(PVSCSI_DMA_BUFFER, MemberName)) + #endif // __PVSCSI_DXE_H_ -- 2.20.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#55884): https://edk2.groups.io/g/devel/message/55884 Mute This Topic: https://groups.io/mt/72001286/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
