Implement EXT_SCSI_PASS_THRU.PassThru(). Machines should be able to boot after this commit. Tested with Ubuntu 16.04 guest.
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2567 Signed-off-by: Liran Alon <liran.a...@oracle.com> --- OvmfPkg/OvmfPkg.dec | 6 + OvmfPkg/PvScsiDxe/PvScsi.c | 442 +++++++++++++++++++++++++++++++- OvmfPkg/PvScsiDxe/PvScsi.h | 1 + OvmfPkg/PvScsiDxe/PvScsiDxe.inf | 5 +- 4 files changed, 451 insertions(+), 3 deletions(-) diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec index a04aee5c2cd4..ff49ec0e9e6a 100644 --- a/OvmfPkg/OvmfPkg.dec +++ b/OvmfPkg/OvmfPkg.dec @@ -130,6 +130,12 @@ gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxTargetLimit|64|UINT8|0x36 gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxLunLimit|0|UINT8|0x37 + ## After PvScsiDxe sends a SCSI request to the device, it waits for + # the request completion in a polling loop. + # This constant defines how many micro-seconds to wait between each + # polling loop iteration. + gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiWaitForCmpStallInUsecs|5|UINT32|0x38 + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageEventLogBase|0x0|UINT32|0x8 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageEventLogSize|0x0|UINT32|0x9 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFirmwareFdSize|0x0|UINT32|0xa diff --git a/OvmfPkg/PvScsiDxe/PvScsi.c b/OvmfPkg/PvScsiDxe/PvScsi.c index 928984099520..de4122e39a81 100644 --- a/OvmfPkg/PvScsiDxe/PvScsi.c +++ b/OvmfPkg/PvScsiDxe/PvScsi.c @@ -31,6 +31,27 @@ // Ext SCSI Pass Thru utilities // +/** + Reads a 32-bit value into BAR0 using MMIO +**/ +STATIC +EFI_STATUS +PvScsiMmioRead32 ( + IN CONST PVSCSI_DEV *Dev, + IN UINT64 Offset, + OUT UINT32 *Value + ) +{ + return Dev->PciIo->Mem.Read ( + Dev->PciIo, + EfiPciIoWidthUint32, + PCI_BAR_IDX0, + Offset, + 1, // Count + Value + ); +} + /** Writes a 32-bit value into BAR0 using MMIO **/ @@ -109,6 +130,352 @@ PvScsiWriteCmdDesc ( return EFI_SUCCESS; } +/** + Returns if PVSCSI request ring is full +**/ +STATIC +BOOLEAN +PvScsiIsReqRingFull ( + IN CONST PVSCSI_DEV *Dev + ) +{ + PVSCSI_RINGS_STATE *RingsState; + UINT32 ReqNumEntries; + + RingsState = Dev->RingDesc.RingState; + ReqNumEntries = 1U << RingsState->ReqNumEntriesLog2; + return (RingsState->ReqProdIdx - RingsState->CmpConsIdx) >= ReqNumEntries; +} + +/** + Returns pointer to current request descriptor to produce +**/ +STATIC +PVSCSI_RING_REQ_DESC * +PvScsiGetCurrentRequest ( + IN CONST PVSCSI_DEV *Dev + ) +{ + PVSCSI_RINGS_STATE *RingState; + UINT32 ReqNumEntries; + + RingState = Dev->RingDesc.RingState; + ReqNumEntries = 1U << RingState->ReqNumEntriesLog2; + return Dev->RingDesc.RingReqs + + (RingState->ReqProdIdx & (ReqNumEntries - 1)); +} + +/** + Returns pointer to current completion descriptor to consume +**/ +STATIC +PVSCSI_RING_CMP_DESC * +PvScsiGetCurrentResponse ( + IN CONST PVSCSI_DEV *Dev + ) +{ + PVSCSI_RINGS_STATE *RingState; + UINT32 CmpNumEntries; + + RingState = Dev->RingDesc.RingState; + CmpNumEntries = 1U << RingState->CmpNumEntriesLog2; + return Dev->RingDesc.RingCmps + + (RingState->CmpConsIdx & (CmpNumEntries - 1)); +} + +/** + Wait for device to signal completion of submitted requests +**/ +STATIC +EFI_STATUS +PvScsiWaitForRequestCompletion ( + IN CONST PVSCSI_DEV *Dev + ) +{ + EFI_STATUS Status; + UINT32 IntrStatus; + + // + // Note: We don't yet support Timeout according to + // EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET.Timeout. + // + // This is consistent with some other Scsi PassThru drivers + // such as VirtioScsi. + // + for (;;) { + Status = PvScsiMmioRead32 (Dev, PvScsiRegOffsetIntrStatus, &IntrStatus); + if (EFI_ERROR (Status)) { + return Status; + } + + // + // PVSCSI_INTR_CMPL_MASK is set if device completed submitted requests + // + if ((IntrStatus & PVSCSI_INTR_CMPL_MASK) != 0) { + break; + } + + gBS->Stall (Dev->WaitForCmpStallInUsecs); + } + + // + // Acknowledge PVSCSI_INTR_CMPL_MASK in device interrupt-status register + // + return PvScsiMmioWrite32 ( + Dev, + PvScsiRegOffsetIntrStatus, + PVSCSI_INTR_CMPL_MASK + ); +} + +/** + Populate a PVSCSI request descriptor from the Extended SCSI Pass Thru + Protocol packet. +**/ +STATIC +EFI_STATUS +PopulateRequest ( + IN CONST PVSCSI_DEV *Dev, + IN UINT8 *Target, + IN UINT64 Lun, + IN OUT EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET *Packet, + OUT PVSCSI_RING_REQ_DESC *Request + ) +{ + UINT8 TargetValue; + + // + // We only use first byte of target identifer + // + TargetValue = *Target; + + // + // Check for unsupported requests + // + if ( + // + // Bidirectional transfer was requested + // + (Packet->InTransferLength > 0 && Packet->OutTransferLength > 0) || + (Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_BIDIRECTIONAL) || + // + // Command Descriptor Block bigger than this constant should be considered + // out-of-band. We currently don't support these CDBs. + // + (Packet->CdbLength > PVSCSI_CDB_MAX_SIZE) + ) { + + // + // This error code doesn't require updates to the Packet output fields + // + return EFI_UNSUPPORTED; + } + + // + // Check for invalid parameters + // + if ( + // + // Addressed invalid device + // + (TargetValue > Dev->MaxTarget) || (Lun > Dev->MaxLun) || + // + // Invalid direction (there doesn't seem to be a macro for the "no data + // transferred" "direction", eg. for TEST UNIT READY) + // + (Packet->DataDirection > EFI_EXT_SCSI_DATA_DIRECTION_BIDIRECTIONAL) || + // + // Trying to receive, but destination pointer is NULL, or contradicting + // transfer direction + // + ((Packet->InTransferLength > 0) && + ((Packet->InDataBuffer == NULL) || + (Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_WRITE) + ) + ) || + // + // Trying to send, but source pointer is NULL, or contradicting + // transfer direction + // + ((Packet->OutTransferLength > 0) && + ((Packet->OutDataBuffer == NULL) || + (Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_READ) + ) + ) + ) { + + // + // This error code doesn't require updates to the Packet output fields + // + return EFI_INVALID_PARAMETER; + } + + // + // Check for input/output buffer too large for DMA communication buffer + // + if (Packet->InTransferLength > sizeof (Dev->DmaBuf->Data)) { + Packet->InTransferLength = sizeof (Dev->DmaBuf->Data); + return EFI_BAD_BUFFER_SIZE; + } + if (Packet->OutTransferLength > sizeof (Dev->DmaBuf->Data)) { + Packet->OutTransferLength = sizeof (Dev->DmaBuf->Data); + return EFI_BAD_BUFFER_SIZE; + } + + // + // Encode PVSCSI request + // + ZeroMem (Request, sizeof (*Request)); + + Request->Bus = 0; + Request->Target = TargetValue; + // + // This cast is safe as MaxLun is defined as UINT8 + // + Request->Lun[1] = (UINT8)Lun; + Request->SenseLen = Packet->SenseDataLength; + Request->SenseAddr = (UINT64)PVSCSI_DMA_BUF_DEV_ADDR (Dev, SenseData); + Request->CdbLen = Packet->CdbLength; + CopyMem (Request->Cdb, Packet->Cdb, Packet->CdbLength); + Request->VcpuHint = 0; + Request->Tag = PVSCSI_SIMPLE_QUEUE_TAG; + if (Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_READ) { + Request->Flags = PVSCSI_FLAG_CMD_DIR_TOHOST; + Request->DataLen = Packet->InTransferLength; + } else { + Request->Flags = PVSCSI_FLAG_CMD_DIR_TODEVICE; + Request->DataLen = Packet->OutTransferLength; + CopyMem ( + Dev->DmaBuf->Data, + Packet->OutDataBuffer, + Packet->OutTransferLength + ); + } + Request->DataAddr = (UINT64)PVSCSI_DMA_BUF_DEV_ADDR (Dev, Data); + + return EFI_SUCCESS; +} + +/** + Handle the PVSCSI device response: + - Copy returned data from DMA communication buffer. + - Update fields in Extended SCSI Pass Thru Protocol packet as required. + - Translate response code to EFI status code and host adapter status. +**/ +STATIC +EFI_STATUS +HandleResponse ( + IN PVSCSI_DEV *Dev, + IN OUT EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET *Packet, + IN CONST PVSCSI_RING_CMP_DESC *Response + ) +{ + // + // Check if device returned sense data + // + if (Response->ScsiStatus == EFI_EXT_SCSI_STATUS_TARGET_CHECK_CONDITION) { + // + // Fix SenseDataLength to amount of data returned + // + if (Packet->SenseDataLength > Response->SenseLen) { + Packet->SenseDataLength = (UINT8)Response->SenseLen; + } + // + // Copy sense data from DMA communication buffer + // + CopyMem ( + Packet->SenseData, + Dev->DmaBuf->SenseData, + Packet->SenseDataLength + ); + } else { + // + // Signal no sense data returned + // + Packet->SenseDataLength = 0; + } + + // + // Copy device output from DMA communication buffer + // + if (Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_READ) { + CopyMem (Packet->InDataBuffer, Dev->DmaBuf->Data, Packet->InTransferLength); + } + + // + // Report target status + // + Packet->TargetStatus = Response->ScsiStatus; + + // + // Host adapter status and function return value depend on + // device response's host status + // + switch (Response->HostStatus) { + case PvScsiBtStatSuccess: + case PvScsiBtStatLinkedCommandCompleted: + case PvScsiBtStatLinkedCommandCompletedWithFlag: + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_OK; + return EFI_SUCCESS; + + case PvScsiBtStatSelTimeout: + Packet->HostAdapterStatus = + EFI_EXT_SCSI_STATUS_HOST_ADAPTER_SELECTION_TIMEOUT; + return EFI_TIMEOUT; + + case PvScsiBtStatDatarun: + case PvScsiBtStatDataUnderrun: + // + // Report residual data in overrun/underrun + // + if (Packet->DataDirection == EFI_EXT_SCSI_DATA_DIRECTION_READ) { + Packet->InTransferLength = Response->DataLen; + } else { + Packet->OutTransferLength = Response->DataLen; + } + Packet->HostAdapterStatus = + EFI_EXT_SCSI_STATUS_HOST_ADAPTER_DATA_OVERRUN_UNDERRUN; + return EFI_BAD_BUFFER_SIZE; + + case PvScsiBtStatBusFree: + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_BUS_FREE; + break; + + case PvScsiBtStatInvPhase: + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_PHASE_ERROR; + break; + + case PvScsiBtStatSensFailed: + Packet->HostAdapterStatus = + EFI_EXT_SCSI_STATUS_HOST_ADAPTER_REQUEST_SENSE_FAILED; + break; + + case PvScsiBtStatTagReject: + case PvScsiBtStatBadMsg: + Packet->HostAdapterStatus = + EFI_EXT_SCSI_STATUS_HOST_ADAPTER_MESSAGE_REJECT; + break; + + case PvScsiBtStatBusReset: + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_BUS_RESET; + break; + + case PvScsiBtStatHaTimeout: + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_TIMEOUT; + return EFI_TIMEOUT; + + case PvScsiBtStatScsiParity: + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_PARITY_ERROR; + break; + + default: + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_OTHER; + break; + } + + return EFI_DEVICE_ERROR; +} + /** Check if Target argument to EXT_SCSI_PASS_THRU.GetNextTarget() and EXT_SCSI_PASS_THRU.GetNextTargetLun() is initialized @@ -129,6 +496,23 @@ IsTargetInitialized ( return FALSE; } +/** + Create a fake host adapter error +**/ +STATIC +EFI_STATUS +ReportHostAdapterError ( + OUT EFI_EXT_SCSI_PASS_THRU_SCSI_REQUEST_PACKET *Packet + ) +{ + Packet->InTransferLength = 0; + Packet->OutTransferLength = 0; + Packet->SenseDataLength = 0; + Packet->HostAdapterStatus = EFI_EXT_SCSI_STATUS_HOST_ADAPTER_OTHER; + Packet->TargetStatus = EFI_EXT_SCSI_STATUS_TARGET_GOOD; + return EFI_DEVICE_ERROR; +} + // // Ext SCSI Pass Thru // @@ -144,7 +528,62 @@ PvScsiPassThru ( IN EFI_EVENT Event OPTIONAL ) { - return EFI_UNSUPPORTED; + PVSCSI_DEV *Dev; + EFI_STATUS Status; + PVSCSI_RING_REQ_DESC *Request; + PVSCSI_RING_CMP_DESC *Response; + + Dev = PVSCSI_FROM_PASS_THRU (This); + + if (PvScsiIsReqRingFull (Dev)) { + return EFI_NOT_READY; + } + + Request = PvScsiGetCurrentRequest (Dev); + + Status = PopulateRequest (Dev, Target, Lun, Packet, Request); + if (EFI_ERROR (Status)) { + return Status; + } + + // + // Writes to Request must be globally visible before making request + // available to device + // + MemoryFence (); + Dev->RingDesc.RingState->ReqProdIdx++; + + Status = PvScsiMmioWrite32 (Dev, PvScsiRegOffsetKickRwIo, 0); + if (EFI_ERROR (Status)) { + // + // If kicking the host fails, we must fake a host adapter error. + // EFI_NOT_READY would save us the effort, but it would also suggest that + // the caller retry. + // + return ReportHostAdapterError (Packet); + } + + Status = PvScsiWaitForRequestCompletion (Dev); + if (EFI_ERROR (Status)) { + // + // If waiting for request completion fails, we must fake a host adapter + // error. EFI_NOT_READY would save us the effort, but it would also suggest + // that the caller retry. + // + return ReportHostAdapterError (Packet); + } + + Response = PvScsiGetCurrentResponse (Dev); + Status = HandleResponse (Dev, Packet, Response); + + // + // Reads from response must complete before releasing completion entry + // to device + // + MemoryFence (); + Dev->RingDesc.RingState->CmpConsIdx++; + + return Status; } STATIC @@ -685,6 +1124,7 @@ PvScsiInit ( // Dev->MaxTarget = PcdGet8 (PcdPvScsiMaxTargetLimit); Dev->MaxLun = PcdGet8 (PcdPvScsiMaxLunLimit); + Dev->WaitForCmpStallInUsecs = PcdGet32 (PcdPvScsiWaitForCmpStallInUsecs); // // Set PCI Attributes diff --git a/OvmfPkg/PvScsiDxe/PvScsi.h b/OvmfPkg/PvScsiDxe/PvScsi.h index 7f91d70fec79..08e876b75930 100644 --- a/OvmfPkg/PvScsiDxe/PvScsi.h +++ b/OvmfPkg/PvScsiDxe/PvScsi.h @@ -47,6 +47,7 @@ typedef struct { PVSCSI_DMA_DESC DmaBufDmaDesc; UINT8 MaxTarget; UINT8 MaxLun; + UINTN WaitForCmpStallInUsecs; EFI_EXT_SCSI_PASS_THRU_PROTOCOL PassThru; EFI_EXT_SCSI_PASS_THRU_MODE PassThruMode; } PVSCSI_DEV; diff --git a/OvmfPkg/PvScsiDxe/PvScsiDxe.inf b/OvmfPkg/PvScsiDxe/PvScsiDxe.inf index fcffc90d46c8..ae6d8753623f 100644 --- a/OvmfPkg/PvScsiDxe/PvScsiDxe.inf +++ b/OvmfPkg/PvScsiDxe/PvScsiDxe.inf @@ -38,5 +38,6 @@ gEfiPciIoProtocolGuid ## TO_START [Pcd] - gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxLunLimit ## CONSUMES - gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxTargetLimit ## CONSUMES + gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxLunLimit ## CONSUMES + gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiMaxTargetLimit ## CONSUMES + gUefiOvmfPkgTokenSpaceGuid.PcdPvScsiWaitForCmpStallInUsecs ## CONSUMES -- 2.20.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#56322): https://edk2.groups.io/g/devel/message/56322 Mute This Topic: https://groups.io/mt/72544127/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
