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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Storage Class */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_class_storage.h" |
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#include "ux_host_stack.h" |
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#if !defined(UX_HOST_STANDALONE) |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_class_storage_transport_bo PORTABLE C */ |
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/* 6.1.10 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function is the transport layer for the Bulk Only protocol. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* storage Pointer to storage class */ |
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/* data_pointer Pointer to data */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* The transfer completion status. It's possible for the transfer to */ |
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/* succeed but for the command to fail. The CSW must be checked to */ |
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/* determine command status. */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_class_storage_device_reset Reset mass storage */ |
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/* _ux_host_stack_endpoint_reset Reset endpoint */ |
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/* _ux_host_stack_transfer_request Process host stack transfer */ |
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/* _ux_host_stack_transfer_request_abort Abort transfer request */ |
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/* _ux_utility_memory_allocate Allocate memory */ |
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/* _ux_utility_memory_free Free memory */ |
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/* _ux_utility_long_get Get 32-bit word */ |
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/* _ux_host_semaphore_get Get semaphore */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Storage Class */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */ |
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/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */ |
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/* prefixed UX to MS_TO_TICK, */ |
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/* resulting in version 6.1 */ |
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/* 01-31-2022 Chaoqiong Xiao Modified comment(s), */ |
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/* refined macros names, */ |
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/* resulting in version 6.1.10 */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_class_storage_transport_bo(UX_HOST_CLASS_STORAGE *storage, UCHAR *data_pointer) |
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{ |
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UX_TRANSFER *transfer_request; |
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UINT status; |
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UCHAR *cbw; |
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UINT retry; |
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ULONG data_phase_requested_length; |
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ULONG data_phase_transfer_size; |
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UCHAR *get_status_response; |
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/* Get the pointer to the transfer request. */ |
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transfer_request = &storage -> ux_host_class_storage_bulk_out_endpoint -> ux_endpoint_transfer_request; |
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/* Use a pointer for the cbw, easier to manipulate. */ |
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cbw = (UCHAR *) storage -> ux_host_class_storage_cbw; |
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/* Fill in the transfer request parameters. */ |
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transfer_request -> ux_transfer_request_data_pointer = cbw; |
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transfer_request -> ux_transfer_request_requested_length = UX_HOST_CLASS_STORAGE_CBW_LENGTH; |
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/* It's possible for the bulk out endpoint to stall; in that case, we clear |
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it and try again. */ |
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for (retry = 0; ; retry++) |
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{ |
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/* Send the CBW on the bulk out endpoint. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* Check the status of the command (NB, the command is not sent yet since |
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the bulk transport is non blocking). */ |
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✓✓ |
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if (status != UX_SUCCESS) |
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return(status); |
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/* Wait for the completion of the transfer request. */ |
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status = _ux_host_semaphore_get(&transfer_request -> ux_transfer_request_semaphore, UX_MS_TO_TICK(UX_HOST_CLASS_STORAGE_TRANSFER_TIMEOUT)); |
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/* If the semaphore did not succeed we probably have a time out. */ |
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✓✓ |
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if (status != UX_SUCCESS) |
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{ |
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/* All transfers pending need to abort. There may have been a partial transfer. */ |
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_ux_host_stack_transfer_request_abort(transfer_request); |
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/* Set the completion code. */ |
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transfer_request -> ux_transfer_request_completion_code = UX_TRANSFER_TIMEOUT; |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_TIMEOUT); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_TRANSFER_TIMEOUT, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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/* There was an error, return to the caller. */ |
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return(UX_TRANSFER_TIMEOUT); |
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} |
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/* Did we successfully send the CBW? */ |
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✓✓ |
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if (transfer_request -> ux_transfer_request_completion_code == UX_SUCCESS) |
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/* Jump to the data stage. */ |
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break; |
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/* The transfer stalled. Is this the first time? */ |
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✓✓ |
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if (retry == 0) |
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{ |
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/* We must do a reset recovery. */ |
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_ux_host_class_storage_device_reset(storage); |
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/* In virtually all cases, the reset should've fixed it, so just |
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resend the command. */ |
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} |
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else |
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{ |
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/* Well, we tried! */ |
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return(transfer_request -> ux_transfer_request_completion_code); |
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} |
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} |
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/* Get the length of the data payload. */ |
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data_phase_requested_length = _ux_utility_long_get(cbw + UX_HOST_CLASS_STORAGE_CBW_DATA_LENGTH); |
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/* Reset the data phase memory size. */ |
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storage -> ux_host_class_storage_data_phase_length = 0; |
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/* Perform the data stage - if there is any. */ |
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✓✓ |
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while (data_phase_requested_length != 0) |
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{ |
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/* Check if we can finish the transaction with one data phase. */ |
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✓✓ |
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if (data_phase_requested_length > UX_HOST_CLASS_STORAGE_MAX_TRANSFER_SIZE) |
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/* We have too much data to send in one phase. Split into smaller chunks. */ |
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data_phase_transfer_size = UX_HOST_CLASS_STORAGE_MAX_TRANSFER_SIZE; |
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else |
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/* The transfer size can be the requested length. */ |
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data_phase_transfer_size = data_phase_requested_length; |
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/* Check the direction and determine which endpoint to use. */ |
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✓✓ |
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if (*(cbw + UX_HOST_CLASS_STORAGE_CBW_FLAGS) == UX_HOST_CLASS_STORAGE_DATA_IN) |
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transfer_request = &storage -> ux_host_class_storage_bulk_in_endpoint -> ux_endpoint_transfer_request; |
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/* Fill in the transfer request data payload buffer. */ |
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transfer_request -> ux_transfer_request_data_pointer = data_pointer; |
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/* Store the requested length in the transfer request. */ |
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transfer_request -> ux_transfer_request_requested_length = data_phase_transfer_size; |
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/* Perform data payload transfer (in or out). */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* Check the status of the data payload. */ |
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✓✓ |
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if (status == UX_SUCCESS) |
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/* Wait for the completion of the transfer request. */ |
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status = _ux_host_semaphore_get(&transfer_request -> ux_transfer_request_semaphore, UX_MS_TO_TICK(UX_HOST_CLASS_STORAGE_TRANSFER_TIMEOUT)); |
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/* If the semaphore did not succeed we may have a time out or if we had a problem during the preparation of the transaction |
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we should abort the SCSI transaction. */ |
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✓✓ |
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if (status != UX_SUCCESS) |
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{ |
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/* All transfers pending need to abort. There may have been a partial transfer. */ |
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_ux_host_stack_transfer_request_abort(transfer_request); |
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/* Set the completion code. */ |
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transfer_request -> ux_transfer_request_completion_code = UX_TRANSFER_TIMEOUT; |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_TIMEOUT); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_TRANSFER_TIMEOUT, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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/* There was an error that cannot be recovered, return to the caller. */ |
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return(UX_TRANSFER_TIMEOUT); |
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} |
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/* Check the transfer status. If there is a transport error, we still need to read the CSW |
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and let the upper layer retry. */ |
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✓✓ |
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if (transfer_request -> ux_transfer_request_completion_code != UX_SUCCESS) |
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{ |
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/* This is most likely a STALL. We must clear it and go straight |
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to reading the CSW. Note this doesn't necessarily mean the transfer |
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failed completely failed. For example, if this was a read, it |
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could mean the device had less data to send than we requested, |
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but we still received data. */ |
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/* Check the direction and determine which endpoint to reset. */ |
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✓✓ |
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if (*(cbw + UX_HOST_CLASS_STORAGE_CBW_FLAGS) == UX_HOST_CLASS_STORAGE_DATA_IN) |
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_ux_host_stack_endpoint_reset(storage -> ux_host_class_storage_bulk_in_endpoint); |
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else |
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_ux_host_stack_endpoint_reset(storage -> ux_host_class_storage_bulk_out_endpoint); |
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/* We need to read the CSW now. */ |
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break; |
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} |
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/* Adjust the total size that was requested. */ |
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data_phase_requested_length -= data_phase_transfer_size; |
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/* And the data pointer. */ |
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data_pointer += data_phase_transfer_size; |
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} |
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/* Now perform the status phase, i.e. try to get the CSW from the device. |
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According to the spec, if there is a failure the first time, we need to retry once |
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before reporting an error. */ |
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/* Get the pointer to the transfer request, on the bulk in endpoint. */ |
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transfer_request = &storage -> ux_host_class_storage_bulk_in_endpoint -> ux_endpoint_transfer_request; |
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/* Fill in the transfer_request parameters. */ |
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transfer_request -> ux_transfer_request_data_pointer = (UCHAR *) &storage -> ux_host_class_storage_csw; |
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transfer_request -> ux_transfer_request_requested_length = UX_HOST_CLASS_STORAGE_CSW_LENGTH; |
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/* Retry loop, we have 2 tries here. */ |
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✓✓ |
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for (retry = 0; retry < 2; retry++) |
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{ |
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/* Get the CSW on the bulk in endpoint. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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✓✓ |
2862 |
if (status != UX_SUCCESS) |
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return(status); |
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/* Wait for the completion of the transfer request. */ |
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status = _ux_host_semaphore_get(&transfer_request -> ux_transfer_request_semaphore, UX_MS_TO_TICK(UX_HOST_CLASS_STORAGE_TRANSFER_TIMEOUT)); |
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/* Check semaphore status. */ |
281 |
✓✓ |
2861 |
if (status != UX_SUCCESS) |
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{ |
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/* All transfers pending need to abort. There may have been a partial transfer. */ |
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_ux_host_stack_transfer_request_abort(transfer_request); |
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/* Set the completion code. */ |
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transfer_request -> ux_transfer_request_completion_code = UX_TRANSFER_TIMEOUT; |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_TIMEOUT); |
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293 |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_TRANSFER_TIMEOUT, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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/* There was an error, return to the caller. */ |
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1 |
return(UX_TRANSFER_TIMEOUT); |
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} |
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300 |
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/* Did the transfer succeed? */ |
301 |
✓✓ |
2860 |
if (transfer_request -> ux_transfer_request_completion_code == UX_SUCCESS) |
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{ |
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/* The PASSED and COMMAND_FAILED error codes are nearly interchangeable |
305 |
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according to the spec, so we treat them similarly. */ |
306 |
✓✓ |
2346 |
if (storage -> ux_host_class_storage_csw[UX_HOST_CLASS_STORAGE_CSW_STATUS] == UX_HOST_CLASS_STORAGE_CSW_PASSED || |
307 |
✓✓ |
194 |
storage -> ux_host_class_storage_csw[UX_HOST_CLASS_STORAGE_CSW_STATUS] == UX_HOST_CLASS_STORAGE_CSW_FAILED) |
308 |
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{ |
309 |
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310 |
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/* Was this an OUT transport? */ |
311 |
✓✓ |
2343 |
if (*(cbw + UX_HOST_CLASS_STORAGE_CBW_FLAGS) == UX_HOST_CLASS_STORAGE_DATA_OUT) |
312 |
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{ |
313 |
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314 |
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/* Did the command fail, or succeed with non-zero data residue? */ |
315 |
✓✓✓✓
|
1482 |
if (storage -> ux_host_class_storage_csw[UX_HOST_CLASS_STORAGE_CSW_STATUS] == UX_HOST_CLASS_STORAGE_CSW_FAILED || |
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|
669 |
_ux_utility_long_get(storage -> ux_host_class_storage_csw + UX_HOST_CLASS_STORAGE_CSW_DATA_RESIDUE) != 0) |
317 |
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{ |
318 |
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319 |
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/* It's possible the bulk out endpoint is stalled. |
320 |
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This happens when 1) the device expects less data |
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than the host wants to send and 2) the endpoint |
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stalls after the last packet was sent (otherwise, |
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we'd have seen the stall during the data stage). |
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Query its status before clearing the stall. */ |
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326 |
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/* Allocate memory for Get Status response. */ |
327 |
|
147 |
get_status_response = _ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY, 2); |
328 |
✓✓ |
147 |
if (get_status_response == UX_NULL) |
329 |
|
1 |
return(UX_MEMORY_INSUFFICIENT); |
330 |
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331 |
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/* Get the control endpoint's transfer request. */ |
332 |
|
146 |
transfer_request = &storage -> ux_host_class_storage_device -> ux_device_control_endpoint.ux_endpoint_transfer_request; |
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334 |
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/* Setup transfer request for Get Status command. */ |
335 |
|
146 |
transfer_request -> ux_transfer_request_data_pointer = get_status_response; |
336 |
|
146 |
transfer_request -> ux_transfer_request_requested_length = 0x02; |
337 |
|
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transfer_request -> ux_transfer_request_function = UX_GET_STATUS; |
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|
146 |
transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_ENDPOINT; |
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transfer_request -> ux_transfer_request_value = 0; |
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|
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transfer_request -> ux_transfer_request_index = storage -> ux_host_class_storage_bulk_out_endpoint-> ux_endpoint_descriptor.bEndpointAddress; |
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342 |
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/* Send transfer request. */ |
343 |
|
146 |
status = _ux_host_stack_transfer_request(transfer_request); |
344 |
|
|
|
345 |
|
|
/* Check status of transfer. */ |
346 |
✓✓ |
146 |
if (status == UX_SUCCESS) |
347 |
|
|
{ |
348 |
|
|
|
349 |
|
|
/* Check the Halt bit. */ |
350 |
✓✓ |
145 |
if (get_status_response[0] & 0x01) |
351 |
|
|
{ |
352 |
|
|
|
353 |
|
|
/* Clear the halt. */ |
354 |
|
32 |
status = _ux_host_stack_endpoint_reset(storage -> ux_host_class_storage_bulk_out_endpoint); |
355 |
|
|
} |
356 |
|
|
} |
357 |
|
|
|
358 |
|
|
/* Free the get status memory. */ |
359 |
|
146 |
_ux_utility_memory_free(get_status_response); |
360 |
|
|
|
361 |
|
|
/* Check result of Get Status and Clear Feature commands. */ |
362 |
✓✓ |
146 |
if (status != UX_SUCCESS) |
363 |
|
1 |
return(status); |
364 |
|
|
} |
365 |
|
|
} |
366 |
|
|
|
367 |
|
|
/* Save the amount of relevant data. */ |
368 |
|
4682 |
storage -> ux_host_class_storage_data_phase_length = _ux_utility_long_get(cbw + UX_HOST_CLASS_STORAGE_CBW_DATA_LENGTH) - |
369 |
|
2341 |
_ux_utility_long_get(storage -> ux_host_class_storage_csw + UX_HOST_CLASS_STORAGE_CSW_DATA_RESIDUE); |
370 |
|
|
} |
371 |
|
|
else |
372 |
|
|
{ |
373 |
|
|
|
374 |
|
|
/* Must be phase error. Need to reset the device. */ |
375 |
|
3 |
_ux_host_class_storage_device_reset(storage); |
376 |
|
|
} |
377 |
|
|
|
378 |
|
|
/* Return success since the transfer succeeded. The caller should |
379 |
|
|
look at the CSW to determine if the command's status. */ |
380 |
|
2344 |
return(UX_SUCCESS); |
381 |
|
|
} |
382 |
|
|
|
383 |
|
|
/* The transfer stalled. We must clear the stall and attempt to read |
384 |
|
|
the CSW again. */ |
385 |
|
514 |
_ux_host_stack_endpoint_reset(storage -> ux_host_class_storage_bulk_in_endpoint); |
386 |
|
|
} |
387 |
|
|
|
388 |
|
|
/* If we get here, the CSW transfer stalled twice. We must reset the device. */ |
389 |
|
255 |
_ux_host_class_storage_device_reset(storage); |
390 |
|
|
|
391 |
|
|
/* Return the error. */ |
392 |
|
255 |
return(transfer_request -> ux_transfer_request_completion_code); |
393 |
|
|
} |
394 |
|
|
#endif |