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2ff3db3a1c
Add test coverage for blk_write() as well. The blk_erase() is not tested for now as the USB stor interface does not support erase. Signed-off-by: Simon Glass <sjg@chromium.org>
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Emulation of enough SCSI commands to find and read from a unit
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*
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* Copyright 2022 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*
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* implementations of SCSI functions required so that CONFIG_SCSI can be enabled
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* for sandbox
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*/
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#ifndef __scsi_emul_h
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#define __scsi_emul_h
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/**
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* struct scsi_emul_info - information for emulating a SCSI device
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*
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* @vendor: Vendor name
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* @product: Product name
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* @block_size: Block size of device in bytes (normally 512)
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* @file_size: Size of the backing file for this emulator, in bytes
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* @seek_block: Seek position for file (block number)
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*
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* @phase: Current SCSI phase
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* @buff_used: Number of bytes ready to transfer back to host
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* @read_len: Number of bytes of data left in the current read command
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* @alloc_len: Allocation length from the last incoming command
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* @transfer_len: Transfer length from CBW header
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* @buff: Data buffer for outgoing data
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*/
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struct scsi_emul_info {
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/* provided by the caller: */
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void *buff;
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const char *vendor;
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const char *product;
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int block_size;
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loff_t file_size;
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int seek_block;
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/* state maintained by the emulator: */
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enum scsi_cmd_phase phase;
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int buff_used;
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int read_len;
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int write_len;
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uint seek_pos;
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int alloc_len;
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uint transfer_len;
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};
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/**
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* Return value from sb_scsi_emul_command() indicates that a read or write is
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* being started
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*/
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enum {
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SCSI_EMUL_DO_READ = 1,
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SCSI_EMUL_DO_WRITE = 2,
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};
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/**
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* sb_scsi_emul_command() - Process a SCSI command
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*
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* This sets up the response in info->buff and updates various other values
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* in info.
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*
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* If SCSI_EMUL_DO_READ is returned then the caller should set up so that the
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* backing file can be read, or return an error status if there is no file.
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*
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* @info: Emulation information
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* @req: Request to process
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* @len: Length of request in bytes
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* @return SCSI_EMUL_DO_READ if a read has started, SCSI_EMUL_DO_WRITE if a
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* write has started, 0 if some other operation has started, -ve if there
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* was an error
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*/
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int sb_scsi_emul_command(struct scsi_emul_info *info,
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const struct scsi_cmd *req, int len);
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#endif
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