root / hw / scsi-generic.c @ 2e7cc4d6
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/*
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* Generic SCSI Device support
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*
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* Copyright (c) 2007 Bull S.A.S.
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* Based on code by Paul Brook
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* Based on code by Fabrice Bellard
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*
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* Written by Laurent Vivier <Laurent.Vivier@bull.net>
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*
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* This code is licenced under the LGPL.
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*
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*/
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#include "qemu-common.h" |
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#include "qemu-error.h" |
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#include "scsi.h" |
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#include "blockdev.h" |
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#ifdef __linux__
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//#define DEBUG_SCSI
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#ifdef DEBUG_SCSI
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#define DPRINTF(fmt, ...) \
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do { printf("scsi-generic: " fmt , ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) do {} while(0) |
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#endif
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#define BADF(fmt, ...) \
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do { fprintf(stderr, "scsi-generic: " fmt , ## __VA_ARGS__); } while (0) |
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#include <stdio.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <unistd.h> |
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#include <scsi/sg.h> |
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#include "scsi-defs.h" |
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#define SCSI_SENSE_BUF_SIZE 96 |
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#define SG_ERR_DRIVER_TIMEOUT 0x06 |
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#define SG_ERR_DRIVER_SENSE 0x08 |
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|
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#ifndef MAX_UINT
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#define MAX_UINT ((unsigned int)-1) |
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#endif
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typedef struct SCSIGenericState SCSIGenericState; |
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typedef struct SCSIGenericReq { |
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SCSIRequest req; |
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uint8_t *buf; |
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int buflen;
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int len;
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sg_io_hdr_t io_header; |
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} SCSIGenericReq; |
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struct SCSIGenericState
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{
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SCSIDevice qdev; |
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BlockDriverState *bs; |
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int lun;
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int driver_status;
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uint8_t sensebuf[SCSI_SENSE_BUF_SIZE]; |
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uint8_t senselen; |
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}; |
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static void scsi_set_sense(SCSIGenericState *s, SCSISense sense) |
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{
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s->senselen = scsi_build_sense(sense, s->sensebuf, SCSI_SENSE_BUF_SIZE, 0);
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s->driver_status = SG_ERR_DRIVER_SENSE; |
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} |
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static void scsi_clear_sense(SCSIGenericState *s) |
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{
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memset(s->sensebuf, 0, SCSI_SENSE_BUF_SIZE);
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s->senselen = 0;
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s->driver_status = 0;
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} |
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static int scsi_get_sense(SCSIRequest *req, uint8_t *outbuf, int len) |
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, req->dev); |
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int size = SCSI_SENSE_BUF_SIZE;
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if (!(s->driver_status & SG_ERR_DRIVER_SENSE)) {
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size = scsi_build_sense(SENSE_CODE(NO_SENSE), s->sensebuf, |
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SCSI_SENSE_BUF_SIZE, 0);
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} |
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if (size > len) {
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size = len; |
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} |
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memcpy(outbuf, s->sensebuf, size); |
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return size;
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} |
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static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun)
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{
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SCSIRequest *req; |
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req = scsi_req_alloc(sizeof(SCSIGenericReq), d, tag, lun);
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return req;
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} |
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static void scsi_free_request(SCSIRequest *req) |
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
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qemu_free(r->buf); |
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} |
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/* Helper function for command completion. */
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static void scsi_command_complete(void *opaque, int ret) |
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{
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SCSIGenericReq *r = (SCSIGenericReq *)opaque; |
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev); |
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r->req.aiocb = NULL;
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s->driver_status = r->io_header.driver_status; |
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if (s->driver_status & SG_ERR_DRIVER_SENSE)
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s->senselen = r->io_header.sb_len_wr; |
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if (ret != 0) { |
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switch (ret) {
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case -EDOM:
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r->req.status = TASK_SET_FULL; |
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break;
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case -EINVAL:
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r->req.status = CHECK_CONDITION; |
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scsi_set_sense(s, SENSE_CODE(INVALID_FIELD)); |
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break;
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case -ENOMEM:
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r->req.status = CHECK_CONDITION; |
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scsi_set_sense(s, SENSE_CODE(TARGET_FAILURE)); |
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break;
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default:
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r->req.status = CHECK_CONDITION; |
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scsi_set_sense(s, SENSE_CODE(IO_ERROR)); |
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break;
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} |
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} else {
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if (s->driver_status & SG_ERR_DRIVER_TIMEOUT) {
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r->req.status = BUSY; |
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BADF("Driver Timeout\n");
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} else if (r->io_header.status) |
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r->req.status = r->io_header.status; |
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else if (s->driver_status & SG_ERR_DRIVER_SENSE) |
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r->req.status = CHECK_CONDITION; |
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else
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r->req.status = GOOD; |
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} |
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DPRINTF("Command complete 0x%p tag=0x%x status=%d\n",
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r, r->req.tag, r->req.status); |
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scsi_req_complete(&r->req); |
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} |
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/* Cancel a pending data transfer. */
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static void scsi_cancel_io(SCSIRequest *req) |
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
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DPRINTF("Cancel tag=0x%x\n", req->tag);
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if (r->req.aiocb) {
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bdrv_aio_cancel(r->req.aiocb); |
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} |
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r->req.aiocb = NULL;
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} |
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static int execute_command(BlockDriverState *bdrv, |
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SCSIGenericReq *r, int direction,
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BlockDriverCompletionFunc *complete) |
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev); |
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r->io_header.interface_id = 'S';
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r->io_header.dxfer_direction = direction; |
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r->io_header.dxferp = r->buf; |
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r->io_header.dxfer_len = r->buflen; |
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r->io_header.cmdp = r->req.cmd.buf; |
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r->io_header.cmd_len = r->req.cmd.len; |
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r->io_header.mx_sb_len = sizeof(s->sensebuf);
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r->io_header.sbp = s->sensebuf; |
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r->io_header.timeout = MAX_UINT; |
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r->io_header.usr_ptr = r; |
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r->io_header.flags |= SG_FLAG_DIRECT_IO; |
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r->req.aiocb = bdrv_aio_ioctl(bdrv, SG_IO, &r->io_header, complete, r); |
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if (r->req.aiocb == NULL) { |
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BADF("execute_command: read failed !\n");
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return -ENOMEM;
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} |
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return 0; |
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} |
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static void scsi_read_complete(void * opaque, int ret) |
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{
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SCSIGenericReq *r = (SCSIGenericReq *)opaque; |
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int len;
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r->req.aiocb = NULL;
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if (ret) {
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DPRINTF("IO error ret %d\n", ret);
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scsi_command_complete(r, ret); |
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return;
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} |
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len = r->io_header.dxfer_len - r->io_header.resid; |
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DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, len);
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r->len = -1;
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if (len == 0) { |
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scsi_command_complete(r, 0);
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} else {
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scsi_req_data(&r->req, len); |
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} |
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} |
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/* Read more data from scsi device into buffer. */
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static void scsi_read_data(SCSIRequest *req) |
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev); |
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int ret;
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DPRINTF("scsi_read_data 0x%x\n", req->tag);
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if (r->len == -1) { |
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scsi_command_complete(r, 0);
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return;
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} |
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if (r->req.cmd.buf[0] == REQUEST_SENSE && s->driver_status & SG_ERR_DRIVER_SENSE) |
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{
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s->senselen = MIN(r->len, s->senselen); |
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memcpy(r->buf, s->sensebuf, s->senselen); |
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r->io_header.driver_status = 0;
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r->io_header.status = 0;
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r->io_header.dxfer_len = s->senselen; |
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r->len = -1;
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DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, s->senselen);
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DPRINTF("Sense: %d %d %d %d %d %d %d %d\n",
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r->buf[0], r->buf[1], r->buf[2], r->buf[3], |
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r->buf[4], r->buf[5], r->buf[6], r->buf[7]); |
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scsi_req_data(&r->req, s->senselen); |
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/* Clear sensebuf after REQUEST_SENSE */
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scsi_clear_sense(s); |
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return;
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} |
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ret = execute_command(s->bs, r, SG_DXFER_FROM_DEV, scsi_read_complete); |
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if (ret < 0) { |
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scsi_command_complete(r, ret); |
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return;
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} |
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} |
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static void scsi_write_complete(void * opaque, int ret) |
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{
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SCSIGenericReq *r = (SCSIGenericReq *)opaque; |
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, r->req.dev); |
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DPRINTF("scsi_write_complete() ret = %d\n", ret);
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r->req.aiocb = NULL;
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if (ret) {
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DPRINTF("IO error\n");
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scsi_command_complete(r, ret); |
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return;
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} |
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if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 && |
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s->qdev.type == TYPE_TAPE) {
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s->qdev.blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11]; |
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DPRINTF("block size %d\n", s->qdev.blocksize);
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} |
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scsi_command_complete(r, ret); |
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} |
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/* Write data to a scsi device. Returns nonzero on failure.
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The transfer may complete asynchronously. */
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static void scsi_write_data(SCSIRequest *req) |
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, req->dev); |
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
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int ret;
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DPRINTF("scsi_write_data 0x%x\n", req->tag);
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if (r->len == 0) { |
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r->len = r->buflen; |
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scsi_req_data(&r->req, r->len); |
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return;
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} |
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|
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ret = execute_command(s->bs, r, SG_DXFER_TO_DEV, scsi_write_complete); |
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if (ret < 0) { |
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scsi_command_complete(r, ret); |
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} |
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} |
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|
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/* Return a pointer to the data buffer. */
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static uint8_t *scsi_get_buf(SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
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return r->buf;
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} |
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|
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static void scsi_req_fixup(SCSIRequest *req) |
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{
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switch(req->cmd.buf[0]) { |
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case WRITE_10:
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req->cmd.buf[1] &= ~0x08; /* disable FUA */ |
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break;
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case READ_10:
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req->cmd.buf[1] &= ~0x08; /* disable FUA */ |
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break;
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case REWIND:
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case START_STOP:
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if (req->dev->type == TYPE_TAPE) {
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/* force IMMED, otherwise qemu waits end of command */
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req->cmd.buf[1] = 0x01; |
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} |
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break;
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} |
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} |
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|
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/* Execute a scsi command. Returns the length of the data expected by the
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command. This will be Positive for data transfers from the device
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(eg. disk reads), negative for transfers to the device (eg. disk writes),
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and zero if the command does not transfer any data. */
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static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, req->dev); |
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req); |
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int ret;
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|
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if (cmd[0] != REQUEST_SENSE && |
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(req->lun != s->lun || (cmd[1] >> 5) != s->lun)) { |
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DPRINTF("Unimplemented LUN %d\n", req->lun ? req->lun : cmd[1] >> 5); |
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scsi_set_sense(s, SENSE_CODE(LUN_NOT_SUPPORTED)); |
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r->req.status = CHECK_CONDITION; |
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scsi_req_complete(&r->req); |
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return 0; |
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} |
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|
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if (-1 == scsi_req_parse(&r->req, cmd)) { |
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BADF("Unsupported command length, command %x\n", cmd[0]); |
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scsi_command_complete(r, -EINVAL); |
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return 0; |
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} |
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scsi_req_fixup(&r->req); |
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|
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DPRINTF("Command: lun=%d tag=0x%x len %zd data=0x%02x", lun, tag,
|
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r->req.cmd.xfer, cmd[0]);
|
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|
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#ifdef DEBUG_SCSI
|
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{
|
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int i;
|
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for (i = 1; i < r->req.cmd.len; i++) { |
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printf(" 0x%02x", cmd[i]);
|
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} |
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printf("\n");
|
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} |
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#endif
|
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|
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if (r->req.cmd.xfer == 0) { |
| 370 |
if (r->buf != NULL) |
| 371 |
qemu_free(r->buf); |
| 372 |
r->buflen = 0;
|
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r->buf = NULL;
|
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ret = execute_command(s->bs, r, SG_DXFER_NONE, scsi_command_complete); |
| 375 |
if (ret < 0) { |
| 376 |
scsi_command_complete(r, ret); |
| 377 |
return 0; |
| 378 |
} |
| 379 |
return 0; |
| 380 |
} |
| 381 |
|
| 382 |
if (r->buflen != r->req.cmd.xfer) {
|
| 383 |
if (r->buf != NULL) |
| 384 |
qemu_free(r->buf); |
| 385 |
r->buf = qemu_malloc(r->req.cmd.xfer); |
| 386 |
r->buflen = r->req.cmd.xfer; |
| 387 |
} |
| 388 |
|
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memset(r->buf, 0, r->buflen);
|
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r->len = r->req.cmd.xfer; |
| 391 |
if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
|
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r->len = 0;
|
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return -r->req.cmd.xfer;
|
| 394 |
} else {
|
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return r->req.cmd.xfer;
|
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} |
| 397 |
} |
| 398 |
|
| 399 |
static int get_blocksize(BlockDriverState *bdrv) |
| 400 |
{
|
| 401 |
uint8_t cmd[10];
|
| 402 |
uint8_t buf[8];
|
| 403 |
uint8_t sensebuf[8];
|
| 404 |
sg_io_hdr_t io_header; |
| 405 |
int ret;
|
| 406 |
|
| 407 |
memset(cmd, 0, sizeof(cmd)); |
| 408 |
memset(buf, 0, sizeof(buf)); |
| 409 |
cmd[0] = READ_CAPACITY;
|
| 410 |
|
| 411 |
memset(&io_header, 0, sizeof(io_header)); |
| 412 |
io_header.interface_id = 'S';
|
| 413 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
| 414 |
io_header.dxfer_len = sizeof(buf);
|
| 415 |
io_header.dxferp = buf; |
| 416 |
io_header.cmdp = cmd; |
| 417 |
io_header.cmd_len = sizeof(cmd);
|
| 418 |
io_header.mx_sb_len = sizeof(sensebuf);
|
| 419 |
io_header.sbp = sensebuf; |
| 420 |
io_header.timeout = 6000; /* XXX */ |
| 421 |
|
| 422 |
ret = bdrv_ioctl(bdrv, SG_IO, &io_header); |
| 423 |
if (ret < 0) |
| 424 |
return -1; |
| 425 |
|
| 426 |
return (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; |
| 427 |
} |
| 428 |
|
| 429 |
static int get_stream_blocksize(BlockDriverState *bdrv) |
| 430 |
{
|
| 431 |
uint8_t cmd[6];
|
| 432 |
uint8_t buf[12];
|
| 433 |
uint8_t sensebuf[8];
|
| 434 |
sg_io_hdr_t io_header; |
| 435 |
int ret;
|
| 436 |
|
| 437 |
memset(cmd, 0, sizeof(cmd)); |
| 438 |
memset(buf, 0, sizeof(buf)); |
| 439 |
cmd[0] = MODE_SENSE;
|
| 440 |
cmd[4] = sizeof(buf); |
| 441 |
|
| 442 |
memset(&io_header, 0, sizeof(io_header)); |
| 443 |
io_header.interface_id = 'S';
|
| 444 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
| 445 |
io_header.dxfer_len = sizeof(buf);
|
| 446 |
io_header.dxferp = buf; |
| 447 |
io_header.cmdp = cmd; |
| 448 |
io_header.cmd_len = sizeof(cmd);
|
| 449 |
io_header.mx_sb_len = sizeof(sensebuf);
|
| 450 |
io_header.sbp = sensebuf; |
| 451 |
io_header.timeout = 6000; /* XXX */ |
| 452 |
|
| 453 |
ret = bdrv_ioctl(bdrv, SG_IO, &io_header); |
| 454 |
if (ret < 0) |
| 455 |
return -1; |
| 456 |
|
| 457 |
return (buf[9] << 16) | (buf[10] << 8) | buf[11]; |
| 458 |
} |
| 459 |
|
| 460 |
static void scsi_generic_reset(DeviceState *dev) |
| 461 |
{
|
| 462 |
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev.qdev, dev); |
| 463 |
|
| 464 |
scsi_device_purge_requests(&s->qdev); |
| 465 |
} |
| 466 |
|
| 467 |
static void scsi_destroy(SCSIDevice *d) |
| 468 |
{
|
| 469 |
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d); |
| 470 |
|
| 471 |
scsi_device_purge_requests(&s->qdev); |
| 472 |
blockdev_mark_auto_del(s->qdev.conf.bs); |
| 473 |
} |
| 474 |
|
| 475 |
static int scsi_generic_initfn(SCSIDevice *dev) |
| 476 |
{
|
| 477 |
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, dev); |
| 478 |
int sg_version;
|
| 479 |
struct sg_scsi_id scsiid;
|
| 480 |
|
| 481 |
if (!s->qdev.conf.bs) {
|
| 482 |
error_report("scsi-generic: drive property not set");
|
| 483 |
return -1; |
| 484 |
} |
| 485 |
s->bs = s->qdev.conf.bs; |
| 486 |
|
| 487 |
/* check we are really using a /dev/sg* file */
|
| 488 |
if (!bdrv_is_sg(s->bs)) {
|
| 489 |
error_report("scsi-generic: not /dev/sg*");
|
| 490 |
return -1; |
| 491 |
} |
| 492 |
|
| 493 |
if (bdrv_get_on_error(s->bs, 0) != BLOCK_ERR_STOP_ENOSPC) { |
| 494 |
error_report("Device doesn't support drive option werror");
|
| 495 |
return -1; |
| 496 |
} |
| 497 |
if (bdrv_get_on_error(s->bs, 1) != BLOCK_ERR_REPORT) { |
| 498 |
error_report("Device doesn't support drive option rerror");
|
| 499 |
return -1; |
| 500 |
} |
| 501 |
|
| 502 |
/* check we are using a driver managing SG_IO (version 3 and after */
|
| 503 |
if (bdrv_ioctl(s->bs, SG_GET_VERSION_NUM, &sg_version) < 0 || |
| 504 |
sg_version < 30000) {
|
| 505 |
error_report("scsi-generic: scsi generic interface too old");
|
| 506 |
return -1; |
| 507 |
} |
| 508 |
|
| 509 |
/* get LUN of the /dev/sg? */
|
| 510 |
if (bdrv_ioctl(s->bs, SG_GET_SCSI_ID, &scsiid)) {
|
| 511 |
error_report("scsi-generic: SG_GET_SCSI_ID ioctl failed");
|
| 512 |
return -1; |
| 513 |
} |
| 514 |
|
| 515 |
/* define device state */
|
| 516 |
s->lun = scsiid.lun; |
| 517 |
DPRINTF("LUN %d\n", s->lun);
|
| 518 |
s->qdev.type = scsiid.scsi_type; |
| 519 |
DPRINTF("device type %d\n", s->qdev.type);
|
| 520 |
if (s->qdev.type == TYPE_TAPE) {
|
| 521 |
s->qdev.blocksize = get_stream_blocksize(s->bs); |
| 522 |
if (s->qdev.blocksize == -1) |
| 523 |
s->qdev.blocksize = 0;
|
| 524 |
} else {
|
| 525 |
s->qdev.blocksize = get_blocksize(s->bs); |
| 526 |
/* removable media returns 0 if not present */
|
| 527 |
if (s->qdev.blocksize <= 0) { |
| 528 |
if (s->qdev.type == TYPE_ROM || s->qdev.type == TYPE_WORM)
|
| 529 |
s->qdev.blocksize = 2048;
|
| 530 |
else
|
| 531 |
s->qdev.blocksize = 512;
|
| 532 |
} |
| 533 |
} |
| 534 |
DPRINTF("block size %d\n", s->qdev.blocksize);
|
| 535 |
s->driver_status = 0;
|
| 536 |
memset(s->sensebuf, 0, sizeof(s->sensebuf)); |
| 537 |
bdrv_set_removable(s->bs, 0);
|
| 538 |
return 0; |
| 539 |
} |
| 540 |
|
| 541 |
static SCSIDeviceInfo scsi_generic_info = {
|
| 542 |
.qdev.name = "scsi-generic",
|
| 543 |
.qdev.desc = "pass through generic scsi device (/dev/sg*)",
|
| 544 |
.qdev.size = sizeof(SCSIGenericState),
|
| 545 |
.qdev.reset = scsi_generic_reset, |
| 546 |
.init = scsi_generic_initfn, |
| 547 |
.destroy = scsi_destroy, |
| 548 |
.alloc_req = scsi_new_request, |
| 549 |
.free_req = scsi_free_request, |
| 550 |
.send_command = scsi_send_command, |
| 551 |
.read_data = scsi_read_data, |
| 552 |
.write_data = scsi_write_data, |
| 553 |
.cancel_io = scsi_cancel_io, |
| 554 |
.get_buf = scsi_get_buf, |
| 555 |
.get_sense = scsi_get_sense, |
| 556 |
.qdev.props = (Property[]) {
|
| 557 |
DEFINE_BLOCK_PROPERTIES(SCSIGenericState, qdev.conf), |
| 558 |
DEFINE_PROP_END_OF_LIST(), |
| 559 |
}, |
| 560 |
}; |
| 561 |
|
| 562 |
static void scsi_generic_register_devices(void) |
| 563 |
{
|
| 564 |
scsi_qdev_register(&scsi_generic_info); |
| 565 |
} |
| 566 |
device_init(scsi_generic_register_devices) |
| 567 |
|
| 568 |
#endif /* __linux__ */ |