2007-12-24 17:11:51 +01:00
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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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2011-06-26 04:21:35 +02:00
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* This code is licensed under the LGPL.
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2007-12-24 17:11:51 +01:00
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*
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*/
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#include "qemu-common.h"
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2010-02-18 16:24:31 +01:00
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#include "qemu-error.h"
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2009-10-30 09:54:00 +01:00
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#include "scsi.h"
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2010-08-24 17:22:24 +02:00
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#include "blockdev.h"
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2007-12-24 17:11:51 +01:00
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2009-08-31 14:24:04 +02:00
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#ifdef __linux__
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2007-12-24 17:11:51 +01:00
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//#define DEBUG_SCSI
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#ifdef DEBUG_SCSI
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2009-05-13 19:53:17 +02:00
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#define DPRINTF(fmt, ...) \
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do { printf("scsi-generic: " fmt , ## __VA_ARGS__); } while (0)
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2007-12-24 17:11:51 +01:00
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#else
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2009-05-13 19:53:17 +02:00
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#define DPRINTF(fmt, ...) do {} while(0)
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2007-12-24 17:11:51 +01:00
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#endif
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2009-05-13 19:53:17 +02:00
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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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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:53 +01:00
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#include "scsi-defs.h"
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2007-12-24 17:11:51 +01:00
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2008-09-23 15:38:44 +02:00
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#define SCSI_SENSE_BUF_SIZE 96
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2007-12-24 17:11:51 +01:00
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2011-10-12 14:53:43 +02:00
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#define SG_ERR_DRIVER_TIMEOUT 0x06
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#define SG_ERR_DRIVER_SENSE 0x08
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#define SG_ERR_DID_OK 0x00
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#define SG_ERR_DID_NO_CONNECT 0x01
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#define SG_ERR_DID_BUS_BUSY 0x02
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#define SG_ERR_DID_TIME_OUT 0x03
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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:48 +01:00
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typedef struct SCSIGenericReq {
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SCSIRequest req;
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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:48 +01:00
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} SCSIGenericReq;
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2007-12-24 17:11:51 +01:00
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2011-12-15 13:24:30 +01:00
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static void scsi_generic_save_request(QEMUFile *f, SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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qemu_put_sbe32s(f, &r->buflen);
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if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) {
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assert(!r->req.sg);
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qemu_put_buffer(f, r->buf, r->req.cmd.xfer);
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}
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}
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static void scsi_generic_load_request(QEMUFile *f, SCSIRequest *req)
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{
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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qemu_get_sbe32s(f, &r->buflen);
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if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) {
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assert(!r->req.sg);
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qemu_get_buffer(f, r->buf, r->req.cmd.xfer);
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}
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}
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2011-04-18 16:01:56 +02:00
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static void scsi_free_request(SCSIRequest *req)
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2007-12-24 17:11:51 +01:00
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{
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2011-04-18 16:01:56 +02:00
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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2011-08-21 05:09:37 +02:00
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g_free(r->buf);
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2007-12-24 17:11:51 +01:00
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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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2011-08-03 10:49:06 +02:00
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int status;
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2009-11-26 15:33:48 +01:00
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SCSIGenericReq *r = (SCSIGenericReq *)opaque;
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2007-12-24 17:11:51 +01:00
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2011-05-25 16:53:46 +02:00
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r->req.aiocb = NULL;
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2011-10-12 14:53:43 +02:00
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if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
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2011-08-03 10:49:07 +02:00
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r->req.sense_len = r->io_header.sb_len_wr;
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2011-10-12 14:53:43 +02:00
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}
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2008-10-17 10:08:56 +02:00
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2011-04-18 12:53:14 +02:00
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if (ret != 0) {
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switch (ret) {
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2011-04-18 14:29:16 +02:00
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case -EDOM:
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2011-08-03 10:49:06 +02:00
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status = TASK_SET_FULL;
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2011-04-18 14:29:16 +02:00
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break;
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2011-04-18 12:53:14 +02:00
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case -ENOMEM:
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2011-08-03 10:49:06 +02:00
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status = CHECK_CONDITION;
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2011-08-03 10:49:07 +02:00
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scsi_req_build_sense(&r->req, SENSE_CODE(TARGET_FAILURE));
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2011-04-18 12:53:14 +02:00
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break;
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default:
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2011-08-03 10:49:06 +02:00
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status = CHECK_CONDITION;
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2011-08-03 10:49:07 +02:00
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scsi_req_build_sense(&r->req, SENSE_CODE(IO_ERROR));
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2011-04-18 12:53:14 +02:00
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break;
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}
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} else {
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2011-10-12 14:53:43 +02:00
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if (r->io_header.host_status == SG_ERR_DID_NO_CONNECT ||
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r->io_header.host_status == SG_ERR_DID_BUS_BUSY ||
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r->io_header.host_status == SG_ERR_DID_TIME_OUT ||
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(r->io_header.driver_status & SG_ERR_DRIVER_TIMEOUT)) {
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2011-08-03 10:49:06 +02:00
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status = BUSY;
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2007-12-24 17:11:51 +01:00
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BADF("Driver Timeout\n");
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2011-10-12 14:53:43 +02:00
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} else if (r->io_header.host_status) {
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status = CHECK_CONDITION;
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scsi_req_build_sense(&r->req, SENSE_CODE(I_T_NEXUS_LOSS));
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2011-08-03 10:49:06 +02:00
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} else if (r->io_header.status) {
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status = r->io_header.status;
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2011-08-03 10:49:07 +02:00
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} else if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
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2011-08-03 10:49:06 +02:00
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status = CHECK_CONDITION;
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} else {
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status = GOOD;
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}
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2007-12-24 17:11:51 +01:00
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}
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2008-10-17 10:08:56 +02:00
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DPRINTF("Command complete 0x%p tag=0x%x status=%d\n",
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2011-08-03 10:49:06 +02:00
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r, r->req.tag, status);
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2009-11-26 15:34:00 +01:00
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2011-08-03 10:49:06 +02:00
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scsi_req_complete(&r->req, status);
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2011-10-25 12:53:35 +02:00
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if (!r->req.io_canceled) {
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scsi_req_unref(&r->req);
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}
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2007-12-24 17:11:51 +01:00
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}
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/* Cancel a pending data transfer. */
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2011-04-18 12:35:39 +02:00
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static void scsi_cancel_io(SCSIRequest *req)
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2007-12-24 17:11:51 +01:00
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{
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2011-04-18 12:35:39 +02:00
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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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2011-10-25 12:53:35 +02:00
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/* This reference was left in by scsi_*_data. We take ownership of
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* it independent of whether bdrv_aio_cancel completes the request
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* or not. */
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scsi_req_unref(&r->req);
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2007-12-24 17:11:51 +01:00
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}
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2011-04-18 12:35:39 +02:00
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r->req.aiocb = NULL;
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2007-12-24 17:11:51 +01:00
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}
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static int execute_command(BlockDriverState *bdrv,
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2009-11-26 15:33:48 +01:00
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SCSIGenericReq *r, int direction,
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2007-12-24 17:11:51 +01:00
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BlockDriverCompletionFunc *complete)
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{
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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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2009-11-26 15:33:51 +01:00
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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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2011-08-03 10:49:07 +02:00
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r->io_header.mx_sb_len = sizeof(r->req.sense);
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r->io_header.sbp = r->req.sense;
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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:48 +01:00
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r->req.aiocb = bdrv_aio_ioctl(bdrv, SG_IO, &r->io_header, complete, r);
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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:48 +01:00
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SCSIGenericReq *r = (SCSIGenericReq *)opaque;
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2011-10-13 10:36:27 +02:00
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SCSIDevice *s = r->req.dev;
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2007-12-24 17:11:51 +01:00
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int len;
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2011-05-25 16:53:46 +02:00
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r->req.aiocb = NULL;
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2007-12-24 17:11:51 +01:00
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if (ret) {
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2010-09-01 16:33:21 +02:00
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DPRINTF("IO error ret %d\n", ret);
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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:48 +01:00
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DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, len);
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2007-12-24 17:11:51 +01:00
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r->len = -1;
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2011-05-03 14:15:59 +02:00
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if (len == 0) {
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2008-10-17 10:08:56 +02:00
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scsi_command_complete(r, 0);
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2011-05-03 14:15:59 +02:00
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} else {
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2011-10-13 10:36:27 +02:00
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/* Snoop READ CAPACITY output to set the blocksize. */
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if (r->req.cmd.buf[0] == READ_CAPACITY_10) {
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s->blocksize = ldl_be_p(&r->buf[4]);
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2011-10-13 10:39:50 +02:00
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s->max_lba = ldl_be_p(&r->buf[0]);
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2011-10-13 10:36:27 +02:00
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} else if (r->req.cmd.buf[0] == SERVICE_ACTION_IN_16 &&
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(r->req.cmd.buf[1] & 31) == SAI_READ_CAPACITY_16) {
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s->blocksize = ldl_be_p(&r->buf[8]);
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2011-10-13 10:39:50 +02:00
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s->max_lba = ldq_be_p(&r->buf[0]);
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2011-10-13 10:36:27 +02:00
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}
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bdrv_set_buffer_alignment(s->conf.bs, s->blocksize);
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2011-04-18 14:59:13 +02:00
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scsi_req_data(&r->req, len);
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2011-10-25 12:53:35 +02:00
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if (!r->req.io_canceled) {
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scsi_req_unref(&r->req);
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}
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2011-05-03 14:15:59 +02:00
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}
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2007-12-24 17:11:51 +01:00
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}
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/* Read more data from scsi device into buffer. */
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2011-04-18 12:35:39 +02:00
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static void scsi_read_data(SCSIRequest *req)
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2007-12-24 17:11:51 +01:00
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{
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2011-04-18 12:35:39 +02:00
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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2011-10-12 12:49:35 +02:00
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SCSIDevice *s = r->req.dev;
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2007-12-24 17:11:51 +01:00
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int ret;
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2011-04-18 12:35:39 +02:00
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DPRINTF("scsi_read_data 0x%x\n", req->tag);
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2011-10-25 12:53:35 +02:00
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/* The request is used as the AIO opaque value, so add a ref. */
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scsi_req_ref(&r->req);
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2007-12-24 17:11:51 +01:00
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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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2011-10-12 12:49:35 +02:00
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ret = execute_command(s->conf.bs, r, SG_DXFER_FROM_DEV, scsi_read_complete);
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2011-04-18 12:53:14 +02:00
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if (ret < 0) {
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scsi_command_complete(r, ret);
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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:48 +01:00
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SCSIGenericReq *r = (SCSIGenericReq *)opaque;
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2011-10-12 12:49:35 +02:00
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SCSIDevice *s = r->req.dev;
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2007-12-24 17:11:51 +01:00
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DPRINTF("scsi_write_complete() ret = %d\n", ret);
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2011-05-25 16:53:46 +02:00
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r->req.aiocb = NULL;
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2007-12-24 17:11:51 +01:00
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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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2009-11-26 15:33:51 +01:00
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if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 &&
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2011-10-12 12:49:35 +02:00
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s->type == TYPE_TAPE) {
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s->blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11];
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DPRINTF("block size %d\n", s->blocksize);
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2008-10-17 10:08:56 +02:00
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}
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2007-12-24 17:11:51 +01:00
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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. */
|
2011-04-22 09:39:16 +02:00
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static void scsi_write_data(SCSIRequest *req)
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2007-12-24 17:11:51 +01:00
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{
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2011-04-18 12:35:39 +02:00
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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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2011-10-12 12:49:35 +02:00
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SCSIDevice *s = r->req.dev;
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2007-12-24 17:11:51 +01:00
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int ret;
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|
2011-04-18 12:35:39 +02:00
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|
|
DPRINTF("scsi_write_data 0x%x\n", req->tag);
|
2007-12-24 17:11:51 +01:00
|
|
|
if (r->len == 0) {
|
|
|
|
r->len = r->buflen;
|
2011-04-18 14:59:13 +02:00
|
|
|
scsi_req_data(&r->req, r->len);
|
2011-04-22 09:39:16 +02:00
|
|
|
return;
|
2007-12-24 17:11:51 +01:00
|
|
|
}
|
|
|
|
|
2011-10-25 12:53:35 +02:00
|
|
|
/* The request is used as the AIO opaque value, so add a ref. */
|
|
|
|
scsi_req_ref(&r->req);
|
2011-10-12 12:49:35 +02:00
|
|
|
ret = execute_command(s->conf.bs, r, SG_DXFER_TO_DEV, scsi_write_complete);
|
2011-04-18 12:53:14 +02:00
|
|
|
if (ret < 0) {
|
|
|
|
scsi_command_complete(r, ret);
|
2007-12-24 17:11:51 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return a pointer to the data buffer. */
|
2011-04-18 12:35:39 +02:00
|
|
|
static uint8_t *scsi_get_buf(SCSIRequest *req)
|
2007-12-24 17:11:51 +01:00
|
|
|
{
|
2011-04-18 12:35:39 +02:00
|
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
|
|
|
|
2007-12-24 17:11:51 +01:00
|
|
|
return r->buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Execute a scsi command. Returns the length of the data expected by the
|
|
|
|
command. This will be Positive for data transfers from the device
|
|
|
|
(eg. disk reads), negative for transfers to the device (eg. disk writes),
|
|
|
|
and zero if the command does not transfer any data. */
|
|
|
|
|
2011-04-18 12:35:39 +02:00
|
|
|
static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
|
2007-12-24 17:11:51 +01:00
|
|
|
{
|
2011-04-18 12:35:39 +02:00
|
|
|
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
|
2011-10-12 12:49:35 +02:00
|
|
|
SCSIDevice *s = r->req.dev;
|
2007-12-24 17:11:51 +01:00
|
|
|
int ret;
|
|
|
|
|
2010-09-01 16:33:21 +02:00
|
|
|
DPRINTF("Command: lun=%d tag=0x%x len %zd data=0x%02x", lun, tag,
|
|
|
|
r->req.cmd.xfer, cmd[0]);
|
|
|
|
|
|
|
|
#ifdef DEBUG_SCSI
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
for (i = 1; i < r->req.cmd.len; i++) {
|
|
|
|
printf(" 0x%02x", cmd[i]);
|
|
|
|
}
|
|
|
|
printf("\n");
|
|
|
|
}
|
|
|
|
#endif
|
2007-12-24 17:11:51 +01:00
|
|
|
|
2009-11-26 15:33:55 +01:00
|
|
|
if (r->req.cmd.xfer == 0) {
|
2007-12-24 17:11:51 +01:00
|
|
|
if (r->buf != NULL)
|
2011-08-21 05:09:37 +02:00
|
|
|
g_free(r->buf);
|
2007-12-24 17:11:51 +01:00
|
|
|
r->buflen = 0;
|
|
|
|
r->buf = NULL;
|
2011-10-25 12:53:35 +02:00
|
|
|
/* The request is used as the AIO opaque value, so add a ref. */
|
|
|
|
scsi_req_ref(&r->req);
|
2011-10-12 12:49:35 +02:00
|
|
|
ret = execute_command(s->conf.bs, r, SG_DXFER_NONE, scsi_command_complete);
|
2011-04-18 12:53:14 +02:00
|
|
|
if (ret < 0) {
|
|
|
|
scsi_command_complete(r, ret);
|
|
|
|
return 0;
|
2007-12-24 17:11:51 +01:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2009-11-26 15:33:55 +01:00
|
|
|
if (r->buflen != r->req.cmd.xfer) {
|
2007-12-24 17:11:51 +01:00
|
|
|
if (r->buf != NULL)
|
2011-08-21 05:09:37 +02:00
|
|
|
g_free(r->buf);
|
|
|
|
r->buf = g_malloc(r->req.cmd.xfer);
|
2009-11-26 15:33:55 +01:00
|
|
|
r->buflen = r->req.cmd.xfer;
|
2007-12-24 17:11:51 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
memset(r->buf, 0, r->buflen);
|
2009-11-26 15:33:55 +01:00
|
|
|
r->len = r->req.cmd.xfer;
|
2009-11-26 15:33:57 +01:00
|
|
|
if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
|
2007-12-24 17:11:51 +01:00
|
|
|
r->len = 0;
|
2011-04-18 12:35:39 +02:00
|
|
|
return -r->req.cmd.xfer;
|
2011-04-18 16:01:56 +02:00
|
|
|
} else {
|
2011-04-18 12:35:39 +02:00
|
|
|
return r->req.cmd.xfer;
|
2007-12-24 17:11:51 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-10-17 10:08:56 +02:00
|
|
|
static int get_stream_blocksize(BlockDriverState *bdrv)
|
|
|
|
{
|
|
|
|
uint8_t cmd[6];
|
|
|
|
uint8_t buf[12];
|
|
|
|
uint8_t sensebuf[8];
|
|
|
|
sg_io_hdr_t io_header;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
|
|
cmd[0] = MODE_SENSE;
|
|
|
|
cmd[4] = sizeof(buf);
|
|
|
|
|
|
|
|
memset(&io_header, 0, sizeof(io_header));
|
|
|
|
io_header.interface_id = 'S';
|
|
|
|
io_header.dxfer_direction = SG_DXFER_FROM_DEV;
|
|
|
|
io_header.dxfer_len = sizeof(buf);
|
|
|
|
io_header.dxferp = buf;
|
|
|
|
io_header.cmdp = cmd;
|
|
|
|
io_header.cmd_len = sizeof(cmd);
|
|
|
|
io_header.mx_sb_len = sizeof(sensebuf);
|
|
|
|
io_header.sbp = sensebuf;
|
|
|
|
io_header.timeout = 6000; /* XXX */
|
|
|
|
|
2009-03-28 18:28:41 +01:00
|
|
|
ret = bdrv_ioctl(bdrv, SG_IO, &io_header);
|
2011-10-12 14:49:48 +02:00
|
|
|
if (ret < 0 || io_header.driver_status || io_header.host_status) {
|
2008-10-17 10:08:56 +02:00
|
|
|
return -1;
|
2011-10-12 14:49:48 +02:00
|
|
|
}
|
2008-10-17 10:08:56 +02:00
|
|
|
return (buf[9] << 16) | (buf[10] << 8) | buf[11];
|
|
|
|
}
|
|
|
|
|
2010-09-06 16:07:33 +02:00
|
|
|
static void scsi_generic_reset(DeviceState *dev)
|
|
|
|
{
|
2011-12-15 21:50:08 +01:00
|
|
|
SCSIDevice *s = SCSI_DEVICE(dev);
|
2010-09-06 16:07:33 +02:00
|
|
|
|
2011-10-12 12:49:35 +02:00
|
|
|
scsi_device_purge_requests(s, SENSE_CODE(RESET));
|
2010-09-06 16:07:33 +02:00
|
|
|
}
|
|
|
|
|
2011-10-12 12:49:35 +02:00
|
|
|
static void scsi_destroy(SCSIDevice *s)
|
2010-09-06 16:07:33 +02:00
|
|
|
{
|
2011-10-12 12:49:35 +02:00
|
|
|
scsi_device_purge_requests(s, SENSE_CODE(NO_SENSE));
|
|
|
|
blockdev_mark_auto_del(s->conf.bs);
|
2007-12-24 17:11:51 +01:00
|
|
|
}
|
|
|
|
|
2011-10-12 12:49:35 +02:00
|
|
|
static int scsi_generic_initfn(SCSIDevice *s)
|
2007-12-24 17:11:51 +01:00
|
|
|
{
|
|
|
|
int sg_version;
|
|
|
|
struct sg_scsi_id scsiid;
|
|
|
|
|
2011-10-12 12:49:35 +02:00
|
|
|
if (!s->conf.bs) {
|
2011-12-21 11:37:57 +01:00
|
|
|
error_report("drive property not set");
|
2009-08-31 14:24:04 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2007-12-24 17:11:51 +01:00
|
|
|
|
2011-10-12 12:49:35 +02:00
|
|
|
if (bdrv_get_on_error(s->conf.bs, 0) != BLOCK_ERR_STOP_ENOSPC) {
|
2010-05-27 20:02:28 +02:00
|
|
|
error_report("Device doesn't support drive option werror");
|
|
|
|
return -1;
|
|
|
|
}
|
2011-10-12 12:49:35 +02:00
|
|
|
if (bdrv_get_on_error(s->conf.bs, 1) != BLOCK_ERR_REPORT) {
|
2010-05-27 20:02:28 +02:00
|
|
|
error_report("Device doesn't support drive option rerror");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2007-12-24 17:11:51 +01:00
|
|
|
/* check we are using a driver managing SG_IO (version 3 and after */
|
ISCSI: Add SCSI passthrough via scsi-generic to libiscsi
Update iscsi to allow passthrough of SG_IO scsi commands when the iscsi
device is forced to be scsi-generic.
Implement both bdrv_ioctl() and bdrv_aio_ioctl() in the iscsi backend,
emulate the SG_IO ioctl and pass the SCSI commands across to the
iscsi target.
This allows end-to-end passthrough of SCSI all the way from the guest,
to qemu, via scsi-generic, then libiscsi all the way to the iscsi target.
To activate this you need to specify that the iscsi lun should be treated
as a scsi-generic device.
Example:
-device lsi -device scsi-generic,drive=MyISCSI \
-drive file=iscsi://10.1.1.125/iqn.ronnie.test/1,if=none,id=MyISCSI
Note, you can currently not boot a qemu guest from a scsi device.
Note,
This only works when the host is linux, since the emulation relies on
definitions of SG_IO from the scsi-generic implementation in the
linux kernel.
It should be fairly easy to re-implement some structures similar enough
for non-linux hosts to do the same style of passthrough via a fake
scsi generic layer and libiscsi if need be.
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-05-25 13:59:01 +02:00
|
|
|
if (bdrv_ioctl(s->conf.bs, SG_GET_VERSION_NUM, &sg_version) < 0) {
|
|
|
|
error_report("scsi generic interface not supported");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (sg_version < 30000) {
|
2011-12-21 11:37:57 +01:00
|
|
|
error_report("scsi generic interface too old");
|
2009-08-31 14:24:04 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2007-12-24 17:11:51 +01:00
|
|
|
|
|
|
|
/* get LUN of the /dev/sg? */
|
2011-10-12 12:49:35 +02:00
|
|
|
if (bdrv_ioctl(s->conf.bs, SG_GET_SCSI_ID, &scsiid)) {
|
2011-12-21 11:37:57 +01:00
|
|
|
error_report("SG_GET_SCSI_ID ioctl failed");
|
2009-08-31 14:24:04 +02:00
|
|
|
return -1;
|
|
|
|
}
|
2007-12-24 17:11:51 +01:00
|
|
|
|
|
|
|
/* define device state */
|
2011-10-12 12:49:35 +02:00
|
|
|
s->type = scsiid.scsi_type;
|
|
|
|
DPRINTF("device type %d\n", s->type);
|
2011-11-18 16:32:02 +01:00
|
|
|
if (s->type == TYPE_DISK || s->type == TYPE_ROM) {
|
|
|
|
add_boot_device_path(s->conf.bootindex, &s->qdev, NULL);
|
|
|
|
}
|
|
|
|
|
2011-10-13 10:36:27 +02:00
|
|
|
switch (s->type) {
|
|
|
|
case TYPE_TAPE:
|
2011-10-12 12:49:35 +02:00
|
|
|
s->blocksize = get_stream_blocksize(s->conf.bs);
|
|
|
|
if (s->blocksize == -1) {
|
|
|
|
s->blocksize = 0;
|
|
|
|
}
|
2011-10-13 10:36:27 +02:00
|
|
|
break;
|
|
|
|
|
|
|
|
/* Make a guess for block devices, we'll fix it when the guest sends.
|
|
|
|
* READ CAPACITY. If they don't, they likely would assume these sizes
|
|
|
|
* anyway. (TODO: they could also send MODE SENSE).
|
|
|
|
*/
|
|
|
|
case TYPE_ROM:
|
|
|
|
case TYPE_WORM:
|
|
|
|
s->blocksize = 2048;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
s->blocksize = 512;
|
|
|
|
break;
|
2008-10-17 10:08:56 +02:00
|
|
|
}
|
2011-10-12 12:49:35 +02:00
|
|
|
|
|
|
|
DPRINTF("block size %d\n", s->blocksize);
|
2009-08-31 14:24:04 +02:00
|
|
|
return 0;
|
|
|
|
}
|
2007-12-24 17:11:51 +01:00
|
|
|
|
2011-10-12 12:54:31 +02:00
|
|
|
const SCSIReqOps scsi_generic_req_ops = {
|
2011-08-03 10:49:08 +02:00
|
|
|
.size = sizeof(SCSIGenericReq),
|
2011-08-03 10:49:09 +02:00
|
|
|
.free_req = scsi_free_request,
|
|
|
|
.send_command = scsi_send_command,
|
|
|
|
.read_data = scsi_read_data,
|
|
|
|
.write_data = scsi_write_data,
|
|
|
|
.cancel_io = scsi_cancel_io,
|
|
|
|
.get_buf = scsi_get_buf,
|
2011-12-15 13:24:30 +01:00
|
|
|
.load_request = scsi_generic_load_request,
|
|
|
|
.save_request = scsi_generic_save_request,
|
2011-08-03 10:49:08 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun,
|
2011-10-12 12:58:31 +02:00
|
|
|
uint8_t *buf, void *hba_private)
|
2011-08-03 10:49:08 +02:00
|
|
|
{
|
|
|
|
SCSIRequest *req;
|
|
|
|
|
|
|
|
req = scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
|
|
|
|
return req;
|
|
|
|
}
|
|
|
|
|
2011-12-08 04:34:16 +01:00
|
|
|
static Property scsi_generic_properties[] = {
|
|
|
|
DEFINE_BLOCK_PROPERTIES(SCSIDevice, conf),
|
|
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
|
|
};
|
|
|
|
|
2011-12-15 21:50:08 +01:00
|
|
|
static void scsi_generic_class_initfn(ObjectClass *klass, void *data)
|
|
|
|
{
|
2011-12-08 04:34:16 +01:00
|
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
2011-12-15 21:50:08 +01:00
|
|
|
SCSIDeviceClass *sc = SCSI_DEVICE_CLASS(klass);
|
|
|
|
|
|
|
|
sc->init = scsi_generic_initfn;
|
|
|
|
sc->destroy = scsi_destroy;
|
|
|
|
sc->alloc_req = scsi_new_request;
|
2011-12-08 04:34:16 +01:00
|
|
|
dc->fw_name = "disk";
|
|
|
|
dc->desc = "pass through generic scsi device (/dev/sg*)";
|
|
|
|
dc->reset = scsi_generic_reset;
|
|
|
|
dc->props = scsi_generic_properties;
|
2011-12-15 13:24:30 +01:00
|
|
|
dc->vmsd = &vmstate_scsi_device;
|
2011-12-15 21:50:08 +01:00
|
|
|
}
|
|
|
|
|
2011-12-08 04:34:16 +01:00
|
|
|
static TypeInfo scsi_generic_info = {
|
|
|
|
.name = "scsi-generic",
|
|
|
|
.parent = TYPE_SCSI_DEVICE,
|
|
|
|
.instance_size = sizeof(SCSIDevice),
|
|
|
|
.class_init = scsi_generic_class_initfn,
|
2009-08-31 14:24:04 +02:00
|
|
|
};
|
2007-12-24 17:11:51 +01:00
|
|
|
|
2012-02-09 15:20:55 +01:00
|
|
|
static void scsi_generic_register_types(void)
|
2009-08-31 14:24:04 +02:00
|
|
|
{
|
2011-12-08 04:34:16 +01:00
|
|
|
type_register_static(&scsi_generic_info);
|
2007-12-24 17:11:51 +01:00
|
|
|
}
|
2012-02-09 15:20:55 +01:00
|
|
|
|
|
|
|
type_init(scsi_generic_register_types)
|
2009-08-31 14:24:04 +02:00
|
|
|
|
2007-12-24 17:11:51 +01:00
|
|
|
#endif /* __linux__ */
|