This will let scsi-block choose between passthrough and emulation. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
463 lines
12 KiB
C
463 lines
12 KiB
C
/*
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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 licensed 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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#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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#ifndef MAX_UINT
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#define MAX_UINT ((unsigned int)-1)
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#endif
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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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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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g_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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int status;
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SCSIGenericReq *r = (SCSIGenericReq *)opaque;
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r->req.aiocb = NULL;
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if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
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r->req.sense_len = r->io_header.sb_len_wr;
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}
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if (ret != 0) {
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switch (ret) {
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case -EDOM:
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status = TASK_SET_FULL;
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break;
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case -ENOMEM:
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status = CHECK_CONDITION;
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scsi_req_build_sense(&r->req, SENSE_CODE(TARGET_FAILURE));
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break;
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default:
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status = CHECK_CONDITION;
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scsi_req_build_sense(&r->req, SENSE_CODE(IO_ERROR));
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break;
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}
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} else {
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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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status = BUSY;
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BADF("Driver Timeout\n");
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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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} else if (r->io_header.status) {
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status = r->io_header.status;
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} else if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
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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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}
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DPRINTF("Command complete 0x%p tag=0x%x status=%d\n",
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r, r->req.tag, status);
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scsi_req_complete(&r->req, status);
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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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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(r->req.sense);
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r->io_header.sbp = r->req.sense;
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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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SCSIDevice *s = r->req.dev;
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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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/* 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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s->max_lba = ldl_be_p(&r->buf[0]);
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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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s->max_lba = ldq_be_p(&r->buf[0]);
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}
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bdrv_set_buffer_alignment(s->conf.bs, s->blocksize);
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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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SCSIDevice *s = 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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ret = execute_command(s->conf.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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}
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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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SCSIDevice *s = 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->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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}
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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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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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SCSIDevice *s = r->req.dev;
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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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ret = execute_command(s->conf.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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/* 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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/* 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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SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
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SCSIDevice *s = r->req.dev;
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int ret;
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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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#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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if (r->req.cmd.xfer == 0) {
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if (r->buf != NULL)
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g_free(r->buf);
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r->buflen = 0;
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r->buf = NULL;
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ret = execute_command(s->conf.bs, r, SG_DXFER_NONE, scsi_command_complete);
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if (ret < 0) {
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scsi_command_complete(r, ret);
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return 0;
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}
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return 0;
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}
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if (r->buflen != r->req.cmd.xfer) {
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if (r->buf != NULL)
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g_free(r->buf);
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r->buf = g_malloc(r->req.cmd.xfer);
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r->buflen = r->req.cmd.xfer;
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}
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memset(r->buf, 0, r->buflen);
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r->len = r->req.cmd.xfer;
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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;
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} else {
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return r->req.cmd.xfer;
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}
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}
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static int get_stream_blocksize(BlockDriverState *bdrv)
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{
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uint8_t cmd[6];
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uint8_t buf[12];
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uint8_t sensebuf[8];
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sg_io_hdr_t io_header;
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int ret;
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memset(cmd, 0, sizeof(cmd));
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memset(buf, 0, sizeof(buf));
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cmd[0] = MODE_SENSE;
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cmd[4] = sizeof(buf);
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memset(&io_header, 0, sizeof(io_header));
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io_header.interface_id = 'S';
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io_header.dxfer_direction = SG_DXFER_FROM_DEV;
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io_header.dxfer_len = sizeof(buf);
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io_header.dxferp = buf;
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io_header.cmdp = cmd;
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io_header.cmd_len = sizeof(cmd);
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io_header.mx_sb_len = sizeof(sensebuf);
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io_header.sbp = sensebuf;
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io_header.timeout = 6000; /* XXX */
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ret = bdrv_ioctl(bdrv, SG_IO, &io_header);
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if (ret < 0 || io_header.driver_status || io_header.host_status) {
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return -1;
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}
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return (buf[9] << 16) | (buf[10] << 8) | buf[11];
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}
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static void scsi_generic_reset(DeviceState *dev)
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{
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SCSIDevice *s = DO_UPCAST(SCSIDevice, qdev, dev);
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scsi_device_purge_requests(s, SENSE_CODE(RESET));
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}
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static void scsi_destroy(SCSIDevice *s)
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{
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scsi_device_purge_requests(s, SENSE_CODE(NO_SENSE));
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blockdev_mark_auto_del(s->conf.bs);
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}
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static int scsi_generic_initfn(SCSIDevice *s)
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{
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int sg_version;
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struct sg_scsi_id scsiid;
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if (!s->conf.bs) {
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error_report("scsi-generic: drive property not set");
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return -1;
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}
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/* check we are really using a /dev/sg* file */
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if (!bdrv_is_sg(s->conf.bs)) {
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error_report("scsi-generic: not /dev/sg*");
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return -1;
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}
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if (bdrv_get_on_error(s->conf.bs, 0) != BLOCK_ERR_STOP_ENOSPC) {
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error_report("Device doesn't support drive option werror");
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return -1;
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}
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if (bdrv_get_on_error(s->conf.bs, 1) != BLOCK_ERR_REPORT) {
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error_report("Device doesn't support drive option rerror");
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return -1;
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}
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/* check we are using a driver managing SG_IO (version 3 and after */
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if (bdrv_ioctl(s->conf.bs, SG_GET_VERSION_NUM, &sg_version) < 0 ||
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sg_version < 30000) {
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error_report("scsi-generic: scsi generic interface too old");
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return -1;
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}
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/* get LUN of the /dev/sg? */
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if (bdrv_ioctl(s->conf.bs, SG_GET_SCSI_ID, &scsiid)) {
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error_report("scsi-generic: SG_GET_SCSI_ID ioctl failed");
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return -1;
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}
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/* define device state */
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s->type = scsiid.scsi_type;
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DPRINTF("device type %d\n", s->type);
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switch (s->type) {
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case TYPE_TAPE:
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s->blocksize = get_stream_blocksize(s->conf.bs);
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if (s->blocksize == -1) {
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s->blocksize = 0;
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}
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break;
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/* Make a guess for block devices, we'll fix it when the guest sends.
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* READ CAPACITY. If they don't, they likely would assume these sizes
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* anyway. (TODO: they could also send MODE SENSE).
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*/
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case TYPE_ROM:
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case TYPE_WORM:
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s->blocksize = 2048;
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break;
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default:
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s->blocksize = 512;
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break;
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}
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DPRINTF("block size %d\n", s->blocksize);
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return 0;
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}
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const SCSIReqOps scsi_generic_req_ops = {
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.size = sizeof(SCSIGenericReq),
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.free_req = scsi_free_request,
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.send_command = scsi_send_command,
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.read_data = scsi_read_data,
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.write_data = scsi_write_data,
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.cancel_io = scsi_cancel_io,
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.get_buf = scsi_get_buf,
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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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uint8_t *buf, void *hba_private)
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{
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SCSIRequest *req;
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req = scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
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return req;
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}
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static SCSIDeviceInfo scsi_generic_info = {
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.qdev.name = "scsi-generic",
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.qdev.desc = "pass through generic scsi device (/dev/sg*)",
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.qdev.size = sizeof(SCSIDevice),
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.qdev.reset = scsi_generic_reset,
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.init = scsi_generic_initfn,
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.destroy = scsi_destroy,
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.alloc_req = scsi_new_request,
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.qdev.props = (Property[]) {
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DEFINE_BLOCK_PROPERTIES(SCSIDevice, conf),
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DEFINE_PROP_END_OF_LIST(),
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},
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};
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static void scsi_generic_register_devices(void)
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{
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scsi_qdev_register(&scsi_generic_info);
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}
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device_init(scsi_generic_register_devices)
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#endif /* __linux__ */
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