Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
693 lines
18 KiB
C
693 lines
18 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 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 "block.h"
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#include "scsi.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/scsi.h>
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#define REWIND 0x01
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#define REPORT_DENSITY_SUPPORT 0x44
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#define LOAD_UNLOAD 0xa6
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#define SET_CD_SPEED 0xbb
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#define BLANK 0xa1
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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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#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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DriveInfo *dinfo;
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int type;
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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 SCSIGenericReq *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 DO_UPCAST(SCSIGenericReq, req, req);
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}
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static void scsi_remove_request(SCSIGenericReq *r)
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{
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qemu_free(r->buf);
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scsi_req_free(&r->req);
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}
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static SCSIGenericReq *scsi_find_request(SCSIGenericState *s, uint32_t tag)
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{
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return DO_UPCAST(SCSIGenericReq, req, scsi_req_find(&s->qdev, tag));
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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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uint32_t tag;
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int status;
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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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status = BUSY << 1;
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else {
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if (s->driver_status & SG_ERR_DRIVER_TIMEOUT) {
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status = BUSY << 1;
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BADF("Driver Timeout\n");
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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 (s->driver_status & SG_ERR_DRIVER_SENSE)
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status = CHECK_CONDITION << 1;
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else
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status = GOOD << 1;
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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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tag = r->req.tag;
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r->req.bus->complete(r->req.bus, SCSI_REASON_DONE, tag, status);
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scsi_remove_request(r);
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}
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/* Cancel a pending data transfer. */
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static void scsi_cancel_io(SCSIDevice *d, uint32_t tag)
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{
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DPRINTF("scsi_cancel_io 0x%x\n", tag);
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d);
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SCSIGenericReq *r;
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DPRINTF("Cancel tag=0x%x\n", tag);
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r = scsi_find_request(s, tag);
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if (r) {
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if (r->req.aiocb)
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bdrv_aio_cancel(r->req.aiocb);
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r->req.aiocb = NULL;
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scsi_remove_request(r);
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}
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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 -1;
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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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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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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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r->req.bus->complete(r->req.bus, SCSI_REASON_DATA, r->req.tag, len);
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if (len == 0)
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scsi_command_complete(r, 0);
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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(SCSIDevice *d, uint32_t tag)
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d);
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SCSIGenericReq *r;
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int ret;
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DPRINTF("scsi_read_data 0x%x\n", tag);
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r = scsi_find_request(s, tag);
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if (!r) {
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BADF("Bad read tag 0x%x\n", tag);
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/* ??? This is the wrong error. */
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scsi_command_complete(r, -EINVAL);
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return;
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}
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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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r->req.bus->complete(r->req.bus, SCSI_REASON_DATA, r->req.tag, s->senselen);
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return;
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}
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ret = execute_command(s->dinfo->bdrv, r, SG_DXFER_FROM_DEV, scsi_read_complete);
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if (ret == -1) {
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scsi_command_complete(r, -EINVAL);
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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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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->qdev.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 int scsi_write_data(SCSIDevice *d, uint32_t tag)
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d);
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SCSIGenericReq *r;
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int ret;
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DPRINTF("scsi_write_data 0x%x\n", tag);
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r = scsi_find_request(s, tag);
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if (!r) {
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BADF("Bad write tag 0x%x\n", tag);
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/* ??? This is the wrong error. */
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scsi_command_complete(r, -EINVAL);
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return 0;
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}
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if (r->len == 0) {
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r->len = r->buflen;
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r->req.bus->complete(r->req.bus, SCSI_REASON_DATA, r->req.tag, r->len);
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return 0;
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}
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ret = execute_command(s->dinfo->bdrv, r, SG_DXFER_TO_DEV, scsi_write_complete);
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if (ret == -1) {
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scsi_command_complete(r, -EINVAL);
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return 1;
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}
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return 0;
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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(SCSIDevice *d, uint32_t tag)
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d);
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SCSIGenericReq *r;
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r = scsi_find_request(s, tag);
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if (!r) {
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BADF("Bad buffer tag 0x%x\n", tag);
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return NULL;
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}
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return r->buf;
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}
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static int scsi_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len)
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{
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switch (cmd[0] >> 5) {
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case 0:
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*len = cmd[4];
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*cmdlen = 6;
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/* length 0 means 256 blocks */
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if (*len == 0)
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*len = 256;
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break;
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case 1:
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case 2:
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*len = cmd[8] | (cmd[7] << 8);
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*cmdlen = 10;
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break;
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case 4:
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*len = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24);
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*cmdlen = 16;
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break;
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case 5:
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*len = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24);
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*cmdlen = 12;
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break;
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default:
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return -1;
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}
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switch(cmd[0]) {
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case TEST_UNIT_READY:
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case REZERO_UNIT:
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case START_STOP:
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case SEEK_6:
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case WRITE_FILEMARKS:
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case SPACE:
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case ERASE:
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case ALLOW_MEDIUM_REMOVAL:
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case VERIFY:
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case SEEK_10:
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case SYNCHRONIZE_CACHE:
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case LOCK_UNLOCK_CACHE:
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case LOAD_UNLOAD:
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case SET_CD_SPEED:
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case SET_LIMITS:
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case WRITE_LONG:
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case MOVE_MEDIUM:
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case UPDATE_BLOCK:
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*len = 0;
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break;
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case MODE_SENSE:
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break;
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case WRITE_SAME:
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*len = 1;
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break;
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case READ_CAPACITY:
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*len = 8;
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break;
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case READ_BLOCK_LIMITS:
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*len = 6;
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break;
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case READ_POSITION:
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*len = 20;
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break;
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case SEND_VOLUME_TAG:
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*len *= 40;
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break;
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case MEDIUM_SCAN:
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*len *= 8;
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break;
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case WRITE_10:
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cmd[1] &= ~0x08; /* disable FUA */
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case WRITE_VERIFY:
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case WRITE_6:
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case WRITE_12:
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case WRITE_VERIFY_12:
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*len *= blocksize;
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break;
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case READ_10:
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cmd[1] &= ~0x08; /* disable FUA */
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case READ_6:
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case READ_REVERSE:
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case RECOVER_BUFFERED_DATA:
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case READ_12:
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*len *= blocksize;
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break;
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case INQUIRY:
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*len = cmd[4] | (cmd[3] << 8);
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break;
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}
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return 0;
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}
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static int scsi_stream_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len)
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{
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switch(cmd[0]) {
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/* stream commands */
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case READ_6:
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case READ_REVERSE:
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case RECOVER_BUFFERED_DATA:
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case WRITE_6:
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*cmdlen = 6;
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*len = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16);
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if (cmd[1] & 0x01) /* fixed */
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*len *= blocksize;
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break;
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case REWIND:
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case START_STOP:
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*cmdlen = 6;
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*len = 0;
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cmd[1] = 0x01; /* force IMMED, otherwise qemu waits end of command */
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break;
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/* generic commands */
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default:
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return scsi_length(cmd, blocksize, cmdlen, len);
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}
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return 0;
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}
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static int is_write(int command)
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{
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switch (command) {
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case COPY:
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case COPY_VERIFY:
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case COMPARE:
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case CHANGE_DEFINITION:
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case LOG_SELECT:
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case MODE_SELECT:
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case MODE_SELECT_10:
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case SEND_DIAGNOSTIC:
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case WRITE_BUFFER:
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case FORMAT_UNIT:
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case REASSIGN_BLOCKS:
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case RESERVE:
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case SEARCH_EQUAL:
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case SEARCH_HIGH:
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case SEARCH_LOW:
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case WRITE_6:
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case WRITE_10:
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case WRITE_VERIFY:
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case UPDATE_BLOCK:
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case WRITE_LONG:
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case WRITE_SAME:
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case SEARCH_HIGH_12:
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case SEARCH_EQUAL_12:
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case SEARCH_LOW_12:
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case WRITE_12:
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case WRITE_VERIFY_12:
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case SET_WINDOW:
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case MEDIUM_SCAN:
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case SEND_VOLUME_TAG:
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case WRITE_LONG_2:
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return 1;
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}
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return 0;
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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(SCSIDevice *d, uint32_t tag,
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uint8_t *cmd, int lun)
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{
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SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d);
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uint32_t len=0;
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int cmdlen=0;
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SCSIGenericReq *r;
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SCSIBus *bus;
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int ret;
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if (s->type == TYPE_TAPE) {
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if (scsi_stream_length(cmd, s->qdev.blocksize, &cmdlen, &len) == -1) {
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BADF("Unsupported command length, command %x\n", cmd[0]);
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return 0;
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}
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} else {
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if (scsi_length(cmd, s->qdev.blocksize, &cmdlen, &len) == -1) {
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BADF("Unsupported command length, command %x\n", cmd[0]);
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return 0;
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}
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}
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DPRINTF("Command: lun=%d tag=0x%x data=0x%02x len %d\n", lun, tag,
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cmd[0], len);
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if (cmd[0] != REQUEST_SENSE &&
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(lun != s->lun || (cmd[1] >> 5) != s->lun)) {
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DPRINTF("Unimplemented LUN %d\n", lun ? lun : cmd[1] >> 5);
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s->sensebuf[0] = 0x70;
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s->sensebuf[1] = 0x00;
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s->sensebuf[2] = ILLEGAL_REQUEST;
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s->sensebuf[3] = 0x00;
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s->sensebuf[4] = 0x00;
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s->sensebuf[5] = 0x00;
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s->sensebuf[6] = 0x00;
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s->senselen = 7;
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s->driver_status = SG_ERR_DRIVER_SENSE;
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bus = scsi_bus_from_device(d);
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bus->complete(bus, SCSI_REASON_DONE, tag, CHECK_CONDITION << 1);
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return 0;
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}
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r = scsi_find_request(s, tag);
|
|
if (r) {
|
|
BADF("Tag 0x%x already in use %p\n", tag, r);
|
|
scsi_cancel_io(d, tag);
|
|
}
|
|
r = scsi_new_request(d, tag, lun);
|
|
|
|
memcpy(r->req.cmd.buf, cmd, cmdlen);
|
|
r->req.cmd.len = cmdlen;
|
|
|
|
if (len == 0) {
|
|
if (r->buf != NULL)
|
|
qemu_free(r->buf);
|
|
r->buflen = 0;
|
|
r->buf = NULL;
|
|
ret = execute_command(s->dinfo->bdrv, r, SG_DXFER_NONE, scsi_command_complete);
|
|
if (ret == -1) {
|
|
scsi_command_complete(r, -EINVAL);
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (r->buflen != len) {
|
|
if (r->buf != NULL)
|
|
qemu_free(r->buf);
|
|
r->buf = qemu_malloc(len);
|
|
r->buflen = len;
|
|
}
|
|
|
|
memset(r->buf, 0, r->buflen);
|
|
r->len = len;
|
|
if (is_write(cmd[0])) {
|
|
r->len = 0;
|
|
return -len;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int get_blocksize(BlockDriverState *bdrv)
|
|
{
|
|
uint8_t cmd[10];
|
|
uint8_t buf[8];
|
|
uint8_t sensebuf[8];
|
|
sg_io_hdr_t io_header;
|
|
int ret;
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
memset(buf, 0, sizeof(buf));
|
|
cmd[0] = READ_CAPACITY;
|
|
|
|
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 */
|
|
|
|
ret = bdrv_ioctl(bdrv, SG_IO, &io_header);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
return (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
|
|
}
|
|
|
|
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 */
|
|
|
|
ret = bdrv_ioctl(bdrv, SG_IO, &io_header);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
return (buf[9] << 16) | (buf[10] << 8) | buf[11];
|
|
}
|
|
|
|
static void scsi_destroy(SCSIDevice *d)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, d);
|
|
SCSIGenericReq *r;
|
|
|
|
while (!QTAILQ_EMPTY(&s->qdev.requests)) {
|
|
r = DO_UPCAST(SCSIGenericReq, req, QTAILQ_FIRST(&s->qdev.requests));
|
|
scsi_remove_request(r);
|
|
}
|
|
drive_uninit(s->dinfo);
|
|
}
|
|
|
|
static int scsi_generic_initfn(SCSIDevice *dev)
|
|
{
|
|
SCSIGenericState *s = DO_UPCAST(SCSIGenericState, qdev, dev);
|
|
int sg_version;
|
|
struct sg_scsi_id scsiid;
|
|
|
|
if (!s->dinfo || !s->dinfo->bdrv) {
|
|
qemu_error("scsi-generic: drive property not set\n");
|
|
return -1;
|
|
}
|
|
|
|
/* check we are really using a /dev/sg* file */
|
|
if (!bdrv_is_sg(s->dinfo->bdrv)) {
|
|
qemu_error("scsi-generic: not /dev/sg*\n");
|
|
return -1;
|
|
}
|
|
|
|
/* check we are using a driver managing SG_IO (version 3 and after */
|
|
if (bdrv_ioctl(s->dinfo->bdrv, SG_GET_VERSION_NUM, &sg_version) < 0 ||
|
|
sg_version < 30000) {
|
|
qemu_error("scsi-generic: scsi generic interface too old\n");
|
|
return -1;
|
|
}
|
|
|
|
/* get LUN of the /dev/sg? */
|
|
if (bdrv_ioctl(s->dinfo->bdrv, SG_GET_SCSI_ID, &scsiid)) {
|
|
qemu_error("scsi-generic: SG_GET_SCSI_ID ioctl failed\n");
|
|
return -1;
|
|
}
|
|
|
|
/* define device state */
|
|
s->lun = scsiid.lun;
|
|
DPRINTF("LUN %d\n", s->lun);
|
|
s->type = scsiid.scsi_type;
|
|
DPRINTF("device type %d\n", s->type);
|
|
if (s->type == TYPE_TAPE) {
|
|
s->qdev.blocksize = get_stream_blocksize(s->dinfo->bdrv);
|
|
if (s->qdev.blocksize == -1)
|
|
s->qdev.blocksize = 0;
|
|
} else {
|
|
s->qdev.blocksize = get_blocksize(s->dinfo->bdrv);
|
|
/* removable media returns 0 if not present */
|
|
if (s->qdev.blocksize <= 0) {
|
|
if (s->type == TYPE_ROM || s->type == TYPE_WORM)
|
|
s->qdev.blocksize = 2048;
|
|
else
|
|
s->qdev.blocksize = 512;
|
|
}
|
|
}
|
|
DPRINTF("block size %d\n", s->qdev.blocksize);
|
|
s->driver_status = 0;
|
|
memset(s->sensebuf, 0, sizeof(s->sensebuf));
|
|
return 0;
|
|
}
|
|
|
|
static SCSIDeviceInfo scsi_generic_info = {
|
|
.qdev.name = "scsi-generic",
|
|
.qdev.desc = "pass through generic scsi device (/dev/sg*)",
|
|
.qdev.size = sizeof(SCSIGenericState),
|
|
.init = scsi_generic_initfn,
|
|
.destroy = scsi_destroy,
|
|
.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,
|
|
.qdev.props = (Property[]) {
|
|
DEFINE_PROP_DRIVE("drive", SCSIGenericState, dinfo),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
},
|
|
};
|
|
|
|
static void scsi_generic_register_devices(void)
|
|
{
|
|
scsi_qdev_register(&scsi_generic_info);
|
|
}
|
|
device_init(scsi_generic_register_devices)
|
|
|
|
#endif /* __linux__ */
|