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/*
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* Generic SCSI Device support
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*
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* Copyright (c) 2007 Bull S.A.S.
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* Based on code by Paul Brook
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* Based on code by Fabrice Bellard
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*
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* Written by Laurent Vivier <Laurent.Vivier@bull.net>
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*
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* This code is licenced under the LGPL.
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*
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*/
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#include "qemu-common.h" |
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#include "block.h" |
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#include "scsi-disk.h" |
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|
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#ifndef __linux__
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|
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SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,
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scsi_completionfn completion, void *opaque)
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{ |
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return NULL; |
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} |
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#else /* __linux__ */ |
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//#define DEBUG_SCSI
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#ifdef DEBUG_SCSI
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#define DPRINTF(fmt, args...) \
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do { printf("scsi-generic: " fmt , ##args); } while (0) |
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#else
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#define DPRINTF(fmt, args...) do {} while(0) |
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#endif
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#define BADF(fmt, args...) \
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do { fprintf(stderr, "scsi-generic: " fmt , ##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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|
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#define SCSI_CMD_BUF_SIZE 16 |
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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 SCSIRequest { |
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BlockDriverAIOCB *aiocb; |
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struct SCSIRequest *next;
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SCSIDeviceState *dev; |
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uint32_t tag; |
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uint8_t cmd[SCSI_CMD_BUF_SIZE]; |
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int cmdlen;
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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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} SCSIRequest; |
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struct SCSIDeviceState
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{ |
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SCSIRequest *requests; |
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BlockDriverState *bdrv; |
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int type;
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int blocksize;
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int lun;
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scsi_completionfn completion; |
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void *opaque;
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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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/* Global pool of SCSIRequest structures. */
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static SCSIRequest *free_requests = NULL; |
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static SCSIRequest *scsi_new_request(SCSIDeviceState *s, uint32_t tag)
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{ |
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SCSIRequest *r; |
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if (free_requests) {
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r = free_requests; |
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free_requests = r->next; |
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} else {
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r = qemu_malloc(sizeof(SCSIRequest));
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r->buf = NULL;
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r->buflen = 0;
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} |
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r->dev = s; |
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r->tag = tag; |
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memset(r->cmd, 0, sizeof(r->cmd)); |
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memset(&r->io_header, 0, sizeof(r->io_header)); |
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r->cmdlen = 0;
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r->len = 0;
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r->aiocb = NULL;
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/* link */
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r->next = s->requests; |
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s->requests = r; |
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return r;
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} |
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static void scsi_remove_request(SCSIRequest *r) |
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{ |
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SCSIRequest *last; |
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SCSIDeviceState *s = r->dev; |
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if (s->requests == r) {
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s->requests = r->next; |
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} else {
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last = s->requests; |
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while (last && last->next != r)
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last = last->next; |
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if (last) {
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last->next = r->next; |
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} else {
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BADF("Orphaned request\n");
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} |
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} |
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r->next = free_requests; |
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free_requests = r; |
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} |
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static SCSIRequest *scsi_find_request(SCSIDeviceState *s, uint32_t tag)
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{ |
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SCSIRequest *r; |
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r = s->requests; |
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while (r && r->tag != tag)
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r = r->next; |
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return r;
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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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SCSIRequest *r = (SCSIRequest *)opaque; |
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SCSIDeviceState *s = r->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->tag, status); |
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tag = r->tag; |
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scsi_remove_request(r); |
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s->completion(s->opaque, SCSI_REASON_DONE, tag, status); |
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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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SCSIDeviceState *s = d->state; |
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SCSIRequest *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->aiocb)
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bdrv_aio_cancel(r->aiocb); |
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r->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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SCSIRequest *r, int direction,
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BlockDriverCompletionFunc *complete) |
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{ |
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int ret;
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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->cmd; |
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r->io_header.cmd_len = r->cmdlen; |
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r->io_header.mx_sb_len = sizeof(r->dev->sensebuf);
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r->io_header.sbp = r->dev->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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ret = bdrv_sg_send_command(bdrv, &r->io_header, sizeof(r->io_header));
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if (ret < 0) { |
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BADF("execute_command: write failed ! (%d)\n", errno);
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return -1; |
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} |
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if (complete == NULL) { |
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int ret;
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r->aiocb = NULL;
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while ((ret = bdrv_sg_recv_response(bdrv, &r->io_header,
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sizeof(r->io_header))) < 0 && |
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ret == -EINTR) |
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; |
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if (ret < 0) { |
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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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r->aiocb = bdrv_sg_aio_read(bdrv, (uint8_t*)&r->io_header, |
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sizeof(r->io_header), complete, r);
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if (r->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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SCSIRequest *r = (SCSIRequest *)opaque; |
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SCSIDeviceState *s = r->dev; |
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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->tag, len);
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r->len = -1;
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s->completion(s->opaque, SCSI_REASON_DATA, r->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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SCSIDeviceState *s = d->state; |
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SCSIRequest *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->cmd[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->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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s->completion(s->opaque, SCSI_REASON_DATA, r->tag, s->senselen); |
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return;
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} |
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ret = execute_command(s->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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SCSIRequest *r = (SCSIRequest *)opaque; |
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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->cmd[0] == MODE_SELECT && r->cmd[4] == 12 && |
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r->dev->type == TYPE_TAPE) { |
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r->dev->blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11]; |
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DPRINTF("block size %d\n", r->dev->blocksize);
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} |
327 |
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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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SCSIDeviceState *s = d->state; |
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SCSIRequest *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); |
341 |
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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} |
347 |
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if (r->len == 0) { |
349 |
r->len = r->buflen; |
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s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->len); |
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return 0; |
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} |
353 |
|
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ret = execute_command(s->bdrv, r, SG_DXFER_TO_DEV, scsi_write_complete); |
355 |
if (ret == -1) { |
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scsi_command_complete(r, -EINVAL); |
357 |
return 1; |
358 |
} |
359 |
|
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return 0; |
361 |
} |
362 |
|
363 |
/* 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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SCSIDeviceState *s = d->state; |
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SCSIRequest *r; |
368 |
r = scsi_find_request(s, tag); |
369 |
if (!r) {
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370 |
BADF("Bad buffer tag 0x%x\n", tag);
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371 |
return NULL; |
372 |
} |
373 |
return r->buf;
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} |
375 |
|
376 |
static int scsi_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len) |
377 |
{ |
378 |
switch (cmd[0] >> 5) { |
379 |
case 0: |
380 |
*len = cmd[4];
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381 |
*cmdlen = 6;
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382 |
/* length 0 means 256 blocks */
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383 |
if (*len == 0) |
384 |
*len = 256;
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break;
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386 |
case 1: |
387 |
case 2: |
388 |
*len = cmd[8] | (cmd[7] << 8); |
389 |
*cmdlen = 10;
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break;
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391 |
case 4: |
392 |
*len = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24); |
393 |
*cmdlen = 16;
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394 |
break;
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395 |
case 5: |
396 |
*len = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24); |
397 |
*cmdlen = 12;
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398 |
break;
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399 |
default:
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400 |
return -1; |
401 |
} |
402 |
|
403 |
switch(cmd[0]) { |
404 |
case TEST_UNIT_READY:
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405 |
case REZERO_UNIT:
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406 |
case START_STOP:
|
407 |
case SEEK_6:
|
408 |
case WRITE_FILEMARKS:
|
409 |
case SPACE:
|
410 |
case ERASE:
|
411 |
case ALLOW_MEDIUM_REMOVAL:
|
412 |
case VERIFY:
|
413 |
case SEEK_10:
|
414 |
case SYNCHRONIZE_CACHE:
|
415 |
case LOCK_UNLOCK_CACHE:
|
416 |
case LOAD_UNLOAD:
|
417 |
case SET_CD_SPEED:
|
418 |
case SET_LIMITS:
|
419 |
case WRITE_LONG:
|
420 |
case MOVE_MEDIUM:
|
421 |
case UPDATE_BLOCK:
|
422 |
*len = 0;
|
423 |
break;
|
424 |
case MODE_SENSE:
|
425 |
break;
|
426 |
case WRITE_SAME:
|
427 |
*len = 1;
|
428 |
break;
|
429 |
case READ_CAPACITY:
|
430 |
*len = 8;
|
431 |
break;
|
432 |
case READ_BLOCK_LIMITS:
|
433 |
*len = 6;
|
434 |
break;
|
435 |
case READ_POSITION:
|
436 |
*len = 20;
|
437 |
break;
|
438 |
case SEND_VOLUME_TAG:
|
439 |
*len *= 40;
|
440 |
break;
|
441 |
case MEDIUM_SCAN:
|
442 |
*len *= 8;
|
443 |
break;
|
444 |
case WRITE_10:
|
445 |
cmd[1] &= ~0x08; /* disable FUA */ |
446 |
case WRITE_VERIFY:
|
447 |
case WRITE_6:
|
448 |
case WRITE_12:
|
449 |
case WRITE_VERIFY_12:
|
450 |
*len *= blocksize; |
451 |
break;
|
452 |
case READ_10:
|
453 |
cmd[1] &= ~0x08; /* disable FUA */ |
454 |
case READ_6:
|
455 |
case READ_REVERSE:
|
456 |
case RECOVER_BUFFERED_DATA:
|
457 |
case READ_12:
|
458 |
*len *= blocksize; |
459 |
break;
|
460 |
case INQUIRY:
|
461 |
*len = cmd[4] | (cmd[3] << 8); |
462 |
break;
|
463 |
} |
464 |
return 0; |
465 |
} |
466 |
|
467 |
static int scsi_stream_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len) |
468 |
{ |
469 |
switch(cmd[0]) { |
470 |
/* stream commands */
|
471 |
case READ_6:
|
472 |
case READ_REVERSE:
|
473 |
case RECOVER_BUFFERED_DATA:
|
474 |
case WRITE_6:
|
475 |
*cmdlen = 6;
|
476 |
*len = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16); |
477 |
if (cmd[1] & 0x01) /* fixed */ |
478 |
*len *= blocksize; |
479 |
break;
|
480 |
case REWIND:
|
481 |
case START_STOP:
|
482 |
*cmdlen = 6;
|
483 |
*len = 0;
|
484 |
cmd[1] = 0x01; /* force IMMED, otherwise qemu waits end of command */ |
485 |
break;
|
486 |
/* generic commands */
|
487 |
default:
|
488 |
return scsi_length(cmd, blocksize, cmdlen, len);
|
489 |
} |
490 |
return 0; |
491 |
} |
492 |
|
493 |
static int is_write(int command) |
494 |
{ |
495 |
switch (command) {
|
496 |
case COPY:
|
497 |
case COPY_VERIFY:
|
498 |
case COMPARE:
|
499 |
case CHANGE_DEFINITION:
|
500 |
case LOG_SELECT:
|
501 |
case MODE_SELECT:
|
502 |
case MODE_SELECT_10:
|
503 |
case SEND_DIAGNOSTIC:
|
504 |
case WRITE_BUFFER:
|
505 |
case FORMAT_UNIT:
|
506 |
case REASSIGN_BLOCKS:
|
507 |
case RESERVE:
|
508 |
case SEARCH_EQUAL:
|
509 |
case SEARCH_HIGH:
|
510 |
case SEARCH_LOW:
|
511 |
case WRITE_6:
|
512 |
case WRITE_10:
|
513 |
case WRITE_VERIFY:
|
514 |
case UPDATE_BLOCK:
|
515 |
case WRITE_LONG:
|
516 |
case WRITE_SAME:
|
517 |
case SEARCH_HIGH_12:
|
518 |
case SEARCH_EQUAL_12:
|
519 |
case SEARCH_LOW_12:
|
520 |
case WRITE_12:
|
521 |
case WRITE_VERIFY_12:
|
522 |
case SET_WINDOW:
|
523 |
case MEDIUM_SCAN:
|
524 |
case SEND_VOLUME_TAG:
|
525 |
case WRITE_LONG_2:
|
526 |
return 1; |
527 |
} |
528 |
return 0; |
529 |
} |
530 |
|
531 |
/* Execute a scsi command. Returns the length of the data expected by the
|
532 |
command. This will be Positive for data transfers from the device
|
533 |
(eg. disk reads), negative for transfers to the device (eg. disk writes),
|
534 |
and zero if the command does not transfer any data. */
|
535 |
|
536 |
static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
|
537 |
uint8_t *cmd, int lun)
|
538 |
{ |
539 |
SCSIDeviceState *s = d->state; |
540 |
uint32_t len=0;
|
541 |
int cmdlen=0; |
542 |
SCSIRequest *r; |
543 |
int ret;
|
544 |
|
545 |
if (s->type == TYPE_TAPE) {
|
546 |
if (scsi_stream_length(cmd, s->blocksize, &cmdlen, &len) == -1) { |
547 |
BADF("Unsupported command length, command %x\n", cmd[0]); |
548 |
return 0; |
549 |
} |
550 |
} else {
|
551 |
if (scsi_length(cmd, s->blocksize, &cmdlen, &len) == -1) { |
552 |
BADF("Unsupported command length, command %x\n", cmd[0]); |
553 |
return 0; |
554 |
} |
555 |
} |
556 |
|
557 |
DPRINTF("Command: lun=%d tag=0x%x data=0x%02x len %d\n", lun, tag,
|
558 |
cmd[0], len);
|
559 |
|
560 |
if (cmd[0] != REQUEST_SENSE && |
561 |
(lun != s->lun || (cmd[1] >> 5) != s->lun)) { |
562 |
DPRINTF("Unimplemented LUN %d\n", lun ? lun : cmd[1] >> 5); |
563 |
|
564 |
s->sensebuf[0] = 0x70; |
565 |
s->sensebuf[1] = 0x00; |
566 |
s->sensebuf[2] = ILLEGAL_REQUEST;
|
567 |
s->sensebuf[3] = 0x00; |
568 |
s->sensebuf[4] = 0x00; |
569 |
s->sensebuf[5] = 0x00; |
570 |
s->sensebuf[6] = 0x00; |
571 |
s->senselen = 7;
|
572 |
s->driver_status = SG_ERR_DRIVER_SENSE; |
573 |
s->completion(s->opaque, SCSI_REASON_DONE, tag, CHECK_CONDITION << 1);
|
574 |
return 0; |
575 |
} |
576 |
|
577 |
r = scsi_find_request(s, tag); |
578 |
if (r) {
|
579 |
BADF("Tag 0x%x already in use %p\n", tag, r);
|
580 |
scsi_cancel_io(d, tag); |
581 |
} |
582 |
r = scsi_new_request(s, tag); |
583 |
|
584 |
memcpy(r->cmd, cmd, cmdlen); |
585 |
r->cmdlen = cmdlen; |
586 |
|
587 |
if (len == 0) { |
588 |
if (r->buf != NULL) |
589 |
free(r->buf); |
590 |
r->buflen = 0;
|
591 |
r->buf = NULL;
|
592 |
ret = execute_command(s->bdrv, r, SG_DXFER_NONE, scsi_command_complete); |
593 |
if (ret == -1) { |
594 |
scsi_command_complete(r, -EINVAL); |
595 |
return 0; |
596 |
} |
597 |
return 0; |
598 |
} |
599 |
|
600 |
if (r->buflen != len) {
|
601 |
if (r->buf != NULL) |
602 |
free(r->buf); |
603 |
r->buf = qemu_malloc(len); |
604 |
r->buflen = len; |
605 |
} |
606 |
|
607 |
memset(r->buf, 0, r->buflen);
|
608 |
r->len = len; |
609 |
if (is_write(cmd[0])) { |
610 |
r->len = 0;
|
611 |
return -len;
|
612 |
} |
613 |
|
614 |
return len;
|
615 |
} |
616 |
|
617 |
static int get_blocksize(BlockDriverState *bdrv) |
618 |
{ |
619 |
uint8_t cmd[10];
|
620 |
uint8_t buf[8];
|
621 |
uint8_t sensebuf[8];
|
622 |
sg_io_hdr_t io_header; |
623 |
int ret;
|
624 |
|
625 |
memset(cmd, 0, sizeof(cmd)); |
626 |
memset(buf, 0, sizeof(buf)); |
627 |
cmd[0] = READ_CAPACITY;
|
628 |
|
629 |
memset(&io_header, 0, sizeof(io_header)); |
630 |
io_header.interface_id = 'S';
|
631 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
632 |
io_header.dxfer_len = sizeof(buf);
|
633 |
io_header.dxferp = buf; |
634 |
io_header.cmdp = cmd; |
635 |
io_header.cmd_len = sizeof(cmd);
|
636 |
io_header.mx_sb_len = sizeof(sensebuf);
|
637 |
io_header.sbp = sensebuf; |
638 |
io_header.timeout = 6000; /* XXX */ |
639 |
|
640 |
ret = bdrv_sg_send_command(bdrv, &io_header, sizeof(io_header));
|
641 |
if (ret < 0) |
642 |
return -1; |
643 |
|
644 |
while ((ret = bdrv_sg_recv_response(bdrv, &io_header, sizeof(io_header))) < 0 && |
645 |
ret == -EINTR) |
646 |
; |
647 |
|
648 |
if (ret < 0) |
649 |
return -1; |
650 |
|
651 |
return (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; |
652 |
} |
653 |
|
654 |
static int get_stream_blocksize(BlockDriverState *bdrv) |
655 |
{ |
656 |
uint8_t cmd[6];
|
657 |
uint8_t buf[12];
|
658 |
uint8_t sensebuf[8];
|
659 |
sg_io_hdr_t io_header; |
660 |
int ret;
|
661 |
|
662 |
memset(cmd, 0, sizeof(cmd)); |
663 |
memset(buf, 0, sizeof(buf)); |
664 |
cmd[0] = MODE_SENSE;
|
665 |
cmd[4] = sizeof(buf); |
666 |
|
667 |
memset(&io_header, 0, sizeof(io_header)); |
668 |
io_header.interface_id = 'S';
|
669 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
670 |
io_header.dxfer_len = sizeof(buf);
|
671 |
io_header.dxferp = buf; |
672 |
io_header.cmdp = cmd; |
673 |
io_header.cmd_len = sizeof(cmd);
|
674 |
io_header.mx_sb_len = sizeof(sensebuf);
|
675 |
io_header.sbp = sensebuf; |
676 |
io_header.timeout = 6000; /* XXX */ |
677 |
|
678 |
ret = bdrv_sg_send_command(bdrv, &io_header, sizeof(io_header));
|
679 |
if (ret < 0) |
680 |
return -1; |
681 |
|
682 |
while ((ret = bdrv_sg_recv_response(bdrv, &io_header, sizeof(io_header))) < 0 && |
683 |
ret == -EINTR) |
684 |
; |
685 |
|
686 |
if (ret < 0) |
687 |
return -1; |
688 |
|
689 |
return (buf[9] << 16) | (buf[10] << 8) | buf[11]; |
690 |
} |
691 |
|
692 |
static void scsi_destroy(SCSIDevice *d) |
693 |
{ |
694 |
SCSIRequest *r, *n; |
695 |
|
696 |
r = d->state->requests; |
697 |
while (r) {
|
698 |
n = r->next; |
699 |
qemu_free(r); |
700 |
r = n; |
701 |
} |
702 |
|
703 |
r = free_requests; |
704 |
while (r) {
|
705 |
n = r->next; |
706 |
qemu_free(r); |
707 |
r = n; |
708 |
} |
709 |
|
710 |
qemu_free(d->state); |
711 |
qemu_free(d); |
712 |
} |
713 |
|
714 |
SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,
|
715 |
scsi_completionfn completion, void *opaque)
|
716 |
{ |
717 |
int sg_version;
|
718 |
SCSIDevice *d; |
719 |
SCSIDeviceState *s; |
720 |
struct sg_scsi_id scsiid;
|
721 |
|
722 |
/* check we are really using a /dev/sg* file */
|
723 |
|
724 |
if (!bdrv_is_sg(bdrv))
|
725 |
return NULL; |
726 |
|
727 |
/* check we are using a driver managing SG_IO (version 3 and after */
|
728 |
|
729 |
if (bdrv_ioctl(bdrv, SG_GET_VERSION_NUM, &sg_version) < 0 || |
730 |
sg_version < 30000)
|
731 |
return NULL; |
732 |
|
733 |
/* get LUN of the /dev/sg? */
|
734 |
|
735 |
if (bdrv_ioctl(bdrv, SG_GET_SCSI_ID, &scsiid))
|
736 |
return NULL; |
737 |
|
738 |
/* define device state */
|
739 |
|
740 |
s = (SCSIDeviceState *)qemu_mallocz(sizeof(SCSIDeviceState));
|
741 |
s->bdrv = bdrv; |
742 |
s->requests = NULL;
|
743 |
s->completion = completion; |
744 |
s->opaque = opaque; |
745 |
s->lun = scsiid.lun; |
746 |
DPRINTF("LUN %d\n", s->lun);
|
747 |
s->type = scsiid.scsi_type; |
748 |
DPRINTF("device type %d\n", s->type);
|
749 |
if (s->type == TYPE_TAPE) {
|
750 |
s->blocksize = get_stream_blocksize(s->bdrv); |
751 |
if (s->blocksize == -1) |
752 |
s->blocksize = 0;
|
753 |
} else {
|
754 |
s->blocksize = get_blocksize(s->bdrv); |
755 |
/* removable media returns 0 if not present */
|
756 |
if (s->blocksize <= 0) { |
757 |
if (s->type == TYPE_ROM || s->type == TYPE_WORM)
|
758 |
s->blocksize = 2048;
|
759 |
else
|
760 |
s->blocksize = 512;
|
761 |
} |
762 |
} |
763 |
DPRINTF("block size %d\n", s->blocksize);
|
764 |
s->driver_status = 0;
|
765 |
memset(s->sensebuf, 0, sizeof(s->sensebuf)); |
766 |
|
767 |
/* define function to manage device */
|
768 |
|
769 |
d = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
770 |
d->state = s; |
771 |
d->destroy = scsi_destroy; |
772 |
d->send_command = scsi_send_command; |
773 |
d->read_data = scsi_read_data; |
774 |
d->write_data = scsi_write_data; |
775 |
d->cancel_io = scsi_cancel_io; |
776 |
d->get_buf = scsi_get_buf; |
777 |
|
778 |
return d;
|
779 |
} |
780 |
#endif /* __linux__ */ |