root / hw / scsi-generic.c @ 9b32d5a5
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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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|
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#else /* __linux__ */ |
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|
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//#define DEBUG_SCSI
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|
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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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|
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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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|
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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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|
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#define SG_ERR_DRIVER_TIMEOUT 0x06 |
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#define SG_ERR_DRIVER_SENSE 0x08 |
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|
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#ifndef MAX_UINT
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#define MAX_UINT ((unsigned int)-1) |
| 61 |
#endif
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|
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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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|
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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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|
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/* Global pool of SCSIRequest structures. */
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static SCSIRequest *free_requests = NULL; |
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|
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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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|
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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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|
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/* link */
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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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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|
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if (bdrv_pwrite(bdrv, -1, &r->io_header, sizeof(r->io_header)) == -1) { |
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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_pread(bdrv, -1, &r->io_header, |
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sizeof(r->io_header))) == -1 && |
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errno == EINTR); |
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if (ret == -1) { |
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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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|
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r->aiocb = bdrv_aio_read(bdrv, 0, (uint8_t*)&r->io_header,
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-(int64_t)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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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} |
| 300 |
|
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ret = execute_command(s->bdrv, r, SG_DXFER_FROM_DEV, scsi_read_complete); |
| 302 |
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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} |
| 307 |
|
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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; |
| 311 |
|
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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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} |
| 318 |
|
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if (r->cmd[0] == MODE_SELECT && r->cmd[4] == 12 && |
| 320 |
r->dev->type == TYPE_TAPE) {
|
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r->dev->blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11]; |
| 322 |
DPRINTF("block size %d\n", r->dev->blocksize);
|
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} |
| 324 |
|
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scsi_command_complete(r, ret); |
| 326 |
} |
| 327 |
|
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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) |
| 331 |
{
|
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SCSIDeviceState *s = d->state; |
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SCSIRequest *r; |
| 334 |
int ret;
|
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|
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DPRINTF("scsi_write_data 0x%x\n", tag);
|
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r = scsi_find_request(s, tag); |
| 338 |
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; |
| 343 |
} |
| 344 |
|
| 345 |
if (r->len == 0) { |
| 346 |
r->len = r->buflen; |
| 347 |
s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->len); |
| 348 |
return 0; |
| 349 |
} |
| 350 |
|
| 351 |
ret = execute_command(s->bdrv, r, SG_DXFER_TO_DEV, scsi_write_complete); |
| 352 |
if (ret == -1) { |
| 353 |
scsi_command_complete(r, -EINVAL); |
| 354 |
return 1; |
| 355 |
} |
| 356 |
|
| 357 |
return 0; |
| 358 |
} |
| 359 |
|
| 360 |
/* Return a pointer to the data buffer. */
|
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static uint8_t *scsi_get_buf(SCSIDevice *d, uint32_t tag)
|
| 362 |
{
|
| 363 |
SCSIDeviceState *s = d->state; |
| 364 |
SCSIRequest *r; |
| 365 |
r = scsi_find_request(s, tag); |
| 366 |
if (!r) {
|
| 367 |
BADF("Bad buffer tag 0x%x\n", tag);
|
| 368 |
return NULL; |
| 369 |
} |
| 370 |
return r->buf;
|
| 371 |
} |
| 372 |
|
| 373 |
static int scsi_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len) |
| 374 |
{
|
| 375 |
switch (cmd[0] >> 5) { |
| 376 |
case 0: |
| 377 |
*len = cmd[4];
|
| 378 |
*cmdlen = 6;
|
| 379 |
/* length 0 means 256 blocks */
|
| 380 |
if (*len == 0) |
| 381 |
*len = 256;
|
| 382 |
break;
|
| 383 |
case 1: |
| 384 |
case 2: |
| 385 |
*len = cmd[8] | (cmd[7] << 8); |
| 386 |
*cmdlen = 10;
|
| 387 |
break;
|
| 388 |
case 4: |
| 389 |
*len = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24); |
| 390 |
*cmdlen = 16;
|
| 391 |
break;
|
| 392 |
case 5: |
| 393 |
*len = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24); |
| 394 |
*cmdlen = 12;
|
| 395 |
break;
|
| 396 |
default:
|
| 397 |
return -1; |
| 398 |
} |
| 399 |
|
| 400 |
switch(cmd[0]) { |
| 401 |
case TEST_UNIT_READY:
|
| 402 |
case REZERO_UNIT:
|
| 403 |
case START_STOP:
|
| 404 |
case SEEK_6:
|
| 405 |
case WRITE_FILEMARKS:
|
| 406 |
case SPACE:
|
| 407 |
case ERASE:
|
| 408 |
case ALLOW_MEDIUM_REMOVAL:
|
| 409 |
case VERIFY:
|
| 410 |
case SEEK_10:
|
| 411 |
case SYNCHRONIZE_CACHE:
|
| 412 |
case LOCK_UNLOCK_CACHE:
|
| 413 |
case LOAD_UNLOAD:
|
| 414 |
case SET_CD_SPEED:
|
| 415 |
case SET_LIMITS:
|
| 416 |
case WRITE_LONG:
|
| 417 |
case MOVE_MEDIUM:
|
| 418 |
case UPDATE_BLOCK:
|
| 419 |
*len = 0;
|
| 420 |
break;
|
| 421 |
case MODE_SENSE:
|
| 422 |
break;
|
| 423 |
case WRITE_SAME:
|
| 424 |
*len = 1;
|
| 425 |
break;
|
| 426 |
case READ_CAPACITY:
|
| 427 |
*len = 8;
|
| 428 |
break;
|
| 429 |
case READ_BLOCK_LIMITS:
|
| 430 |
*len = 6;
|
| 431 |
break;
|
| 432 |
case READ_POSITION:
|
| 433 |
*len = 20;
|
| 434 |
break;
|
| 435 |
case SEND_VOLUME_TAG:
|
| 436 |
*len *= 40;
|
| 437 |
break;
|
| 438 |
case MEDIUM_SCAN:
|
| 439 |
*len *= 8;
|
| 440 |
break;
|
| 441 |
case WRITE_10:
|
| 442 |
cmd[1] &= ~0x08; /* disable FUA */ |
| 443 |
case WRITE_VERIFY:
|
| 444 |
case WRITE_6:
|
| 445 |
case WRITE_12:
|
| 446 |
case WRITE_VERIFY_12:
|
| 447 |
*len *= blocksize; |
| 448 |
break;
|
| 449 |
case READ_10:
|
| 450 |
cmd[1] &= ~0x08; /* disable FUA */ |
| 451 |
case READ_6:
|
| 452 |
case READ_REVERSE:
|
| 453 |
case RECOVER_BUFFERED_DATA:
|
| 454 |
case READ_12:
|
| 455 |
*len *= blocksize; |
| 456 |
break;
|
| 457 |
case INQUIRY:
|
| 458 |
*len = cmd[4] | (cmd[3] << 8); |
| 459 |
break;
|
| 460 |
} |
| 461 |
return 0; |
| 462 |
} |
| 463 |
|
| 464 |
static int scsi_stream_length(uint8_t *cmd, int blocksize, int *cmdlen, uint32_t *len) |
| 465 |
{
|
| 466 |
switch(cmd[0]) { |
| 467 |
/* stream commands */
|
| 468 |
case READ_6:
|
| 469 |
case READ_REVERSE:
|
| 470 |
case RECOVER_BUFFERED_DATA:
|
| 471 |
case WRITE_6:
|
| 472 |
*cmdlen = 6;
|
| 473 |
*len = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16); |
| 474 |
if (cmd[1] & 0x01) /* fixed */ |
| 475 |
*len *= blocksize; |
| 476 |
break;
|
| 477 |
case REWIND:
|
| 478 |
case START_STOP:
|
| 479 |
*cmdlen = 6;
|
| 480 |
*len = 0;
|
| 481 |
cmd[1] = 0x01; /* force IMMED, otherwise qemu waits end of command */ |
| 482 |
break;
|
| 483 |
/* generic commands */
|
| 484 |
default:
|
| 485 |
return scsi_length(cmd, blocksize, cmdlen, len);
|
| 486 |
} |
| 487 |
return 0; |
| 488 |
} |
| 489 |
|
| 490 |
static int is_write(int command) |
| 491 |
{
|
| 492 |
switch (command) {
|
| 493 |
case COPY:
|
| 494 |
case COPY_VERIFY:
|
| 495 |
case COMPARE:
|
| 496 |
case CHANGE_DEFINITION:
|
| 497 |
case LOG_SELECT:
|
| 498 |
case MODE_SELECT:
|
| 499 |
case MODE_SELECT_10:
|
| 500 |
case SEND_DIAGNOSTIC:
|
| 501 |
case WRITE_BUFFER:
|
| 502 |
case FORMAT_UNIT:
|
| 503 |
case REASSIGN_BLOCKS:
|
| 504 |
case RESERVE:
|
| 505 |
case SEARCH_EQUAL:
|
| 506 |
case SEARCH_HIGH:
|
| 507 |
case SEARCH_LOW:
|
| 508 |
case WRITE_6:
|
| 509 |
case WRITE_10:
|
| 510 |
case WRITE_VERIFY:
|
| 511 |
case UPDATE_BLOCK:
|
| 512 |
case WRITE_LONG:
|
| 513 |
case WRITE_SAME:
|
| 514 |
case SEARCH_HIGH_12:
|
| 515 |
case SEARCH_EQUAL_12:
|
| 516 |
case SEARCH_LOW_12:
|
| 517 |
case WRITE_12:
|
| 518 |
case WRITE_VERIFY_12:
|
| 519 |
case SET_WINDOW:
|
| 520 |
case MEDIUM_SCAN:
|
| 521 |
case SEND_VOLUME_TAG:
|
| 522 |
case WRITE_LONG_2:
|
| 523 |
return 1; |
| 524 |
} |
| 525 |
return 0; |
| 526 |
} |
| 527 |
|
| 528 |
/* Execute a scsi command. Returns the length of the data expected by the
|
| 529 |
command. This will be Positive for data transfers from the device
|
| 530 |
(eg. disk reads), negative for transfers to the device (eg. disk writes),
|
| 531 |
and zero if the command does not transfer any data. */
|
| 532 |
|
| 533 |
static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
|
| 534 |
uint8_t *cmd, int lun)
|
| 535 |
{
|
| 536 |
SCSIDeviceState *s = d->state; |
| 537 |
uint32_t len=0;
|
| 538 |
int cmdlen=0; |
| 539 |
SCSIRequest *r; |
| 540 |
int ret;
|
| 541 |
|
| 542 |
if (s->type == TYPE_TAPE) {
|
| 543 |
if (scsi_stream_length(cmd, s->blocksize, &cmdlen, &len) == -1) { |
| 544 |
BADF("Unsupported command length, command %x\n", cmd[0]); |
| 545 |
return 0; |
| 546 |
} |
| 547 |
} else {
|
| 548 |
if (scsi_length(cmd, s->blocksize, &cmdlen, &len) == -1) { |
| 549 |
BADF("Unsupported command length, command %x\n", cmd[0]); |
| 550 |
return 0; |
| 551 |
} |
| 552 |
} |
| 553 |
|
| 554 |
DPRINTF("Command: lun=%d tag=0x%x data=0x%02x len %d\n", lun, tag,
|
| 555 |
cmd[0], len);
|
| 556 |
|
| 557 |
if (cmd[0] != REQUEST_SENSE && |
| 558 |
(lun != s->lun || (cmd[1] >> 5) != s->lun)) { |
| 559 |
DPRINTF("Unimplemented LUN %d\n", lun ? lun : cmd[1] >> 5); |
| 560 |
|
| 561 |
s->sensebuf[0] = 0x70; |
| 562 |
s->sensebuf[1] = 0x00; |
| 563 |
s->sensebuf[2] = ILLEGAL_REQUEST;
|
| 564 |
s->sensebuf[3] = 0x00; |
| 565 |
s->sensebuf[4] = 0x00; |
| 566 |
s->sensebuf[5] = 0x00; |
| 567 |
s->sensebuf[6] = 0x00; |
| 568 |
s->senselen = 7;
|
| 569 |
s->driver_status = SG_ERR_DRIVER_SENSE; |
| 570 |
s->completion(s->opaque, SCSI_REASON_DONE, tag, CHECK_CONDITION << 1);
|
| 571 |
return 0; |
| 572 |
} |
| 573 |
|
| 574 |
r = scsi_find_request(s, tag); |
| 575 |
if (r) {
|
| 576 |
BADF("Tag 0x%x already in use %p\n", tag, r);
|
| 577 |
scsi_cancel_io(d, tag); |
| 578 |
} |
| 579 |
r = scsi_new_request(s, tag); |
| 580 |
|
| 581 |
memcpy(r->cmd, cmd, cmdlen); |
| 582 |
r->cmdlen = cmdlen; |
| 583 |
|
| 584 |
if (len == 0) { |
| 585 |
if (r->buf != NULL) |
| 586 |
free(r->buf); |
| 587 |
r->buflen = 0;
|
| 588 |
r->buf = NULL;
|
| 589 |
ret = execute_command(s->bdrv, r, SG_DXFER_NONE, scsi_command_complete); |
| 590 |
if (ret == -1) { |
| 591 |
scsi_command_complete(r, -EINVAL); |
| 592 |
return 0; |
| 593 |
} |
| 594 |
return 0; |
| 595 |
} |
| 596 |
|
| 597 |
if (r->buflen != len) {
|
| 598 |
if (r->buf != NULL) |
| 599 |
free(r->buf); |
| 600 |
r->buf = qemu_malloc(len); |
| 601 |
r->buflen = len; |
| 602 |
} |
| 603 |
|
| 604 |
memset(r->buf, 0, r->buflen);
|
| 605 |
r->len = len; |
| 606 |
if (is_write(cmd[0])) { |
| 607 |
r->len = 0;
|
| 608 |
return -len;
|
| 609 |
} |
| 610 |
|
| 611 |
return len;
|
| 612 |
} |
| 613 |
|
| 614 |
static int get_blocksize(BlockDriverState *bdrv) |
| 615 |
{
|
| 616 |
uint8_t cmd[10];
|
| 617 |
uint8_t buf[8];
|
| 618 |
uint8_t sensebuf[8];
|
| 619 |
sg_io_hdr_t io_header; |
| 620 |
int ret;
|
| 621 |
|
| 622 |
memset(cmd, 0, sizeof(cmd)); |
| 623 |
memset(buf, 0, sizeof(buf)); |
| 624 |
cmd[0] = READ_CAPACITY;
|
| 625 |
|
| 626 |
memset(&io_header, 0, sizeof(io_header)); |
| 627 |
io_header.interface_id = 'S';
|
| 628 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
| 629 |
io_header.dxfer_len = sizeof(buf);
|
| 630 |
io_header.dxferp = buf; |
| 631 |
io_header.cmdp = cmd; |
| 632 |
io_header.cmd_len = sizeof(cmd);
|
| 633 |
io_header.mx_sb_len = sizeof(sensebuf);
|
| 634 |
io_header.sbp = sensebuf; |
| 635 |
io_header.timeout = 6000; /* XXX */ |
| 636 |
|
| 637 |
ret = bdrv_pwrite(bdrv, -1, &io_header, sizeof(io_header)); |
| 638 |
if (ret == -1) |
| 639 |
return -1; |
| 640 |
|
| 641 |
while ((ret = bdrv_pread(bdrv, -1, &io_header, sizeof(io_header))) == -1 && |
| 642 |
errno == EINTR); |
| 643 |
|
| 644 |
if (ret == -1) |
| 645 |
return -1; |
| 646 |
|
| 647 |
return (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; |
| 648 |
} |
| 649 |
|
| 650 |
static int get_stream_blocksize(BlockDriverState *bdrv) |
| 651 |
{
|
| 652 |
uint8_t cmd[6];
|
| 653 |
uint8_t buf[12];
|
| 654 |
uint8_t sensebuf[8];
|
| 655 |
sg_io_hdr_t io_header; |
| 656 |
int ret;
|
| 657 |
|
| 658 |
memset(cmd, 0, sizeof(cmd)); |
| 659 |
memset(buf, 0, sizeof(buf)); |
| 660 |
cmd[0] = MODE_SENSE;
|
| 661 |
cmd[4] = sizeof(buf); |
| 662 |
|
| 663 |
memset(&io_header, 0, sizeof(io_header)); |
| 664 |
io_header.interface_id = 'S';
|
| 665 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
| 666 |
io_header.dxfer_len = sizeof(buf);
|
| 667 |
io_header.dxferp = buf; |
| 668 |
io_header.cmdp = cmd; |
| 669 |
io_header.cmd_len = sizeof(cmd);
|
| 670 |
io_header.mx_sb_len = sizeof(sensebuf);
|
| 671 |
io_header.sbp = sensebuf; |
| 672 |
io_header.timeout = 6000; /* XXX */ |
| 673 |
|
| 674 |
ret = bdrv_pwrite(bdrv, -1, &io_header, sizeof(io_header)); |
| 675 |
if (ret == -1) |
| 676 |
return -1; |
| 677 |
|
| 678 |
while ((ret = bdrv_pread(bdrv, -1, &io_header, sizeof(io_header))) == -1 && |
| 679 |
errno == EINTR); |
| 680 |
|
| 681 |
if (ret == -1) |
| 682 |
return -1; |
| 683 |
|
| 684 |
return (buf[9] << 16) | (buf[10] << 8) | buf[11]; |
| 685 |
} |
| 686 |
|
| 687 |
static void scsi_destroy(SCSIDevice *d) |
| 688 |
{
|
| 689 |
SCSIRequest *r, *n; |
| 690 |
|
| 691 |
r = d->state->requests; |
| 692 |
while (r) {
|
| 693 |
n = r->next; |
| 694 |
qemu_free(r); |
| 695 |
r = n; |
| 696 |
} |
| 697 |
|
| 698 |
r = free_requests; |
| 699 |
while (r) {
|
| 700 |
n = r->next; |
| 701 |
qemu_free(r); |
| 702 |
r = n; |
| 703 |
} |
| 704 |
|
| 705 |
qemu_free(d->state); |
| 706 |
qemu_free(d); |
| 707 |
} |
| 708 |
|
| 709 |
SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,
|
| 710 |
scsi_completionfn completion, void *opaque)
|
| 711 |
{
|
| 712 |
int sg_version;
|
| 713 |
SCSIDevice *d; |
| 714 |
SCSIDeviceState *s; |
| 715 |
struct sg_scsi_id scsiid;
|
| 716 |
|
| 717 |
/* check we are really using a /dev/sg* file */
|
| 718 |
|
| 719 |
if (!bdrv_is_sg(bdrv))
|
| 720 |
return NULL; |
| 721 |
|
| 722 |
/* check we are using a driver managing SG_IO (version 3 and after */
|
| 723 |
|
| 724 |
if (bdrv_ioctl(bdrv, SG_GET_VERSION_NUM, &sg_version) < 0 || |
| 725 |
sg_version < 30000)
|
| 726 |
return NULL; |
| 727 |
|
| 728 |
/* get LUN of the /dev/sg? */
|
| 729 |
|
| 730 |
if (bdrv_ioctl(bdrv, SG_GET_SCSI_ID, &scsiid))
|
| 731 |
return NULL; |
| 732 |
|
| 733 |
/* define device state */
|
| 734 |
|
| 735 |
s = (SCSIDeviceState *)qemu_mallocz(sizeof(SCSIDeviceState));
|
| 736 |
s->bdrv = bdrv; |
| 737 |
s->requests = NULL;
|
| 738 |
s->completion = completion; |
| 739 |
s->opaque = opaque; |
| 740 |
s->lun = scsiid.lun; |
| 741 |
DPRINTF("LUN %d\n", s->lun);
|
| 742 |
s->type = scsiid.scsi_type; |
| 743 |
DPRINTF("device type %d\n", s->type);
|
| 744 |
if (s->type == TYPE_TAPE) {
|
| 745 |
s->blocksize = get_stream_blocksize(s->bdrv); |
| 746 |
if (s->blocksize == -1) |
| 747 |
s->blocksize = 0;
|
| 748 |
} else {
|
| 749 |
s->blocksize = get_blocksize(s->bdrv); |
| 750 |
/* removable media returns 0 if not present */
|
| 751 |
if (s->blocksize <= 0) { |
| 752 |
if (s->type == TYPE_ROM || s->type == TYPE_WORM)
|
| 753 |
s->blocksize = 2048;
|
| 754 |
else
|
| 755 |
s->blocksize = 512;
|
| 756 |
} |
| 757 |
} |
| 758 |
DPRINTF("block size %d\n", s->blocksize);
|
| 759 |
s->driver_status = 0;
|
| 760 |
memset(s->sensebuf, 0, sizeof(s->sensebuf)); |
| 761 |
|
| 762 |
/* define function to manage device */
|
| 763 |
|
| 764 |
d = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
| 765 |
d->state = s; |
| 766 |
d->destroy = scsi_destroy; |
| 767 |
d->send_command = scsi_send_command; |
| 768 |
d->read_data = scsi_read_data; |
| 769 |
d->write_data = scsi_write_data; |
| 770 |
d->cancel_io = scsi_cancel_io; |
| 771 |
d->get_buf = scsi_get_buf; |
| 772 |
|
| 773 |
return d;
|
| 774 |
} |
| 775 |
#endif /* __linux__ */ |