root / hw / scsi-generic.c @ a245f2e7
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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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#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 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 32 |
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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 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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}; |
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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 sense;
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s->driver_status = r->io_header.driver_status; |
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if (ret != 0) |
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sense = HARDWARE_ERROR; |
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else {
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if (s->driver_status & SG_ERR_DRIVER_TIMEOUT) {
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sense = HARDWARE_ERROR; |
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BADF("Driver Timeout\n");
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} else if ((s->driver_status & SG_ERR_DRIVER_SENSE) == 0) |
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sense = NO_SENSE; |
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else
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sense = s->sensebuf[2] & 0x0f; |
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} |
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DPRINTF("Command complete 0x%p tag=0x%x sense=%d\n", r, r->tag, sense);
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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, sense); |
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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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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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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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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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} |
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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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memcpy(r->buf, s->sensebuf, 16);
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r->io_header.driver_status = 0;
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r->len = -1;
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s->completion(s->opaque, SCSI_REASON_DATA, r->tag, 16);
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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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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); |
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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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s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->len); |
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return 0; |
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} |
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ret = execute_command(s->bdrv, r, SG_DXFER_TO_DEV, scsi_write_complete); |
328 |
if (ret == -1) { |
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scsi_command_complete(r, -EINVAL); |
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return 1; |
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} |
332 |
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return 0; |
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} |
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|
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/* Return a pointer to the data buffer. */
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static uint8_t *scsi_get_buf(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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r = scsi_find_request(s, tag); |
342 |
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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|
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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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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); |
363 |
*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); |
367 |
*cmdlen = 12;
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break;
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default:
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return -1; |
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} |
372 |
|
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switch(cmd[0]) { |
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case TEST_UNIT_READY:
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375 |
case REZERO_UNIT:
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case START_STOP:
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377 |
case SEEK_6:
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case WRITE_FILEMARKS:
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379 |
case SPACE:
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380 |
case ERASE:
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381 |
case ALLOW_MEDIUM_REMOVAL:
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382 |
case VERIFY:
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383 |
case SEEK_10:
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384 |
case SYNCHRONIZE_CACHE:
|
385 |
case LOCK_UNLOCK_CACHE:
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386 |
case LOAD_UNLOAD:
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387 |
case SET_CD_SPEED:
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388 |
case SET_LIMITS:
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389 |
case WRITE_LONG:
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390 |
case MOVE_MEDIUM:
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391 |
case UPDATE_BLOCK:
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392 |
*len = 0;
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393 |
break;
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394 |
case MODE_SENSE:
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395 |
break;
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396 |
case WRITE_SAME:
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397 |
*len = 1;
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398 |
break;
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399 |
case READ_CAPACITY:
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400 |
*len = 8;
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401 |
break;
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402 |
case READ_BLOCK_LIMITS:
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403 |
*len = 6;
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404 |
break;
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405 |
case READ_POSITION:
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406 |
*len = 20;
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407 |
break;
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408 |
case SEND_VOLUME_TAG:
|
409 |
*len *= 40;
|
410 |
break;
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411 |
case MEDIUM_SCAN:
|
412 |
*len *= 8;
|
413 |
break;
|
414 |
case WRITE_10:
|
415 |
cmd[1] &= ~0x08; /* disable FUA */ |
416 |
case WRITE_VERIFY:
|
417 |
case WRITE_6:
|
418 |
case WRITE_12:
|
419 |
case WRITE_VERIFY_12:
|
420 |
*len *= blocksize; |
421 |
break;
|
422 |
case READ_10:
|
423 |
cmd[1] &= ~0x08; /* disable FUA */ |
424 |
case READ_6:
|
425 |
case READ_REVERSE:
|
426 |
case RECOVER_BUFFERED_DATA:
|
427 |
case READ_12:
|
428 |
*len *= blocksize; |
429 |
break;
|
430 |
} |
431 |
return 0; |
432 |
} |
433 |
|
434 |
static int is_write(int command) |
435 |
{ |
436 |
switch (command) {
|
437 |
case COPY:
|
438 |
case COPY_VERIFY:
|
439 |
case COMPARE:
|
440 |
case CHANGE_DEFINITION:
|
441 |
case LOG_SELECT:
|
442 |
case MODE_SELECT:
|
443 |
case MODE_SELECT_10:
|
444 |
case SEND_DIAGNOSTIC:
|
445 |
case WRITE_BUFFER:
|
446 |
case FORMAT_UNIT:
|
447 |
case REASSIGN_BLOCKS:
|
448 |
case RESERVE:
|
449 |
case SEARCH_EQUAL:
|
450 |
case SEARCH_HIGH:
|
451 |
case SEARCH_LOW:
|
452 |
case WRITE_6:
|
453 |
case WRITE_10:
|
454 |
case WRITE_VERIFY:
|
455 |
case UPDATE_BLOCK:
|
456 |
case WRITE_LONG:
|
457 |
case WRITE_SAME:
|
458 |
case SEARCH_HIGH_12:
|
459 |
case SEARCH_EQUAL_12:
|
460 |
case SEARCH_LOW_12:
|
461 |
case WRITE_12:
|
462 |
case WRITE_VERIFY_12:
|
463 |
case SET_WINDOW:
|
464 |
case MEDIUM_SCAN:
|
465 |
case SEND_VOLUME_TAG:
|
466 |
case WRITE_LONG_2:
|
467 |
return 1; |
468 |
} |
469 |
return 0; |
470 |
} |
471 |
|
472 |
/* Execute a scsi command. Returns the length of the data expected by the
|
473 |
command. This will be Positive for data transfers from the device
|
474 |
(eg. disk reads), negative for transfers to the device (eg. disk writes),
|
475 |
and zero if the command does not transfer any data. */
|
476 |
|
477 |
static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
|
478 |
uint8_t *cmd, int lun)
|
479 |
{ |
480 |
SCSIDeviceState *s = d->state; |
481 |
uint32_t len; |
482 |
int cmdlen;
|
483 |
SCSIRequest *r; |
484 |
int ret;
|
485 |
|
486 |
/* ??? Tags are not unique for different luns. We only implement a
|
487 |
single lun, so this should not matter. */
|
488 |
|
489 |
if (lun != s->lun || (cmd[1] >> 5) != s->lun) { |
490 |
DPRINTF("Unimplemented LUN %d\n", lun ? lun : cmd[1] >> 5); |
491 |
s->completion(s->opaque, SCSI_REASON_DONE, tag, ILLEGAL_REQUEST); |
492 |
return 0; |
493 |
} |
494 |
|
495 |
if (scsi_length(cmd, s->blocksize, &cmdlen, &len) == -1) { |
496 |
BADF("Unsupported command length, command %x\n", cmd[0]); |
497 |
return 0; |
498 |
} |
499 |
|
500 |
DPRINTF("Command: lun=%d tag=0x%x data=0x%02x len %d\n", lun, tag,
|
501 |
cmd[0], len);
|
502 |
|
503 |
r = scsi_find_request(s, tag); |
504 |
if (r) {
|
505 |
BADF("Tag 0x%x already in use %p\n", tag, r);
|
506 |
scsi_cancel_io(d, tag); |
507 |
} |
508 |
r = scsi_new_request(s, tag); |
509 |
|
510 |
memcpy(r->cmd, cmd, cmdlen); |
511 |
r->cmdlen = cmdlen; |
512 |
|
513 |
if (len == 0) { |
514 |
if (r->buf != NULL) |
515 |
free(r->buf); |
516 |
r->buflen = 0;
|
517 |
r->buf = NULL;
|
518 |
ret = execute_command(s->bdrv, r, SG_DXFER_NONE, scsi_command_complete); |
519 |
if (ret == -1) { |
520 |
scsi_command_complete(r, -EINVAL); |
521 |
return 0; |
522 |
} |
523 |
return 0; |
524 |
} |
525 |
|
526 |
if (r->buflen != len) {
|
527 |
if (r->buf != NULL) |
528 |
free(r->buf); |
529 |
r->buf = qemu_malloc(len); |
530 |
r->buflen = len; |
531 |
} |
532 |
|
533 |
memset(r->buf, 0, r->buflen);
|
534 |
r->len = len; |
535 |
if (is_write(cmd[0])) { |
536 |
r->len = 0;
|
537 |
return -len;
|
538 |
} |
539 |
|
540 |
return len;
|
541 |
} |
542 |
|
543 |
static int get_blocksize(BlockDriverState *bdrv) |
544 |
{ |
545 |
uint8_t cmd[10];
|
546 |
uint8_t buf[8];
|
547 |
uint8_t sensebuf[8];
|
548 |
sg_io_hdr_t io_header; |
549 |
int ret;
|
550 |
|
551 |
memset(cmd, sizeof(cmd), 0); |
552 |
memset(buf, sizeof(buf), 0); |
553 |
cmd[0] = READ_CAPACITY;
|
554 |
|
555 |
memset(&io_header, 0, sizeof(io_header)); |
556 |
io_header.interface_id = 'S';
|
557 |
io_header.dxfer_direction = SG_DXFER_FROM_DEV; |
558 |
io_header.dxfer_len = sizeof(buf);
|
559 |
io_header.dxferp = buf; |
560 |
io_header.cmdp = cmd; |
561 |
io_header.cmd_len = sizeof(cmd);
|
562 |
io_header.mx_sb_len = sizeof(sensebuf);
|
563 |
io_header.sbp = sensebuf; |
564 |
io_header.timeout = 6000; /* XXX */ |
565 |
|
566 |
ret = bdrv_pwrite(bdrv, -1, &io_header, sizeof(io_header)); |
567 |
if (ret == -1) |
568 |
return -1; |
569 |
|
570 |
while ((ret = bdrv_pread(bdrv, -1, &io_header, sizeof(io_header))) == -1 && |
571 |
errno == EINTR); |
572 |
|
573 |
if (ret == -1) |
574 |
return -1; |
575 |
|
576 |
return (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; |
577 |
} |
578 |
|
579 |
static void scsi_destroy(SCSIDevice *d) |
580 |
{ |
581 |
SCSIRequest *r, *n; |
582 |
|
583 |
r = d->state->requests; |
584 |
while (r) {
|
585 |
n = r->next; |
586 |
qemu_free(r); |
587 |
r = n; |
588 |
} |
589 |
|
590 |
r = free_requests; |
591 |
while (r) {
|
592 |
n = r->next; |
593 |
qemu_free(r); |
594 |
r = n; |
595 |
} |
596 |
|
597 |
qemu_free(d->state); |
598 |
qemu_free(d); |
599 |
} |
600 |
|
601 |
SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,
|
602 |
scsi_completionfn completion, void *opaque)
|
603 |
{ |
604 |
int sg_version;
|
605 |
SCSIDevice *d; |
606 |
SCSIDeviceState *s; |
607 |
struct sg_scsi_id scsiid;
|
608 |
|
609 |
/* check we are really using a /dev/sg* file */
|
610 |
|
611 |
if (!bdrv_is_sg(bdrv))
|
612 |
return NULL; |
613 |
|
614 |
/* check we are using a driver managing SG_IO (version 3 and after */
|
615 |
|
616 |
if (bdrv_ioctl(bdrv, SG_GET_VERSION_NUM, &sg_version) < 0 || |
617 |
sg_version < 30000)
|
618 |
return NULL; |
619 |
|
620 |
/* get LUN of the /dev/sg? */
|
621 |
|
622 |
if (bdrv_ioctl(bdrv, SG_GET_SCSI_ID, &scsiid))
|
623 |
return NULL; |
624 |
|
625 |
/* define device state */
|
626 |
|
627 |
s = (SCSIDeviceState *)qemu_mallocz(sizeof(SCSIDeviceState));
|
628 |
s->bdrv = bdrv; |
629 |
s->requests = NULL;
|
630 |
s->completion = completion; |
631 |
s->opaque = opaque; |
632 |
s->lun = scsiid.lun; |
633 |
s->blocksize = get_blocksize(s->bdrv); |
634 |
s->driver_status = 0;
|
635 |
memset(s->sensebuf, 0, sizeof(s->sensebuf)); |
636 |
/* removable media returns 0 if not present */
|
637 |
if (s->blocksize <= 0) |
638 |
s->blocksize = 2048;
|
639 |
|
640 |
/* define function to manage device */
|
641 |
|
642 |
d = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
643 |
d->state = s; |
644 |
d->destroy = scsi_destroy; |
645 |
d->send_command = scsi_send_command; |
646 |
d->read_data = scsi_read_data; |
647 |
d->write_data = scsi_write_data; |
648 |
d->cancel_io = scsi_cancel_io; |
649 |
d->get_buf = scsi_get_buf; |
650 |
|
651 |
return d;
|
652 |
} |
653 |
#endif /* __linux__ */ |