root / hw / scsi-disk.c @ 33f00271
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/*
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* SCSI Device emulation
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*
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* Copyright (c) 2006 CodeSourcery.
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* Based on code by Fabrice Bellard
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*
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* Written by Paul Brook
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*
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* This code is licenced under the LGPL.
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*
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* Note that this file only handles the SCSI architecture model and device
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* commands. Emultion of interface/link layer protocols is handled by
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* the host adapter emulation.
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*/
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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-disk: " 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-disk: " fmt , ##args); } while (0) |
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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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#define SENSE_NO_SENSE 0 |
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#define SENSE_NOT_READY 2 |
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#define SENSE_HARDWARE_ERROR 4 |
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#define SENSE_ILLEGAL_REQUEST 5 |
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#define SCSI_DMA_BUF_SIZE 65536 |
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typedef struct SCSIRequest { |
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SCSIDeviceState *dev; |
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uint32_t tag; |
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/* ??? We should probably keep track of whether the data trasfer is
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a read or a write. Currently we rely on the host getting it right. */
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/* Both sector and sector_count are in terms of qemu 512 byte blocks. */
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int sector;
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int sector_count;
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/* The amounnt of data in the buffer. */
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int buf_len;
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uint8_t *dma_buf; |
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BlockDriverAIOCB *aiocb; |
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struct SCSIRequest *next;
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} SCSIRequest; |
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struct SCSIDeviceState
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{ |
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BlockDriverState *bdrv; |
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SCSIRequest *requests; |
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/* The qemu block layer uses a fixed 512 byte sector size.
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This is the number of 512 byte blocks in a single scsi sector. */
|
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int cluster_size;
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int sense;
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int tcq;
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/* Completion functions may be called from either scsi_{read,write}_data
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or from the AIO completion routines. */
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scsi_completionfn completion; |
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void *opaque;
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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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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->dma_buf = qemu_memalign(512, SCSI_DMA_BUF_SIZE);
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} |
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r->dev = s; |
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r->tag = tag; |
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r->sector_count = 0;
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r->buf_len = 0;
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r->aiocb = NULL;
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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(SCSIRequest *r, int sense) |
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{ |
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SCSIDeviceState *s = r->dev; |
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uint32_t tag; |
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DPRINTF("Command complete tag=0x%x sense=%d\n", r->tag, sense);
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s->sense = 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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|
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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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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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|
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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; |
157 |
|
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if (ret) {
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DPRINTF("IO error\n");
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scsi_command_complete(r, SENSE_HARDWARE_ERROR); |
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return;
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} |
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DPRINTF("Data ready tag=0x%x len=%d\n", r->tag, r->buf_len);
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|
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s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->buf_len); |
166 |
} |
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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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uint32_t n; |
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|
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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, SENSE_HARDWARE_ERROR); |
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return;
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} |
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if (r->sector_count == (uint32_t)-1) { |
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DPRINTF("Read buf_len=%d\n", r->buf_len);
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r->sector_count = 0;
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s->completion(s->opaque, SCSI_REASON_DATA, r->tag, r->buf_len); |
186 |
return;
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} |
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DPRINTF("Read sector_count=%d\n", r->sector_count);
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if (r->sector_count == 0) { |
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scsi_command_complete(r, SENSE_NO_SENSE); |
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return;
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} |
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n = r->sector_count; |
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if (n > SCSI_DMA_BUF_SIZE / 512) |
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n = SCSI_DMA_BUF_SIZE / 512;
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|
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r->buf_len = n * 512;
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r->aiocb = bdrv_aio_read(s->bdrv, r->sector, r->dma_buf, n, |
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scsi_read_complete, r); |
201 |
if (r->aiocb == NULL) |
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scsi_command_complete(r, SENSE_HARDWARE_ERROR); |
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r->sector += n; |
204 |
r->sector_count -= n; |
205 |
} |
206 |
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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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SCSIDeviceState *s = r->dev; |
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uint32_t len; |
212 |
|
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if (ret) {
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fprintf(stderr, "scsi-disc: IO write error\n");
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exit(1);
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} |
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r->aiocb = NULL;
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if (r->sector_count == 0) { |
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scsi_command_complete(r, SENSE_NO_SENSE); |
221 |
} else {
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len = r->sector_count * 512;
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if (len > SCSI_DMA_BUF_SIZE) {
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len = SCSI_DMA_BUF_SIZE; |
225 |
} |
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r->buf_len = len; |
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DPRINTF("Write complete tag=0x%x more=%d\n", r->tag, len);
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s->completion(s->opaque, SCSI_REASON_DATA, r->tag, len); |
229 |
} |
230 |
} |
231 |
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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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uint32_t n; |
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DPRINTF("Write data tag=0x%x\n", tag);
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r = scsi_find_request(s, tag); |
242 |
if (!r) {
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BADF("Bad write tag 0x%x\n", tag);
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scsi_command_complete(r, SENSE_HARDWARE_ERROR); |
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return 1; |
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} |
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if (r->aiocb)
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BADF("Data transfer already in progress\n");
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n = r->buf_len / 512;
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if (n) {
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r->aiocb = bdrv_aio_write(s->bdrv, r->sector, r->dma_buf, n, |
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scsi_write_complete, r); |
253 |
if (r->aiocb == NULL) |
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scsi_command_complete(r, SENSE_HARDWARE_ERROR); |
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r->sector += n; |
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r->sector_count -= n; |
257 |
} else {
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/* Invoke completion routine to fetch data from host. */
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scsi_write_complete(r, 0);
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} |
261 |
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return 0; |
263 |
} |
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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; |
270 |
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r = scsi_find_request(s, tag); |
272 |
if (!r) {
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BADF("Bad buffer tag 0x%x\n", tag);
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return NULL; |
275 |
} |
276 |
return r->dma_buf;
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} |
278 |
|
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/* Execute a scsi command. Returns the length of the data expected by the
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command. This will be Positive for data transfers from the device
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(eg. disk reads), negative for transfers to the device (eg. disk writes),
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and zero if the command does not transfer any data. */
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|
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static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
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uint8_t *buf, int lun)
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{ |
287 |
SCSIDeviceState *s = d->state; |
288 |
uint64_t nb_sectors; |
289 |
uint32_t lba; |
290 |
uint32_t len; |
291 |
int cmdlen;
|
292 |
int is_write;
|
293 |
uint8_t command; |
294 |
uint8_t *outbuf; |
295 |
SCSIRequest *r; |
296 |
|
297 |
command = buf[0];
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r = scsi_find_request(s, tag); |
299 |
if (r) {
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300 |
BADF("Tag 0x%x already in use\n", tag);
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scsi_cancel_io(d, tag); |
302 |
} |
303 |
/* ??? Tags are not unique for different luns. We only implement a
|
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single lun, so this should not matter. */
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r = scsi_new_request(s, tag); |
306 |
outbuf = r->dma_buf; |
307 |
is_write = 0;
|
308 |
DPRINTF("Command: lun=%d tag=0x%x data=0x%02x", lun, tag, buf[0]); |
309 |
switch (command >> 5) { |
310 |
case 0: |
311 |
lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16); |
312 |
len = buf[4];
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cmdlen = 6;
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314 |
break;
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315 |
case 1: |
316 |
case 2: |
317 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
318 |
len = buf[8] | (buf[7] << 8); |
319 |
cmdlen = 10;
|
320 |
break;
|
321 |
case 4: |
322 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
323 |
len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24); |
324 |
cmdlen = 16;
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325 |
break;
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326 |
case 5: |
327 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
328 |
len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24); |
329 |
cmdlen = 12;
|
330 |
break;
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331 |
default:
|
332 |
BADF("Unsupported command length, command %x\n", command);
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333 |
goto fail;
|
334 |
} |
335 |
#ifdef DEBUG_SCSI
|
336 |
{ |
337 |
int i;
|
338 |
for (i = 1; i < cmdlen; i++) { |
339 |
printf(" 0x%02x", buf[i]);
|
340 |
} |
341 |
printf("\n");
|
342 |
} |
343 |
#endif
|
344 |
if (lun || buf[1] >> 5) { |
345 |
/* Only LUN 0 supported. */
|
346 |
DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5); |
347 |
goto fail;
|
348 |
} |
349 |
switch (command) {
|
350 |
case 0x0: |
351 |
DPRINTF("Test Unit Ready\n");
|
352 |
break;
|
353 |
case 0x03: |
354 |
DPRINTF("Request Sense (len %d)\n", len);
|
355 |
if (len < 4) |
356 |
goto fail;
|
357 |
memset(outbuf, 0, 4); |
358 |
outbuf[0] = 0xf0; |
359 |
outbuf[1] = 0; |
360 |
outbuf[2] = s->sense;
|
361 |
r->buf_len = 4;
|
362 |
break;
|
363 |
case 0x12: |
364 |
DPRINTF("Inquiry (len %d)\n", len);
|
365 |
if (len < 36) { |
366 |
BADF("Inquiry buffer too small (%d)\n", len);
|
367 |
} |
368 |
memset(outbuf, 0, 36); |
369 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
370 |
outbuf[0] = 5; |
371 |
outbuf[1] = 0x80; |
372 |
memcpy(&outbuf[16], "QEMU CD-ROM ", 16); |
373 |
} else {
|
374 |
outbuf[0] = 0; |
375 |
memcpy(&outbuf[16], "QEMU HARDDISK ", 16); |
376 |
} |
377 |
memcpy(&outbuf[8], "QEMU ", 8); |
378 |
memcpy(&outbuf[32], QEMU_VERSION, 4); |
379 |
/* Identify device as SCSI-3 rev 1.
|
380 |
Some later commands are also implemented. */
|
381 |
outbuf[2] = 3; |
382 |
outbuf[3] = 2; /* Format 2 */ |
383 |
outbuf[4] = 31; |
384 |
/* Sync data transfer and TCQ. */
|
385 |
outbuf[7] = 0x10 | (s->tcq ? 0x02 : 0); |
386 |
r->buf_len = 36;
|
387 |
break;
|
388 |
case 0x16: |
389 |
DPRINTF("Reserve(6)\n");
|
390 |
if (buf[1] & 1) |
391 |
goto fail;
|
392 |
break;
|
393 |
case 0x17: |
394 |
DPRINTF("Release(6)\n");
|
395 |
if (buf[1] & 1) |
396 |
goto fail;
|
397 |
break;
|
398 |
case 0x1a: |
399 |
case 0x5a: |
400 |
{ |
401 |
uint8_t *p; |
402 |
int page;
|
403 |
|
404 |
page = buf[2] & 0x3f; |
405 |
DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
|
406 |
p = outbuf; |
407 |
memset(p, 0, 4); |
408 |
outbuf[1] = 0; /* Default media type. */ |
409 |
outbuf[3] = 0; /* Block descriptor length. */ |
410 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
411 |
outbuf[2] = 0x80; /* Readonly. */ |
412 |
} |
413 |
p += 4;
|
414 |
if ((page == 8 || page == 0x3f)) { |
415 |
/* Caching page. */
|
416 |
memset(p,0,20); |
417 |
p[0] = 8; |
418 |
p[1] = 0x12; |
419 |
p[2] = 4; /* WCE */ |
420 |
p += 20;
|
421 |
} |
422 |
if ((page == 0x3f || page == 0x2a) |
423 |
&& (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM)) { |
424 |
/* CD Capabilities and Mechanical Status page. */
|
425 |
p[0] = 0x2a; |
426 |
p[1] = 0x14; |
427 |
p[2] = 3; // CD-R & CD-RW read |
428 |
p[3] = 0; // Writing not supported |
429 |
p[4] = 0x7f; /* Audio, composite, digital out, |
430 |
mode 2 form 1&2, multi session */
|
431 |
p[5] = 0xff; /* CD DA, DA accurate, RW supported, |
432 |
RW corrected, C2 errors, ISRC,
|
433 |
UPC, Bar code */
|
434 |
p[6] = 0x2d | (bdrv_is_locked(s->bdrv)? 2 : 0); |
435 |
/* Locking supported, jumper present, eject, tray */
|
436 |
p[7] = 0; /* no volume & mute control, no |
437 |
changer */
|
438 |
p[8] = (50 * 176) >> 8; // 50x read speed |
439 |
p[9] = (50 * 176) & 0xff; |
440 |
p[10] = 0 >> 8; // No volume |
441 |
p[11] = 0 & 0xff; |
442 |
p[12] = 2048 >> 8; // 2M buffer |
443 |
p[13] = 2048 & 0xff; |
444 |
p[14] = (16 * 176) >> 8; // 16x read speed current |
445 |
p[15] = (16 * 176) & 0xff; |
446 |
p[18] = (16 * 176) >> 8; // 16x write speed |
447 |
p[19] = (16 * 176) & 0xff; |
448 |
p[20] = (16 * 176) >> 8; // 16x write speed current |
449 |
p[21] = (16 * 176) & 0xff; |
450 |
p += 22;
|
451 |
} |
452 |
r->buf_len = p - outbuf; |
453 |
outbuf[0] = r->buf_len - 4; |
454 |
if (r->buf_len > len)
|
455 |
r->buf_len = len; |
456 |
} |
457 |
break;
|
458 |
case 0x1b: |
459 |
DPRINTF("Start Stop Unit\n");
|
460 |
break;
|
461 |
case 0x1e: |
462 |
DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3); |
463 |
bdrv_set_locked(s->bdrv, buf[4] & 1); |
464 |
break;
|
465 |
case 0x25: |
466 |
DPRINTF("Read Capacity\n");
|
467 |
/* The normal LEN field for this command is zero. */
|
468 |
memset(outbuf, 0, 8); |
469 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
470 |
/* Returned value is the address of the last sector. */
|
471 |
if (nb_sectors) {
|
472 |
nb_sectors--; |
473 |
outbuf[0] = (nb_sectors >> 24) & 0xff; |
474 |
outbuf[1] = (nb_sectors >> 16) & 0xff; |
475 |
outbuf[2] = (nb_sectors >> 8) & 0xff; |
476 |
outbuf[3] = nb_sectors & 0xff; |
477 |
outbuf[4] = 0; |
478 |
outbuf[5] = 0; |
479 |
outbuf[6] = s->cluster_size * 2; |
480 |
outbuf[7] = 0; |
481 |
r->buf_len = 8;
|
482 |
} else {
|
483 |
scsi_command_complete(r, SENSE_NOT_READY); |
484 |
return 0; |
485 |
} |
486 |
break;
|
487 |
case 0x08: |
488 |
case 0x28: |
489 |
DPRINTF("Read (sector %d, count %d)\n", lba, len);
|
490 |
r->sector = lba * s->cluster_size; |
491 |
r->sector_count = len * s->cluster_size; |
492 |
break;
|
493 |
case 0x0a: |
494 |
case 0x2a: |
495 |
DPRINTF("Write (sector %d, count %d)\n", lba, len);
|
496 |
r->sector = lba * s->cluster_size; |
497 |
r->sector_count = len * s->cluster_size; |
498 |
is_write = 1;
|
499 |
break;
|
500 |
case 0x35: |
501 |
DPRINTF("Synchronise cache (sector %d, count %d)\n", lba, len);
|
502 |
bdrv_flush(s->bdrv); |
503 |
break;
|
504 |
case 0x43: |
505 |
{ |
506 |
int start_track, format, msf, toclen;
|
507 |
|
508 |
msf = buf[1] & 2; |
509 |
format = buf[2] & 0xf; |
510 |
start_track = buf[6];
|
511 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
512 |
DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1); |
513 |
switch(format) {
|
514 |
case 0: |
515 |
toclen = cdrom_read_toc(nb_sectors, outbuf, msf, start_track); |
516 |
break;
|
517 |
case 1: |
518 |
/* multi session : only a single session defined */
|
519 |
toclen = 12;
|
520 |
memset(outbuf, 0, 12); |
521 |
outbuf[1] = 0x0a; |
522 |
outbuf[2] = 0x01; |
523 |
outbuf[3] = 0x01; |
524 |
break;
|
525 |
case 2: |
526 |
toclen = cdrom_read_toc_raw(nb_sectors, outbuf, msf, start_track); |
527 |
break;
|
528 |
default:
|
529 |
goto error_cmd;
|
530 |
} |
531 |
if (toclen > 0) { |
532 |
if (len > toclen)
|
533 |
len = toclen; |
534 |
r->buf_len = len; |
535 |
break;
|
536 |
} |
537 |
error_cmd:
|
538 |
DPRINTF("Read TOC error\n");
|
539 |
goto fail;
|
540 |
} |
541 |
case 0x46: |
542 |
DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len); |
543 |
memset(outbuf, 0, 8); |
544 |
/* ??? This shoud probably return much more information. For now
|
545 |
just return the basic header indicating the CD-ROM profile. */
|
546 |
outbuf[7] = 8; // CD-ROM |
547 |
r->buf_len = 8;
|
548 |
break;
|
549 |
case 0x56: |
550 |
DPRINTF("Reserve(10)\n");
|
551 |
if (buf[1] & 3) |
552 |
goto fail;
|
553 |
break;
|
554 |
case 0x57: |
555 |
DPRINTF("Release(10)\n");
|
556 |
if (buf[1] & 3) |
557 |
goto fail;
|
558 |
break;
|
559 |
case 0xa0: |
560 |
DPRINTF("Report LUNs (len %d)\n", len);
|
561 |
if (len < 16) |
562 |
goto fail;
|
563 |
memset(outbuf, 0, 16); |
564 |
outbuf[3] = 8; |
565 |
r->buf_len = 16;
|
566 |
break;
|
567 |
default:
|
568 |
DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]); |
569 |
fail:
|
570 |
scsi_command_complete(r, SENSE_ILLEGAL_REQUEST); |
571 |
return 0; |
572 |
} |
573 |
if (r->sector_count == 0 && r->buf_len == 0) { |
574 |
scsi_command_complete(r, SENSE_NO_SENSE); |
575 |
} |
576 |
len = r->sector_count * 512 + r->buf_len;
|
577 |
if (is_write) {
|
578 |
return -len;
|
579 |
} else {
|
580 |
if (!r->sector_count)
|
581 |
r->sector_count = -1;
|
582 |
return len;
|
583 |
} |
584 |
} |
585 |
|
586 |
static void scsi_destroy(SCSIDevice *d) |
587 |
{ |
588 |
qemu_free(d->state); |
589 |
qemu_free(d); |
590 |
} |
591 |
|
592 |
SCSIDevice *scsi_disk_init(BlockDriverState *bdrv, int tcq,
|
593 |
scsi_completionfn completion, void *opaque)
|
594 |
{ |
595 |
SCSIDevice *d; |
596 |
SCSIDeviceState *s; |
597 |
|
598 |
s = (SCSIDeviceState *)qemu_mallocz(sizeof(SCSIDeviceState));
|
599 |
s->bdrv = bdrv; |
600 |
s->tcq = tcq; |
601 |
s->completion = completion; |
602 |
s->opaque = opaque; |
603 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
604 |
s->cluster_size = 4;
|
605 |
} else {
|
606 |
s->cluster_size = 1;
|
607 |
} |
608 |
|
609 |
d = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
610 |
d->state = s; |
611 |
d->destroy = scsi_destroy; |
612 |
d->send_command = scsi_send_command; |
613 |
d->read_data = scsi_read_data; |
614 |
d->write_data = scsi_write_data; |
615 |
d->cancel_io = scsi_cancel_io; |
616 |
d->get_buf = scsi_get_buf; |
617 |
|
618 |
return d;
|
619 |
} |