root / hw / scsi-disk.c @ 7f27bae6
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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 "vl.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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SCSIDevice *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[SCSI_DMA_BUF_SIZE]; |
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BlockDriverAIOCB *aiocb; |
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struct SCSIRequest *next;
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} SCSIRequest; |
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|
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struct SCSIDevice
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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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/* Global pool of SCSIRequest structures. */
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static SCSIRequest *free_requests = NULL; |
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static SCSIRequest *scsi_new_request(SCSIDevice *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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} |
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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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static void scsi_remove_request(SCSIRequest *r) |
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{ |
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SCSIRequest *last; |
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SCSIDevice *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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static SCSIRequest *scsi_find_request(SCSIDevice *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(SCSIRequest *r, int sense) |
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{ |
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SCSIDevice *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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/* Cancel a pending data transfer. */
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void scsi_cancel_io(SCSIDevice *s, uint32_t tag)
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{ |
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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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SCSIDevice *s = r->dev; |
153 |
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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); |
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} |
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/* Read more data from scsi device into buffer. */
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void scsi_read_data(SCSIDevice *s, uint32_t tag)
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{ |
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SCSIRequest *r; |
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uint32_t n; |
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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); |
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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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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); |
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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; |
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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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SCSIDevice *s = r->dev; |
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uint32_t len; |
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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); |
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} 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; |
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} |
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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); |
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} |
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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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int scsi_write_data(SCSIDevice *s, uint32_t tag)
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{ |
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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); |
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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); |
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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; |
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} 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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} |
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return 0; |
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} |
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/* Return a pointer to the data buffer. */
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uint8_t *scsi_get_buf(SCSIDevice *s, uint32_t tag) |
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{ |
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SCSIRequest *r; |
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r = scsi_find_request(s, tag); |
265 |
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->dma_buf;
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} |
271 |
|
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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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int32_t scsi_send_command(SCSIDevice *s, uint32_t tag, uint8_t *buf, int lun)
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{ |
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int64_t nb_sectors; |
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uint32_t lba; |
281 |
uint32_t len; |
282 |
int cmdlen;
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int is_write;
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uint8_t command; |
285 |
uint8_t *outbuf; |
286 |
SCSIRequest *r; |
287 |
|
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command = buf[0];
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r = scsi_find_request(s, tag); |
290 |
if (r) {
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BADF("Tag 0x%x already in use\n", tag);
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scsi_cancel_io(s, tag); |
293 |
} |
294 |
/* ??? 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); |
297 |
outbuf = r->dma_buf; |
298 |
is_write = 0;
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DPRINTF("Command: lun=%d tag=0x%x data=0x%02x", lun, tag, buf[0]); |
300 |
switch (command >> 5) { |
301 |
case 0: |
302 |
lba = buf[3] | (buf[2] << 8) | ((buf[1] & 0x1f) << 16); |
303 |
len = buf[4];
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cmdlen = 6;
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break;
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306 |
case 1: |
307 |
case 2: |
308 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
309 |
len = buf[8] | (buf[7] << 8); |
310 |
cmdlen = 10;
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311 |
break;
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312 |
case 4: |
313 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
314 |
len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24); |
315 |
cmdlen = 16;
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316 |
break;
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317 |
case 5: |
318 |
lba = buf[5] | (buf[4] << 8) | (buf[3] << 16) | (buf[2] << 24); |
319 |
len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24); |
320 |
cmdlen = 12;
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321 |
break;
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322 |
default:
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323 |
BADF("Unsupported command length, command %x\n", command);
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324 |
goto fail;
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325 |
} |
326 |
#ifdef DEBUG_SCSI
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327 |
{ |
328 |
int i;
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329 |
for (i = 1; i < cmdlen; i++) { |
330 |
printf(" 0x%02x", buf[i]);
|
331 |
} |
332 |
printf("\n");
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333 |
} |
334 |
#endif
|
335 |
if (lun || buf[1] >> 5) { |
336 |
/* Only LUN 0 supported. */
|
337 |
DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5); |
338 |
goto fail;
|
339 |
} |
340 |
switch (command) {
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341 |
case 0x0: |
342 |
DPRINTF("Test Unit Ready\n");
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343 |
break;
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344 |
case 0x03: |
345 |
DPRINTF("Request Sense (len %d)\n", len);
|
346 |
if (len < 4) |
347 |
goto fail;
|
348 |
memset(outbuf, 0, 4); |
349 |
outbuf[0] = 0xf0; |
350 |
outbuf[1] = 0; |
351 |
outbuf[2] = s->sense;
|
352 |
r->buf_len = 4;
|
353 |
break;
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354 |
case 0x12: |
355 |
DPRINTF("Inquiry (len %d)\n", len);
|
356 |
if (len < 36) { |
357 |
BADF("Inquiry buffer too small (%d)\n", len);
|
358 |
} |
359 |
memset(outbuf, 0, 36); |
360 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
361 |
outbuf[0] = 5; |
362 |
outbuf[1] = 0x80; |
363 |
memcpy(&outbuf[16], "QEMU CD-ROM ", 16); |
364 |
} else {
|
365 |
outbuf[0] = 0; |
366 |
memcpy(&outbuf[16], "QEMU HARDDISK ", 16); |
367 |
} |
368 |
memcpy(&outbuf[8], "QEMU ", 8); |
369 |
memcpy(&outbuf[32], QEMU_VERSION, 4); |
370 |
/* Identify device as SCSI-3 rev 1.
|
371 |
Some later commands are also implemented. */
|
372 |
outbuf[2] = 3; |
373 |
outbuf[3] = 2; /* Format 2 */ |
374 |
outbuf[4] = 31; |
375 |
/* Sync data transfer and TCQ. */
|
376 |
outbuf[7] = 0x10 | (s->tcq ? 0x02 : 0); |
377 |
r->buf_len = 36;
|
378 |
break;
|
379 |
case 0x16: |
380 |
DPRINTF("Reserve(6)\n");
|
381 |
if (buf[1] & 1) |
382 |
goto fail;
|
383 |
break;
|
384 |
case 0x17: |
385 |
DPRINTF("Release(6)\n");
|
386 |
if (buf[1] & 1) |
387 |
goto fail;
|
388 |
break;
|
389 |
case 0x1a: |
390 |
case 0x5a: |
391 |
{ |
392 |
uint8_t *p; |
393 |
int page;
|
394 |
|
395 |
page = buf[2] & 0x3f; |
396 |
DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
|
397 |
p = outbuf; |
398 |
memset(p, 0, 4); |
399 |
outbuf[1] = 0; /* Default media type. */ |
400 |
outbuf[3] = 0; /* Block descriptor length. */ |
401 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
402 |
outbuf[2] = 0x80; /* Readonly. */ |
403 |
} |
404 |
p += 4;
|
405 |
if ((page == 8 || page == 0x3f)) { |
406 |
/* Caching page. */
|
407 |
memset(p,0,20); |
408 |
p[0] = 8; |
409 |
p[1] = 0x12; |
410 |
p[2] = 4; /* WCE */ |
411 |
p += 20;
|
412 |
} |
413 |
if ((page == 0x3f || page == 0x2a) |
414 |
&& (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM)) { |
415 |
/* CD Capabilities and Mechanical Status page. */
|
416 |
p[0] = 0x2a; |
417 |
p[1] = 0x14; |
418 |
p[2] = 3; // CD-R & CD-RW read |
419 |
p[3] = 0; // Writing not supported |
420 |
p[4] = 0x7f; /* Audio, composite, digital out, |
421 |
mode 2 form 1&2, multi session */
|
422 |
p[5] = 0xff; /* CD DA, DA accurate, RW supported, |
423 |
RW corrected, C2 errors, ISRC,
|
424 |
UPC, Bar code */
|
425 |
p[6] = 0x2d | (bdrv_is_locked(s->bdrv)? 2 : 0); |
426 |
/* Locking supported, jumper present, eject, tray */
|
427 |
p[7] = 0; /* no volume & mute control, no |
428 |
changer */
|
429 |
p[8] = (50 * 176) >> 8; // 50x read speed |
430 |
p[9] = (50 * 176) & 0xff; |
431 |
p[10] = 0 >> 8; // No volume |
432 |
p[11] = 0 & 0xff; |
433 |
p[12] = 2048 >> 8; // 2M buffer |
434 |
p[13] = 2048 & 0xff; |
435 |
p[14] = (16 * 176) >> 8; // 16x read speed current |
436 |
p[15] = (16 * 176) & 0xff; |
437 |
p[18] = (16 * 176) >> 8; // 16x write speed |
438 |
p[19] = (16 * 176) & 0xff; |
439 |
p[20] = (16 * 176) >> 8; // 16x write speed current |
440 |
p[21] = (16 * 176) & 0xff; |
441 |
p += 22;
|
442 |
} |
443 |
r->buf_len = p - outbuf; |
444 |
outbuf[0] = r->buf_len - 4; |
445 |
if (r->buf_len > len)
|
446 |
r->buf_len = len; |
447 |
} |
448 |
break;
|
449 |
case 0x1b: |
450 |
DPRINTF("Start Stop Unit\n");
|
451 |
break;
|
452 |
case 0x1e: |
453 |
DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3); |
454 |
bdrv_set_locked(s->bdrv, buf[4] & 1); |
455 |
break;
|
456 |
case 0x25: |
457 |
DPRINTF("Read Capacity\n");
|
458 |
/* The normal LEN field for this command is zero. */
|
459 |
memset(outbuf, 0, 8); |
460 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
461 |
/* Returned value is the address of the last sector. */
|
462 |
if (nb_sectors) {
|
463 |
nb_sectors--; |
464 |
outbuf[0] = (nb_sectors >> 24) & 0xff; |
465 |
outbuf[1] = (nb_sectors >> 16) & 0xff; |
466 |
outbuf[2] = (nb_sectors >> 8) & 0xff; |
467 |
outbuf[3] = nb_sectors & 0xff; |
468 |
outbuf[4] = 0; |
469 |
outbuf[5] = 0; |
470 |
outbuf[6] = s->cluster_size * 2; |
471 |
outbuf[7] = 0; |
472 |
r->buf_len = 8;
|
473 |
} else {
|
474 |
scsi_command_complete(r, SENSE_NOT_READY); |
475 |
return 0; |
476 |
} |
477 |
break;
|
478 |
case 0x08: |
479 |
case 0x28: |
480 |
DPRINTF("Read (sector %d, count %d)\n", lba, len);
|
481 |
r->sector = lba * s->cluster_size; |
482 |
r->sector_count = len * s->cluster_size; |
483 |
break;
|
484 |
case 0x0a: |
485 |
case 0x2a: |
486 |
DPRINTF("Write (sector %d, count %d)\n", lba, len);
|
487 |
r->sector = lba * s->cluster_size; |
488 |
r->sector_count = len * s->cluster_size; |
489 |
is_write = 1;
|
490 |
break;
|
491 |
case 0x35: |
492 |
DPRINTF("Synchronise cache (sector %d, count %d)\n", lba, len);
|
493 |
bdrv_flush(s->bdrv); |
494 |
break;
|
495 |
case 0x43: |
496 |
{ |
497 |
int start_track, format, msf, toclen;
|
498 |
|
499 |
msf = buf[1] & 2; |
500 |
format = buf[2] & 0xf; |
501 |
start_track = buf[6];
|
502 |
bdrv_get_geometry(s->bdrv, &nb_sectors); |
503 |
DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1); |
504 |
switch(format) {
|
505 |
case 0: |
506 |
toclen = cdrom_read_toc(nb_sectors, outbuf, msf, start_track); |
507 |
break;
|
508 |
case 1: |
509 |
/* multi session : only a single session defined */
|
510 |
toclen = 12;
|
511 |
memset(outbuf, 0, 12); |
512 |
outbuf[1] = 0x0a; |
513 |
outbuf[2] = 0x01; |
514 |
outbuf[3] = 0x01; |
515 |
break;
|
516 |
case 2: |
517 |
toclen = cdrom_read_toc_raw(nb_sectors, outbuf, msf, start_track); |
518 |
break;
|
519 |
default:
|
520 |
goto error_cmd;
|
521 |
} |
522 |
if (toclen > 0) { |
523 |
if (len > toclen)
|
524 |
len = toclen; |
525 |
r->buf_len = len; |
526 |
break;
|
527 |
} |
528 |
error_cmd:
|
529 |
DPRINTF("Read TOC error\n");
|
530 |
goto fail;
|
531 |
} |
532 |
case 0x46: |
533 |
DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len); |
534 |
memset(outbuf, 0, 8); |
535 |
/* ??? This shoud probably return much more information. For now
|
536 |
just return the basic header indicating the CD-ROM profile. */
|
537 |
outbuf[7] = 8; // CD-ROM |
538 |
r->buf_len = 8;
|
539 |
break;
|
540 |
case 0x56: |
541 |
DPRINTF("Reserve(10)\n");
|
542 |
if (buf[1] & 3) |
543 |
goto fail;
|
544 |
break;
|
545 |
case 0x57: |
546 |
DPRINTF("Release(10)\n");
|
547 |
if (buf[1] & 3) |
548 |
goto fail;
|
549 |
break;
|
550 |
case 0xa0: |
551 |
DPRINTF("Report LUNs (len %d)\n", len);
|
552 |
if (len < 16) |
553 |
goto fail;
|
554 |
memset(outbuf, 0, 16); |
555 |
outbuf[3] = 8; |
556 |
r->buf_len = 16;
|
557 |
break;
|
558 |
default:
|
559 |
DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]); |
560 |
fail:
|
561 |
scsi_command_complete(r, SENSE_ILLEGAL_REQUEST); |
562 |
return 0; |
563 |
} |
564 |
if (r->sector_count == 0 && r->buf_len == 0) { |
565 |
scsi_command_complete(r, SENSE_NO_SENSE); |
566 |
} |
567 |
len = r->sector_count * 512 + r->buf_len;
|
568 |
if (is_write) {
|
569 |
return -len;
|
570 |
} else {
|
571 |
if (!r->sector_count)
|
572 |
r->sector_count = -1;
|
573 |
return len;
|
574 |
} |
575 |
} |
576 |
|
577 |
void scsi_disk_destroy(SCSIDevice *s)
|
578 |
{ |
579 |
qemu_free(s); |
580 |
} |
581 |
|
582 |
SCSIDevice *scsi_disk_init(BlockDriverState *bdrv, |
583 |
int tcq,
|
584 |
scsi_completionfn completion, |
585 |
void *opaque)
|
586 |
{ |
587 |
SCSIDevice *s; |
588 |
|
589 |
s = (SCSIDevice *)qemu_mallocz(sizeof(SCSIDevice));
|
590 |
s->bdrv = bdrv; |
591 |
s->tcq = tcq; |
592 |
s->completion = completion; |
593 |
s->opaque = opaque; |
594 |
if (bdrv_get_type_hint(s->bdrv) == BDRV_TYPE_CDROM) {
|
595 |
s->cluster_size = 4;
|
596 |
} else {
|
597 |
s->cluster_size = 1;
|
598 |
} |
599 |
|
600 |
return s;
|
601 |
} |
602 |
|