2 * Generic SCSI Device support
4 * Copyright (c) 2007 Bull S.A.S.
5 * Based on code by Paul Brook
6 * Based on code by Fabrice Bellard
10 * This code is licensed under the LGPL.
14 #include "qemu/osdep.h"
15 #include "qapi/error.h"
16 #include "qemu-common.h"
17 #include "qemu/error-report.h"
18 #include "hw/scsi/scsi.h"
19 #include "sysemu/block-backend.h"
20 #include "sysemu/blockdev.h"
27 #define DPRINTF(fmt, ...) \
28 do { printf("scsi-generic: " fmt , ## __VA_ARGS__); } while (0)
30 #define DPRINTF(fmt, ...) do {} while(0)
33 #define BADF(fmt, ...) \
34 do { fprintf(stderr, "scsi-generic: " fmt , ## __VA_ARGS__); } while (0)
37 #include "block/scsi.h"
39 #define SG_ERR_DRIVER_TIMEOUT 0x06
40 #define SG_ERR_DRIVER_SENSE 0x08
42 #define SG_ERR_DID_OK 0x00
43 #define SG_ERR_DID_NO_CONNECT 0x01
44 #define SG_ERR_DID_BUS_BUSY 0x02
45 #define SG_ERR_DID_TIME_OUT 0x03
48 #define MAX_UINT ((unsigned int)-1)
51 typedef struct SCSIGenericReq {
56 sg_io_hdr_t io_header;
59 static void scsi_generic_save_request(QEMUFile *f, SCSIRequest *req)
61 SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
63 qemu_put_sbe32s(f, &r->buflen);
64 if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) {
66 qemu_put_buffer(f, r->buf, r->req.cmd.xfer);
70 static void scsi_generic_load_request(QEMUFile *f, SCSIRequest *req)
72 SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
74 qemu_get_sbe32s(f, &r->buflen);
75 if (r->buflen && r->req.cmd.mode == SCSI_XFER_TO_DEV) {
77 qemu_get_buffer(f, r->buf, r->req.cmd.xfer);
81 static void scsi_free_request(SCSIRequest *req)
83 SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
88 /* Helper function for command completion. */
89 static void scsi_command_complete_noio(SCSIGenericReq *r, int ret)
93 assert(r->req.aiocb == NULL);
95 if (r->req.io_canceled) {
96 scsi_req_cancel_complete(&r->req);
99 if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
100 r->req.sense_len = r->io_header.sb_len_wr;
106 status = TASK_SET_FULL;
109 status = CHECK_CONDITION;
110 scsi_req_build_sense(&r->req, SENSE_CODE(TARGET_FAILURE));
113 status = CHECK_CONDITION;
114 scsi_req_build_sense(&r->req, SENSE_CODE(IO_ERROR));
118 if (r->io_header.host_status == SG_ERR_DID_NO_CONNECT ||
119 r->io_header.host_status == SG_ERR_DID_BUS_BUSY ||
120 r->io_header.host_status == SG_ERR_DID_TIME_OUT ||
121 (r->io_header.driver_status & SG_ERR_DRIVER_TIMEOUT)) {
123 BADF("Driver Timeout\n");
124 } else if (r->io_header.host_status) {
125 status = CHECK_CONDITION;
126 scsi_req_build_sense(&r->req, SENSE_CODE(I_T_NEXUS_LOSS));
127 } else if (r->io_header.status) {
128 status = r->io_header.status;
129 } else if (r->io_header.driver_status & SG_ERR_DRIVER_SENSE) {
130 status = CHECK_CONDITION;
135 DPRINTF("Command complete 0x%p tag=0x%x status=%d\n",
136 r, r->req.tag, status);
138 scsi_req_complete(&r->req, status);
140 scsi_req_unref(&r->req);
143 static void scsi_command_complete(void *opaque, int ret)
145 SCSIGenericReq *r = (SCSIGenericReq *)opaque;
147 assert(r->req.aiocb != NULL);
149 scsi_command_complete_noio(r, ret);
152 static int execute_command(BlockBackend *blk,
153 SCSIGenericReq *r, int direction,
154 BlockCompletionFunc *complete)
156 r->io_header.interface_id = 'S';
157 r->io_header.dxfer_direction = direction;
158 r->io_header.dxferp = r->buf;
159 r->io_header.dxfer_len = r->buflen;
160 r->io_header.cmdp = r->req.cmd.buf;
161 r->io_header.cmd_len = r->req.cmd.len;
162 r->io_header.mx_sb_len = sizeof(r->req.sense);
163 r->io_header.sbp = r->req.sense;
164 r->io_header.timeout = MAX_UINT;
165 r->io_header.usr_ptr = r;
166 r->io_header.flags |= SG_FLAG_DIRECT_IO;
168 r->req.aiocb = blk_aio_ioctl(blk, SG_IO, &r->io_header, complete, r);
169 if (r->req.aiocb == NULL) {
176 static void scsi_read_complete(void * opaque, int ret)
178 SCSIGenericReq *r = (SCSIGenericReq *)opaque;
179 SCSIDevice *s = r->req.dev;
182 assert(r->req.aiocb != NULL);
185 if (ret || r->req.io_canceled) {
186 scsi_command_complete_noio(r, ret);
190 len = r->io_header.dxfer_len - r->io_header.resid;
191 DPRINTF("Data ready tag=0x%x len=%d\n", r->req.tag, len);
195 scsi_command_complete_noio(r, 0);
199 /* Snoop READ CAPACITY output to set the blocksize. */
200 if (r->req.cmd.buf[0] == READ_CAPACITY_10 &&
201 (ldl_be_p(&r->buf[0]) != 0xffffffffU || s->max_lba == 0)) {
202 s->blocksize = ldl_be_p(&r->buf[4]);
203 s->max_lba = ldl_be_p(&r->buf[0]) & 0xffffffffULL;
204 } else if (r->req.cmd.buf[0] == SERVICE_ACTION_IN_16 &&
205 (r->req.cmd.buf[1] & 31) == SAI_READ_CAPACITY_16) {
206 s->blocksize = ldl_be_p(&r->buf[8]);
207 s->max_lba = ldq_be_p(&r->buf[0]);
209 blk_set_guest_block_size(s->conf.blk, s->blocksize);
211 /* Patch MODE SENSE device specific parameters if the BDS is opened
214 if ((s->type == TYPE_DISK || s->type == TYPE_TAPE) &&
215 blk_is_read_only(s->conf.blk) &&
216 (r->req.cmd.buf[0] == MODE_SENSE ||
217 r->req.cmd.buf[0] == MODE_SENSE_10) &&
218 (r->req.cmd.buf[1] & 0x8) == 0) {
219 if (r->req.cmd.buf[0] == MODE_SENSE) {
225 scsi_req_data(&r->req, len);
226 scsi_req_unref(&r->req);
229 /* Read more data from scsi device into buffer. */
230 static void scsi_read_data(SCSIRequest *req)
232 SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
233 SCSIDevice *s = r->req.dev;
236 DPRINTF("scsi_read_data 0x%x\n", req->tag);
238 /* The request is used as the AIO opaque value, so add a ref. */
239 scsi_req_ref(&r->req);
241 scsi_command_complete_noio(r, 0);
245 ret = execute_command(s->conf.blk, r, SG_DXFER_FROM_DEV,
248 scsi_command_complete_noio(r, ret);
252 static void scsi_write_complete(void * opaque, int ret)
254 SCSIGenericReq *r = (SCSIGenericReq *)opaque;
255 SCSIDevice *s = r->req.dev;
257 DPRINTF("scsi_write_complete() ret = %d\n", ret);
259 assert(r->req.aiocb != NULL);
262 if (ret || r->req.io_canceled) {
263 scsi_command_complete_noio(r, ret);
267 if (r->req.cmd.buf[0] == MODE_SELECT && r->req.cmd.buf[4] == 12 &&
268 s->type == TYPE_TAPE) {
269 s->blocksize = (r->buf[9] << 16) | (r->buf[10] << 8) | r->buf[11];
270 DPRINTF("block size %d\n", s->blocksize);
273 scsi_command_complete_noio(r, ret);
276 /* Write data to a scsi device. Returns nonzero on failure.
277 The transfer may complete asynchronously. */
278 static void scsi_write_data(SCSIRequest *req)
280 SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
281 SCSIDevice *s = r->req.dev;
284 DPRINTF("scsi_write_data 0x%x\n", req->tag);
287 scsi_req_data(&r->req, r->len);
291 /* The request is used as the AIO opaque value, so add a ref. */
292 scsi_req_ref(&r->req);
293 ret = execute_command(s->conf.blk, r, SG_DXFER_TO_DEV, scsi_write_complete);
295 scsi_command_complete_noio(r, ret);
299 /* Return a pointer to the data buffer. */
300 static uint8_t *scsi_get_buf(SCSIRequest *req)
302 SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
307 /* Execute a scsi command. Returns the length of the data expected by the
308 command. This will be Positive for data transfers from the device
309 (eg. disk reads), negative for transfers to the device (eg. disk writes),
310 and zero if the command does not transfer any data. */
312 static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
314 SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
315 SCSIDevice *s = r->req.dev;
321 for (i = 1; i < r->req.cmd.len; i++) {
322 printf(" 0x%02x", cmd[i]);
328 if (r->req.cmd.xfer == 0) {
332 /* The request is used as the AIO opaque value, so add a ref. */
333 scsi_req_ref(&r->req);
334 ret = execute_command(s->conf.blk, r, SG_DXFER_NONE,
335 scsi_command_complete);
337 scsi_command_complete_noio(r, ret);
343 if (r->buflen != r->req.cmd.xfer) {
345 r->buf = g_malloc(r->req.cmd.xfer);
346 r->buflen = r->req.cmd.xfer;
349 memset(r->buf, 0, r->buflen);
350 r->len = r->req.cmd.xfer;
351 if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
353 return -r->req.cmd.xfer;
355 return r->req.cmd.xfer;
359 static int read_naa_id(const uint8_t *p, uint64_t *p_wwn)
363 if ((p[1] & 0xF) == 3) {
364 /* NAA designator type */
368 *p_wwn = ldq_be_p(p + 4);
372 if ((p[1] & 0xF) == 8) {
373 /* SCSI name string designator type */
374 if (p[3] < 20 || memcmp(&p[4], "naa.", 4)) {
377 if (p[3] > 20 && p[24] != ',') {
381 for (i = 8; i < 24; i++) {
382 char c = toupper(p[i]);
383 c -= (c >= '0' && c <= '9' ? '0' : 'A' - 10);
384 *p_wwn = (*p_wwn << 4) | c;
392 void scsi_generic_read_device_identification(SCSIDevice *s)
397 sg_io_hdr_t io_header;
401 memset(cmd, 0, sizeof(cmd));
402 memset(buf, 0, sizeof(buf));
406 cmd[4] = sizeof(buf);
408 memset(&io_header, 0, sizeof(io_header));
409 io_header.interface_id = 'S';
410 io_header.dxfer_direction = SG_DXFER_FROM_DEV;
411 io_header.dxfer_len = sizeof(buf);
412 io_header.dxferp = buf;
413 io_header.cmdp = cmd;
414 io_header.cmd_len = sizeof(cmd);
415 io_header.mx_sb_len = sizeof(sensebuf);
416 io_header.sbp = sensebuf;
417 io_header.timeout = 6000; /* XXX */
419 ret = blk_ioctl(s->conf.blk, SG_IO, &io_header);
420 if (ret < 0 || io_header.driver_status || io_header.host_status) {
424 len = MIN((buf[2] << 8) | buf[3], sizeof(buf) - 4);
425 for (i = 0; i + 3 <= len; ) {
426 const uint8_t *p = &buf[i + 4];
429 if (i + (p[3] + 4) > len) {
433 if ((p[1] & 0x10) == 0) {
434 /* Associated with the logical unit */
435 if (read_naa_id(p, &wwn) == 0) {
438 } else if ((p[1] & 0x10) == 0x10) {
439 /* Associated with the target port */
440 if (read_naa_id(p, &wwn) == 0) {
449 static int get_stream_blocksize(BlockBackend *blk)
454 sg_io_hdr_t io_header;
457 memset(cmd, 0, sizeof(cmd));
458 memset(buf, 0, sizeof(buf));
460 cmd[4] = sizeof(buf);
462 memset(&io_header, 0, sizeof(io_header));
463 io_header.interface_id = 'S';
464 io_header.dxfer_direction = SG_DXFER_FROM_DEV;
465 io_header.dxfer_len = sizeof(buf);
466 io_header.dxferp = buf;
467 io_header.cmdp = cmd;
468 io_header.cmd_len = sizeof(cmd);
469 io_header.mx_sb_len = sizeof(sensebuf);
470 io_header.sbp = sensebuf;
471 io_header.timeout = 6000; /* XXX */
473 ret = blk_ioctl(blk, SG_IO, &io_header);
474 if (ret < 0 || io_header.driver_status || io_header.host_status) {
477 return (buf[9] << 16) | (buf[10] << 8) | buf[11];
480 static void scsi_generic_reset(DeviceState *dev)
482 SCSIDevice *s = SCSI_DEVICE(dev);
484 scsi_device_purge_requests(s, SENSE_CODE(RESET));
487 static void scsi_generic_realize(SCSIDevice *s, Error **errp)
491 struct sg_scsi_id scsiid;
494 error_setg(errp, "drive property not set");
498 if (blk_get_on_error(s->conf.blk, 0) != BLOCKDEV_ON_ERROR_ENOSPC) {
499 error_setg(errp, "Device doesn't support drive option werror");
502 if (blk_get_on_error(s->conf.blk, 1) != BLOCKDEV_ON_ERROR_REPORT) {
503 error_setg(errp, "Device doesn't support drive option rerror");
507 /* check we are using a driver managing SG_IO (version 3 and after */
508 rc = blk_ioctl(s->conf.blk, SG_GET_VERSION_NUM, &sg_version);
510 error_setg(errp, "cannot get SG_IO version number: %s. "
511 "Is this a SCSI device?",
515 if (sg_version < 30000) {
516 error_setg(errp, "scsi generic interface too old");
520 /* get LUN of the /dev/sg? */
521 if (blk_ioctl(s->conf.blk, SG_GET_SCSI_ID, &scsiid)) {
522 error_setg(errp, "SG_GET_SCSI_ID ioctl failed");
526 /* define device state */
527 s->type = scsiid.scsi_type;
528 DPRINTF("device type %d\n", s->type);
532 s->blocksize = get_stream_blocksize(s->conf.blk);
533 if (s->blocksize == -1) {
538 /* Make a guess for block devices, we'll fix it when the guest sends.
539 * READ CAPACITY. If they don't, they likely would assume these sizes
540 * anyway. (TODO: they could also send MODE SENSE).
551 DPRINTF("block size %d\n", s->blocksize);
553 scsi_generic_read_device_identification(s);
556 const SCSIReqOps scsi_generic_req_ops = {
557 .size = sizeof(SCSIGenericReq),
558 .free_req = scsi_free_request,
559 .send_command = scsi_send_command,
560 .read_data = scsi_read_data,
561 .write_data = scsi_write_data,
562 .get_buf = scsi_get_buf,
563 .load_request = scsi_generic_load_request,
564 .save_request = scsi_generic_save_request,
567 static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag, uint32_t lun,
568 uint8_t *buf, void *hba_private)
572 req = scsi_req_alloc(&scsi_generic_req_ops, d, tag, lun, hba_private);
576 static Property scsi_generic_properties[] = {
577 DEFINE_PROP_DRIVE("drive", SCSIDevice, conf.blk),
578 DEFINE_PROP_END_OF_LIST(),
581 static int scsi_generic_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
582 uint8_t *buf, void *hba_private)
584 return scsi_bus_parse_cdb(dev, cmd, buf, hba_private);
587 static void scsi_generic_class_initfn(ObjectClass *klass, void *data)
589 DeviceClass *dc = DEVICE_CLASS(klass);
590 SCSIDeviceClass *sc = SCSI_DEVICE_CLASS(klass);
592 sc->realize = scsi_generic_realize;
593 sc->alloc_req = scsi_new_request;
594 sc->parse_cdb = scsi_generic_parse_cdb;
595 dc->fw_name = "disk";
596 dc->desc = "pass through generic scsi device (/dev/sg*)";
597 dc->reset = scsi_generic_reset;
598 dc->props = scsi_generic_properties;
599 dc->vmsd = &vmstate_scsi_device;
602 static const TypeInfo scsi_generic_info = {
603 .name = "scsi-generic",
604 .parent = TYPE_SCSI_DEVICE,
605 .instance_size = sizeof(SCSIDevice),
606 .class_init = scsi_generic_class_initfn,
609 static void scsi_generic_register_types(void)
611 type_register_static(&scsi_generic_info);
614 type_init(scsi_generic_register_types)
616 #endif /* __linux__ */