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kernel: Remove some unneeded NULL checks after kmalloc() with M_WAITOK.
[dragonfly.git] / sys / bus / cam / scsi / scsi_sg.c
CommitLineData
388705e4
MD		 1/*-
2 * Copyright (c) 2007 Scott Long
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions, and the following disclaimer,
10 * without modification, immediately at the beginning of the file.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
18 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27/*
28 * scsi_sg peripheral driver. This driver is meant to implement the Linux
29 * SG passthrough interface for SCSI.
30 */
31
32#include <sys/conf.h>
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/kernel.h>
36#include <sys/types.h>
37#include <sys/bio.h>
38#include <sys/malloc.h>
39#include <sys/fcntl.h>
40#include <sys/ioccom.h>
41#include <sys/errno.h>
42#include <sys/devicestat.h>
43#include <sys/proc.h>
44#include <sys/uio.h>
45#include <sys/device.h>
46#include <sys/sysmsg.h>
47
48#include "../cam.h"
49#include "../cam_ccb.h"
50#include "../cam_periph.h"
51#include "../cam_queue.h"
52#include "../cam_xpt_periph.h"
53#include "../cam_debug.h"
54#include "../cam_sim.h"
55
56#include <emulation/linux/linux_ioctl.h>
57
58#include "scsi_all.h"
59#include "scsi_message.h"
60#include "scsi_sg.h"
61
62typedef enum {
63 SG_FLAG_OPEN = 0x01,
64 SG_FLAG_LOCKED = 0x02,
65 SG_FLAG_INVALID = 0x04
66} sg_flags;
67
68typedef enum {
69 SG_STATE_NORMAL
70} sg_state;
71
72typedef enum {
73 SG_RDWR_FREE,
74 SG_RDWR_INPROG,
75 SG_RDWR_DONE
76} sg_rdwr_state;
77
78typedef enum {
79 SG_CCB_RDWR_IO,
80 SG_CCB_WAITING
81} sg_ccb_types;
82
83#define ccb_type ppriv_field0
84#define ccb_rdwr ppriv_ptr1
85
86struct sg_rdwr {
87 TAILQ_ENTRY(sg_rdwr) rdwr_link;
88 int tag;
89 int state;
90 int buf_len;
91 char *buf;
92 union ccb *ccb;
93 union {
94 struct sg_header hdr;
95 struct sg_io_hdr io_hdr;
96 } hdr;
97};
98
99struct sg_softc {
100 sg_state state;
101 sg_flags flags;
102 struct devstat device_stats;
103 TAILQ_HEAD(, sg_rdwr) rdwr_done;
104 cdev_t dev;
105 int sg_timeout;
106 int sg_user_timeout;
107 uint8_t pd_type;
108 union ccb saved_ccb;
109};
110
111static d_open_t sgopen;
112static d_close_t sgclose;
113static d_ioctl_t sgioctl;
114static d_write_t sgwrite;
115static d_read_t sgread;
116
117static periph_init_t sginit;
118static periph_ctor_t sgregister;
119static periph_oninv_t sgoninvalidate;
120static periph_dtor_t sgcleanup;
121static periph_start_t sgstart;
122static void sgasync(void *callback_arg, uint32_t code,
123 struct cam_path *path, void *arg);
124static void sgdone(struct cam_periph *periph, union ccb *done_ccb);
125static int sgsendccb(struct cam_periph *periph, union ccb *ccb);
126static int sgsendrdwr(struct cam_periph *periph, union ccb *ccb);
127static int sgerror(union ccb *ccb, uint32_t cam_flags,
128 uint32_t sense_flags);
129static void sg_scsiio_status(struct ccb_scsiio *csio,
130 u_short *hoststat, u_short *drvstat);
131
132static int scsi_group_len(u_char cmd);
133
134static struct periph_driver sgdriver =
135{
136 sginit, "sg",
137 TAILQ_HEAD_INITIALIZER(sgdriver.units), /* gen */ 0
138};
139PERIPHDRIVER_DECLARE(sg, sgdriver);
140
141static struct dev_ops sg_ops = {
142 { "sg", 0, D_DISK },
143 .d_open = sgopen,
144 .d_close = sgclose,
145 .d_read = sgread,
146 .d_write = sgwrite,
147 .d_ioctl = sgioctl
148};
149
150static int sg_version = 30125;
151
152static void
153sginit(void)
154{
155 cam_status status;
156
157 /*
158 * Install a global async callback. This callback will receive aync
159 * callbacks like "new device found".
160 */
161 status = xpt_register_async(AC_FOUND_DEVICE, sgasync, NULL, NULL);
162
163 if (status != CAM_REQ_CMP) {
164 kprintf("sg: Failed to attach master async callbac "
165 "due to status 0x%x!\n", status);
166 }
167}
168
169static void
170sgoninvalidate(struct cam_periph *periph)
171{
172 struct sg_softc *softc;
173
174 softc = (struct sg_softc *)periph->softc;
175
176 /*
177 * Deregister any async callbacks.
178 */
179 xpt_register_async(0, sgasync, periph, periph->path);
180
181 softc->flags |= SG_FLAG_INVALID;
182
183 /*
184 * XXX Return all queued I/O with ENXIO.
185 * XXX Handle any transactions queued to the card
186 * with XPT_ABORT_CCB.
187 */
188
189 if (bootverbose) {
190 xpt_print(periph->path, "lost device\n");
191 }
192}
193
194static void
195sgcleanup(struct cam_periph *periph)
196{
197 struct sg_softc *softc;
198
199 softc = (struct sg_softc *)periph->softc;
200 if (bootverbose)
201 xpt_print(periph->path, "removing device entry\n");
202 devstat_remove_entry(&softc->device_stats);
203 cam_periph_unlock(periph);
204 destroy_dev(softc->dev);
205 cam_periph_lock(periph);
206 kfree(softc, M_DEVBUF);
207}
208
209static void
210sgasync(void *callback_arg, uint32_t code, struct cam_path *path, void *arg)
211{
212 struct cam_periph *periph;
213
214 periph = (struct cam_periph *)callback_arg;
215
216 switch (code) {
217 case AC_FOUND_DEVICE:
218 {
219 struct ccb_getdev *cgd;
220 cam_status status;
221
222 cgd = (struct ccb_getdev *)arg;
223 if (cgd == NULL)
224 break;
225
226#if 0
227 if (cgd->protocol != PROTO_SCSI)
228 break;
229#endif
230
231 /*
232 * Allocate a peripheral instance for this device and
233 * start the probe process.
234 */
235 status = cam_periph_alloc(sgregister, sgoninvalidate,
236 sgcleanup, sgstart,
237 "sg", CAM_PERIPH_BIO, cgd->ccb_h.path,
238 sgasync, AC_FOUND_DEVICE, cgd);
239 if ((status != CAM_REQ_CMP) && (status != CAM_REQ_INPROG)) {
240 const struct cam_status_entry *entry;
241
242 entry = cam_fetch_status_entry(status);
243 kprintf("sgasync: Unable to attach new device "
244 "due to status %#x: %s\n", status, entry ?
245 entry->status_text : "Unknown");
246 }
247 break;
248 }
249 default:
250 cam_periph_async(periph, code, path, arg);
251 break;
252 }
253}
254
255static cam_status
256sgregister(struct cam_periph *periph, void *arg)
257{
258 struct sg_softc *softc;
259 struct ccb_getdev *cgd;
260 int no_tags;
261
262 cgd = (struct ccb_getdev *)arg;
263 if (periph == NULL) {
264 kprintf("sgregister: periph was NULL!!\n");
265 return (CAM_REQ_CMP_ERR);
266 }
267
268 if (cgd == NULL) {
269 kprintf("sgregister: no getdev CCB, can't register device\n");
270 return (CAM_REQ_CMP_ERR);
271 }
272
273 softc = kmalloc(sizeof(*softc), M_DEVBUF, M_WAITOK | M_ZERO);
388705e4
MD		 274 softc->state = SG_STATE_NORMAL;
275 softc->pd_type = SID_TYPE(&cgd->inq_data);
276 softc->sg_timeout = SG_DEFAULT_TIMEOUT / SG_DEFAULT_HZ * hz;
277 softc->sg_user_timeout = SG_DEFAULT_TIMEOUT;
278 TAILQ_INIT(&softc->rdwr_done);
279 periph->softc = softc;
280
281 /*
282 * We pass in 0 for all blocksize, since we don't know what the
283 * blocksize of the device is, if it even has a blocksize.
284 */
285 cam_periph_unlock(periph);
286 no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0;
287 devstat_add_entry(&softc->device_stats, "sg",
288 periph->unit_number, 0,
289 DEVSTAT_NO_BLOCKSIZE |
290 (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0),
291 softc->pd_type |
292 DEVSTAT_TYPE_IF_SCSI | DEVSTAT_PRIORITY_PASS,
293 DEVSTAT_PRIORITY_PASS);
294
295 /* Register the device */
296 softc->dev = make_dev(&sg_ops, periph->unit_number,
297 UID_ROOT, GID_OPERATOR, 0600, "%s%d",
298 periph->periph_name, periph->unit_number);
299 make_dev_alias(softc->dev, "sg%c", 'a' + periph->unit_number);
300 cam_periph_lock(periph);
301 softc->dev->si_drv1 = periph;
302
303 /*
304 * Add as async callback so that we get
305 * notified if this device goes away.
306 */
307 xpt_register_async(AC_LOST_DEVICE, sgasync, periph, periph->path);
308
309 if (bootverbose)
310 xpt_announce_periph(periph, NULL);
311
312 return (CAM_REQ_CMP);
313}
314
315static void
316sgstart(struct cam_periph *periph, union ccb *start_ccb)
317{
318 struct sg_softc *softc;
319
320 softc = (struct sg_softc *)periph->softc;
321
322 switch (softc->state) {
323 case SG_STATE_NORMAL:
324 start_ccb->ccb_h.ccb_type = SG_CCB_WAITING;
325 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
326 periph_links.sle);
327 periph->immediate_priority = CAM_PRIORITY_NONE;
328 wakeup(&periph->ccb_list);
329 break;
330 }
331}
332
333static void
334sgdone(struct cam_periph *periph, union ccb *done_ccb)
335{
336 struct sg_softc *softc;
337 struct ccb_scsiio *csio;
338
339 softc = (struct sg_softc *)periph->softc;
340 csio = &done_ccb->csio;
341 switch (csio->ccb_h.ccb_type) {
342 case SG_CCB_WAITING:
343 /* Caller will release the CCB */
344 wakeup(&done_ccb->ccb_h.cbfcnp);
345 return;
346 case SG_CCB_RDWR_IO:
347 {
348 struct sg_rdwr *rdwr;
349 int state;
350
351 devstat_end_transaction(
352 &softc->device_stats,
353 csio->dxfer_len,
354 csio->tag_action & 0xf,
355 ((csio->ccb_h.flags & CAM_DIR_MASK) ==
356 CAM_DIR_NONE) ? DEVSTAT_NO_DATA :
357 ((csio->ccb_h.flags & CAM_DIR_OUT) ?
358 DEVSTAT_WRITE : DEVSTAT_READ));
359
360 rdwr = done_ccb->ccb_h.ccb_rdwr;
361 state = rdwr->state;
362 rdwr->state = SG_RDWR_DONE;
363 wakeup(rdwr);
364 break;
365 }
366 default:
367 panic("unknown sg CCB type");
368 }
369}
370
371static int
372sgopen(struct dev_open_args *ap)
373/*cdev_t dev, int flags, int fmt, struct thread *td)*/
374{
375 struct cam_periph *periph;
376 struct sg_softc *softc;
377 int error = 0;
378
379 periph = (struct cam_periph *)ap->a_head.a_dev->si_drv1;
380 if (periph == NULL)
381 return (ENXIO);
382
383 /*
384 * Don't allow access when we're running at a high securelevel.
385 */
386 if (securelevel > 1) {
387 cam_periph_unlock(periph);
388 cam_periph_release(periph);
389 return(EPERM);
390 }
391 cam_periph_lock(periph);
392
393 softc = (struct sg_softc *)periph->softc;
394 if (softc->flags & SG_FLAG_INVALID) {
395 cam_periph_unlock(periph);
396 return (ENXIO);
397 }
398
399 if ((softc->flags & SG_FLAG_OPEN) == 0) {
400 softc->flags |= SG_FLAG_OPEN;
401 cam_periph_unlock(periph);
402 } else {
403 /* Device closes aren't symmetrical, fix up the refcount. */
404 cam_periph_unlock(periph);
405 cam_periph_release(periph);
406 }
407
408 return (error);
409}
410
411static int
412sgclose(struct dev_close_args *ap)
413/* cdev_t dev, int flag, int fmt, struct thread *td) */
414{
415 struct cam_periph *periph;
416 struct sg_softc *softc;
417
418 periph = (struct cam_periph *)ap->a_head.a_dev->si_drv1;
419 if (periph == NULL)
420 return (ENXIO);
421
422 cam_periph_lock(periph);
423
424 softc = (struct sg_softc *)periph->softc;
425 softc->flags &= ~SG_FLAG_OPEN;
426
427 cam_periph_unlock(periph);
428 cam_periph_release(periph);
429
430 return (0);
431}
432
433static int
434sgioctl(struct dev_ioctl_args *ap)
435/* cdev_t dev, u_long cmd, caddr_t arg, int flag, struct thread *td) */
436{
437 union ccb *ccb;
438 struct ccb_scsiio *csio;
439 struct cam_periph *periph;
440 struct sg_softc *softc;
441 struct sg_io_hdr req;
442 int dir, error;
443
444 periph = (struct cam_periph *)ap->a_head.a_dev->si_drv1;
445 if (periph == NULL)
446 return (ENXIO);
447
448 cam_periph_lock(periph);
449
450 softc = (struct sg_softc *)periph->softc;
451 error = 0;
452
453 switch (ap->a_cmd) {
454 case LINUX_SCSI_GET_BUS_NUMBER: {
455 int busno;
456
457 busno = xpt_path_path_id(periph->path);
458 error = copyout(&busno, ap->a_data, sizeof(busno));
459 break;
460 }
461 case LINUX_SCSI_GET_IDLUN: {
462 struct scsi_idlun idlun;
463 struct cam_sim *sim;
464
465 idlun.dev_id = xpt_path_target_id(periph->path);
466 sim = xpt_path_sim(periph->path);
467 idlun.host_unique_id = sim->unit_number;
468 error = copyout(&idlun, ap->a_data, sizeof(idlun));
469 break;
470 }
471 case SG_GET_VERSION_NUM:
472 case LINUX_SG_GET_VERSION_NUM:
473 error = copyout(&sg_version, ap->a_data, sizeof(sg_version));
474 break;
475 case SG_SET_TIMEOUT:
476 case LINUX_SG_SET_TIMEOUT: {
477 u_int user_timeout;
478
479 error = copyin(ap->a_data, &user_timeout, sizeof(u_int));
480 if (error == 0) {
481 softc->sg_user_timeout = user_timeout;
482 softc->sg_timeout = user_timeout / SG_DEFAULT_HZ * hz;
483 }
484 break;
485 }
486 case SG_GET_TIMEOUT:
487 case LINUX_SG_GET_TIMEOUT:
488 /*
489 * The value is returned directly to the syscall.
490 */
491 ap->a_sysmsg->sm_result.iresult = softc->sg_user_timeout;
492 error = 0;
493 break;
494 case SG_IO:
495 case LINUX_SG_IO:
496 error = copyin(ap->a_data, &req, sizeof(req));
497 if (error)
498 break;
499
500 if (req.cmd_len > IOCDBLEN) {
501 error = EINVAL;
502 break;
503 }
504
505 if (req.iovec_count != 0) {
506 error = EOPNOTSUPP;
507 break;
508 }
509
510 ccb = cam_periph_getccb(periph, /*priority*/5);
511 csio = &ccb->csio;
512
513 error = copyin(req.cmdp, &csio->cdb_io.cdb_bytes,
514 req.cmd_len);
515 if (error) {
516 xpt_release_ccb(ccb);
517 break;
518 }
519
520 switch(req.dxfer_direction) {
521 case SG_DXFER_TO_DEV:
522 dir = CAM_DIR_OUT;
523 break;
524 case SG_DXFER_FROM_DEV:
525 dir = CAM_DIR_IN;
526 break;
527 case SG_DXFER_TO_FROM_DEV:
528 dir = CAM_DIR_IN | CAM_DIR_OUT;
529 break;
530 case SG_DXFER_NONE:
531 default:
532 dir = CAM_DIR_NONE;
533 break;
534 }
535
536 cam_fill_csio(csio,
537 /*retries*/1,
538 sgdone,
539 dir|CAM_DEV_QFRZDIS,
540 MSG_SIMPLE_Q_TAG,
541 req.dxferp,
542 req.dxfer_len,
543 req.mx_sb_len,
544 req.cmd_len,
545 req.timeout);
546
547 error = sgsendccb(periph, ccb);
548 if (error) {
549 req.host_status = DID_ERROR;
550 req.driver_status = DRIVER_INVALID;
551 xpt_release_ccb(ccb);
552 break;
553 }
554
555 req.status = csio->scsi_status;
556 req.masked_status = (csio->scsi_status >> 1) & 0x7f;
557 sg_scsiio_status(csio, &req.host_status, &req.driver_status);
558 req.resid = csio->resid;
559 req.duration = csio->ccb_h.timeout;
560 req.info = 0;
561
562 error = copyout(&req, ap->a_data, sizeof(req));
563 if ((error == 0) && (csio->ccb_h.status & CAM_AUTOSNS_VALID)
564 && (req.sbp != NULL)) {
565 req.sb_len_wr = req.mx_sb_len - csio->sense_resid;
566 error = copyout(&csio->sense_data, req.sbp,
567 req.sb_len_wr);
568 }
569
570 xpt_release_ccb(ccb);
571 break;
572
573 case SG_GET_RESERVED_SIZE:
574 case LINUX_SG_GET_RESERVED_SIZE: {
575 int size = 32768;
576
577 error = copyout(&size, ap->a_data, sizeof(size));
578 break;
579 }
580
581 case SG_GET_SCSI_ID:
582 case LINUX_SG_GET_SCSI_ID:
583 {
584 struct sg_scsi_id id;
585
586 id.host_no = 0; /* XXX */
587 id.channel = xpt_path_path_id(periph->path);
588 id.scsi_id = xpt_path_target_id(periph->path);
589 id.lun = xpt_path_lun_id(periph->path);
590 id.scsi_type = softc->pd_type;
591 id.h_cmd_per_lun = 1;
592 id.d_queue_depth = 1;
593 id.unused[0] = 0;
594 id.unused[1] = 0;
595
596 error = copyout(&id, ap->a_data, sizeof(id));
597 break;
598 }
599
600 case SG_EMULATED_HOST:
601 case SG_SET_TRANSFORM:
602 case SG_GET_TRANSFORM:
603 case SG_GET_NUM_WAITING:
604 case SG_SCSI_RESET:
605 case SG_GET_REQUEST_TABLE:
606 case SG_SET_KEEP_ORPHAN:
607 case SG_GET_KEEP_ORPHAN:
608 case SG_GET_ACCESS_COUNT:
609 case SG_SET_FORCE_LOW_DMA:
610 case SG_GET_LOW_DMA:
611 case SG_GET_SG_TABLESIZE:
612 case SG_SET_FORCE_PACK_ID:
613 case SG_GET_PACK_ID:
614 case SG_SET_RESERVED_SIZE:
615 case SG_GET_COMMAND_Q:
616 case SG_SET_COMMAND_Q:
617 case SG_SET_DEBUG:
618 case SG_NEXT_CMD_LEN:
619 case LINUX_SG_EMULATED_HOST:
620 case LINUX_SG_SET_TRANSFORM:
621 case LINUX_SG_GET_TRANSFORM:
622 case LINUX_SG_GET_NUM_WAITING:
623 case LINUX_SG_SCSI_RESET:
624 case LINUX_SG_GET_REQUEST_TABLE:
625 case LINUX_SG_SET_KEEP_ORPHAN:
626 case LINUX_SG_GET_KEEP_ORPHAN:
627 case LINUX_SG_GET_ACCESS_COUNT:
628 case LINUX_SG_SET_FORCE_LOW_DMA:
629 case LINUX_SG_GET_LOW_DMA:
630 case LINUX_SG_GET_SG_TABLESIZE:
631 case LINUX_SG_SET_FORCE_PACK_ID:
632 case LINUX_SG_GET_PACK_ID:
633 case LINUX_SG_SET_RESERVED_SIZE:
634 case LINUX_SG_GET_COMMAND_Q:
635 case LINUX_SG_SET_COMMAND_Q:
636 case LINUX_SG_SET_DEBUG:
637 case LINUX_SG_NEXT_CMD_LEN:
638 default:
639#ifdef CAMDEBUG
fc58f882 640 kprintf("sgioctl: rejecting cmd 0x%lx\n", ap->a_cmd);
388705e4
MD		 641#endif
642 error = ENODEV;
643 break;
644 }
645
646 cam_periph_unlock(periph);
647 return (error);
648}
649
650static int
651sgwrite(struct dev_write_args *ap)
652/*cdev_t dev, struct uio *uio, int ioflag)*/
653{
654 union ccb *ccb;
655 struct cam_periph *periph;
656 struct ccb_scsiio *csio;
657 struct sg_softc *sc;
658 struct sg_header *hdr;
659 struct sg_rdwr *rdwr;
660 u_char cdb_cmd;
661 char *buf;
662 int error = 0, cdb_len, buf_len, dir;
663 struct uio *uio = ap->a_uio;
664
665 periph = ap->a_head.a_dev->si_drv1;
666 rdwr = kmalloc(sizeof(*rdwr), M_DEVBUF, M_WAITOK | M_ZERO);
667 hdr = &rdwr->hdr.hdr;
668
669 /* Copy in the header block and sanity check it */
670 if (uio->uio_resid < sizeof(*hdr)) {
671 error = EINVAL;
672 goto out_hdr;
673 }
674 error = uiomove((char *)hdr, sizeof(*hdr), uio);
675 if (error)
676 goto out_hdr;
677
678 ccb = xpt_alloc_ccb();
679 if (ccb == NULL) {
680 error = ENOMEM;
681 goto out_hdr;
682 }
683 csio = &ccb->csio;
684
685 /*
686 * Copy in the CDB block. The designers of the interface didn't
687 * bother to provide a size for this in the header, so we have to
688 * figure it out ourselves.
689 */
690 if (uio->uio_resid < 1)
691 goto out_ccb;
692 error = uiomove(&cdb_cmd, 1, uio);
693 if (error)
694 goto out_ccb;
695 if (hdr->twelve_byte)
696 cdb_len = 12;
697 else
698 cdb_len = scsi_group_len(cdb_cmd);
699 /*
700 * We've already read the first byte of the CDB and advanced the uio
701 * pointer. Just read the rest.
702 */
703 csio->cdb_io.cdb_bytes[0] = cdb_cmd;
704 error = uiomove(&csio->cdb_io.cdb_bytes[1], cdb_len - 1, uio);
705 if (error)
706 goto out_ccb;
707
708 /*
709 * Now set up the data block. Again, the designers didn't bother
710 * to make this reliable.
711 */
712 buf_len = uio->uio_resid;
713 if (buf_len != 0) {
714 buf = kmalloc(buf_len, M_DEVBUF, M_WAITOK | M_ZERO);
715 error = uiomove(buf, buf_len, uio);
716 if (error)
717 goto out_buf;
718 dir = CAM_DIR_OUT;
719 } else if (hdr->reply_len != 0) {
720 buf = kmalloc(hdr->reply_len, M_DEVBUF, M_WAITOK | M_ZERO);
721 buf_len = hdr->reply_len;
722 dir = CAM_DIR_IN;
723 } else {
724 buf = NULL;
725 buf_len = 0;
726 dir = CAM_DIR_NONE;
727 }
728
729 cam_periph_lock(periph);
730 sc = periph->softc;
731 xpt_setup_ccb(&ccb->ccb_h, periph->path, /*priority*/5);
732 cam_fill_csio(csio,
733 /*retries*/1,
734 sgdone,
735 dir|CAM_DEV_QFRZDIS,
736 MSG_SIMPLE_Q_TAG,
737 buf,
738 buf_len,
739 SG_MAX_SENSE,
740 cdb_len,
741 sc->sg_timeout);
742
743 /*
744 * Send off the command and hope that it works. This path does not
745 * go through sgstart because the I/O is supposed to be asynchronous.
746 */
747 rdwr->buf = buf;
748 rdwr->buf_len = buf_len;
749 rdwr->tag = hdr->pack_id;
750 rdwr->ccb = ccb;
751 rdwr->state = SG_RDWR_INPROG;
752 ccb->ccb_h.ccb_rdwr = rdwr;
753 ccb->ccb_h.ccb_type = SG_CCB_RDWR_IO;
754 TAILQ_INSERT_TAIL(&sc->rdwr_done, rdwr, rdwr_link);
755 error = sgsendrdwr(periph, ccb);
756 cam_periph_unlock(periph);
757 return (error);
758
759out_buf:
760 kfree(buf, M_DEVBUF);
761out_ccb:
762 xpt_free_ccb(ccb);
763out_hdr:
764 kfree(rdwr, M_DEVBUF);
765 return (error);
766}
767
768static int
769sgread(struct dev_read_args *ap)
770/*cdev_t dev, struct uio *uio, int ioflag)*/
771{
772 struct ccb_scsiio *csio;
773 struct cam_periph *periph;
774 struct sg_softc *sc;
775 struct sg_header *hdr;
776 struct sg_rdwr *rdwr;
777 u_short hstat, dstat;
778 int error, pack_len, reply_len, pack_id;
779 struct uio *uio = ap->a_uio;
780
781 periph = ap->a_head.a_dev->si_drv1;
782
783 /* XXX The pack len field needs to be updated and written out instead
784 * of discarded. Not sure how to do that.
785 */
786 uio->uio_rw = UIO_WRITE;
787 if ((error = uiomove((char *)&pack_len, 4, uio)) != 0)
788 return (error);
789 if ((error = uiomove((char *)&reply_len, 4, uio)) != 0)
790 return (error);
791 if ((error = uiomove((char *)&pack_id, 4, uio)) != 0)
792 return (error);
793 uio->uio_rw = UIO_READ;
794
795 cam_periph_lock(periph);
796 sc = periph->softc;
797search:
798 TAILQ_FOREACH(rdwr, &sc->rdwr_done, rdwr_link) {
799 if (rdwr->tag == pack_id)
800 break;
801 }
802 if (rdwr == NULL) {
803 cam_periph_unlock(periph);
804 if (tsleep(&hstat, PCATCH, "sgnull", 0) == ERESTART)
805 return(EAGAIN);
806 cam_periph_lock(periph);
807 goto search;
808 }
809 if (rdwr->state != SG_RDWR_DONE) {
810 tsleep_interlock(rdwr, PCATCH);
811 cam_periph_unlock(periph);
812 if (rdwr->state != SG_RDWR_DONE) {
813 if (tsleep(rdwr, PCATCH | PINTERLOCKED, "sgread", 0) ==
814 ERESTART) {
815 return (EAGAIN);
816 }
817 }
818 cam_periph_lock(periph);
819 goto search;
820 }
821 TAILQ_REMOVE(&sc->rdwr_done, rdwr, rdwr_link);
822 cam_periph_unlock(periph);
823
824 hdr = &rdwr->hdr.hdr;
825 csio = &rdwr->ccb->csio;
826 sg_scsiio_status(csio, &hstat, &dstat);
827 hdr->host_status = hstat;
828 hdr->driver_status = dstat;
829 hdr->target_status = csio->scsi_status >> 1;
830
831 switch (hstat) {
832 case DID_OK:
833 case DID_PASSTHROUGH:
834 case DID_SOFT_ERROR:
835 hdr->result = 0;
836 break;
837 case DID_NO_CONNECT:
838 case DID_BUS_BUSY:
839 case DID_TIME_OUT:
840 hdr->result = EBUSY;
841 break;
842 case DID_BAD_TARGET:
843 case DID_ABORT:
844 case DID_PARITY:
845 case DID_RESET:
846 case DID_BAD_INTR:
847 case DID_ERROR:
848 default:
849 hdr->result = EIO;
850 break;
851 }
852
853 if (dstat == DRIVER_SENSE) {
854 bcopy(&csio->sense_data, hdr->sense_buffer,
855 min(csio->sense_len, SG_MAX_SENSE));
856#ifdef CAMDEBUG
857 scsi_sense_print(csio);
858#endif
859 }
860
861 error = uiomove((char *)&hdr->result, sizeof(*hdr) -
862 offsetof(struct sg_header, result), uio);
863 if ((error == 0) && (hdr->result == 0))
864 error = uiomove(rdwr->buf, rdwr->buf_len, uio);
865
866 cam_periph_lock(periph);
867 xpt_free_ccb(rdwr->ccb);
868 cam_periph_unlock(periph);
869 kfree(rdwr->buf, M_DEVBUF);
870 kfree(rdwr, M_DEVBUF);
871 return (error);
872}
873
874static int
875sgsendccb(struct cam_periph *periph, union ccb *ccb)
876{
877 struct sg_softc *softc;
878 struct cam_periph_map_info mapinfo;
879 int error, need_unmap = 0;
880
881 softc = periph->softc;
882 if (((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)
883 && (ccb->csio.data_ptr != NULL)) {
884 bzero(&mapinfo, sizeof(mapinfo));
885
886 /*
887 * cam_periph_mapmem calls into proc and vm functions that can
888 * sleep as well as trigger I/O, so we can't hold the lock.
889 * Dropping it here is reasonably safe.
890 */
891 cam_periph_unlock(periph);
892 error = cam_periph_mapmem(ccb, &mapinfo);
893 cam_periph_lock(periph);
894 if (error)
895 return (error);
896 need_unmap = 1;
897 }
898
899 error = cam_periph_runccb(ccb, sgerror, CAM_RETRY_SELTO,
900 SF_RETRY_UA, &softc->device_stats);
901
902 if (need_unmap)
903 cam_periph_unmapmem(ccb, &mapinfo);
904
905 return (error);
906}
907
908static int
909sgsendrdwr(struct cam_periph *periph, union ccb *ccb)
910{
911 struct sg_softc *softc;
912
913 softc = periph->softc;
914 devstat_start_transaction(&softc->device_stats);
915 xpt_action(ccb);
916 return (0);
917}
918
919static int
920sgerror(union ccb *ccb, uint32_t cam_flags, uint32_t sense_flags)
921{
922 struct cam_periph *periph;
923 struct sg_softc *softc;
924
925 periph = xpt_path_periph(ccb->ccb_h.path);
926 softc = (struct sg_softc *)periph->softc;
927
928 return (cam_periph_error(ccb, cam_flags, sense_flags,
929 &softc->saved_ccb));
930}
931
932static void
933sg_scsiio_status(struct ccb_scsiio *csio, u_short *hoststat, u_short *drvstat)
934{
935 int status;
936
937 status = csio->ccb_h.status;
938
939 switch (status & CAM_STATUS_MASK) {
940 case CAM_REQ_CMP:
941 *hoststat = DID_OK;
942 *drvstat = 0;
943 break;
944 case CAM_REQ_CMP_ERR:
945 *hoststat = DID_ERROR;
946 *drvstat = 0;
947 break;
948 case CAM_REQ_ABORTED:
949 *hoststat = DID_ABORT;
950 *drvstat = 0;
951 break;
952 case CAM_REQ_INVALID:
953 *hoststat = DID_ERROR;
954 *drvstat = DRIVER_INVALID;
955 break;
956 case CAM_DEV_NOT_THERE:
957 *hoststat = DID_BAD_TARGET;
958 *drvstat = 0;
959 break;
960 case CAM_SEL_TIMEOUT:
961 *hoststat = DID_NO_CONNECT;
962 *drvstat = 0;
963 break;
964 case CAM_CMD_TIMEOUT:
965 *hoststat = DID_TIME_OUT;
966 *drvstat = 0;
967 break;
968 case CAM_SCSI_STATUS_ERROR:
969 *hoststat = DID_ERROR;
970 *drvstat = 0;
971 break;
972 case CAM_SCSI_BUS_RESET:
973 *hoststat = DID_RESET;
974 *drvstat = 0;
975 break;
976 case CAM_UNCOR_PARITY:
977 *hoststat = DID_PARITY;
978 *drvstat = 0;
979 break;
980 case CAM_SCSI_BUSY:
981 *hoststat = DID_BUS_BUSY;
982 *drvstat = 0;
983 break;
984 default:
985 *hoststat = DID_ERROR;
986 *drvstat = DRIVER_ERROR;
987 }
988
989 if (status & CAM_AUTOSNS_VALID)
990 *drvstat = DRIVER_SENSE;
991}
992
993static int
994scsi_group_len(u_char cmd)
995{
996 int len[] = {6, 10, 10, 12, 12, 12, 10, 10};
997 int group;
998
999 group = (cmd >> 5) & 0x7;
1000 return (len[group]);
1001}
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