AMD64 - Refactor uio_resid and size_t assumptions.
[dragonfly.git] / sys / bus / cam / scsi / scsi_target.c
CommitLineData
984263bc
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1/*
2 * Generic SCSI Target Kernel Mode Driver
3 *
4 * Copyright (c) 2002 Nate Lawson.
5 * Copyright (c) 1998, 1999, 2001, 2002 Justin T. Gibbs.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions, and the following disclaimer,
13 * without modification, immediately at the beginning of the file.
14 * 2. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: src/sys/cam/scsi/scsi_target.c,v 1.22.2.7 2003/02/18 22:07:10 njl Exp $
2d19cdd3 30 * $DragonFly: src/sys/bus/cam/scsi/scsi_target.c,v 1.20 2008/07/18 00:07:23 dillon Exp $
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MD
31 */
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/kernel.h>
36#include <sys/conf.h>
05726f07 37#include <sys/device.h>
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38#include <sys/malloc.h>
39#include <sys/poll.h>
40#include <sys/vnode.h>
41#include <sys/devicestat.h>
4e01b467 42#include <sys/thread2.h>
2c1e28dd 43#include <sys/devfs.h>
984263bc 44
1f2de5d4
MD
45#include "../cam.h"
46#include "../cam_ccb.h"
47#include "../cam_periph.h"
48#include "../cam_xpt_periph.h"
1c8b7a9a 49#include "../cam_sim.h"
1f2de5d4 50#include "scsi_targetio.h"
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MD
51
52/* Transaction information attached to each CCB sent by the user */
53struct targ_cmd_descr {
54 struct cam_periph_map_info mapinfo;
55 TAILQ_ENTRY(targ_cmd_descr) tqe;
56 union ccb *user_ccb;
57 int priority;
58 int func_code;
59};
60
61/* Offset into the private CCB area for storing our descriptor */
62#define targ_descr periph_priv.entries[1].ptr
63
64TAILQ_HEAD(descr_queue, targ_cmd_descr);
65
66typedef enum {
67 TARG_STATE_RESV = 0x00, /* Invalid state */
68 TARG_STATE_OPENED = 0x01, /* Device opened, softc initialized */
69 TARG_STATE_LUN_ENABLED = 0x02 /* Device enabled for a path */
70} targ_state;
71
72/* Per-instance device software context */
73struct targ_softc {
74 /* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */
75 struct ccb_queue pending_ccb_queue;
76
77 /* Command descriptors awaiting CTIO resources from the XPT */
78 struct descr_queue work_queue;
79
80 /* Command descriptors that have been aborted back to the user. */
81 struct descr_queue abort_queue;
82
83 /*
84 * Queue of CCBs that have been copied out to userland, but our
85 * userland daemon has not yet seen.
86 */
87 struct ccb_queue user_ccb_queue;
88
89 struct cam_periph *periph;
90 struct cam_path *path;
91 targ_state state;
92 struct selinfo read_select;
93 struct devstat device_stats;
94};
95
96static d_open_t targopen;
97static d_close_t targclose;
98static d_read_t targread;
99static d_write_t targwrite;
100static d_ioctl_t targioctl;
101static d_poll_t targpoll;
102static d_kqfilter_t targkqfilter;
8be7edad
MD
103static d_clone_t targclone;
104DEVFS_DECLARE_CLONE_BITMAP(targ);
105
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106static void targreadfiltdetach(struct knote *kn);
107static int targreadfilt(struct knote *kn, long hint);
108static struct filterops targread_filtops =
109 { 1, NULL, targreadfiltdetach, targreadfilt };
110
111#define TARG_CDEV_MAJOR 65
05726f07
PA
112static struct dev_ops targ_ops = {
113 { "targ", TARG_CDEV_MAJOR, D_KQFILTER },
114 .d_open = targopen,
115 .d_close = targclose,
116 .d_read = targread,
117 .d_write = targwrite,
118 .d_ioctl = targioctl,
119 .d_poll = targpoll,
120 .d_kqfilter = targkqfilter
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MD
121};
122
123static cam_status targendislun(struct cam_path *path, int enable,
124 int grp6_len, int grp7_len);
125static cam_status targenable(struct targ_softc *softc,
126 struct cam_path *path,
127 int grp6_len, int grp7_len);
128static cam_status targdisable(struct targ_softc *softc);
129static periph_ctor_t targctor;
130static periph_dtor_t targdtor;
131static periph_start_t targstart;
132static int targusermerge(struct targ_softc *softc,
133 struct targ_cmd_descr *descr,
134 union ccb *ccb);
135static int targsendccb(struct targ_softc *softc, union ccb *ccb,
136 struct targ_cmd_descr *descr);
137static void targdone(struct cam_periph *periph,
138 union ccb *done_ccb);
139static int targreturnccb(struct targ_softc *softc,
140 union ccb *ccb);
141static union ccb * targgetccb(struct targ_softc *softc, xpt_opcode type,
142 int priority);
143static void targfreeccb(struct targ_softc *softc, union ccb *ccb);
144static struct targ_cmd_descr *
145 targgetdescr(struct targ_softc *softc);
146static periph_init_t targinit;
147static void targasync(void *callback_arg, u_int32_t code,
148 struct cam_path *path, void *arg);
149static void abort_all_pending(struct targ_softc *softc);
150static void notify_user(struct targ_softc *softc);
151static int targcamstatus(cam_status status);
152static size_t targccblen(xpt_opcode func_code);
153
154static struct periph_driver targdriver =
155{
156 targinit, "targ",
157 TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0
158};
2ad14cb5 159PERIPHDRIVER_DECLARE(targ, targdriver);
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160
161static MALLOC_DEFINE(M_TARG, "TARG", "TARG data");
162
1c8b7a9a
PA
163/*
164 * Create softc and initialize it. Only one proc can open each targ device.
165 * There is no locking here because a periph doesn't get created until an
166 * ioctl is issued to do so, and that can't happen until this method returns.
167 */
984263bc 168static int
05726f07 169targopen(struct dev_open_args *ap)
984263bc 170{
05726f07 171 cdev_t dev = ap->a_head.a_dev;
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172 struct targ_softc *softc;
173
174 if (dev->si_drv1 != 0) {
175 return (EBUSY);
176 }
177
178 /* Mark device busy before any potentially blocking operations */
179 dev->si_drv1 = (void *)~0;
e4c9c0c8 180 reference_dev(dev); /* save ref for later destroy_dev() */
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181
182 /* Create the targ device, allocate its softc, initialize it */
8be7edad 183#if 0
05726f07 184 make_dev(&targ_ops, minor(dev), UID_ROOT, GID_WHEEL, 0600,
984263bc 185 "targ%d", lminor(dev));
8be7edad 186#endif
984263bc 187 MALLOC(softc, struct targ_softc *, sizeof(*softc), M_TARG,
ad86f6b6 188 M_INTWAIT | M_ZERO);
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189 dev->si_drv1 = softc;
190 softc->state = TARG_STATE_OPENED;
191 softc->periph = NULL;
192 softc->path = NULL;
193
194 TAILQ_INIT(&softc->pending_ccb_queue);
195 TAILQ_INIT(&softc->work_queue);
196 TAILQ_INIT(&softc->abort_queue);
197 TAILQ_INIT(&softc->user_ccb_queue);
198
199 return (0);
200}
201
202/* Disable LUN if enabled and teardown softc */
203static int
05726f07 204targclose(struct dev_close_args *ap)
984263bc 205{
05726f07 206 cdev_t dev = ap->a_head.a_dev;
984263bc 207 struct targ_softc *softc;
1c8b7a9a 208 struct cam_periph *periph;
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209 int error;
210
211 softc = (struct targ_softc *)dev->si_drv1;
1c8b7a9a
PA
212 if ((softc->periph == NULL) ||
213 (softc->state & TARG_STATE_LUN_ENABLED) == 0) {
8be7edad 214 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(targ), dev->si_uminor);
1c8b7a9a
PA
215 destroy_dev(dev);
216 FREE(softc, M_TARG);
217 return (0);
218 }
219
220 /*
221 * Acquire a hold on the periph so that it doesn't go away before
222 * we are ready at the end of the function.
223 */
224 periph = softc->periph;
225 cam_periph_acquire(periph);
226 cam_periph_lock(periph);
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227 error = targdisable(softc);
228 if (error == CAM_REQ_CMP) {
229 dev->si_drv1 = 0;
230 if (softc->periph != NULL) {
231 cam_periph_invalidate(softc->periph);
232 softc->periph = NULL;
233 }
e4c9c0c8 234 destroy_dev(dev); /* eats the open ref */
8be7edad 235 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(targ), dev->si_uminor);
984263bc 236 FREE(softc, M_TARG);
e4c9c0c8
MD
237 } else {
238 release_dev(dev);
984263bc 239 }
1c8b7a9a
PA
240 cam_periph_unlock(periph);
241 cam_periph_release(periph);
242
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MD
243 return (error);
244}
245
246/* Enable/disable LUNs, set debugging level */
247static int
05726f07 248targioctl(struct dev_ioctl_args *ap)
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249{
250 struct targ_softc *softc;
251 cam_status status;
252
05726f07 253 softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
984263bc 254
05726f07 255 switch (ap->a_cmd) {
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MD
256 case TARGIOCENABLE:
257 {
258 struct ioc_enable_lun *new_lun;
259 struct cam_path *path;
1c8b7a9a 260 struct cam_sim *sim;
984263bc 261
05726f07 262 new_lun = (struct ioc_enable_lun *)ap->a_data;
1c8b7a9a
PA
263 status = xpt_create_path_unlocked(&path, /*periph*/NULL,
264 new_lun->path_id,
265 new_lun->target_id,
266 new_lun->lun_id);
984263bc 267 if (status != CAM_REQ_CMP) {
85f8e2ea 268 kprintf("Couldn't create path, status %#x\n", status);
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MD
269 break;
270 }
1c8b7a9a
PA
271 sim = xpt_path_sim(path);
272 CAM_SIM_LOCK(sim);
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MD
273 status = targenable(softc, path, new_lun->grp6_len,
274 new_lun->grp7_len);
275 xpt_free_path(path);
1c8b7a9a 276 CAM_SIM_UNLOCK(sim);
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MD
277 break;
278 }
279 case TARGIOCDISABLE:
1c8b7a9a
PA
280 if (softc->periph == NULL) {
281 status = CAM_DEV_NOT_THERE;
282 break;
283 }
284 cam_periph_lock(softc->periph);
984263bc 285 status = targdisable(softc);
1c8b7a9a 286 cam_periph_unlock(softc->periph);
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MD
287 break;
288 case TARGIOCDEBUG:
289 {
290#ifdef CAMDEBUG
291 struct ccb_debug cdbg;
292
1c8b7a9a
PA
293 /* If no periph available, disallow debugging changes */
294 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
295 status = CAM_DEV_NOT_THERE;
296 break;
297 }
984263bc 298 bzero(&cdbg, sizeof cdbg);
5ddcc6ea 299 if (*((int *)ap->a_data) != 0)
984263bc
MD
300 cdbg.flags = CAM_DEBUG_PERIPH;
301 else
302 cdbg.flags = CAM_DEBUG_NONE;
1c8b7a9a 303 cam_periph_lock(softc->periph);
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MD
304 xpt_setup_ccb(&cdbg.ccb_h, softc->path, /*priority*/0);
305 cdbg.ccb_h.func_code = XPT_DEBUG;
306 cdbg.ccb_h.cbfcnp = targdone;
307
984263bc 308 xpt_action((union ccb *)&cdbg);
1c8b7a9a 309 cam_periph_unlock(softc->periph);
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MD
310 status = cdbg.ccb_h.status & CAM_STATUS_MASK;
311#else
312 status = CAM_FUNC_NOTAVAIL;
313#endif
314 break;
315 }
316 default:
317 status = CAM_PROVIDE_FAIL;
318 break;
319 }
320
321 return (targcamstatus(status));
322}
323
324/* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
325static int
fef8985e 326targpoll(struct dev_poll_args *ap)
984263bc
MD
327{
328 struct targ_softc *softc;
4e01b467 329 int revents;
984263bc 330
05726f07 331 softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
984263bc
MD
332
333 /* Poll for write() is always ok. */
fef8985e
MD
334 revents = ap->a_events & (POLLOUT | POLLWRNORM);
335 if ((ap->a_events & (POLLIN | POLLRDNORM)) != 0) {
984263bc 336 /* Poll for read() depends on user and abort queues. */
1c8b7a9a 337 cam_periph_lock(softc->periph);
984263bc
MD
338 if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
339 !TAILQ_EMPTY(&softc->abort_queue)) {
fef8985e 340 revents |= ap->a_events & (POLLIN | POLLRDNORM);
984263bc 341 }
1c8b7a9a 342 cam_periph_unlock(softc->periph);
984263bc
MD
343 /* Only sleep if the user didn't poll for write. */
344 if (revents == 0)
05726f07 345 selrecord(curthread, &softc->read_select);
984263bc 346 }
fef8985e
MD
347 ap->a_events = revents;
348 return (0);
984263bc
MD
349}
350
351static int
05726f07 352targkqfilter(struct dev_kqfilter_args *ap)
984263bc 353{
05726f07 354 struct knote *kn = ap->a_kn;
984263bc 355 struct targ_softc *softc;
984263bc 356
05726f07 357 softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
984263bc
MD
358 kn->kn_hook = (caddr_t)softc;
359 kn->kn_fop = &targread_filtops;
4e01b467 360 crit_enter();
984263bc 361 SLIST_INSERT_HEAD(&softc->read_select.si_note, kn, kn_selnext);
4e01b467 362 crit_exit();
984263bc
MD
363 return (0);
364}
365
366static void
367targreadfiltdetach(struct knote *kn)
368{
369 struct targ_softc *softc;
984263bc
MD
370
371 softc = (struct targ_softc *)kn->kn_hook;
4e01b467 372 crit_enter();
984263bc 373 SLIST_REMOVE(&softc->read_select.si_note, kn, knote, kn_selnext);
4e01b467 374 crit_exit();
984263bc
MD
375}
376
377/* Notify the user's kqueue when the user queue or abort queue gets a CCB */
378static int
379targreadfilt(struct knote *kn, long hint)
380{
381 struct targ_softc *softc;
4e01b467 382 int retval;
984263bc
MD
383
384 softc = (struct targ_softc *)kn->kn_hook;
2d19cdd3 385 cam_periph_lock(softc->periph);
984263bc
MD
386 retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
387 !TAILQ_EMPTY(&softc->abort_queue);
1c8b7a9a 388 cam_periph_unlock(softc->periph);
984263bc
MD
389 return (retval);
390}
391
392/* Send the HBA the enable/disable message */
393static cam_status
394targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
395{
396 struct ccb_en_lun en_ccb;
397 cam_status status;
398
399 /* Tell the lun to begin answering selects */
400 xpt_setup_ccb(&en_ccb.ccb_h, path, /*priority*/1);
401 en_ccb.ccb_h.func_code = XPT_EN_LUN;
402 /* Don't need support for any vendor specific commands */
403 en_ccb.grp6_len = grp6_len;
404 en_ccb.grp7_len = grp7_len;
405 en_ccb.enable = enable ? 1 : 0;
406 xpt_action((union ccb *)&en_ccb);
407 status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
408 if (status != CAM_REQ_CMP) {
1c8b7a9a
PA
409 xpt_print(path, "%sable lun CCB rejected, status %#x\n",
410 enable ? "en" : "dis", status);
984263bc
MD
411 }
412 return (status);
413}
414
415/* Enable target mode on a LUN, given its path */
416static cam_status
417targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
418 int grp7_len)
419{
420 struct cam_periph *periph;
421 struct ccb_pathinq cpi;
422 cam_status status;
423
424 if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
425 return (CAM_LUN_ALRDY_ENA);
426
427 /* Make sure SIM supports target mode */
428 xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
429 cpi.ccb_h.func_code = XPT_PATH_INQ;
430 xpt_action((union ccb *)&cpi);
431 status = cpi.ccb_h.status & CAM_STATUS_MASK;
432 if (status != CAM_REQ_CMP) {
85f8e2ea 433 kprintf("pathinq failed, status %#x\n", status);
984263bc
MD
434 goto enable_fail;
435 }
436 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
85f8e2ea 437 kprintf("controller does not support target mode\n");
984263bc
MD
438 status = CAM_FUNC_NOTAVAIL;
439 goto enable_fail;
440 }
441
442 /* Destroy any periph on our path if it is disabled */
443 periph = cam_periph_find(path, "targ");
444 if (periph != NULL) {
445 struct targ_softc *del_softc;
446
447 del_softc = (struct targ_softc *)periph->softc;
448 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
449 cam_periph_invalidate(del_softc->periph);
450 del_softc->periph = NULL;
451 } else {
85f8e2ea 452 kprintf("Requested path still in use by targ%d\n",
984263bc
MD
453 periph->unit_number);
454 status = CAM_LUN_ALRDY_ENA;
455 goto enable_fail;
456 }
457 }
458
459 /* Create a periph instance attached to this path */
460 status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
461 "targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
462 if (status != CAM_REQ_CMP) {
85f8e2ea 463 kprintf("cam_periph_alloc failed, status %#x\n", status);
984263bc
MD
464 goto enable_fail;
465 }
466
467 /* Ensure that the periph now exists. */
468 if (cam_periph_find(path, "targ") == NULL) {
469 panic("targenable: succeeded but no periph?");
470 /* NOTREACHED */
471 }
472
473 /* Send the enable lun message */
474 status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
475 if (status != CAM_REQ_CMP) {
85f8e2ea 476 kprintf("enable lun failed, status %#x\n", status);
984263bc
MD
477 goto enable_fail;
478 }
479 softc->state |= TARG_STATE_LUN_ENABLED;
480
481enable_fail:
482 return (status);
483}
484
485/* Disable this softc's target instance if enabled */
486static cam_status
487targdisable(struct targ_softc *softc)
488{
489 cam_status status;
984263bc
MD
490
491 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
492 return (CAM_REQ_CMP);
493
494 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
495
496 /* Abort any ccbs pending on the controller */
4e01b467 497 crit_enter();
984263bc 498 abort_all_pending(softc);
4e01b467 499 crit_exit();
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MD
500
501 /* Disable this lun */
502 status = targendislun(softc->path, /*enable*/0,
503 /*grp6_len*/0, /*grp7_len*/0);
504 if (status == CAM_REQ_CMP)
505 softc->state &= ~TARG_STATE_LUN_ENABLED;
506 else
85f8e2ea 507 kprintf("Disable lun failed, status %#x\n", status);
984263bc
MD
508
509 return (status);
510}
511
512/* Initialize a periph (called from cam_periph_alloc) */
513static cam_status
514targctor(struct cam_periph *periph, void *arg)
515{
516 struct targ_softc *softc;
517
518 /* Store pointer to softc for periph-driven routines */
519 softc = (struct targ_softc *)arg;
520 periph->softc = softc;
521 softc->periph = periph;
522 softc->path = periph->path;
523 return (CAM_REQ_CMP);
524}
525
526static void
527targdtor(struct cam_periph *periph)
528{
529 struct targ_softc *softc;
530 struct ccb_hdr *ccb_h;
531 struct targ_cmd_descr *descr;
532
533 softc = (struct targ_softc *)periph->softc;
534
535 /*
536 * targdisable() aborts CCBs back to the user and leaves them
537 * on user_ccb_queue and abort_queue in case the user is still
538 * interested in them. We free them now.
539 */
540 while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
541 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
542 targfreeccb(softc, (union ccb *)ccb_h);
543 }
544 while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
545 TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
546 FREE(descr, M_TARG);
547 }
548
549 softc->periph = NULL;
550 softc->path = NULL;
551 periph->softc = NULL;
552}
553
554/* Receive CCBs from user mode proc and send them to the HBA */
555static int
05726f07 556targwrite(struct dev_write_args *ap)
984263bc 557{
05726f07 558 struct uio *uio = ap->a_uio;
984263bc
MD
559 union ccb *user_ccb;
560 struct targ_softc *softc;
561 struct targ_cmd_descr *descr;
4e01b467 562 int write_len, error;
984263bc
MD
563 int func_code, priority;
564
05726f07 565 softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
984263bc
MD
566 write_len = error = 0;
567 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
e54488bb 568 ("write - uio_resid %ld\n", uio->uio_resid));
984263bc
MD
569 while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
570 union ccb *ccb;
984263bc
MD
571
572 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
573 if (error != 0) {
574 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
575 ("write - uiomove failed (%d)\n", error));
576 break;
577 }
578 priority = fuword(&user_ccb->ccb_h.pinfo.priority);
579 if (priority == -1) {
580 error = EINVAL;
581 break;
582 }
583 func_code = fuword(&user_ccb->ccb_h.func_code);
584 switch (func_code) {
585 case XPT_ACCEPT_TARGET_IO:
586 case XPT_IMMED_NOTIFY:
1c8b7a9a 587 cam_periph_lock(softc->periph);
984263bc
MD
588 ccb = targgetccb(softc, func_code, priority);
589 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
590 descr->user_ccb = user_ccb;
591 descr->func_code = func_code;
592 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
593 ("Sent ATIO/INOT (%p)\n", user_ccb));
594 xpt_action(ccb);
984263bc
MD
595 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
596 &ccb->ccb_h,
597 periph_links.tqe);
1c8b7a9a 598 cam_periph_unlock(softc->periph);
984263bc
MD
599 break;
600 default:
1c8b7a9a 601 cam_periph_lock(softc->periph);
984263bc
MD
602 if ((func_code & XPT_FC_QUEUED) != 0) {
603 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
604 ("Sending queued ccb %#x (%p)\n",
605 func_code, user_ccb));
606 descr = targgetdescr(softc);
607 descr->user_ccb = user_ccb;
608 descr->priority = priority;
609 descr->func_code = func_code;
4e01b467 610 crit_enter();
984263bc
MD
611 TAILQ_INSERT_TAIL(&softc->work_queue,
612 descr, tqe);
4e01b467 613 crit_exit();
984263bc
MD
614 xpt_schedule(softc->periph, priority);
615 } else {
616 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
617 ("Sending inline ccb %#x (%p)\n",
618 func_code, user_ccb));
619 ccb = targgetccb(softc, func_code, priority);
620 descr = (struct targ_cmd_descr *)
621 ccb->ccb_h.targ_descr;
622 descr->user_ccb = user_ccb;
623 descr->priority = priority;
624 descr->func_code = func_code;
625 if (targusermerge(softc, descr, ccb) != EFAULT)
626 targsendccb(softc, ccb, descr);
627 targreturnccb(softc, ccb);
628 }
1c8b7a9a 629 cam_periph_unlock(softc->periph);
984263bc
MD
630 break;
631 }
632 write_len += sizeof(user_ccb);
633 }
634
635 /*
636 * If we've successfully taken in some amount of
637 * data, return success for that data first. If
638 * an error is persistent, it will be reported
639 * on the next write.
640 */
641 if (error != 0 && write_len == 0)
642 return (error);
643 if (write_len == 0 && uio->uio_resid != 0)
644 return (ENOSPC);
645 return (0);
646}
647
648/* Process requests (descrs) via the periph-supplied CCBs */
649static void
650targstart(struct cam_periph *periph, union ccb *start_ccb)
651{
652 struct targ_softc *softc;
653 struct targ_cmd_descr *descr, *next_descr;
4e01b467 654 int error;
984263bc
MD
655
656 softc = (struct targ_softc *)periph->softc;
657 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
658
4e01b467 659 crit_enter();
984263bc
MD
660 descr = TAILQ_FIRST(&softc->work_queue);
661 if (descr == NULL) {
4e01b467 662 crit_exit();
984263bc
MD
663 xpt_release_ccb(start_ccb);
664 } else {
665 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
666 next_descr = TAILQ_FIRST(&softc->work_queue);
4e01b467 667 crit_exit();
984263bc
MD
668
669 /* Initiate a transaction using the descr and supplied CCB */
670 error = targusermerge(softc, descr, start_ccb);
671 if (error == 0)
672 error = targsendccb(softc, start_ccb, descr);
673 if (error != 0) {
1c8b7a9a
PA
674 xpt_print(periph->path,
675 "targsendccb failed, err %d\n", error);
984263bc
MD
676 xpt_release_ccb(start_ccb);
677 suword(&descr->user_ccb->ccb_h.status,
678 CAM_REQ_CMP_ERR);
4e01b467 679 crit_enter();
984263bc 680 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
4e01b467 681 crit_exit();
984263bc
MD
682 notify_user(softc);
683 }
684
685 /* If we have more work to do, stay scheduled */
686 if (next_descr != NULL)
687 xpt_schedule(periph, next_descr->priority);
688 }
689}
690
691static int
692targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
693 union ccb *ccb)
694{
695 struct ccb_hdr *u_ccbh, *k_ccbh;
696 size_t ccb_len;
697 int error;
698
699 u_ccbh = &descr->user_ccb->ccb_h;
700 k_ccbh = &ccb->ccb_h;
701
702 /*
703 * There are some fields in the CCB header that need to be
704 * preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
705 */
706 xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
707 k_ccbh->retry_count = fuword(&u_ccbh->retry_count);
708 k_ccbh->func_code = descr->func_code;
709 k_ccbh->flags = fuword(&u_ccbh->flags);
710 k_ccbh->timeout = fuword(&u_ccbh->timeout);
711 ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
712 error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
713 if (error != 0) {
714 k_ccbh->status = CAM_REQ_CMP_ERR;
715 return (error);
716 }
717
718 /* Translate usermode abort_ccb pointer to its kernel counterpart */
719 if (k_ccbh->func_code == XPT_ABORT) {
720 struct ccb_abort *cab;
721 struct ccb_hdr *ccb_h;
984263bc
MD
722
723 cab = (struct ccb_abort *)ccb;
4e01b467 724 crit_enter();
984263bc
MD
725 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
726 periph_links.tqe) {
727 struct targ_cmd_descr *ab_descr;
728
729 ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
730 if (ab_descr->user_ccb == cab->abort_ccb) {
731 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
732 ("Changing abort for %p to %p\n",
733 cab->abort_ccb, ccb_h));
734 cab->abort_ccb = (union ccb *)ccb_h;
735 break;
736 }
737 }
4e01b467 738 crit_exit();
984263bc
MD
739 /* CCB not found, set appropriate status */
740 if (ccb_h == NULL) {
741 k_ccbh->status = CAM_PATH_INVALID;
742 error = ESRCH;
743 }
744 }
745
746 return (error);
747}
748
749/* Build and send a kernel CCB formed from descr->user_ccb */
750static int
751targsendccb(struct targ_softc *softc, union ccb *ccb,
752 struct targ_cmd_descr *descr)
753{
754 struct cam_periph_map_info *mapinfo;
755 struct ccb_hdr *ccb_h;
756 int error;
757
758 ccb_h = &ccb->ccb_h;
759 mapinfo = &descr->mapinfo;
760 mapinfo->num_bufs_used = 0;
761
762 /*
763 * There's no way for the user to have a completion
764 * function, so we put our own completion function in here.
765 * We also stash in a reference to our descriptor so targreturnccb()
766 * can find our mapping info.
767 */
768 ccb_h->cbfcnp = targdone;
769 ccb_h->targ_descr = descr;
770
771 /*
772 * We only attempt to map the user memory into kernel space
773 * if they haven't passed in a physical memory pointer,
774 * and if there is actually an I/O operation to perform.
775 * Right now cam_periph_mapmem() only supports SCSI and device
776 * match CCBs. For the SCSI CCBs, we only pass the CCB in if
777 * there's actually data to map. cam_periph_mapmem() will do the
778 * right thing, even if there isn't data to map, but since CCBs
779 * without data are a reasonably common occurance (e.g. test unit
780 * ready), it will save a few cycles if we check for it here.
781 */
782 if (((ccb_h->flags & CAM_DATA_PHYS) == 0)
783 && (((ccb_h->func_code == XPT_CONT_TARGET_IO)
784 && ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE))
785 || (ccb_h->func_code == XPT_DEV_MATCH))) {
786
787 error = cam_periph_mapmem(ccb, mapinfo);
788
789 /*
790 * cam_periph_mapmem returned an error, we can't continue.
791 * Return the error to the user.
792 */
793 if (error) {
794 ccb_h->status = CAM_REQ_CMP_ERR;
795 mapinfo->num_bufs_used = 0;
796 return (error);
797 }
798 }
799
800 /*
801 * Once queued on the pending CCB list, this CCB will be protected
802 * by our error recovery handler.
803 */
804 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
805 if (XPT_FC_IS_QUEUED(ccb)) {
4e01b467 806 crit_enter();
984263bc
MD
807 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
808 periph_links.tqe);
4e01b467 809 crit_exit();
984263bc
MD
810 }
811 xpt_action(ccb);
812
813 return (0);
814}
815
4e01b467 816/* Completion routine for CCBs (called in a critical section) */
984263bc
MD
817static void
818targdone(struct cam_periph *periph, union ccb *done_ccb)
819{
820 struct targ_softc *softc;
821 cam_status status;
822
823 CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb));
824 softc = (struct targ_softc *)periph->softc;
825 TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h,
826 periph_links.tqe);
827 status = done_ccb->ccb_h.status & CAM_STATUS_MASK;
828
829 /* If we're no longer enabled, throw away CCB */
830 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
831 targfreeccb(softc, done_ccb);
832 return;
833 }
834 /* abort_all_pending() waits for pending queue to be empty */
835 if (TAILQ_EMPTY(&softc->pending_ccb_queue))
836 wakeup(&softc->pending_ccb_queue);
837
838 switch (done_ccb->ccb_h.func_code) {
839 /* All FC_*_QUEUED CCBs go back to userland */
840 case XPT_IMMED_NOTIFY:
841 case XPT_ACCEPT_TARGET_IO:
842 case XPT_CONT_TARGET_IO:
843 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h,
844 periph_links.tqe);
845 notify_user(softc);
846 break;
847 default:
848 panic("targdone: impossible xpt opcode %#x",
849 done_ccb->ccb_h.func_code);
850 /* NOTREACHED */
851 }
852}
853
854/* Return CCBs to the user from the user queue and abort queue */
855static int
05726f07 856targread(struct dev_read_args *ap)
984263bc 857{
05726f07 858 struct uio *uio = ap->a_uio;
984263bc
MD
859 struct descr_queue *abort_queue;
860 struct targ_cmd_descr *user_descr;
861 struct targ_softc *softc;
862 struct ccb_queue *user_queue;
863 struct ccb_hdr *ccb_h;
864 union ccb *user_ccb;
4e01b467 865 int read_len, error;
984263bc
MD
866
867 error = 0;
868 read_len = 0;
05726f07 869 softc = (struct targ_softc *)ap->a_head.a_dev->si_drv1;
984263bc
MD
870 user_queue = &softc->user_ccb_queue;
871 abort_queue = &softc->abort_queue;
872 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
873
874 /* If no data is available, wait or return immediately */
1c8b7a9a 875 cam_periph_lock(softc->periph);
984263bc
MD
876 ccb_h = TAILQ_FIRST(user_queue);
877 user_descr = TAILQ_FIRST(abort_queue);
878 while (ccb_h == NULL && user_descr == NULL) {
05726f07 879 if ((ap->a_ioflag & IO_NDELAY) == 0) {
1c8b7a9a
PA
880 error = sim_lock_sleep(user_queue, PCATCH, "targrd", 0,
881 softc->periph->sim->lock);
984263bc
MD
882 ccb_h = TAILQ_FIRST(user_queue);
883 user_descr = TAILQ_FIRST(abort_queue);
884 if (error != 0) {
885 if (error == ERESTART) {
886 continue;
887 } else {
984263bc
MD
888 goto read_fail;
889 }
890 }
891 } else {
1c8b7a9a 892 cam_periph_unlock(softc->periph);
984263bc
MD
893 return (EAGAIN);
894 }
895 }
896
897 /* Data is available so fill the user's buffer */
898 while (ccb_h != NULL) {
899 struct targ_cmd_descr *descr;
900
901 if (uio->uio_resid < sizeof(user_ccb))
902 break;
903 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
984263bc
MD
904 descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
905 user_ccb = descr->user_ccb;
906 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
907 ("targread ccb %p (%p)\n", ccb_h, user_ccb));
908 error = targreturnccb(softc, (union ccb *)ccb_h);
909 if (error != 0)
910 goto read_fail;
1c8b7a9a 911 cam_periph_unlock(softc->periph);
984263bc 912 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
1c8b7a9a 913 cam_periph_lock(softc->periph);
984263bc
MD
914 if (error != 0)
915 goto read_fail;
916 read_len += sizeof(user_ccb);
917
984263bc
MD
918 ccb_h = TAILQ_FIRST(user_queue);
919 }
920
921 /* Flush out any aborted descriptors */
922 while (user_descr != NULL) {
923 if (uio->uio_resid < sizeof(user_ccb))
924 break;
925 TAILQ_REMOVE(abort_queue, user_descr, tqe);
984263bc
MD
926 user_ccb = user_descr->user_ccb;
927 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
928 ("targread aborted descr %p (%p)\n",
929 user_descr, user_ccb));
930 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
1c8b7a9a 931 cam_periph_unlock(softc->periph);
984263bc 932 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
1c8b7a9a 933 cam_periph_lock(softc->periph);
984263bc
MD
934 if (error != 0)
935 goto read_fail;
936 read_len += sizeof(user_ccb);
937
984263bc
MD
938 user_descr = TAILQ_FIRST(abort_queue);
939 }
984263bc
MD
940
941 /*
942 * If we've successfully read some amount of data, don't report an
943 * error. If the error is persistent, it will be reported on the
944 * next read().
945 */
946 if (read_len == 0 && uio->uio_resid != 0)
947 error = ENOSPC;
948
949read_fail:
1c8b7a9a 950 cam_periph_unlock(softc->periph);
984263bc
MD
951 return (error);
952}
953
954/* Copy completed ccb back to the user */
955static int
956targreturnccb(struct targ_softc *softc, union ccb *ccb)
957{
958 struct targ_cmd_descr *descr;
959 struct ccb_hdr *u_ccbh;
960 size_t ccb_len;
961 int error;
962
963 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
964 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
965 u_ccbh = &descr->user_ccb->ccb_h;
966
967 /* Copy out the central portion of the ccb_hdr */
968 copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
969 offsetof(struct ccb_hdr, periph_priv) -
970 offsetof(struct ccb_hdr, retry_count));
971
972 /* Copy out the rest of the ccb (after the ccb_hdr) */
973 ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
974 if (descr->mapinfo.num_bufs_used != 0)
975 cam_periph_unmapmem(ccb, &descr->mapinfo);
976 error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
977 if (error != 0) {
1c8b7a9a
PA
978 xpt_print(softc->path,
979 "targreturnccb - CCB copyout failed (%d)\n", error);
984263bc
MD
980 }
981 /* Free CCB or send back to devq. */
982 targfreeccb(softc, ccb);
983
984 return (error);
985}
986
987static union ccb *
988targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
989{
990 union ccb *ccb;
991 int ccb_len;
992
993 ccb_len = targccblen(type);
898d961b 994 MALLOC(ccb, union ccb *, ccb_len, M_TARG, M_INTWAIT);
984263bc
MD
995 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
996
997 xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
998 ccb->ccb_h.func_code = type;
999 ccb->ccb_h.cbfcnp = targdone;
1000 ccb->ccb_h.targ_descr = targgetdescr(softc);
1001 return (ccb);
1002}
1003
1004static void
1005targfreeccb(struct targ_softc *softc, union ccb *ccb)
1006{
1007 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
1008 ccb->ccb_h.targ_descr));
1009 FREE(ccb->ccb_h.targ_descr, M_TARG);
1010
1011 switch (ccb->ccb_h.func_code) {
1012 case XPT_ACCEPT_TARGET_IO:
1013 case XPT_IMMED_NOTIFY:
1014 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
1015 FREE(ccb, M_TARG);
1016 break;
1017 default:
1018 /* Send back CCB if we got it from the periph */
1019 if (XPT_FC_IS_QUEUED(ccb)) {
1020 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1021 ("returning queued ccb %p\n", ccb));
1022 xpt_release_ccb(ccb);
1023 } else {
1024 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1025 ("freeing ccb %p\n", ccb));
1026 FREE(ccb, M_TARG);
1027 }
1028 break;
1029 }
1030}
1031
1032static struct targ_cmd_descr *
1033targgetdescr(struct targ_softc *softc)
1034{
1035 struct targ_cmd_descr *descr;
1036
898d961b
MD
1037 MALLOC(descr, struct targ_cmd_descr *, sizeof(*descr),
1038 M_TARG, M_INTWAIT);
984263bc
MD
1039 descr->mapinfo.num_bufs_used = 0;
1040 return (descr);
1041}
1042
8be7edad
MD
1043static int
1044targclone(struct dev_clone_args *ap)
1045{
1046 int unit;
1047
1048 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(targ), 0);
1049 ap->a_dev = make_only_dev(&targ_ops, unit, UID_ROOT, GID_WHEEL,
1050 0600, "targ%d", unit);
1051 return 0;
1052}
1053
984263bc
MD
1054static void
1055targinit(void)
1056{
b96f3782
AH
1057 make_autoclone_dev(&targ_ops, &DEVFS_CLONE_BITMAP(targ),
1058 targclone, UID_ROOT, GID_WHEEL, 0600, "targ");
8be7edad 1059 /* XXX: need uninit or so? */
984263bc
MD
1060}
1061
1062static void
1063targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
1064{
1065 /* All events are handled in usermode by INOTs */
1066 panic("targasync() called, should be an INOT instead");
1067}
1068
1069/* Cancel all pending requests and CCBs awaiting work. */
1070static void
1071abort_all_pending(struct targ_softc *softc)
1072{
1073 struct targ_cmd_descr *descr;
1074 struct ccb_abort cab;
1075 struct ccb_hdr *ccb_h;
1c8b7a9a 1076 struct cam_sim *sim;
984263bc
MD
1077
1078 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n"));
1079
1080 /* First abort the descriptors awaiting resources */
1081 while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) {
1082 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1083 ("Aborting descr from workq %p\n", descr));
1084 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
1085 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
1086 }
1087
1088 /*
1089 * Then abort all pending CCBs.
1090 * targdone() will return the aborted CCB via user_ccb_queue
1091 */
1092 xpt_setup_ccb(&cab.ccb_h, softc->path, /*priority*/0);
1093 cab.ccb_h.func_code = XPT_ABORT;
1094 cab.ccb_h.status = CAM_REQ_CMP_ERR;
1095 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) {
1096 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1097 ("Aborting pending CCB %p\n", ccb_h));
1098 cab.abort_ccb = (union ccb *)ccb_h;
1099 xpt_action((union ccb *)&cab);
1100 if (cab.ccb_h.status != CAM_REQ_CMP) {
1c8b7a9a
PA
1101 xpt_print(cab.ccb_h.path,
1102 "Unable to abort CCB, status %#x\n",
1103 cab.ccb_h.status);
984263bc
MD
1104 }
1105 }
1106
1107 /* If we aborted at least one pending CCB ok, wait for it. */
1108 if (cab.ccb_h.status == CAM_REQ_CMP) {
1c8b7a9a
PA
1109 sim = xpt_path_sim(softc->path);
1110 sim_lock_sleep(&softc->pending_ccb_queue, PCATCH, "tgabrt", 0,
1111 sim->lock);
984263bc
MD
1112 }
1113
1114 /* If we aborted anything from the work queue, wakeup user. */
1115 if (!TAILQ_EMPTY(&softc->user_ccb_queue)
1116 || !TAILQ_EMPTY(&softc->abort_queue))
1117 notify_user(softc);
1118}
1119
1120/* Notify the user that data is ready */
1121static void
1122notify_user(struct targ_softc *softc)
1123{
1124 /*
1125 * Notify users sleeping via poll(), kqueue(), and
1126 * blocking read().
1127 */
1128 selwakeup(&softc->read_select);
1129 KNOTE(&softc->read_select.si_note, 0);
1130 wakeup(&softc->user_ccb_queue);
1131}
1132
1133/* Convert CAM status to errno values */
1134static int
1135targcamstatus(cam_status status)
1136{
1137 switch (status & CAM_STATUS_MASK) {
1138 case CAM_REQ_CMP: /* CCB request completed without error */
1139 return (0);
1140 case CAM_REQ_INPROG: /* CCB request is in progress */
1141 return (EINPROGRESS);
1142 case CAM_REQ_CMP_ERR: /* CCB request completed with an error */
1143 return (EIO);
1144 case CAM_PROVIDE_FAIL: /* Unable to provide requested capability */
1145 return (ENOTTY);
1146 case CAM_FUNC_NOTAVAIL: /* The requested function is not available */
1147 return (ENOTSUP);
1148 case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */
1149 return (EADDRINUSE);
1150 case CAM_PATH_INVALID: /* Supplied Path ID is invalid */
1151 case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */
1152 return (ENOENT);
1153 case CAM_REQ_ABORTED: /* CCB request aborted by the host */
1154 return (ECANCELED);
1155 case CAM_CMD_TIMEOUT: /* Command timeout */
1156 return (ETIMEDOUT);
1157 case CAM_REQUEUE_REQ: /* Requeue to preserve transaction ordering */
1158 return (EAGAIN);
1159 case CAM_REQ_INVALID: /* CCB request was invalid */
1160 return (EINVAL);
1161 case CAM_RESRC_UNAVAIL: /* Resource Unavailable */
1162 return (ENOMEM);
1163 case CAM_BUSY: /* CAM subsytem is busy */
1164 case CAM_UA_ABORT: /* Unable to abort CCB request */
1165 return (EBUSY);
1166 default:
1167 return (ENXIO);
1168 }
1169}
1170
1171static size_t
1172targccblen(xpt_opcode func_code)
1173{
1174 int len;
1175
1176 /* Codes we expect to see as a target */
1177 switch (func_code) {
1178 case XPT_CONT_TARGET_IO:
1179 case XPT_SCSI_IO:
1180 len = sizeof(struct ccb_scsiio);
1181 break;
1182 case XPT_ACCEPT_TARGET_IO:
1183 len = sizeof(struct ccb_accept_tio);
1184 break;
1185 case XPT_IMMED_NOTIFY:
1186 len = sizeof(struct ccb_immed_notify);
1187 break;
1188 case XPT_REL_SIMQ:
1189 len = sizeof(struct ccb_relsim);
1190 break;
1191 case XPT_PATH_INQ:
1192 len = sizeof(struct ccb_pathinq);
1193 break;
1194 case XPT_DEBUG:
1195 len = sizeof(struct ccb_debug);
1196 break;
1197 case XPT_ABORT:
1198 len = sizeof(struct ccb_abort);
1199 break;
1200 case XPT_EN_LUN:
1201 len = sizeof(struct ccb_en_lun);
1202 break;
1203 default:
1204 len = sizeof(union ccb);
1205 break;
1206 }
1207
1208 return (len);
1209}