atapi-cam.c revision 101606 
1/*-
2 * Copyright (c) 2001,2002 Thomas Quinot <thomas@cuivre.fr.eu.org>
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. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. 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 ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/dev/ata/atapi-cam.c 101606 2002-08-09 20:54:06Z sos $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/bus.h>
34#include <sys/devicestat.h>
35#include <sys/kernel.h>
36#include <sys/malloc.h>
37#include <sys/ata.h>
38#include <machine/bus.h>
39
40#include <cam/cam.h>
41#include <cam/cam_ccb.h>
42#include <cam/cam_periph.h>
43#include <cam/cam_sim.h>
44#include <cam/cam_xpt_sim.h>
45#include <cam/cam_debug.h>
46#include <cam/scsi/scsi_all.h>
47
48#include <dev/ata/ata-all.h>
49#include <dev/ata/atapi-all.h>
50
51/* hardware command descriptor block */
52struct atapi_hcb {
53    struct atapi_xpt_softc *softc;
54    int			unit;
55    int			bus;
56    int			target;
57    int			lun;
58    union ccb		*ccb;
59    u_int8_t		cmd[CAM_MAX_CDBLEN];
60    int			lags;
61#define DOING_AUTOSENSE 1
62
63    char		*dxfer_alloc;
64    TAILQ_ENTRY(atapi_hcb) chain;
65};
66
67/* private data associated with an ATA bus */
68struct atapi_xpt_softc {
69    struct ata_channel	*ata_ch;
70    struct cam_path	*path;
71    struct cam_sim	*sim;
72    int			flags;
73#define BUS_REGISTERED		0x01
74#define RESOURCE_SHORTAGE	0x02
75
76    TAILQ_HEAD(,atapi_hcb) pending_hcbs;
77    LIST_ENTRY(atapi_xpt_softc) chain;
78};
79
80static LIST_HEAD(,atapi_xpt_softc) all_buses = LIST_HEAD_INITIALIZER(all_buses);
81
82/* CAM XPT methods */
83static void atapi_action(struct cam_sim *, union ccb *);
84static void atapi_action1(struct cam_sim *, union ccb *);
85static void atapi_poll(struct cam_sim *);
86static void atapi_async(void *, u_int32_t, struct cam_path *, void *);
87static void atapi_async1(void *, u_int32_t, struct cam_path *, void *);
88static int atapi_cb(struct atapi_request *);
89
90/* internal functions */
91static void setup_dev(struct atapi_xpt_softc *, struct ata_device *);
92static void setup_async_cb(struct atapi_xpt_softc *, uint32_t);
93static void cam_rescan_callback(struct cam_periph *, union ccb *);
94static void cam_rescan(struct cam_sim *);
95static void free_hcb_and_ccb_done(struct atapi_hcb *, u_int32_t);
96static struct atapi_hcb *allocate_hcb(struct atapi_xpt_softc *, int, int, union ccb *);
97static void free_hcb(struct atapi_hcb *hcb);
98static void free_softc(struct atapi_xpt_softc *scp);
99static struct ata_device *get_ata_device(struct atapi_xpt_softc *scp, int id);
100
101static MALLOC_DEFINE(M_ATACAM, "ATA CAM transport", "ATA driver CAM-XPT layer");
102
103void
104atapi_cam_attach_bus(struct ata_channel *ata_ch)
105{
106    struct atapi_xpt_softc *scp = NULL;
107    struct cam_devq *devq = NULL;
108    struct cam_sim *sim = NULL;
109    struct cam_path *path = NULL;
110    int unit;
111
112    LIST_FOREACH(scp, &all_buses, chain) {
113	if (scp->ata_ch == ata_ch)
114	    return;
115    }
116
117    if ((scp = malloc(sizeof(struct atapi_xpt_softc),
118		      M_ATACAM, M_NOWAIT | M_ZERO)) == NULL)
119	goto error;
120
121    scp->ata_ch = ata_ch;
122    TAILQ_INIT(&scp->pending_hcbs);
123    LIST_INSERT_HEAD(&all_buses, scp, chain);
124    unit = device_get_unit(ata_ch->dev);
125
126    if ((devq = cam_simq_alloc(16)) == NULL)
127	goto error;
128
129    if ((sim = cam_sim_alloc(atapi_action, atapi_poll, "ata",
130		 (void *)scp, unit, 1, 1, devq)) == NULL) {
131	cam_simq_free(devq);
132	goto error;
133    }
134    scp->sim = sim;
135
136    if (xpt_bus_register(sim, 0) != CAM_SUCCESS) {
137	goto error;
138    }
139    scp->flags |= BUS_REGISTERED;
140
141    if (xpt_create_path(&path, /*periph*/ NULL,
142		cam_sim_path(sim), CAM_TARGET_WILDCARD,
143		CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
144	goto error;
145    }
146    scp->path = path;
147
148#ifdef CAMDEBUG
149    xpt_print_path(path);
150    printf("Registered SIM for ata%d\n", unit);
151#endif
152
153    setup_async_cb(scp, AC_LOST_DEVICE);
154
155    if (ata_ch->devices & ATA_ATAPI_MASTER)
156	setup_dev(scp, &ata_ch->device[MASTER]);
157    if (ata_ch->devices & ATA_ATAPI_SLAVE)
158	setup_dev(scp, &ata_ch->device[SLAVE]);
159
160    cam_rescan(sim);
161    return;
162
163error:
164    free_softc(scp);
165}
166
167void
168atapi_cam_detach_bus(struct ata_channel *ata_ch)
169{
170    struct atapi_xpt_softc *scp;
171
172    LIST_FOREACH(scp, &all_buses, chain) {
173	if (scp->ata_ch == ata_ch)
174	    free_softc(scp);
175    }
176}
177
178static void
179setup_dev(struct atapi_xpt_softc *scp, struct ata_device *atp)
180{
181    if (atp->driver == NULL) {
182	ata_set_name(atp, "atapicam",
183		     2 * device_get_unit(atp->channel->dev) +
184		     (atp->unit == ATA_MASTER) ? 0 : 1);
185	atp->driver = (void *)scp;
186    }
187}
188
189static void
190setup_async_cb(struct atapi_xpt_softc *scp, uint32_t events)
191{
192    struct ccb_setasync csa;
193
194    xpt_setup_ccb(&csa.ccb_h, scp->path, /*priority*/ 5);
195    csa.ccb_h.func_code = XPT_SASYNC_CB;
196    csa.event_enable = events;
197    csa.callback = &atapi_async;
198    csa.callback_arg = scp->sim;
199    xpt_action((union ccb *) &csa);
200}
201
202static void
203atapi_action(struct cam_sim *sim, union ccb *ccb)
204{
205    int s = splcam();
206
207    atapi_action1(sim, ccb);
208    splx(s);
209}
210
211static void
212atapi_action1(struct cam_sim *sim, union ccb *ccb)
213{
214    struct atapi_xpt_softc *softc = (struct atapi_xpt_softc*)cam_sim_softc(sim);
215    struct ccb_hdr *ccb_h = &ccb->ccb_h;
216    struct atapi_hcb *hcb = NULL;
217    int unit = cam_sim_unit(sim);
218    int bus = cam_sim_bus(sim);
219    int len;
220    char *buf;
221
222    switch (ccb_h->func_code) {
223    case XPT_PATH_INQ: {
224	struct ccb_pathinq *cpi = &ccb->cpi;
225
226	cpi->version_num = 1;
227	cpi->hba_inquiry = 0;
228	cpi->hba_misc = 0;
229	cpi->hba_eng_cnt = 0;
230	bzero(cpi->vuhba_flags, sizeof(cpi->vuhba_flags));
231	cpi->max_target = 1;
232	cpi->max_lun = 7;
233	cpi->async_flags = 0;
234	cpi->hpath_id = 0;
235	cpi->initiator_id = 7;
236	strncpy(cpi->sim_vid, "ATAPI-SIM", sizeof(cpi->sim_vid));
237	strncpy(cpi->hba_vid, "ATAPI", sizeof(cpi->hba_vid));
238	strncpy(cpi->dev_name, cam_sim_name(sim), sizeof cpi->dev_name);
239	cpi->unit_number = cam_sim_unit(sim);
240	cpi->bus_id = cam_sim_bus(sim);
241	if (softc->ata_ch && ccb_h->target_id >= 0) {
242	    switch (softc->ata_ch->device[ccb_h->target_id].mode) {
243	    case ATA_PIO1:
244		cpi->base_transfer_speed = 5200;
245		break;
246	    case ATA_PIO2:
247		cpi->base_transfer_speed = 7000;
248		break;
249	    case ATA_PIO3:
250		cpi->base_transfer_speed = 11000;
251		break;
252	    case ATA_PIO4:
253	    case ATA_DMA:
254	    case ATA_WDMA2:
255		cpi->base_transfer_speed = 16000;
256		break;
257	    case ATA_UDMA2:
258		cpi->base_transfer_speed = 33000;
259		break;
260	    case ATA_UDMA4:
261		cpi->base_transfer_speed = 66000;
262		break;
263	    case ATA_UDMA5:
264		cpi->base_transfer_speed = 100000;
265		break;
266	    case ATA_UDMA6:
267		cpi->base_transfer_speed = 133000;
268		break;
269	    default: cpi->base_transfer_speed = 3300;
270	    }
271	}
272	ccb->ccb_h.status = CAM_REQ_CMP;
273	xpt_done(ccb);
274	return;
275    }
276
277    case XPT_RESET_DEV:
278	/* should reset the device */
279#ifdef CAMDEBUG
280	xpt_print_path(ccb->ccb_h.path);
281	printf("dev reset");
282#endif
283	ccb->ccb_h.status = CAM_REQ_CMP;
284	xpt_done(ccb);
285	return;
286
287    case XPT_RESET_BUS:
288	/* should reset the ATA bus */
289#ifdef CAMDEBUG
290	xpt_print_path(ccb->ccb_h.path);
291	printf("bus reset");
292#endif
293	ccb->ccb_h.status = CAM_REQ_CMP;
294	xpt_done(ccb);
295	return;
296
297    case XPT_SET_TRAN_SETTINGS:
298	/* ignore these, we're not doing SCSI here */
299	ccb->ccb_h.status = CAM_REQ_CMP;
300	xpt_done(ccb);
301	return;
302
303    case XPT_GET_TRAN_SETTINGS: {
304	struct ccb_trans_settings *cts = &ccb->cts;
305
306	cts->flags |=
307	    (CCB_TRANS_SYNC_RATE_VALID | CCB_TRANS_SYNC_OFFSET_VALID |
308	     CCB_TRANS_BUS_WIDTH_VALID | CCB_TRANS_DISC_VALID |
309	     CCB_TRANS_TQ_VALID);
310	cts->flags &= ~(CCB_TRANS_DISC_ENB | CCB_TRANS_TAG_ENB);
311	cts->sync_period = 0;
312	cts->sync_offset = 0;
313	cts->bus_width = 8;
314	ccb->ccb_h.status = CAM_REQ_CMP;
315	xpt_done(ccb);
316	return;
317    }
318
319    case XPT_CALC_GEOMETRY: {
320	struct ccb_calc_geometry *ccg;
321	unsigned int size_mb;
322	unsigned int secs_per_cylinder;
323	int extended;
324
325	ccg = &ccb->ccg;
326	size_mb = ccg->volume_size / ((1024L * 1024L) / ccg->block_size);
327	extended = 1;
328
329	if (size_mb > 1024 && extended) {
330	    ccg->heads = 255;
331	    ccg->secs_per_track = 63;
332	} else {
333	    ccg->heads = 64;
334	    ccg->secs_per_track = 32;
335	}
336	secs_per_cylinder = ccg->heads * ccg->secs_per_track;
337	ccg->cylinders = ccg->volume_size / secs_per_cylinder;
338	ccb->ccb_h.status = CAM_REQ_CMP;
339	xpt_done(ccb);
340	return;
341    }
342
343    case XPT_SCSI_IO: {
344	struct ccb_scsiio *csio = &ccb->csio;
345	int tid = ccb_h->target_id, lid = ccb_h->target_lun;
346	struct ata_device *dev = get_ata_device(softc, tid);
347
348#ifdef CAMDEBUG
349	char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
350
351	printf("XPT_SCSI_IO (b%d u%d t%d l%d)\n", bus, unit, tid, lid);
352#endif
353	/* check that this request was not aborted already */
354	if ((ccb_h->status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
355#ifdef CAMDEBUG
356	    printf("Already in progress\n");
357#endif
358	    xpt_done(ccb);
359	    return;
360	}
361	if (dev == NULL) {
362#ifdef CAMDEBUG
363	    printf("Invalid target %d\n", tid);
364#endif
365	    ccb_h->status = CAM_TID_INVALID;
366	    xpt_done(ccb);
367	    return;
368	}
369	if (lid > 0) {
370#ifdef CAMDEBUG
371	    printf("Invalid LUN %d\n", lid);
372#endif
373	    ccb_h->status = CAM_LUN_INVALID;
374	    xpt_done(ccb);
375	    return;
376	}
377	if ((ccb_h->flags & CAM_SCATTER_VALID)) {
378	    /* scatter-gather not supported */
379	    xpt_print_path(ccb_h->path);
380	    printf("ATAPI-CAM does not support scatter-gather yet!\n");
381	    break;
382	}
383	if ((hcb = allocate_hcb(softc, unit, bus, ccb)) == NULL)
384	    goto action_oom;
385
386	ccb_h->status |= CAM_SIM_QUEUED;
387
388	bcopy((ccb_h->flags & CAM_CDB_POINTER) ?
389	      csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes,
390	      hcb->cmd, csio->cdb_len);
391#ifdef CAMDEBUG
392	printf("hcb@%p: %s\n",
393	       hcb, scsi_cdb_string(hcb->cmd, cdb_str, sizeof(cdb_str)));
394#endif
395
396	len = csio->dxfer_len;
397	buf = csio->data_ptr;
398
399	/* some SCSI commands require special processing */
400	switch (hcb->cmd[0]) {
401	case INQUIRY: {
402	    /*
403	     * many ATAPI devices seem to report more than
404	     * SHORT_INQUIRY_LENGTH bytes of available INQUIRY
405	     * information, but respond with some incorrect condition
406	     * when actually asked for it, so we are going to pretend
407	     * that only SHORT_INQUIRY_LENGTH are expected, anyway.
408	     */
409	    struct scsi_inquiry *inq = (struct scsi_inquiry *) &hcb->cmd[0];
410
411	    if (inq->byte2 == 0 && inq->page_code == 0 &&
412		inq->length > SHORT_INQUIRY_LENGTH) {
413		bzero(buf, len);
414		len = inq->length = SHORT_INQUIRY_LENGTH;
415	    }
416	    break;
417	}
418	case MODE_SELECT_6:
419	    /* FALLTHROUGH */
420
421	case MODE_SENSE_6:
422	    /*
423	     * not supported by ATAPI/MMC devices (per SCSI MMC spec)
424	     * translate to _10 equivalent.
425	     * (actually we should do this only if we have tried
426	     * MODE_foo_6 and received ILLEGAL_REQUEST or
427	     * INVALID COMMAND OPERATION CODE)
428	     * alternative fix: behave like a honest CAM transport,
429	     * do not muck with CDB contents, and change scsi_cd to
430	     * always use MODE_SENSE_10 in cdgetmode(), or let scsi_cd
431	     * know that this specific unit is an ATAPI/MMC one,
432	     * and in /that case/ use MODE_SENSE_10
433	     */
434
435#ifdef CAMDEBUG
436	    xpt_print_path(ccb_h->path);
437	    printf("Translating %s into _10 equivalent\n",
438		   (hcb->cmd[0] == MODE_SELECT_6) ?
439		   "MODE_SELECT_6" : "MODE_SENSE_6");
440#endif
441	    hcb->cmd[0] |= 0x40;
442	    hcb->cmd[6] = 0;
443	    hcb->cmd[7] = 0;
444	    hcb->cmd[8] = hcb->cmd[4];
445	    hcb->cmd[9] = hcb->cmd[5];
446	    hcb->cmd[4] = 0;
447	    hcb->cmd[5] = 0;
448	    break;
449
450	case READ_6:
451	    /* FALLTHROUGH */
452
453	case WRITE_6:
454#ifdef CAMDEBUG
455	    xpt_print_path(ccb_h->path);
456	    printf("Translating %s into _10 equivalent\n",
457		   (hcb->cmd[0] == READ_6) ? "READ_6" : "WRITE_6");
458#endif
459	    hcb->cmd[0] |= 0x20;
460	    hcb->cmd[9] = hcb->cmd[5];
461	    hcb->cmd[8] = hcb->cmd[4];
462	    hcb->cmd[7] = 0;
463	    hcb->cmd[6] = 0;
464	    hcb->cmd[5] = hcb->cmd[3];
465	    hcb->cmd[4] = hcb->cmd[2];
466	    hcb->cmd[3] = hcb->cmd[1] & 0x1f;
467	    hcb->cmd[2] = 0;
468	    hcb->cmd[1] = 0;
469	    break;
470	}
471
472	if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN && (len & 1)) {
473	    /* ATA always transfers an even number of bytes */
474	    if (!(buf = hcb->dxfer_alloc = malloc(++len, M_ATACAM,
475						  M_NOWAIT | M_ZERO)))
476		goto action_oom;
477	}
478	TAILQ_INSERT_TAIL(&softc->pending_hcbs, hcb, chain);
479	if (atapi_queue_cmd(dev, hcb->cmd, buf, len,
480			    (((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN) ?
481			    ATPR_F_READ : 0) | ATPR_F_QUIET,
482			    ccb_h->timeout, atapi_cb, (void *)hcb) == 0)
483	    return;
484	break;
485    }
486
487    default:
488	printf("atapi-cam: unsupported function code 0x%02x\n",
489	       ccb_h->func_code);
490	ccb_h->status = CAM_REQ_INVALID;
491	xpt_done(ccb);
492	return;
493    }
494
495action_oom:
496    if (hcb != NULL)
497	free_hcb(hcb);
498    xpt_print_path(ccb_h->path);
499    printf("Out of memory: freezing queue.");
500    softc->flags |= RESOURCE_SHORTAGE;
501    xpt_freeze_simq(sim, /*count*/ 1);
502    ccb_h->status = CAM_REQUEUE_REQ;
503    xpt_done(ccb);
504}
505
506static void
507atapi_poll(struct cam_sim *sim)
508{
509    /* do nothing - we do not actually service any interrupts */
510    printf("atapi_poll called!\n");
511}
512
513int
514atapi_cb(struct atapi_request *req)
515{
516    int s = splcam();
517    struct atapi_hcb *hcb = (struct atapi_hcb *) req->driver;
518    struct ccb_scsiio *csio = &hcb->ccb->csio;
519    int hcb_status = req->result;
520
521#ifdef CAMDEBUG
522    printf("atapi_cb: hcb@%p status = %02x: (sk = %02x%s%s%s)\n",
523	   hcb, hcb_status, hcb_status >> 4,
524	   (hcb_status & 4) ? " ABRT" : "",
525	   (hcb_status & 2) ? " EOM" : "",
526	   (hcb_status & 1) ? " ILI" : "");
527    printf("  %s: cmd %02x - sk=%02x asc=%02x ascq=%02x\n",
528	   req->device->name, req->ccb[0], req->sense.sense_key,
529	   req->sense.asc, req->sense.ascq);
530#endif
531    if (hcb_status != 0) {
532	hcb->ccb->csio.scsi_status = SCSI_STATUS_CHECK_COND;
533	if ((hcb->ccb->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0) {
534	    hcb->ccb->ccb_h.status |= CAM_AUTOSNS_VALID;
535	    bcopy((void *)&req->sense, (void *)&csio->sense_data,
536		  sizeof(struct atapi_reqsense));
537	}
538	free_hcb_and_ccb_done(hcb, CAM_SCSI_STATUS_ERROR);
539    }
540    else {
541	if (((hcb->ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) &&
542	    hcb->dxfer_alloc != NULL)
543	    bcopy(hcb->dxfer_alloc, csio->data_ptr, csio->dxfer_len);
544	hcb->ccb->csio.scsi_status = SCSI_STATUS_OK;
545	free_hcb_and_ccb_done(hcb, CAM_REQ_CMP);
546    }
547    splx(s);
548    return 0;
549}
550
551static void
552free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status)
553{
554    struct atapi_xpt_softc *softc = hcb->softc;
555    union ccb *ccb = hcb->ccb;
556
557    if (hcb != NULL) {
558	/* we're about to free a hcb, so the shortage has ended */
559	if (softc->flags & RESOURCE_SHORTAGE) {
560	    softc->flags &= ~RESOURCE_SHORTAGE;
561	    status |= CAM_RELEASE_SIMQ;
562	}
563	free_hcb(hcb);
564    }
565    ccb->ccb_h.status =
566	status | (ccb->ccb_h.status & ~(CAM_STATUS_MASK | CAM_SIM_QUEUED));
567    xpt_done(ccb);
568}
569
570static void
571atapi_async(void *callback_arg, u_int32_t code,
572	    struct cam_path *path, void *arg)
573{
574    int s = splcam();
575
576    atapi_async1(callback_arg, code, path, arg);
577    splx(s);
578}
579
580static void
581atapi_async1(void *callback_arg, u_int32_t code,
582	     struct cam_path* path, void *arg)
583{
584    struct atapi_xpt_softc *softc;
585    struct cam_sim *sim;
586    int targ;
587
588    sim = (struct cam_sim *) callback_arg;
589    softc = (struct atapi_xpt_softc *) cam_sim_softc(sim);
590    switch (code) {
591    case AC_LOST_DEVICE:
592	targ = xpt_path_target_id(path);
593	xpt_print_path(path);
594	if (targ == -1)
595		printf("Lost host adapter\n");
596	else
597		printf("Lost target %d???\n", targ);
598	break;
599
600    default:
601	break;
602    }
603}
604
605static void
606cam_rescan_callback(struct cam_periph *periph, union ccb *ccb)
607{
608#ifdef CAMDEBUG
609    xpt_print_path(ccb->ccb_h.path);
610	if (ccb->ccb_h.status != CAM_REQ_CMP)
611	    printf("Rescan failed, 0x%04x\n", ccb->ccb_h.status);
612	else
613	    printf("rescan succeeded\n");
614#endif
615	xpt_free_path(ccb->ccb_h.path);
616	free(ccb, M_ATACAM);
617}
618
619static void
620cam_rescan(struct cam_sim *sim)
621{
622    struct cam_path *path;
623    union ccb *ccb = malloc(sizeof(union ccb), M_ATACAM, M_WAITOK | M_ZERO);
624
625#ifdef CAMDEBUG
626    xpt_print_path(cam_sim_path(sim));
627    printf ("rescanning ATAPI bus.\n");
628#endif
629    if (xpt_create_path(&path, xpt_periph, cam_sim_path(sim),
630			CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP)
631	return;
632
633    xpt_setup_ccb(&ccb->ccb_h, path, 5/*priority (low)*/);
634    ccb->ccb_h.func_code = XPT_SCAN_BUS;
635    ccb->ccb_h.cbfcnp = cam_rescan_callback;
636    ccb->crcn.flags = CAM_FLAG_NONE;
637    xpt_action(ccb);
638    /* scan is in progress now */
639}
640
641static struct atapi_hcb *
642allocate_hcb(struct atapi_xpt_softc *softc, int unit, int bus, union ccb *ccb)
643{
644    struct atapi_hcb *hcb = (struct atapi_hcb *)
645    malloc(sizeof(struct atapi_hcb), M_ATACAM, M_NOWAIT | M_ZERO);
646
647    if (hcb != NULL) {
648	hcb->softc = softc;
649	hcb->unit = unit;
650	hcb->bus = bus;
651	hcb->ccb = ccb;
652    }
653    return hcb;
654}
655
656static void
657free_hcb(struct atapi_hcb *hcb)
658{
659    TAILQ_REMOVE(&hcb->softc->pending_hcbs, hcb, chain);
660    if (hcb->dxfer_alloc != NULL)
661	free(hcb->dxfer_alloc, M_ATACAM);
662    free(hcb, M_ATACAM);
663}
664
665static void
666free_softc(struct atapi_xpt_softc *scp)
667{
668    struct atapi_hcb *hcb;
669
670    if (scp != NULL) {
671	TAILQ_FOREACH(hcb, &scp->pending_hcbs, chain) {
672	    free_hcb_and_ccb_done(hcb, CAM_UNREC_HBA_ERROR);
673	}
674	if (scp->path != NULL) {
675	    setup_async_cb(scp, 0);
676	    xpt_free_path(scp->path);
677	}
678	if ((scp->flags & BUS_REGISTERED) != 0) {
679	    if (xpt_bus_deregister(cam_sim_path(scp->sim)) == CAM_REQ_CMP)
680		scp->flags &= ~BUS_REGISTERED;
681	}
682	if (scp->sim != NULL) {
683	    if ((scp->flags & BUS_REGISTERED) == 0)
684		cam_sim_free(scp->sim, /*free_devq*/TRUE);
685	    else
686		printf("Can't free %s SIM (still registered)\n",
687		       cam_sim_name(scp->sim));
688	}
689	LIST_REMOVE(scp, chain);
690	free(scp, M_ATACAM);
691    }
692}
693
694static struct ata_device *
695get_ata_device(struct atapi_xpt_softc *scp, int id)
696{
697    int role = ATA_ATAPI_MASTER;
698
699    switch (id) {
700    case 1:
701	role = ATA_ATAPI_SLAVE;
702	/* FALLTHROUGH */
703
704    case 0:
705	if (scp->ata_ch->devices & role)
706	    return &scp->ata_ch->device[id];
707	/* FALLTHROUGH */
708
709    default:
710	return NULL;
711    }
712}
713