atapi-cam.c revision 101637 
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 101637 2002-08-10 11:56:03Z 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_poll(struct cam_sim *);
85static void atapi_async(void *, u_int32_t, struct cam_path *, void *);
86static void atapi_async1(void *, u_int32_t, struct cam_path *, void *);
87static int atapi_cb(struct atapi_request *);
88
89/* internal functions */
90static void setup_dev(struct atapi_xpt_softc *, struct ata_device *);
91static void setup_async_cb(struct atapi_xpt_softc *, uint32_t);
92static void cam_rescan_callback(struct cam_periph *, union ccb *);
93static void cam_rescan(struct cam_sim *);
94static void free_hcb_and_ccb_done(struct atapi_hcb *, u_int32_t);
95static struct atapi_hcb *allocate_hcb(struct atapi_xpt_softc *, int, int, union ccb *);
96static void free_hcb(struct atapi_hcb *hcb);
97static void free_softc(struct atapi_xpt_softc *scp);
98static struct ata_device *get_ata_device(struct atapi_xpt_softc *scp, int id);
99
100static MALLOC_DEFINE(M_ATACAM, "ATA CAM transport", "ATA driver CAM-XPT layer");
101
102void
103atapi_cam_attach_bus(struct ata_channel *ata_ch)
104{
105    struct atapi_xpt_softc *scp = NULL;
106    struct cam_devq *devq = NULL;
107    struct cam_sim *sim = NULL;
108    struct cam_path *path = NULL;
109    int unit;
110
111    LIST_FOREACH(scp, &all_buses, chain) {
112	if (scp->ata_ch == ata_ch)
113	    return;
114    }
115
116    if ((scp = malloc(sizeof(struct atapi_xpt_softc),
117		      M_ATACAM, M_NOWAIT | M_ZERO)) == NULL)
118	goto error;
119
120    scp->ata_ch = ata_ch;
121    TAILQ_INIT(&scp->pending_hcbs);
122    LIST_INSERT_HEAD(&all_buses, scp, chain);
123    unit = device_get_unit(ata_ch->dev);
124
125    if ((devq = cam_simq_alloc(16)) == NULL)
126	goto error;
127
128    if ((sim = cam_sim_alloc(atapi_action, atapi_poll, "ata",
129		 (void *)scp, unit, 1, 1, devq)) == NULL) {
130	cam_simq_free(devq);
131	goto error;
132    }
133    scp->sim = sim;
134
135    if (xpt_bus_register(sim, 0) != CAM_SUCCESS) {
136	goto error;
137    }
138    scp->flags |= BUS_REGISTERED;
139
140    if (xpt_create_path(&path, /*periph*/ NULL,
141		cam_sim_path(sim), CAM_TARGET_WILDCARD,
142		CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
143	goto error;
144    }
145    scp->path = path;
146
147#ifdef CAMDEBUG
148    xpt_print_path(path);
149    printf("Registered SIM for ata%d\n", unit);
150#endif
151
152    setup_async_cb(scp, AC_LOST_DEVICE);
153
154    if (ata_ch->devices & ATA_ATAPI_MASTER)
155	setup_dev(scp, &ata_ch->device[MASTER]);
156    if (ata_ch->devices & ATA_ATAPI_SLAVE)
157	setup_dev(scp, &ata_ch->device[SLAVE]);
158
159    cam_rescan(sim);
160    return;
161
162error:
163    free_softc(scp);
164}
165
166void
167atapi_cam_detach_bus(struct ata_channel *ata_ch)
168{
169    struct atapi_xpt_softc *scp;
170
171    LIST_FOREACH(scp, &all_buses, chain) {
172	if (scp->ata_ch == ata_ch)
173	    free_softc(scp);
174    }
175}
176
177static void
178setup_dev(struct atapi_xpt_softc *scp, struct ata_device *atp)
179{
180    if (atp->driver == NULL) {
181	ata_set_name(atp, "atapicam",
182		     2 * device_get_unit(atp->channel->dev) +
183		     (atp->unit == ATA_MASTER) ? 0 : 1);
184	atp->driver = (void *)scp;
185    }
186}
187
188static void
189setup_async_cb(struct atapi_xpt_softc *scp, uint32_t events)
190{
191    struct ccb_setasync csa;
192
193    xpt_setup_ccb(&csa.ccb_h, scp->path, /*priority*/ 5);
194    csa.ccb_h.func_code = XPT_SASYNC_CB;
195    csa.event_enable = events;
196    csa.callback = &atapi_async;
197    csa.callback_arg = scp->sim;
198    xpt_action((union ccb *) &csa);
199}
200
201static void
202atapi_action(struct cam_sim *sim, union ccb *ccb)
203{
204    struct atapi_xpt_softc *softc = (struct atapi_xpt_softc*)cam_sim_softc(sim);
205    struct ccb_hdr *ccb_h = &ccb->ccb_h;
206    struct atapi_hcb *hcb = NULL;
207    int unit = cam_sim_unit(sim);
208    int bus = cam_sim_bus(sim);
209    int len;
210    char *buf;
211
212    switch (ccb_h->func_code) {
213    case XPT_PATH_INQ: {
214	struct ccb_pathinq *cpi = &ccb->cpi;
215
216	cpi->version_num = 1;
217	cpi->hba_inquiry = 0;
218	cpi->hba_misc = 0;
219	cpi->hba_eng_cnt = 0;
220	bzero(cpi->vuhba_flags, sizeof(cpi->vuhba_flags));
221	cpi->max_target = 1;
222	cpi->max_lun = 0;
223	cpi->async_flags = 0;
224	cpi->hpath_id = 0;
225	cpi->initiator_id = 7;
226	strncpy(cpi->sim_vid, "FreeBSD", sizeof(cpi->sim_vid));
227	strncpy(cpi->hba_vid, "ATAPI", sizeof(cpi->hba_vid));
228	strncpy(cpi->dev_name, cam_sim_name(sim), sizeof cpi->dev_name);
229	cpi->unit_number = cam_sim_unit(sim);
230	cpi->bus_id = cam_sim_bus(sim);
231	if (softc->ata_ch && ccb_h->target_id >= 0) {
232	    switch (softc->ata_ch->device[ccb_h->target_id].mode) {
233	    case ATA_PIO1:
234		cpi->base_transfer_speed = 5200;
235		break;
236	    case ATA_PIO2:
237		cpi->base_transfer_speed = 7000;
238		break;
239	    case ATA_PIO3:
240		cpi->base_transfer_speed = 11000;
241		break;
242	    case ATA_PIO4:
243	    case ATA_DMA:
244	    case ATA_WDMA2:
245		cpi->base_transfer_speed = 16000;
246		break;
247	    case ATA_UDMA2:
248		cpi->base_transfer_speed = 33000;
249		break;
250	    case ATA_UDMA4:
251		cpi->base_transfer_speed = 66000;
252		break;
253	    case ATA_UDMA5:
254		cpi->base_transfer_speed = 100000;
255		break;
256	    case ATA_UDMA6:
257		cpi->base_transfer_speed = 133000;
258		break;
259	    default: cpi->base_transfer_speed = 3300;
260	    }
261	}
262	ccb->ccb_h.status = CAM_REQ_CMP;
263	xpt_done(ccb);
264	return;
265    }
266
267    case XPT_RESET_DEV:
268	/* should reset the device */
269#ifdef CAMDEBUG
270	xpt_print_path(ccb->ccb_h.path);
271	printf("dev reset");
272#endif
273	ccb->ccb_h.status = CAM_REQ_CMP;
274	xpt_done(ccb);
275	return;
276
277    case XPT_RESET_BUS:
278	/* should reset the ATA bus */
279#ifdef CAMDEBUG
280	xpt_print_path(ccb->ccb_h.path);
281	printf("bus reset");
282#endif
283	ccb->ccb_h.status = CAM_REQ_CMP;
284	xpt_done(ccb);
285	return;
286
287    case XPT_SET_TRAN_SETTINGS:
288	/* ignore these, we're not doing SCSI here */
289	ccb->ccb_h.status = CAM_REQ_CMP;
290	xpt_done(ccb);
291	return;
292
293    case XPT_GET_TRAN_SETTINGS: {
294	struct ccb_trans_settings *cts = &ccb->cts;
295
296	cts->flags |=
297	    (CCB_TRANS_SYNC_RATE_VALID | CCB_TRANS_SYNC_OFFSET_VALID |
298	     CCB_TRANS_BUS_WIDTH_VALID | CCB_TRANS_DISC_VALID |
299	     CCB_TRANS_TQ_VALID);
300	cts->flags &= ~(CCB_TRANS_DISC_ENB | CCB_TRANS_TAG_ENB);
301	cts->sync_period = 0;
302	cts->sync_offset = 0;
303	cts->bus_width = 16;
304	ccb->ccb_h.status = CAM_REQ_CMP;
305	xpt_done(ccb);
306	return;
307    }
308
309    case XPT_CALC_GEOMETRY: {
310	struct ccb_calc_geometry *ccg;
311	unsigned int size_mb;
312	unsigned int secs_per_cylinder;
313	int extended;
314
315	ccg = &ccb->ccg;
316	size_mb = ccg->volume_size / ((1024L * 1024L) / ccg->block_size);
317	extended = 1;
318
319	if (size_mb > 1024 && extended) {
320	    ccg->heads = 255;
321	    ccg->secs_per_track = 63;
322	} else {
323	    ccg->heads = 64;
324	    ccg->secs_per_track = 32;
325	}
326	secs_per_cylinder = ccg->heads * ccg->secs_per_track;
327	ccg->cylinders = ccg->volume_size / secs_per_cylinder;
328	ccb->ccb_h.status = CAM_REQ_CMP;
329	xpt_done(ccb);
330	return;
331    }
332
333    case XPT_SCSI_IO: {
334	struct ccb_scsiio *csio = &ccb->csio;
335	int tid = ccb_h->target_id, lid = ccb_h->target_lun;
336	struct ata_device *dev = get_ata_device(softc, tid);
337
338#ifdef CAMDEBUG
339	char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
340
341	printf("XPT_SCSI_IO (b%d u%d t%d l%d)\n", bus, unit, tid, lid);
342#endif
343	/* check that this request was not aborted already */
344	if ((ccb_h->status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
345#ifdef CAMDEBUG
346	    printf("Already in progress\n");
347#endif
348	    xpt_done(ccb);
349	    return;
350	}
351	if (dev == NULL) {
352#ifdef CAMDEBUG
353	    printf("Invalid target %d\n", tid);
354#endif
355	    ccb_h->status = CAM_TID_INVALID;
356	    xpt_done(ccb);
357	    return;
358	}
359	if (lid > 0) {
360#ifdef CAMDEBUG
361	    printf("Invalid LUN %d\n", lid);
362#endif
363	    ccb_h->status = CAM_LUN_INVALID;
364	    xpt_done(ccb);
365	    return;
366	}
367	if ((ccb_h->flags & CAM_SCATTER_VALID)) {
368	    /* scatter-gather not supported */
369	    xpt_print_path(ccb_h->path);
370	    printf("ATAPI-CAM does not support scatter-gather yet!\n");
371	    break;
372	}
373	if ((hcb = allocate_hcb(softc, unit, bus, ccb)) == NULL)
374	    goto action_oom;
375
376	ccb_h->status |= CAM_SIM_QUEUED;
377
378	bcopy((ccb_h->flags & CAM_CDB_POINTER) ?
379	      csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes,
380	      hcb->cmd, csio->cdb_len);
381#ifdef CAMDEBUG
382	printf("hcb@%p: %s\n",
383	       hcb, scsi_cdb_string(hcb->cmd, cdb_str, sizeof(cdb_str)));
384#endif
385
386	len = csio->dxfer_len;
387	buf = csio->data_ptr;
388
389	/* some SCSI commands require special processing */
390	switch (hcb->cmd[0]) {
391	case INQUIRY: {
392	    /*
393	     * many ATAPI devices seem to report more than
394	     * SHORT_INQUIRY_LENGTH bytes of available INQUIRY
395	     * information, but respond with some incorrect condition
396	     * when actually asked for it, so we are going to pretend
397	     * that only SHORT_INQUIRY_LENGTH are expected, anyway.
398	     */
399	    struct scsi_inquiry *inq = (struct scsi_inquiry *) &hcb->cmd[0];
400
401	    if (inq->byte2 == 0 && inq->page_code == 0 &&
402		inq->length > SHORT_INQUIRY_LENGTH) {
403		bzero(buf, len);
404		len = inq->length = SHORT_INQUIRY_LENGTH;
405	    }
406	    break;
407	}
408	case MODE_SELECT_6:
409	    /* FALLTHROUGH */
410
411	case MODE_SENSE_6:
412	    /*
413	     * not supported by ATAPI/MMC devices (per SCSI MMC spec)
414	     * translate to _10 equivalent.
415	     * (actually we should do this only if we have tried
416	     * MODE_foo_6 and received ILLEGAL_REQUEST or
417	     * INVALID COMMAND OPERATION CODE)
418	     * alternative fix: behave like a honest CAM transport,
419	     * do not muck with CDB contents, and change scsi_cd to
420	     * always use MODE_SENSE_10 in cdgetmode(), or let scsi_cd
421	     * know that this specific unit is an ATAPI/MMC one,
422	     * and in /that case/ use MODE_SENSE_10
423	     */
424
425#ifdef CAMDEBUG
426	    xpt_print_path(ccb_h->path);
427	    printf("Translating %s into _10 equivalent\n",
428		   (hcb->cmd[0] == MODE_SELECT_6) ?
429		   "MODE_SELECT_6" : "MODE_SENSE_6");
430#endif
431	    hcb->cmd[0] |= 0x40;
432	    hcb->cmd[6] = 0;
433	    hcb->cmd[7] = 0;
434	    hcb->cmd[8] = hcb->cmd[4];
435	    hcb->cmd[9] = hcb->cmd[5];
436	    hcb->cmd[4] = 0;
437	    hcb->cmd[5] = 0;
438	    break;
439
440	case READ_6:
441	    /* FALLTHROUGH */
442
443	case WRITE_6:
444#ifdef CAMDEBUG
445	    xpt_print_path(ccb_h->path);
446	    printf("Translating %s into _10 equivalent\n",
447		   (hcb->cmd[0] == READ_6) ? "READ_6" : "WRITE_6");
448#endif
449	    hcb->cmd[0] |= 0x20;
450	    hcb->cmd[9] = hcb->cmd[5];
451	    hcb->cmd[8] = hcb->cmd[4];
452	    hcb->cmd[7] = 0;
453	    hcb->cmd[6] = 0;
454	    hcb->cmd[5] = hcb->cmd[3];
455	    hcb->cmd[4] = hcb->cmd[2];
456	    hcb->cmd[3] = hcb->cmd[1] & 0x1f;
457	    hcb->cmd[2] = 0;
458	    hcb->cmd[1] = 0;
459	    break;
460	}
461
462	if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN && (len & 1)) {
463	    /* ATA always transfers an even number of bytes */
464	    if (!(buf = hcb->dxfer_alloc = malloc(++len, M_ATACAM,
465						  M_NOWAIT | M_ZERO)))
466		goto action_oom;
467	}
468	TAILQ_INSERT_TAIL(&softc->pending_hcbs, hcb, chain);
469	if (atapi_queue_cmd(dev, hcb->cmd, buf, len,
470			    (((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN) ?
471			    ATPR_F_READ : 0) | ATPR_F_QUIET,
472			    ccb_h->timeout, atapi_cb, (void *)hcb) == 0)
473	    return;
474	break;
475    }
476
477    default:
478	printf("atapi-cam: unsupported function code 0x%02x\n",
479	       ccb_h->func_code);
480	ccb_h->status = CAM_REQ_INVALID;
481	xpt_done(ccb);
482	return;
483    }
484
485action_oom:
486    if (hcb != NULL)
487	free_hcb(hcb);
488    xpt_print_path(ccb_h->path);
489    printf("Out of memory: freezing queue.");
490    softc->flags |= RESOURCE_SHORTAGE;
491    xpt_freeze_simq(sim, /*count*/ 1);
492    ccb_h->status = CAM_REQUEUE_REQ;
493    xpt_done(ccb);
494}
495
496static void
497atapi_poll(struct cam_sim *sim)
498{
499    /* do nothing - we do not actually service any interrupts */
500    printf("atapi_poll called!\n");
501}
502
503int
504atapi_cb(struct atapi_request *req)
505{
506    int s = splcam();
507    struct atapi_hcb *hcb = (struct atapi_hcb *) req->driver;
508    struct ccb_scsiio *csio = &hcb->ccb->csio;
509    int hcb_status = req->result;
510
511#ifdef CAMDEBUG
512    printf("atapi_cb: hcb@%p status = %02x: (sk = %02x%s%s%s)\n",
513	   hcb, hcb_status, hcb_status >> 4,
514	   (hcb_status & 4) ? " ABRT" : "",
515	   (hcb_status & 2) ? " EOM" : "",
516	   (hcb_status & 1) ? " ILI" : "");
517    printf("  %s: cmd %02x - sk=%02x asc=%02x ascq=%02x\n",
518	   req->device->name, req->ccb[0], req->sense.sense_key,
519	   req->sense.asc, req->sense.ascq);
520#endif
521    if (hcb_status != 0) {
522	hcb->ccb->csio.scsi_status = SCSI_STATUS_CHECK_COND;
523	if ((hcb->ccb->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0) {
524	    hcb->ccb->ccb_h.status |= CAM_AUTOSNS_VALID;
525	    bcopy((void *)&req->sense, (void *)&csio->sense_data,
526		  sizeof(struct atapi_reqsense));
527	}
528	free_hcb_and_ccb_done(hcb, CAM_SCSI_STATUS_ERROR);
529    }
530    else {
531	if (((hcb->ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) &&
532	    hcb->dxfer_alloc != NULL)
533	    bcopy(hcb->dxfer_alloc, csio->data_ptr, csio->dxfer_len);
534	hcb->ccb->csio.scsi_status = SCSI_STATUS_OK;
535	free_hcb_and_ccb_done(hcb, CAM_REQ_CMP);
536    }
537    splx(s);
538    return 0;
539}
540
541static void
542free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status)
543{
544    struct atapi_xpt_softc *softc = hcb->softc;
545    union ccb *ccb = hcb->ccb;
546
547    if (hcb != NULL) {
548	/* we're about to free a hcb, so the shortage has ended */
549	if (softc->flags & RESOURCE_SHORTAGE) {
550	    softc->flags &= ~RESOURCE_SHORTAGE;
551	    status |= CAM_RELEASE_SIMQ;
552	}
553	free_hcb(hcb);
554    }
555    ccb->ccb_h.status =
556	status | (ccb->ccb_h.status & ~(CAM_STATUS_MASK | CAM_SIM_QUEUED));
557    xpt_done(ccb);
558}
559
560static void
561atapi_async(void *callback_arg, u_int32_t code,
562	    struct cam_path *path, void *arg)
563{
564    int s = splcam();
565
566    atapi_async1(callback_arg, code, path, arg);
567    splx(s);
568}
569
570static void
571atapi_async1(void *callback_arg, u_int32_t code,
572	     struct cam_path* path, void *arg)
573{
574    struct atapi_xpt_softc *softc;
575    struct cam_sim *sim;
576    int targ;
577
578    sim = (struct cam_sim *) callback_arg;
579    softc = (struct atapi_xpt_softc *) cam_sim_softc(sim);
580    switch (code) {
581    case AC_LOST_DEVICE:
582	targ = xpt_path_target_id(path);
583	xpt_print_path(path);
584	if (targ == -1)
585		printf("Lost host adapter\n");
586	else
587		printf("Lost target %d???\n", targ);
588	break;
589
590    default:
591	break;
592    }
593}
594
595static void
596cam_rescan_callback(struct cam_periph *periph, union ccb *ccb)
597{
598#ifdef CAMDEBUG
599    xpt_print_path(ccb->ccb_h.path);
600	if (ccb->ccb_h.status != CAM_REQ_CMP)
601	    printf("Rescan failed, 0x%04x\n", ccb->ccb_h.status);
602	else
603	    printf("rescan succeeded\n");
604#endif
605	xpt_free_path(ccb->ccb_h.path);
606	free(ccb, M_ATACAM);
607}
608
609static void
610cam_rescan(struct cam_sim *sim)
611{
612    struct cam_path *path;
613    union ccb *ccb = malloc(sizeof(union ccb), M_ATACAM, M_WAITOK | M_ZERO);
614
615#ifdef CAMDEBUG
616    xpt_print_path(cam_sim_path(sim));
617    printf ("rescanning ATAPI bus.\n");
618#endif
619    if (xpt_create_path(&path, xpt_periph, cam_sim_path(sim),
620			CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP)
621	return;
622
623    xpt_setup_ccb(&ccb->ccb_h, path, 5/*priority (low)*/);
624    ccb->ccb_h.func_code = XPT_SCAN_BUS;
625    ccb->ccb_h.cbfcnp = cam_rescan_callback;
626    ccb->crcn.flags = CAM_FLAG_NONE;
627    xpt_action(ccb);
628    /* scan is in progress now */
629}
630
631static struct atapi_hcb *
632allocate_hcb(struct atapi_xpt_softc *softc, int unit, int bus, union ccb *ccb)
633{
634    struct atapi_hcb *hcb = (struct atapi_hcb *)
635    malloc(sizeof(struct atapi_hcb), M_ATACAM, M_NOWAIT | M_ZERO);
636
637    if (hcb != NULL) {
638	hcb->softc = softc;
639	hcb->unit = unit;
640	hcb->bus = bus;
641	hcb->ccb = ccb;
642    }
643    return hcb;
644}
645
646static void
647free_hcb(struct atapi_hcb *hcb)
648{
649    TAILQ_REMOVE(&hcb->softc->pending_hcbs, hcb, chain);
650    if (hcb->dxfer_alloc != NULL)
651	free(hcb->dxfer_alloc, M_ATACAM);
652    free(hcb, M_ATACAM);
653}
654
655static void
656free_softc(struct atapi_xpt_softc *scp)
657{
658    struct atapi_hcb *hcb;
659
660    if (scp != NULL) {
661	TAILQ_FOREACH(hcb, &scp->pending_hcbs, chain) {
662	    free_hcb_and_ccb_done(hcb, CAM_UNREC_HBA_ERROR);
663	}
664	if (scp->path != NULL) {
665	    setup_async_cb(scp, 0);
666	    xpt_free_path(scp->path);
667	}
668	if ((scp->flags & BUS_REGISTERED) != 0) {
669	    if (xpt_bus_deregister(cam_sim_path(scp->sim)) == CAM_REQ_CMP)
670		scp->flags &= ~BUS_REGISTERED;
671	}
672	if (scp->sim != NULL) {
673	    if ((scp->flags & BUS_REGISTERED) == 0)
674		cam_sim_free(scp->sim, /*free_devq*/TRUE);
675	    else
676		printf("Can't free %s SIM (still registered)\n",
677		       cam_sim_name(scp->sim));
678	}
679	LIST_REMOVE(scp, chain);
680	free(scp, M_ATACAM);
681    }
682}
683
684static struct ata_device *
685get_ata_device(struct atapi_xpt_softc *scp, int id)
686{
687    int role = ATA_ATAPI_MASTER;
688
689    switch (id) {
690    case 1:
691	role = ATA_ATAPI_SLAVE;
692	/* FALLTHROUGH */
693
694    case 0:
695	if (scp->ata_ch->devices & role)
696	    return &scp->ata_ch->device[id];
697	/* FALLTHROUGH */
698
699    default:
700	return NULL;
701    }
702}
703