xref: /freebsd/sys/crypto/ccp/ccp.c (revision 22cf89c938886d14f5796fc49f9f020c23ea8eaf) 
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2017 Chelsio Communications, Inc.
5  * Copyright (c) 2017 Conrad Meyer <cem@FreeBSD.org>
6  * All rights reserved.
7  * Largely borrowed from ccr(4), Written by: John Baldwin <jhb@FreeBSD.org>
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 #include <sys/cdefs.h>
32 #include "opt_ddb.h"
33 
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/lock.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/mutex.h>
40 #include <sys/module.h>
41 #include <sys/random.h>
42 #include <sys/sglist.h>
43 #include <sys/sysctl.h>
44 
45 #ifdef DDB
46 #include <ddb/ddb.h>
47 #endif
48 
49 #include <dev/pci/pcivar.h>
50 
51 #include <dev/random/randomdev.h>
52 
53 #include <opencrypto/cryptodev.h>
54 #include <opencrypto/xform.h>
55 
56 #include "cryptodev_if.h"
57 
58 #include "ccp.h"
59 #include "ccp_hardware.h"
60 
61 MALLOC_DEFINE(M_CCP, "ccp", "AMD CCP crypto");
62 
63 /*
64  * Need a global softc available for garbage random_source API, which lacks any
65  * context pointer.  It's also handy for debugging.
66  */
67 struct ccp_softc *g_ccp_softc;
68 
69 bool g_debug_print = false;
70 SYSCTL_BOOL(_hw_ccp, OID_AUTO, debug, CTLFLAG_RWTUN, &g_debug_print, 0,
71     "Set to enable debugging log messages");
72 
73 static struct pciid {
74 	uint32_t devid;
75 	const char *desc;
76 } ccp_ids[] = {
77 	{ 0x14561022, "AMD CCP-5a" },
78 	{ 0x14681022, "AMD CCP-5b" },
79 	{ 0x15df1022, "AMD CCP-5a" },
80 };
81 
82 static struct random_source random_ccp = {
83 	.rs_ident = "AMD CCP TRNG",
84 	.rs_source = RANDOM_PURE_CCP,
85 	.rs_read = random_ccp_read,
86 };
87 
88 /*
89  * ccp_populate_sglist() generates a scatter/gather list that covers the entire
90  * crypto operation buffer.
91  */
92 static int
93 ccp_populate_sglist(struct sglist *sg, struct crypto_buffer *cb)
94 {
95 	int error;
96 
97 	sglist_reset(sg);
98 	switch (cb->cb_type) {
99 	case CRYPTO_BUF_MBUF:
100 		error = sglist_append_mbuf(sg, cb->cb_mbuf);
101 		break;
102 	case CRYPTO_BUF_SINGLE_MBUF:
103 		error = sglist_append_single_mbuf(sg, cb->cb_mbuf);
104 		break;
105 	case CRYPTO_BUF_UIO:
106 		error = sglist_append_uio(sg, cb->cb_uio);
107 		break;
108 	case CRYPTO_BUF_CONTIG:
109 		error = sglist_append(sg, cb->cb_buf, cb->cb_buf_len);
110 		break;
111 	case CRYPTO_BUF_VMPAGE:
112 		error = sglist_append_vmpages(sg, cb->cb_vm_page,
113 		    cb->cb_vm_page_offset, cb->cb_vm_page_len);
114 		break;
115 	default:
116 		error = EINVAL;
117 	}
118 	return (error);
119 }
120 
121 static int
122 ccp_probe(device_t dev)
123 {
124 	struct pciid *ip;
125 	uint32_t id;
126 
127 	id = pci_get_devid(dev);
128 	for (ip = ccp_ids; ip < &ccp_ids[nitems(ccp_ids)]; ip++) {
129 		if (id == ip->devid) {
130 			device_set_desc(dev, ip->desc);
131 			return (0);
132 		}
133 	}
134 	return (ENXIO);
135 }
136 
137 static void
138 ccp_initialize_queues(struct ccp_softc *sc)
139 {
140 	struct ccp_queue *qp;
141 	size_t i;
142 
143 	for (i = 0; i < nitems(sc->queues); i++) {
144 		qp = &sc->queues[i];
145 
146 		qp->cq_softc = sc;
147 		qp->cq_qindex = i;
148 		mtx_init(&qp->cq_lock, "ccp queue", NULL, MTX_DEF);
149 		/* XXX - arbitrarily chosen sizes */
150 		qp->cq_sg_crp = sglist_alloc(32, M_WAITOK);
151 		/* Two more SGEs than sg_crp to accommodate ipad. */
152 		qp->cq_sg_ulptx = sglist_alloc(34, M_WAITOK);
153 		qp->cq_sg_dst = sglist_alloc(2, M_WAITOK);
154 	}
155 }
156 
157 static void
158 ccp_free_queues(struct ccp_softc *sc)
159 {
160 	struct ccp_queue *qp;
161 	size_t i;
162 
163 	for (i = 0; i < nitems(sc->queues); i++) {
164 		qp = &sc->queues[i];
165 
166 		mtx_destroy(&qp->cq_lock);
167 		sglist_free(qp->cq_sg_crp);
168 		sglist_free(qp->cq_sg_ulptx);
169 		sglist_free(qp->cq_sg_dst);
170 	}
171 }
172 
173 static int
174 ccp_attach(device_t dev)
175 {
176 	struct ccp_softc *sc;
177 	int error;
178 
179 	sc = device_get_softc(dev);
180 	sc->dev = dev;
181 
182 	sc->cid = crypto_get_driverid(dev, sizeof(struct ccp_session),
183 	    CRYPTOCAP_F_HARDWARE);
184 	if (sc->cid < 0) {
185 		device_printf(dev, "could not get crypto driver id\n");
186 		return (ENXIO);
187 	}
188 
189 	error = ccp_hw_attach(dev);
190 	if (error != 0)
191 		return (error);
192 
193 	mtx_init(&sc->lock, "ccp", NULL, MTX_DEF);
194 
195 	ccp_initialize_queues(sc);
196 
197 	if (g_ccp_softc == NULL) {
198 		g_ccp_softc = sc;
199 		if ((sc->hw_features & VERSION_CAP_TRNG) != 0)
200 			random_source_register(&random_ccp);
201 	}
202 
203 	return (0);
204 }
205 
206 static int
207 ccp_detach(device_t dev)
208 {
209 	struct ccp_softc *sc;
210 
211 	sc = device_get_softc(dev);
212 
213 	mtx_lock(&sc->lock);
214 	sc->detaching = true;
215 	mtx_unlock(&sc->lock);
216 
217 	crypto_unregister_all(sc->cid);
218 	if (g_ccp_softc == sc && (sc->hw_features & VERSION_CAP_TRNG) != 0)
219 		random_source_deregister(&random_ccp);
220 
221 	ccp_hw_detach(dev);
222 	ccp_free_queues(sc);
223 
224 	if (g_ccp_softc == sc)
225 		g_ccp_softc = NULL;
226 
227 	mtx_destroy(&sc->lock);
228 	return (0);
229 }
230 
231 static void
232 ccp_init_hmac_digest(struct ccp_session *s, const char *key, int klen)
233 {
234 	union authctx auth_ctx;
235 	const struct auth_hash *axf;
236 	u_int i;
237 
238 	/*
239 	 * If the key is larger than the block size, use the digest of
240 	 * the key as the key instead.
241 	 */
242 	axf = s->hmac.auth_hash;
243 	if (klen > axf->blocksize) {
244 		axf->Init(&auth_ctx);
245 		axf->Update(&auth_ctx, key, klen);
246 		axf->Final(s->hmac.ipad, &auth_ctx);
247 		explicit_bzero(&auth_ctx, sizeof(auth_ctx));
248 		klen = axf->hashsize;
249 	} else
250 		memcpy(s->hmac.ipad, key, klen);
251 
252 	memset(s->hmac.ipad + klen, 0, axf->blocksize - klen);
253 	memcpy(s->hmac.opad, s->hmac.ipad, axf->blocksize);
254 
255 	for (i = 0; i < axf->blocksize; i++) {
256 		s->hmac.ipad[i] ^= HMAC_IPAD_VAL;
257 		s->hmac.opad[i] ^= HMAC_OPAD_VAL;
258 	}
259 }
260 
261 static bool
262 ccp_aes_check_keylen(int alg, int klen)
263 {
264 
265 	switch (klen * 8) {
266 	case 128:
267 	case 192:
268 		if (alg == CRYPTO_AES_XTS)
269 			return (false);
270 		break;
271 	case 256:
272 		break;
273 	case 512:
274 		if (alg != CRYPTO_AES_XTS)
275 			return (false);
276 		break;
277 	default:
278 		return (false);
279 	}
280 	return (true);
281 }
282 
283 static void
284 ccp_aes_setkey(struct ccp_session *s, int alg, const void *key, int klen)
285 {
286 	unsigned kbits;
287 
288 	if (alg == CRYPTO_AES_XTS)
289 		kbits = (klen / 2) * 8;
290 	else
291 		kbits = klen * 8;
292 
293 	switch (kbits) {
294 	case 128:
295 		s->blkcipher.cipher_type = CCP_AES_TYPE_128;
296 		break;
297 	case 192:
298 		s->blkcipher.cipher_type = CCP_AES_TYPE_192;
299 		break;
300 	case 256:
301 		s->blkcipher.cipher_type = CCP_AES_TYPE_256;
302 		break;
303 	default:
304 		panic("should not get here");
305 	}
306 
307 	s->blkcipher.key_len = klen;
308 	memcpy(s->blkcipher.enckey, key, s->blkcipher.key_len);
309 }
310 
311 static bool
312 ccp_auth_supported(struct ccp_softc *sc,
313     const struct crypto_session_params *csp)
314 {
315 
316 	if ((sc->hw_features & VERSION_CAP_SHA) == 0)
317 		return (false);
318 	switch (csp->csp_auth_alg) {
319 	case CRYPTO_SHA1_HMAC:
320 	case CRYPTO_SHA2_256_HMAC:
321 	case CRYPTO_SHA2_384_HMAC:
322 	case CRYPTO_SHA2_512_HMAC:
323 		if (csp->csp_auth_key == NULL)
324 			return (false);
325 		break;
326 	default:
327 		return (false);
328 	}
329 	return (true);
330 }
331 
332 static bool
333 ccp_cipher_supported(struct ccp_softc *sc,
334     const struct crypto_session_params *csp)
335 {
336 
337 	if ((sc->hw_features & VERSION_CAP_AES) == 0)
338 		return (false);
339 	switch (csp->csp_cipher_alg) {
340 	case CRYPTO_AES_CBC:
341 		if (csp->csp_ivlen != AES_BLOCK_LEN)
342 			return (false);
343 		break;
344 	case CRYPTO_AES_ICM:
345 		if (csp->csp_ivlen != AES_BLOCK_LEN)
346 			return (false);
347 		break;
348 	case CRYPTO_AES_XTS:
349 		if (csp->csp_ivlen != AES_XTS_IV_LEN)
350 			return (false);
351 		break;
352 	default:
353 		return (false);
354 	}
355 	return (ccp_aes_check_keylen(csp->csp_cipher_alg,
356 	    csp->csp_cipher_klen));
357 }
358 
359 static int
360 ccp_probesession(device_t dev, const struct crypto_session_params *csp)
361 {
362 	struct ccp_softc *sc;
363 
364 	if (csp->csp_flags != 0)
365 		return (EINVAL);
366 	sc = device_get_softc(dev);
367 	switch (csp->csp_mode) {
368 	case CSP_MODE_DIGEST:
369 		if (!ccp_auth_supported(sc, csp))
370 			return (EINVAL);
371 		break;
372 	case CSP_MODE_CIPHER:
373 		if (!ccp_cipher_supported(sc, csp))
374 			return (EINVAL);
375 		break;
376 	case CSP_MODE_AEAD:
377 		switch (csp->csp_cipher_alg) {
378 		case CRYPTO_AES_NIST_GCM_16:
379 			if ((sc->hw_features & VERSION_CAP_AES) == 0)
380 				return (EINVAL);
381 			break;
382 		default:
383 			return (EINVAL);
384 		}
385 		break;
386 	case CSP_MODE_ETA:
387 		if (!ccp_auth_supported(sc, csp) ||
388 		    !ccp_cipher_supported(sc, csp))
389 			return (EINVAL);
390 		break;
391 	default:
392 		return (EINVAL);
393 	}
394 
395 	return (CRYPTODEV_PROBE_HARDWARE);
396 }
397 
398 static int
399 ccp_newsession(device_t dev, crypto_session_t cses,
400     const struct crypto_session_params *csp)
401 {
402 	struct ccp_softc *sc;
403 	struct ccp_session *s;
404 	const struct auth_hash *auth_hash;
405 	enum ccp_aes_mode cipher_mode;
406 	unsigned auth_mode;
407 	unsigned q;
408 
409 	/* XXX reconcile auth_mode with use by ccp_sha */
410 	switch (csp->csp_auth_alg) {
411 	case CRYPTO_SHA1_HMAC:
412 		auth_hash = &auth_hash_hmac_sha1;
413 		auth_mode = SHA1;
414 		break;
415 	case CRYPTO_SHA2_256_HMAC:
416 		auth_hash = &auth_hash_hmac_sha2_256;
417 		auth_mode = SHA2_256;
418 		break;
419 	case CRYPTO_SHA2_384_HMAC:
420 		auth_hash = &auth_hash_hmac_sha2_384;
421 		auth_mode = SHA2_384;
422 		break;
423 	case CRYPTO_SHA2_512_HMAC:
424 		auth_hash = &auth_hash_hmac_sha2_512;
425 		auth_mode = SHA2_512;
426 		break;
427 	default:
428 		auth_hash = NULL;
429 		auth_mode = 0;
430 		break;
431 	}
432 
433 	switch (csp->csp_cipher_alg) {
434 	case CRYPTO_AES_CBC:
435 		cipher_mode = CCP_AES_MODE_CBC;
436 		break;
437 	case CRYPTO_AES_ICM:
438 		cipher_mode = CCP_AES_MODE_CTR;
439 		break;
440 	case CRYPTO_AES_NIST_GCM_16:
441 		cipher_mode = CCP_AES_MODE_GCTR;
442 		break;
443 	case CRYPTO_AES_XTS:
444 		cipher_mode = CCP_AES_MODE_XTS;
445 		break;
446 	default:
447 		cipher_mode = CCP_AES_MODE_ECB;
448 		break;
449 	}
450 
451 	sc = device_get_softc(dev);
452 	mtx_lock(&sc->lock);
453 	if (sc->detaching) {
454 		mtx_unlock(&sc->lock);
455 		return (ENXIO);
456 	}
457 
458 	s = crypto_get_driver_session(cses);
459 
460 	/* Just grab the first usable queue for now. */
461 	for (q = 0; q < nitems(sc->queues); q++)
462 		if ((sc->valid_queues & (1 << q)) != 0)
463 			break;
464 	if (q == nitems(sc->queues)) {
465 		mtx_unlock(&sc->lock);
466 		return (ENXIO);
467 	}
468 	s->queue = q;
469 
470 	switch (csp->csp_mode) {
471 	case CSP_MODE_AEAD:
472 		s->mode = GCM;
473 		break;
474 	case CSP_MODE_ETA:
475 		s->mode = AUTHENC;
476 		break;
477 	case CSP_MODE_DIGEST:
478 		s->mode = HMAC;
479 		break;
480 	case CSP_MODE_CIPHER:
481 		s->mode = BLKCIPHER;
482 		break;
483 	}
484 
485 	if (s->mode == GCM) {
486 		if (csp->csp_auth_mlen == 0)
487 			s->gmac.hash_len = AES_GMAC_HASH_LEN;
488 		else
489 			s->gmac.hash_len = csp->csp_auth_mlen;
490 	} else if (auth_hash != NULL) {
491 		s->hmac.auth_hash = auth_hash;
492 		s->hmac.auth_mode = auth_mode;
493 		if (csp->csp_auth_mlen == 0)
494 			s->hmac.hash_len = auth_hash->hashsize;
495 		else
496 			s->hmac.hash_len = csp->csp_auth_mlen;
497 		ccp_init_hmac_digest(s, csp->csp_auth_key, csp->csp_auth_klen);
498 	}
499 	if (cipher_mode != CCP_AES_MODE_ECB) {
500 		s->blkcipher.cipher_mode = cipher_mode;
501 		if (csp->csp_cipher_key != NULL)
502 			ccp_aes_setkey(s, csp->csp_cipher_alg,
503 			    csp->csp_cipher_key, csp->csp_cipher_klen);
504 	}
505 
506 	s->active = true;
507 	mtx_unlock(&sc->lock);
508 
509 	return (0);
510 }
511 
512 static void
513 ccp_freesession(device_t dev, crypto_session_t cses)
514 {
515 	struct ccp_session *s;
516 
517 	s = crypto_get_driver_session(cses);
518 
519 	if (s->pending != 0)
520 		device_printf(dev,
521 		    "session %p freed with %d pending requests\n", s,
522 		    s->pending);
523 	s->active = false;
524 }
525 
526 static int
527 ccp_process(device_t dev, struct cryptop *crp, int hint)
528 {
529 	const struct crypto_session_params *csp;
530 	struct ccp_softc *sc;
531 	struct ccp_queue *qp;
532 	struct ccp_session *s;
533 	int error;
534 	bool qpheld;
535 
536 	qpheld = false;
537 	qp = NULL;
538 
539 	csp = crypto_get_params(crp->crp_session);
540 	s = crypto_get_driver_session(crp->crp_session);
541 	sc = device_get_softc(dev);
542 	mtx_lock(&sc->lock);
543 	qp = &sc->queues[s->queue];
544 	mtx_unlock(&sc->lock);
545 	error = ccp_queue_acquire_reserve(qp, 1 /* placeholder */, M_NOWAIT);
546 	if (error != 0)
547 		goto out;
548 	qpheld = true;
549 
550 	error = ccp_populate_sglist(qp->cq_sg_crp, &crp->crp_buf);
551 	if (error != 0)
552 		goto out;
553 
554 	if (crp->crp_auth_key != NULL) {
555 		KASSERT(s->hmac.auth_hash != NULL, ("auth key without HMAC"));
556 		ccp_init_hmac_digest(s, crp->crp_auth_key, csp->csp_auth_klen);
557 	}
558 	if (crp->crp_cipher_key != NULL)
559 		ccp_aes_setkey(s, csp->csp_cipher_alg, crp->crp_cipher_key,
560 		    csp->csp_cipher_klen);
561 
562 	switch (s->mode) {
563 	case HMAC:
564 		if (s->pending != 0) {
565 			error = EAGAIN;
566 			break;
567 		}
568 		error = ccp_hmac(qp, s, crp);
569 		break;
570 	case BLKCIPHER:
571 		if (s->pending != 0) {
572 			error = EAGAIN;
573 			break;
574 		}
575 		error = ccp_blkcipher(qp, s, crp);
576 		break;
577 	case AUTHENC:
578 		if (s->pending != 0) {
579 			error = EAGAIN;
580 			break;
581 		}
582 		error = ccp_authenc(qp, s, crp);
583 		break;
584 	case GCM:
585 		if (s->pending != 0) {
586 			error = EAGAIN;
587 			break;
588 		}
589 		error = ccp_gcm(qp, s, crp);
590 		break;
591 	}
592 
593 	if (error == 0)
594 		s->pending++;
595 
596 out:
597 	if (qpheld) {
598 		if (error != 0) {
599 			/*
600 			 * Squash EAGAIN so callers don't uselessly and
601 			 * expensively retry if the ring was full.
602 			 */
603 			if (error == EAGAIN)
604 				error = ENOMEM;
605 			ccp_queue_abort(qp);
606 		} else
607 			ccp_queue_release(qp);
608 	}
609 
610 	if (error != 0) {
611 		DPRINTF(dev, "%s: early error:%d\n", __func__, error);
612 		crp->crp_etype = error;
613 		crypto_done(crp);
614 	}
615 	return (0);
616 }
617 
618 static device_method_t ccp_methods[] = {
619 	DEVMETHOD(device_probe,		ccp_probe),
620 	DEVMETHOD(device_attach,	ccp_attach),
621 	DEVMETHOD(device_detach,	ccp_detach),
622 
623 	DEVMETHOD(cryptodev_probesession, ccp_probesession),
624 	DEVMETHOD(cryptodev_newsession,	ccp_newsession),
625 	DEVMETHOD(cryptodev_freesession, ccp_freesession),
626 	DEVMETHOD(cryptodev_process,	ccp_process),
627 
628 	DEVMETHOD_END
629 };
630 
631 static driver_t ccp_driver = {
632 	"ccp",
633 	ccp_methods,
634 	sizeof(struct ccp_softc)
635 };
636 
637 DRIVER_MODULE(ccp, pci, ccp_driver, NULL, NULL);
638 MODULE_VERSION(ccp, 1);
639 MODULE_DEPEND(ccp, crypto, 1, 1, 1);
640 MODULE_DEPEND(ccp, random_device, 1, 1, 1);
641 #if 0	/* There are enough known issues that we shouldn't load automatically */
642 MODULE_PNP_INFO("W32:vendor/device", pci, ccp, ccp_ids,
643     nitems(ccp_ids));
644 #endif
645 
646 static int
647 ccp_queue_reserve_space(struct ccp_queue *qp, unsigned n, int mflags)
648 {
649 	struct ccp_softc *sc;
650 
651 	mtx_assert(&qp->cq_lock, MA_OWNED);
652 	sc = qp->cq_softc;
653 
654 	if (n < 1 || n >= (1 << sc->ring_size_order))
655 		return (EINVAL);
656 
657 	while (true) {
658 		if (ccp_queue_get_ring_space(qp) >= n)
659 			return (0);
660 		if ((mflags & M_WAITOK) == 0)
661 			return (EAGAIN);
662 		qp->cq_waiting = true;
663 		msleep(&qp->cq_tail, &qp->cq_lock, 0, "ccpqfull", 0);
664 	}
665 }
666 
667 int
668 ccp_queue_acquire_reserve(struct ccp_queue *qp, unsigned n, int mflags)
669 {
670 	int error;
671 
672 	mtx_lock(&qp->cq_lock);
673 	qp->cq_acq_tail = qp->cq_tail;
674 	error = ccp_queue_reserve_space(qp, n, mflags);
675 	if (error != 0)
676 		mtx_unlock(&qp->cq_lock);
677 	return (error);
678 }
679 
680 void
681 ccp_queue_release(struct ccp_queue *qp)
682 {
683 
684 	mtx_assert(&qp->cq_lock, MA_OWNED);
685 	if (qp->cq_tail != qp->cq_acq_tail) {
686 		wmb();
687 		ccp_queue_write_tail(qp);
688 	}
689 	mtx_unlock(&qp->cq_lock);
690 }
691 
692 void
693 ccp_queue_abort(struct ccp_queue *qp)
694 {
695 	unsigned i;
696 
697 	mtx_assert(&qp->cq_lock, MA_OWNED);
698 
699 	/* Wipe out any descriptors associated with this aborted txn. */
700 	for (i = qp->cq_acq_tail; i != qp->cq_tail;
701 	    i = (i + 1) % (1 << qp->cq_softc->ring_size_order)) {
702 		memset(&qp->desc_ring[i], 0, sizeof(qp->desc_ring[i]));
703 	}
704 	qp->cq_tail = qp->cq_acq_tail;
705 
706 	mtx_unlock(&qp->cq_lock);
707 }
708 
709 #ifdef DDB
710 #define	_db_show_lock(lo)	LOCK_CLASS(lo)->lc_ddb_show(lo)
711 #define	db_show_lock(lk)	_db_show_lock(&(lk)->lock_object)
712 static void
713 db_show_ccp_sc(struct ccp_softc *sc)
714 {
715 
716 	db_printf("ccp softc at %p\n", sc);
717 	db_printf(" cid: %d\n", (int)sc->cid);
718 
719 	db_printf(" lock: ");
720 	db_show_lock(&sc->lock);
721 
722 	db_printf(" detaching: %d\n", (int)sc->detaching);
723 	db_printf(" ring_size_order: %u\n", sc->ring_size_order);
724 
725 	db_printf(" hw_version: %d\n", (int)sc->hw_version);
726 	db_printf(" hw_features: %b\n", (int)sc->hw_features,
727 	    "\20\24ELFC\23TRNG\22Zip_Compress\16Zip_Decompress\13ECC\12RSA"
728 	    "\11SHA\0103DES\07AES");
729 
730 	db_printf(" hw status:\n");
731 	db_ccp_show_hw(sc);
732 }
733 
734 static void
735 db_show_ccp_qp(struct ccp_queue *qp)
736 {
737 
738 	db_printf(" lock: ");
739 	db_show_lock(&qp->cq_lock);
740 
741 	db_printf(" cq_qindex: %u\n", qp->cq_qindex);
742 	db_printf(" cq_softc: %p\n", qp->cq_softc);
743 
744 	db_printf(" head: %u\n", qp->cq_head);
745 	db_printf(" tail: %u\n", qp->cq_tail);
746 	db_printf(" acq_tail: %u\n", qp->cq_acq_tail);
747 	db_printf(" desc_ring: %p\n", qp->desc_ring);
748 	db_printf(" completions_ring: %p\n", qp->completions_ring);
749 	db_printf(" descriptors (phys): 0x%jx\n",
750 	    (uintmax_t)qp->desc_ring_bus_addr);
751 
752 	db_printf(" hw status:\n");
753 	db_ccp_show_queue_hw(qp);
754 }
755 
756 DB_SHOW_COMMAND(ccp, db_show_ccp)
757 {
758 	struct ccp_softc *sc;
759 	unsigned unit, qindex;
760 
761 	if (!have_addr)
762 		goto usage;
763 
764 	unit = (unsigned)addr;
765 
766 	sc = devclass_get_softc(devclass_find("ccp"), unit);
767 	if (sc == NULL) {
768 		db_printf("No such device ccp%u\n", unit);
769 		goto usage;
770 	}
771 
772 	if (count == -1) {
773 		db_show_ccp_sc(sc);
774 		return;
775 	}
776 
777 	qindex = (unsigned)count;
778 	if (qindex >= nitems(sc->queues)) {
779 		db_printf("No such queue %u\n", qindex);
780 		goto usage;
781 	}
782 	db_show_ccp_qp(&sc->queues[qindex]);
783 	return;
784 
785 usage:
786 	db_printf("usage: show ccp <unit>[,<qindex>]\n");
787 	return;
788 }
789 #endif /* DDB */
790