1 | /* $NetBSD: viomb.c,v 1.7 2016/09/27 03:33:32 pgoyette Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2010 Minoura Makoto. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | */ |
27 | |
28 | #include <sys/cdefs.h> |
29 | __KERNEL_RCSID(0, "$NetBSD: viomb.c,v 1.7 2016/09/27 03:33:32 pgoyette Exp $" ); |
30 | |
31 | #include <sys/param.h> |
32 | #include <sys/systm.h> |
33 | #include <sys/kernel.h> |
34 | #include <sys/bus.h> |
35 | #include <sys/condvar.h> |
36 | #include <sys/device.h> |
37 | #include <sys/kthread.h> |
38 | #include <sys/mutex.h> |
39 | #include <sys/sysctl.h> |
40 | #include <uvm/uvm_page.h> |
41 | #include <sys/module.h> |
42 | |
43 | #include <dev/pci/pcidevs.h> |
44 | #include <dev/pci/pcireg.h> |
45 | #include <dev/pci/pcivar.h> |
46 | |
47 | #include <dev/pci/virtioreg.h> |
48 | #include <dev/pci/virtiovar.h> |
49 | |
50 | #include "ioconf.h" |
51 | |
52 | /* Configuration registers */ |
53 | #define VIRTIO_BALLOON_CONFIG_NUM_PAGES 0 /* 32bit */ |
54 | #define VIRTIO_BALLOON_CONFIG_ACTUAL 4 /* 32bit */ |
55 | |
56 | /* Feature bits */ |
57 | #define VIRTIO_BALLOON_F_MUST_TELL_HOST (1<<0) |
58 | #define VIRTIO_BALLOON_F_STATS_VQ (1<<1) |
59 | |
60 | #define VIRTIO_BALLOON_FLAG_BITS \ |
61 | VIRTIO_COMMON_FLAG_BITS \ |
62 | "\x02""STATS_VQ" \ |
63 | "\x01""MUST_TELL_HOST" |
64 | |
65 | #define PGS_PER_REQ (256) /* 1MB, 4KB/page */ |
66 | |
67 | CTASSERT((PAGE_SIZE) == (VIRTIO_PAGE_SIZE)); /* XXX */ |
68 | |
69 | struct balloon_req { |
70 | bus_dmamap_t bl_dmamap; |
71 | struct pglist bl_pglist; |
72 | int bl_nentries; |
73 | uint32_t bl_pages[PGS_PER_REQ]; |
74 | }; |
75 | |
76 | struct viomb_softc { |
77 | device_t sc_dev; |
78 | |
79 | struct virtio_softc *sc_virtio; |
80 | struct virtqueue sc_vq[2]; |
81 | |
82 | unsigned int sc_npages; |
83 | unsigned int sc_actual; |
84 | int sc_inflight; |
85 | struct balloon_req sc_req; |
86 | struct pglist sc_balloon_pages; |
87 | |
88 | int sc_inflate_done; |
89 | int sc_deflate_done; |
90 | |
91 | kcondvar_t sc_wait; |
92 | kmutex_t sc_waitlock; |
93 | }; |
94 | |
95 | static int balloon_initialized = 0; /* multiple balloon is not allowed */ |
96 | |
97 | static int viomb_match(device_t, cfdata_t, void *); |
98 | static void viomb_attach(device_t, device_t, void *); |
99 | static void viomb_read_config(struct viomb_softc *); |
100 | static int viomb_config_change(struct virtio_softc *); |
101 | static int inflate(struct viomb_softc *); |
102 | static int inflateq_done(struct virtqueue *); |
103 | static int inflate_done(struct viomb_softc *); |
104 | static int deflate(struct viomb_softc *); |
105 | static int deflateq_done(struct virtqueue *); |
106 | static int deflate_done(struct viomb_softc *); |
107 | static void viomb_thread(void *); |
108 | |
109 | CFATTACH_DECL_NEW(viomb, sizeof(struct viomb_softc), |
110 | viomb_match, viomb_attach, NULL, NULL); |
111 | |
112 | static int |
113 | viomb_match(device_t parent, cfdata_t match, void *aux) |
114 | { |
115 | struct virtio_softc *vsc = aux; |
116 | |
117 | if (vsc->sc_childdevid == PCI_PRODUCT_VIRTIO_BALLOON) |
118 | return 1; |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | static void |
124 | viomb_attach(device_t parent, device_t self, void *aux) |
125 | { |
126 | struct viomb_softc *sc = device_private(self); |
127 | struct virtio_softc *vsc = device_private(parent); |
128 | const struct sysctlnode *node; |
129 | uint32_t features; |
130 | char buf[256]; |
131 | |
132 | if (vsc->sc_child != NULL) { |
133 | aprint_normal(": child already attached for %s; " |
134 | "something wrong...\n" , device_xname(parent)); |
135 | return; |
136 | } |
137 | if (balloon_initialized++) { |
138 | aprint_normal(": balloon already exists; something wrong...\n" ); |
139 | goto err_none; |
140 | } |
141 | |
142 | sc->sc_dev = self; |
143 | sc->sc_virtio = vsc; |
144 | |
145 | vsc->sc_child = self; |
146 | vsc->sc_ipl = IPL_VM; |
147 | vsc->sc_vqs = &sc->sc_vq[0]; |
148 | vsc->sc_nvqs = 2; |
149 | vsc->sc_config_change = viomb_config_change; |
150 | vsc->sc_intrhand = virtio_vq_intr; |
151 | vsc->sc_flags = 0; |
152 | |
153 | features = virtio_negotiate_features(vsc, |
154 | VIRTIO_CONFIG_DEVICE_FEATURES); |
155 | |
156 | snprintb(buf, sizeof(buf), VIRTIO_BALLOON_FLAG_BITS, features); |
157 | aprint_normal(": Features: %s\n" , buf); |
158 | if ((virtio_alloc_vq(vsc, &sc->sc_vq[0], 0, |
159 | sizeof(uint32_t)*PGS_PER_REQ, 1, |
160 | "inflate" ) != 0) || |
161 | (virtio_alloc_vq(vsc, &sc->sc_vq[1], 1, |
162 | sizeof(uint32_t)*PGS_PER_REQ, 1, |
163 | "deflate" ) != 0)) { |
164 | goto err_none; |
165 | } |
166 | sc->sc_vq[0].vq_done = inflateq_done; |
167 | sc->sc_vq[1].vq_done = deflateq_done; |
168 | |
169 | viomb_read_config(sc); |
170 | sc->sc_inflight = 0; |
171 | TAILQ_INIT(&sc->sc_balloon_pages); |
172 | |
173 | if (bus_dmamap_create(vsc->sc_dmat, sizeof(uint32_t)*PGS_PER_REQ, |
174 | 1, sizeof(uint32_t)*PGS_PER_REQ, 0, |
175 | BUS_DMA_NOWAIT, &sc->sc_req.bl_dmamap)) { |
176 | aprint_error_dev(sc->sc_dev, "dmamap creation failed.\n" ); |
177 | goto err_vq; |
178 | } |
179 | if (bus_dmamap_load(vsc->sc_dmat, sc->sc_req.bl_dmamap, |
180 | &sc->sc_req.bl_pages[0], |
181 | sizeof(uint32_t) * PGS_PER_REQ, |
182 | NULL, BUS_DMA_NOWAIT)) { |
183 | aprint_error_dev(sc->sc_dev, "dmamap load failed.\n" ); |
184 | goto err_dmamap; |
185 | } |
186 | |
187 | sc->sc_inflate_done = sc->sc_deflate_done = 0; |
188 | mutex_init(&sc->sc_waitlock, MUTEX_DEFAULT, IPL_VM); /* spin */ |
189 | cv_init(&sc->sc_wait, "balloon" ); |
190 | |
191 | if (kthread_create(PRI_IDLE, KTHREAD_MPSAFE, NULL, |
192 | viomb_thread, sc, NULL, "viomb" )) { |
193 | aprint_error_dev(sc->sc_dev, "cannot create kthread.\n" ); |
194 | goto err_mutex; |
195 | } |
196 | |
197 | sysctl_createv(NULL, 0, NULL, &node, 0, CTLTYPE_NODE, |
198 | "viomb" , SYSCTL_DESCR("VirtIO Balloon status" ), |
199 | NULL, 0, NULL, 0, |
200 | CTL_HW, CTL_CREATE, CTL_EOL); |
201 | sysctl_createv(NULL, 0, NULL, NULL, 0, CTLTYPE_INT, |
202 | "npages" , SYSCTL_DESCR("VirtIO Balloon npages value" ), |
203 | NULL, 0, &sc->sc_npages, 0, |
204 | CTL_HW, node->sysctl_num, CTL_CREATE, CTL_EOL); |
205 | sysctl_createv(NULL, 0, NULL, NULL, 0, CTLTYPE_INT, |
206 | "actual" , SYSCTL_DESCR("VirtIO Balloon actual value" ), |
207 | NULL, 0, &sc->sc_actual, 0, |
208 | CTL_HW, node->sysctl_num, CTL_CREATE, CTL_EOL); |
209 | return; |
210 | |
211 | err_mutex: |
212 | cv_destroy(&sc->sc_wait); |
213 | mutex_destroy(&sc->sc_waitlock); |
214 | err_dmamap: |
215 | bus_dmamap_destroy(vsc->sc_dmat, sc->sc_req.bl_dmamap); |
216 | err_vq: |
217 | virtio_free_vq(vsc, &sc->sc_vq[1]); |
218 | virtio_free_vq(vsc, &sc->sc_vq[0]); |
219 | err_none: |
220 | vsc->sc_child = (void*)1; |
221 | return; |
222 | } |
223 | |
224 | static void |
225 | viomb_read_config(struct viomb_softc *sc) |
226 | { |
227 | unsigned int reg; |
228 | |
229 | /* these values are explicitly specified as little-endian */ |
230 | reg = virtio_read_device_config_4(sc->sc_virtio, |
231 | VIRTIO_BALLOON_CONFIG_NUM_PAGES); |
232 | sc->sc_npages = le32toh(reg); |
233 | |
234 | reg = virtio_read_device_config_4(sc->sc_virtio, |
235 | VIRTIO_BALLOON_CONFIG_ACTUAL); |
236 | sc->sc_actual = le32toh(reg); |
237 | } |
238 | |
239 | /* |
240 | * Config change callback: wakeup the kthread. |
241 | */ |
242 | static int |
243 | viomb_config_change(struct virtio_softc *vsc) |
244 | { |
245 | struct viomb_softc *sc = device_private(vsc->sc_child); |
246 | unsigned int old; |
247 | |
248 | old = sc->sc_npages; |
249 | viomb_read_config(sc); |
250 | mutex_enter(&sc->sc_waitlock); |
251 | cv_signal(&sc->sc_wait); |
252 | mutex_exit(&sc->sc_waitlock); |
253 | if (sc->sc_npages > old) |
254 | printf("%s: inflating balloon from %u to %u.\n" , |
255 | device_xname(sc->sc_dev), old, sc->sc_npages); |
256 | else if (sc->sc_npages < old) |
257 | printf("%s: deflating balloon from %u to %u.\n" , |
258 | device_xname(sc->sc_dev), old, sc->sc_npages); |
259 | |
260 | return 1; |
261 | } |
262 | |
263 | /* |
264 | * Inflate: consume some amount of physical memory. |
265 | */ |
266 | static int |
267 | inflate(struct viomb_softc *sc) |
268 | { |
269 | struct virtio_softc *vsc = sc->sc_virtio; |
270 | int i, slot; |
271 | uint64_t nvpages, nhpages; |
272 | struct balloon_req *b; |
273 | struct vm_page *p; |
274 | struct virtqueue *vq = &sc->sc_vq[0]; |
275 | |
276 | if (sc->sc_inflight) |
277 | return 0; |
278 | nvpages = sc->sc_npages - sc->sc_actual; |
279 | if (nvpages > PGS_PER_REQ) |
280 | nvpages = PGS_PER_REQ; |
281 | nhpages = nvpages * VIRTIO_PAGE_SIZE / PAGE_SIZE; |
282 | |
283 | b = &sc->sc_req; |
284 | if (uvm_pglistalloc(nhpages*PAGE_SIZE, 0, UINT32_MAX*PAGE_SIZE, |
285 | 0, 0, &b->bl_pglist, nhpages, 1)) { |
286 | printf("%s: %" PRIu64 " pages of physical memory " |
287 | "could not be allocated, retrying...\n" , |
288 | device_xname(sc->sc_dev), nhpages); |
289 | return 1; /* sleep longer */ |
290 | } |
291 | |
292 | b->bl_nentries = nvpages; |
293 | i = 0; |
294 | TAILQ_FOREACH(p, &b->bl_pglist, pageq.queue) { |
295 | b->bl_pages[i++] = p->phys_addr / VIRTIO_PAGE_SIZE; |
296 | } |
297 | KASSERT(i == nvpages); |
298 | |
299 | if (virtio_enqueue_prep(vsc, vq, &slot) != 0) { |
300 | printf("%s: inflate enqueue failed.\n" , |
301 | device_xname(sc->sc_dev)); |
302 | uvm_pglistfree(&b->bl_pglist); |
303 | return 0; |
304 | } |
305 | if (virtio_enqueue_reserve(vsc, vq, slot, 1)) { |
306 | printf("%s: inflate enqueue failed.\n" , |
307 | device_xname(sc->sc_dev)); |
308 | uvm_pglistfree(&b->bl_pglist); |
309 | return 0; |
310 | } |
311 | bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0, |
312 | sizeof(uint32_t)*nvpages, BUS_DMASYNC_PREWRITE); |
313 | virtio_enqueue(vsc, vq, slot, b->bl_dmamap, true); |
314 | virtio_enqueue_commit(vsc, vq, slot, true); |
315 | sc->sc_inflight += nvpages; |
316 | |
317 | return 0; |
318 | } |
319 | |
320 | static int |
321 | inflateq_done(struct virtqueue *vq) |
322 | { |
323 | struct virtio_softc *vsc = vq->vq_owner; |
324 | struct viomb_softc *sc = device_private(vsc->sc_child); |
325 | |
326 | mutex_enter(&sc->sc_waitlock); |
327 | sc->sc_inflate_done = 1; |
328 | cv_signal(&sc->sc_wait); |
329 | mutex_exit(&sc->sc_waitlock); |
330 | |
331 | return 1; |
332 | } |
333 | |
334 | static int |
335 | inflate_done(struct viomb_softc *sc) |
336 | { |
337 | struct virtio_softc *vsc = sc->sc_virtio; |
338 | struct virtqueue *vq = &sc->sc_vq[0]; |
339 | struct balloon_req *b; |
340 | int r, slot; |
341 | uint64_t nvpages; |
342 | struct vm_page *p; |
343 | |
344 | r = virtio_dequeue(vsc, vq, &slot, NULL); |
345 | if (r != 0) { |
346 | printf("%s: inflate dequeue failed, errno %d.\n" , |
347 | device_xname(sc->sc_dev), r); |
348 | return 1; |
349 | } |
350 | virtio_dequeue_commit(vsc, vq, slot); |
351 | |
352 | b = &sc->sc_req; |
353 | nvpages = b->bl_nentries; |
354 | bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, |
355 | offsetof(struct balloon_req, bl_pages), |
356 | sizeof(uint32_t)*nvpages, |
357 | BUS_DMASYNC_POSTWRITE); |
358 | while (!TAILQ_EMPTY(&b->bl_pglist)) { |
359 | p = TAILQ_FIRST(&b->bl_pglist); |
360 | TAILQ_REMOVE(&b->bl_pglist, p, pageq.queue); |
361 | TAILQ_INSERT_TAIL(&sc->sc_balloon_pages, p, pageq.queue); |
362 | } |
363 | |
364 | sc->sc_inflight -= nvpages; |
365 | virtio_write_device_config_4(vsc, |
366 | VIRTIO_BALLOON_CONFIG_ACTUAL, |
367 | sc->sc_actual + nvpages); |
368 | viomb_read_config(sc); |
369 | |
370 | return 1; |
371 | } |
372 | |
373 | /* |
374 | * Deflate: free previously allocated memory. |
375 | */ |
376 | static int |
377 | deflate(struct viomb_softc *sc) |
378 | { |
379 | struct virtio_softc *vsc = sc->sc_virtio; |
380 | int i, slot; |
381 | uint64_t nvpages, nhpages; |
382 | struct balloon_req *b; |
383 | struct vm_page *p; |
384 | struct virtqueue *vq = &sc->sc_vq[1]; |
385 | |
386 | nvpages = (sc->sc_actual + sc->sc_inflight) - sc->sc_npages; |
387 | if (nvpages > PGS_PER_REQ) |
388 | nvpages = PGS_PER_REQ; |
389 | nhpages = nvpages * VIRTIO_PAGE_SIZE / PAGE_SIZE; |
390 | |
391 | b = &sc->sc_req; |
392 | |
393 | b->bl_nentries = nvpages; |
394 | TAILQ_INIT(&b->bl_pglist); |
395 | for (i = 0; i < nhpages; i++) { |
396 | p = TAILQ_FIRST(&sc->sc_balloon_pages); |
397 | if (p == NULL) |
398 | break; |
399 | TAILQ_REMOVE(&sc->sc_balloon_pages, p, pageq.queue); |
400 | TAILQ_INSERT_TAIL(&b->bl_pglist, p, pageq.queue); |
401 | b->bl_pages[i] = p->phys_addr / VIRTIO_PAGE_SIZE; |
402 | } |
403 | |
404 | if (virtio_enqueue_prep(vsc, vq, &slot) != 0) { |
405 | printf("%s: deflate enqueue failed.\n" , |
406 | device_xname(sc->sc_dev)); |
407 | TAILQ_FOREACH_REVERSE(p, &b->bl_pglist, pglist, pageq.queue) { |
408 | TAILQ_REMOVE(&b->bl_pglist, p, pageq.queue); |
409 | TAILQ_INSERT_HEAD(&sc->sc_balloon_pages, p, |
410 | pageq.queue); |
411 | } |
412 | return 0; |
413 | } |
414 | if (virtio_enqueue_reserve(vsc, vq, slot, 1) != 0) { |
415 | printf("%s: deflate enqueue failed.\n" , |
416 | device_xname(sc->sc_dev)); |
417 | TAILQ_FOREACH_REVERSE(p, &b->bl_pglist, pglist, pageq.queue) { |
418 | TAILQ_REMOVE(&b->bl_pglist, p, pageq.queue); |
419 | TAILQ_INSERT_HEAD(&sc->sc_balloon_pages, p, |
420 | pageq.queue); |
421 | } |
422 | return 0; |
423 | } |
424 | bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, 0, |
425 | sizeof(uint32_t)*nvpages, BUS_DMASYNC_PREWRITE); |
426 | virtio_enqueue(vsc, vq, slot, b->bl_dmamap, true); |
427 | virtio_enqueue_commit(vsc, vq, slot, true); |
428 | sc->sc_inflight -= nvpages; |
429 | |
430 | if (!(vsc->sc_features & VIRTIO_BALLOON_F_MUST_TELL_HOST)) |
431 | uvm_pglistfree(&b->bl_pglist); |
432 | |
433 | return 0; |
434 | } |
435 | |
436 | static int |
437 | deflateq_done(struct virtqueue *vq) |
438 | { |
439 | struct virtio_softc *vsc = vq->vq_owner; |
440 | struct viomb_softc *sc = device_private(vsc->sc_child); |
441 | |
442 | mutex_enter(&sc->sc_waitlock); |
443 | sc->sc_deflate_done = 1; |
444 | cv_signal(&sc->sc_wait); |
445 | mutex_exit(&sc->sc_waitlock); |
446 | |
447 | return 1; |
448 | } |
449 | |
450 | static int |
451 | deflate_done(struct viomb_softc *sc) |
452 | { |
453 | struct virtio_softc *vsc = sc->sc_virtio; |
454 | struct virtqueue *vq = &sc->sc_vq[1]; |
455 | struct balloon_req *b; |
456 | int r, slot; |
457 | uint64_t nvpages; |
458 | |
459 | r = virtio_dequeue(vsc, vq, &slot, NULL); |
460 | if (r != 0) { |
461 | printf("%s: deflate dequeue failed, errno %d\n" , |
462 | device_xname(sc->sc_dev), r); |
463 | return 1; |
464 | } |
465 | virtio_dequeue_commit(vsc, vq, slot); |
466 | |
467 | b = &sc->sc_req; |
468 | nvpages = b->bl_nentries; |
469 | bus_dmamap_sync(vsc->sc_dmat, b->bl_dmamap, |
470 | offsetof(struct balloon_req, bl_pages), |
471 | sizeof(uint32_t)*nvpages, |
472 | BUS_DMASYNC_POSTWRITE); |
473 | |
474 | if (vsc->sc_features & VIRTIO_BALLOON_F_MUST_TELL_HOST) |
475 | uvm_pglistfree(&b->bl_pglist); |
476 | |
477 | sc->sc_inflight += nvpages; |
478 | virtio_write_device_config_4(vsc, |
479 | VIRTIO_BALLOON_CONFIG_ACTUAL, |
480 | sc->sc_actual - nvpages); |
481 | viomb_read_config(sc); |
482 | |
483 | return 1; |
484 | } |
485 | |
486 | /* |
487 | * Kthread: sleeps, eventually inflate and deflate. |
488 | */ |
489 | static void |
490 | viomb_thread(void *arg) |
491 | { |
492 | struct viomb_softc *sc = arg; |
493 | int sleeptime, r; |
494 | |
495 | for ( ; ; ) { |
496 | sleeptime = 30000; |
497 | if (sc->sc_npages > sc->sc_actual + sc->sc_inflight) { |
498 | if (sc->sc_inflight == 0) { |
499 | r = inflate(sc); |
500 | if (r != 0) |
501 | sleeptime = 10000; |
502 | else |
503 | sleeptime = 1000; |
504 | } else |
505 | sleeptime = 100; |
506 | } else if (sc->sc_npages < sc->sc_actual + sc->sc_inflight) { |
507 | if (sc->sc_inflight == 0) |
508 | r = deflate(sc); |
509 | sleeptime = 100; |
510 | } |
511 | |
512 | again: |
513 | mutex_enter(&sc->sc_waitlock); |
514 | if (sc->sc_inflate_done) { |
515 | sc->sc_inflate_done = 0; |
516 | mutex_exit(&sc->sc_waitlock); |
517 | inflate_done(sc); |
518 | goto again; |
519 | } |
520 | if (sc->sc_deflate_done) { |
521 | sc->sc_deflate_done = 0; |
522 | mutex_exit(&sc->sc_waitlock); |
523 | deflate_done(sc); |
524 | goto again; |
525 | } |
526 | cv_timedwait(&sc->sc_wait, &sc->sc_waitlock, |
527 | mstohz(sleeptime)); |
528 | mutex_exit(&sc->sc_waitlock); |
529 | } |
530 | } |
531 | |
532 | MODULE(MODULE_CLASS_DRIVER, viomb, "virtio" ); |
533 | |
534 | #ifdef _MODULE |
535 | #include "ioconf.c" |
536 | #endif |
537 | |
538 | static int |
539 | viomb_modcmd(modcmd_t cmd, void *opaque) |
540 | { |
541 | int error = 0; |
542 | |
543 | #ifdef _MODULE |
544 | switch (cmd) { |
545 | case MODULE_CMD_INIT: |
546 | error = config_init_component(cfdriver_ioconf_viomb, |
547 | cfattach_ioconf_viomb, cfdata_ioconf_viomb); |
548 | break; |
549 | case MODULE_CMD_FINI: |
550 | error = config_fini_component(cfdriver_ioconf_viomb, |
551 | cfattach_ioconf_viomb, cfdata_ioconf_viomb); |
552 | break; |
553 | default: |
554 | error = ENOTTY; |
555 | break; |
556 | } |
557 | #endif |
558 | |
559 | return error; |
560 | } |
561 | |