xref: /freebsd/sys/dev/proto/proto_busdma.c (revision f7c32ed617858bcd22f8d1b03199099d50125721) 
1 /*-
2  * Copyright (c) 2015, 2019 Marcel Moolenaar
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  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28 
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <machine/bus.h>
32 #include <machine/bus_dma.h>
33 #include <machine/resource.h>
34 #include <sys/bus.h>
35 #include <sys/conf.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
39 #include <sys/proc.h>
40 #include <sys/queue.h>
41 #include <sys/rman.h>
42 #include <sys/sbuf.h>
43 #include <sys/sx.h>
44 #include <sys/uio.h>
45 #include <vm/vm.h>
46 #include <vm/pmap.h>
47 #include <vm/vm_map.h>
48 
49 #include <dev/proto/proto.h>
50 #include <dev/proto/proto_dev.h>
51 #include <dev/proto/proto_busdma.h>
52 
53 MALLOC_DEFINE(M_PROTO_BUSDMA, "proto_busdma", "DMA management data");
54 
55 #define	BNDRY_MIN(a, b)		\
56 	(((a) == 0) ? (b) : (((b) == 0) ? (a) : MIN((a), (b))))
57 
58 struct proto_callback_bundle {
59 	struct proto_busdma *busdma;
60 	struct proto_md *md;
61 	struct proto_ioc_busdma *ioc;
62 };
63 
64 static int
65 proto_busdma_tag_create(struct proto_busdma *busdma, struct proto_tag *parent,
66     struct proto_ioc_busdma *ioc)
67 {
68 	struct proto_tag *tag;
69 
70 	/* Make sure that when a boundary is specified, it's a power of 2 */
71 	if (ioc->u.tag.bndry != 0 &&
72 	    (ioc->u.tag.bndry & (ioc->u.tag.bndry - 1)) != 0)
73 		return (EINVAL);
74 
75 	/*
76 	 * If nsegs is 1, ignore maxsegsz. What this means is that if we have
77 	 * just 1 segment, then maxsz should be equal to maxsegsz. To keep it
78 	 * simple for us, limit maxsegsz to maxsz in any case.
79 	 */
80 	if (ioc->u.tag.maxsegsz > ioc->u.tag.maxsz || ioc->u.tag.nsegs == 1)
81 		ioc->u.tag.maxsegsz = ioc->u.tag.maxsz;
82 
83 	tag = malloc(sizeof(*tag), M_PROTO_BUSDMA, M_WAITOK | M_ZERO);
84 	if (parent != NULL) {
85 		tag->parent = parent;
86 		LIST_INSERT_HEAD(&parent->children, tag, peers);
87 		tag->align = MAX(ioc->u.tag.align, parent->align);
88 		tag->bndry = BNDRY_MIN(ioc->u.tag.bndry, parent->bndry);
89 		tag->maxaddr = MIN(ioc->u.tag.maxaddr, parent->maxaddr);
90 		tag->maxsz = MIN(ioc->u.tag.maxsz, parent->maxsz);
91 		tag->maxsegsz = MIN(ioc->u.tag.maxsegsz, parent->maxsegsz);
92 		tag->nsegs = MIN(ioc->u.tag.nsegs, parent->nsegs);
93 		tag->datarate = MIN(ioc->u.tag.datarate, parent->datarate);
94 		/* Write constraints back */
95 		ioc->u.tag.align = tag->align;
96 		ioc->u.tag.bndry = tag->bndry;
97 		ioc->u.tag.maxaddr = tag->maxaddr;
98 		ioc->u.tag.maxsz = tag->maxsz;
99 		ioc->u.tag.maxsegsz = tag->maxsegsz;
100 		ioc->u.tag.nsegs = tag->nsegs;
101 		ioc->u.tag.datarate = tag->datarate;
102 	} else {
103 		tag->align = ioc->u.tag.align;
104 		tag->bndry = ioc->u.tag.bndry;
105 		tag->maxaddr = ioc->u.tag.maxaddr;
106 		tag->maxsz = ioc->u.tag.maxsz;
107 		tag->maxsegsz = ioc->u.tag.maxsegsz;
108 		tag->nsegs = ioc->u.tag.nsegs;
109 		tag->datarate = ioc->u.tag.datarate;
110 	}
111 	LIST_INSERT_HEAD(&busdma->tags, tag, tags);
112 	ioc->result = (uintptr_t)(void *)tag;
113 	return (0);
114 }
115 
116 static int
117 proto_busdma_tag_destroy(struct proto_busdma *busdma, struct proto_tag *tag)
118 {
119 
120 	if (!LIST_EMPTY(&tag->mds))
121 		return (EBUSY);
122 	if (!LIST_EMPTY(&tag->children))
123 		return (EBUSY);
124 
125 	if (tag->parent != NULL) {
126 		LIST_REMOVE(tag, peers);
127 		tag->parent = NULL;
128 	}
129 	LIST_REMOVE(tag, tags);
130 	free(tag, M_PROTO_BUSDMA);
131 	return (0);
132 }
133 
134 static struct proto_tag *
135 proto_busdma_tag_lookup(struct proto_busdma *busdma, u_long key)
136 {
137 	struct proto_tag *tag;
138 
139 	LIST_FOREACH(tag, &busdma->tags, tags) {
140 		if ((void *)tag == (void *)key)
141 			return (tag);
142 	}
143 	return (NULL);
144 }
145 
146 static int
147 proto_busdma_md_destroy_internal(struct proto_busdma *busdma,
148     struct proto_md *md)
149 {
150 
151 	LIST_REMOVE(md, mds);
152 	LIST_REMOVE(md, peers);
153 	if (md->physaddr)
154 		bus_dmamap_unload(md->bd_tag, md->bd_map);
155 	if (md->virtaddr != NULL)
156 		bus_dmamem_free(md->bd_tag, md->virtaddr, md->bd_map);
157 	else
158 		bus_dmamap_destroy(md->bd_tag, md->bd_map);
159 	bus_dma_tag_destroy(md->bd_tag);
160 	free(md, M_PROTO_BUSDMA);
161 	return (0);
162 }
163 
164 static void
165 proto_busdma_mem_alloc_callback(void *arg, bus_dma_segment_t *segs, int	nseg,
166     int error)
167 {
168 	struct proto_callback_bundle *pcb = arg;
169 
170 	pcb->ioc->u.md.bus_nsegs = nseg;
171 	pcb->ioc->u.md.bus_addr = segs[0].ds_addr;
172 }
173 
174 static int
175 proto_busdma_mem_alloc(struct proto_busdma *busdma, struct proto_tag *tag,
176     struct proto_ioc_busdma *ioc)
177 {
178 	struct proto_callback_bundle pcb;
179 	struct proto_md *md;
180 	int error;
181 
182 	md = malloc(sizeof(*md), M_PROTO_BUSDMA, M_WAITOK | M_ZERO);
183 	md->tag = tag;
184 
185 	error = bus_dma_tag_create(busdma->bd_roottag, tag->align, tag->bndry,
186 	    tag->maxaddr, BUS_SPACE_MAXADDR, NULL, NULL, tag->maxsz,
187 	    tag->nsegs, tag->maxsegsz, 0, NULL, NULL, &md->bd_tag);
188 	if (error) {
189 		free(md, M_PROTO_BUSDMA);
190 		return (error);
191 	}
192 	error = bus_dmamem_alloc(md->bd_tag, &md->virtaddr, 0, &md->bd_map);
193 	if (error) {
194 		bus_dma_tag_destroy(md->bd_tag);
195 		free(md, M_PROTO_BUSDMA);
196 		return (error);
197 	}
198 	md->physaddr = pmap_kextract((uintptr_t)(md->virtaddr));
199 	pcb.busdma = busdma;
200 	pcb.md = md;
201 	pcb.ioc = ioc;
202 	error = bus_dmamap_load(md->bd_tag, md->bd_map, md->virtaddr,
203 	    tag->maxsz, proto_busdma_mem_alloc_callback, &pcb, BUS_DMA_NOWAIT);
204 	if (error) {
205 		bus_dmamem_free(md->bd_tag, md->virtaddr, md->bd_map);
206 		bus_dma_tag_destroy(md->bd_tag);
207 		free(md, M_PROTO_BUSDMA);
208 		return (error);
209 	}
210 	LIST_INSERT_HEAD(&tag->mds, md, peers);
211 	LIST_INSERT_HEAD(&busdma->mds, md, mds);
212 	ioc->u.md.virt_addr = (uintptr_t)md->virtaddr;
213 	ioc->u.md.virt_size = tag->maxsz;
214 	ioc->u.md.phys_nsegs = 1;
215 	ioc->u.md.phys_addr = md->physaddr;
216 	ioc->result = (uintptr_t)(void *)md;
217 	return (0);
218 }
219 
220 static int
221 proto_busdma_mem_free(struct proto_busdma *busdma, struct proto_md *md)
222 {
223 
224 	if (md->virtaddr == NULL)
225 		return (ENXIO);
226 	return (proto_busdma_md_destroy_internal(busdma, md));
227 }
228 
229 static int
230 proto_busdma_md_create(struct proto_busdma *busdma, struct proto_tag *tag,
231     struct proto_ioc_busdma *ioc)
232 {
233 	struct proto_md *md;
234 	int error;
235 
236 	md = malloc(sizeof(*md), M_PROTO_BUSDMA, M_WAITOK | M_ZERO);
237 	md->tag = tag;
238 
239 	error = bus_dma_tag_create(busdma->bd_roottag, tag->align, tag->bndry,
240 	    tag->maxaddr, BUS_SPACE_MAXADDR, NULL, NULL, tag->maxsz,
241 	    tag->nsegs, tag->maxsegsz, 0, NULL, NULL, &md->bd_tag);
242 	if (error) {
243 		free(md, M_PROTO_BUSDMA);
244 		return (error);
245 	}
246 	error = bus_dmamap_create(md->bd_tag, 0, &md->bd_map);
247 	if (error) {
248 		bus_dma_tag_destroy(md->bd_tag);
249 		free(md, M_PROTO_BUSDMA);
250 		return (error);
251 	}
252 
253 	LIST_INSERT_HEAD(&tag->mds, md, peers);
254 	LIST_INSERT_HEAD(&busdma->mds, md, mds);
255 	ioc->result = (uintptr_t)(void *)md;
256 	return (0);
257 }
258 
259 static int
260 proto_busdma_md_destroy(struct proto_busdma *busdma, struct proto_md *md)
261 {
262 
263 	if (md->virtaddr != NULL)
264 		return (ENXIO);
265 	return (proto_busdma_md_destroy_internal(busdma, md));
266 }
267 
268 static void
269 proto_busdma_md_load_callback(void *arg, bus_dma_segment_t *segs, int nseg,
270     bus_size_t sz, int error)
271 {
272 	struct proto_callback_bundle *pcb = arg;
273 
274 	pcb->ioc->u.md.bus_nsegs = nseg;
275 	pcb->ioc->u.md.bus_addr = segs[0].ds_addr;
276 }
277 
278 static int
279 proto_busdma_md_load(struct proto_busdma *busdma, struct proto_md *md,
280     struct proto_ioc_busdma *ioc, struct thread *td)
281 {
282 	struct proto_callback_bundle pcb;
283 	struct iovec iov;
284 	struct uio uio;
285 	pmap_t pmap;
286 	int error;
287 
288 	iov.iov_base = (void *)(uintptr_t)ioc->u.md.virt_addr;
289 	iov.iov_len = ioc->u.md.virt_size;
290 	uio.uio_iov = &iov;
291 	uio.uio_iovcnt = 1;
292 	uio.uio_offset = 0;
293 	uio.uio_resid = iov.iov_len;
294 	uio.uio_segflg = UIO_USERSPACE;
295 	uio.uio_rw = UIO_READ;
296 	uio.uio_td = td;
297 
298 	pcb.busdma = busdma;
299 	pcb.md = md;
300 	pcb.ioc = ioc;
301 	error = bus_dmamap_load_uio(md->bd_tag, md->bd_map, &uio,
302 	    proto_busdma_md_load_callback, &pcb, BUS_DMA_NOWAIT);
303 	if (error)
304 		return (error);
305 
306 	/* XXX determine *all* physical memory segments */
307 	pmap = vmspace_pmap(td->td_proc->p_vmspace);
308 	md->physaddr = pmap_extract(pmap, ioc->u.md.virt_addr);
309 	ioc->u.md.phys_nsegs = 1;	/* XXX */
310 	ioc->u.md.phys_addr = md->physaddr;
311 	return (0);
312 }
313 
314 static int
315 proto_busdma_md_unload(struct proto_busdma *busdma, struct proto_md *md)
316 {
317 
318 	if (!md->physaddr)
319 		return (ENXIO);
320 	bus_dmamap_unload(md->bd_tag, md->bd_map);
321 	md->physaddr = 0;
322 	return (0);
323 }
324 
325 static int
326 proto_busdma_sync(struct proto_busdma *busdma, struct proto_md *md,
327     struct proto_ioc_busdma *ioc)
328 {
329 	u_int ops;
330 
331 	ops = BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE |
332 	    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE;
333 	if (ioc->u.sync.op & ~ops)
334 		return (EINVAL);
335 	if (!md->physaddr)
336 		return (ENXIO);
337 	bus_dmamap_sync(md->bd_tag, md->bd_map, ioc->u.sync.op);
338 	return (0);
339 }
340 
341 static struct proto_md *
342 proto_busdma_md_lookup(struct proto_busdma *busdma, u_long key)
343 {
344 	struct proto_md *md;
345 
346 	LIST_FOREACH(md, &busdma->mds, mds) {
347 		if ((void *)md == (void *)key)
348 			return (md);
349 	}
350 	return (NULL);
351 }
352 
353 struct proto_busdma *
354 proto_busdma_attach(struct proto_softc *sc)
355 {
356 	struct proto_busdma *busdma;
357 
358 	busdma = malloc(sizeof(*busdma), M_PROTO_BUSDMA, M_WAITOK | M_ZERO);
359 	sx_init(&busdma->sxlck, "proto-busdma");
360 	return (busdma);
361 }
362 
363 int
364 proto_busdma_detach(struct proto_softc *sc, struct proto_busdma *busdma)
365 {
366 
367 	proto_busdma_cleanup(sc, busdma);
368 	sx_destroy(&busdma->sxlck);
369 	free(busdma, M_PROTO_BUSDMA);
370 	return (0);
371 }
372 
373 int
374 proto_busdma_cleanup(struct proto_softc *sc, struct proto_busdma *busdma)
375 {
376 	struct proto_md *md, *md1;
377 	struct proto_tag *tag, *tag1;
378 
379 	sx_xlock(&busdma->sxlck);
380 	LIST_FOREACH_SAFE(md, &busdma->mds, mds, md1)
381 		proto_busdma_md_destroy_internal(busdma, md);
382 	LIST_FOREACH_SAFE(tag, &busdma->tags, tags, tag1)
383 		proto_busdma_tag_destroy(busdma, tag);
384 	sx_xunlock(&busdma->sxlck);
385 	return (0);
386 }
387 
388 int
389 proto_busdma_ioctl(struct proto_softc *sc, struct proto_busdma *busdma,
390     struct proto_ioc_busdma *ioc, struct thread *td)
391 {
392 	struct proto_tag *tag;
393 	struct proto_md *md;
394 	int error;
395 
396 	sx_xlock(&busdma->sxlck);
397 
398 	error = 0;
399 	switch (ioc->request) {
400 	case PROTO_IOC_BUSDMA_TAG_CREATE:
401 		busdma->bd_roottag = bus_get_dma_tag(sc->sc_dev);
402 		error = proto_busdma_tag_create(busdma, NULL, ioc);
403 		break;
404 	case PROTO_IOC_BUSDMA_TAG_DERIVE:
405 		tag = proto_busdma_tag_lookup(busdma, ioc->key);
406 		if (tag == NULL) {
407 			error = EINVAL;
408 			break;
409 		}
410 		error = proto_busdma_tag_create(busdma, tag, ioc);
411 		break;
412 	case PROTO_IOC_BUSDMA_TAG_DESTROY:
413 		tag = proto_busdma_tag_lookup(busdma, ioc->key);
414 		if (tag == NULL) {
415 			error = EINVAL;
416 			break;
417 		}
418 		error = proto_busdma_tag_destroy(busdma, tag);
419 		break;
420 	case PROTO_IOC_BUSDMA_MEM_ALLOC:
421 		tag = proto_busdma_tag_lookup(busdma, ioc->u.md.tag);
422 		if (tag == NULL) {
423 			error = EINVAL;
424 			break;
425 		}
426 		error = proto_busdma_mem_alloc(busdma, tag, ioc);
427 		break;
428 	case PROTO_IOC_BUSDMA_MEM_FREE:
429 		md = proto_busdma_md_lookup(busdma, ioc->key);
430 		if (md == NULL) {
431 			error = EINVAL;
432 			break;
433 		}
434 		error = proto_busdma_mem_free(busdma, md);
435 		break;
436 	case PROTO_IOC_BUSDMA_MD_CREATE:
437 		tag = proto_busdma_tag_lookup(busdma, ioc->u.md.tag);
438 		if (tag == NULL) {
439 			error = EINVAL;
440 			break;
441 		}
442 		error = proto_busdma_md_create(busdma, tag, ioc);
443 		break;
444 	case PROTO_IOC_BUSDMA_MD_DESTROY:
445 		md = proto_busdma_md_lookup(busdma, ioc->key);
446 		if (md == NULL) {
447 			error = EINVAL;
448 			break;
449 		}
450 		error = proto_busdma_md_destroy(busdma, md);
451 		break;
452 	case PROTO_IOC_BUSDMA_MD_LOAD:
453 		md = proto_busdma_md_lookup(busdma, ioc->key);
454 		if (md == NULL) {
455 			error = EINVAL;
456 			break;
457 		}
458 		error = proto_busdma_md_load(busdma, md, ioc, td);
459 		break;
460 	case PROTO_IOC_BUSDMA_MD_UNLOAD:
461 		md = proto_busdma_md_lookup(busdma, ioc->key);
462 		if (md == NULL) {
463 			error = EINVAL;
464 			break;
465 		}
466 		error = proto_busdma_md_unload(busdma, md);
467 		break;
468 	case PROTO_IOC_BUSDMA_SYNC:
469 		md = proto_busdma_md_lookup(busdma, ioc->key);
470 		if (md == NULL) {
471 			error = EINVAL;
472 			break;
473 		}
474 		error = proto_busdma_sync(busdma, md, ioc);
475 		break;
476 	default:
477 		error = EINVAL;
478 		break;
479 	}
480 
481 	sx_xunlock(&busdma->sxlck);
482 
483 	return (error);
484 }
485 
486 int
487 proto_busdma_mmap_allowed(struct proto_busdma *busdma, vm_paddr_t physaddr)
488 {
489 	struct proto_md *md;
490 	int result;
491 
492 	sx_xlock(&busdma->sxlck);
493 
494 	result = 0;
495 	LIST_FOREACH(md, &busdma->mds, mds) {
496 		if (physaddr >= trunc_page(md->physaddr) &&
497 		    physaddr <= trunc_page(md->physaddr + md->tag->maxsz)) {
498 			result = 1;
499 			break;
500 		}
501 	}
502 
503 	sx_xunlock(&busdma->sxlck);
504 
505 	return (result);
506 }
507