1 /*-
2 * Copyright (c) 2004 Olivier Houchard
3 * Copyright (c) 2002 Peter Grehan
4 * Copyright (c) 1997, 1998 Justin T. Gibbs.
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 * without modification, immediately at the beginning of the file.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * From i386/busdma_machdep.c,v 1.26 2002/04/19 22:58:09 alfred
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: releng/9.0/sys/arm/arm/busdma_machdep.c 205028 2010-03-11 21:16:54Z raj $");
33
34 /*
35 * ARM bus dma support routines
36 */
37
38 #define _ARM32_BUS_DMA_PRIVATE
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/malloc.h>
42 #include <sys/bus.h>
43 #include <sys/interrupt.h>
44 #include <sys/lock.h>
45 #include <sys/proc.h>
46 #include <sys/mutex.h>
47 #include <sys/mbuf.h>
48 #include <sys/uio.h>
49 #include <sys/ktr.h>
50 #include <sys/kernel.h>
51 #include <sys/sysctl.h>
52
53 #include <vm/vm.h>
54 #include <vm/vm_page.h>
55 #include <vm/vm_map.h>
56
57 #include <machine/atomic.h>
58 #include <machine/bus.h>
59 #include <machine/cpufunc.h>
60 #include <machine/md_var.h>
61
62 #define MAX_BPAGES 64
63 #define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3
64 #define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
65
66 struct bounce_zone;
67
68 struct bus_dma_tag {
69 bus_dma_tag_t parent;
70 bus_size_t alignment;
71 bus_size_t boundary;
72 bus_addr_t lowaddr;
73 bus_addr_t highaddr;
74 bus_dma_filter_t *filter;
75 void *filterarg;
76 bus_size_t maxsize;
77 u_int nsegments;
78 bus_size_t maxsegsz;
79 int flags;
80 int ref_count;
81 int map_count;
82 bus_dma_lock_t *lockfunc;
83 void *lockfuncarg;
84 /*
85 * DMA range for this tag. If the page doesn't fall within
86 * one of these ranges, an error is returned. The caller
87 * may then decide what to do with the transfer. If the
88 * range pointer is NULL, it is ignored.
89 */
90 struct arm32_dma_range *ranges;
91 int _nranges;
92 struct bounce_zone *bounce_zone;
93 };
94
95 struct bounce_page {
96 vm_offset_t vaddr; /* kva of bounce buffer */
97 vm_offset_t vaddr_nocache; /* kva of bounce buffer uncached */
98 bus_addr_t busaddr; /* Physical address */
99 vm_offset_t datavaddr; /* kva of client data */
100 bus_size_t datacount; /* client data count */
101 STAILQ_ENTRY(bounce_page) links;
102 };
103
104 int busdma_swi_pending;
105
106 struct bounce_zone {
107 STAILQ_ENTRY(bounce_zone) links;
108 STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
109 int total_bpages;
110 int free_bpages;
111 int reserved_bpages;
112 int active_bpages;
113 int total_bounced;
114 int total_deferred;
115 int map_count;
116 bus_size_t alignment;
117 bus_addr_t lowaddr;
118 char zoneid[8];
119 char lowaddrid[20];
120 struct sysctl_ctx_list sysctl_tree;
121 struct sysctl_oid *sysctl_tree_top;
122 };
123
124 static struct mtx bounce_lock;
125 static int total_bpages;
126 static int busdma_zonecount;
127 static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
128
129 SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0, "Busdma parameters");
130 SYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bpages, 0,
131 "Total bounce pages");
132
133 #define DMAMAP_LINEAR 0x1
134 #define DMAMAP_MBUF 0x2
135 #define DMAMAP_UIO 0x4
136 #define DMAMAP_ALLOCATED 0x10
137 #define DMAMAP_TYPE_MASK (DMAMAP_LINEAR|DMAMAP_MBUF|DMAMAP_UIO)
138 #define DMAMAP_COHERENT 0x8
139 struct bus_dmamap {
140 struct bp_list bpages;
141 int pagesneeded;
142 int pagesreserved;
143 bus_dma_tag_t dmat;
144 int flags;
145 void *buffer;
146 void *origbuffer;
147 void *allocbuffer;
148 TAILQ_ENTRY(bus_dmamap) freelist;
149 int len;
150 STAILQ_ENTRY(bus_dmamap) links;
151 bus_dmamap_callback_t *callback;
152 void *callback_arg;
153
154 };
155
156 static STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist;
157 static STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist;
158
159 static TAILQ_HEAD(,bus_dmamap) dmamap_freelist =
160 TAILQ_HEAD_INITIALIZER(dmamap_freelist);
161
162 #define BUSDMA_STATIC_MAPS 500
163 static struct bus_dmamap map_pool[BUSDMA_STATIC_MAPS];
164
165 static struct mtx busdma_mtx;
166
167 MTX_SYSINIT(busdma_mtx, &busdma_mtx, "busdma lock", MTX_DEF);
168
169 static void init_bounce_pages(void *dummy);
170 static int alloc_bounce_zone(bus_dma_tag_t dmat);
171 static int alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages);
172 static int reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map,
173 int commit);
174 static bus_addr_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map,
175 vm_offset_t vaddr, bus_size_t size);
176 static void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage);
177
178 /* Default tag, as most drivers provide no parent tag. */
179 bus_dma_tag_t arm_root_dma_tag;
180
181 /*
182 * Return true if a match is made.
183 *
184 * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
185 *
186 * If paddr is within the bounds of the dma tag then call the filter callback
187 * to check for a match, if there is no filter callback then assume a match.
188 */
189 static int
190 run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
191 {
192 int retval;
193
194 retval = 0;
195
196 do {
197 if (((paddr > dmat->lowaddr && paddr <= dmat->highaddr)
198 || ((paddr & (dmat->alignment - 1)) != 0))
199 && (dmat->filter == NULL
200 || (*dmat->filter)(dmat->filterarg, paddr) != 0))
201 retval = 1;
202
203 dmat = dmat->parent;
204 } while (retval == 0 && dmat != NULL);
205 return (retval);
206 }
207
208 static void
209 arm_dmamap_freelist_init(void *dummy)
210 {
211 int i;
212
213 for (i = 0; i < BUSDMA_STATIC_MAPS; i++)
214 TAILQ_INSERT_HEAD(&dmamap_freelist, &map_pool[i], freelist);
215 }
216
217 SYSINIT(busdma, SI_SUB_VM, SI_ORDER_ANY, arm_dmamap_freelist_init, NULL);
218
219 /*
220 * Check to see if the specified page is in an allowed DMA range.
221 */
222
223 static __inline int
224 bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs,
225 bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap,
226 int flags, vm_offset_t *lastaddrp, int *segp);
227
228 static __inline int
229 _bus_dma_can_bounce(vm_offset_t lowaddr, vm_offset_t highaddr)
230 {
231 int i;
232 for (i = 0; phys_avail[i] && phys_avail[i + 1]; i += 2) {
233 if ((lowaddr >= phys_avail[i] && lowaddr <= phys_avail[i + 1])
234 || (lowaddr < phys_avail[i] &&
235 highaddr > phys_avail[i]))
236 return (1);
237 }
238 return (0);
239 }
240
241 static __inline struct arm32_dma_range *
242 _bus_dma_inrange(struct arm32_dma_range *ranges, int nranges,
243 bus_addr_t curaddr)
244 {
245 struct arm32_dma_range *dr;
246 int i;
247
248 for (i = 0, dr = ranges; i < nranges; i++, dr++) {
249 if (curaddr >= dr->dr_sysbase &&
250 round_page(curaddr) <= (dr->dr_sysbase + dr->dr_len))
251 return (dr);
252 }
253
254 return (NULL);
255 }
256 /*
257 * Convenience function for manipulating driver locks from busdma (during
258 * busdma_swi, for example). Drivers that don't provide their own locks
259 * should specify &Giant to dmat->lockfuncarg. Drivers that use their own
260 * non-mutex locking scheme don't have to use this at all.
261 */
262 void
263 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
264 {
265 struct mtx *dmtx;
266
267 dmtx = (struct mtx *)arg;
268 switch (op) {
269 case BUS_DMA_LOCK:
270 mtx_lock(dmtx);
271 break;
272 case BUS_DMA_UNLOCK:
273 mtx_unlock(dmtx);
274 break;
275 default:
276 panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
277 }
278 }
279
280 /*
281 * dflt_lock should never get called. It gets put into the dma tag when
282 * lockfunc == NULL, which is only valid if the maps that are associated
283 * with the tag are meant to never be defered.
284 * XXX Should have a way to identify which driver is responsible here.
285 */
286 static void
287 dflt_lock(void *arg, bus_dma_lock_op_t op)
288 {
289 #ifdef INVARIANTS
290 panic("driver error: busdma dflt_lock called");
291 #else
292 printf("DRIVER_ERROR: busdma dflt_lock called\n");
293 #endif
294 }
295
296 static __inline bus_dmamap_t
297 _busdma_alloc_dmamap(void)
298 {
299 bus_dmamap_t map;
300
301 mtx_lock(&busdma_mtx);
302 map = TAILQ_FIRST(&dmamap_freelist);
303 if (map)
304 TAILQ_REMOVE(&dmamap_freelist, map, freelist);
305 mtx_unlock(&busdma_mtx);
306 if (!map) {
307 map = malloc(sizeof(*map), M_DEVBUF, M_NOWAIT | M_ZERO);
308 if (map)
309 map->flags = DMAMAP_ALLOCATED;
310 } else
311 map->flags = 0;
312 STAILQ_INIT(&map->bpages);
313 return (map);
314 }
315
316 static __inline void
317 _busdma_free_dmamap(bus_dmamap_t map)
318 {
319 if (map->flags & DMAMAP_ALLOCATED)
320 free(map, M_DEVBUF);
321 else {
322 mtx_lock(&busdma_mtx);
323 TAILQ_INSERT_HEAD(&dmamap_freelist, map, freelist);
324 mtx_unlock(&busdma_mtx);
325 }
326 }
327
328 /*
329 * Allocate a device specific dma_tag.
330 */
331 #define SEG_NB 1024
332
333 int
334 bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
335 bus_size_t boundary, bus_addr_t lowaddr,
336 bus_addr_t highaddr, bus_dma_filter_t *filter,
337 void *filterarg, bus_size_t maxsize, int nsegments,
338 bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
339 void *lockfuncarg, bus_dma_tag_t *dmat)
340 {
341 bus_dma_tag_t newtag;
342 int error = 0;
343 /* Return a NULL tag on failure */
344 *dmat = NULL;
345 if (!parent)
346 parent = arm_root_dma_tag;
347
348 newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, M_NOWAIT);
349 if (newtag == NULL) {
350 CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
351 __func__, newtag, 0, error);
352 return (ENOMEM);
353 }
354
355 newtag->parent = parent;
356 newtag->alignment = alignment;
357 newtag->boundary = boundary;
358 newtag->lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1);
359 newtag->highaddr = trunc_page((vm_offset_t)highaddr) + (PAGE_SIZE - 1);
360 newtag->filter = filter;
361 newtag->filterarg = filterarg;
362 newtag->maxsize = maxsize;
363 newtag->nsegments = nsegments;
364 newtag->maxsegsz = maxsegsz;
365 newtag->flags = flags;
366 newtag->ref_count = 1; /* Count ourself */
367 newtag->map_count = 0;
368 newtag->ranges = bus_dma_get_range();
369 newtag->_nranges = bus_dma_get_range_nb();
370 if (lockfunc != NULL) {
371 newtag->lockfunc = lockfunc;
372 newtag->lockfuncarg = lockfuncarg;
373 } else {
374 newtag->lockfunc = dflt_lock;
375 newtag->lockfuncarg = NULL;
376 }
377 /*
378 * Take into account any restrictions imposed by our parent tag
379 */
380 if (parent != NULL) {
381 newtag->lowaddr = min(parent->lowaddr, newtag->lowaddr);
382 newtag->highaddr = max(parent->highaddr, newtag->highaddr);
383 if (newtag->boundary == 0)
384 newtag->boundary = parent->boundary;
385 else if (parent->boundary != 0)
386 newtag->boundary = min(parent->boundary,
387 newtag->boundary);
388 if ((newtag->filter != NULL) ||
389 ((parent->flags & BUS_DMA_COULD_BOUNCE) != 0))
390 newtag->flags |= BUS_DMA_COULD_BOUNCE;
391 if (newtag->filter == NULL) {
392 /*
393 * Short circuit looking at our parent directly
394 * since we have encapsulated all of its information
395 */
396 newtag->filter = parent->filter;
397 newtag->filterarg = parent->filterarg;
398 newtag->parent = parent->parent;
399 }
400 if (newtag->parent != NULL)
401 atomic_add_int(&parent->ref_count, 1);
402 }
403 if (_bus_dma_can_bounce(newtag->lowaddr, newtag->highaddr)
404 || newtag->alignment > 1)
405 newtag->flags |= BUS_DMA_COULD_BOUNCE;
406
407 if (((newtag->flags & BUS_DMA_COULD_BOUNCE) != 0) &&
408 (flags & BUS_DMA_ALLOCNOW) != 0) {
409 struct bounce_zone *bz;
410
411 /* Must bounce */
412
413 if ((error = alloc_bounce_zone(newtag)) != 0) {
414 free(newtag, M_DEVBUF);
415 return (error);
416 }
417 bz = newtag->bounce_zone;
418
419 if (ptoa(bz->total_bpages) < maxsize) {
420 int pages;
421
422 pages = atop(maxsize) - bz->total_bpages;
423
424 /* Add pages to our bounce pool */
425 if (alloc_bounce_pages(newtag, pages) < pages)
426 error = ENOMEM;
427 }
428 /* Performed initial allocation */
429 newtag->flags |= BUS_DMA_MIN_ALLOC_COMP;
430 } else
431 newtag->bounce_zone = NULL;
432 if (error != 0)
433 free(newtag, M_DEVBUF);
434 else
435 *dmat = newtag;
436 CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
437 __func__, newtag, (newtag != NULL ? newtag->flags : 0), error);
438
439 return (error);
440 }
441
442 int
443 bus_dma_tag_destroy(bus_dma_tag_t dmat)
444 {
445 #ifdef KTR
446 bus_dma_tag_t dmat_copy = dmat;
447 #endif
448
449 if (dmat != NULL) {
450
451 if (dmat->map_count != 0)
452 return (EBUSY);
453
454 while (dmat != NULL) {
455 bus_dma_tag_t parent;
456
457 parent = dmat->parent;
458 atomic_subtract_int(&dmat->ref_count, 1);
459 if (dmat->ref_count == 0) {
460 free(dmat, M_DEVBUF);
461 /*
462 * Last reference count, so
463 * release our reference
464 * count on our parent.
465 */
466 dmat = parent;
467 } else
468 dmat = NULL;
469 }
470 }
471 CTR2(KTR_BUSDMA, "%s tag %p", __func__, dmat_copy);
472
473 return (0);
474 }
475
476 #include <sys/kdb.h>
477 /*
478 * Allocate a handle for mapping from kva/uva/physical
479 * address space into bus device space.
480 */
481 int
482 bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
483 {
484 bus_dmamap_t newmap;
485 int error = 0;
486
487 newmap = _busdma_alloc_dmamap();
488 if (newmap == NULL) {
489 CTR3(KTR_BUSDMA, "%s: tag %p error %d", __func__, dmat, ENOMEM);
490 return (ENOMEM);
491 }
492 *mapp = newmap;
493 newmap->dmat = dmat;
494 newmap->allocbuffer = NULL;
495 dmat->map_count++;
496
497 /*
498 * Bouncing might be required if the driver asks for an active
499 * exclusion region, a data alignment that is stricter than 1, and/or
500 * an active address boundary.
501 */
502 if (dmat->flags & BUS_DMA_COULD_BOUNCE) {
503
504 /* Must bounce */
505 struct bounce_zone *bz;
506 int maxpages;
507
508 if (dmat->bounce_zone == NULL) {
509 if ((error = alloc_bounce_zone(dmat)) != 0) {
510 _busdma_free_dmamap(newmap);
511 *mapp = NULL;
512 return (error);
513 }
514 }
515 bz = dmat->bounce_zone;
516
517 /* Initialize the new map */
518 STAILQ_INIT(&((*mapp)->bpages));
519
520 /*
521 * Attempt to add pages to our pool on a per-instance
522 * basis up to a sane limit.
523 */
524 maxpages = MAX_BPAGES;
525 if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0
526 || (bz->map_count > 0 && bz->total_bpages < maxpages)) {
527 int pages;
528
529 pages = MAX(atop(dmat->maxsize), 1);
530 pages = MIN(maxpages - bz->total_bpages, pages);
531 pages = MAX(pages, 1);
532 if (alloc_bounce_pages(dmat, pages) < pages)
533 error = ENOMEM;
534
535 if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) {
536 if (error == 0)
537 dmat->flags |= BUS_DMA_MIN_ALLOC_COMP;
538 } else {
539 error = 0;
540 }
541 }
542 bz->map_count++;
543 }
544 CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
545 __func__, dmat, dmat->flags, error);
546
547 return (0);
548 }
549
550 /*
551 * Destroy a handle for mapping from kva/uva/physical
552 * address space into bus device space.
553 */
554 int
555 bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
556 {
557
558 if (STAILQ_FIRST(&map->bpages) != NULL) {
559 CTR3(KTR_BUSDMA, "%s: tag %p error %d",
560 __func__, dmat, EBUSY);
561 return (EBUSY);
562 }
563 _busdma_free_dmamap(map);
564 if (dmat->bounce_zone)
565 dmat->bounce_zone->map_count--;
566 dmat->map_count--;
567 CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat);
568 return (0);
569 }
570
571 /*
572 * Allocate a piece of memory that can be efficiently mapped into
573 * bus device space based on the constraints lited in the dma tag.
574 * A dmamap to for use with dmamap_load is also allocated.
575 */
576 int
577 bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
578 bus_dmamap_t *mapp)
579 {
580 bus_dmamap_t newmap = NULL;
581
582 int mflags;
583
584 if (flags & BUS_DMA_NOWAIT)
585 mflags = M_NOWAIT;
586 else
587 mflags = M_WAITOK;
588 if (flags & BUS_DMA_ZERO)
589 mflags |= M_ZERO;
590
591 newmap = _busdma_alloc_dmamap();
592 if (newmap == NULL) {
593 CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
594 __func__, dmat, dmat->flags, ENOMEM);
595 return (ENOMEM);
596 }
597 dmat->map_count++;
598 *mapp = newmap;
599 newmap->dmat = dmat;
600
601 if (dmat->maxsize <= PAGE_SIZE &&
602 (dmat->alignment < dmat->maxsize) &&
603 !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr)) {
604 *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags);
605 } else {
606 /*
607 * XXX Use Contigmalloc until it is merged into this facility
608 * and handles multi-seg allocations. Nobody is doing
609 * multi-seg allocations yet though.
610 */
611 *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags,
612 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul,
613 dmat->boundary);
614 }
615 if (*vaddr == NULL) {
616 if (newmap != NULL) {
617 _busdma_free_dmamap(newmap);
618 dmat->map_count--;
619 }
620 *mapp = NULL;
621 return (ENOMEM);
622 }
623 if (flags & BUS_DMA_COHERENT) {
624 void *tmpaddr = arm_remap_nocache(
625 (void *)((vm_offset_t)*vaddr &~ PAGE_MASK),
626 dmat->maxsize + ((vm_offset_t)*vaddr & PAGE_MASK));
627
628 if (tmpaddr) {
629 tmpaddr = (void *)((vm_offset_t)(tmpaddr) +
630 ((vm_offset_t)*vaddr & PAGE_MASK));
631 newmap->origbuffer = *vaddr;
632 newmap->allocbuffer = tmpaddr;
633 *vaddr = tmpaddr;
634 } else
635 newmap->origbuffer = newmap->allocbuffer = NULL;
636 } else
637 newmap->origbuffer = newmap->allocbuffer = NULL;
638 return (0);
639 }
640
641 /*
642 * Free a piece of memory and it's allocated dmamap, that was allocated
643 * via bus_dmamem_alloc. Make the same choice for free/contigfree.
644 */
645 void
646 bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
647 {
648 if (map->allocbuffer) {
649 KASSERT(map->allocbuffer == vaddr,
650 ("Trying to freeing the wrong DMA buffer"));
651 vaddr = map->origbuffer;
652 arm_unmap_nocache(map->allocbuffer,
653 dmat->maxsize + ((vm_offset_t)vaddr & PAGE_MASK));
654 }
655 if (dmat->maxsize <= PAGE_SIZE &&
656 dmat->alignment < dmat->maxsize &&
657 !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr))
658 free(vaddr, M_DEVBUF);
659 else {
660 contigfree(vaddr, dmat->maxsize, M_DEVBUF);
661 }
662 dmat->map_count--;
663 _busdma_free_dmamap(map);
664 CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags);
665 }
666
667 static int
668 _bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, pmap_t pmap,
669 void *buf, bus_size_t buflen, int flags)
670 {
671 vm_offset_t vaddr;
672 vm_offset_t vendaddr;
673 bus_addr_t paddr;
674
675 if ((map->pagesneeded == 0)) {
676 CTR3(KTR_BUSDMA, "lowaddr= %d, boundary= %d, alignment= %d",
677 dmat->lowaddr, dmat->boundary, dmat->alignment);
678 CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d",
679 map, map->pagesneeded);
680 /*
681 * Count the number of bounce pages
682 * needed in order to complete this transfer
683 */
684 vaddr = trunc_page((vm_offset_t)buf);
685 vendaddr = (vm_offset_t)buf + buflen;
686
687 while (vaddr < vendaddr) {
688 if (__predict_true(pmap == pmap_kernel()))
689 paddr = pmap_kextract(vaddr);
690 else
691 paddr = pmap_extract(pmap, vaddr);
692 if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) &&
693 run_filter(dmat, paddr) != 0)
694 map->pagesneeded++;
695 vaddr += PAGE_SIZE;
696 }
697 CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded);
698 }
699
700 /* Reserve Necessary Bounce Pages */
701 if (map->pagesneeded != 0) {
702 mtx_lock(&bounce_lock);
703 if (flags & BUS_DMA_NOWAIT) {
704 if (reserve_bounce_pages(dmat, map, 0) != 0) {
705 mtx_unlock(&bounce_lock);
706 return (ENOMEM);
707 }
708 } else {
709 if (reserve_bounce_pages(dmat, map, 1) != 0) {
710 /* Queue us for resources */
711 STAILQ_INSERT_TAIL(&bounce_map_waitinglist,
712 map, links);
713 mtx_unlock(&bounce_lock);
714 return (EINPROGRESS);
715 }
716 }
717 mtx_unlock(&bounce_lock);
718 }
719
720 return (0);
721 }
722
723 /*
724 * Utility function to load a linear buffer. lastaddrp holds state
725 * between invocations (for multiple-buffer loads). segp contains
726 * the starting segment on entrance, and the ending segment on exit.
727 * first indicates if this is the first invocation of this function.
728 */
729 static __inline int
730 bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs,
731 bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap,
732 int flags, vm_offset_t *lastaddrp, int *segp)
733 {
734 bus_size_t sgsize;
735 bus_addr_t curaddr, lastaddr, baddr, bmask;
736 vm_offset_t vaddr = (vm_offset_t)buf;
737 int seg;
738 int error = 0;
739 pd_entry_t *pde;
740 pt_entry_t pte;
741 pt_entry_t *ptep;
742
743 lastaddr = *lastaddrp;
744 bmask = ~(dmat->boundary - 1);
745
746 if ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) {
747 error = _bus_dmamap_count_pages(dmat, map, pmap, buf, buflen,
748 flags);
749 if (error)
750 return (error);
751 }
752 CTR3(KTR_BUSDMA, "lowaddr= %d boundary= %d, "
753 "alignment= %d", dmat->lowaddr, dmat->boundary, dmat->alignment);
754
755 for (seg = *segp; buflen > 0 ; ) {
756 /*
757 * Get the physical address for this segment.
758 *
759 * XXX Don't support checking for coherent mappings
760 * XXX in user address space.
761 */
762 if (__predict_true(pmap == pmap_kernel())) {
763 if (pmap_get_pde_pte(pmap, vaddr, &pde, &ptep) == FALSE)
764 return (EFAULT);
765
766 if (__predict_false(pmap_pde_section(pde))) {
767 if (*pde & L1_S_SUPERSEC)
768 curaddr = (*pde & L1_SUP_FRAME) |
769 (vaddr & L1_SUP_OFFSET);
770 else
771 curaddr = (*pde & L1_S_FRAME) |
772 (vaddr & L1_S_OFFSET);
773 if (*pde & L1_S_CACHE_MASK) {
774 map->flags &=
775 ~DMAMAP_COHERENT;
776 }
777 } else {
778 pte = *ptep;
779 KASSERT((pte & L2_TYPE_MASK) != L2_TYPE_INV,
780 ("INV type"));
781 if (__predict_false((pte & L2_TYPE_MASK)
782 == L2_TYPE_L)) {
783 curaddr = (pte & L2_L_FRAME) |
784 (vaddr & L2_L_OFFSET);
785 if (pte & L2_L_CACHE_MASK) {
786 map->flags &=
787 ~DMAMAP_COHERENT;
788
789 }
790 } else {
791 curaddr = (pte & L2_S_FRAME) |
792 (vaddr & L2_S_OFFSET);
793 if (pte & L2_S_CACHE_MASK) {
794 map->flags &=
795 ~DMAMAP_COHERENT;
796 }
797 }
798 }
799 } else {
800 curaddr = pmap_extract(pmap, vaddr);
801 map->flags &= ~DMAMAP_COHERENT;
802 }
803
804 /*
805 * Compute the segment size, and adjust counts.
806 */
807 sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK);
808 if (sgsize > dmat->maxsegsz)
809 sgsize = dmat->maxsegsz;
810 if (buflen < sgsize)
811 sgsize = buflen;
812
813 /*
814 * Make sure we don't cross any boundaries.
815 */
816 if (dmat->boundary > 0) {
817 baddr = (curaddr + dmat->boundary) & bmask;
818 if (sgsize > (baddr - curaddr))
819 sgsize = (baddr - curaddr);
820 }
821 if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) &&
822 map->pagesneeded != 0 && run_filter(dmat, curaddr))
823 curaddr = add_bounce_page(dmat, map, vaddr, sgsize);
824
825 if (dmat->ranges) {
826 struct arm32_dma_range *dr;
827
828 dr = _bus_dma_inrange(dmat->ranges, dmat->_nranges,
829 curaddr);
830 if (dr == NULL)
831 return (EINVAL);
832 /*
833 * In a valid DMA range. Translate the physical
834 * memory address to an address in the DMA window.
835 */
836 curaddr = (curaddr - dr->dr_sysbase) + dr->dr_busbase;
837
838 }
839
840 /*
841 * Insert chunk into a segment, coalescing with
842 * the previous segment if possible.
843 */
844 if (seg >= 0 && curaddr == lastaddr &&
845 (segs[seg].ds_len + sgsize) <= dmat->maxsegsz &&
846 (dmat->boundary == 0 ||
847 (segs[seg].ds_addr & bmask) ==
848 (curaddr & bmask))) {
849 segs[seg].ds_len += sgsize;
850 goto segdone;
851 } else {
852 if (++seg >= dmat->nsegments)
853 break;
854 segs[seg].ds_addr = curaddr;
855 segs[seg].ds_len = sgsize;
856 }
857 if (error)
858 break;
859 segdone:
860 lastaddr = curaddr + sgsize;
861 vaddr += sgsize;
862 buflen -= sgsize;
863 }
864
865 *segp = seg;
866 *lastaddrp = lastaddr;
867
868 /*
869 * Did we fit?
870 */
871 if (buflen != 0)
872 error = EFBIG; /* XXX better return value here? */
873 return (error);
874 }
875
876 /*
877 * Map the buffer buf into bus space using the dmamap map.
878 */
879 int
880 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
881 bus_size_t buflen, bus_dmamap_callback_t *callback,
882 void *callback_arg, int flags)
883 {
884 vm_offset_t lastaddr = 0;
885 int error, nsegs = -1;
886 #ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT
887 bus_dma_segment_t dm_segments[dmat->nsegments];
888 #else
889 bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS];
890 #endif
891
892 KASSERT(dmat != NULL, ("dmatag is NULL"));
893 KASSERT(map != NULL, ("dmamap is NULL"));
894 map->callback = callback;
895 map->callback_arg = callback_arg;
896 map->flags &= ~DMAMAP_TYPE_MASK;
897 map->flags |= DMAMAP_LINEAR|DMAMAP_COHERENT;
898 map->buffer = buf;
899 map->len = buflen;
900 error = bus_dmamap_load_buffer(dmat,
901 dm_segments, map, buf, buflen, kernel_pmap,
902 flags, &lastaddr, &nsegs);
903 if (error == EINPROGRESS)
904 return (error);
905 if (error)
906 (*callback)(callback_arg, NULL, 0, error);
907 else
908 (*callback)(callback_arg, dm_segments, nsegs + 1, error);
909
910 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
911 __func__, dmat, dmat->flags, nsegs + 1, error);
912
913 return (error);
914 }
915
916 /*
917 * Like bus_dmamap_load(), but for mbufs.
918 */
919 int
920 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
921 bus_dmamap_callback2_t *callback, void *callback_arg,
922 int flags)
923 {
924 #ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT
925 bus_dma_segment_t dm_segments[dmat->nsegments];
926 #else
927 bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS];
928 #endif
929 int nsegs = -1, error = 0;
930
931 M_ASSERTPKTHDR(m0);
932
933 map->flags &= ~DMAMAP_TYPE_MASK;
934 map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT;
935 map->buffer = m0;
936 map->len = 0;
937 if (m0->m_pkthdr.len <= dmat->maxsize) {
938 vm_offset_t lastaddr = 0;
939 struct mbuf *m;
940
941 for (m = m0; m != NULL && error == 0; m = m->m_next) {
942 if (m->m_len > 0) {
943 error = bus_dmamap_load_buffer(dmat,
944 dm_segments, map, m->m_data, m->m_len,
945 pmap_kernel(), flags, &lastaddr, &nsegs);
946 map->len += m->m_len;
947 }
948 }
949 } else {
950 error = EINVAL;
951 }
952
953 if (error) {
954 /*
955 * force "no valid mappings" on error in callback.
956 */
957 (*callback)(callback_arg, dm_segments, 0, 0, error);
958 } else {
959 (*callback)(callback_arg, dm_segments, nsegs + 1,
960 m0->m_pkthdr.len, error);
961 }
962 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
963 __func__, dmat, dmat->flags, error, nsegs + 1);
964
965 return (error);
966 }
967
968 int
969 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
970 struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs,
971 int flags)
972 {
973 int error = 0;
974 M_ASSERTPKTHDR(m0);
975
976 flags |= BUS_DMA_NOWAIT;
977 *nsegs = -1;
978 map->flags &= ~DMAMAP_TYPE_MASK;
979 map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT;
980 map->buffer = m0;
981 map->len = 0;
982 if (m0->m_pkthdr.len <= dmat->maxsize) {
983 vm_offset_t lastaddr = 0;
984 struct mbuf *m;
985
986 for (m = m0; m != NULL && error == 0; m = m->m_next) {
987 if (m->m_len > 0) {
988 error = bus_dmamap_load_buffer(dmat, segs, map,
989 m->m_data, m->m_len,
990 pmap_kernel(), flags, &lastaddr,
991 nsegs);
992 map->len += m->m_len;
993 }
994 }
995 } else {
996 error = EINVAL;
997 }
998
999 /* XXX FIXME: Having to increment nsegs is really annoying */
1000 ++*nsegs;
1001 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
1002 __func__, dmat, dmat->flags, error, *nsegs);
1003 return (error);
1004 }
1005
1006 /*
1007 * Like bus_dmamap_load(), but for uios.
1008 */
1009 int
1010 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
1011 bus_dmamap_callback2_t *callback, void *callback_arg,
1012 int flags)
1013 {
1014 vm_offset_t lastaddr = 0;
1015 #ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT
1016 bus_dma_segment_t dm_segments[dmat->nsegments];
1017 #else
1018 bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS];
1019 #endif
1020 int nsegs, i, error;
1021 bus_size_t resid;
1022 struct iovec *iov;
1023 struct pmap *pmap;
1024
1025 resid = uio->uio_resid;
1026 iov = uio->uio_iov;
1027 map->flags &= ~DMAMAP_TYPE_MASK;
1028 map->flags |= DMAMAP_UIO|DMAMAP_COHERENT;
1029 map->buffer = uio;
1030 map->len = 0;
1031
1032 if (uio->uio_segflg == UIO_USERSPACE) {
1033 KASSERT(uio->uio_td != NULL,
1034 ("bus_dmamap_load_uio: USERSPACE but no proc"));
1035 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
1036 } else
1037 pmap = kernel_pmap;
1038
1039 error = 0;
1040 nsegs = -1;
1041 for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
1042 /*
1043 * Now at the first iovec to load. Load each iovec
1044 * until we have exhausted the residual count.
1045 */
1046 bus_size_t minlen =
1047 resid < iov[i].iov_len ? resid : iov[i].iov_len;
1048 caddr_t addr = (caddr_t) iov[i].iov_base;
1049
1050 if (minlen > 0) {
1051 error = bus_dmamap_load_buffer(dmat, dm_segments, map,
1052 addr, minlen, pmap, flags, &lastaddr, &nsegs);
1053
1054 map->len += minlen;
1055 resid -= minlen;
1056 }
1057 }
1058
1059 if (error) {
1060 /*
1061 * force "no valid mappings" on error in callback.
1062 */
1063 (*callback)(callback_arg, dm_segments, 0, 0, error);
1064 } else {
1065 (*callback)(callback_arg, dm_segments, nsegs+1,
1066 uio->uio_resid, error);
1067 }
1068
1069 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
1070 __func__, dmat, dmat->flags, error, nsegs + 1);
1071 return (error);
1072 }
1073
1074 /*
1075 * Release the mapping held by map.
1076 */
1077 void
1078 _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
1079 {
1080 struct bounce_page *bpage;
1081
1082 map->flags &= ~DMAMAP_TYPE_MASK;
1083 while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
1084 STAILQ_REMOVE_HEAD(&map->bpages, links);
1085 free_bounce_page(dmat, bpage);
1086 }
1087 return;
1088 }
1089
1090 static void
1091 bus_dmamap_sync_buf(void *buf, int len, bus_dmasync_op_t op)
1092 {
1093 char _tmp_cl[arm_dcache_align], _tmp_clend[arm_dcache_align];
1094
1095 if ((op & BUS_DMASYNC_PREWRITE) && !(op & BUS_DMASYNC_PREREAD)) {
1096 cpu_dcache_wb_range((vm_offset_t)buf, len);
1097 cpu_l2cache_wb_range((vm_offset_t)buf, len);
1098 }
1099 if (op & BUS_DMASYNC_PREREAD) {
1100 if (!(op & BUS_DMASYNC_PREWRITE) &&
1101 ((((vm_offset_t)(buf) | len) & arm_dcache_align_mask) == 0)) {
1102 cpu_dcache_inv_range((vm_offset_t)buf, len);
1103 cpu_l2cache_inv_range((vm_offset_t)buf, len);
1104 } else {
1105 cpu_dcache_wbinv_range((vm_offset_t)buf, len);
1106 cpu_l2cache_wbinv_range((vm_offset_t)buf, len);
1107 }
1108 }
1109 if (op & BUS_DMASYNC_POSTREAD) {
1110 if ((vm_offset_t)buf & arm_dcache_align_mask) {
1111 memcpy(_tmp_cl, (void *)((vm_offset_t)buf & ~
1112 arm_dcache_align_mask),
1113 (vm_offset_t)buf & arm_dcache_align_mask);
1114 }
1115 if (((vm_offset_t)buf + len) & arm_dcache_align_mask) {
1116 memcpy(_tmp_clend, (void *)((vm_offset_t)buf + len),
1117 arm_dcache_align - (((vm_offset_t)(buf) + len) &
1118 arm_dcache_align_mask));
1119 }
1120 cpu_dcache_inv_range((vm_offset_t)buf, len);
1121 cpu_l2cache_inv_range((vm_offset_t)buf, len);
1122
1123 if ((vm_offset_t)buf & arm_dcache_align_mask)
1124 memcpy((void *)((vm_offset_t)buf &
1125 ~arm_dcache_align_mask), _tmp_cl,
1126 (vm_offset_t)buf & arm_dcache_align_mask);
1127 if (((vm_offset_t)buf + len) & arm_dcache_align_mask)
1128 memcpy((void *)((vm_offset_t)buf + len), _tmp_clend,
1129 arm_dcache_align - (((vm_offset_t)(buf) + len) &
1130 arm_dcache_align_mask));
1131 }
1132 }
1133
1134 static void
1135 _bus_dmamap_sync_bp(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
1136 {
1137 struct bounce_page *bpage;
1138
1139 STAILQ_FOREACH(bpage, &map->bpages, links) {
1140 if (op & BUS_DMASYNC_PREWRITE) {
1141 bcopy((void *)bpage->datavaddr,
1142 (void *)(bpage->vaddr_nocache != 0 ?
1143 bpage->vaddr_nocache : bpage->vaddr),
1144 bpage->datacount);
1145 if (bpage->vaddr_nocache == 0) {
1146 cpu_dcache_wb_range(bpage->vaddr,
1147 bpage->datacount);
1148 cpu_l2cache_wb_range(bpage->vaddr,
1149 bpage->datacount);
1150 }
1151 dmat->bounce_zone->total_bounced++;
1152 }
1153 if (op & BUS_DMASYNC_POSTREAD) {
1154 if (bpage->vaddr_nocache == 0) {
1155 cpu_dcache_inv_range(bpage->vaddr,
1156 bpage->datacount);
1157 cpu_l2cache_inv_range(bpage->vaddr,
1158 bpage->datacount);
1159 }
1160 bcopy((void *)(bpage->vaddr_nocache != 0 ?
1161 bpage->vaddr_nocache : bpage->vaddr),
1162 (void *)bpage->datavaddr, bpage->datacount);
1163 dmat->bounce_zone->total_bounced++;
1164 }
1165 }
1166 }
1167
1168 static __inline int
1169 _bus_dma_buf_is_in_bp(bus_dmamap_t map, void *buf, int len)
1170 {
1171 struct bounce_page *bpage;
1172
1173 STAILQ_FOREACH(bpage, &map->bpages, links) {
1174 if ((vm_offset_t)buf >= bpage->datavaddr &&
1175 (vm_offset_t)buf + len <= bpage->datavaddr +
1176 bpage->datacount)
1177 return (1);
1178 }
1179 return (0);
1180
1181 }
1182
1183 void
1184 _bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
1185 {
1186 struct mbuf *m;
1187 struct uio *uio;
1188 int resid;
1189 struct iovec *iov;
1190
1191 if (op == BUS_DMASYNC_POSTWRITE)
1192 return;
1193 if (STAILQ_FIRST(&map->bpages))
1194 _bus_dmamap_sync_bp(dmat, map, op);
1195 if (map->flags & DMAMAP_COHERENT)
1196 return;
1197 CTR3(KTR_BUSDMA, "%s: op %x flags %x", __func__, op, map->flags);
1198 switch(map->flags & DMAMAP_TYPE_MASK) {
1199 case DMAMAP_LINEAR:
1200 if (!(_bus_dma_buf_is_in_bp(map, map->buffer, map->len)))
1201 bus_dmamap_sync_buf(map->buffer, map->len, op);
1202 break;
1203 case DMAMAP_MBUF:
1204 m = map->buffer;
1205 while (m) {
1206 if (m->m_len > 0 &&
1207 !(_bus_dma_buf_is_in_bp(map, m->m_data, m->m_len)))
1208 bus_dmamap_sync_buf(m->m_data, m->m_len, op);
1209 m = m->m_next;
1210 }
1211 break;
1212 case DMAMAP_UIO:
1213 uio = map->buffer;
1214 iov = uio->uio_iov;
1215 resid = uio->uio_resid;
1216 for (int i = 0; i < uio->uio_iovcnt && resid != 0; i++) {
1217 bus_size_t minlen = resid < iov[i].iov_len ? resid :
1218 iov[i].iov_len;
1219 if (minlen > 0) {
1220 if (!_bus_dma_buf_is_in_bp(map, iov[i].iov_base,
1221 minlen))
1222 bus_dmamap_sync_buf(iov[i].iov_base,
1223 minlen, op);
1224 resid -= minlen;
1225 }
1226 }
1227 break;
1228 default:
1229 break;
1230 }
1231 cpu_drain_writebuf();
1232 }
1233
1234 static void
1235 init_bounce_pages(void *dummy __unused)
1236 {
1237
1238 total_bpages = 0;
1239 STAILQ_INIT(&bounce_zone_list);
1240 STAILQ_INIT(&bounce_map_waitinglist);
1241 STAILQ_INIT(&bounce_map_callbacklist);
1242 mtx_init(&bounce_lock, "bounce pages lock", NULL, MTX_DEF);
1243 }
1244 SYSINIT(bpages, SI_SUB_LOCK, SI_ORDER_ANY, init_bounce_pages, NULL);
1245
1246 static struct sysctl_ctx_list *
1247 busdma_sysctl_tree(struct bounce_zone *bz)
1248 {
1249 return (&bz->sysctl_tree);
1250 }
1251
1252 static struct sysctl_oid *
1253 busdma_sysctl_tree_top(struct bounce_zone *bz)
1254 {
1255 return (bz->sysctl_tree_top);
1256 }
1257
1258 static int
1259 alloc_bounce_zone(bus_dma_tag_t dmat)
1260 {
1261 struct bounce_zone *bz;
1262
1263 /* Check to see if we already have a suitable zone */
1264 STAILQ_FOREACH(bz, &bounce_zone_list, links) {
1265 if ((dmat->alignment <= bz->alignment)
1266 && (dmat->lowaddr >= bz->lowaddr)) {
1267 dmat->bounce_zone = bz;
1268 return (0);
1269 }
1270 }
1271
1272 if ((bz = (struct bounce_zone *)malloc(sizeof(*bz), M_DEVBUF,
1273 M_NOWAIT | M_ZERO)) == NULL)
1274 return (ENOMEM);
1275
1276 STAILQ_INIT(&bz->bounce_page_list);
1277 bz->free_bpages = 0;
1278 bz->reserved_bpages = 0;
1279 bz->active_bpages = 0;
1280 bz->lowaddr = dmat->lowaddr;
1281 bz->alignment = MAX(dmat->alignment, PAGE_SIZE);
1282 bz->map_count = 0;
1283 snprintf(bz->zoneid, 8, "zone%d", busdma_zonecount);
1284 busdma_zonecount++;
1285 snprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr);
1286 STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links);
1287 dmat->bounce_zone = bz;
1288
1289 sysctl_ctx_init(&bz->sysctl_tree);
1290 bz->sysctl_tree_top = SYSCTL_ADD_NODE(&bz->sysctl_tree,
1291 SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid,
1292 CTLFLAG_RD, 0, "");
1293 if (bz->sysctl_tree_top == NULL) {
1294 sysctl_ctx_free(&bz->sysctl_tree);
1295 return (0); /* XXX error code? */
1296 }
1297
1298 SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
1299 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1300 "total_bpages", CTLFLAG_RD, &bz->total_bpages, 0,
1301 "Total bounce pages");
1302 SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
1303 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1304 "free_bpages", CTLFLAG_RD, &bz->free_bpages, 0,
1305 "Free bounce pages");
1306 SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
1307 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1308 "reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0,
1309 "Reserved bounce pages");
1310 SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
1311 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1312 "active_bpages", CTLFLAG_RD, &bz->active_bpages, 0,
1313 "Active bounce pages");
1314 SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
1315 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1316 "total_bounced", CTLFLAG_RD, &bz->total_bounced, 0,
1317 "Total bounce requests");
1318 SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
1319 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1320 "total_deferred", CTLFLAG_RD, &bz->total_deferred, 0,
1321 "Total bounce requests that were deferred");
1322 SYSCTL_ADD_STRING(busdma_sysctl_tree(bz),
1323 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1324 "lowaddr", CTLFLAG_RD, bz->lowaddrid, 0, "");
1325 SYSCTL_ADD_INT(busdma_sysctl_tree(bz),
1326 SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO,
1327 "alignment", CTLFLAG_RD, &bz->alignment, 0, "");
1328
1329 return (0);
1330 }
1331
1332 static int
1333 alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages)
1334 {
1335 struct bounce_zone *bz;
1336 int count;
1337
1338 bz = dmat->bounce_zone;
1339 count = 0;
1340 while (numpages > 0) {
1341 struct bounce_page *bpage;
1342
1343 bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF,
1344 M_NOWAIT | M_ZERO);
1345
1346 if (bpage == NULL)
1347 break;
1348 bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
1349 M_NOWAIT, 0ul,
1350 bz->lowaddr,
1351 PAGE_SIZE,
1352 0);
1353 if (bpage->vaddr == 0) {
1354 free(bpage, M_DEVBUF);
1355 break;
1356 }
1357 bpage->busaddr = pmap_kextract(bpage->vaddr);
1358 bpage->vaddr_nocache = (vm_offset_t)arm_remap_nocache(
1359 (void *)bpage->vaddr, PAGE_SIZE);
1360 mtx_lock(&bounce_lock);
1361 STAILQ_INSERT_TAIL(&bz->bounce_page_list, bpage, links);
1362 total_bpages++;
1363 bz->total_bpages++;
1364 bz->free_bpages++;
1365 mtx_unlock(&bounce_lock);
1366 count++;
1367 numpages--;
1368 }
1369 return (count);
1370 }
1371
1372 static int
1373 reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, int commit)
1374 {
1375 struct bounce_zone *bz;
1376 int pages;
1377
1378 mtx_assert(&bounce_lock, MA_OWNED);
1379 bz = dmat->bounce_zone;
1380 pages = MIN(bz->free_bpages, map->pagesneeded - map->pagesreserved);
1381 if (commit == 0 && map->pagesneeded > (map->pagesreserved + pages))
1382 return (map->pagesneeded - (map->pagesreserved + pages));
1383 bz->free_bpages -= pages;
1384 bz->reserved_bpages += pages;
1385 map->pagesreserved += pages;
1386 pages = map->pagesneeded - map->pagesreserved;
1387
1388 return (pages);
1389 }
1390
1391 static bus_addr_t
1392 add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
1393 bus_size_t size)
1394 {
1395 struct bounce_zone *bz;
1396 struct bounce_page *bpage;
1397
1398 KASSERT(dmat->bounce_zone != NULL, ("no bounce zone in dma tag"));
1399 KASSERT(map != NULL, ("add_bounce_page: bad map %p", map));
1400
1401 bz = dmat->bounce_zone;
1402 if (map->pagesneeded == 0)
1403 panic("add_bounce_page: map doesn't need any pages");
1404 map->pagesneeded--;
1405
1406 if (map->pagesreserved == 0)
1407 panic("add_bounce_page: map doesn't need any pages");
1408 map->pagesreserved--;
1409
1410 mtx_lock(&bounce_lock);
1411 bpage = STAILQ_FIRST(&bz->bounce_page_list);
1412 if (bpage == NULL)
1413 panic("add_bounce_page: free page list is empty");
1414
1415 STAILQ_REMOVE_HEAD(&bz->bounce_page_list, links);
1416 bz->reserved_bpages--;
1417 bz->active_bpages++;
1418 mtx_unlock(&bounce_lock);
1419
1420 if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
1421 /* Page offset needs to be preserved. */
1422 bpage->vaddr |= vaddr & PAGE_MASK;
1423 bpage->busaddr |= vaddr & PAGE_MASK;
1424 }
1425 bpage->datavaddr = vaddr;
1426 bpage->datacount = size;
1427 STAILQ_INSERT_TAIL(&(map->bpages), bpage, links);
1428 return (bpage->busaddr);
1429 }
1430
1431 static void
1432 free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
1433 {
1434 struct bus_dmamap *map;
1435 struct bounce_zone *bz;
1436
1437 bz = dmat->bounce_zone;
1438 bpage->datavaddr = 0;
1439 bpage->datacount = 0;
1440 if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
1441 /*
1442 * Reset the bounce page to start at offset 0. Other uses
1443 * of this bounce page may need to store a full page of
1444 * data and/or assume it starts on a page boundary.
1445 */
1446 bpage->vaddr &= ~PAGE_MASK;
1447 bpage->busaddr &= ~PAGE_MASK;
1448 }
1449
1450 mtx_lock(&bounce_lock);
1451 STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
1452 bz->free_bpages++;
1453 bz->active_bpages--;
1454 if ((map = STAILQ_FIRST(&bounce_map_waitinglist)) != NULL) {
1455 if (reserve_bounce_pages(map->dmat, map, 1) == 0) {
1456 STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links);
1457 STAILQ_INSERT_TAIL(&bounce_map_callbacklist,
1458 map, links);
1459 busdma_swi_pending = 1;
1460 bz->total_deferred++;
1461 swi_sched(vm_ih, 0);
1462 }
1463 }
1464 mtx_unlock(&bounce_lock);
1465 }
1466
1467 void
1468 busdma_swi(void)
1469 {
1470 bus_dma_tag_t dmat;
1471 struct bus_dmamap *map;
1472
1473 mtx_lock(&bounce_lock);
1474 while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) {
1475 STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links);
1476 mtx_unlock(&bounce_lock);
1477 dmat = map->dmat;
1478 (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_LOCK);
1479 bus_dmamap_load(map->dmat, map, map->buffer, map->len,
1480 map->callback, map->callback_arg, /*flags*/0);
1481 (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_UNLOCK);
1482 mtx_lock(&bounce_lock);
1483 }
1484 mtx_unlock(&bounce_lock);
1485 }
Cache object: 5d9bef397c20b5d3f605d1473da5eea1
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