2 * Copyright (c) 2012 EMC Corp.
5 * Copyright (c) 1997, 1998 Justin T. Gibbs.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
37 #include <sys/systm.h>
40 #include <sys/callout.h>
42 #include <sys/memdesc.h>
47 #include <vm/vm_page.h>
48 #include <vm/vm_map.h>
52 #include <cam/cam_ccb.h>
54 #include <machine/bus.h>
57 * Load up data starting at offset within a region specified by a
58 * list of virtual address ranges until either length or the region
62 _bus_dmamap_load_vlist(bus_dma_tag_t dmat, bus_dmamap_t map,
63 bus_dma_segment_t *list, int sglist_cnt, struct pmap *pmap, int *nsegs,
64 int flags, size_t offset, size_t length)
69 for (; sglist_cnt > 0 && length != 0; sglist_cnt--, list++) {
73 KASSERT((offset < list->ds_len),
74 ("Invalid mid-segment offset"));
75 addr = (char *)(uintptr_t)list->ds_addr + offset;
76 ds_len = list->ds_len - offset;
81 KASSERT((ds_len != 0), ("Segment length is zero"));
82 error = _bus_dmamap_load_buffer(dmat, map, addr, ds_len, pmap,
91 * Load a list of physical addresses.
94 _bus_dmamap_load_plist(bus_dma_tag_t dmat, bus_dmamap_t map,
95 bus_dma_segment_t *list, int sglist_cnt, int *nsegs, int flags)
100 for (; sglist_cnt > 0; sglist_cnt--, list++) {
101 error = _bus_dmamap_load_phys(dmat, map,
102 (vm_paddr_t)list->ds_addr, list->ds_len, flags, NULL,
111 * Load an mbuf chain.
114 _bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map,
115 struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, int flags)
121 for (m = m0; m != NULL && error == 0; m = m->m_next) {
123 error = _bus_dmamap_load_buffer(dmat, map, m->m_data,
124 m->m_len, kernel_pmap, flags | BUS_DMA_LOAD_MBUF,
128 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
129 __func__, dmat, flags, error, *nsegs);
134 * Load tlen data starting at offset within a region specified by a list of
138 _bus_dmamap_load_pages(bus_dma_tag_t dmat, bus_dmamap_t map,
139 vm_page_t *pages, bus_size_t tlen, int offset, int *nsegs, int flags)
145 for (i = 0, error = 0; error == 0 && tlen > 0; i++, tlen -= len) {
146 len = min(PAGE_SIZE - offset, tlen);
147 paddr = VM_PAGE_TO_PHYS(pages[i]) + offset;
148 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
156 * Load from block io.
159 _bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
160 int *nsegs, int flags)
163 if ((bio->bio_flags & BIO_VLIST) != 0) {
164 bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
165 return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
166 kernel_pmap, nsegs, flags, bio->bio_ma_offset,
170 if ((bio->bio_flags & BIO_UNMAPPED) != 0)
171 return (_bus_dmamap_load_pages(dmat, map, bio->bio_ma,
172 bio->bio_bcount, bio->bio_ma_offset, nsegs, flags));
174 return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
175 bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
179 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
180 struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
181 bus_dma_segment_t *segs, int *segp)
188 for (i = 0; tlen > 0; i++, tlen -= len) {
189 len = min(PAGE_SIZE - ma_offs, tlen);
190 paddr = VM_PAGE_TO_PHYS(ma[i]) + ma_offs;
191 error = _bus_dmamap_load_phys(dmat, map, paddr, len,
201 * Load a cam control block.
204 _bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
205 int *nsegs, int flags)
207 struct ccb_hdr *ccb_h;
215 switch (ccb_h->func_code) {
217 struct ccb_scsiio *csio;
220 data_ptr = csio->data_ptr;
221 dxfer_len = csio->dxfer_len;
222 sglist_cnt = csio->sglist_cnt;
225 case XPT_CONT_TARGET_IO: {
226 struct ccb_scsiio *ctio;
229 data_ptr = ctio->data_ptr;
230 dxfer_len = ctio->dxfer_len;
231 sglist_cnt = ctio->sglist_cnt;
235 struct ccb_ataio *ataio;
238 data_ptr = ataio->data_ptr;
239 dxfer_len = ataio->dxfer_len;
244 panic("_bus_dmamap_load_ccb: Unsupported func code %d",
248 switch ((ccb_h->flags & CAM_DATA_MASK)) {
250 error = _bus_dmamap_load_buffer(dmat, map, data_ptr, dxfer_len,
251 kernel_pmap, flags, NULL, nsegs);
254 error = _bus_dmamap_load_phys(dmat, map,
255 (vm_paddr_t)(uintptr_t)data_ptr, dxfer_len, flags, NULL,
259 error = _bus_dmamap_load_vlist(dmat, map,
260 (bus_dma_segment_t *)data_ptr, sglist_cnt, kernel_pmap,
261 nsegs, flags, 0, dxfer_len);
263 case CAM_DATA_SG_PADDR:
264 error = _bus_dmamap_load_plist(dmat, map,
265 (bus_dma_segment_t *)data_ptr, sglist_cnt, nsegs, flags);
268 error = _bus_dmamap_load_bio(dmat, map, (struct bio *)data_ptr,
272 panic("_bus_dmamap_load_ccb: flags 0x%X unimplemented",
282 _bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
283 int *nsegs, int flags)
292 if (uio->uio_segflg == UIO_USERSPACE) {
293 KASSERT(uio->uio_td != NULL,
294 ("bus_dmamap_load_uio: USERSPACE but no proc"));
295 pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
298 resid = uio->uio_resid;
302 for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
304 * Now at the first iovec to load. Load each iovec
305 * until we have exhausted the residual count.
308 addr = (caddr_t) iov[i].iov_base;
309 minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
311 error = _bus_dmamap_load_buffer(dmat, map, addr,
312 minlen, pmap, flags, NULL, nsegs);
321 * Map the buffer buf into bus space using the dmamap map.
324 bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
325 bus_size_t buflen, bus_dmamap_callback_t *callback,
326 void *callback_arg, int flags)
328 bus_dma_segment_t *segs;
333 if ((flags & BUS_DMA_NOWAIT) == 0) {
334 mem = memdesc_vaddr(buf, buflen);
335 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
339 error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, kernel_pmap,
340 flags, NULL, &nsegs);
343 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
344 __func__, dmat, flags, error, nsegs);
346 if (error == EINPROGRESS)
349 segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
351 (*callback)(callback_arg, segs, 0, error);
353 (*callback)(callback_arg, segs, nsegs, 0);
356 * Return ENOMEM to the caller so that it can pass it up the stack.
357 * This error only happens when NOWAIT is set, so deferral is disabled.
366 bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
367 bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
369 bus_dma_segment_t *segs;
374 flags |= BUS_DMA_NOWAIT;
376 error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, NULL, &nsegs, flags);
379 segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
381 (*callback)(callback_arg, segs, 0, 0, error);
383 (*callback)(callback_arg, segs, nsegs, m0->m_pkthdr.len, error);
385 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
386 __func__, dmat, flags, error, nsegs);
391 bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
392 bus_dma_segment_t *segs, int *nsegs, int flags)
396 flags |= BUS_DMA_NOWAIT;
398 error = _bus_dmamap_load_mbuf_sg(dmat, map, m0, segs, nsegs, flags);
400 _bus_dmamap_complete(dmat, map, segs, *nsegs, error);
405 bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
406 bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
408 bus_dma_segment_t *segs;
411 flags |= BUS_DMA_NOWAIT;
413 error = _bus_dmamap_load_uio(dmat, map, uio, &nsegs, flags);
416 segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
418 (*callback)(callback_arg, segs, 0, 0, error);
420 (*callback)(callback_arg, segs, nsegs, uio->uio_resid, error);
422 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
423 __func__, dmat, flags, error, nsegs);
428 bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
429 bus_dmamap_callback_t *callback, void *callback_arg,
432 bus_dma_segment_t *segs;
433 struct ccb_hdr *ccb_h;
439 if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
440 callback(callback_arg, NULL, 0, 0);
443 if ((flags & BUS_DMA_NOWAIT) == 0) {
444 mem = memdesc_ccb(ccb);
445 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
448 error = _bus_dmamap_load_ccb(dmat, map, ccb, &nsegs, flags);
451 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
452 __func__, dmat, flags, error, nsegs);
454 if (error == EINPROGRESS)
457 segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
459 (*callback)(callback_arg, segs, 0, error);
461 (*callback)(callback_arg, segs, nsegs, error);
463 * Return ENOMEM to the caller so that it can pass it up the stack.
464 * This error only happens when NOWAIT is set, so deferral is disabled.
473 bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
474 bus_dmamap_callback_t *callback, void *callback_arg,
477 bus_dma_segment_t *segs;
482 if ((flags & BUS_DMA_NOWAIT) == 0) {
483 mem = memdesc_bio(bio);
484 _bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
487 error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
490 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
491 __func__, dmat, flags, error, nsegs);
493 if (error == EINPROGRESS)
496 segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
498 (*callback)(callback_arg, segs, 0, error);
500 (*callback)(callback_arg, segs, nsegs, error);
502 * Return ENOMEM to the caller so that it can pass it up the stack.
503 * This error only happens when NOWAIT is set, so deferral is disabled.
512 bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map,
513 struct memdesc *mem, bus_dmamap_callback_t *callback,
514 void *callback_arg, int flags)
516 bus_dma_segment_t *segs;
520 if ((flags & BUS_DMA_NOWAIT) == 0)
521 _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg);
525 switch (mem->md_type) {
527 error = _bus_dmamap_load_buffer(dmat, map, mem->u.md_vaddr,
528 mem->md_opaque, kernel_pmap, flags, NULL, &nsegs);
531 error = _bus_dmamap_load_phys(dmat, map, mem->u.md_paddr,
532 mem->md_opaque, flags, NULL, &nsegs);
535 error = _bus_dmamap_load_vlist(dmat, map, mem->u.md_list,
536 mem->md_opaque, kernel_pmap, &nsegs, flags, 0, SIZE_T_MAX);
539 error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
540 mem->md_opaque, &nsegs, flags);
543 error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
547 error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
551 error = _bus_dmamap_load_mbuf_sg(dmat, map, mem->u.md_mbuf,
552 NULL, &nsegs, flags);
555 error = _bus_dmamap_load_ccb(dmat, map, mem->u.md_ccb, &nsegs,
561 CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
562 __func__, dmat, flags, error, nsegs);
564 if (error == EINPROGRESS)
567 segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
569 (*callback)(callback_arg, segs, 0, error);
571 (*callback)(callback_arg, segs, nsegs, 0);
574 * Return ENOMEM to the caller so that it can pass it up the stack.
575 * This error only happens when NOWAIT is set, so deferral is disabled.