1b2b3ffcdSSimon Schubert /*
2b2b3ffcdSSimon Schubert * Copyright (c) 1997, 1998 Justin T. Gibbs.
3b2b3ffcdSSimon Schubert * All rights reserved.
4b2b3ffcdSSimon Schubert *
5b2b3ffcdSSimon Schubert * Redistribution and use in source and binary forms, with or without
6b2b3ffcdSSimon Schubert * modification, are permitted provided that the following conditions
7b2b3ffcdSSimon Schubert * are met:
8b2b3ffcdSSimon Schubert * 1. Redistributions of source code must retain the above copyright
9b2b3ffcdSSimon Schubert * notice, this list of conditions, and the following disclaimer,
10b2b3ffcdSSimon Schubert * without modification, immediately at the beginning of the file.
11b2b3ffcdSSimon Schubert * 2. The name of the author may not be used to endorse or promote products
12b2b3ffcdSSimon Schubert * derived from this software without specific prior written permission.
13b2b3ffcdSSimon Schubert *
14b2b3ffcdSSimon Schubert * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15b2b3ffcdSSimon Schubert * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16b2b3ffcdSSimon Schubert * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17b2b3ffcdSSimon Schubert * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
18b2b3ffcdSSimon Schubert * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19b2b3ffcdSSimon Schubert * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20b2b3ffcdSSimon Schubert * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21b2b3ffcdSSimon Schubert * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22b2b3ffcdSSimon Schubert * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23b2b3ffcdSSimon Schubert * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24b2b3ffcdSSimon Schubert * SUCH DAMAGE.
25b2b3ffcdSSimon Schubert *
26b2b3ffcdSSimon Schubert * $FreeBSD: src/sys/i386/i386/busdma_machdep.c,v 1.94 2008/08/15 20:51:31 kmacy Exp $
27b2b3ffcdSSimon Schubert */
28b2b3ffcdSSimon Schubert
29b2b3ffcdSSimon Schubert #include <sys/param.h>
30b2b3ffcdSSimon Schubert #include <sys/systm.h>
31b2b3ffcdSSimon Schubert #include <sys/malloc.h>
32b2b3ffcdSSimon Schubert #include <sys/mbuf.h>
33b2b3ffcdSSimon Schubert #include <sys/uio.h>
34b2b3ffcdSSimon Schubert #include <sys/bus_dma.h>
35b2b3ffcdSSimon Schubert #include <sys/kernel.h>
36b2b3ffcdSSimon Schubert #include <sys/sysctl.h>
37b2b3ffcdSSimon Schubert #include <sys/lock.h>
38684a93c4SMatthew Dillon
39b2b3ffcdSSimon Schubert #include <sys/spinlock2.h>
40b2b3ffcdSSimon Schubert
41b2b3ffcdSSimon Schubert #include <vm/vm.h>
42b2b3ffcdSSimon Schubert #include <vm/vm_page.h>
43b2b3ffcdSSimon Schubert
44b2b3ffcdSSimon Schubert /* XXX needed for to access pmap to convert per-proc virtual to physical */
45b2b3ffcdSSimon Schubert #include <sys/proc.h>
46b2b3ffcdSSimon Schubert #include <vm/vm_map.h>
47b2b3ffcdSSimon Schubert
48b2b3ffcdSSimon Schubert #include <machine/md_var.h>
49fbd57254SSepherosa Ziehau #include <machine/pmap.h>
50b2b3ffcdSSimon Schubert
519eb6f109SSepherosa Ziehau #include <bus/cam/cam.h>
529eb6f109SSepherosa Ziehau #include <bus/cam/cam_ccb.h>
539eb6f109SSepherosa Ziehau
54b2b3ffcdSSimon Schubert #define MAX_BPAGES 1024
55b2b3ffcdSSimon Schubert
56b2b3ffcdSSimon Schubert /*
57b2b3ffcdSSimon Schubert * 16 x N declared on stack.
58b2b3ffcdSSimon Schubert */
59b2b3ffcdSSimon Schubert #define BUS_DMA_CACHE_SEGMENTS 8
60b2b3ffcdSSimon Schubert
61b2b3ffcdSSimon Schubert struct bounce_zone;
62b2b3ffcdSSimon Schubert struct bus_dmamap;
63b2b3ffcdSSimon Schubert
64b2b3ffcdSSimon Schubert struct bus_dma_tag {
65b2b3ffcdSSimon Schubert bus_size_t alignment;
66b2b3ffcdSSimon Schubert bus_size_t boundary;
67b2b3ffcdSSimon Schubert bus_addr_t lowaddr;
68b2b3ffcdSSimon Schubert bus_addr_t highaddr;
69b2b3ffcdSSimon Schubert bus_size_t maxsize;
70b2b3ffcdSSimon Schubert u_int nsegments;
71b2b3ffcdSSimon Schubert bus_size_t maxsegsz;
72b2b3ffcdSSimon Schubert int flags;
73b2b3ffcdSSimon Schubert int map_count;
74b2b3ffcdSSimon Schubert bus_dma_segment_t *segments;
75b2b3ffcdSSimon Schubert struct bounce_zone *bounce_zone;
76b2b3ffcdSSimon Schubert struct spinlock spin;
77b2b3ffcdSSimon Schubert };
78b2b3ffcdSSimon Schubert
79b2b3ffcdSSimon Schubert /*
80b2b3ffcdSSimon Schubert * bus_dma_tag private flags
81b2b3ffcdSSimon Schubert */
82b2b3ffcdSSimon Schubert #define BUS_DMA_BOUNCE_ALIGN BUS_DMA_BUS2
83b2b3ffcdSSimon Schubert #define BUS_DMA_BOUNCE_LOWADDR BUS_DMA_BUS3
84b2b3ffcdSSimon Schubert #define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
85b2b3ffcdSSimon Schubert
86b2b3ffcdSSimon Schubert #define BUS_DMA_COULD_BOUNCE (BUS_DMA_BOUNCE_LOWADDR | BUS_DMA_BOUNCE_ALIGN)
87b2b3ffcdSSimon Schubert
88b2b3ffcdSSimon Schubert #define BUS_DMAMEM_KMALLOC(dmat) \
89b2b3ffcdSSimon Schubert ((dmat)->maxsize <= PAGE_SIZE && \
90b2b3ffcdSSimon Schubert (dmat)->alignment <= PAGE_SIZE && \
91b2b3ffcdSSimon Schubert (dmat)->lowaddr >= ptoa(Maxmem))
92b2b3ffcdSSimon Schubert
93b2b3ffcdSSimon Schubert struct bounce_page {
94b2b3ffcdSSimon Schubert vm_offset_t vaddr; /* kva of bounce buffer */
95b2b3ffcdSSimon Schubert bus_addr_t busaddr; /* Physical address */
96b2b3ffcdSSimon Schubert vm_offset_t datavaddr; /* kva of client data */
97b2b3ffcdSSimon Schubert bus_size_t datacount; /* client data count */
98b2b3ffcdSSimon Schubert STAILQ_ENTRY(bounce_page) links;
99b2b3ffcdSSimon Schubert };
100b2b3ffcdSSimon Schubert
101b2b3ffcdSSimon Schubert struct bounce_zone {
102b2b3ffcdSSimon Schubert STAILQ_ENTRY(bounce_zone) links;
103b2b3ffcdSSimon Schubert STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
104b2b3ffcdSSimon Schubert STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist;
105b2b3ffcdSSimon Schubert struct spinlock spin;
106b2b3ffcdSSimon Schubert int total_bpages;
107b2b3ffcdSSimon Schubert int free_bpages;
108b2b3ffcdSSimon Schubert int reserved_bpages;
109b2b3ffcdSSimon Schubert int active_bpages;
110b2b3ffcdSSimon Schubert int total_bounced;
111b2b3ffcdSSimon Schubert int total_deferred;
112b2b3ffcdSSimon Schubert int reserve_failed;
113b2b3ffcdSSimon Schubert bus_size_t alignment;
114b2b3ffcdSSimon Schubert bus_addr_t lowaddr;
115b2b3ffcdSSimon Schubert char zoneid[8];
116b2b3ffcdSSimon Schubert char lowaddrid[20];
117b2b3ffcdSSimon Schubert struct sysctl_ctx_list sysctl_ctx;
118b2b3ffcdSSimon Schubert struct sysctl_oid *sysctl_tree;
119b2b3ffcdSSimon Schubert };
120b2b3ffcdSSimon Schubert
121287a8577SAlex Hornung #define BZ_LOCK(bz) spin_lock(&(bz)->spin)
122287a8577SAlex Hornung #define BZ_UNLOCK(bz) spin_unlock(&(bz)->spin)
123b2b3ffcdSSimon Schubert
12412586b82SMatthew Dillon static struct lwkt_token bounce_zone_tok =
125a3c18566SMatthew Dillon LWKT_TOKEN_INITIALIZER(bounce_zone_token);
126b2b3ffcdSSimon Schubert static int busdma_zonecount;
127b2b3ffcdSSimon Schubert static STAILQ_HEAD(, bounce_zone) bounce_zone_list =
128b2b3ffcdSSimon Schubert STAILQ_HEAD_INITIALIZER(bounce_zone_list);
129b2b3ffcdSSimon Schubert
1307dbe273fSSepherosa Ziehau static int busdma_priv_zonecount = -1;
1317dbe273fSSepherosa Ziehau
132b2b3ffcdSSimon Schubert int busdma_swi_pending;
133b2b3ffcdSSimon Schubert static int total_bounce_pages;
134b2b3ffcdSSimon Schubert static int max_bounce_pages = MAX_BPAGES;
135b2b3ffcdSSimon Schubert static int bounce_alignment = 1; /* XXX temporary */
136b2b3ffcdSSimon Schubert
137b2b3ffcdSSimon Schubert TUNABLE_INT("hw.busdma.max_bpages", &max_bounce_pages);
138b2b3ffcdSSimon Schubert TUNABLE_INT("hw.busdma.bounce_alignment", &bounce_alignment);
139b2b3ffcdSSimon Schubert
140b2b3ffcdSSimon Schubert struct bus_dmamap {
141b2b3ffcdSSimon Schubert struct bp_list bpages;
142b2b3ffcdSSimon Schubert int pagesneeded;
143b2b3ffcdSSimon Schubert int pagesreserved;
144b2b3ffcdSSimon Schubert bus_dma_tag_t dmat;
145b2b3ffcdSSimon Schubert void *buf; /* unmapped buffer pointer */
146b2b3ffcdSSimon Schubert bus_size_t buflen; /* unmapped buffer length */
147b2b3ffcdSSimon Schubert bus_dmamap_callback_t *callback;
148b2b3ffcdSSimon Schubert void *callback_arg;
149b2b3ffcdSSimon Schubert STAILQ_ENTRY(bus_dmamap) links;
150b2b3ffcdSSimon Schubert };
151b2b3ffcdSSimon Schubert
152b2b3ffcdSSimon Schubert static STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist =
153b2b3ffcdSSimon Schubert STAILQ_HEAD_INITIALIZER(bounce_map_callbacklist);
1540d4f82f8SMatthew Dillon static struct spinlock bounce_map_list_spin =
155ba87a4abSSascha Wildner SPINLOCK_INITIALIZER(&bounce_map_list_spin, "bounce_map_list_spin");
156b2b3ffcdSSimon Schubert
157b2b3ffcdSSimon Schubert static struct bus_dmamap nobounce_dmamap;
158b2b3ffcdSSimon Schubert
159b2b3ffcdSSimon Schubert static int alloc_bounce_zone(bus_dma_tag_t);
160b2b3ffcdSSimon Schubert static int alloc_bounce_pages(bus_dma_tag_t, u_int, int);
1617dbe273fSSepherosa Ziehau static void free_bounce_pages_all(bus_dma_tag_t);
1627dbe273fSSepherosa Ziehau static void free_bounce_zone(bus_dma_tag_t);
163b2b3ffcdSSimon Schubert static int reserve_bounce_pages(bus_dma_tag_t, bus_dmamap_t, int);
164b2b3ffcdSSimon Schubert static void return_bounce_pages(bus_dma_tag_t, bus_dmamap_t);
165b2b3ffcdSSimon Schubert static bus_addr_t add_bounce_page(bus_dma_tag_t, bus_dmamap_t,
16633025e31SMatthew Dillon vm_offset_t, bus_size_t *);
167b2b3ffcdSSimon Schubert static void free_bounce_page(bus_dma_tag_t, struct bounce_page *);
168b2b3ffcdSSimon Schubert
169b2b3ffcdSSimon Schubert static bus_dmamap_t get_map_waiting(bus_dma_tag_t);
170b2b3ffcdSSimon Schubert static void add_map_callback(bus_dmamap_t);
171b2b3ffcdSSimon Schubert
172db2ec6f8SSascha Wildner static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0, "Busdma parameters");
173b2b3ffcdSSimon Schubert SYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bounce_pages,
174b2b3ffcdSSimon Schubert 0, "Total bounce pages");
175b2b3ffcdSSimon Schubert SYSCTL_INT(_hw_busdma, OID_AUTO, max_bpages, CTLFLAG_RD, &max_bounce_pages,
176b2b3ffcdSSimon Schubert 0, "Max bounce pages per bounce zone");
177b2b3ffcdSSimon Schubert SYSCTL_INT(_hw_busdma, OID_AUTO, bounce_alignment, CTLFLAG_RD,
178b2b3ffcdSSimon Schubert &bounce_alignment, 0, "Obey alignment constraint");
179b2b3ffcdSSimon Schubert
180*030b0c8cSMichael Neumann
181*030b0c8cSMichael Neumann /*
182*030b0c8cSMichael Neumann * Returns true if the address falls within the tag's exclusion window, or
183*030b0c8cSMichael Neumann * fails to meet its alignment requirements.
184*030b0c8cSMichael Neumann */
185b2b3ffcdSSimon Schubert static __inline int
addr_needs_bounce(bus_dma_tag_t dmat,bus_addr_t paddr)186*030b0c8cSMichael Neumann addr_needs_bounce(bus_dma_tag_t dmat, bus_addr_t paddr)
187b2b3ffcdSSimon Schubert {
188*030b0c8cSMichael Neumann if ((paddr > dmat->lowaddr && paddr <= dmat->highaddr) ||
189b2b3ffcdSSimon Schubert (bounce_alignment && (paddr & (dmat->alignment - 1)) != 0))
190*030b0c8cSMichael Neumann return (1);
191b2b3ffcdSSimon Schubert
192*030b0c8cSMichael Neumann return (0);
193b2b3ffcdSSimon Schubert }
194b2b3ffcdSSimon Schubert
195b2b3ffcdSSimon Schubert static __inline
196b2b3ffcdSSimon Schubert bus_dma_segment_t *
bus_dma_tag_lock(bus_dma_tag_t tag,bus_dma_segment_t * cache)197b2b3ffcdSSimon Schubert bus_dma_tag_lock(bus_dma_tag_t tag, bus_dma_segment_t *cache)
198b2b3ffcdSSimon Schubert {
199c26842b6SSepherosa Ziehau if (tag->flags & BUS_DMA_PROTECTED)
200c26842b6SSepherosa Ziehau return(tag->segments);
201c26842b6SSepherosa Ziehau
202b2b3ffcdSSimon Schubert if (tag->nsegments <= BUS_DMA_CACHE_SEGMENTS)
203b2b3ffcdSSimon Schubert return(cache);
204287a8577SAlex Hornung spin_lock(&tag->spin);
205b2b3ffcdSSimon Schubert return(tag->segments);
206b2b3ffcdSSimon Schubert }
207b2b3ffcdSSimon Schubert
208b2b3ffcdSSimon Schubert static __inline
209b2b3ffcdSSimon Schubert void
bus_dma_tag_unlock(bus_dma_tag_t tag)210b2b3ffcdSSimon Schubert bus_dma_tag_unlock(bus_dma_tag_t tag)
211b2b3ffcdSSimon Schubert {
212c26842b6SSepherosa Ziehau if (tag->flags & BUS_DMA_PROTECTED)
213c26842b6SSepherosa Ziehau return;
214c26842b6SSepherosa Ziehau
215b2b3ffcdSSimon Schubert if (tag->nsegments > BUS_DMA_CACHE_SEGMENTS)
216287a8577SAlex Hornung spin_unlock(&tag->spin);
217b2b3ffcdSSimon Schubert }
218b2b3ffcdSSimon Schubert
219b2b3ffcdSSimon Schubert /*
220b2b3ffcdSSimon Schubert * Allocate a device specific dma_tag.
221b2b3ffcdSSimon Schubert */
222b2b3ffcdSSimon Schubert int
bus_dma_tag_create(bus_dma_tag_t parent,bus_size_t alignment,bus_size_t boundary,bus_addr_t lowaddr,bus_addr_t highaddr,bus_size_t maxsize,int nsegments,bus_size_t maxsegsz,int flags,bus_dma_tag_t * dmat)223b2b3ffcdSSimon Schubert bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
224b2b3ffcdSSimon Schubert bus_size_t boundary, bus_addr_t lowaddr,
225*030b0c8cSMichael Neumann bus_addr_t highaddr, bus_size_t maxsize, int nsegments,
226b2b3ffcdSSimon Schubert bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat)
227b2b3ffcdSSimon Schubert {
228b2b3ffcdSSimon Schubert bus_dma_tag_t newtag;
229b2b3ffcdSSimon Schubert int error = 0;
230b2b3ffcdSSimon Schubert
231b2b3ffcdSSimon Schubert /*
232b2b3ffcdSSimon Schubert * Sanity checks
233b2b3ffcdSSimon Schubert */
234b2b3ffcdSSimon Schubert
235b2b3ffcdSSimon Schubert if (alignment == 0)
236b2b3ffcdSSimon Schubert alignment = 1;
237b2b3ffcdSSimon Schubert if (alignment & (alignment - 1))
238ed20d0e3SSascha Wildner panic("alignment must be power of 2");
239b2b3ffcdSSimon Schubert
240b2b3ffcdSSimon Schubert if (boundary != 0) {
241b2b3ffcdSSimon Schubert if (boundary & (boundary - 1))
242ed20d0e3SSascha Wildner panic("boundary must be power of 2");
243b2b3ffcdSSimon Schubert if (boundary < maxsegsz) {
244b2b3ffcdSSimon Schubert kprintf("boundary < maxsegsz:\n");
2457ce2998eSAlex Hornung print_backtrace(-1);
246b2b3ffcdSSimon Schubert maxsegsz = boundary;
247b2b3ffcdSSimon Schubert }
248b2b3ffcdSSimon Schubert }
249b2b3ffcdSSimon Schubert
250b2b3ffcdSSimon Schubert /* Return a NULL tag on failure */
251b2b3ffcdSSimon Schubert *dmat = NULL;
252b2b3ffcdSSimon Schubert
253b2b3ffcdSSimon Schubert newtag = kmalloc(sizeof(*newtag), M_DEVBUF, M_INTWAIT | M_ZERO);
254b2b3ffcdSSimon Schubert
255ba87a4abSSascha Wildner spin_init(&newtag->spin, "busdmacreate");
256b2b3ffcdSSimon Schubert newtag->alignment = alignment;
257b2b3ffcdSSimon Schubert newtag->boundary = boundary;
258b2b3ffcdSSimon Schubert newtag->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1);
259b2b3ffcdSSimon Schubert newtag->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1);
260b2b3ffcdSSimon Schubert newtag->maxsize = maxsize;
261b2b3ffcdSSimon Schubert newtag->nsegments = nsegments;
262b2b3ffcdSSimon Schubert newtag->maxsegsz = maxsegsz;
263b2b3ffcdSSimon Schubert newtag->flags = flags;
264b2b3ffcdSSimon Schubert newtag->map_count = 0;
265b2b3ffcdSSimon Schubert newtag->segments = NULL;
266b2b3ffcdSSimon Schubert newtag->bounce_zone = NULL;
267b2b3ffcdSSimon Schubert
268b2b3ffcdSSimon Schubert /* Take into account any restrictions imposed by our parent tag */
269b2b3ffcdSSimon Schubert if (parent != NULL) {
270b2b3ffcdSSimon Schubert newtag->lowaddr = MIN(parent->lowaddr, newtag->lowaddr);
271b2b3ffcdSSimon Schubert newtag->highaddr = MAX(parent->highaddr, newtag->highaddr);
272b2b3ffcdSSimon Schubert
273b2b3ffcdSSimon Schubert if (newtag->boundary == 0) {
274b2b3ffcdSSimon Schubert newtag->boundary = parent->boundary;
275b2b3ffcdSSimon Schubert } else if (parent->boundary != 0) {
276b2b3ffcdSSimon Schubert newtag->boundary = MIN(parent->boundary,
277b2b3ffcdSSimon Schubert newtag->boundary);
278b2b3ffcdSSimon Schubert }
279b2b3ffcdSSimon Schubert
280b2b3ffcdSSimon Schubert #ifdef notyet
281b2b3ffcdSSimon Schubert newtag->alignment = MAX(parent->alignment, newtag->alignment);
282b2b3ffcdSSimon Schubert #endif
283b2b3ffcdSSimon Schubert
284b2b3ffcdSSimon Schubert }
285b2b3ffcdSSimon Schubert
286b2b3ffcdSSimon Schubert if (newtag->lowaddr < ptoa(Maxmem))
287b2b3ffcdSSimon Schubert newtag->flags |= BUS_DMA_BOUNCE_LOWADDR;
288b2b3ffcdSSimon Schubert if (bounce_alignment && newtag->alignment > 1 &&
289b2b3ffcdSSimon Schubert !(newtag->flags & BUS_DMA_ALIGNED))
290b2b3ffcdSSimon Schubert newtag->flags |= BUS_DMA_BOUNCE_ALIGN;
291b2b3ffcdSSimon Schubert
292b2b3ffcdSSimon Schubert if ((newtag->flags & BUS_DMA_COULD_BOUNCE) &&
293b2b3ffcdSSimon Schubert (flags & BUS_DMA_ALLOCNOW) != 0) {
294b2b3ffcdSSimon Schubert struct bounce_zone *bz;
295b2b3ffcdSSimon Schubert
296b2b3ffcdSSimon Schubert /* Must bounce */
297b2b3ffcdSSimon Schubert
298b2b3ffcdSSimon Schubert error = alloc_bounce_zone(newtag);
299b2b3ffcdSSimon Schubert if (error)
300b2b3ffcdSSimon Schubert goto back;
301b2b3ffcdSSimon Schubert bz = newtag->bounce_zone;
302b2b3ffcdSSimon Schubert
3037dbe273fSSepherosa Ziehau if ((newtag->flags & BUS_DMA_ALLOCALL) == 0 &&
3047dbe273fSSepherosa Ziehau ptoa(bz->total_bpages) < maxsize) {
305b2b3ffcdSSimon Schubert int pages;
306b2b3ffcdSSimon Schubert
307b2b3ffcdSSimon Schubert if (flags & BUS_DMA_ONEBPAGE) {
308b2b3ffcdSSimon Schubert pages = 1;
309b2b3ffcdSSimon Schubert } else {
310b2b3ffcdSSimon Schubert pages = atop(round_page(maxsize)) -
311b2b3ffcdSSimon Schubert bz->total_bpages;
312b2b3ffcdSSimon Schubert pages = MAX(pages, 1);
313b2b3ffcdSSimon Schubert }
314b2b3ffcdSSimon Schubert
315b2b3ffcdSSimon Schubert /* Add pages to our bounce pool */
316b2b3ffcdSSimon Schubert if (alloc_bounce_pages(newtag, pages, flags) < pages)
317b2b3ffcdSSimon Schubert error = ENOMEM;
318b2b3ffcdSSimon Schubert
319b2b3ffcdSSimon Schubert /* Performed initial allocation */
320b2b3ffcdSSimon Schubert newtag->flags |= BUS_DMA_MIN_ALLOC_COMP;
321b2b3ffcdSSimon Schubert }
322b2b3ffcdSSimon Schubert }
323b2b3ffcdSSimon Schubert back:
32437111f9cSSepherosa Ziehau if (error) {
32537111f9cSSepherosa Ziehau free_bounce_zone(newtag);
326b2b3ffcdSSimon Schubert kfree(newtag, M_DEVBUF);
32737111f9cSSepherosa Ziehau } else {
328b2b3ffcdSSimon Schubert *dmat = newtag;
32937111f9cSSepherosa Ziehau }
330b2b3ffcdSSimon Schubert return error;
331b2b3ffcdSSimon Schubert }
332b2b3ffcdSSimon Schubert
333b2b3ffcdSSimon Schubert int
bus_dma_tag_destroy(bus_dma_tag_t dmat)334b2b3ffcdSSimon Schubert bus_dma_tag_destroy(bus_dma_tag_t dmat)
335b2b3ffcdSSimon Schubert {
336b2b3ffcdSSimon Schubert if (dmat != NULL) {
337b2b3ffcdSSimon Schubert if (dmat->map_count != 0)
338b2b3ffcdSSimon Schubert return (EBUSY);
339b2b3ffcdSSimon Schubert
3407dbe273fSSepherosa Ziehau free_bounce_zone(dmat);
341b2b3ffcdSSimon Schubert if (dmat->segments != NULL)
342b2b3ffcdSSimon Schubert kfree(dmat->segments, M_DEVBUF);
343b2b3ffcdSSimon Schubert kfree(dmat, M_DEVBUF);
344b2b3ffcdSSimon Schubert }
345b2b3ffcdSSimon Schubert return (0);
346b2b3ffcdSSimon Schubert }
347b2b3ffcdSSimon Schubert
348b2b3ffcdSSimon Schubert bus_size_t
bus_dma_tag_getmaxsize(bus_dma_tag_t tag)349b2b3ffcdSSimon Schubert bus_dma_tag_getmaxsize(bus_dma_tag_t tag)
350b2b3ffcdSSimon Schubert {
351b2b3ffcdSSimon Schubert return(tag->maxsize);
352b2b3ffcdSSimon Schubert }
353b2b3ffcdSSimon Schubert
354b2b3ffcdSSimon Schubert /*
355b2b3ffcdSSimon Schubert * Allocate a handle for mapping from kva/uva/physical
356b2b3ffcdSSimon Schubert * address space into bus device space.
357b2b3ffcdSSimon Schubert */
358b2b3ffcdSSimon Schubert int
bus_dmamap_create(bus_dma_tag_t dmat,int flags,bus_dmamap_t * mapp)359b2b3ffcdSSimon Schubert bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
360b2b3ffcdSSimon Schubert {
361b2b3ffcdSSimon Schubert int error;
362b2b3ffcdSSimon Schubert
363b2b3ffcdSSimon Schubert error = 0;
364b2b3ffcdSSimon Schubert
365b2b3ffcdSSimon Schubert if (dmat->segments == NULL) {
366b2b3ffcdSSimon Schubert KKASSERT(dmat->nsegments && dmat->nsegments < 16384);
367b2b3ffcdSSimon Schubert dmat->segments = kmalloc(sizeof(bus_dma_segment_t) *
368b2b3ffcdSSimon Schubert dmat->nsegments, M_DEVBUF, M_INTWAIT);
369b2b3ffcdSSimon Schubert }
370b2b3ffcdSSimon Schubert
371b2b3ffcdSSimon Schubert if (dmat->flags & BUS_DMA_COULD_BOUNCE) {
372b2b3ffcdSSimon Schubert struct bounce_zone *bz;
373b2b3ffcdSSimon Schubert int maxpages;
374b2b3ffcdSSimon Schubert
375b2b3ffcdSSimon Schubert /* Must bounce */
376b2b3ffcdSSimon Schubert
377b2b3ffcdSSimon Schubert if (dmat->bounce_zone == NULL) {
378b2b3ffcdSSimon Schubert error = alloc_bounce_zone(dmat);
379b2b3ffcdSSimon Schubert if (error)
380b2b3ffcdSSimon Schubert return error;
381b2b3ffcdSSimon Schubert }
382b2b3ffcdSSimon Schubert bz = dmat->bounce_zone;
383b2b3ffcdSSimon Schubert
384b2b3ffcdSSimon Schubert *mapp = kmalloc(sizeof(**mapp), M_DEVBUF, M_INTWAIT | M_ZERO);
385b2b3ffcdSSimon Schubert
386b2b3ffcdSSimon Schubert /* Initialize the new map */
387b2b3ffcdSSimon Schubert STAILQ_INIT(&((*mapp)->bpages));
388b2b3ffcdSSimon Schubert
389b2b3ffcdSSimon Schubert /*
390b2b3ffcdSSimon Schubert * Attempt to add pages to our pool on a per-instance
391b2b3ffcdSSimon Schubert * basis up to a sane limit.
392b2b3ffcdSSimon Schubert */
3937dbe273fSSepherosa Ziehau if (dmat->flags & BUS_DMA_ALLOCALL) {
3947dbe273fSSepherosa Ziehau maxpages = Maxmem - atop(dmat->lowaddr);
3957dbe273fSSepherosa Ziehau } else if (dmat->flags & BUS_DMA_BOUNCE_ALIGN) {
396b2b3ffcdSSimon Schubert maxpages = max_bounce_pages;
397b2b3ffcdSSimon Schubert } else {
398b2b3ffcdSSimon Schubert maxpages = MIN(max_bounce_pages,
399b2b3ffcdSSimon Schubert Maxmem - atop(dmat->lowaddr));
400b2b3ffcdSSimon Schubert }
4017dbe273fSSepherosa Ziehau if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0 ||
4027dbe273fSSepherosa Ziehau (dmat->map_count > 0 && bz->total_bpages < maxpages)) {
403b2b3ffcdSSimon Schubert int pages;
404b2b3ffcdSSimon Schubert
405b2b3ffcdSSimon Schubert if (flags & BUS_DMA_ONEBPAGE) {
406b2b3ffcdSSimon Schubert pages = 1;
407b2b3ffcdSSimon Schubert } else {
408b2b3ffcdSSimon Schubert pages = atop(round_page(dmat->maxsize));
409b2b3ffcdSSimon Schubert pages = MIN(maxpages - bz->total_bpages, pages);
410b2b3ffcdSSimon Schubert pages = MAX(pages, 1);
411b2b3ffcdSSimon Schubert }
412b2b3ffcdSSimon Schubert if (alloc_bounce_pages(dmat, pages, flags) < pages)
413b2b3ffcdSSimon Schubert error = ENOMEM;
414b2b3ffcdSSimon Schubert
415b2b3ffcdSSimon Schubert if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) {
4167dbe273fSSepherosa Ziehau if (!error &&
4177dbe273fSSepherosa Ziehau (dmat->flags & BUS_DMA_ALLOCALL) == 0)
418b2b3ffcdSSimon Schubert dmat->flags |= BUS_DMA_MIN_ALLOC_COMP;
419b2b3ffcdSSimon Schubert } else {
420b2b3ffcdSSimon Schubert error = 0;
421b2b3ffcdSSimon Schubert }
422b2b3ffcdSSimon Schubert }
423b2b3ffcdSSimon Schubert } else {
424b2b3ffcdSSimon Schubert *mapp = NULL;
425b2b3ffcdSSimon Schubert }
4260c3d5ef6SSepherosa Ziehau if (!error) {
427b2b3ffcdSSimon Schubert dmat->map_count++;
4280c3d5ef6SSepherosa Ziehau } else {
4290c3d5ef6SSepherosa Ziehau kfree(*mapp, M_DEVBUF);
4300c3d5ef6SSepherosa Ziehau *mapp = NULL;
4310c3d5ef6SSepherosa Ziehau }
432b2b3ffcdSSimon Schubert return error;
433b2b3ffcdSSimon Schubert }
434b2b3ffcdSSimon Schubert
435b2b3ffcdSSimon Schubert /*
436b2b3ffcdSSimon Schubert * Destroy a handle for mapping from kva/uva/physical
437b2b3ffcdSSimon Schubert * address space into bus device space.
438b2b3ffcdSSimon Schubert */
439b2b3ffcdSSimon Schubert int
bus_dmamap_destroy(bus_dma_tag_t dmat,bus_dmamap_t map)440b2b3ffcdSSimon Schubert bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
441b2b3ffcdSSimon Schubert {
4423124cc72SMatthew Dillon if (map != NULL && map != (void *)-1) {
443b2b3ffcdSSimon Schubert if (STAILQ_FIRST(&map->bpages) != NULL)
444b2b3ffcdSSimon Schubert return (EBUSY);
445b2b3ffcdSSimon Schubert kfree(map, M_DEVBUF);
446b2b3ffcdSSimon Schubert }
447b2b3ffcdSSimon Schubert dmat->map_count--;
448b2b3ffcdSSimon Schubert return (0);
449b2b3ffcdSSimon Schubert }
450b2b3ffcdSSimon Schubert
451b2b3ffcdSSimon Schubert static __inline bus_size_t
check_kmalloc(bus_dma_tag_t dmat,const void * vaddr0,int verify)452b2b3ffcdSSimon Schubert check_kmalloc(bus_dma_tag_t dmat, const void *vaddr0, int verify)
453b2b3ffcdSSimon Schubert {
454b2b3ffcdSSimon Schubert bus_size_t maxsize = 0;
455b2b3ffcdSSimon Schubert uintptr_t vaddr = (uintptr_t)vaddr0;
456b2b3ffcdSSimon Schubert
457b2b3ffcdSSimon Schubert if ((vaddr ^ (vaddr + dmat->maxsize - 1)) & ~PAGE_MASK) {
458b2b3ffcdSSimon Schubert if (verify)
459cd12dbe8SSepherosa Ziehau panic("boundary check failed\n");
460b2b3ffcdSSimon Schubert maxsize = dmat->maxsize;
461b2b3ffcdSSimon Schubert }
462b2b3ffcdSSimon Schubert if (vaddr & (dmat->alignment - 1)) {
463b2b3ffcdSSimon Schubert if (verify)
464cd12dbe8SSepherosa Ziehau panic("alignment check failed\n");
465b2b3ffcdSSimon Schubert if (dmat->maxsize < dmat->alignment)
466b2b3ffcdSSimon Schubert maxsize = dmat->alignment;
467b2b3ffcdSSimon Schubert else
468b2b3ffcdSSimon Schubert maxsize = dmat->maxsize;
469b2b3ffcdSSimon Schubert }
470b2b3ffcdSSimon Schubert return maxsize;
471b2b3ffcdSSimon Schubert }
472b2b3ffcdSSimon Schubert
473b2b3ffcdSSimon Schubert /*
474b2b3ffcdSSimon Schubert * Allocate a piece of memory that can be efficiently mapped into
475b2b3ffcdSSimon Schubert * bus device space based on the constraints lited in the dma tag.
476b2b3ffcdSSimon Schubert *
4773124cc72SMatthew Dillon * Use *mapp to record whether we were able to use kmalloc()
4783124cc72SMatthew Dillon * or whether we had to use contigmalloc().
479b2b3ffcdSSimon Schubert */
480b2b3ffcdSSimon Schubert int
bus_dmamem_alloc(bus_dma_tag_t dmat,void ** vaddr,int flags,bus_dmamap_t * mapp)481b2b3ffcdSSimon Schubert bus_dmamem_alloc(bus_dma_tag_t dmat, void **vaddr, int flags,
482b2b3ffcdSSimon Schubert bus_dmamap_t *mapp)
483b2b3ffcdSSimon Schubert {
48410427daeSFrançois Tigeot vm_memattr_t attr;
485b2b3ffcdSSimon Schubert int mflags;
486b2b3ffcdSSimon Schubert
487b2b3ffcdSSimon Schubert /* If we succeed, no mapping/bouncing will be required */
488b2b3ffcdSSimon Schubert *mapp = NULL;
489b2b3ffcdSSimon Schubert
490b2b3ffcdSSimon Schubert if (dmat->segments == NULL) {
491b2b3ffcdSSimon Schubert KKASSERT(dmat->nsegments < 16384);
492b2b3ffcdSSimon Schubert dmat->segments = kmalloc(sizeof(bus_dma_segment_t) *
493b2b3ffcdSSimon Schubert dmat->nsegments, M_DEVBUF, M_INTWAIT);
494b2b3ffcdSSimon Schubert }
495b2b3ffcdSSimon Schubert
496b2b3ffcdSSimon Schubert if (flags & BUS_DMA_NOWAIT)
497b2b3ffcdSSimon Schubert mflags = M_NOWAIT;
498b2b3ffcdSSimon Schubert else
499b2b3ffcdSSimon Schubert mflags = M_WAITOK;
500b2b3ffcdSSimon Schubert if (flags & BUS_DMA_ZERO)
501b2b3ffcdSSimon Schubert mflags |= M_ZERO;
50210427daeSFrançois Tigeot if (flags & BUS_DMA_NOCACHE)
50310427daeSFrançois Tigeot attr = VM_MEMATTR_UNCACHEABLE;
50410427daeSFrançois Tigeot else
50510427daeSFrançois Tigeot attr = VM_MEMATTR_DEFAULT;
506b2b3ffcdSSimon Schubert
50710427daeSFrançois Tigeot /* XXX must alloc with correct mem attribute here */
5083124cc72SMatthew Dillon if (BUS_DMAMEM_KMALLOC(dmat) && attr == VM_MEMATTR_DEFAULT) {
509b2b3ffcdSSimon Schubert bus_size_t maxsize;
510b2b3ffcdSSimon Schubert
511b2b3ffcdSSimon Schubert *vaddr = kmalloc(dmat->maxsize, M_DEVBUF, mflags);
512b2b3ffcdSSimon Schubert
513b2b3ffcdSSimon Schubert /*
514b2b3ffcdSSimon Schubert * XXX
515b2b3ffcdSSimon Schubert * Check whether the allocation
516b2b3ffcdSSimon Schubert * - crossed a page boundary
517b2b3ffcdSSimon Schubert * - was not aligned
518b2b3ffcdSSimon Schubert * Retry with power-of-2 alignment in the above cases.
519b2b3ffcdSSimon Schubert */
520b2b3ffcdSSimon Schubert maxsize = check_kmalloc(dmat, *vaddr, 0);
521b2b3ffcdSSimon Schubert if (maxsize) {
522b2b3ffcdSSimon Schubert kfree(*vaddr, M_DEVBUF);
5231e57f867SSepherosa Ziehau *vaddr = kmalloc(maxsize, M_DEVBUF,
5241e57f867SSepherosa Ziehau mflags | M_POWEROF2);
525b2b3ffcdSSimon Schubert check_kmalloc(dmat, *vaddr, 1);
526b2b3ffcdSSimon Schubert }
527b2b3ffcdSSimon Schubert } else {
528b2b3ffcdSSimon Schubert /*
529b2b3ffcdSSimon Schubert * XXX Use Contigmalloc until it is merged into this facility
530b2b3ffcdSSimon Schubert * and handles multi-seg allocations. Nobody is doing
531b2b3ffcdSSimon Schubert * multi-seg allocations yet though.
532b2b3ffcdSSimon Schubert */
533b2b3ffcdSSimon Schubert *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags,
5343124cc72SMatthew Dillon 0ul, dmat->lowaddr,
5353124cc72SMatthew Dillon dmat->alignment, dmat->boundary);
5363124cc72SMatthew Dillon *mapp = (void *)-1;
537b2b3ffcdSSimon Schubert }
538b2b3ffcdSSimon Schubert if (*vaddr == NULL)
539b2b3ffcdSSimon Schubert return (ENOMEM);
54010427daeSFrançois Tigeot
5413124cc72SMatthew Dillon if (attr != VM_MEMATTR_DEFAULT) {
5423124cc72SMatthew Dillon pmap_change_attr((vm_offset_t)(*vaddr),
5433124cc72SMatthew Dillon dmat->maxsize / PAGE_SIZE, attr);
5443124cc72SMatthew Dillon }
545b2b3ffcdSSimon Schubert return (0);
546b2b3ffcdSSimon Schubert }
547b2b3ffcdSSimon Schubert
548b2b3ffcdSSimon Schubert /*
549b2b3ffcdSSimon Schubert * Free a piece of memory and it's allociated dmamap, that was allocated
550b2b3ffcdSSimon Schubert * via bus_dmamem_alloc. Make the same choice for free/contigfree.
551b2b3ffcdSSimon Schubert */
552b2b3ffcdSSimon Schubert void
bus_dmamem_free(bus_dma_tag_t dmat,void * vaddr,bus_dmamap_t map)553b2b3ffcdSSimon Schubert bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
554b2b3ffcdSSimon Schubert {
555b2b3ffcdSSimon Schubert /*
556b2b3ffcdSSimon Schubert * dmamem does not need to be bounced, so the map should be
557b2b3ffcdSSimon Schubert * NULL
558b2b3ffcdSSimon Schubert */
5593124cc72SMatthew Dillon if (map != NULL && map != (void *)-1)
560ed20d0e3SSascha Wildner panic("bus_dmamem_free: Invalid map freed");
5613124cc72SMatthew Dillon if (map == NULL)
562b2b3ffcdSSimon Schubert kfree(vaddr, M_DEVBUF);
563b2b3ffcdSSimon Schubert else
564b2b3ffcdSSimon Schubert contigfree(vaddr, dmat->maxsize, M_DEVBUF);
565b2b3ffcdSSimon Schubert }
566b2b3ffcdSSimon Schubert
567b2b3ffcdSSimon Schubert static __inline vm_paddr_t
_bus_dma_extract(pmap_t pmap,vm_offset_t vaddr)568b2b3ffcdSSimon Schubert _bus_dma_extract(pmap_t pmap, vm_offset_t vaddr)
569b2b3ffcdSSimon Schubert {
570b2b3ffcdSSimon Schubert if (pmap)
57176f1911eSMatthew Dillon return pmap_extract(pmap, vaddr, NULL);
572b2b3ffcdSSimon Schubert else
573b2b3ffcdSSimon Schubert return pmap_kextract(vaddr);
574b2b3ffcdSSimon Schubert }
575b2b3ffcdSSimon Schubert
576b2b3ffcdSSimon Schubert /*
577b2b3ffcdSSimon Schubert * Utility function to load a linear buffer. lastaddrp holds state
578b2b3ffcdSSimon Schubert * between invocations (for multiple-buffer loads). segp contains
579b2b3ffcdSSimon Schubert * the segment following the starting one on entrace, and the ending
580b2b3ffcdSSimon Schubert * segment on exit. first indicates if this is the first invocation
581b2b3ffcdSSimon Schubert * of this function.
582b2b3ffcdSSimon Schubert */
583b2b3ffcdSSimon Schubert static int
_bus_dmamap_load_buffer(bus_dma_tag_t dmat,bus_dmamap_t map,void * buf,bus_size_t buflen,bus_dma_segment_t * segments,int nsegments,pmap_t pmap,int flags,vm_paddr_t * lastpaddrp,int * segp,int first)584b2b3ffcdSSimon Schubert _bus_dmamap_load_buffer(bus_dma_tag_t dmat,
585b2b3ffcdSSimon Schubert bus_dmamap_t map,
586b2b3ffcdSSimon Schubert void *buf, bus_size_t buflen,
587b2b3ffcdSSimon Schubert bus_dma_segment_t *segments,
588b2b3ffcdSSimon Schubert int nsegments,
589b2b3ffcdSSimon Schubert pmap_t pmap,
590b2b3ffcdSSimon Schubert int flags,
591b2b3ffcdSSimon Schubert vm_paddr_t *lastpaddrp,
592b2b3ffcdSSimon Schubert int *segp,
593b2b3ffcdSSimon Schubert int first)
594b2b3ffcdSSimon Schubert {
595b2b3ffcdSSimon Schubert vm_offset_t vaddr;
596b2b3ffcdSSimon Schubert vm_paddr_t paddr, nextpaddr;
597b2b3ffcdSSimon Schubert bus_dma_segment_t *sg;
598b2b3ffcdSSimon Schubert bus_addr_t bmask;
599b2b3ffcdSSimon Schubert int seg, error = 0;
600b2b3ffcdSSimon Schubert
6013124cc72SMatthew Dillon if (map == NULL || map == (void *)-1)
602b2b3ffcdSSimon Schubert map = &nobounce_dmamap;
603b2b3ffcdSSimon Schubert
604b2b3ffcdSSimon Schubert #ifdef INVARIANTS
605b2b3ffcdSSimon Schubert if (dmat->flags & BUS_DMA_ALIGNED)
606b2b3ffcdSSimon Schubert KKASSERT(((uintptr_t)buf & (dmat->alignment - 1)) == 0);
607b2b3ffcdSSimon Schubert #endif
608b2b3ffcdSSimon Schubert
609b2b3ffcdSSimon Schubert /*
610b2b3ffcdSSimon Schubert * If we are being called during a callback, pagesneeded will
611b2b3ffcdSSimon Schubert * be non-zero, so we can avoid doing the work twice.
612b2b3ffcdSSimon Schubert */
613b2b3ffcdSSimon Schubert if ((dmat->flags & BUS_DMA_COULD_BOUNCE) &&
614b2b3ffcdSSimon Schubert map != &nobounce_dmamap && map->pagesneeded == 0) {
615b2b3ffcdSSimon Schubert vm_offset_t vendaddr;
616b2b3ffcdSSimon Schubert
617b2b3ffcdSSimon Schubert /*
618b2b3ffcdSSimon Schubert * Count the number of bounce pages
619b2b3ffcdSSimon Schubert * needed in order to complete this transfer
620b2b3ffcdSSimon Schubert */
621b2b3ffcdSSimon Schubert vaddr = (vm_offset_t)buf;
622b2b3ffcdSSimon Schubert vendaddr = (vm_offset_t)buf + buflen;
623b2b3ffcdSSimon Schubert
624b2b3ffcdSSimon Schubert while (vaddr < vendaddr) {
625b2b3ffcdSSimon Schubert paddr = _bus_dma_extract(pmap, vaddr);
626*030b0c8cSMichael Neumann if (addr_needs_bounce(dmat, paddr))
627b2b3ffcdSSimon Schubert map->pagesneeded++;
62806bb314fSSascha Wildner vaddr += (PAGE_SIZE - (vaddr & PAGE_MASK));
629b2b3ffcdSSimon Schubert }
630b2b3ffcdSSimon Schubert }
631b2b3ffcdSSimon Schubert
632b2b3ffcdSSimon Schubert /* Reserve Necessary Bounce Pages */
633b2b3ffcdSSimon Schubert if (map->pagesneeded != 0) {
634b2b3ffcdSSimon Schubert struct bounce_zone *bz;
635b2b3ffcdSSimon Schubert
636b2b3ffcdSSimon Schubert bz = dmat->bounce_zone;
637b2b3ffcdSSimon Schubert BZ_LOCK(bz);
638b2b3ffcdSSimon Schubert if (flags & BUS_DMA_NOWAIT) {
639b2b3ffcdSSimon Schubert if (reserve_bounce_pages(dmat, map, 0) != 0) {
640b2b3ffcdSSimon Schubert BZ_UNLOCK(bz);
641b2b3ffcdSSimon Schubert error = ENOMEM;
642b2b3ffcdSSimon Schubert goto free_bounce;
643b2b3ffcdSSimon Schubert }
644b2b3ffcdSSimon Schubert } else {
645b2b3ffcdSSimon Schubert if (reserve_bounce_pages(dmat, map, 1) != 0) {
646b2b3ffcdSSimon Schubert /* Queue us for resources */
647b2b3ffcdSSimon Schubert map->dmat = dmat;
648b2b3ffcdSSimon Schubert map->buf = buf;
649b2b3ffcdSSimon Schubert map->buflen = buflen;
650b2b3ffcdSSimon Schubert
651b2b3ffcdSSimon Schubert STAILQ_INSERT_TAIL(
652b2b3ffcdSSimon Schubert &dmat->bounce_zone->bounce_map_waitinglist,
653b2b3ffcdSSimon Schubert map, links);
654b2b3ffcdSSimon Schubert BZ_UNLOCK(bz);
655b2b3ffcdSSimon Schubert
656b2b3ffcdSSimon Schubert return (EINPROGRESS);
657b2b3ffcdSSimon Schubert }
658b2b3ffcdSSimon Schubert }
659b2b3ffcdSSimon Schubert BZ_UNLOCK(bz);
660b2b3ffcdSSimon Schubert }
661b2b3ffcdSSimon Schubert
662b2b3ffcdSSimon Schubert KKASSERT(*segp >= 1 && *segp <= nsegments);
663b2b3ffcdSSimon Schubert seg = *segp;
664b2b3ffcdSSimon Schubert sg = &segments[seg - 1];
665b2b3ffcdSSimon Schubert
666b2b3ffcdSSimon Schubert vaddr = (vm_offset_t)buf;
667b2b3ffcdSSimon Schubert nextpaddr = *lastpaddrp;
668b2b3ffcdSSimon Schubert bmask = ~(dmat->boundary - 1); /* note: will be 0 if boundary is 0 */
669b2b3ffcdSSimon Schubert
670b2b3ffcdSSimon Schubert /* force at least one segment */
671b2b3ffcdSSimon Schubert do {
672b2b3ffcdSSimon Schubert bus_size_t size;
673b2b3ffcdSSimon Schubert
674b2b3ffcdSSimon Schubert /*
675b2b3ffcdSSimon Schubert * Per-page main loop
676b2b3ffcdSSimon Schubert */
677b2b3ffcdSSimon Schubert paddr = _bus_dma_extract(pmap, vaddr);
678b2b3ffcdSSimon Schubert size = PAGE_SIZE - (paddr & PAGE_MASK);
679b2b3ffcdSSimon Schubert if (size > buflen)
680b2b3ffcdSSimon Schubert size = buflen;
681*030b0c8cSMichael Neumann if (map->pagesneeded != 0 && addr_needs_bounce(dmat, paddr)) {
682b2b3ffcdSSimon Schubert /*
68333025e31SMatthew Dillon * NOTE: paddr may have different in-page offset,
68433025e31SMatthew Dillon * unless BUS_DMA_KEEP_PG_OFFSET is set.
685b2b3ffcdSSimon Schubert */
68633025e31SMatthew Dillon paddr = add_bounce_page(dmat, map, vaddr, &size);
687b2b3ffcdSSimon Schubert }
688b2b3ffcdSSimon Schubert
689b2b3ffcdSSimon Schubert /*
690b2b3ffcdSSimon Schubert * Fill in the bus_dma_segment
691b2b3ffcdSSimon Schubert */
692b2b3ffcdSSimon Schubert if (first) {
693b2b3ffcdSSimon Schubert sg->ds_addr = paddr;
694b2b3ffcdSSimon Schubert sg->ds_len = size;
695b2b3ffcdSSimon Schubert first = 0;
696b2b3ffcdSSimon Schubert } else if (paddr == nextpaddr) {
697b2b3ffcdSSimon Schubert sg->ds_len += size;
698b2b3ffcdSSimon Schubert } else {
699b2b3ffcdSSimon Schubert sg++;
700b2b3ffcdSSimon Schubert seg++;
701b2b3ffcdSSimon Schubert if (seg > nsegments)
702b2b3ffcdSSimon Schubert break;
703b2b3ffcdSSimon Schubert sg->ds_addr = paddr;
704b2b3ffcdSSimon Schubert sg->ds_len = size;
705b2b3ffcdSSimon Schubert }
706b2b3ffcdSSimon Schubert nextpaddr = paddr + size;
707b2b3ffcdSSimon Schubert
708b2b3ffcdSSimon Schubert /*
709b2b3ffcdSSimon Schubert * Handle maxsegsz and boundary issues with a nested loop
710b2b3ffcdSSimon Schubert */
711b2b3ffcdSSimon Schubert for (;;) {
712b2b3ffcdSSimon Schubert bus_size_t tmpsize;
713b2b3ffcdSSimon Schubert
714b2b3ffcdSSimon Schubert /*
715b2b3ffcdSSimon Schubert * Limit to the boundary and maximum segment size
716b2b3ffcdSSimon Schubert */
717b2b3ffcdSSimon Schubert if (((nextpaddr - 1) ^ sg->ds_addr) & bmask) {
718b2b3ffcdSSimon Schubert tmpsize = dmat->boundary -
719b2b3ffcdSSimon Schubert (sg->ds_addr & ~bmask);
720b2b3ffcdSSimon Schubert if (tmpsize > dmat->maxsegsz)
721b2b3ffcdSSimon Schubert tmpsize = dmat->maxsegsz;
722b2b3ffcdSSimon Schubert KKASSERT(tmpsize < sg->ds_len);
723b2b3ffcdSSimon Schubert } else if (sg->ds_len > dmat->maxsegsz) {
724b2b3ffcdSSimon Schubert tmpsize = dmat->maxsegsz;
725b2b3ffcdSSimon Schubert } else {
726b2b3ffcdSSimon Schubert break;
727b2b3ffcdSSimon Schubert }
728b2b3ffcdSSimon Schubert
729b2b3ffcdSSimon Schubert /*
730b2b3ffcdSSimon Schubert * Futz, split the data into a new segment.
731b2b3ffcdSSimon Schubert */
732b2b3ffcdSSimon Schubert if (seg >= nsegments)
733b2b3ffcdSSimon Schubert goto fail;
734b2b3ffcdSSimon Schubert sg[1].ds_len = sg[0].ds_len - tmpsize;
735b2b3ffcdSSimon Schubert sg[1].ds_addr = sg[0].ds_addr + tmpsize;
736b2b3ffcdSSimon Schubert sg[0].ds_len = tmpsize;
737b2b3ffcdSSimon Schubert sg++;
738b2b3ffcdSSimon Schubert seg++;
739b2b3ffcdSSimon Schubert }
740b2b3ffcdSSimon Schubert
741b2b3ffcdSSimon Schubert /*
742b2b3ffcdSSimon Schubert * Adjust for loop
743b2b3ffcdSSimon Schubert */
744b2b3ffcdSSimon Schubert buflen -= size;
745b2b3ffcdSSimon Schubert vaddr += size;
746b2b3ffcdSSimon Schubert } while (buflen > 0);
747b2b3ffcdSSimon Schubert fail:
748b2b3ffcdSSimon Schubert if (buflen != 0)
749b2b3ffcdSSimon Schubert error = EFBIG;
750b2b3ffcdSSimon Schubert
751b2b3ffcdSSimon Schubert *segp = seg;
752b2b3ffcdSSimon Schubert *lastpaddrp = nextpaddr;
753b2b3ffcdSSimon Schubert
754b2b3ffcdSSimon Schubert free_bounce:
755b2b3ffcdSSimon Schubert if (error && (dmat->flags & BUS_DMA_COULD_BOUNCE) &&
756b2b3ffcdSSimon Schubert map != &nobounce_dmamap) {
757b2b3ffcdSSimon Schubert _bus_dmamap_unload(dmat, map);
758b2b3ffcdSSimon Schubert return_bounce_pages(dmat, map);
759b2b3ffcdSSimon Schubert }
760b2b3ffcdSSimon Schubert return error;
761b2b3ffcdSSimon Schubert }
762b2b3ffcdSSimon Schubert
763b2b3ffcdSSimon Schubert /*
764b2b3ffcdSSimon Schubert * Map the buffer buf into bus space using the dmamap map.
765b2b3ffcdSSimon Schubert */
766b2b3ffcdSSimon Schubert int
bus_dmamap_load(bus_dma_tag_t dmat,bus_dmamap_t map,void * buf,bus_size_t buflen,bus_dmamap_callback_t * callback,void * callback_arg,int flags)767b2b3ffcdSSimon Schubert bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
768b2b3ffcdSSimon Schubert bus_size_t buflen, bus_dmamap_callback_t *callback,
769b2b3ffcdSSimon Schubert void *callback_arg, int flags)
770b2b3ffcdSSimon Schubert {
771b2b3ffcdSSimon Schubert bus_dma_segment_t cache_segments[BUS_DMA_CACHE_SEGMENTS];
772b2b3ffcdSSimon Schubert bus_dma_segment_t *segments;
773b2b3ffcdSSimon Schubert vm_paddr_t lastaddr = 0;
774b2b3ffcdSSimon Schubert int error, nsegs = 1;
775b2b3ffcdSSimon Schubert
7763124cc72SMatthew Dillon if (map != NULL && map != (void *)-1) {
777b2b3ffcdSSimon Schubert /*
778b2b3ffcdSSimon Schubert * XXX
779b2b3ffcdSSimon Schubert * Follow old semantics. Once all of the callers are fixed,
780b2b3ffcdSSimon Schubert * we should get rid of these internal flag "adjustment".
781b2b3ffcdSSimon Schubert */
782b2b3ffcdSSimon Schubert flags &= ~BUS_DMA_NOWAIT;
783b2b3ffcdSSimon Schubert flags |= BUS_DMA_WAITOK;
784b2b3ffcdSSimon Schubert
785b2b3ffcdSSimon Schubert map->callback = callback;
786b2b3ffcdSSimon Schubert map->callback_arg = callback_arg;
787b2b3ffcdSSimon Schubert }
788b2b3ffcdSSimon Schubert
789b2b3ffcdSSimon Schubert segments = bus_dma_tag_lock(dmat, cache_segments);
790b2b3ffcdSSimon Schubert error = _bus_dmamap_load_buffer(dmat, map, buf, buflen,
791b2b3ffcdSSimon Schubert segments, dmat->nsegments,
792b2b3ffcdSSimon Schubert NULL, flags, &lastaddr, &nsegs, 1);
793b2b3ffcdSSimon Schubert if (error == EINPROGRESS) {
7947dbe273fSSepherosa Ziehau KKASSERT((dmat->flags &
7957dbe273fSSepherosa Ziehau (BUS_DMA_PRIVBZONE | BUS_DMA_ALLOCALL)) !=
7967dbe273fSSepherosa Ziehau (BUS_DMA_PRIVBZONE | BUS_DMA_ALLOCALL));
797c26842b6SSepherosa Ziehau
798c26842b6SSepherosa Ziehau if (dmat->flags & BUS_DMA_PROTECTED)
799ed20d0e3SSascha Wildner panic("protected dmamap callback will be defered");
800c26842b6SSepherosa Ziehau
801b2b3ffcdSSimon Schubert bus_dma_tag_unlock(dmat);
802b2b3ffcdSSimon Schubert return error;
803b2b3ffcdSSimon Schubert }
804b2b3ffcdSSimon Schubert callback(callback_arg, segments, nsegs, error);
805b2b3ffcdSSimon Schubert bus_dma_tag_unlock(dmat);
806b2b3ffcdSSimon Schubert return 0;
807b2b3ffcdSSimon Schubert }
808b2b3ffcdSSimon Schubert
809537b9048SSascha Wildner /*
810537b9048SSascha Wildner * Like _bus_dmamap_load(), but for ccb.
811537b9048SSascha Wildner */
8129eb6f109SSepherosa Ziehau int
bus_dmamap_load_ccb(bus_dma_tag_t dmat,bus_dmamap_t map,union ccb * ccb,bus_dmamap_callback_t * callback,void * callback_arg,int flags)8139eb6f109SSepherosa Ziehau bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
8149eb6f109SSepherosa Ziehau bus_dmamap_callback_t *callback, void *callback_arg, int flags)
8159eb6f109SSepherosa Ziehau {
8169eb6f109SSepherosa Ziehau const struct ccb_scsiio *csio;
817f5fbbb55SSascha Wildner struct ccb_hdr *ccb_h;
8189eb6f109SSepherosa Ziehau
819f5fbbb55SSascha Wildner ccb_h = &ccb->ccb_h;
820f5fbbb55SSascha Wildner KASSERT(ccb_h->func_code == XPT_SCSI_IO ||
821f5fbbb55SSascha Wildner ccb_h->func_code == XPT_CONT_TARGET_IO,
822f5fbbb55SSascha Wildner ("invalid ccb func_code %u", ccb_h->func_code));
823f5fbbb55SSascha Wildner if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_NONE) {
824f5fbbb55SSascha Wildner callback(callback_arg, NULL, 0, 0);
825f5fbbb55SSascha Wildner return 0;
826f5fbbb55SSascha Wildner }
8279eb6f109SSepherosa Ziehau csio = &ccb->csio;
8289eb6f109SSepherosa Ziehau
8299eb6f109SSepherosa Ziehau return (bus_dmamap_load(dmat, map, csio->data_ptr, csio->dxfer_len,
8309eb6f109SSepherosa Ziehau callback, callback_arg, flags));
8319eb6f109SSepherosa Ziehau }
8329eb6f109SSepherosa Ziehau
833b2b3ffcdSSimon Schubert /*
834b2b3ffcdSSimon Schubert * Like _bus_dmamap_load(), but for mbufs.
835b2b3ffcdSSimon Schubert */
836b2b3ffcdSSimon Schubert int
bus_dmamap_load_mbuf(bus_dma_tag_t dmat,bus_dmamap_t map,struct mbuf * m0,bus_dmamap_callback2_t * callback,void * callback_arg,int flags)837b2b3ffcdSSimon Schubert bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
838b2b3ffcdSSimon Schubert struct mbuf *m0,
839b2b3ffcdSSimon Schubert bus_dmamap_callback2_t *callback, void *callback_arg,
840b2b3ffcdSSimon Schubert int flags)
841b2b3ffcdSSimon Schubert {
842b2b3ffcdSSimon Schubert bus_dma_segment_t cache_segments[BUS_DMA_CACHE_SEGMENTS];
843b2b3ffcdSSimon Schubert bus_dma_segment_t *segments;
844b2b3ffcdSSimon Schubert int nsegs, error;
845b2b3ffcdSSimon Schubert
846b2b3ffcdSSimon Schubert /*
847b2b3ffcdSSimon Schubert * XXX
848b2b3ffcdSSimon Schubert * Follow old semantics. Once all of the callers are fixed,
849b2b3ffcdSSimon Schubert * we should get rid of these internal flag "adjustment".
850b2b3ffcdSSimon Schubert */
851b2b3ffcdSSimon Schubert flags &= ~BUS_DMA_WAITOK;
852b2b3ffcdSSimon Schubert flags |= BUS_DMA_NOWAIT;
853b2b3ffcdSSimon Schubert
854b2b3ffcdSSimon Schubert segments = bus_dma_tag_lock(dmat, cache_segments);
855b2b3ffcdSSimon Schubert error = bus_dmamap_load_mbuf_segment(dmat, map, m0,
856b2b3ffcdSSimon Schubert segments, dmat->nsegments, &nsegs, flags);
857b2b3ffcdSSimon Schubert if (error) {
858b2b3ffcdSSimon Schubert /* force "no valid mappings" in callback */
859b2b3ffcdSSimon Schubert callback(callback_arg, segments, 0,
860b2b3ffcdSSimon Schubert 0, error);
861b2b3ffcdSSimon Schubert } else {
862b2b3ffcdSSimon Schubert callback(callback_arg, segments, nsegs,
863b2b3ffcdSSimon Schubert m0->m_pkthdr.len, error);
864b2b3ffcdSSimon Schubert }
865b2b3ffcdSSimon Schubert bus_dma_tag_unlock(dmat);
866b2b3ffcdSSimon Schubert return error;
867b2b3ffcdSSimon Schubert }
868b2b3ffcdSSimon Schubert
869b2b3ffcdSSimon Schubert int
bus_dmamap_load_mbuf_segment(bus_dma_tag_t dmat,bus_dmamap_t map,struct mbuf * m0,bus_dma_segment_t * segs,int maxsegs,int * nsegs,int flags)870b2b3ffcdSSimon Schubert bus_dmamap_load_mbuf_segment(bus_dma_tag_t dmat, bus_dmamap_t map,
871b2b3ffcdSSimon Schubert struct mbuf *m0,
872b2b3ffcdSSimon Schubert bus_dma_segment_t *segs, int maxsegs,
873b2b3ffcdSSimon Schubert int *nsegs, int flags)
874b2b3ffcdSSimon Schubert {
875b2b3ffcdSSimon Schubert int error;
876b2b3ffcdSSimon Schubert
877b2b3ffcdSSimon Schubert M_ASSERTPKTHDR(m0);
878b2b3ffcdSSimon Schubert
879ed20d0e3SSascha Wildner KASSERT(maxsegs >= 1, ("invalid maxsegs %d", maxsegs));
880b2b3ffcdSSimon Schubert KASSERT(maxsegs <= dmat->nsegments,
881ed20d0e3SSascha Wildner ("%d too many segments, dmat only supports %d segments",
882b2b3ffcdSSimon Schubert maxsegs, dmat->nsegments));
883b2b3ffcdSSimon Schubert KASSERT(flags & BUS_DMA_NOWAIT,
884ed20d0e3SSascha Wildner ("only BUS_DMA_NOWAIT is supported"));
885b2b3ffcdSSimon Schubert
886b2b3ffcdSSimon Schubert if (m0->m_pkthdr.len <= dmat->maxsize) {
887b2b3ffcdSSimon Schubert int first = 1;
888b2b3ffcdSSimon Schubert vm_paddr_t lastaddr = 0;
889b2b3ffcdSSimon Schubert struct mbuf *m;
890b2b3ffcdSSimon Schubert
891b2b3ffcdSSimon Schubert *nsegs = 1;
892b2b3ffcdSSimon Schubert error = 0;
893b2b3ffcdSSimon Schubert for (m = m0; m != NULL && error == 0; m = m->m_next) {
894b2b3ffcdSSimon Schubert if (m->m_len == 0)
895b2b3ffcdSSimon Schubert continue;
896b2b3ffcdSSimon Schubert
897b2b3ffcdSSimon Schubert error = _bus_dmamap_load_buffer(dmat, map,
898b2b3ffcdSSimon Schubert m->m_data, m->m_len,
899b2b3ffcdSSimon Schubert segs, maxsegs,
900b2b3ffcdSSimon Schubert NULL, flags, &lastaddr,
901b2b3ffcdSSimon Schubert nsegs, first);
902b2b3ffcdSSimon Schubert if (error == ENOMEM && !first) {
903b2b3ffcdSSimon Schubert /*
904b2b3ffcdSSimon Schubert * Out of bounce pages due to too many
905b2b3ffcdSSimon Schubert * fragments in the mbuf chain; return
906b2b3ffcdSSimon Schubert * EFBIG instead.
907b2b3ffcdSSimon Schubert */
908b2b3ffcdSSimon Schubert error = EFBIG;
90933025e31SMatthew Dillon break;
910b2b3ffcdSSimon Schubert }
911b2b3ffcdSSimon Schubert first = 0;
912b2b3ffcdSSimon Schubert }
913b2b3ffcdSSimon Schubert #ifdef INVARIANTS
914b2b3ffcdSSimon Schubert if (!error)
915b2b3ffcdSSimon Schubert KKASSERT(*nsegs <= maxsegs && *nsegs >= 1);
916b2b3ffcdSSimon Schubert #endif
917b2b3ffcdSSimon Schubert } else {
918b2b3ffcdSSimon Schubert *nsegs = 0;
919b2b3ffcdSSimon Schubert error = EINVAL;
920b2b3ffcdSSimon Schubert }
921b2b3ffcdSSimon Schubert KKASSERT(error != EINPROGRESS);
922b2b3ffcdSSimon Schubert return error;
923b2b3ffcdSSimon Schubert }
924b2b3ffcdSSimon Schubert
925b2b3ffcdSSimon Schubert /*
926b2b3ffcdSSimon Schubert * Like _bus_dmamap_load(), but for uios.
927b2b3ffcdSSimon Schubert */
928b2b3ffcdSSimon Schubert int
bus_dmamap_load_uio(bus_dma_tag_t dmat,bus_dmamap_t map,struct uio * uio,bus_dmamap_callback2_t * callback,void * callback_arg,int flags)929b2b3ffcdSSimon Schubert bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
930b2b3ffcdSSimon Schubert struct uio *uio,
931b2b3ffcdSSimon Schubert bus_dmamap_callback2_t *callback, void *callback_arg,
932b2b3ffcdSSimon Schubert int flags)
933b2b3ffcdSSimon Schubert {
934b2b3ffcdSSimon Schubert vm_paddr_t lastaddr;
935b2b3ffcdSSimon Schubert int nsegs, error, first, i;
936b2b3ffcdSSimon Schubert bus_size_t resid;
937b2b3ffcdSSimon Schubert struct iovec *iov;
938b2b3ffcdSSimon Schubert pmap_t pmap;
939b2b3ffcdSSimon Schubert bus_dma_segment_t cache_segments[BUS_DMA_CACHE_SEGMENTS];
940b2b3ffcdSSimon Schubert bus_dma_segment_t *segments;
941b2b3ffcdSSimon Schubert bus_dma_segment_t *segs;
942b2b3ffcdSSimon Schubert int nsegs_left;
943b2b3ffcdSSimon Schubert
944b2b3ffcdSSimon Schubert if (dmat->nsegments <= BUS_DMA_CACHE_SEGMENTS)
945b2b3ffcdSSimon Schubert segments = cache_segments;
946b2b3ffcdSSimon Schubert else
947b2b3ffcdSSimon Schubert segments = kmalloc(sizeof(bus_dma_segment_t) * dmat->nsegments,
948b2b3ffcdSSimon Schubert M_DEVBUF, M_WAITOK | M_ZERO);
949b2b3ffcdSSimon Schubert
950b2b3ffcdSSimon Schubert /*
951b2b3ffcdSSimon Schubert * XXX
952b2b3ffcdSSimon Schubert * Follow old semantics. Once all of the callers are fixed,
953b2b3ffcdSSimon Schubert * we should get rid of these internal flag "adjustment".
954b2b3ffcdSSimon Schubert */
955b2b3ffcdSSimon Schubert flags &= ~BUS_DMA_WAITOK;
956b2b3ffcdSSimon Schubert flags |= BUS_DMA_NOWAIT;
957b2b3ffcdSSimon Schubert
958b2b3ffcdSSimon Schubert resid = (bus_size_t)uio->uio_resid;
959b2b3ffcdSSimon Schubert iov = uio->uio_iov;
960b2b3ffcdSSimon Schubert
961b2b3ffcdSSimon Schubert segs = segments;
962b2b3ffcdSSimon Schubert nsegs_left = dmat->nsegments;
963b2b3ffcdSSimon Schubert
964b2b3ffcdSSimon Schubert if (uio->uio_segflg == UIO_USERSPACE) {
965b2b3ffcdSSimon Schubert struct thread *td;
966b2b3ffcdSSimon Schubert
967b2b3ffcdSSimon Schubert td = uio->uio_td;
968b2b3ffcdSSimon Schubert KASSERT(td != NULL && td->td_proc != NULL,
969b2b3ffcdSSimon Schubert ("bus_dmamap_load_uio: USERSPACE but no proc"));
970b2b3ffcdSSimon Schubert pmap = vmspace_pmap(td->td_proc->p_vmspace);
971b2b3ffcdSSimon Schubert } else {
972b2b3ffcdSSimon Schubert pmap = NULL;
973b2b3ffcdSSimon Schubert }
974b2b3ffcdSSimon Schubert
975b2b3ffcdSSimon Schubert error = 0;
976b2b3ffcdSSimon Schubert nsegs = 1;
977b2b3ffcdSSimon Schubert first = 1;
978b2b3ffcdSSimon Schubert lastaddr = 0;
979b2b3ffcdSSimon Schubert for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
980b2b3ffcdSSimon Schubert /*
981b2b3ffcdSSimon Schubert * Now at the first iovec to load. Load each iovec
982b2b3ffcdSSimon Schubert * until we have exhausted the residual count.
983b2b3ffcdSSimon Schubert */
984b2b3ffcdSSimon Schubert bus_size_t minlen =
985b2b3ffcdSSimon Schubert resid < iov[i].iov_len ? resid : iov[i].iov_len;
986b2b3ffcdSSimon Schubert caddr_t addr = (caddr_t) iov[i].iov_base;
987b2b3ffcdSSimon Schubert
988b2b3ffcdSSimon Schubert error = _bus_dmamap_load_buffer(dmat, map, addr, minlen,
989b2b3ffcdSSimon Schubert segs, nsegs_left,
990b2b3ffcdSSimon Schubert pmap, flags, &lastaddr, &nsegs, first);
991b2b3ffcdSSimon Schubert first = 0;
992b2b3ffcdSSimon Schubert
993b2b3ffcdSSimon Schubert resid -= minlen;
994b2b3ffcdSSimon Schubert if (error == 0) {
995b2b3ffcdSSimon Schubert nsegs_left -= nsegs;
996b2b3ffcdSSimon Schubert segs += nsegs;
997b2b3ffcdSSimon Schubert }
998b2b3ffcdSSimon Schubert }
999b2b3ffcdSSimon Schubert
1000b2b3ffcdSSimon Schubert /*
1001b2b3ffcdSSimon Schubert * Minimum one DMA segment, even if 0-length buffer.
1002b2b3ffcdSSimon Schubert */
1003b2b3ffcdSSimon Schubert if (nsegs_left == dmat->nsegments)
1004b2b3ffcdSSimon Schubert --nsegs_left;
1005b2b3ffcdSSimon Schubert
1006b2b3ffcdSSimon Schubert if (error) {
1007b2b3ffcdSSimon Schubert /* force "no valid mappings" in callback */
1008b2b3ffcdSSimon Schubert callback(callback_arg, segments, 0,
1009b2b3ffcdSSimon Schubert 0, error);
1010b2b3ffcdSSimon Schubert } else {
1011b2b3ffcdSSimon Schubert callback(callback_arg, segments, dmat->nsegments - nsegs_left,
1012b2b3ffcdSSimon Schubert (bus_size_t)uio->uio_resid, error);
1013b2b3ffcdSSimon Schubert }
1014b2b3ffcdSSimon Schubert if (dmat->nsegments > BUS_DMA_CACHE_SEGMENTS)
1015b2b3ffcdSSimon Schubert kfree(segments, M_DEVBUF);
1016b2b3ffcdSSimon Schubert return error;
1017b2b3ffcdSSimon Schubert }
1018b2b3ffcdSSimon Schubert
1019b2b3ffcdSSimon Schubert /*
1020b2b3ffcdSSimon Schubert * Release the mapping held by map.
1021b2b3ffcdSSimon Schubert */
1022b2b3ffcdSSimon Schubert void
_bus_dmamap_unload(bus_dma_tag_t dmat,bus_dmamap_t map)1023b2b3ffcdSSimon Schubert _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
1024b2b3ffcdSSimon Schubert {
1025b2b3ffcdSSimon Schubert struct bounce_page *bpage;
1026b2b3ffcdSSimon Schubert
1027b2b3ffcdSSimon Schubert while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
1028b2b3ffcdSSimon Schubert STAILQ_REMOVE_HEAD(&map->bpages, links);
1029b2b3ffcdSSimon Schubert free_bounce_page(dmat, bpage);
1030b2b3ffcdSSimon Schubert }
1031b2b3ffcdSSimon Schubert }
1032b2b3ffcdSSimon Schubert
1033b2b3ffcdSSimon Schubert void
_bus_dmamap_sync(bus_dma_tag_t dmat,bus_dmamap_t map,bus_dmasync_op_t op)1034b2b3ffcdSSimon Schubert _bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
1035b2b3ffcdSSimon Schubert {
1036b2b3ffcdSSimon Schubert struct bounce_page *bpage;
1037b2b3ffcdSSimon Schubert
1038b2b3ffcdSSimon Schubert if ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
1039b2b3ffcdSSimon Schubert /*
1040b2b3ffcdSSimon Schubert * Handle data bouncing. We might also
1041b2b3ffcdSSimon Schubert * want to add support for invalidating
1042b2b3ffcdSSimon Schubert * the caches on broken hardware
1043b2b3ffcdSSimon Schubert */
104433025e31SMatthew Dillon if (op & BUS_DMASYNC_PREWRITE) {
1045b2b3ffcdSSimon Schubert while (bpage != NULL) {
1046b2b3ffcdSSimon Schubert bcopy((void *)bpage->datavaddr,
1047b2b3ffcdSSimon Schubert (void *)bpage->vaddr,
1048b2b3ffcdSSimon Schubert bpage->datacount);
1049b2b3ffcdSSimon Schubert bpage = STAILQ_NEXT(bpage, links);
1050b2b3ffcdSSimon Schubert }
105133025e31SMatthew Dillon cpu_sfence();
1052b2b3ffcdSSimon Schubert dmat->bounce_zone->total_bounced++;
105333025e31SMatthew Dillon }
105433025e31SMatthew Dillon if (op & BUS_DMASYNC_POSTREAD) {
105533025e31SMatthew Dillon cpu_lfence();
1056b2b3ffcdSSimon Schubert while (bpage != NULL) {
1057b2b3ffcdSSimon Schubert bcopy((void *)bpage->vaddr,
1058b2b3ffcdSSimon Schubert (void *)bpage->datavaddr,
1059b2b3ffcdSSimon Schubert bpage->datacount);
1060b2b3ffcdSSimon Schubert bpage = STAILQ_NEXT(bpage, links);
1061b2b3ffcdSSimon Schubert }
1062b2b3ffcdSSimon Schubert dmat->bounce_zone->total_bounced++;
1063b2b3ffcdSSimon Schubert }
106433025e31SMatthew Dillon /* BUS_DMASYNC_PREREAD - no operation on intel */
106533025e31SMatthew Dillon /* BUS_DMASYNC_POSTWRITE - no operation on intel */
1066b2b3ffcdSSimon Schubert }
1067b2b3ffcdSSimon Schubert }
1068b2b3ffcdSSimon Schubert
1069b2b3ffcdSSimon Schubert static int
alloc_bounce_zone(bus_dma_tag_t dmat)1070b2b3ffcdSSimon Schubert alloc_bounce_zone(bus_dma_tag_t dmat)
1071b2b3ffcdSSimon Schubert {
1072b2b3ffcdSSimon Schubert struct bounce_zone *bz, *new_bz;
1073b2b3ffcdSSimon Schubert
1074b2b3ffcdSSimon Schubert KASSERT(dmat->bounce_zone == NULL,
1075ed20d0e3SSascha Wildner ("bounce zone was already assigned"));
1076b2b3ffcdSSimon Schubert
1077b2b3ffcdSSimon Schubert new_bz = kmalloc(sizeof(*new_bz), M_DEVBUF, M_INTWAIT | M_ZERO);
1078b2b3ffcdSSimon Schubert
10793b998fa9SMatthew Dillon lwkt_gettoken(&bounce_zone_tok);
1080b2b3ffcdSSimon Schubert
10817dbe273fSSepherosa Ziehau if ((dmat->flags & BUS_DMA_PRIVBZONE) == 0) {
10827dbe273fSSepherosa Ziehau /*
10837dbe273fSSepherosa Ziehau * For shared bounce zone, check to see
10847dbe273fSSepherosa Ziehau * if we already have a suitable zone
10857dbe273fSSepherosa Ziehau */
1086b2b3ffcdSSimon Schubert STAILQ_FOREACH(bz, &bounce_zone_list, links) {
1087b2b3ffcdSSimon Schubert if (dmat->alignment <= bz->alignment &&
1088b2b3ffcdSSimon Schubert dmat->lowaddr >= bz->lowaddr) {
10893b998fa9SMatthew Dillon lwkt_reltoken(&bounce_zone_tok);
1090b2b3ffcdSSimon Schubert
1091b2b3ffcdSSimon Schubert dmat->bounce_zone = bz;
1092b2b3ffcdSSimon Schubert kfree(new_bz, M_DEVBUF);
1093b2b3ffcdSSimon Schubert return 0;
1094b2b3ffcdSSimon Schubert }
1095b2b3ffcdSSimon Schubert }
10967dbe273fSSepherosa Ziehau }
1097b2b3ffcdSSimon Schubert bz = new_bz;
1098b2b3ffcdSSimon Schubert
1099ba87a4abSSascha Wildner spin_init(&bz->spin, "allocbouncezone");
1100b2b3ffcdSSimon Schubert STAILQ_INIT(&bz->bounce_page_list);
1101b2b3ffcdSSimon Schubert STAILQ_INIT(&bz->bounce_map_waitinglist);
1102b2b3ffcdSSimon Schubert bz->free_bpages = 0;
1103b2b3ffcdSSimon Schubert bz->reserved_bpages = 0;
1104b2b3ffcdSSimon Schubert bz->active_bpages = 0;
1105b2b3ffcdSSimon Schubert bz->lowaddr = dmat->lowaddr;
1106b2b3ffcdSSimon Schubert bz->alignment = round_page(dmat->alignment);
11077dbe273fSSepherosa Ziehau ksnprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr);
11087dbe273fSSepherosa Ziehau
11097dbe273fSSepherosa Ziehau if ((dmat->flags & BUS_DMA_PRIVBZONE) == 0) {
1110b2b3ffcdSSimon Schubert ksnprintf(bz->zoneid, 8, "zone%d", busdma_zonecount);
1111b2b3ffcdSSimon Schubert busdma_zonecount++;
1112b2b3ffcdSSimon Schubert STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links);
11137dbe273fSSepherosa Ziehau } else {
11147dbe273fSSepherosa Ziehau ksnprintf(bz->zoneid, 8, "zone%d", busdma_priv_zonecount);
11157dbe273fSSepherosa Ziehau busdma_priv_zonecount--;
11167dbe273fSSepherosa Ziehau }
1117b2b3ffcdSSimon Schubert
11183b998fa9SMatthew Dillon lwkt_reltoken(&bounce_zone_tok);
1119b2b3ffcdSSimon Schubert
1120b2b3ffcdSSimon Schubert dmat->bounce_zone = bz;
1121b2b3ffcdSSimon Schubert
1122b2b3ffcdSSimon Schubert sysctl_ctx_init(&bz->sysctl_ctx);
1123b2b3ffcdSSimon Schubert bz->sysctl_tree = SYSCTL_ADD_NODE(&bz->sysctl_ctx,
1124b2b3ffcdSSimon Schubert SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid,
1125b2b3ffcdSSimon Schubert CTLFLAG_RD, 0, "");
1126b2b3ffcdSSimon Schubert if (bz->sysctl_tree == NULL) {
1127b2b3ffcdSSimon Schubert sysctl_ctx_free(&bz->sysctl_ctx);
1128b2b3ffcdSSimon Schubert return 0; /* XXX error code? */
1129b2b3ffcdSSimon Schubert }
1130b2b3ffcdSSimon Schubert
1131b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1132b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1133b2b3ffcdSSimon Schubert "total_bpages", CTLFLAG_RD, &bz->total_bpages, 0,
1134b2b3ffcdSSimon Schubert "Total bounce pages");
1135b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1136b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1137b2b3ffcdSSimon Schubert "free_bpages", CTLFLAG_RD, &bz->free_bpages, 0,
1138b2b3ffcdSSimon Schubert "Free bounce pages");
1139b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1140b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1141b2b3ffcdSSimon Schubert "reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0,
1142b2b3ffcdSSimon Schubert "Reserved bounce pages");
1143b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1144b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1145b2b3ffcdSSimon Schubert "active_bpages", CTLFLAG_RD, &bz->active_bpages, 0,
1146b2b3ffcdSSimon Schubert "Active bounce pages");
1147b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1148b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1149b2b3ffcdSSimon Schubert "total_bounced", CTLFLAG_RD, &bz->total_bounced, 0,
1150b2b3ffcdSSimon Schubert "Total bounce requests");
1151b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1152b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1153b2b3ffcdSSimon Schubert "total_deferred", CTLFLAG_RD, &bz->total_deferred, 0,
1154b2b3ffcdSSimon Schubert "Total bounce requests that were deferred");
1155b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1156b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1157b2b3ffcdSSimon Schubert "reserve_failed", CTLFLAG_RD, &bz->reserve_failed, 0,
1158b2b3ffcdSSimon Schubert "Total bounce page reservations that were failed");
1159b2b3ffcdSSimon Schubert SYSCTL_ADD_STRING(&bz->sysctl_ctx,
1160b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1161b2b3ffcdSSimon Schubert "lowaddr", CTLFLAG_RD, bz->lowaddrid, 0, "");
1162b2b3ffcdSSimon Schubert SYSCTL_ADD_INT(&bz->sysctl_ctx,
1163b2b3ffcdSSimon Schubert SYSCTL_CHILDREN(bz->sysctl_tree), OID_AUTO,
1164b2b3ffcdSSimon Schubert "alignment", CTLFLAG_RD, &bz->alignment, 0, "");
1165b2b3ffcdSSimon Schubert
1166b2b3ffcdSSimon Schubert return 0;
1167b2b3ffcdSSimon Schubert }
1168b2b3ffcdSSimon Schubert
1169b2b3ffcdSSimon Schubert static int
alloc_bounce_pages(bus_dma_tag_t dmat,u_int numpages,int flags)1170b2b3ffcdSSimon Schubert alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages, int flags)
1171b2b3ffcdSSimon Schubert {
1172b2b3ffcdSSimon Schubert struct bounce_zone *bz = dmat->bounce_zone;
1173b2b3ffcdSSimon Schubert int count = 0, mflags;
1174b2b3ffcdSSimon Schubert
1175b2b3ffcdSSimon Schubert if (flags & BUS_DMA_NOWAIT)
1176b2b3ffcdSSimon Schubert mflags = M_NOWAIT;
1177b2b3ffcdSSimon Schubert else
1178b2b3ffcdSSimon Schubert mflags = M_WAITOK;
1179b2b3ffcdSSimon Schubert
1180b2b3ffcdSSimon Schubert while (numpages > 0) {
1181b2b3ffcdSSimon Schubert struct bounce_page *bpage;
1182b2b3ffcdSSimon Schubert
1183b2b3ffcdSSimon Schubert bpage = kmalloc(sizeof(*bpage), M_DEVBUF, M_INTWAIT | M_ZERO);
1184b2b3ffcdSSimon Schubert
1185b2b3ffcdSSimon Schubert bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF,
1186b2b3ffcdSSimon Schubert mflags, 0ul,
1187b2b3ffcdSSimon Schubert bz->lowaddr,
1188b2b3ffcdSSimon Schubert bz->alignment, 0);
1189b2b3ffcdSSimon Schubert if (bpage->vaddr == 0) {
1190b2b3ffcdSSimon Schubert kfree(bpage, M_DEVBUF);
1191b2b3ffcdSSimon Schubert break;
1192b2b3ffcdSSimon Schubert }
1193b2b3ffcdSSimon Schubert bpage->busaddr = pmap_kextract(bpage->vaddr);
1194b2b3ffcdSSimon Schubert
1195b2b3ffcdSSimon Schubert BZ_LOCK(bz);
1196b2b3ffcdSSimon Schubert STAILQ_INSERT_TAIL(&bz->bounce_page_list, bpage, links);
1197b2b3ffcdSSimon Schubert total_bounce_pages++;
1198b2b3ffcdSSimon Schubert bz->total_bpages++;
1199b2b3ffcdSSimon Schubert bz->free_bpages++;
1200b2b3ffcdSSimon Schubert BZ_UNLOCK(bz);
1201b2b3ffcdSSimon Schubert
1202b2b3ffcdSSimon Schubert count++;
1203b2b3ffcdSSimon Schubert numpages--;
1204b2b3ffcdSSimon Schubert }
1205b2b3ffcdSSimon Schubert return count;
1206b2b3ffcdSSimon Schubert }
1207b2b3ffcdSSimon Schubert
12087dbe273fSSepherosa Ziehau static void
free_bounce_pages_all(bus_dma_tag_t dmat)12097dbe273fSSepherosa Ziehau free_bounce_pages_all(bus_dma_tag_t dmat)
12107dbe273fSSepherosa Ziehau {
12117dbe273fSSepherosa Ziehau struct bounce_zone *bz = dmat->bounce_zone;
12127dbe273fSSepherosa Ziehau struct bounce_page *bpage;
12137dbe273fSSepherosa Ziehau
12147dbe273fSSepherosa Ziehau BZ_LOCK(bz);
12157dbe273fSSepherosa Ziehau
12167dbe273fSSepherosa Ziehau while ((bpage = STAILQ_FIRST(&bz->bounce_page_list)) != NULL) {
12177dbe273fSSepherosa Ziehau STAILQ_REMOVE_HEAD(&bz->bounce_page_list, links);
12187dbe273fSSepherosa Ziehau
12197dbe273fSSepherosa Ziehau KKASSERT(total_bounce_pages > 0);
12207dbe273fSSepherosa Ziehau total_bounce_pages--;
12217dbe273fSSepherosa Ziehau
12227dbe273fSSepherosa Ziehau KKASSERT(bz->total_bpages > 0);
12237dbe273fSSepherosa Ziehau bz->total_bpages--;
12247dbe273fSSepherosa Ziehau
12257dbe273fSSepherosa Ziehau KKASSERT(bz->free_bpages > 0);
12267dbe273fSSepherosa Ziehau bz->free_bpages--;
12277dbe273fSSepherosa Ziehau
12283b264617SMatthew Dillon BZ_UNLOCK(bz);
12297dbe273fSSepherosa Ziehau contigfree((void *)bpage->vaddr, PAGE_SIZE, M_DEVBUF);
12307dbe273fSSepherosa Ziehau kfree(bpage, M_DEVBUF);
12313b264617SMatthew Dillon BZ_LOCK(bz);
12327dbe273fSSepherosa Ziehau }
12337dbe273fSSepherosa Ziehau if (bz->total_bpages) {
12347dbe273fSSepherosa Ziehau kprintf("#%d bounce pages are still in use\n",
12357dbe273fSSepherosa Ziehau bz->total_bpages);
12367dbe273fSSepherosa Ziehau print_backtrace(-1);
12377dbe273fSSepherosa Ziehau }
12387dbe273fSSepherosa Ziehau
12397dbe273fSSepherosa Ziehau BZ_UNLOCK(bz);
12407dbe273fSSepherosa Ziehau }
12417dbe273fSSepherosa Ziehau
12427dbe273fSSepherosa Ziehau static void
free_bounce_zone(bus_dma_tag_t dmat)12437dbe273fSSepherosa Ziehau free_bounce_zone(bus_dma_tag_t dmat)
12447dbe273fSSepherosa Ziehau {
12457dbe273fSSepherosa Ziehau struct bounce_zone *bz = dmat->bounce_zone;
12467dbe273fSSepherosa Ziehau
12477dbe273fSSepherosa Ziehau if (bz == NULL)
12487dbe273fSSepherosa Ziehau return;
12497dbe273fSSepherosa Ziehau
12507dbe273fSSepherosa Ziehau if ((dmat->flags & BUS_DMA_PRIVBZONE) == 0)
12517dbe273fSSepherosa Ziehau return;
12527dbe273fSSepherosa Ziehau
12537dbe273fSSepherosa Ziehau free_bounce_pages_all(dmat);
12547dbe273fSSepherosa Ziehau dmat->bounce_zone = NULL;
12557dbe273fSSepherosa Ziehau
125608abe714SSepherosa Ziehau if (bz->sysctl_tree != NULL)
12577dbe273fSSepherosa Ziehau sysctl_ctx_free(&bz->sysctl_ctx);
12587dbe273fSSepherosa Ziehau kfree(bz, M_DEVBUF);
12597dbe273fSSepherosa Ziehau }
12607dbe273fSSepherosa Ziehau
1261b2b3ffcdSSimon Schubert /* Assume caller holds bounce zone spinlock */
1262b2b3ffcdSSimon Schubert static int
reserve_bounce_pages(bus_dma_tag_t dmat,bus_dmamap_t map,int commit)1263b2b3ffcdSSimon Schubert reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, int commit)
1264b2b3ffcdSSimon Schubert {
1265b2b3ffcdSSimon Schubert struct bounce_zone *bz = dmat->bounce_zone;
1266b2b3ffcdSSimon Schubert int pages;
1267b2b3ffcdSSimon Schubert
1268b2b3ffcdSSimon Schubert pages = MIN(bz->free_bpages, map->pagesneeded - map->pagesreserved);
1269b2b3ffcdSSimon Schubert if (!commit && map->pagesneeded > (map->pagesreserved + pages)) {
1270b2b3ffcdSSimon Schubert bz->reserve_failed++;
1271b2b3ffcdSSimon Schubert return (map->pagesneeded - (map->pagesreserved + pages));
1272b2b3ffcdSSimon Schubert }
1273b2b3ffcdSSimon Schubert
1274b2b3ffcdSSimon Schubert bz->free_bpages -= pages;
1275b2b3ffcdSSimon Schubert
1276b2b3ffcdSSimon Schubert bz->reserved_bpages += pages;
1277b2b3ffcdSSimon Schubert KKASSERT(bz->reserved_bpages <= bz->total_bpages);
1278b2b3ffcdSSimon Schubert
1279b2b3ffcdSSimon Schubert map->pagesreserved += pages;
1280b2b3ffcdSSimon Schubert pages = map->pagesneeded - map->pagesreserved;
1281b2b3ffcdSSimon Schubert
1282b2b3ffcdSSimon Schubert return pages;
1283b2b3ffcdSSimon Schubert }
1284b2b3ffcdSSimon Schubert
1285b2b3ffcdSSimon Schubert static void
return_bounce_pages(bus_dma_tag_t dmat,bus_dmamap_t map)1286b2b3ffcdSSimon Schubert return_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map)
1287b2b3ffcdSSimon Schubert {
1288b2b3ffcdSSimon Schubert struct bounce_zone *bz = dmat->bounce_zone;
1289b2b3ffcdSSimon Schubert int reserved = map->pagesreserved;
1290b2b3ffcdSSimon Schubert bus_dmamap_t wait_map;
1291b2b3ffcdSSimon Schubert
1292b2b3ffcdSSimon Schubert map->pagesreserved = 0;
1293b2b3ffcdSSimon Schubert map->pagesneeded = 0;
1294b2b3ffcdSSimon Schubert
1295b2b3ffcdSSimon Schubert if (reserved == 0)
1296b2b3ffcdSSimon Schubert return;
1297b2b3ffcdSSimon Schubert
1298b2b3ffcdSSimon Schubert BZ_LOCK(bz);
1299b2b3ffcdSSimon Schubert
1300b2b3ffcdSSimon Schubert bz->free_bpages += reserved;
1301b2b3ffcdSSimon Schubert KKASSERT(bz->free_bpages <= bz->total_bpages);
1302b2b3ffcdSSimon Schubert
1303b2b3ffcdSSimon Schubert KKASSERT(bz->reserved_bpages >= reserved);
1304b2b3ffcdSSimon Schubert bz->reserved_bpages -= reserved;
1305b2b3ffcdSSimon Schubert
1306b2b3ffcdSSimon Schubert wait_map = get_map_waiting(dmat);
1307b2b3ffcdSSimon Schubert
1308b2b3ffcdSSimon Schubert BZ_UNLOCK(bz);
1309b2b3ffcdSSimon Schubert
1310b2b3ffcdSSimon Schubert if (wait_map != NULL)
1311b2b3ffcdSSimon Schubert add_map_callback(map);
1312b2b3ffcdSSimon Schubert }
1313b2b3ffcdSSimon Schubert
1314b2b3ffcdSSimon Schubert static bus_addr_t
add_bounce_page(bus_dma_tag_t dmat,bus_dmamap_t map,vm_offset_t vaddr,bus_size_t * sizep)1315b2b3ffcdSSimon Schubert add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr,
131633025e31SMatthew Dillon bus_size_t *sizep)
1317b2b3ffcdSSimon Schubert {
1318b2b3ffcdSSimon Schubert struct bounce_zone *bz = dmat->bounce_zone;
1319b2b3ffcdSSimon Schubert struct bounce_page *bpage;
132033025e31SMatthew Dillon bus_size_t size;
1321b2b3ffcdSSimon Schubert
1322b2b3ffcdSSimon Schubert KASSERT(map->pagesneeded > 0, ("map doesn't need any pages"));
1323b2b3ffcdSSimon Schubert map->pagesneeded--;
1324b2b3ffcdSSimon Schubert
1325b2b3ffcdSSimon Schubert KASSERT(map->pagesreserved > 0, ("map doesn't reserve any pages"));
1326b2b3ffcdSSimon Schubert map->pagesreserved--;
1327b2b3ffcdSSimon Schubert
1328b2b3ffcdSSimon Schubert BZ_LOCK(bz);
1329b2b3ffcdSSimon Schubert
1330b2b3ffcdSSimon Schubert bpage = STAILQ_FIRST(&bz->bounce_page_list);
1331b2b3ffcdSSimon Schubert KASSERT(bpage != NULL, ("free page list is empty"));
1332b2b3ffcdSSimon Schubert STAILQ_REMOVE_HEAD(&bz->bounce_page_list, links);
1333b2b3ffcdSSimon Schubert
1334b2b3ffcdSSimon Schubert KKASSERT(bz->reserved_bpages > 0);
1335b2b3ffcdSSimon Schubert bz->reserved_bpages--;
1336b2b3ffcdSSimon Schubert
1337b2b3ffcdSSimon Schubert bz->active_bpages++;
1338b2b3ffcdSSimon Schubert KKASSERT(bz->active_bpages <= bz->total_bpages);
1339b2b3ffcdSSimon Schubert
1340b2b3ffcdSSimon Schubert BZ_UNLOCK(bz);
1341b2b3ffcdSSimon Schubert
134266fe5a06SMarkus Pfeiffer if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
134333025e31SMatthew Dillon /*
134433025e31SMatthew Dillon * Page offset needs to be preserved. No size adjustments
134533025e31SMatthew Dillon * needed.
134633025e31SMatthew Dillon */
134766fe5a06SMarkus Pfeiffer bpage->vaddr |= vaddr & PAGE_MASK;
134866fe5a06SMarkus Pfeiffer bpage->busaddr |= vaddr & PAGE_MASK;
134933025e31SMatthew Dillon size = *sizep;
135033025e31SMatthew Dillon } else {
135133025e31SMatthew Dillon /*
135233025e31SMatthew Dillon * Realign to bounce page base address, reduce size if
135333025e31SMatthew Dillon * necessary. Bounce pages are typically already
135433025e31SMatthew Dillon * page-aligned.
135533025e31SMatthew Dillon */
135633025e31SMatthew Dillon size = PAGE_SIZE - (bpage->busaddr & PAGE_MASK);
135733025e31SMatthew Dillon if (size < *sizep) {
135833025e31SMatthew Dillon *sizep = size;
135933025e31SMatthew Dillon } else {
136033025e31SMatthew Dillon size = *sizep;
136133025e31SMatthew Dillon }
136266fe5a06SMarkus Pfeiffer }
136366fe5a06SMarkus Pfeiffer
1364b2b3ffcdSSimon Schubert bpage->datavaddr = vaddr;
1365b2b3ffcdSSimon Schubert bpage->datacount = size;
1366b2b3ffcdSSimon Schubert STAILQ_INSERT_TAIL(&map->bpages, bpage, links);
1367b2b3ffcdSSimon Schubert return bpage->busaddr;
1368b2b3ffcdSSimon Schubert }
1369b2b3ffcdSSimon Schubert
1370b2b3ffcdSSimon Schubert static void
free_bounce_page(bus_dma_tag_t dmat,struct bounce_page * bpage)1371b2b3ffcdSSimon Schubert free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage)
1372b2b3ffcdSSimon Schubert {
1373b2b3ffcdSSimon Schubert struct bounce_zone *bz = dmat->bounce_zone;
1374b2b3ffcdSSimon Schubert bus_dmamap_t map;
1375b2b3ffcdSSimon Schubert
1376b2b3ffcdSSimon Schubert bpage->datavaddr = 0;
1377b2b3ffcdSSimon Schubert bpage->datacount = 0;
1378b2b3ffcdSSimon Schubert
137966fe5a06SMarkus Pfeiffer if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) {
138066fe5a06SMarkus Pfeiffer /*
138166fe5a06SMarkus Pfeiffer * Reset the bounce page to start at offset 0. Other uses
138266fe5a06SMarkus Pfeiffer * of this bounce page may need to store a full page of
138366fe5a06SMarkus Pfeiffer * data and/or assume it starts on a page boundary.
138466fe5a06SMarkus Pfeiffer */
138566fe5a06SMarkus Pfeiffer bpage->vaddr &= ~PAGE_MASK;
138666fe5a06SMarkus Pfeiffer bpage->busaddr &= ~PAGE_MASK;
138766fe5a06SMarkus Pfeiffer }
138866fe5a06SMarkus Pfeiffer
1389b2b3ffcdSSimon Schubert BZ_LOCK(bz);
1390b2b3ffcdSSimon Schubert
1391b2b3ffcdSSimon Schubert STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links);
1392b2b3ffcdSSimon Schubert
1393b2b3ffcdSSimon Schubert bz->free_bpages++;
1394b2b3ffcdSSimon Schubert KKASSERT(bz->free_bpages <= bz->total_bpages);
1395b2b3ffcdSSimon Schubert
1396b2b3ffcdSSimon Schubert KKASSERT(bz->active_bpages > 0);
1397b2b3ffcdSSimon Schubert bz->active_bpages--;
1398b2b3ffcdSSimon Schubert
1399b2b3ffcdSSimon Schubert map = get_map_waiting(dmat);
1400b2b3ffcdSSimon Schubert
1401b2b3ffcdSSimon Schubert BZ_UNLOCK(bz);
1402b2b3ffcdSSimon Schubert
14033124cc72SMatthew Dillon if (map != NULL && map != (void *)-1)
1404b2b3ffcdSSimon Schubert add_map_callback(map);
1405b2b3ffcdSSimon Schubert }
1406b2b3ffcdSSimon Schubert
1407b2b3ffcdSSimon Schubert /* Assume caller holds bounce zone spinlock */
1408b2b3ffcdSSimon Schubert static bus_dmamap_t
get_map_waiting(bus_dma_tag_t dmat)1409b2b3ffcdSSimon Schubert get_map_waiting(bus_dma_tag_t dmat)
1410b2b3ffcdSSimon Schubert {
1411b2b3ffcdSSimon Schubert struct bounce_zone *bz = dmat->bounce_zone;
1412b2b3ffcdSSimon Schubert bus_dmamap_t map;
1413b2b3ffcdSSimon Schubert
1414b2b3ffcdSSimon Schubert map = STAILQ_FIRST(&bz->bounce_map_waitinglist);
14153124cc72SMatthew Dillon if (map != NULL && map != (void *)-1) {
1416b2b3ffcdSSimon Schubert if (reserve_bounce_pages(map->dmat, map, 1) == 0) {
1417b2b3ffcdSSimon Schubert STAILQ_REMOVE_HEAD(&bz->bounce_map_waitinglist, links);
1418b2b3ffcdSSimon Schubert bz->total_deferred++;
1419b2b3ffcdSSimon Schubert } else {
1420b2b3ffcdSSimon Schubert map = NULL;
1421b2b3ffcdSSimon Schubert }
1422b2b3ffcdSSimon Schubert }
1423b2b3ffcdSSimon Schubert return map;
1424b2b3ffcdSSimon Schubert }
1425b2b3ffcdSSimon Schubert
1426b2b3ffcdSSimon Schubert static void
add_map_callback(bus_dmamap_t map)1427b2b3ffcdSSimon Schubert add_map_callback(bus_dmamap_t map)
1428b2b3ffcdSSimon Schubert {
14290d4f82f8SMatthew Dillon spin_lock(&bounce_map_list_spin);
1430b2b3ffcdSSimon Schubert STAILQ_INSERT_TAIL(&bounce_map_callbacklist, map, links);
1431b2b3ffcdSSimon Schubert busdma_swi_pending = 1;
1432b2b3ffcdSSimon Schubert setsoftvm();
14330d4f82f8SMatthew Dillon spin_unlock(&bounce_map_list_spin);
1434b2b3ffcdSSimon Schubert }
1435b2b3ffcdSSimon Schubert
1436b2b3ffcdSSimon Schubert void
busdma_swi(void)1437b2b3ffcdSSimon Schubert busdma_swi(void)
1438b2b3ffcdSSimon Schubert {
1439b2b3ffcdSSimon Schubert bus_dmamap_t map;
1440b2b3ffcdSSimon Schubert
14410d4f82f8SMatthew Dillon spin_lock(&bounce_map_list_spin);
1442b2b3ffcdSSimon Schubert while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) {
1443b2b3ffcdSSimon Schubert STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links);
14440d4f82f8SMatthew Dillon spin_unlock(&bounce_map_list_spin);
1445b2b3ffcdSSimon Schubert bus_dmamap_load(map->dmat, map, map->buf, map->buflen,
1446b2b3ffcdSSimon Schubert map->callback, map->callback_arg, /*flags*/0);
14470d4f82f8SMatthew Dillon spin_lock(&bounce_map_list_spin);
1448b2b3ffcdSSimon Schubert }
14490d4f82f8SMatthew Dillon spin_unlock(&bounce_map_list_spin);
1450b2b3ffcdSSimon Schubert }
1451fbd57254SSepherosa Ziehau
1452fbd57254SSepherosa Ziehau int
bus_space_map(bus_space_tag_t t __unused,bus_addr_t addr,bus_size_t size,int flags __unused,bus_space_handle_t * bshp)1453fbd57254SSepherosa Ziehau bus_space_map(bus_space_tag_t t __unused, bus_addr_t addr, bus_size_t size,
1454fbd57254SSepherosa Ziehau int flags __unused, bus_space_handle_t *bshp)
1455fbd57254SSepherosa Ziehau {
1456fbd57254SSepherosa Ziehau
1457fbd57254SSepherosa Ziehau if (t == X86_64_BUS_SPACE_MEM)
1458fbd57254SSepherosa Ziehau *bshp = (uintptr_t)pmap_mapdev(addr, size);
1459fbd57254SSepherosa Ziehau else
1460fbd57254SSepherosa Ziehau *bshp = addr;
1461fbd57254SSepherosa Ziehau return (0);
1462fbd57254SSepherosa Ziehau }
1463fbd57254SSepherosa Ziehau
1464fbd57254SSepherosa Ziehau void
bus_space_unmap(bus_space_tag_t t,bus_space_handle_t bsh,bus_size_t size)1465fbd57254SSepherosa Ziehau bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
1466fbd57254SSepherosa Ziehau {
1467fbd57254SSepherosa Ziehau if (t == X86_64_BUS_SPACE_MEM)
1468fbd57254SSepherosa Ziehau pmap_unmapdev(bsh, size);
1469fbd57254SSepherosa Ziehau }
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