busdma_machdep-v4.c revision 232356
1139735Simp/*- 2129198Scognet * Copyright (c) 2004 Olivier Houchard 3129198Scognet * Copyright (c) 2002 Peter Grehan 4129198Scognet * Copyright (c) 1997, 1998 Justin T. Gibbs. 5129198Scognet * All rights reserved. 6129198Scognet * 7129198Scognet * Redistribution and use in source and binary forms, with or without 8129198Scognet * modification, are permitted provided that the following conditions 9129198Scognet * are met: 10129198Scognet * 1. Redistributions of source code must retain the above copyright 11129198Scognet * notice, this list of conditions, and the following disclaimer, 12129198Scognet * without modification, immediately at the beginning of the file. 13129198Scognet * 2. The name of the author may not be used to endorse or promote products 14129198Scognet * derived from this software without specific prior written permission. 15129198Scognet * 16129198Scognet * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17129198Scognet * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18129198Scognet * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19129198Scognet * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20129198Scognet * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21129198Scognet * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22129198Scognet * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23129198Scognet * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24129198Scognet * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25129198Scognet * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26129198Scognet * SUCH DAMAGE. 27129198Scognet * 28129198Scognet * From i386/busdma_machdep.c,v 1.26 2002/04/19 22:58:09 alfred 29129198Scognet */ 30129198Scognet 31129198Scognet#include <sys/cdefs.h> 32129198Scognet__FBSDID("$FreeBSD: head/sys/arm/arm/busdma_machdep.c 232356 2012-03-01 19:58:34Z jhb $"); 33129198Scognet 34129198Scognet/* 35166686Skevlo * ARM bus dma support routines 36129198Scognet */ 37129198Scognet 38129198Scognet#define _ARM32_BUS_DMA_PRIVATE 39129198Scognet#include <sys/param.h> 40129198Scognet#include <sys/systm.h> 41129198Scognet#include <sys/malloc.h> 42129198Scognet#include <sys/bus.h> 43129198Scognet#include <sys/interrupt.h> 44129198Scognet#include <sys/lock.h> 45129198Scognet#include <sys/proc.h> 46129198Scognet#include <sys/mutex.h> 47129198Scognet#include <sys/mbuf.h> 48129198Scognet#include <sys/uio.h> 49140310Scognet#include <sys/ktr.h> 50146597Scognet#include <sys/kernel.h> 51166063Scognet#include <sys/sysctl.h> 52129198Scognet 53129198Scognet#include <vm/vm.h> 54129198Scognet#include <vm/vm_page.h> 55129198Scognet#include <vm/vm_map.h> 56129198Scognet 57129198Scognet#include <machine/atomic.h> 58129198Scognet#include <machine/bus.h> 59129198Scognet#include <machine/cpufunc.h> 60166063Scognet#include <machine/md_var.h> 61129198Scognet 62166063Scognet#define MAX_BPAGES 64 63166063Scognet#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3 64166063Scognet#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4 65166063Scognet 66166063Scognetstruct bounce_zone; 67166063Scognet 68129198Scognetstruct bus_dma_tag { 69129198Scognet bus_dma_tag_t parent; 70129198Scognet bus_size_t alignment; 71232356Sjhb bus_addr_t boundary; 72129198Scognet bus_addr_t lowaddr; 73129198Scognet bus_addr_t highaddr; 74129198Scognet bus_dma_filter_t *filter; 75129198Scognet void *filterarg; 76129198Scognet bus_size_t maxsize; 77129198Scognet u_int nsegments; 78129198Scognet bus_size_t maxsegsz; 79129198Scognet int flags; 80129198Scognet int ref_count; 81129198Scognet int map_count; 82129198Scognet bus_dma_lock_t *lockfunc; 83129198Scognet void *lockfuncarg; 84129198Scognet /* 85129198Scognet * DMA range for this tag. If the page doesn't fall within 86129198Scognet * one of these ranges, an error is returned. The caller 87129198Scognet * may then decide what to do with the transfer. If the 88129198Scognet * range pointer is NULL, it is ignored. 89129198Scognet */ 90129198Scognet struct arm32_dma_range *ranges; 91129198Scognet int _nranges; 92166063Scognet struct bounce_zone *bounce_zone; 93129198Scognet}; 94129198Scognet 95166063Scognetstruct bounce_page { 96166063Scognet vm_offset_t vaddr; /* kva of bounce buffer */ 97166063Scognet vm_offset_t vaddr_nocache; /* kva of bounce buffer uncached */ 98166063Scognet bus_addr_t busaddr; /* Physical address */ 99166063Scognet vm_offset_t datavaddr; /* kva of client data */ 100166063Scognet bus_size_t datacount; /* client data count */ 101166063Scognet STAILQ_ENTRY(bounce_page) links; 102166063Scognet}; 103166063Scognet 104166063Scognetint busdma_swi_pending; 105166063Scognet 106166063Scognetstruct bounce_zone { 107166063Scognet STAILQ_ENTRY(bounce_zone) links; 108166063Scognet STAILQ_HEAD(bp_list, bounce_page) bounce_page_list; 109166063Scognet int total_bpages; 110166063Scognet int free_bpages; 111166063Scognet int reserved_bpages; 112166063Scognet int active_bpages; 113166063Scognet int total_bounced; 114166063Scognet int total_deferred; 115188403Scognet int map_count; 116166063Scognet bus_size_t alignment; 117166063Scognet bus_addr_t lowaddr; 118166063Scognet char zoneid[8]; 119166063Scognet char lowaddrid[20]; 120166063Scognet struct sysctl_ctx_list sysctl_tree; 121166063Scognet struct sysctl_oid *sysctl_tree_top; 122166063Scognet}; 123166063Scognet 124166063Scognetstatic struct mtx bounce_lock; 125166063Scognetstatic int total_bpages; 126166063Scognetstatic int busdma_zonecount; 127166063Scognetstatic STAILQ_HEAD(, bounce_zone) bounce_zone_list; 128166063Scognet 129227309Sedstatic SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0, "Busdma parameters"); 130166063ScognetSYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bpages, 0, 131166063Scognet "Total bounce pages"); 132166063Scognet 133135644Scognet#define DMAMAP_LINEAR 0x1 134135644Scognet#define DMAMAP_MBUF 0x2 135135644Scognet#define DMAMAP_UIO 0x4 136146597Scognet#define DMAMAP_ALLOCATED 0x10 137135644Scognet#define DMAMAP_TYPE_MASK (DMAMAP_LINEAR|DMAMAP_MBUF|DMAMAP_UIO) 138135644Scognet#define DMAMAP_COHERENT 0x8 139129198Scognetstruct bus_dmamap { 140166063Scognet struct bp_list bpages; 141166063Scognet int pagesneeded; 142166063Scognet int pagesreserved; 143135644Scognet bus_dma_tag_t dmat; 144135644Scognet int flags; 145135644Scognet void *buffer; 146156191Scognet void *origbuffer; 147156191Scognet void *allocbuffer; 148147591Scognet TAILQ_ENTRY(bus_dmamap) freelist; 149135644Scognet int len; 150166063Scognet STAILQ_ENTRY(bus_dmamap) links; 151166063Scognet bus_dmamap_callback_t *callback; 152166063Scognet void *callback_arg; 153166063Scognet 154129198Scognet}; 155129198Scognet 156166063Scognetstatic STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist; 157166063Scognetstatic STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist; 158166063Scognet 159147591Scognetstatic TAILQ_HEAD(,bus_dmamap) dmamap_freelist = 160147591Scognet TAILQ_HEAD_INITIALIZER(dmamap_freelist); 161147591Scognet 162146597Scognet#define BUSDMA_STATIC_MAPS 500 163146597Scognetstatic struct bus_dmamap map_pool[BUSDMA_STATIC_MAPS]; 164146597Scognet 165146597Scognetstatic struct mtx busdma_mtx; 166146597Scognet 167146597ScognetMTX_SYSINIT(busdma_mtx, &busdma_mtx, "busdma lock", MTX_DEF); 168146597Scognet 169166063Scognetstatic void init_bounce_pages(void *dummy); 170166063Scognetstatic int alloc_bounce_zone(bus_dma_tag_t dmat); 171166063Scognetstatic int alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages); 172166063Scognetstatic int reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, 173166063Scognet int commit); 174166063Scognetstatic bus_addr_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, 175166063Scognet vm_offset_t vaddr, bus_size_t size); 176166063Scognetstatic void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage); 177166063Scognet 178166063Scognet/* Default tag, as most drivers provide no parent tag. */ 179166063Scognetbus_dma_tag_t arm_root_dma_tag; 180166063Scognet 181166063Scognet/* 182166063Scognet * Return true if a match is made. 183166063Scognet * 184166063Scognet * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'. 185166063Scognet * 186166063Scognet * If paddr is within the bounds of the dma tag then call the filter callback 187166063Scognet * to check for a match, if there is no filter callback then assume a match. 188166063Scognet */ 189166063Scognetstatic int 190166063Scognetrun_filter(bus_dma_tag_t dmat, bus_addr_t paddr) 191166063Scognet{ 192166063Scognet int retval; 193166063Scognet 194166063Scognet retval = 0; 195166063Scognet 196166063Scognet do { 197166063Scognet if (((paddr > dmat->lowaddr && paddr <= dmat->highaddr) 198166063Scognet || ((paddr & (dmat->alignment - 1)) != 0)) 199166063Scognet && (dmat->filter == NULL 200166063Scognet || (*dmat->filter)(dmat->filterarg, paddr) != 0)) 201166063Scognet retval = 1; 202166063Scognet 203166063Scognet dmat = dmat->parent; 204166063Scognet } while (retval == 0 && dmat != NULL); 205166063Scognet return (retval); 206166063Scognet} 207166063Scognet 208147591Scognetstatic void 209147591Scognetarm_dmamap_freelist_init(void *dummy) 210147591Scognet{ 211147591Scognet int i; 212147591Scognet 213147591Scognet for (i = 0; i < BUSDMA_STATIC_MAPS; i++) 214147591Scognet TAILQ_INSERT_HEAD(&dmamap_freelist, &map_pool[i], freelist); 215147591Scognet} 216147591Scognet 217147591ScognetSYSINIT(busdma, SI_SUB_VM, SI_ORDER_ANY, arm_dmamap_freelist_init, NULL); 218147591Scognet 219129198Scognet/* 220129198Scognet * Check to see if the specified page is in an allowed DMA range. 221129198Scognet */ 222129198Scognet 223137758Scognetstatic __inline int 224140349Scognetbus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs, 225137758Scognet bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap, 226137760Scognet int flags, vm_offset_t *lastaddrp, int *segp); 227135644Scognet 228166063Scognetstatic __inline int 229166063Scognet_bus_dma_can_bounce(vm_offset_t lowaddr, vm_offset_t highaddr) 230166063Scognet{ 231166063Scognet int i; 232166063Scognet for (i = 0; phys_avail[i] && phys_avail[i + 1]; i += 2) { 233166063Scognet if ((lowaddr >= phys_avail[i] && lowaddr <= phys_avail[i + 1]) 234166063Scognet || (lowaddr < phys_avail[i] && 235166063Scognet highaddr > phys_avail[i])) 236166063Scognet return (1); 237166063Scognet } 238166063Scognet return (0); 239166063Scognet} 240166063Scognet 241129198Scognetstatic __inline struct arm32_dma_range * 242129198Scognet_bus_dma_inrange(struct arm32_dma_range *ranges, int nranges, 243129198Scognet bus_addr_t curaddr) 244129198Scognet{ 245129198Scognet struct arm32_dma_range *dr; 246129198Scognet int i; 247129198Scognet 248129198Scognet for (i = 0, dr = ranges; i < nranges; i++, dr++) { 249129198Scognet if (curaddr >= dr->dr_sysbase && 250129198Scognet round_page(curaddr) <= (dr->dr_sysbase + dr->dr_len)) 251129198Scognet return (dr); 252129198Scognet } 253129198Scognet 254129198Scognet return (NULL); 255129198Scognet} 256129198Scognet/* 257129198Scognet * Convenience function for manipulating driver locks from busdma (during 258129198Scognet * busdma_swi, for example). Drivers that don't provide their own locks 259129198Scognet * should specify &Giant to dmat->lockfuncarg. Drivers that use their own 260129198Scognet * non-mutex locking scheme don't have to use this at all. 261129198Scognet */ 262129198Scognetvoid 263129198Scognetbusdma_lock_mutex(void *arg, bus_dma_lock_op_t op) 264129198Scognet{ 265129198Scognet struct mtx *dmtx; 266129198Scognet 267129198Scognet dmtx = (struct mtx *)arg; 268129198Scognet switch (op) { 269129198Scognet case BUS_DMA_LOCK: 270129198Scognet mtx_lock(dmtx); 271129198Scognet break; 272129198Scognet case BUS_DMA_UNLOCK: 273129198Scognet mtx_unlock(dmtx); 274129198Scognet break; 275129198Scognet default: 276129198Scognet panic("Unknown operation 0x%x for busdma_lock_mutex!", op); 277129198Scognet } 278129198Scognet} 279129198Scognet 280129198Scognet/* 281129198Scognet * dflt_lock should never get called. It gets put into the dma tag when 282129198Scognet * lockfunc == NULL, which is only valid if the maps that are associated 283129198Scognet * with the tag are meant to never be defered. 284129198Scognet * XXX Should have a way to identify which driver is responsible here. 285129198Scognet */ 286129198Scognetstatic void 287129198Scognetdflt_lock(void *arg, bus_dma_lock_op_t op) 288129198Scognet{ 289129198Scognet#ifdef INVARIANTS 290129198Scognet panic("driver error: busdma dflt_lock called"); 291129198Scognet#else 292129198Scognet printf("DRIVER_ERROR: busdma dflt_lock called\n"); 293129198Scognet#endif 294129198Scognet} 295129198Scognet 296147591Scognetstatic __inline bus_dmamap_t 297146597Scognet_busdma_alloc_dmamap(void) 298146597Scognet{ 299146597Scognet bus_dmamap_t map; 300146597Scognet 301146597Scognet mtx_lock(&busdma_mtx); 302147591Scognet map = TAILQ_FIRST(&dmamap_freelist); 303150860Scognet if (map) 304150860Scognet TAILQ_REMOVE(&dmamap_freelist, map, freelist); 305146597Scognet mtx_unlock(&busdma_mtx); 306147591Scognet if (!map) { 307166063Scognet map = malloc(sizeof(*map), M_DEVBUF, M_NOWAIT | M_ZERO); 308147591Scognet if (map) 309147591Scognet map->flags = DMAMAP_ALLOCATED; 310147591Scognet } else 311147591Scognet map->flags = 0; 312166063Scognet STAILQ_INIT(&map->bpages); 313146597Scognet return (map); 314146597Scognet} 315146597Scognet 316147591Scognetstatic __inline void 317146597Scognet_busdma_free_dmamap(bus_dmamap_t map) 318146597Scognet{ 319146597Scognet if (map->flags & DMAMAP_ALLOCATED) 320146597Scognet free(map, M_DEVBUF); 321146597Scognet else { 322146597Scognet mtx_lock(&busdma_mtx); 323147591Scognet TAILQ_INSERT_HEAD(&dmamap_freelist, map, freelist); 324146597Scognet mtx_unlock(&busdma_mtx); 325146597Scognet } 326146597Scognet} 327146597Scognet 328129198Scognet/* 329129198Scognet * Allocate a device specific dma_tag. 330129198Scognet */ 331135644Scognet#define SEG_NB 1024 332135644Scognet 333129198Scognetint 334129198Scognetbus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 335232356Sjhb bus_addr_t boundary, bus_addr_t lowaddr, 336129198Scognet bus_addr_t highaddr, bus_dma_filter_t *filter, 337129198Scognet void *filterarg, bus_size_t maxsize, int nsegments, 338129198Scognet bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 339129198Scognet void *lockfuncarg, bus_dma_tag_t *dmat) 340129198Scognet{ 341129198Scognet bus_dma_tag_t newtag; 342129198Scognet int error = 0; 343129198Scognet /* Return a NULL tag on failure */ 344129198Scognet *dmat = NULL; 345166063Scognet if (!parent) 346166063Scognet parent = arm_root_dma_tag; 347129198Scognet 348129198Scognet newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, M_NOWAIT); 349140313Scognet if (newtag == NULL) { 350143294Smux CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", 351143284Smux __func__, newtag, 0, error); 352129198Scognet return (ENOMEM); 353140313Scognet } 354129198Scognet 355129198Scognet newtag->parent = parent; 356129198Scognet newtag->alignment = alignment; 357129198Scognet newtag->boundary = boundary; 358129198Scognet newtag->lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1); 359129198Scognet newtag->highaddr = trunc_page((vm_offset_t)highaddr) + (PAGE_SIZE - 1); 360129198Scognet newtag->filter = filter; 361129198Scognet newtag->filterarg = filterarg; 362129198Scognet newtag->maxsize = maxsize; 363129198Scognet newtag->nsegments = nsegments; 364129198Scognet newtag->maxsegsz = maxsegsz; 365129198Scognet newtag->flags = flags; 366129198Scognet newtag->ref_count = 1; /* Count ourself */ 367129198Scognet newtag->map_count = 0; 368129198Scognet newtag->ranges = bus_dma_get_range(); 369135644Scognet newtag->_nranges = bus_dma_get_range_nb(); 370129198Scognet if (lockfunc != NULL) { 371129198Scognet newtag->lockfunc = lockfunc; 372129198Scognet newtag->lockfuncarg = lockfuncarg; 373129198Scognet } else { 374129198Scognet newtag->lockfunc = dflt_lock; 375129198Scognet newtag->lockfuncarg = NULL; 376129198Scognet } 377129198Scognet /* 378129198Scognet * Take into account any restrictions imposed by our parent tag 379129198Scognet */ 380129198Scognet if (parent != NULL) { 381232356Sjhb newtag->lowaddr = MIN(parent->lowaddr, newtag->lowaddr); 382232356Sjhb newtag->highaddr = MAX(parent->highaddr, newtag->highaddr); 383134934Sscottl if (newtag->boundary == 0) 384134934Sscottl newtag->boundary = parent->boundary; 385134934Sscottl else if (parent->boundary != 0) 386232356Sjhb newtag->boundary = MIN(parent->boundary, 387134934Sscottl newtag->boundary); 388166063Scognet if ((newtag->filter != NULL) || 389166063Scognet ((parent->flags & BUS_DMA_COULD_BOUNCE) != 0)) 390166063Scognet newtag->flags |= BUS_DMA_COULD_BOUNCE; 391129198Scognet if (newtag->filter == NULL) { 392129198Scognet /* 393129198Scognet * Short circuit looking at our parent directly 394129198Scognet * since we have encapsulated all of its information 395129198Scognet */ 396129198Scognet newtag->filter = parent->filter; 397129198Scognet newtag->filterarg = parent->filterarg; 398129198Scognet newtag->parent = parent->parent; 399129198Scognet } 400129198Scognet if (newtag->parent != NULL) 401129198Scognet atomic_add_int(&parent->ref_count, 1); 402129198Scognet } 403166063Scognet if (_bus_dma_can_bounce(newtag->lowaddr, newtag->highaddr) 404166063Scognet || newtag->alignment > 1) 405166063Scognet newtag->flags |= BUS_DMA_COULD_BOUNCE; 406129198Scognet 407166063Scognet if (((newtag->flags & BUS_DMA_COULD_BOUNCE) != 0) && 408166063Scognet (flags & BUS_DMA_ALLOCNOW) != 0) { 409166063Scognet struct bounce_zone *bz; 410166063Scognet 411166063Scognet /* Must bounce */ 412166063Scognet 413166063Scognet if ((error = alloc_bounce_zone(newtag)) != 0) { 414166063Scognet free(newtag, M_DEVBUF); 415166063Scognet return (error); 416166063Scognet } 417166063Scognet bz = newtag->bounce_zone; 418166063Scognet 419166063Scognet if (ptoa(bz->total_bpages) < maxsize) { 420166063Scognet int pages; 421166063Scognet 422166063Scognet pages = atop(maxsize) - bz->total_bpages; 423166063Scognet 424166063Scognet /* Add pages to our bounce pool */ 425166063Scognet if (alloc_bounce_pages(newtag, pages) < pages) 426166063Scognet error = ENOMEM; 427166063Scognet } 428166063Scognet /* Performed initial allocation */ 429166063Scognet newtag->flags |= BUS_DMA_MIN_ALLOC_COMP; 430170502Scognet } else 431170502Scognet newtag->bounce_zone = NULL; 432166063Scognet if (error != 0) 433166063Scognet free(newtag, M_DEVBUF); 434166063Scognet else 435166063Scognet *dmat = newtag; 436143294Smux CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d", 437143284Smux __func__, newtag, (newtag != NULL ? newtag->flags : 0), error); 438140313Scognet 439129198Scognet return (error); 440129198Scognet} 441129198Scognet 442129198Scognetint 443129198Scognetbus_dma_tag_destroy(bus_dma_tag_t dmat) 444129198Scognet{ 445140680Scognet#ifdef KTR 446140313Scognet bus_dma_tag_t dmat_copy = dmat; 447140680Scognet#endif 448140313Scognet 449129198Scognet if (dmat != NULL) { 450129198Scognet 451129198Scognet if (dmat->map_count != 0) 452129198Scognet return (EBUSY); 453129198Scognet 454129198Scognet while (dmat != NULL) { 455129198Scognet bus_dma_tag_t parent; 456129198Scognet 457129198Scognet parent = dmat->parent; 458129198Scognet atomic_subtract_int(&dmat->ref_count, 1); 459129198Scognet if (dmat->ref_count == 0) { 460129198Scognet free(dmat, M_DEVBUF); 461129198Scognet /* 462129198Scognet * Last reference count, so 463129198Scognet * release our reference 464129198Scognet * count on our parent. 465129198Scognet */ 466129198Scognet dmat = parent; 467129198Scognet } else 468129198Scognet dmat = NULL; 469129198Scognet } 470129198Scognet } 471143294Smux CTR2(KTR_BUSDMA, "%s tag %p", __func__, dmat_copy); 472140313Scognet 473129198Scognet return (0); 474129198Scognet} 475129198Scognet 476166063Scognet#include <sys/kdb.h> 477129198Scognet/* 478129198Scognet * Allocate a handle for mapping from kva/uva/physical 479129198Scognet * address space into bus device space. 480129198Scognet */ 481129198Scognetint 482129198Scognetbus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp) 483129198Scognet{ 484129198Scognet bus_dmamap_t newmap; 485140313Scognet int error = 0; 486129198Scognet 487146597Scognet newmap = _busdma_alloc_dmamap(); 488140313Scognet if (newmap == NULL) { 489143294Smux CTR3(KTR_BUSDMA, "%s: tag %p error %d", __func__, dmat, ENOMEM); 490129198Scognet return (ENOMEM); 491140313Scognet } 492129198Scognet *mapp = newmap; 493135644Scognet newmap->dmat = dmat; 494161618Scognet newmap->allocbuffer = NULL; 495129198Scognet dmat->map_count++; 496129198Scognet 497166063Scognet /* 498166063Scognet * Bouncing might be required if the driver asks for an active 499166063Scognet * exclusion region, a data alignment that is stricter than 1, and/or 500166063Scognet * an active address boundary. 501166063Scognet */ 502166063Scognet if (dmat->flags & BUS_DMA_COULD_BOUNCE) { 503166063Scognet 504166063Scognet /* Must bounce */ 505166063Scognet struct bounce_zone *bz; 506166063Scognet int maxpages; 507166063Scognet 508166063Scognet if (dmat->bounce_zone == NULL) { 509166063Scognet if ((error = alloc_bounce_zone(dmat)) != 0) { 510166063Scognet _busdma_free_dmamap(newmap); 511166063Scognet *mapp = NULL; 512166063Scognet return (error); 513166063Scognet } 514166063Scognet } 515166063Scognet bz = dmat->bounce_zone; 516166063Scognet 517166063Scognet /* Initialize the new map */ 518166063Scognet STAILQ_INIT(&((*mapp)->bpages)); 519166063Scognet 520166063Scognet /* 521166063Scognet * Attempt to add pages to our pool on a per-instance 522166063Scognet * basis up to a sane limit. 523166063Scognet */ 524166063Scognet maxpages = MAX_BPAGES; 525166063Scognet if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0 526188403Scognet || (bz->map_count > 0 && bz->total_bpages < maxpages)) { 527166063Scognet int pages; 528166063Scognet 529166063Scognet pages = MAX(atop(dmat->maxsize), 1); 530166063Scognet pages = MIN(maxpages - bz->total_bpages, pages); 531166063Scognet pages = MAX(pages, 1); 532166063Scognet if (alloc_bounce_pages(dmat, pages) < pages) 533166063Scognet error = ENOMEM; 534166063Scognet 535166063Scognet if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) { 536166063Scognet if (error == 0) 537166063Scognet dmat->flags |= BUS_DMA_MIN_ALLOC_COMP; 538166063Scognet } else { 539166063Scognet error = 0; 540166063Scognet } 541166063Scognet } 542188403Scognet bz->map_count++; 543166063Scognet } 544143294Smux CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 545143284Smux __func__, dmat, dmat->flags, error); 546140313Scognet 547129198Scognet return (0); 548129198Scognet} 549129198Scognet 550129198Scognet/* 551129198Scognet * Destroy a handle for mapping from kva/uva/physical 552129198Scognet * address space into bus device space. 553129198Scognet */ 554129198Scognetint 555129198Scognetbus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) 556129198Scognet{ 557135644Scognet 558166063Scognet if (STAILQ_FIRST(&map->bpages) != NULL) { 559166063Scognet CTR3(KTR_BUSDMA, "%s: tag %p error %d", 560166063Scognet __func__, dmat, EBUSY); 561166063Scognet return (EBUSY); 562166063Scognet } 563202353Scognet _busdma_free_dmamap(map); 564188403Scognet if (dmat->bounce_zone) 565188403Scognet dmat->bounce_zone->map_count--; 566129198Scognet dmat->map_count--; 567143294Smux CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat); 568129198Scognet return (0); 569129198Scognet} 570129198Scognet 571129198Scognet/* 572129198Scognet * Allocate a piece of memory that can be efficiently mapped into 573129198Scognet * bus device space based on the constraints lited in the dma tag. 574129198Scognet * A dmamap to for use with dmamap_load is also allocated. 575129198Scognet */ 576129198Scognetint 577129198Scognetbus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 578129198Scognet bus_dmamap_t *mapp) 579129198Scognet{ 580135644Scognet bus_dmamap_t newmap = NULL; 581129198Scognet 582129198Scognet int mflags; 583129198Scognet 584129198Scognet if (flags & BUS_DMA_NOWAIT) 585129198Scognet mflags = M_NOWAIT; 586129198Scognet else 587129198Scognet mflags = M_WAITOK; 588129198Scognet if (flags & BUS_DMA_ZERO) 589129198Scognet mflags |= M_ZERO; 590129198Scognet 591146597Scognet newmap = _busdma_alloc_dmamap(); 592143671Sjmg if (newmap == NULL) { 593143671Sjmg CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 594143671Sjmg __func__, dmat, dmat->flags, ENOMEM); 595143671Sjmg return (ENOMEM); 596135644Scognet } 597143671Sjmg dmat->map_count++; 598143671Sjmg *mapp = newmap; 599143671Sjmg newmap->dmat = dmat; 600135644Scognet 601166063Scognet if (dmat->maxsize <= PAGE_SIZE && 602166063Scognet (dmat->alignment < dmat->maxsize) && 603166063Scognet !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr)) { 604129198Scognet *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags); 605129198Scognet } else { 606129198Scognet /* 607129198Scognet * XXX Use Contigmalloc until it is merged into this facility 608129198Scognet * and handles multi-seg allocations. Nobody is doing 609129198Scognet * multi-seg allocations yet though. 610129198Scognet */ 611129198Scognet *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags, 612129198Scognet 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul, 613129198Scognet dmat->boundary); 614129198Scognet } 615140313Scognet if (*vaddr == NULL) { 616140313Scognet if (newmap != NULL) { 617146597Scognet _busdma_free_dmamap(newmap); 618140313Scognet dmat->map_count--; 619140313Scognet } 620129198Scognet *mapp = NULL; 621129198Scognet return (ENOMEM); 622129198Scognet } 623156191Scognet if (flags & BUS_DMA_COHERENT) { 624156191Scognet void *tmpaddr = arm_remap_nocache( 625156191Scognet (void *)((vm_offset_t)*vaddr &~ PAGE_MASK), 626156191Scognet dmat->maxsize + ((vm_offset_t)*vaddr & PAGE_MASK)); 627156191Scognet 628156191Scognet if (tmpaddr) { 629156191Scognet tmpaddr = (void *)((vm_offset_t)(tmpaddr) + 630156191Scognet ((vm_offset_t)*vaddr & PAGE_MASK)); 631156191Scognet newmap->origbuffer = *vaddr; 632156191Scognet newmap->allocbuffer = tmpaddr; 633156191Scognet *vaddr = tmpaddr; 634156191Scognet } else 635156191Scognet newmap->origbuffer = newmap->allocbuffer = NULL; 636156191Scognet } else 637156191Scognet newmap->origbuffer = newmap->allocbuffer = NULL; 638129198Scognet return (0); 639129198Scognet} 640129198Scognet 641129198Scognet/* 642129198Scognet * Free a piece of memory and it's allocated dmamap, that was allocated 643129198Scognet * via bus_dmamem_alloc. Make the same choice for free/contigfree. 644129198Scognet */ 645129198Scognetvoid 646129198Scognetbus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) 647129198Scognet{ 648156191Scognet if (map->allocbuffer) { 649156191Scognet KASSERT(map->allocbuffer == vaddr, 650156191Scognet ("Trying to freeing the wrong DMA buffer")); 651156191Scognet vaddr = map->origbuffer; 652205028Sraj arm_unmap_nocache(map->allocbuffer, 653205028Sraj dmat->maxsize + ((vm_offset_t)vaddr & PAGE_MASK)); 654156191Scognet } 655166063Scognet if (dmat->maxsize <= PAGE_SIZE && 656166063Scognet dmat->alignment < dmat->maxsize && 657166063Scognet !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr)) 658129198Scognet free(vaddr, M_DEVBUF); 659129198Scognet else { 660129198Scognet contigfree(vaddr, dmat->maxsize, M_DEVBUF); 661129198Scognet } 662135644Scognet dmat->map_count--; 663146597Scognet _busdma_free_dmamap(map); 664143294Smux CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags); 665129198Scognet} 666129198Scognet 667166063Scognetstatic int 668191011Skib_bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, pmap_t pmap, 669191011Skib void *buf, bus_size_t buflen, int flags) 670166063Scognet{ 671166063Scognet vm_offset_t vaddr; 672166063Scognet vm_offset_t vendaddr; 673166063Scognet bus_addr_t paddr; 674166063Scognet 675166063Scognet if ((map->pagesneeded == 0)) { 676185494Sstas CTR3(KTR_BUSDMA, "lowaddr= %d, boundary= %d, alignment= %d", 677185494Sstas dmat->lowaddr, dmat->boundary, dmat->alignment); 678170406Scognet CTR2(KTR_BUSDMA, "map= %p, pagesneeded= %d", 679170406Scognet map, map->pagesneeded); 680166063Scognet /* 681166063Scognet * Count the number of bounce pages 682166063Scognet * needed in order to complete this transfer 683166063Scognet */ 684166063Scognet vaddr = trunc_page((vm_offset_t)buf); 685166063Scognet vendaddr = (vm_offset_t)buf + buflen; 686166063Scognet 687166063Scognet while (vaddr < vendaddr) { 688191438Sjhb if (__predict_true(pmap == pmap_kernel())) 689191438Sjhb paddr = pmap_kextract(vaddr); 690191438Sjhb else 691191011Skib paddr = pmap_extract(pmap, vaddr); 692166063Scognet if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && 693173988Sjhb run_filter(dmat, paddr) != 0) 694166063Scognet map->pagesneeded++; 695166063Scognet vaddr += PAGE_SIZE; 696166063Scognet } 697166063Scognet CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); 698166063Scognet } 699166063Scognet 700166063Scognet /* Reserve Necessary Bounce Pages */ 701166063Scognet if (map->pagesneeded != 0) { 702166063Scognet mtx_lock(&bounce_lock); 703166063Scognet if (flags & BUS_DMA_NOWAIT) { 704166063Scognet if (reserve_bounce_pages(dmat, map, 0) != 0) { 705166063Scognet mtx_unlock(&bounce_lock); 706166063Scognet return (ENOMEM); 707166063Scognet } 708166063Scognet } else { 709166063Scognet if (reserve_bounce_pages(dmat, map, 1) != 0) { 710166063Scognet /* Queue us for resources */ 711166063Scognet STAILQ_INSERT_TAIL(&bounce_map_waitinglist, 712166063Scognet map, links); 713166063Scognet mtx_unlock(&bounce_lock); 714166063Scognet return (EINPROGRESS); 715166063Scognet } 716166063Scognet } 717166063Scognet mtx_unlock(&bounce_lock); 718166063Scognet } 719166063Scognet 720166063Scognet return (0); 721166063Scognet} 722166063Scognet 723129198Scognet/* 724129198Scognet * Utility function to load a linear buffer. lastaddrp holds state 725129198Scognet * between invocations (for multiple-buffer loads). segp contains 726129198Scognet * the starting segment on entrance, and the ending segment on exit. 727129198Scognet * first indicates if this is the first invocation of this function. 728129198Scognet */ 729147591Scognetstatic __inline int 730140349Scognetbus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs, 731137758Scognet bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap, 732137760Scognet int flags, vm_offset_t *lastaddrp, int *segp) 733129198Scognet{ 734129198Scognet bus_size_t sgsize; 735129198Scognet bus_addr_t curaddr, lastaddr, baddr, bmask; 736129198Scognet vm_offset_t vaddr = (vm_offset_t)buf; 737129198Scognet int seg; 738129198Scognet int error = 0; 739129198Scognet pd_entry_t *pde; 740129198Scognet pt_entry_t pte; 741129198Scognet pt_entry_t *ptep; 742129198Scognet 743129198Scognet lastaddr = *lastaddrp; 744129198Scognet bmask = ~(dmat->boundary - 1); 745129198Scognet 746166063Scognet if ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) { 747191011Skib error = _bus_dmamap_count_pages(dmat, map, pmap, buf, buflen, 748191011Skib flags); 749166063Scognet if (error) 750166063Scognet return (error); 751166063Scognet } 752140313Scognet CTR3(KTR_BUSDMA, "lowaddr= %d boundary= %d, " 753140313Scognet "alignment= %d", dmat->lowaddr, dmat->boundary, dmat->alignment); 754140313Scognet 755129198Scognet for (seg = *segp; buflen > 0 ; ) { 756129198Scognet /* 757129198Scognet * Get the physical address for this segment. 758129198Scognet * 759129198Scognet * XXX Don't support checking for coherent mappings 760129198Scognet * XXX in user address space. 761129198Scognet */ 762147591Scognet if (__predict_true(pmap == pmap_kernel())) { 763177103Sraj if (pmap_get_pde_pte(pmap, vaddr, &pde, &ptep) == FALSE) 764177103Sraj return (EFAULT); 765177103Sraj 766129198Scognet if (__predict_false(pmap_pde_section(pde))) { 767171623Scognet if (*pde & L1_S_SUPERSEC) 768171623Scognet curaddr = (*pde & L1_SUP_FRAME) | 769171623Scognet (vaddr & L1_SUP_OFFSET); 770171623Scognet else 771171623Scognet curaddr = (*pde & L1_S_FRAME) | 772171623Scognet (vaddr & L1_S_OFFSET); 773129198Scognet if (*pde & L1_S_CACHE_MASK) { 774129198Scognet map->flags &= 775135644Scognet ~DMAMAP_COHERENT; 776129198Scognet } 777129198Scognet } else { 778129198Scognet pte = *ptep; 779129198Scognet KASSERT((pte & L2_TYPE_MASK) != L2_TYPE_INV, 780132514Scognet ("INV type")); 781129198Scognet if (__predict_false((pte & L2_TYPE_MASK) 782129198Scognet == L2_TYPE_L)) { 783129198Scognet curaddr = (pte & L2_L_FRAME) | 784129198Scognet (vaddr & L2_L_OFFSET); 785129198Scognet if (pte & L2_L_CACHE_MASK) { 786129198Scognet map->flags &= 787135644Scognet ~DMAMAP_COHERENT; 788135644Scognet 789129198Scognet } 790129198Scognet } else { 791129198Scognet curaddr = (pte & L2_S_FRAME) | 792129198Scognet (vaddr & L2_S_OFFSET); 793129198Scognet if (pte & L2_S_CACHE_MASK) { 794129198Scognet map->flags &= 795135644Scognet ~DMAMAP_COHERENT; 796129198Scognet } 797129198Scognet } 798129198Scognet } 799129198Scognet } else { 800129198Scognet curaddr = pmap_extract(pmap, vaddr); 801135644Scognet map->flags &= ~DMAMAP_COHERENT; 802129198Scognet } 803129198Scognet 804129198Scognet /* 805129198Scognet * Compute the segment size, and adjust counts. 806129198Scognet */ 807129198Scognet sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK); 808170086Syongari if (sgsize > dmat->maxsegsz) 809170086Syongari sgsize = dmat->maxsegsz; 810129198Scognet if (buflen < sgsize) 811129198Scognet sgsize = buflen; 812129198Scognet 813129198Scognet /* 814129198Scognet * Make sure we don't cross any boundaries. 815129198Scognet */ 816129198Scognet if (dmat->boundary > 0) { 817129198Scognet baddr = (curaddr + dmat->boundary) & bmask; 818129198Scognet if (sgsize > (baddr - curaddr)) 819129198Scognet sgsize = (baddr - curaddr); 820129198Scognet } 821166063Scognet if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && 822166063Scognet map->pagesneeded != 0 && run_filter(dmat, curaddr)) 823166063Scognet curaddr = add_bounce_page(dmat, map, vaddr, sgsize); 824129198Scognet 825166063Scognet if (dmat->ranges) { 826166063Scognet struct arm32_dma_range *dr; 827166063Scognet 828166063Scognet dr = _bus_dma_inrange(dmat->ranges, dmat->_nranges, 829166063Scognet curaddr); 830166063Scognet if (dr == NULL) 831166063Scognet return (EINVAL); 832166063Scognet /* 833166063Scognet * In a valid DMA range. Translate the physical 834166063Scognet * memory address to an address in the DMA window. 835166063Scognet */ 836166063Scognet curaddr = (curaddr - dr->dr_sysbase) + dr->dr_busbase; 837166063Scognet 838166063Scognet } 839166063Scognet 840129198Scognet /* 841129198Scognet * Insert chunk into a segment, coalescing with 842129198Scognet * the previous segment if possible. 843129198Scognet */ 844173988Sjhb if (seg >= 0 && curaddr == lastaddr && 845137760Scognet (segs[seg].ds_len + sgsize) <= dmat->maxsegsz && 846137760Scognet (dmat->boundary == 0 || 847137760Scognet (segs[seg].ds_addr & bmask) == 848137760Scognet (curaddr & bmask))) { 849137760Scognet segs[seg].ds_len += sgsize; 850140349Scognet goto segdone; 851137760Scognet } else { 852137760Scognet if (++seg >= dmat->nsegments) 853137760Scognet break; 854129198Scognet segs[seg].ds_addr = curaddr; 855129198Scognet segs[seg].ds_len = sgsize; 856129198Scognet } 857135644Scognet if (error) 858135644Scognet break; 859135644Scognetsegdone: 860129198Scognet lastaddr = curaddr + sgsize; 861129198Scognet vaddr += sgsize; 862129198Scognet buflen -= sgsize; 863129198Scognet } 864129198Scognet 865129198Scognet *segp = seg; 866129198Scognet *lastaddrp = lastaddr; 867129198Scognet 868129198Scognet /* 869129198Scognet * Did we fit? 870129198Scognet */ 871129198Scognet if (buflen != 0) 872129198Scognet error = EFBIG; /* XXX better return value here? */ 873129198Scognet return (error); 874129198Scognet} 875129198Scognet 876129198Scognet/* 877140682Scognet * Map the buffer buf into bus space using the dmamap map. 878140682Scognet */ 879140682Scognetint 880140682Scognetbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 881140682Scognet bus_size_t buflen, bus_dmamap_callback_t *callback, 882140682Scognet void *callback_arg, int flags) 883140682Scognet{ 884140682Scognet vm_offset_t lastaddr = 0; 885140682Scognet int error, nsegs = -1; 886143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 887140682Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 888140682Scognet#else 889140682Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 890140682Scognet#endif 891140682Scognet 892143671Sjmg KASSERT(dmat != NULL, ("dmatag is NULL")); 893143671Sjmg KASSERT(map != NULL, ("dmamap is NULL")); 894166063Scognet map->callback = callback; 895166063Scognet map->callback_arg = callback_arg; 896140682Scognet map->flags &= ~DMAMAP_TYPE_MASK; 897140682Scognet map->flags |= DMAMAP_LINEAR|DMAMAP_COHERENT; 898140682Scognet map->buffer = buf; 899140682Scognet map->len = buflen; 900140682Scognet error = bus_dmamap_load_buffer(dmat, 901140682Scognet dm_segments, map, buf, buflen, kernel_pmap, 902140682Scognet flags, &lastaddr, &nsegs); 903166063Scognet if (error == EINPROGRESS) 904166063Scognet return (error); 905140682Scognet if (error) 906140682Scognet (*callback)(callback_arg, NULL, 0, error); 907140682Scognet else 908140682Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, error); 909140682Scognet 910143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 911143284Smux __func__, dmat, dmat->flags, nsegs + 1, error); 912140682Scognet 913177103Sraj return (error); 914140682Scognet} 915140682Scognet 916140682Scognet/* 917129198Scognet * Like bus_dmamap_load(), but for mbufs. 918129198Scognet */ 919129198Scognetint 920129198Scognetbus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 921129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 922129198Scognet int flags) 923129198Scognet{ 924143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 925129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 926129198Scognet#else 927129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 928129198Scognet#endif 929137760Scognet int nsegs = -1, error = 0; 930129198Scognet 931129198Scognet M_ASSERTPKTHDR(m0); 932129198Scognet 933135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 934135644Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 935135644Scognet map->buffer = m0; 936146597Scognet map->len = 0; 937129198Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 938129198Scognet vm_offset_t lastaddr = 0; 939129198Scognet struct mbuf *m; 940129198Scognet 941129198Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 942146597Scognet if (m->m_len > 0) { 943129198Scognet error = bus_dmamap_load_buffer(dmat, 944137758Scognet dm_segments, map, m->m_data, m->m_len, 945137760Scognet pmap_kernel(), flags, &lastaddr, &nsegs); 946146597Scognet map->len += m->m_len; 947146597Scognet } 948129198Scognet } 949129198Scognet } else { 950129198Scognet error = EINVAL; 951129198Scognet } 952129198Scognet 953129198Scognet if (error) { 954129198Scognet /* 955129198Scognet * force "no valid mappings" on error in callback. 956129198Scognet */ 957129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 958129198Scognet } else { 959135644Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, 960129198Scognet m0->m_pkthdr.len, error); 961129198Scognet } 962143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 963143284Smux __func__, dmat, dmat->flags, error, nsegs + 1); 964140313Scognet 965129198Scognet return (error); 966129198Scognet} 967129198Scognet 968140310Scognetint 969140310Scognetbus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 970140310Scognet struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, 971140310Scognet int flags) 972140310Scognet{ 973140310Scognet int error = 0; 974140310Scognet M_ASSERTPKTHDR(m0); 975140310Scognet 976140310Scognet flags |= BUS_DMA_NOWAIT; 977140310Scognet *nsegs = -1; 978140349Scognet map->flags &= ~DMAMAP_TYPE_MASK; 979140349Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 980140349Scognet map->buffer = m0; 981146597Scognet map->len = 0; 982140310Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 983140310Scognet vm_offset_t lastaddr = 0; 984140310Scognet struct mbuf *m; 985140310Scognet 986140310Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 987140310Scognet if (m->m_len > 0) { 988140310Scognet error = bus_dmamap_load_buffer(dmat, segs, map, 989140310Scognet m->m_data, m->m_len, 990140310Scognet pmap_kernel(), flags, &lastaddr, 991140310Scognet nsegs); 992146597Scognet map->len += m->m_len; 993140310Scognet } 994140310Scognet } 995140310Scognet } else { 996140310Scognet error = EINVAL; 997140310Scognet } 998140310Scognet 999140310Scognet /* XXX FIXME: Having to increment nsegs is really annoying */ 1000140310Scognet ++*nsegs; 1001143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 1002143284Smux __func__, dmat, dmat->flags, error, *nsegs); 1003140310Scognet return (error); 1004140310Scognet} 1005140310Scognet 1006129198Scognet/* 1007129198Scognet * Like bus_dmamap_load(), but for uios. 1008129198Scognet */ 1009129198Scognetint 1010129198Scognetbus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 1011129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 1012129198Scognet int flags) 1013129198Scognet{ 1014169761Scognet vm_offset_t lastaddr = 0; 1015143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1016129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 1017129198Scognet#else 1018129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 1019129198Scognet#endif 1020137760Scognet int nsegs, i, error; 1021129198Scognet bus_size_t resid; 1022129198Scognet struct iovec *iov; 1023137758Scognet struct pmap *pmap; 1024129198Scognet 1025129198Scognet resid = uio->uio_resid; 1026129198Scognet iov = uio->uio_iov; 1027135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 1028135644Scognet map->flags |= DMAMAP_UIO|DMAMAP_COHERENT; 1029135644Scognet map->buffer = uio; 1030146597Scognet map->len = 0; 1031129198Scognet 1032129198Scognet if (uio->uio_segflg == UIO_USERSPACE) { 1033138683Scognet KASSERT(uio->uio_td != NULL, 1034138683Scognet ("bus_dmamap_load_uio: USERSPACE but no proc")); 1035137758Scognet pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); 1036137758Scognet } else 1037137758Scognet pmap = kernel_pmap; 1038129198Scognet 1039137760Scognet error = 0; 1040137760Scognet nsegs = -1; 1041129198Scognet for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { 1042129198Scognet /* 1043129198Scognet * Now at the first iovec to load. Load each iovec 1044129198Scognet * until we have exhausted the residual count. 1045129198Scognet */ 1046129198Scognet bus_size_t minlen = 1047129198Scognet resid < iov[i].iov_len ? resid : iov[i].iov_len; 1048129198Scognet caddr_t addr = (caddr_t) iov[i].iov_base; 1049129198Scognet 1050129198Scognet if (minlen > 0) { 1051129198Scognet error = bus_dmamap_load_buffer(dmat, dm_segments, map, 1052137760Scognet addr, minlen, pmap, flags, &lastaddr, &nsegs); 1053129198Scognet 1054146597Scognet map->len += minlen; 1055129198Scognet resid -= minlen; 1056129198Scognet } 1057129198Scognet } 1058129198Scognet 1059129198Scognet if (error) { 1060129198Scognet /* 1061129198Scognet * force "no valid mappings" on error in callback. 1062129198Scognet */ 1063129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 1064129198Scognet } else { 1065129198Scognet (*callback)(callback_arg, dm_segments, nsegs+1, 1066129198Scognet uio->uio_resid, error); 1067129198Scognet } 1068129198Scognet 1069143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 1070143284Smux __func__, dmat, dmat->flags, error, nsegs + 1); 1071129198Scognet return (error); 1072129198Scognet} 1073129198Scognet 1074129198Scognet/* 1075135644Scognet * Release the mapping held by map. 1076129198Scognet */ 1077129198Scognetvoid 1078143655Sjmg_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) 1079150893Scognet{ 1080166063Scognet struct bounce_page *bpage; 1081166063Scognet 1082135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 1083166063Scognet while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) { 1084166063Scognet STAILQ_REMOVE_HEAD(&map->bpages, links); 1085166063Scognet free_bounce_page(dmat, bpage); 1086166063Scognet } 1087129198Scognet return; 1088129198Scognet} 1089129198Scognet 1090169761Scognetstatic void 1091135644Scognetbus_dmamap_sync_buf(void *buf, int len, bus_dmasync_op_t op) 1092135644Scognet{ 1093166063Scognet char _tmp_cl[arm_dcache_align], _tmp_clend[arm_dcache_align]; 1094135644Scognet 1095171890Scognet if ((op & BUS_DMASYNC_PREWRITE) && !(op & BUS_DMASYNC_PREREAD)) { 1096135644Scognet cpu_dcache_wb_range((vm_offset_t)buf, len); 1097171623Scognet cpu_l2cache_wb_range((vm_offset_t)buf, len); 1098171623Scognet } 1099171623Scognet if (op & BUS_DMASYNC_PREREAD) { 1100174051Scognet if (!(op & BUS_DMASYNC_PREWRITE) && 1101171890Scognet ((((vm_offset_t)(buf) | len) & arm_dcache_align_mask) == 0)) { 1102171890Scognet cpu_dcache_inv_range((vm_offset_t)buf, len); 1103171890Scognet cpu_l2cache_inv_range((vm_offset_t)buf, len); 1104171890Scognet } else { 1105171890Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 1106171890Scognet cpu_l2cache_wbinv_range((vm_offset_t)buf, len); 1107171890Scognet } 1108171623Scognet } 1109166063Scognet if (op & BUS_DMASYNC_POSTREAD) { 1110171623Scognet if ((vm_offset_t)buf & arm_dcache_align_mask) { 1111166063Scognet memcpy(_tmp_cl, (void *)((vm_offset_t)buf & ~ 1112166063Scognet arm_dcache_align_mask), 1113171623Scognet (vm_offset_t)buf & arm_dcache_align_mask); 1114171623Scognet } 1115171623Scognet if (((vm_offset_t)buf + len) & arm_dcache_align_mask) { 1116171623Scognet memcpy(_tmp_clend, (void *)((vm_offset_t)buf + len), 1117171623Scognet arm_dcache_align - (((vm_offset_t)(buf) + len) & 1118171623Scognet arm_dcache_align_mask)); 1119171623Scognet } 1120166063Scognet cpu_dcache_inv_range((vm_offset_t)buf, len); 1121171623Scognet cpu_l2cache_inv_range((vm_offset_t)buf, len); 1122171623Scognet 1123166063Scognet if ((vm_offset_t)buf & arm_dcache_align_mask) 1124166063Scognet memcpy((void *)((vm_offset_t)buf & 1125171623Scognet ~arm_dcache_align_mask), _tmp_cl, 1126171623Scognet (vm_offset_t)buf & arm_dcache_align_mask); 1127166063Scognet if (((vm_offset_t)buf + len) & arm_dcache_align_mask) 1128171623Scognet memcpy((void *)((vm_offset_t)buf + len), _tmp_clend, 1129171623Scognet arm_dcache_align - (((vm_offset_t)(buf) + len) & 1130171623Scognet arm_dcache_align_mask)); 1131135644Scognet } 1132135644Scognet} 1133135644Scognet 1134166063Scognetstatic void 1135166063Scognet_bus_dmamap_sync_bp(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 1136166063Scognet{ 1137166063Scognet struct bounce_page *bpage; 1138166063Scognet 1139166063Scognet STAILQ_FOREACH(bpage, &map->bpages, links) { 1140166063Scognet if (op & BUS_DMASYNC_PREWRITE) { 1141166063Scognet bcopy((void *)bpage->datavaddr, 1142166063Scognet (void *)(bpage->vaddr_nocache != 0 ? 1143166063Scognet bpage->vaddr_nocache : bpage->vaddr), 1144166063Scognet bpage->datacount); 1145171623Scognet if (bpage->vaddr_nocache == 0) { 1146166063Scognet cpu_dcache_wb_range(bpage->vaddr, 1147166063Scognet bpage->datacount); 1148171623Scognet cpu_l2cache_wb_range(bpage->vaddr, 1149171623Scognet bpage->datacount); 1150171623Scognet } 1151187911Sthompsa dmat->bounce_zone->total_bounced++; 1152166063Scognet } 1153166063Scognet if (op & BUS_DMASYNC_POSTREAD) { 1154171623Scognet if (bpage->vaddr_nocache == 0) { 1155166063Scognet cpu_dcache_inv_range(bpage->vaddr, 1156166063Scognet bpage->datacount); 1157171623Scognet cpu_l2cache_inv_range(bpage->vaddr, 1158171623Scognet bpage->datacount); 1159171623Scognet } 1160166063Scognet bcopy((void *)(bpage->vaddr_nocache != 0 ? 1161166063Scognet bpage->vaddr_nocache : bpage->vaddr), 1162166063Scognet (void *)bpage->datavaddr, bpage->datacount); 1163187911Sthompsa dmat->bounce_zone->total_bounced++; 1164166063Scognet } 1165166063Scognet } 1166166063Scognet} 1167166063Scognet 1168166063Scognetstatic __inline int 1169166063Scognet_bus_dma_buf_is_in_bp(bus_dmamap_t map, void *buf, int len) 1170166063Scognet{ 1171166063Scognet struct bounce_page *bpage; 1172166063Scognet 1173166063Scognet STAILQ_FOREACH(bpage, &map->bpages, links) { 1174166063Scognet if ((vm_offset_t)buf >= bpage->datavaddr && 1175188112Scognet (vm_offset_t)buf + len <= bpage->datavaddr + 1176166063Scognet bpage->datacount) 1177166063Scognet return (1); 1178166063Scognet } 1179166063Scognet return (0); 1180166063Scognet 1181166063Scognet} 1182166063Scognet 1183129198Scognetvoid 1184143655Sjmg_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 1185129198Scognet{ 1186135644Scognet struct mbuf *m; 1187135644Scognet struct uio *uio; 1188135644Scognet int resid; 1189135644Scognet struct iovec *iov; 1190135644Scognet 1191159107Scognet if (op == BUS_DMASYNC_POSTWRITE) 1192129198Scognet return; 1193166063Scognet if (STAILQ_FIRST(&map->bpages)) 1194166063Scognet _bus_dmamap_sync_bp(dmat, map, op); 1195150893Scognet if (map->flags & DMAMAP_COHERENT) 1196129198Scognet return; 1197143294Smux CTR3(KTR_BUSDMA, "%s: op %x flags %x", __func__, op, map->flags); 1198135644Scognet switch(map->flags & DMAMAP_TYPE_MASK) { 1199135644Scognet case DMAMAP_LINEAR: 1200166063Scognet if (!(_bus_dma_buf_is_in_bp(map, map->buffer, map->len))) 1201166063Scognet bus_dmamap_sync_buf(map->buffer, map->len, op); 1202135644Scognet break; 1203135644Scognet case DMAMAP_MBUF: 1204135644Scognet m = map->buffer; 1205135644Scognet while (m) { 1206166063Scognet if (m->m_len > 0 && 1207166063Scognet !(_bus_dma_buf_is_in_bp(map, m->m_data, m->m_len))) 1208147591Scognet bus_dmamap_sync_buf(m->m_data, m->m_len, op); 1209135644Scognet m = m->m_next; 1210135644Scognet } 1211135644Scognet break; 1212135644Scognet case DMAMAP_UIO: 1213135644Scognet uio = map->buffer; 1214135644Scognet iov = uio->uio_iov; 1215135644Scognet resid = uio->uio_resid; 1216135644Scognet for (int i = 0; i < uio->uio_iovcnt && resid != 0; i++) { 1217135644Scognet bus_size_t minlen = resid < iov[i].iov_len ? resid : 1218135644Scognet iov[i].iov_len; 1219135644Scognet if (minlen > 0) { 1220166063Scognet if (!_bus_dma_buf_is_in_bp(map, iov[i].iov_base, 1221166063Scognet minlen)) 1222166063Scognet bus_dmamap_sync_buf(iov[i].iov_base, 1223166063Scognet minlen, op); 1224135644Scognet resid -= minlen; 1225135644Scognet } 1226135644Scognet } 1227135644Scognet break; 1228135644Scognet default: 1229135644Scognet break; 1230129198Scognet } 1231135644Scognet cpu_drain_writebuf(); 1232129198Scognet} 1233166063Scognet 1234166063Scognetstatic void 1235166063Scognetinit_bounce_pages(void *dummy __unused) 1236166063Scognet{ 1237166063Scognet 1238166063Scognet total_bpages = 0; 1239166063Scognet STAILQ_INIT(&bounce_zone_list); 1240166063Scognet STAILQ_INIT(&bounce_map_waitinglist); 1241166063Scognet STAILQ_INIT(&bounce_map_callbacklist); 1242166063Scognet mtx_init(&bounce_lock, "bounce pages lock", NULL, MTX_DEF); 1243166063Scognet} 1244166063ScognetSYSINIT(bpages, SI_SUB_LOCK, SI_ORDER_ANY, init_bounce_pages, NULL); 1245166063Scognet 1246166063Scognetstatic struct sysctl_ctx_list * 1247166063Scognetbusdma_sysctl_tree(struct bounce_zone *bz) 1248166063Scognet{ 1249166063Scognet return (&bz->sysctl_tree); 1250166063Scognet} 1251166063Scognet 1252166063Scognetstatic struct sysctl_oid * 1253166063Scognetbusdma_sysctl_tree_top(struct bounce_zone *bz) 1254166063Scognet{ 1255166063Scognet return (bz->sysctl_tree_top); 1256166063Scognet} 1257166063Scognet 1258166063Scognetstatic int 1259166063Scognetalloc_bounce_zone(bus_dma_tag_t dmat) 1260166063Scognet{ 1261166063Scognet struct bounce_zone *bz; 1262166063Scognet 1263166063Scognet /* Check to see if we already have a suitable zone */ 1264166063Scognet STAILQ_FOREACH(bz, &bounce_zone_list, links) { 1265166063Scognet if ((dmat->alignment <= bz->alignment) 1266166063Scognet && (dmat->lowaddr >= bz->lowaddr)) { 1267166063Scognet dmat->bounce_zone = bz; 1268166063Scognet return (0); 1269166063Scognet } 1270166063Scognet } 1271166063Scognet 1272166063Scognet if ((bz = (struct bounce_zone *)malloc(sizeof(*bz), M_DEVBUF, 1273166063Scognet M_NOWAIT | M_ZERO)) == NULL) 1274166063Scognet return (ENOMEM); 1275166063Scognet 1276166063Scognet STAILQ_INIT(&bz->bounce_page_list); 1277166063Scognet bz->free_bpages = 0; 1278166063Scognet bz->reserved_bpages = 0; 1279166063Scognet bz->active_bpages = 0; 1280166063Scognet bz->lowaddr = dmat->lowaddr; 1281191438Sjhb bz->alignment = MAX(dmat->alignment, PAGE_SIZE); 1282188403Scognet bz->map_count = 0; 1283166063Scognet snprintf(bz->zoneid, 8, "zone%d", busdma_zonecount); 1284166063Scognet busdma_zonecount++; 1285166063Scognet snprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr); 1286166063Scognet STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links); 1287166063Scognet dmat->bounce_zone = bz; 1288166063Scognet 1289166063Scognet sysctl_ctx_init(&bz->sysctl_tree); 1290166063Scognet bz->sysctl_tree_top = SYSCTL_ADD_NODE(&bz->sysctl_tree, 1291166063Scognet SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid, 1292166063Scognet CTLFLAG_RD, 0, ""); 1293166063Scognet if (bz->sysctl_tree_top == NULL) { 1294166063Scognet sysctl_ctx_free(&bz->sysctl_tree); 1295166063Scognet return (0); /* XXX error code? */ 1296166063Scognet } 1297166063Scognet 1298166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1299166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1300166063Scognet "total_bpages", CTLFLAG_RD, &bz->total_bpages, 0, 1301166063Scognet "Total bounce pages"); 1302166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1303166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1304166063Scognet "free_bpages", CTLFLAG_RD, &bz->free_bpages, 0, 1305166063Scognet "Free bounce pages"); 1306166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1307166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1308166063Scognet "reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0, 1309166063Scognet "Reserved bounce pages"); 1310166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1311166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1312166063Scognet "active_bpages", CTLFLAG_RD, &bz->active_bpages, 0, 1313166063Scognet "Active bounce pages"); 1314166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1315166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1316166063Scognet "total_bounced", CTLFLAG_RD, &bz->total_bounced, 0, 1317166063Scognet "Total bounce requests"); 1318166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1319166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1320166063Scognet "total_deferred", CTLFLAG_RD, &bz->total_deferred, 0, 1321166063Scognet "Total bounce requests that were deferred"); 1322166063Scognet SYSCTL_ADD_STRING(busdma_sysctl_tree(bz), 1323166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1324166063Scognet "lowaddr", CTLFLAG_RD, bz->lowaddrid, 0, ""); 1325166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1326166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1327166063Scognet "alignment", CTLFLAG_RD, &bz->alignment, 0, ""); 1328166063Scognet 1329166063Scognet return (0); 1330166063Scognet} 1331166063Scognet 1332166063Scognetstatic int 1333166063Scognetalloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages) 1334166063Scognet{ 1335166063Scognet struct bounce_zone *bz; 1336166063Scognet int count; 1337166063Scognet 1338166063Scognet bz = dmat->bounce_zone; 1339166063Scognet count = 0; 1340166063Scognet while (numpages > 0) { 1341166063Scognet struct bounce_page *bpage; 1342166063Scognet 1343166063Scognet bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF, 1344166063Scognet M_NOWAIT | M_ZERO); 1345166063Scognet 1346166063Scognet if (bpage == NULL) 1347166063Scognet break; 1348166063Scognet bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF, 1349166063Scognet M_NOWAIT, 0ul, 1350166063Scognet bz->lowaddr, 1351166063Scognet PAGE_SIZE, 1352191438Sjhb 0); 1353166063Scognet if (bpage->vaddr == 0) { 1354166063Scognet free(bpage, M_DEVBUF); 1355166063Scognet break; 1356166063Scognet } 1357166063Scognet bpage->busaddr = pmap_kextract(bpage->vaddr); 1358166063Scognet bpage->vaddr_nocache = (vm_offset_t)arm_remap_nocache( 1359166063Scognet (void *)bpage->vaddr, PAGE_SIZE); 1360166063Scognet mtx_lock(&bounce_lock); 1361166063Scognet STAILQ_INSERT_TAIL(&bz->bounce_page_list, bpage, links); 1362166063Scognet total_bpages++; 1363166063Scognet bz->total_bpages++; 1364166063Scognet bz->free_bpages++; 1365166063Scognet mtx_unlock(&bounce_lock); 1366166063Scognet count++; 1367166063Scognet numpages--; 1368166063Scognet } 1369166063Scognet return (count); 1370166063Scognet} 1371166063Scognet 1372166063Scognetstatic int 1373166063Scognetreserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, int commit) 1374166063Scognet{ 1375166063Scognet struct bounce_zone *bz; 1376166063Scognet int pages; 1377166063Scognet 1378166063Scognet mtx_assert(&bounce_lock, MA_OWNED); 1379166063Scognet bz = dmat->bounce_zone; 1380166063Scognet pages = MIN(bz->free_bpages, map->pagesneeded - map->pagesreserved); 1381166063Scognet if (commit == 0 && map->pagesneeded > (map->pagesreserved + pages)) 1382166063Scognet return (map->pagesneeded - (map->pagesreserved + pages)); 1383166063Scognet bz->free_bpages -= pages; 1384166063Scognet bz->reserved_bpages += pages; 1385166063Scognet map->pagesreserved += pages; 1386166063Scognet pages = map->pagesneeded - map->pagesreserved; 1387166063Scognet 1388166063Scognet return (pages); 1389166063Scognet} 1390166063Scognet 1391166063Scognetstatic bus_addr_t 1392166063Scognetadd_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr, 1393166063Scognet bus_size_t size) 1394166063Scognet{ 1395166063Scognet struct bounce_zone *bz; 1396166063Scognet struct bounce_page *bpage; 1397166063Scognet 1398166063Scognet KASSERT(dmat->bounce_zone != NULL, ("no bounce zone in dma tag")); 1399170406Scognet KASSERT(map != NULL, ("add_bounce_page: bad map %p", map)); 1400166063Scognet 1401166063Scognet bz = dmat->bounce_zone; 1402166063Scognet if (map->pagesneeded == 0) 1403166063Scognet panic("add_bounce_page: map doesn't need any pages"); 1404166063Scognet map->pagesneeded--; 1405166063Scognet 1406166063Scognet if (map->pagesreserved == 0) 1407166063Scognet panic("add_bounce_page: map doesn't need any pages"); 1408166063Scognet map->pagesreserved--; 1409166063Scognet 1410166063Scognet mtx_lock(&bounce_lock); 1411166063Scognet bpage = STAILQ_FIRST(&bz->bounce_page_list); 1412166063Scognet if (bpage == NULL) 1413166063Scognet panic("add_bounce_page: free page list is empty"); 1414166063Scognet 1415166063Scognet STAILQ_REMOVE_HEAD(&bz->bounce_page_list, links); 1416166063Scognet bz->reserved_bpages--; 1417166063Scognet bz->active_bpages++; 1418166063Scognet mtx_unlock(&bounce_lock); 1419166063Scognet 1420188350Simp if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) { 1421191201Sjhb /* Page offset needs to be preserved. */ 1422188350Simp bpage->vaddr |= vaddr & PAGE_MASK; 1423188350Simp bpage->busaddr |= vaddr & PAGE_MASK; 1424188350Simp } 1425166063Scognet bpage->datavaddr = vaddr; 1426166063Scognet bpage->datacount = size; 1427166063Scognet STAILQ_INSERT_TAIL(&(map->bpages), bpage, links); 1428166063Scognet return (bpage->busaddr); 1429166063Scognet} 1430166063Scognet 1431166063Scognetstatic void 1432166063Scognetfree_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage) 1433166063Scognet{ 1434166063Scognet struct bus_dmamap *map; 1435166063Scognet struct bounce_zone *bz; 1436166063Scognet 1437166063Scognet bz = dmat->bounce_zone; 1438166063Scognet bpage->datavaddr = 0; 1439166063Scognet bpage->datacount = 0; 1440191201Sjhb if (dmat->flags & BUS_DMA_KEEP_PG_OFFSET) { 1441191201Sjhb /* 1442191201Sjhb * Reset the bounce page to start at offset 0. Other uses 1443191201Sjhb * of this bounce page may need to store a full page of 1444191201Sjhb * data and/or assume it starts on a page boundary. 1445191201Sjhb */ 1446191201Sjhb bpage->vaddr &= ~PAGE_MASK; 1447191201Sjhb bpage->busaddr &= ~PAGE_MASK; 1448191201Sjhb } 1449166063Scognet 1450166063Scognet mtx_lock(&bounce_lock); 1451166063Scognet STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links); 1452166063Scognet bz->free_bpages++; 1453166063Scognet bz->active_bpages--; 1454166063Scognet if ((map = STAILQ_FIRST(&bounce_map_waitinglist)) != NULL) { 1455166063Scognet if (reserve_bounce_pages(map->dmat, map, 1) == 0) { 1456166063Scognet STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links); 1457166063Scognet STAILQ_INSERT_TAIL(&bounce_map_callbacklist, 1458166063Scognet map, links); 1459166063Scognet busdma_swi_pending = 1; 1460166063Scognet bz->total_deferred++; 1461166063Scognet swi_sched(vm_ih, 0); 1462166063Scognet } 1463166063Scognet } 1464166063Scognet mtx_unlock(&bounce_lock); 1465166063Scognet} 1466166063Scognet 1467166063Scognetvoid 1468166063Scognetbusdma_swi(void) 1469166063Scognet{ 1470166063Scognet bus_dma_tag_t dmat; 1471166063Scognet struct bus_dmamap *map; 1472166063Scognet 1473166063Scognet mtx_lock(&bounce_lock); 1474166063Scognet while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) { 1475166063Scognet STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links); 1476166063Scognet mtx_unlock(&bounce_lock); 1477166063Scognet dmat = map->dmat; 1478166063Scognet (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_LOCK); 1479166063Scognet bus_dmamap_load(map->dmat, map, map->buffer, map->len, 1480166063Scognet map->callback, map->callback_arg, /*flags*/0); 1481166063Scognet (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_UNLOCK); 1482166063Scognet mtx_lock(&bounce_lock); 1483166063Scognet } 1484166063Scognet mtx_unlock(&bounce_lock); 1485166063Scognet} 1486