busdma_machdep-v4.c revision 185494
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 185494 2008-11-30 22:58:27Z stas $"); 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; 71129198Scognet bus_size_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; 115166063Scognet bus_size_t alignment; 116166063Scognet bus_size_t boundary; 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 129166063ScognetSYSCTL_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, 335129198Scognet bus_size_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) { 381129198Scognet newtag->lowaddr = min(parent->lowaddr, newtag->lowaddr); 382129198Scognet newtag->highaddr = max(parent->highaddr, newtag->highaddr); 383134934Sscottl if (newtag->boundary == 0) 384134934Sscottl newtag->boundary = parent->boundary; 385134934Sscottl else if (parent->boundary != 0) 386134934Sscottl 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 526166063Scognet || (dmat->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 } 542166063Scognet } 543143294Smux CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 544143284Smux __func__, dmat, dmat->flags, error); 545140313Scognet 546129198Scognet return (0); 547129198Scognet} 548129198Scognet 549129198Scognet/* 550129198Scognet * Destroy a handle for mapping from kva/uva/physical 551129198Scognet * address space into bus device space. 552129198Scognet */ 553129198Scognetint 554129198Scognetbus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map) 555129198Scognet{ 556135644Scognet 557146597Scognet _busdma_free_dmamap(map); 558166063Scognet if (STAILQ_FIRST(&map->bpages) != NULL) { 559166063Scognet CTR3(KTR_BUSDMA, "%s: tag %p error %d", 560166063Scognet __func__, dmat, EBUSY); 561166063Scognet return (EBUSY); 562166063Scognet } 563129198Scognet dmat->map_count--; 564143294Smux CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat); 565129198Scognet return (0); 566129198Scognet} 567129198Scognet 568129198Scognet/* 569129198Scognet * Allocate a piece of memory that can be efficiently mapped into 570129198Scognet * bus device space based on the constraints lited in the dma tag. 571129198Scognet * A dmamap to for use with dmamap_load is also allocated. 572129198Scognet */ 573129198Scognetint 574129198Scognetbus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 575129198Scognet bus_dmamap_t *mapp) 576129198Scognet{ 577135644Scognet bus_dmamap_t newmap = NULL; 578129198Scognet 579129198Scognet int mflags; 580129198Scognet 581129198Scognet if (flags & BUS_DMA_NOWAIT) 582129198Scognet mflags = M_NOWAIT; 583129198Scognet else 584129198Scognet mflags = M_WAITOK; 585129198Scognet if (flags & BUS_DMA_ZERO) 586129198Scognet mflags |= M_ZERO; 587129198Scognet 588146597Scognet newmap = _busdma_alloc_dmamap(); 589143671Sjmg if (newmap == NULL) { 590143671Sjmg CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d", 591143671Sjmg __func__, dmat, dmat->flags, ENOMEM); 592143671Sjmg return (ENOMEM); 593135644Scognet } 594143671Sjmg dmat->map_count++; 595143671Sjmg *mapp = newmap; 596143671Sjmg newmap->dmat = dmat; 597135644Scognet 598166063Scognet if (dmat->maxsize <= PAGE_SIZE && 599166063Scognet (dmat->alignment < dmat->maxsize) && 600166063Scognet !_bus_dma_can_bounce(dmat->lowaddr, dmat->highaddr)) { 601129198Scognet *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags); 602129198Scognet } else { 603129198Scognet /* 604129198Scognet * XXX Use Contigmalloc until it is merged into this facility 605129198Scognet * and handles multi-seg allocations. Nobody is doing 606129198Scognet * multi-seg allocations yet though. 607129198Scognet */ 608129198Scognet *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags, 609129198Scognet 0ul, dmat->lowaddr, dmat->alignment? dmat->alignment : 1ul, 610129198Scognet dmat->boundary); 611129198Scognet } 612140313Scognet if (*vaddr == NULL) { 613140313Scognet if (newmap != NULL) { 614146597Scognet _busdma_free_dmamap(newmap); 615140313Scognet dmat->map_count--; 616140313Scognet } 617129198Scognet *mapp = NULL; 618129198Scognet return (ENOMEM); 619129198Scognet } 620156191Scognet if (flags & BUS_DMA_COHERENT) { 621156191Scognet void *tmpaddr = arm_remap_nocache( 622156191Scognet (void *)((vm_offset_t)*vaddr &~ PAGE_MASK), 623156191Scognet dmat->maxsize + ((vm_offset_t)*vaddr & PAGE_MASK)); 624156191Scognet 625156191Scognet if (tmpaddr) { 626156191Scognet tmpaddr = (void *)((vm_offset_t)(tmpaddr) + 627156191Scognet ((vm_offset_t)*vaddr & PAGE_MASK)); 628156191Scognet newmap->origbuffer = *vaddr; 629156191Scognet newmap->allocbuffer = tmpaddr; 630156191Scognet cpu_idcache_wbinv_range((vm_offset_t)*vaddr, 631156191Scognet dmat->maxsize); 632183838Sraj cpu_l2cache_wbinv_range((vm_offset_t)*vaddr, 633183838Sraj dmat->maxsize); 634156191Scognet *vaddr = tmpaddr; 635156191Scognet } else 636156191Scognet newmap->origbuffer = newmap->allocbuffer = NULL; 637156191Scognet } else 638156191Scognet newmap->origbuffer = newmap->allocbuffer = NULL; 639129198Scognet return (0); 640129198Scognet} 641129198Scognet 642129198Scognet/* 643129198Scognet * Free a piece of memory and it's allocated dmamap, that was allocated 644129198Scognet * via bus_dmamem_alloc. Make the same choice for free/contigfree. 645129198Scognet */ 646129198Scognetvoid 647129198Scognetbus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map) 648129198Scognet{ 649156191Scognet if (map->allocbuffer) { 650156191Scognet KASSERT(map->allocbuffer == vaddr, 651156191Scognet ("Trying to freeing the wrong DMA buffer")); 652156191Scognet vaddr = map->origbuffer; 653156191Scognet arm_unmap_nocache(map->allocbuffer, dmat->maxsize); 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 668166063Scognet_bus_dmamap_count_pages(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 669173988Sjhb 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) { 688166063Scognet paddr = pmap_kextract(vaddr); 689166063Scognet if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && 690173988Sjhb run_filter(dmat, paddr) != 0) 691166063Scognet map->pagesneeded++; 692166063Scognet vaddr += PAGE_SIZE; 693166063Scognet } 694166063Scognet CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded); 695166063Scognet } 696166063Scognet 697166063Scognet /* Reserve Necessary Bounce Pages */ 698166063Scognet if (map->pagesneeded != 0) { 699166063Scognet mtx_lock(&bounce_lock); 700166063Scognet if (flags & BUS_DMA_NOWAIT) { 701166063Scognet if (reserve_bounce_pages(dmat, map, 0) != 0) { 702166063Scognet mtx_unlock(&bounce_lock); 703166063Scognet return (ENOMEM); 704166063Scognet } 705166063Scognet } else { 706166063Scognet if (reserve_bounce_pages(dmat, map, 1) != 0) { 707166063Scognet /* Queue us for resources */ 708166063Scognet STAILQ_INSERT_TAIL(&bounce_map_waitinglist, 709166063Scognet map, links); 710166063Scognet mtx_unlock(&bounce_lock); 711166063Scognet return (EINPROGRESS); 712166063Scognet } 713166063Scognet } 714166063Scognet mtx_unlock(&bounce_lock); 715166063Scognet } 716166063Scognet 717166063Scognet return (0); 718166063Scognet} 719166063Scognet 720129198Scognet/* 721129198Scognet * Utility function to load a linear buffer. lastaddrp holds state 722129198Scognet * between invocations (for multiple-buffer loads). segp contains 723129198Scognet * the starting segment on entrance, and the ending segment on exit. 724129198Scognet * first indicates if this is the first invocation of this function. 725129198Scognet */ 726147591Scognetstatic __inline int 727140349Scognetbus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dma_segment_t *segs, 728137758Scognet bus_dmamap_t map, void *buf, bus_size_t buflen, struct pmap *pmap, 729137760Scognet int flags, vm_offset_t *lastaddrp, int *segp) 730129198Scognet{ 731129198Scognet bus_size_t sgsize; 732129198Scognet bus_addr_t curaddr, lastaddr, baddr, bmask; 733129198Scognet vm_offset_t vaddr = (vm_offset_t)buf; 734129198Scognet int seg; 735129198Scognet int error = 0; 736129198Scognet pd_entry_t *pde; 737129198Scognet pt_entry_t pte; 738129198Scognet pt_entry_t *ptep; 739129198Scognet 740129198Scognet lastaddr = *lastaddrp; 741129198Scognet bmask = ~(dmat->boundary - 1); 742129198Scognet 743166063Scognet if ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) { 744173988Sjhb error = _bus_dmamap_count_pages(dmat, map, buf, buflen, flags); 745166063Scognet if (error) 746166063Scognet return (error); 747166063Scognet } 748140313Scognet CTR3(KTR_BUSDMA, "lowaddr= %d boundary= %d, " 749140313Scognet "alignment= %d", dmat->lowaddr, dmat->boundary, dmat->alignment); 750140313Scognet 751129198Scognet for (seg = *segp; buflen > 0 ; ) { 752129198Scognet /* 753129198Scognet * Get the physical address for this segment. 754129198Scognet * 755129198Scognet * XXX Don't support checking for coherent mappings 756129198Scognet * XXX in user address space. 757129198Scognet */ 758147591Scognet if (__predict_true(pmap == pmap_kernel())) { 759177103Sraj if (pmap_get_pde_pte(pmap, vaddr, &pde, &ptep) == FALSE) 760177103Sraj return (EFAULT); 761177103Sraj 762129198Scognet if (__predict_false(pmap_pde_section(pde))) { 763171623Scognet if (*pde & L1_S_SUPERSEC) 764171623Scognet curaddr = (*pde & L1_SUP_FRAME) | 765171623Scognet (vaddr & L1_SUP_OFFSET); 766171623Scognet else 767171623Scognet curaddr = (*pde & L1_S_FRAME) | 768171623Scognet (vaddr & L1_S_OFFSET); 769129198Scognet if (*pde & L1_S_CACHE_MASK) { 770129198Scognet map->flags &= 771135644Scognet ~DMAMAP_COHERENT; 772129198Scognet } 773129198Scognet } else { 774129198Scognet pte = *ptep; 775129198Scognet KASSERT((pte & L2_TYPE_MASK) != L2_TYPE_INV, 776132514Scognet ("INV type")); 777129198Scognet if (__predict_false((pte & L2_TYPE_MASK) 778129198Scognet == L2_TYPE_L)) { 779129198Scognet curaddr = (pte & L2_L_FRAME) | 780129198Scognet (vaddr & L2_L_OFFSET); 781129198Scognet if (pte & L2_L_CACHE_MASK) { 782129198Scognet map->flags &= 783135644Scognet ~DMAMAP_COHERENT; 784135644Scognet 785129198Scognet } 786129198Scognet } else { 787129198Scognet curaddr = (pte & L2_S_FRAME) | 788129198Scognet (vaddr & L2_S_OFFSET); 789129198Scognet if (pte & L2_S_CACHE_MASK) { 790129198Scognet map->flags &= 791135644Scognet ~DMAMAP_COHERENT; 792129198Scognet } 793129198Scognet } 794129198Scognet } 795129198Scognet } else { 796129198Scognet curaddr = pmap_extract(pmap, vaddr); 797135644Scognet map->flags &= ~DMAMAP_COHERENT; 798129198Scognet } 799129198Scognet 800129198Scognet /* 801129198Scognet * Compute the segment size, and adjust counts. 802129198Scognet */ 803129198Scognet sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK); 804170086Syongari if (sgsize > dmat->maxsegsz) 805170086Syongari sgsize = dmat->maxsegsz; 806129198Scognet if (buflen < sgsize) 807129198Scognet sgsize = buflen; 808129198Scognet 809129198Scognet /* 810129198Scognet * Make sure we don't cross any boundaries. 811129198Scognet */ 812129198Scognet if (dmat->boundary > 0) { 813129198Scognet baddr = (curaddr + dmat->boundary) & bmask; 814129198Scognet if (sgsize > (baddr - curaddr)) 815129198Scognet sgsize = (baddr - curaddr); 816129198Scognet } 817166063Scognet if (((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0) && 818166063Scognet map->pagesneeded != 0 && run_filter(dmat, curaddr)) 819166063Scognet curaddr = add_bounce_page(dmat, map, vaddr, sgsize); 820129198Scognet 821166063Scognet if (dmat->ranges) { 822166063Scognet struct arm32_dma_range *dr; 823166063Scognet 824166063Scognet dr = _bus_dma_inrange(dmat->ranges, dmat->_nranges, 825166063Scognet curaddr); 826166063Scognet if (dr == NULL) 827166063Scognet return (EINVAL); 828166063Scognet /* 829166063Scognet * In a valid DMA range. Translate the physical 830166063Scognet * memory address to an address in the DMA window. 831166063Scognet */ 832166063Scognet curaddr = (curaddr - dr->dr_sysbase) + dr->dr_busbase; 833166063Scognet 834166063Scognet } 835166063Scognet 836129198Scognet /* 837129198Scognet * Insert chunk into a segment, coalescing with 838129198Scognet * the previous segment if possible. 839129198Scognet */ 840173988Sjhb if (seg >= 0 && curaddr == lastaddr && 841137760Scognet (segs[seg].ds_len + sgsize) <= dmat->maxsegsz && 842137760Scognet (dmat->boundary == 0 || 843137760Scognet (segs[seg].ds_addr & bmask) == 844137760Scognet (curaddr & bmask))) { 845137760Scognet segs[seg].ds_len += sgsize; 846140349Scognet goto segdone; 847137760Scognet } else { 848137760Scognet if (++seg >= dmat->nsegments) 849137760Scognet break; 850129198Scognet segs[seg].ds_addr = curaddr; 851129198Scognet segs[seg].ds_len = sgsize; 852129198Scognet } 853135644Scognet if (error) 854135644Scognet break; 855135644Scognetsegdone: 856129198Scognet lastaddr = curaddr + sgsize; 857129198Scognet vaddr += sgsize; 858129198Scognet buflen -= sgsize; 859129198Scognet } 860129198Scognet 861129198Scognet *segp = seg; 862129198Scognet *lastaddrp = lastaddr; 863129198Scognet 864129198Scognet /* 865129198Scognet * Did we fit? 866129198Scognet */ 867129198Scognet if (buflen != 0) 868129198Scognet error = EFBIG; /* XXX better return value here? */ 869129198Scognet return (error); 870129198Scognet} 871129198Scognet 872129198Scognet/* 873140682Scognet * Map the buffer buf into bus space using the dmamap map. 874140682Scognet */ 875140682Scognetint 876140682Scognetbus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 877140682Scognet bus_size_t buflen, bus_dmamap_callback_t *callback, 878140682Scognet void *callback_arg, int flags) 879140682Scognet{ 880140682Scognet vm_offset_t lastaddr = 0; 881140682Scognet int error, nsegs = -1; 882143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 883140682Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 884140682Scognet#else 885140682Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 886140682Scognet#endif 887140682Scognet 888143671Sjmg KASSERT(dmat != NULL, ("dmatag is NULL")); 889143671Sjmg KASSERT(map != NULL, ("dmamap is NULL")); 890166063Scognet map->callback = callback; 891166063Scognet map->callback_arg = callback_arg; 892140682Scognet map->flags &= ~DMAMAP_TYPE_MASK; 893140682Scognet map->flags |= DMAMAP_LINEAR|DMAMAP_COHERENT; 894140682Scognet map->buffer = buf; 895140682Scognet map->len = buflen; 896140682Scognet error = bus_dmamap_load_buffer(dmat, 897140682Scognet dm_segments, map, buf, buflen, kernel_pmap, 898140682Scognet flags, &lastaddr, &nsegs); 899166063Scognet if (error == EINPROGRESS) 900166063Scognet return (error); 901140682Scognet if (error) 902140682Scognet (*callback)(callback_arg, NULL, 0, error); 903140682Scognet else 904140682Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, error); 905140682Scognet 906143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 907143284Smux __func__, dmat, dmat->flags, nsegs + 1, error); 908140682Scognet 909177103Sraj return (error); 910140682Scognet} 911140682Scognet 912140682Scognet/* 913129198Scognet * Like bus_dmamap_load(), but for mbufs. 914129198Scognet */ 915129198Scognetint 916129198Scognetbus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0, 917129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 918129198Scognet int flags) 919129198Scognet{ 920143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 921129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 922129198Scognet#else 923129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 924129198Scognet#endif 925137760Scognet int nsegs = -1, error = 0; 926129198Scognet 927129198Scognet M_ASSERTPKTHDR(m0); 928129198Scognet 929135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 930135644Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 931135644Scognet map->buffer = m0; 932146597Scognet map->len = 0; 933129198Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 934129198Scognet vm_offset_t lastaddr = 0; 935129198Scognet struct mbuf *m; 936129198Scognet 937129198Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 938146597Scognet if (m->m_len > 0) { 939129198Scognet error = bus_dmamap_load_buffer(dmat, 940137758Scognet dm_segments, map, m->m_data, m->m_len, 941137760Scognet pmap_kernel(), flags, &lastaddr, &nsegs); 942146597Scognet map->len += m->m_len; 943146597Scognet } 944129198Scognet } 945129198Scognet } else { 946129198Scognet error = EINVAL; 947129198Scognet } 948129198Scognet 949129198Scognet if (error) { 950129198Scognet /* 951129198Scognet * force "no valid mappings" on error in callback. 952129198Scognet */ 953129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 954129198Scognet } else { 955135644Scognet (*callback)(callback_arg, dm_segments, nsegs + 1, 956129198Scognet m0->m_pkthdr.len, error); 957129198Scognet } 958143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 959143284Smux __func__, dmat, dmat->flags, error, nsegs + 1); 960140313Scognet 961129198Scognet return (error); 962129198Scognet} 963129198Scognet 964140310Scognetint 965140310Scognetbus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 966140310Scognet struct mbuf *m0, bus_dma_segment_t *segs, int *nsegs, 967140310Scognet int flags) 968140310Scognet{ 969140310Scognet int error = 0; 970140310Scognet M_ASSERTPKTHDR(m0); 971140310Scognet 972140310Scognet flags |= BUS_DMA_NOWAIT; 973140310Scognet *nsegs = -1; 974140349Scognet map->flags &= ~DMAMAP_TYPE_MASK; 975140349Scognet map->flags |= DMAMAP_MBUF | DMAMAP_COHERENT; 976140349Scognet map->buffer = m0; 977146597Scognet map->len = 0; 978140310Scognet if (m0->m_pkthdr.len <= dmat->maxsize) { 979140310Scognet vm_offset_t lastaddr = 0; 980140310Scognet struct mbuf *m; 981140310Scognet 982140310Scognet for (m = m0; m != NULL && error == 0; m = m->m_next) { 983140310Scognet if (m->m_len > 0) { 984140310Scognet error = bus_dmamap_load_buffer(dmat, segs, map, 985140310Scognet m->m_data, m->m_len, 986140310Scognet pmap_kernel(), flags, &lastaddr, 987140310Scognet nsegs); 988146597Scognet map->len += m->m_len; 989140310Scognet } 990140310Scognet } 991140310Scognet } else { 992140310Scognet error = EINVAL; 993140310Scognet } 994140310Scognet 995140310Scognet /* XXX FIXME: Having to increment nsegs is really annoying */ 996140310Scognet ++*nsegs; 997143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 998143284Smux __func__, dmat, dmat->flags, error, *nsegs); 999140310Scognet return (error); 1000140310Scognet} 1001140310Scognet 1002129198Scognet/* 1003129198Scognet * Like bus_dmamap_load(), but for uios. 1004129198Scognet */ 1005129198Scognetint 1006129198Scognetbus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio, 1007129198Scognet bus_dmamap_callback2_t *callback, void *callback_arg, 1008129198Scognet int flags) 1009129198Scognet{ 1010169761Scognet vm_offset_t lastaddr = 0; 1011143063Sjoerg#ifdef __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1012129198Scognet bus_dma_segment_t dm_segments[dmat->nsegments]; 1013129198Scognet#else 1014129198Scognet bus_dma_segment_t dm_segments[BUS_DMAMAP_NSEGS]; 1015129198Scognet#endif 1016137760Scognet int nsegs, i, error; 1017129198Scognet bus_size_t resid; 1018129198Scognet struct iovec *iov; 1019137758Scognet struct pmap *pmap; 1020129198Scognet 1021129198Scognet resid = uio->uio_resid; 1022129198Scognet iov = uio->uio_iov; 1023135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 1024135644Scognet map->flags |= DMAMAP_UIO|DMAMAP_COHERENT; 1025135644Scognet map->buffer = uio; 1026146597Scognet map->len = 0; 1027129198Scognet 1028129198Scognet if (uio->uio_segflg == UIO_USERSPACE) { 1029138683Scognet KASSERT(uio->uio_td != NULL, 1030138683Scognet ("bus_dmamap_load_uio: USERSPACE but no proc")); 1031137758Scognet pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace); 1032137758Scognet } else 1033137758Scognet pmap = kernel_pmap; 1034129198Scognet 1035137760Scognet error = 0; 1036137760Scognet nsegs = -1; 1037129198Scognet for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) { 1038129198Scognet /* 1039129198Scognet * Now at the first iovec to load. Load each iovec 1040129198Scognet * until we have exhausted the residual count. 1041129198Scognet */ 1042129198Scognet bus_size_t minlen = 1043129198Scognet resid < iov[i].iov_len ? resid : iov[i].iov_len; 1044129198Scognet caddr_t addr = (caddr_t) iov[i].iov_base; 1045129198Scognet 1046129198Scognet if (minlen > 0) { 1047129198Scognet error = bus_dmamap_load_buffer(dmat, dm_segments, map, 1048137760Scognet addr, minlen, pmap, flags, &lastaddr, &nsegs); 1049129198Scognet 1050146597Scognet map->len += minlen; 1051129198Scognet resid -= minlen; 1052129198Scognet } 1053129198Scognet } 1054129198Scognet 1055129198Scognet if (error) { 1056129198Scognet /* 1057129198Scognet * force "no valid mappings" on error in callback. 1058129198Scognet */ 1059129198Scognet (*callback)(callback_arg, dm_segments, 0, 0, error); 1060129198Scognet } else { 1061129198Scognet (*callback)(callback_arg, dm_segments, nsegs+1, 1062129198Scognet uio->uio_resid, error); 1063129198Scognet } 1064129198Scognet 1065143294Smux CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d", 1066143284Smux __func__, dmat, dmat->flags, error, nsegs + 1); 1067129198Scognet return (error); 1068129198Scognet} 1069129198Scognet 1070129198Scognet/* 1071135644Scognet * Release the mapping held by map. 1072129198Scognet */ 1073129198Scognetvoid 1074143655Sjmg_bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map) 1075150893Scognet{ 1076166063Scognet struct bounce_page *bpage; 1077166063Scognet 1078135644Scognet map->flags &= ~DMAMAP_TYPE_MASK; 1079166063Scognet while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) { 1080166063Scognet STAILQ_REMOVE_HEAD(&map->bpages, links); 1081166063Scognet free_bounce_page(dmat, bpage); 1082166063Scognet } 1083129198Scognet return; 1084129198Scognet} 1085129198Scognet 1086169761Scognetstatic void 1087135644Scognetbus_dmamap_sync_buf(void *buf, int len, bus_dmasync_op_t op) 1088135644Scognet{ 1089166063Scognet char _tmp_cl[arm_dcache_align], _tmp_clend[arm_dcache_align]; 1090135644Scognet 1091171890Scognet if ((op & BUS_DMASYNC_PREWRITE) && !(op & BUS_DMASYNC_PREREAD)) { 1092135644Scognet cpu_dcache_wb_range((vm_offset_t)buf, len); 1093171623Scognet cpu_l2cache_wb_range((vm_offset_t)buf, len); 1094171623Scognet } 1095171623Scognet if (op & BUS_DMASYNC_PREREAD) { 1096174051Scognet if (!(op & BUS_DMASYNC_PREWRITE) && 1097171890Scognet ((((vm_offset_t)(buf) | len) & arm_dcache_align_mask) == 0)) { 1098171890Scognet cpu_dcache_inv_range((vm_offset_t)buf, len); 1099171890Scognet cpu_l2cache_inv_range((vm_offset_t)buf, len); 1100171890Scognet } else { 1101171890Scognet cpu_dcache_wbinv_range((vm_offset_t)buf, len); 1102171890Scognet cpu_l2cache_wbinv_range((vm_offset_t)buf, len); 1103171890Scognet } 1104171623Scognet } 1105166063Scognet if (op & BUS_DMASYNC_POSTREAD) { 1106171623Scognet if ((vm_offset_t)buf & arm_dcache_align_mask) { 1107166063Scognet memcpy(_tmp_cl, (void *)((vm_offset_t)buf & ~ 1108166063Scognet arm_dcache_align_mask), 1109171623Scognet (vm_offset_t)buf & arm_dcache_align_mask); 1110171623Scognet } 1111171623Scognet if (((vm_offset_t)buf + len) & arm_dcache_align_mask) { 1112171623Scognet memcpy(_tmp_clend, (void *)((vm_offset_t)buf + len), 1113171623Scognet arm_dcache_align - (((vm_offset_t)(buf) + len) & 1114171623Scognet arm_dcache_align_mask)); 1115171623Scognet } 1116166063Scognet cpu_dcache_inv_range((vm_offset_t)buf, len); 1117171623Scognet cpu_l2cache_inv_range((vm_offset_t)buf, len); 1118171623Scognet 1119166063Scognet if ((vm_offset_t)buf & arm_dcache_align_mask) 1120166063Scognet memcpy((void *)((vm_offset_t)buf & 1121171623Scognet ~arm_dcache_align_mask), _tmp_cl, 1122171623Scognet (vm_offset_t)buf & arm_dcache_align_mask); 1123166063Scognet if (((vm_offset_t)buf + len) & arm_dcache_align_mask) 1124171623Scognet memcpy((void *)((vm_offset_t)buf + len), _tmp_clend, 1125171623Scognet arm_dcache_align - (((vm_offset_t)(buf) + len) & 1126171623Scognet arm_dcache_align_mask)); 1127135644Scognet } 1128135644Scognet} 1129135644Scognet 1130166063Scognetstatic void 1131166063Scognet_bus_dmamap_sync_bp(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 1132166063Scognet{ 1133166063Scognet struct bounce_page *bpage; 1134166063Scognet 1135166063Scognet STAILQ_FOREACH(bpage, &map->bpages, links) { 1136166063Scognet if (op & BUS_DMASYNC_PREWRITE) { 1137166063Scognet bcopy((void *)bpage->datavaddr, 1138166063Scognet (void *)(bpage->vaddr_nocache != 0 ? 1139166063Scognet bpage->vaddr_nocache : bpage->vaddr), 1140166063Scognet bpage->datacount); 1141171623Scognet if (bpage->vaddr_nocache == 0) { 1142166063Scognet cpu_dcache_wb_range(bpage->vaddr, 1143166063Scognet bpage->datacount); 1144171623Scognet cpu_l2cache_wb_range(bpage->vaddr, 1145171623Scognet bpage->datacount); 1146171623Scognet } 1147166063Scognet } 1148166063Scognet if (op & BUS_DMASYNC_POSTREAD) { 1149171623Scognet if (bpage->vaddr_nocache == 0) { 1150166063Scognet cpu_dcache_inv_range(bpage->vaddr, 1151166063Scognet bpage->datacount); 1152171623Scognet cpu_l2cache_inv_range(bpage->vaddr, 1153171623Scognet bpage->datacount); 1154171623Scognet } 1155166063Scognet bcopy((void *)(bpage->vaddr_nocache != 0 ? 1156166063Scognet bpage->vaddr_nocache : bpage->vaddr), 1157166063Scognet (void *)bpage->datavaddr, bpage->datacount); 1158166063Scognet } 1159166063Scognet } 1160166063Scognet} 1161166063Scognet 1162166063Scognetstatic __inline int 1163166063Scognet_bus_dma_buf_is_in_bp(bus_dmamap_t map, void *buf, int len) 1164166063Scognet{ 1165166063Scognet struct bounce_page *bpage; 1166166063Scognet 1167166063Scognet STAILQ_FOREACH(bpage, &map->bpages, links) { 1168166063Scognet if ((vm_offset_t)buf >= bpage->datavaddr && 1169166063Scognet (vm_offset_t)buf + len < bpage->datavaddr + 1170166063Scognet bpage->datacount) 1171166063Scognet return (1); 1172166063Scognet } 1173166063Scognet return (0); 1174166063Scognet 1175166063Scognet} 1176166063Scognet 1177129198Scognetvoid 1178143655Sjmg_bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op) 1179129198Scognet{ 1180135644Scognet struct mbuf *m; 1181135644Scognet struct uio *uio; 1182135644Scognet int resid; 1183135644Scognet struct iovec *iov; 1184135644Scognet 1185159107Scognet if (op == BUS_DMASYNC_POSTWRITE) 1186129198Scognet return; 1187166063Scognet if (STAILQ_FIRST(&map->bpages)) 1188166063Scognet _bus_dmamap_sync_bp(dmat, map, op); 1189150893Scognet if (map->flags & DMAMAP_COHERENT) 1190129198Scognet return; 1191143294Smux CTR3(KTR_BUSDMA, "%s: op %x flags %x", __func__, op, map->flags); 1192135644Scognet switch(map->flags & DMAMAP_TYPE_MASK) { 1193135644Scognet case DMAMAP_LINEAR: 1194166063Scognet if (!(_bus_dma_buf_is_in_bp(map, map->buffer, map->len))) 1195166063Scognet bus_dmamap_sync_buf(map->buffer, map->len, op); 1196135644Scognet break; 1197135644Scognet case DMAMAP_MBUF: 1198135644Scognet m = map->buffer; 1199135644Scognet while (m) { 1200166063Scognet if (m->m_len > 0 && 1201166063Scognet !(_bus_dma_buf_is_in_bp(map, m->m_data, m->m_len))) 1202147591Scognet bus_dmamap_sync_buf(m->m_data, m->m_len, op); 1203135644Scognet m = m->m_next; 1204135644Scognet } 1205135644Scognet break; 1206135644Scognet case DMAMAP_UIO: 1207135644Scognet uio = map->buffer; 1208135644Scognet iov = uio->uio_iov; 1209135644Scognet resid = uio->uio_resid; 1210135644Scognet for (int i = 0; i < uio->uio_iovcnt && resid != 0; i++) { 1211135644Scognet bus_size_t minlen = resid < iov[i].iov_len ? resid : 1212135644Scognet iov[i].iov_len; 1213135644Scognet if (minlen > 0) { 1214166063Scognet if (!_bus_dma_buf_is_in_bp(map, iov[i].iov_base, 1215166063Scognet minlen)) 1216166063Scognet bus_dmamap_sync_buf(iov[i].iov_base, 1217166063Scognet minlen, op); 1218135644Scognet resid -= minlen; 1219135644Scognet } 1220135644Scognet } 1221135644Scognet break; 1222135644Scognet default: 1223135644Scognet break; 1224129198Scognet } 1225135644Scognet cpu_drain_writebuf(); 1226129198Scognet} 1227166063Scognet 1228166063Scognetstatic void 1229166063Scognetinit_bounce_pages(void *dummy __unused) 1230166063Scognet{ 1231166063Scognet 1232166063Scognet total_bpages = 0; 1233166063Scognet STAILQ_INIT(&bounce_zone_list); 1234166063Scognet STAILQ_INIT(&bounce_map_waitinglist); 1235166063Scognet STAILQ_INIT(&bounce_map_callbacklist); 1236166063Scognet mtx_init(&bounce_lock, "bounce pages lock", NULL, MTX_DEF); 1237166063Scognet} 1238166063ScognetSYSINIT(bpages, SI_SUB_LOCK, SI_ORDER_ANY, init_bounce_pages, NULL); 1239166063Scognet 1240166063Scognetstatic struct sysctl_ctx_list * 1241166063Scognetbusdma_sysctl_tree(struct bounce_zone *bz) 1242166063Scognet{ 1243166063Scognet return (&bz->sysctl_tree); 1244166063Scognet} 1245166063Scognet 1246166063Scognetstatic struct sysctl_oid * 1247166063Scognetbusdma_sysctl_tree_top(struct bounce_zone *bz) 1248166063Scognet{ 1249166063Scognet return (bz->sysctl_tree_top); 1250166063Scognet} 1251166063Scognet 1252166063Scognetstatic int 1253166063Scognetalloc_bounce_zone(bus_dma_tag_t dmat) 1254166063Scognet{ 1255166063Scognet struct bounce_zone *bz; 1256166063Scognet 1257166063Scognet /* Check to see if we already have a suitable zone */ 1258166063Scognet STAILQ_FOREACH(bz, &bounce_zone_list, links) { 1259166063Scognet if ((dmat->alignment <= bz->alignment) 1260166063Scognet && (dmat->boundary <= bz->boundary) 1261166063Scognet && (dmat->lowaddr >= bz->lowaddr)) { 1262166063Scognet dmat->bounce_zone = bz; 1263166063Scognet return (0); 1264166063Scognet } 1265166063Scognet } 1266166063Scognet 1267166063Scognet if ((bz = (struct bounce_zone *)malloc(sizeof(*bz), M_DEVBUF, 1268166063Scognet M_NOWAIT | M_ZERO)) == NULL) 1269166063Scognet return (ENOMEM); 1270166063Scognet 1271166063Scognet STAILQ_INIT(&bz->bounce_page_list); 1272166063Scognet bz->free_bpages = 0; 1273166063Scognet bz->reserved_bpages = 0; 1274166063Scognet bz->active_bpages = 0; 1275166063Scognet bz->lowaddr = dmat->lowaddr; 1276166063Scognet bz->alignment = dmat->alignment; 1277166063Scognet bz->boundary = dmat->boundary; 1278166063Scognet snprintf(bz->zoneid, 8, "zone%d", busdma_zonecount); 1279166063Scognet busdma_zonecount++; 1280166063Scognet snprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr); 1281166063Scognet STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links); 1282166063Scognet dmat->bounce_zone = bz; 1283166063Scognet 1284166063Scognet sysctl_ctx_init(&bz->sysctl_tree); 1285166063Scognet bz->sysctl_tree_top = SYSCTL_ADD_NODE(&bz->sysctl_tree, 1286166063Scognet SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid, 1287166063Scognet CTLFLAG_RD, 0, ""); 1288166063Scognet if (bz->sysctl_tree_top == NULL) { 1289166063Scognet sysctl_ctx_free(&bz->sysctl_tree); 1290166063Scognet return (0); /* XXX error code? */ 1291166063Scognet } 1292166063Scognet 1293166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1294166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1295166063Scognet "total_bpages", CTLFLAG_RD, &bz->total_bpages, 0, 1296166063Scognet "Total bounce pages"); 1297166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1298166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1299166063Scognet "free_bpages", CTLFLAG_RD, &bz->free_bpages, 0, 1300166063Scognet "Free bounce pages"); 1301166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1302166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1303166063Scognet "reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0, 1304166063Scognet "Reserved bounce pages"); 1305166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1306166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1307166063Scognet "active_bpages", CTLFLAG_RD, &bz->active_bpages, 0, 1308166063Scognet "Active bounce pages"); 1309166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1310166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1311166063Scognet "total_bounced", CTLFLAG_RD, &bz->total_bounced, 0, 1312166063Scognet "Total bounce requests"); 1313166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1314166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1315166063Scognet "total_deferred", CTLFLAG_RD, &bz->total_deferred, 0, 1316166063Scognet "Total bounce requests that were deferred"); 1317166063Scognet SYSCTL_ADD_STRING(busdma_sysctl_tree(bz), 1318166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1319166063Scognet "lowaddr", CTLFLAG_RD, bz->lowaddrid, 0, ""); 1320166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1321166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1322166063Scognet "alignment", CTLFLAG_RD, &bz->alignment, 0, ""); 1323166063Scognet SYSCTL_ADD_INT(busdma_sysctl_tree(bz), 1324166063Scognet SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, 1325166063Scognet "boundary", CTLFLAG_RD, &bz->boundary, 0, ""); 1326166063Scognet 1327166063Scognet return (0); 1328166063Scognet} 1329166063Scognet 1330166063Scognetstatic int 1331166063Scognetalloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages) 1332166063Scognet{ 1333166063Scognet struct bounce_zone *bz; 1334166063Scognet int count; 1335166063Scognet 1336166063Scognet bz = dmat->bounce_zone; 1337166063Scognet count = 0; 1338166063Scognet while (numpages > 0) { 1339166063Scognet struct bounce_page *bpage; 1340166063Scognet 1341166063Scognet bpage = (struct bounce_page *)malloc(sizeof(*bpage), M_DEVBUF, 1342166063Scognet M_NOWAIT | M_ZERO); 1343166063Scognet 1344166063Scognet if (bpage == NULL) 1345166063Scognet break; 1346166063Scognet bpage->vaddr = (vm_offset_t)contigmalloc(PAGE_SIZE, M_DEVBUF, 1347166063Scognet M_NOWAIT, 0ul, 1348166063Scognet bz->lowaddr, 1349166063Scognet PAGE_SIZE, 1350166063Scognet bz->boundary); 1351166063Scognet if (bpage->vaddr == 0) { 1352166063Scognet free(bpage, M_DEVBUF); 1353166063Scognet break; 1354166063Scognet } 1355166063Scognet bpage->busaddr = pmap_kextract(bpage->vaddr); 1356166063Scognet bpage->vaddr_nocache = (vm_offset_t)arm_remap_nocache( 1357166063Scognet (void *)bpage->vaddr, PAGE_SIZE); 1358166063Scognet mtx_lock(&bounce_lock); 1359166063Scognet STAILQ_INSERT_TAIL(&bz->bounce_page_list, bpage, links); 1360166063Scognet total_bpages++; 1361166063Scognet bz->total_bpages++; 1362166063Scognet bz->free_bpages++; 1363166063Scognet mtx_unlock(&bounce_lock); 1364166063Scognet count++; 1365166063Scognet numpages--; 1366166063Scognet } 1367166063Scognet return (count); 1368166063Scognet} 1369166063Scognet 1370166063Scognetstatic int 1371166063Scognetreserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map, int commit) 1372166063Scognet{ 1373166063Scognet struct bounce_zone *bz; 1374166063Scognet int pages; 1375166063Scognet 1376166063Scognet mtx_assert(&bounce_lock, MA_OWNED); 1377166063Scognet bz = dmat->bounce_zone; 1378166063Scognet pages = MIN(bz->free_bpages, map->pagesneeded - map->pagesreserved); 1379166063Scognet if (commit == 0 && map->pagesneeded > (map->pagesreserved + pages)) 1380166063Scognet return (map->pagesneeded - (map->pagesreserved + pages)); 1381166063Scognet bz->free_bpages -= pages; 1382166063Scognet bz->reserved_bpages += pages; 1383166063Scognet map->pagesreserved += pages; 1384166063Scognet pages = map->pagesneeded - map->pagesreserved; 1385166063Scognet 1386166063Scognet return (pages); 1387166063Scognet} 1388166063Scognet 1389166063Scognetstatic bus_addr_t 1390166063Scognetadd_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map, vm_offset_t vaddr, 1391166063Scognet bus_size_t size) 1392166063Scognet{ 1393166063Scognet struct bounce_zone *bz; 1394166063Scognet struct bounce_page *bpage; 1395166063Scognet 1396166063Scognet KASSERT(dmat->bounce_zone != NULL, ("no bounce zone in dma tag")); 1397170406Scognet KASSERT(map != NULL, ("add_bounce_page: bad map %p", map)); 1398166063Scognet 1399166063Scognet bz = dmat->bounce_zone; 1400166063Scognet if (map->pagesneeded == 0) 1401166063Scognet panic("add_bounce_page: map doesn't need any pages"); 1402166063Scognet map->pagesneeded--; 1403166063Scognet 1404166063Scognet if (map->pagesreserved == 0) 1405166063Scognet panic("add_bounce_page: map doesn't need any pages"); 1406166063Scognet map->pagesreserved--; 1407166063Scognet 1408166063Scognet mtx_lock(&bounce_lock); 1409166063Scognet bpage = STAILQ_FIRST(&bz->bounce_page_list); 1410166063Scognet if (bpage == NULL) 1411166063Scognet panic("add_bounce_page: free page list is empty"); 1412166063Scognet 1413166063Scognet STAILQ_REMOVE_HEAD(&bz->bounce_page_list, links); 1414166063Scognet bz->reserved_bpages--; 1415166063Scognet bz->active_bpages++; 1416166063Scognet mtx_unlock(&bounce_lock); 1417166063Scognet 1418166063Scognet bpage->datavaddr = vaddr; 1419166063Scognet bpage->datacount = size; 1420166063Scognet STAILQ_INSERT_TAIL(&(map->bpages), bpage, links); 1421166063Scognet return (bpage->busaddr); 1422166063Scognet} 1423166063Scognet 1424166063Scognetstatic void 1425166063Scognetfree_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage) 1426166063Scognet{ 1427166063Scognet struct bus_dmamap *map; 1428166063Scognet struct bounce_zone *bz; 1429166063Scognet 1430166063Scognet bz = dmat->bounce_zone; 1431166063Scognet bpage->datavaddr = 0; 1432166063Scognet bpage->datacount = 0; 1433166063Scognet 1434166063Scognet mtx_lock(&bounce_lock); 1435166063Scognet STAILQ_INSERT_HEAD(&bz->bounce_page_list, bpage, links); 1436166063Scognet bz->free_bpages++; 1437166063Scognet bz->active_bpages--; 1438166063Scognet if ((map = STAILQ_FIRST(&bounce_map_waitinglist)) != NULL) { 1439166063Scognet if (reserve_bounce_pages(map->dmat, map, 1) == 0) { 1440166063Scognet STAILQ_REMOVE_HEAD(&bounce_map_waitinglist, links); 1441166063Scognet STAILQ_INSERT_TAIL(&bounce_map_callbacklist, 1442166063Scognet map, links); 1443166063Scognet busdma_swi_pending = 1; 1444166063Scognet bz->total_deferred++; 1445166063Scognet swi_sched(vm_ih, 0); 1446166063Scognet } 1447166063Scognet } 1448166063Scognet mtx_unlock(&bounce_lock); 1449166063Scognet} 1450166063Scognet 1451166063Scognetvoid 1452166063Scognetbusdma_swi(void) 1453166063Scognet{ 1454166063Scognet bus_dma_tag_t dmat; 1455166063Scognet struct bus_dmamap *map; 1456166063Scognet 1457166063Scognet mtx_lock(&bounce_lock); 1458166063Scognet while ((map = STAILQ_FIRST(&bounce_map_callbacklist)) != NULL) { 1459166063Scognet STAILQ_REMOVE_HEAD(&bounce_map_callbacklist, links); 1460166063Scognet mtx_unlock(&bounce_lock); 1461166063Scognet dmat = map->dmat; 1462166063Scognet (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_LOCK); 1463166063Scognet bus_dmamap_load(map->dmat, map, map->buffer, map->len, 1464166063Scognet map->callback, map->callback_arg, /*flags*/0); 1465166063Scognet (dmat->lockfunc)(dmat->lockfuncarg, BUS_DMA_UNLOCK); 1466166063Scognet mtx_lock(&bounce_lock); 1467166063Scognet } 1468166063Scognet mtx_unlock(&bounce_lock); 1469166063Scognet} 1470