iommu.c revision 1.27
1 /* $NetBSD: iommu.c,v 1.27 1998/09/19 15:47:19 pk Exp $ */ 2 3 /* 4 * Copyright (c) 1996 5 * The President and Fellows of Harvard College. All rights reserved. 6 * Copyright (c) 1995 Paul Kranenburg 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Aaron Brown and 19 * Harvard University. 20 * This product includes software developed by Paul Kranenburg. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 */ 38 39 #include <sys/param.h> 40 #include <sys/extent.h> 41 #include <sys/malloc.h> 42 #include <sys/queue.h> 43 #include <sys/systm.h> 44 #include <sys/device.h> 45 #include <vm/vm.h> 46 #include <vm/vm_kern.h> 47 48 #if defined(UVM) 49 #include <uvm/uvm.h> 50 #else 51 #define uvm_km_valloc(m,s) kmem_alloc_pageable(m,s) 52 #define uvm_unmap(m,a,s,x) kmem_free(m,a,s) 53 #endif 54 55 #define _SPARC_BUS_DMA_PRIVATE 56 #include <machine/bus.h> 57 #include <machine/autoconf.h> 58 #include <machine/ctlreg.h> 59 #include <sparc/sparc/asm.h> 60 #include <sparc/sparc/vaddrs.h> 61 #include <sparc/sparc/cpuvar.h> 62 #include <sparc/sparc/iommureg.h> 63 #include <sparc/sparc/iommuvar.h> 64 65 struct iommu_softc { 66 struct device sc_dev; /* base device */ 67 struct iommureg *sc_reg; 68 u_int sc_pagesize; 69 u_int sc_range; 70 bus_addr_t sc_dvmabase; 71 iopte_t *sc_ptes; 72 int sc_hasiocache; 73 }; 74 struct iommu_softc *iommu_sc;/*XXX*/ 75 int has_iocache; 76 u_long dvma_cachealign; 77 78 struct extent *iommu_dvmamap; 79 80 81 /* autoconfiguration driver */ 82 int iommu_print __P((void *, const char *)); 83 void iommu_attach __P((struct device *, struct device *, void *)); 84 int iommu_match __P((struct device *, struct cfdata *, void *)); 85 86 struct cfattach iommu_ca = { 87 sizeof(struct iommu_softc), iommu_match, iommu_attach 88 }; 89 90 /* IOMMU DMA map functions */ 91 int iommu_dmamap_load __P((bus_dma_tag_t, bus_dmamap_t, void *, 92 bus_size_t, struct proc *, int)); 93 int iommu_dmamap_load_mbuf __P((bus_dma_tag_t, bus_dmamap_t, 94 struct mbuf *, int)); 95 int iommu_dmamap_load_uio __P((bus_dma_tag_t, bus_dmamap_t, 96 struct uio *, int)); 97 int iommu_dmamap_load_raw __P((bus_dma_tag_t, bus_dmamap_t, 98 bus_dma_segment_t *, int, bus_size_t, int)); 99 void iommu_dmamap_unload __P((bus_dma_tag_t, bus_dmamap_t)); 100 void iommu_dmamap_sync __P((bus_dma_tag_t, bus_dmamap_t, bus_addr_t, 101 bus_size_t, int)); 102 103 int iommu_dmamem_alloc __P((bus_dma_tag_t tag, bus_size_t size, 104 bus_size_t alignment, bus_size_t boundary, 105 bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags)); 106 void iommu_dmamem_free __P((bus_dma_tag_t tag, bus_dma_segment_t *segs, 107 int nsegs)); 108 int iommu_dmamem_map __P((bus_dma_tag_t tag, bus_dma_segment_t *segs, 109 int nsegs, size_t size, caddr_t *kvap, int flags)); 110 int iommu_dmamem_mmap __P((bus_dma_tag_t tag, bus_dma_segment_t *segs, 111 int nsegs, int off, int prot, int flags)); 112 113 114 struct sparc_bus_dma_tag iommu_dma_tag = { 115 NULL, 116 _bus_dmamap_create, 117 _bus_dmamap_destroy, 118 iommu_dmamap_load, 119 iommu_dmamap_load_mbuf, 120 iommu_dmamap_load_uio, 121 iommu_dmamap_load_raw, 122 iommu_dmamap_unload, 123 iommu_dmamap_sync, 124 125 iommu_dmamem_alloc, 126 iommu_dmamem_free, 127 iommu_dmamem_map, 128 _bus_dmamem_unmap, 129 iommu_dmamem_mmap 130 }; 131 /* 132 * Print the location of some iommu-attached device (called just 133 * before attaching that device). If `iommu' is not NULL, the 134 * device was found but not configured; print the iommu as well. 135 * Return UNCONF (config_find ignores this if the device was configured). 136 */ 137 int 138 iommu_print(args, iommu) 139 void *args; 140 const char *iommu; 141 { 142 struct iommu_attach_args *ia = args; 143 144 if (iommu) 145 printf("%s at %s", ia->iom_name, iommu); 146 return (UNCONF); 147 } 148 149 int 150 iommu_match(parent, cf, aux) 151 struct device *parent; 152 struct cfdata *cf; 153 void *aux; 154 { 155 struct mainbus_attach_args *ma = aux; 156 157 if (CPU_ISSUN4OR4C) 158 return (0); 159 return (strcmp(cf->cf_driver->cd_name, ma->ma_name) == 0); 160 } 161 162 /* 163 * Attach the iommu. 164 */ 165 void 166 iommu_attach(parent, self, aux) 167 struct device *parent; 168 struct device *self; 169 void *aux; 170 { 171 #if defined(SUN4M) 172 struct iommu_softc *sc = (struct iommu_softc *)self; 173 struct mainbus_attach_args *ma = aux; 174 int node; 175 struct bootpath *bp; 176 bus_space_handle_t bh; 177 u_int pbase, pa; 178 int i, mmupcrsave, s; 179 iopte_t *tpte_p; 180 extern u_int *kernel_iopte_table; 181 extern u_int kernel_iopte_table_pa; 182 183 /*XXX-GCC!*/mmupcrsave=0; 184 iommu_sc = sc; 185 /* 186 * XXX there is only one iommu, for now -- do not know how to 187 * address children on others 188 */ 189 if (sc->sc_dev.dv_unit > 0) { 190 printf(" unsupported\n"); 191 return; 192 } 193 node = ma->ma_node; 194 195 #if 0 196 if (ra->ra_vaddr) 197 sc->sc_reg = (struct iommureg *)ca->ca_ra.ra_vaddr; 198 #else 199 /* 200 * Map registers into our space. The PROM may have done this 201 * already, but I feel better if we have our own copy. Plus, the 202 * prom doesn't map the entire register set 203 * 204 * XXX struct iommureg is bigger than ra->ra_len; what are the 205 * other fields for? 206 */ 207 if (bus_space_map2( 208 ma->ma_bustag, 209 ma->ma_iospace, 210 ma->ma_paddr, 211 sizeof(struct iommureg), 212 0, 213 0, 214 &bh) != 0) { 215 printf("iommu_attach: cannot map registers\n"); 216 return; 217 } 218 sc->sc_reg = (struct iommureg *)bh; 219 #endif 220 221 sc->sc_hasiocache = node_has_property(node, "cache-coherence?"); 222 if (CACHEINFO.c_enabled == 0) /* XXX - is this correct? */ 223 sc->sc_hasiocache = 0; 224 has_iocache = sc->sc_hasiocache; /* Set global flag */ 225 226 sc->sc_pagesize = getpropint(node, "page-size", NBPG), 227 sc->sc_range = (1 << 24) << 228 ((sc->sc_reg->io_cr & IOMMU_CTL_RANGE) >> IOMMU_CTL_RANGESHFT); 229 #if 0 230 sc->sc_dvmabase = (0 - sc->sc_range); 231 #endif 232 pbase = (sc->sc_reg->io_bar & IOMMU_BAR_IBA) << 233 (14 - IOMMU_BAR_IBASHFT); 234 235 /* 236 * Now we build our own copy of the IOMMU page tables. We need to 237 * do this since we're going to change the range to give us 64M of 238 * mappings, and thus we can move DVMA space down to 0xfd000000 to 239 * give us lots of space and to avoid bumping into the PROM, etc. 240 * 241 * XXX Note that this is rather messy. 242 */ 243 sc->sc_ptes = (iopte_t *) kernel_iopte_table; 244 245 /* 246 * Now discache the page tables so that the IOMMU sees our 247 * changes. 248 */ 249 kvm_uncache((caddr_t)sc->sc_ptes, 250 (((0 - IOMMU_DVMA_BASE)/sc->sc_pagesize) * sizeof(iopte_t)) / NBPG); 251 252 /* 253 * Ok. We've got to read in the original table using MMU bypass, 254 * and copy all of its entries to the appropriate place in our 255 * new table, even if the sizes are different. 256 * This is pretty easy since we know DVMA ends at 0xffffffff. 257 * 258 * XXX: PGOFSET, NBPG assume same page size as SRMMU 259 */ 260 if (cpuinfo.cpu_impl == 4 && cpuinfo.mxcc) { 261 /* set MMU AC bit */ 262 sta(SRMMU_PCR, ASI_SRMMU, 263 ((mmupcrsave = lda(SRMMU_PCR, ASI_SRMMU)) | VIKING_PCR_AC)); 264 } 265 266 for (tpte_p = &sc->sc_ptes[((0 - IOMMU_DVMA_BASE)/NBPG) - 1], 267 pa = (u_int)pbase - sizeof(iopte_t) + 268 ((u_int)sc->sc_range/NBPG)*sizeof(iopte_t); 269 tpte_p >= &sc->sc_ptes[0] && pa >= (u_int)pbase; 270 tpte_p--, pa -= sizeof(iopte_t)) { 271 272 IOMMU_FLUSHPAGE(sc, 273 (tpte_p - &sc->sc_ptes[0])*NBPG + IOMMU_DVMA_BASE); 274 *tpte_p = lda(pa, ASI_BYPASS); 275 } 276 if (cpuinfo.cpu_impl == 4 && cpuinfo.mxcc) { 277 /* restore mmu after bug-avoidance */ 278 sta(SRMMU_PCR, ASI_SRMMU, mmupcrsave); 279 } 280 281 /* 282 * Now we can install our new pagetable into the IOMMU 283 */ 284 sc->sc_range = 0 - IOMMU_DVMA_BASE; 285 sc->sc_dvmabase = IOMMU_DVMA_BASE; 286 287 /* calculate log2(sc->sc_range/16MB) */ 288 i = ffs(sc->sc_range/(1 << 24)) - 1; 289 if ((1 << i) != (sc->sc_range/(1 << 24))) 290 panic("bad iommu range: %d\n",i); 291 292 s = splhigh(); 293 IOMMU_FLUSHALL(sc); 294 295 sc->sc_reg->io_cr = (sc->sc_reg->io_cr & ~IOMMU_CTL_RANGE) | 296 (i << IOMMU_CTL_RANGESHFT) | IOMMU_CTL_ME; 297 sc->sc_reg->io_bar = (kernel_iopte_table_pa >> 4) & IOMMU_BAR_IBA; 298 299 IOMMU_FLUSHALL(sc); 300 splx(s); 301 302 printf(": version 0x%x/0x%x, page-size %d, range %dMB\n", 303 (sc->sc_reg->io_cr & IOMMU_CTL_VER) >> 24, 304 (sc->sc_reg->io_cr & IOMMU_CTL_IMPL) >> 28, 305 sc->sc_pagesize, 306 sc->sc_range >> 20); 307 308 /* Propagate bootpath */ 309 if (ma->ma_bp != NULL && strcmp(ma->ma_bp->name, "iommu") == 0) 310 bp = ma->ma_bp + 1; 311 else 312 bp = NULL; 313 314 iommu_dvmamap = extent_create("iommudvma", 315 IOMMU_DVMA_BASE, IOMMU_DVMA_END, 316 M_DEVBUF, 0, 0, EX_NOWAIT); 317 if (iommu_dvmamap == NULL) 318 panic("iommu: unable to allocate DVMA map"); 319 320 /* 321 * Loop through ROM children (expect Sbus among them). 322 */ 323 for (node = firstchild(node); node; node = nextsibling(node)) { 324 struct iommu_attach_args ia; 325 326 bzero(&ia, sizeof ia); 327 ia.iom_name = getpropstring(node, "name"); 328 329 /* Propagate BUS & DMA tags */ 330 ia.iom_bustag = ma->ma_bustag; 331 ia.iom_dmatag = &iommu_dma_tag; 332 333 ia.iom_node = node; 334 ia.iom_bp = bp; 335 336 ia.iom_reg = NULL; 337 getprop(node, "reg", sizeof(struct sbus_reg), 338 &ia.iom_nreg, (void **)&ia.iom_reg); 339 340 (void) config_found(&sc->sc_dev, (void *)&ia, iommu_print); 341 if (ia.iom_reg != NULL) 342 free(ia.iom_reg, M_DEVBUF); 343 } 344 #endif 345 } 346 347 void 348 iommu_enter(va, pa) 349 bus_addr_t va; 350 paddr_t pa; 351 { 352 struct iommu_softc *sc = iommu_sc; 353 int pte; 354 355 #ifdef DEBUG 356 if (va < sc->sc_dvmabase) 357 panic("iommu_enter: va 0x%lx not in DVMA space", (long)va); 358 #endif 359 360 pte = atop(pa) << IOPTE_PPNSHFT; 361 pte &= IOPTE_PPN; 362 pte |= IOPTE_V | IOPTE_W | (has_iocache ? IOPTE_C : 0); 363 sc->sc_ptes[atop(va - sc->sc_dvmabase)] = pte; 364 IOMMU_FLUSHPAGE(sc, va); 365 } 366 367 /* 368 * iommu_clear: clears mappings created by iommu_enter 369 */ 370 void 371 iommu_remove(va, len) 372 bus_addr_t va; 373 bus_size_t len; 374 { 375 struct iommu_softc *sc = iommu_sc; 376 u_int pagesz = sc->sc_pagesize; 377 bus_addr_t base = sc->sc_dvmabase; 378 379 #ifdef DEBUG 380 if (va < base) 381 panic("iommu_enter: va 0x%lx not in DVMA space", (long)va); 382 #endif 383 384 while ((long)len > 0) { 385 #ifdef notyet 386 #ifdef DEBUG 387 if ((sc->sc_ptes[atop(va - base)] & IOPTE_V) == 0) 388 panic("iommu_clear: clearing invalid pte at va 0x%lx", 389 (long)va); 390 #endif 391 #endif 392 sc->sc_ptes[atop(va - base)] = 0; 393 IOMMU_FLUSHPAGE(sc, va); 394 len -= pagesz; 395 va += pagesz; 396 } 397 } 398 399 #if 0 /* These registers aren't there??? */ 400 void 401 iommu_error() 402 { 403 struct iommu_softc *sc = X; 404 struct iommureg *iop = sc->sc_reg; 405 406 printf("iommu: afsr 0x%x, afar 0x%x\n", iop->io_afsr, iop->io_afar); 407 printf("iommu: mfsr 0x%x, mfar 0x%x\n", iop->io_mfsr, iop->io_mfar); 408 } 409 int 410 iommu_alloc(va, len) 411 u_int va, len; 412 { 413 struct iommu_softc *sc = X; 414 int off, tva, pa, iovaddr, pte; 415 416 off = (int)va & PGOFSET; 417 len = round_page(len + off); 418 va -= off; 419 420 if ((int)sc->sc_dvmacur + len > 0) 421 sc->sc_dvmacur = sc->sc_dvmabase; 422 423 iovaddr = tva = sc->sc_dvmacur; 424 sc->sc_dvmacur += len; 425 while (len) { 426 pa = pmap_extract(pmap_kernel(), va); 427 428 #define IOMMU_PPNSHIFT 8 429 #define IOMMU_V 0x00000002 430 #define IOMMU_W 0x00000004 431 432 pte = atop(pa) << IOMMU_PPNSHIFT; 433 pte |= IOMMU_V | IOMMU_W; 434 sta(sc->sc_ptes + atop(tva - sc->sc_dvmabase), ASI_BYPASS, pte); 435 sc->sc_reg->io_flushpage = tva; 436 len -= NBPG; 437 va += NBPG; 438 tva += NBPG; 439 } 440 return iovaddr + off; 441 } 442 #endif 443 444 445 /* 446 * IOMMU DMA map functions. 447 */ 448 int 449 iommu_dmamap_load(t, map, buf, buflen, p, flags) 450 bus_dma_tag_t t; 451 bus_dmamap_t map; 452 void *buf; 453 bus_size_t buflen; 454 struct proc *p; 455 int flags; 456 { 457 bus_size_t sgsize; 458 bus_addr_t dva; 459 bus_addr_t boundary; 460 vaddr_t va = (vaddr_t)buf; 461 u_long align, voff; 462 pmap_t pmap; 463 464 /* 465 * Remember page offset, then truncate the buffer address to 466 * a page boundary. 467 */ 468 voff = va & PGOFSET; 469 va &= ~PGOFSET; 470 471 /* 472 * Make sure that on error condition we return "no valid mappings". 473 */ 474 map->dm_nsegs = 0; 475 476 if (buflen > map->_dm_size) 477 return (EINVAL); 478 479 sgsize = (buflen + voff + PGOFSET) & ~PGOFSET; 480 align = dvma_cachealign ? dvma_cachealign : NBPG; 481 boundary = map->_dm_boundary; 482 483 if (extent_alloc1(iommu_dvmamap, sgsize, align, va & (align-1), 484 boundary, EX_NOWAIT, (u_long *)&dva) != 0) 485 return (ENOMEM); 486 487 cpuinfo.cache_flush(buf, buflen); 488 489 /* 490 * We always use just one segment. 491 */ 492 map->dm_mapsize = buflen; 493 map->dm_nsegs = 1; 494 map->dm_segs[0].ds_addr = dva + voff; 495 map->dm_segs[0].ds_len = buflen; 496 497 if (p != NULL) 498 pmap = p->p_vmspace->vm_map.pmap; 499 else 500 pmap = pmap_kernel(); 501 502 for (; sgsize != 0; ) { 503 /* 504 * Get the physical address for this page. 505 */ 506 paddr_t pa = pmap_extract(pmap, va); 507 508 iommu_enter(dva, pa); 509 510 dva += NBPG; 511 va += NBPG; 512 sgsize -= NBPG; 513 } 514 515 return (0); 516 } 517 518 /* 519 * Like _bus_dmamap_load(), but for mbufs. 520 */ 521 int 522 iommu_dmamap_load_mbuf(t, map, m, flags) 523 bus_dma_tag_t t; 524 bus_dmamap_t map; 525 struct mbuf *m; 526 int flags; 527 { 528 529 panic("_bus_dmamap_load: not implemented"); 530 } 531 532 /* 533 * Like _bus_dmamap_load(), but for uios. 534 */ 535 int 536 iommu_dmamap_load_uio(t, map, uio, flags) 537 bus_dma_tag_t t; 538 bus_dmamap_t map; 539 struct uio *uio; 540 int flags; 541 { 542 543 panic("_bus_dmamap_load_uio: not implemented"); 544 } 545 546 /* 547 * Like _bus_dmamap_load(), but for raw memory allocated with 548 * bus_dmamem_alloc(). 549 */ 550 int 551 iommu_dmamap_load_raw(t, map, segs, nsegs, size, flags) 552 bus_dma_tag_t t; 553 bus_dmamap_t map; 554 bus_dma_segment_t *segs; 555 int nsegs; 556 bus_size_t size; 557 int flags; 558 { 559 560 panic("_bus_dmamap_load_raw: not implemented"); 561 } 562 563 /* 564 * Common function for unloading a DMA map. May be called by 565 * bus-specific DMA map unload functions. 566 */ 567 void 568 iommu_dmamap_unload(t, map) 569 bus_dma_tag_t t; 570 bus_dmamap_t map; 571 { 572 bus_addr_t addr; 573 bus_size_t len; 574 575 if (map->dm_nsegs != 1) 576 panic("_bus_dmamap_unload: nsegs = %d", map->dm_nsegs); 577 578 addr = map->dm_segs[0].ds_addr & ~PGOFSET; 579 len = map->dm_segs[0].ds_len; 580 len = ((addr & PGOFSET) + len + PGOFSET) & ~PGOFSET; 581 addr &= ~PGOFSET; 582 583 iommu_remove(addr, len); 584 if (extent_free(iommu_dvmamap, addr, len, EX_NOWAIT) != 0) 585 printf("warning: %ld of DVMA space lost\n", (long)len); 586 587 /* Mark the mappings as invalid. */ 588 map->dm_mapsize = 0; 589 map->dm_nsegs = 0; 590 } 591 592 /* 593 * Common function for DMA map synchronization. May be called 594 * by bus-specific DMA map synchronization functions. 595 */ 596 void 597 iommu_dmamap_sync(t, map, offset, len, ops) 598 bus_dma_tag_t t; 599 bus_dmamap_t map; 600 bus_addr_t offset; 601 bus_size_t len; 602 int ops; 603 { 604 605 /* 606 * XXX Should flush CPU write buffers. 607 */ 608 } 609 610 /* 611 * Common function for DMA-safe memory allocation. May be called 612 * by bus-specific DMA memory allocation functions. 613 */ 614 int 615 iommu_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags) 616 bus_dma_tag_t t; 617 bus_size_t size, alignment, boundary; 618 bus_dma_segment_t *segs; 619 int nsegs; 620 int *rsegs; 621 int flags; 622 { 623 paddr_t pa; 624 bus_addr_t dva; 625 vm_page_t m; 626 int error; 627 struct pglist *mlist; 628 629 size = round_page(size); 630 error = _bus_dmamem_alloc_common(t, size, alignment, boundary, 631 segs, nsegs, rsegs, flags); 632 if (error != 0) 633 return (error); 634 635 if (extent_alloc(iommu_dvmamap, size, alignment, boundary, 636 (flags & BUS_DMA_NOWAIT) == 0 ? EX_WAITOK : EX_NOWAIT, 637 (u_long *)&dva) != 0) 638 return (ENOMEM); 639 640 /* 641 * Compute the location, size, and number of segments actually 642 * returned by the VM code. 643 */ 644 segs[0].ds_addr = dva; 645 segs[0].ds_len = size; 646 *rsegs = 1; 647 648 mlist = segs[0]._ds_mlist; 649 /* Map memory into DVMA space */ 650 for (m = TAILQ_FIRST(mlist); m != NULL; m = TAILQ_NEXT(m,pageq)) { 651 pa = VM_PAGE_TO_PHYS(m); 652 653 iommu_enter(dva, pa); 654 dva += PAGE_SIZE; 655 } 656 657 return (0); 658 } 659 660 /* 661 * Common function for freeing DMA-safe memory. May be called by 662 * bus-specific DMA memory free functions. 663 */ 664 void 665 iommu_dmamem_free(t, segs, nsegs) 666 bus_dma_tag_t t; 667 bus_dma_segment_t *segs; 668 int nsegs; 669 { 670 bus_addr_t addr; 671 bus_size_t len; 672 673 if (nsegs != 1) 674 panic("bus_dmamem_free: nsegs = %d", nsegs); 675 676 addr = segs[0].ds_addr; 677 len = segs[0].ds_len; 678 679 iommu_remove(addr, len); 680 if (extent_free(iommu_dvmamap, addr, len, EX_NOWAIT) != 0) 681 printf("warning: %ld of DVMA space lost\n", (long)len); 682 /* 683 * Return the list of pages back to the VM system. 684 */ 685 _bus_dmamem_free_common(t, segs, nsegs); 686 } 687 688 /* 689 * Common function for mapping DMA-safe memory. May be called by 690 * bus-specific DMA memory map functions. 691 */ 692 int 693 iommu_dmamem_map(t, segs, nsegs, size, kvap, flags) 694 bus_dma_tag_t t; 695 bus_dma_segment_t *segs; 696 int nsegs; 697 size_t size; 698 caddr_t *kvap; 699 int flags; 700 { 701 vm_page_t m; 702 vaddr_t va, sva; 703 bus_addr_t addr; 704 struct pglist *mlist; 705 int cbit; 706 size_t oversize; 707 u_long align; 708 709 if (nsegs != 1) 710 panic("iommu_dmamem_map: nsegs = %d", nsegs); 711 712 cbit = has_iocache ? 0 : PMAP_NC; 713 align = dvma_cachealign ? dvma_cachealign : PAGE_SIZE; 714 715 size = round_page(size); 716 717 /* 718 * Find a region of kernel virtual addresses that can accomodate 719 * our aligment requirements. 720 */ 721 oversize = size + align - PAGE_SIZE; 722 sva = uvm_km_valloc(kernel_map, oversize); 723 if (sva == 0) 724 return (ENOMEM); 725 726 /* Compute start of aligned region */ 727 va = sva; 728 va += ((segs[0].ds_addr & (align - 1)) + align - va) & (align - 1); 729 730 /* Return excess virtual addresses */ 731 if (va != sva) 732 (void)uvm_unmap(kernel_map, sva, va, 0); 733 if (va + size != sva + oversize) 734 (void)uvm_unmap(kernel_map, va + size, sva + oversize, 0); 735 736 737 *kvap = (caddr_t)va; 738 mlist = segs[0]._ds_mlist; 739 740 for (m = TAILQ_FIRST(mlist); m != NULL; m = TAILQ_NEXT(m,pageq)) { 741 742 if (size == 0) 743 panic("iommu_dmamem_map: size botch"); 744 745 addr = VM_PAGE_TO_PHYS(m); 746 pmap_enter(pmap_kernel(), va, addr | cbit, 747 VM_PROT_READ | VM_PROT_WRITE, TRUE); 748 #if 0 749 if (flags & BUS_DMA_COHERENT) 750 /* XXX */; 751 #endif 752 va += PAGE_SIZE; 753 size -= PAGE_SIZE; 754 } 755 756 return (0); 757 } 758 759 /* 760 * Common functin for mmap(2)'ing DMA-safe memory. May be called by 761 * bus-specific DMA mmap(2)'ing functions. 762 */ 763 int 764 iommu_dmamem_mmap(t, segs, nsegs, off, prot, flags) 765 bus_dma_tag_t t; 766 bus_dma_segment_t *segs; 767 int nsegs, off, prot, flags; 768 { 769 770 panic("_bus_dmamem_mmap: not implemented"); 771 } 772
Indexes created Tue Sep 30 20:09:53 GMT 2025