1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2018-2019 Ruslan Bukin <br@bsdpad.com> 5 * 6 * This software was developed by SRI International and the University of 7 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 8 * ("CTSRD"), as part of the DARPA CRASH research programme. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_platform.h" 36 #include <sys/param.h> 37 #include <sys/conf.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/mutex.h> 44 #include <sys/rwlock.h> 45 46 #include <machine/bus.h> 47 48 #include <vm/vm.h> 49 #include <vm/pmap.h> 50 #include <vm/vm_extern.h> 51 #include <vm/vm_page.h> 52 53 #ifdef FDT 54 #include <dev/fdt/fdt_common.h> 55 #include <dev/ofw/ofw_bus.h> 56 #include <dev/ofw/ofw_bus_subr.h> 57 #endif 58 59 #include <dev/xdma/xdma.h> 60 61 #include <xdma_if.h> 62 63 struct seg_load_request { 64 struct bus_dma_segment *seg; 65 uint32_t nsegs; 66 uint32_t error; 67 }; 68 69 static void 70 xchan_bufs_free_reserved(xdma_channel_t *xchan) 71 { 72 struct xdma_request *xr; 73 vm_size_t size; 74 int i; 75 76 for (i = 0; i < xchan->xr_num; i++) { 77 xr = &xchan->xr_mem[i]; 78 size = xr->buf.size; 79 if (xr->buf.vaddr) { 80 pmap_kremove_device(xr->buf.vaddr, size); 81 kva_free(xr->buf.vaddr, size); 82 xr->buf.vaddr = 0; 83 } 84 if (xr->buf.paddr) { 85 vmem_free(xchan->vmem, xr->buf.paddr, size); 86 xr->buf.paddr = 0; 87 } 88 xr->buf.size = 0; 89 } 90 } 91 92 static int 93 xchan_bufs_alloc_reserved(xdma_channel_t *xchan) 94 { 95 xdma_controller_t *xdma; 96 struct xdma_request *xr; 97 vmem_addr_t addr; 98 vm_size_t size; 99 int i; 100 101 xdma = xchan->xdma; 102 103 if (xchan->vmem == NULL) 104 return (ENOBUFS); 105 106 for (i = 0; i < xchan->xr_num; i++) { 107 xr = &xchan->xr_mem[i]; 108 size = round_page(xchan->maxsegsize); 109 if (vmem_alloc(xchan->vmem, size, 110 M_BESTFIT | M_NOWAIT, &addr)) { 111 device_printf(xdma->dev, 112 "%s: Can't allocate memory\n", __func__); 113 xchan_bufs_free_reserved(xchan); 114 return (ENOMEM); 115 } 116 117 xr->buf.size = size; 118 xr->buf.paddr = addr; 119 xr->buf.vaddr = kva_alloc(size); 120 if (xr->buf.vaddr == 0) { 121 device_printf(xdma->dev, 122 "%s: Can't allocate KVA\n", __func__); 123 xchan_bufs_free_reserved(xchan); 124 return (ENOMEM); 125 } 126 pmap_kenter_device(xr->buf.vaddr, size, addr); 127 } 128 129 return (0); 130 } 131 132 static int 133 xchan_bufs_alloc_busdma(xdma_channel_t *xchan) 134 { 135 xdma_controller_t *xdma; 136 struct xdma_request *xr; 137 int err; 138 int i; 139 140 xdma = xchan->xdma; 141 142 /* Create bus_dma tag */ 143 err = bus_dma_tag_create( 144 bus_get_dma_tag(xdma->dev), /* Parent tag. */ 145 xchan->alignment, /* alignment */ 146 xchan->boundary, /* boundary */ 147 xchan->lowaddr, /* lowaddr */ 148 xchan->highaddr, /* highaddr */ 149 NULL, NULL, /* filter, filterarg */ 150 xchan->maxsegsize * xchan->maxnsegs, /* maxsize */ 151 xchan->maxnsegs, /* nsegments */ 152 xchan->maxsegsize, /* maxsegsize */ 153 0, /* flags */ 154 NULL, NULL, /* lockfunc, lockarg */ 155 &xchan->dma_tag_bufs); 156 if (err != 0) { 157 device_printf(xdma->dev, 158 "%s: Can't create bus_dma tag.\n", __func__); 159 return (-1); 160 } 161 162 for (i = 0; i < xchan->xr_num; i++) { 163 xr = &xchan->xr_mem[i]; 164 err = bus_dmamap_create(xchan->dma_tag_bufs, 0, 165 &xr->buf.map); 166 if (err != 0) { 167 device_printf(xdma->dev, 168 "%s: Can't create buf DMA map.\n", __func__); 169 170 /* Cleanup. */ 171 bus_dma_tag_destroy(xchan->dma_tag_bufs); 172 173 return (-1); 174 } 175 } 176 177 return (0); 178 } 179 180 static int 181 xchan_bufs_alloc(xdma_channel_t *xchan) 182 { 183 xdma_controller_t *xdma; 184 int ret; 185 186 xdma = xchan->xdma; 187 188 if (xdma == NULL) { 189 printf("%s: Channel was not allocated properly.\n", __func__); 190 return (-1); 191 } 192 193 if (xchan->caps & XCHAN_CAP_BUSDMA) 194 ret = xchan_bufs_alloc_busdma(xchan); 195 else { 196 ret = xchan_bufs_alloc_reserved(xchan); 197 } 198 if (ret != 0) { 199 device_printf(xdma->dev, 200 "%s: Can't allocate bufs.\n", __func__); 201 return (-1); 202 } 203 204 xchan->flags |= XCHAN_BUFS_ALLOCATED; 205 206 return (0); 207 } 208 209 static int 210 xchan_bufs_free(xdma_channel_t *xchan) 211 { 212 struct xdma_request *xr; 213 struct xchan_buf *b; 214 int i; 215 216 if ((xchan->flags & XCHAN_BUFS_ALLOCATED) == 0) 217 return (-1); 218 219 if (xchan->caps & XCHAN_CAP_BUSDMA) { 220 for (i = 0; i < xchan->xr_num; i++) { 221 xr = &xchan->xr_mem[i]; 222 b = &xr->buf; 223 bus_dmamap_destroy(xchan->dma_tag_bufs, b->map); 224 } 225 bus_dma_tag_destroy(xchan->dma_tag_bufs); 226 } else 227 xchan_bufs_free_reserved(xchan); 228 229 xchan->flags &= ~XCHAN_BUFS_ALLOCATED; 230 231 return (0); 232 } 233 234 void 235 xdma_channel_free_sg(xdma_channel_t *xchan) 236 { 237 238 xchan_bufs_free(xchan); 239 xchan_sglist_free(xchan); 240 xchan_bank_free(xchan); 241 } 242 243 /* 244 * Prepare xchan for a scatter-gather transfer. 245 * xr_num - xdma requests queue size, 246 * maxsegsize - maximum allowed scatter-gather list element size in bytes 247 */ 248 int 249 xdma_prep_sg(xdma_channel_t *xchan, uint32_t xr_num, 250 bus_size_t maxsegsize, bus_size_t maxnsegs, 251 bus_size_t alignment, bus_addr_t boundary, 252 bus_addr_t lowaddr, bus_addr_t highaddr) 253 { 254 xdma_controller_t *xdma; 255 int ret; 256 257 xdma = xchan->xdma; 258 259 KASSERT(xdma != NULL, ("xdma is NULL")); 260 261 if (xchan->flags & XCHAN_CONFIGURED) { 262 device_printf(xdma->dev, 263 "%s: Channel is already configured.\n", __func__); 264 return (-1); 265 } 266 267 xchan->xr_num = xr_num; 268 xchan->maxsegsize = maxsegsize; 269 xchan->maxnsegs = maxnsegs; 270 xchan->alignment = alignment; 271 xchan->boundary = boundary; 272 xchan->lowaddr = lowaddr; 273 xchan->highaddr = highaddr; 274 275 if (xchan->maxnsegs > XDMA_MAX_SEG) { 276 device_printf(xdma->dev, "%s: maxnsegs is too big\n", 277 __func__); 278 return (-1); 279 } 280 281 xchan_bank_init(xchan); 282 283 /* Allocate sglist. */ 284 ret = xchan_sglist_alloc(xchan); 285 if (ret != 0) { 286 device_printf(xdma->dev, 287 "%s: Can't allocate sglist.\n", __func__); 288 return (-1); 289 } 290 291 /* Allocate buffers if required. */ 292 if (xchan->caps & (XCHAN_CAP_BUSDMA | XCHAN_CAP_BOUNCE)) { 293 ret = xchan_bufs_alloc(xchan); 294 if (ret != 0) { 295 device_printf(xdma->dev, 296 "%s: Can't allocate bufs.\n", __func__); 297 298 /* Cleanup */ 299 xchan_sglist_free(xchan); 300 xchan_bank_free(xchan); 301 302 return (-1); 303 } 304 } 305 306 xchan->flags |= (XCHAN_CONFIGURED | XCHAN_TYPE_SG); 307 308 XCHAN_LOCK(xchan); 309 ret = XDMA_CHANNEL_PREP_SG(xdma->dma_dev, xchan); 310 if (ret != 0) { 311 device_printf(xdma->dev, 312 "%s: Can't prepare SG transfer.\n", __func__); 313 XCHAN_UNLOCK(xchan); 314 315 return (-1); 316 } 317 XCHAN_UNLOCK(xchan); 318 319 return (0); 320 } 321 322 void 323 xchan_seg_done(xdma_channel_t *xchan, 324 struct xdma_transfer_status *st) 325 { 326 struct xdma_request *xr; 327 xdma_controller_t *xdma; 328 struct xchan_buf *b; 329 bus_addr_t addr; 330 331 xdma = xchan->xdma; 332 333 xr = TAILQ_FIRST(&xchan->processing); 334 if (xr == NULL) 335 panic("request not found\n"); 336 337 b = &xr->buf; 338 339 atomic_subtract_int(&b->nsegs_left, 1); 340 341 if (b->nsegs_left == 0) { 342 if (xchan->caps & XCHAN_CAP_BUSDMA) { 343 if (xr->direction == XDMA_MEM_TO_DEV) 344 bus_dmamap_sync(xchan->dma_tag_bufs, b->map, 345 BUS_DMASYNC_POSTWRITE); 346 else 347 bus_dmamap_sync(xchan->dma_tag_bufs, b->map, 348 BUS_DMASYNC_POSTREAD); 349 bus_dmamap_unload(xchan->dma_tag_bufs, b->map); 350 } else if (xchan->caps & XCHAN_CAP_BOUNCE) { 351 if (xr->req_type == XR_TYPE_MBUF && 352 xr->direction == XDMA_DEV_TO_MEM) 353 m_copyback(xr->m, 0, st->transferred, 354 (void *)xr->buf.vaddr); 355 } else if (xchan->caps & XCHAN_CAP_IOMMU) { 356 if (xr->direction == XDMA_MEM_TO_DEV) 357 addr = xr->src_addr; 358 else 359 addr = xr->dst_addr; 360 xdma_iommu_remove_entry(xchan, addr); 361 } 362 xr->status.error = st->error; 363 xr->status.transferred = st->transferred; 364 365 QUEUE_PROC_LOCK(xchan); 366 TAILQ_REMOVE(&xchan->processing, xr, xr_next); 367 QUEUE_PROC_UNLOCK(xchan); 368 369 QUEUE_OUT_LOCK(xchan); 370 TAILQ_INSERT_TAIL(&xchan->queue_out, xr, xr_next); 371 QUEUE_OUT_UNLOCK(xchan); 372 } 373 } 374 375 static void 376 xdma_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 377 { 378 struct seg_load_request *slr; 379 struct bus_dma_segment *seg; 380 int i; 381 382 slr = arg; 383 seg = slr->seg; 384 385 if (error != 0) { 386 slr->error = error; 387 return; 388 } 389 390 slr->nsegs = nsegs; 391 392 for (i = 0; i < nsegs; i++) { 393 seg[i].ds_addr = segs[i].ds_addr; 394 seg[i].ds_len = segs[i].ds_len; 395 } 396 } 397 398 static int 399 _xdma_load_data_busdma(xdma_channel_t *xchan, struct xdma_request *xr, 400 struct bus_dma_segment *seg) 401 { 402 xdma_controller_t *xdma; 403 struct seg_load_request slr; 404 uint32_t nsegs; 405 void *addr; 406 int error; 407 408 xdma = xchan->xdma; 409 410 error = 0; 411 nsegs = 0; 412 413 switch (xr->req_type) { 414 case XR_TYPE_MBUF: 415 error = bus_dmamap_load_mbuf_sg(xchan->dma_tag_bufs, 416 xr->buf.map, xr->m, seg, &nsegs, BUS_DMA_NOWAIT); 417 break; 418 case XR_TYPE_BIO: 419 slr.nsegs = 0; 420 slr.error = 0; 421 slr.seg = seg; 422 error = bus_dmamap_load_bio(xchan->dma_tag_bufs, 423 xr->buf.map, xr->bp, xdma_dmamap_cb, &slr, BUS_DMA_NOWAIT); 424 if (slr.error != 0) { 425 device_printf(xdma->dma_dev, 426 "%s: bus_dmamap_load failed, err %d\n", 427 __func__, slr.error); 428 return (0); 429 } 430 nsegs = slr.nsegs; 431 break; 432 case XR_TYPE_VIRT: 433 switch (xr->direction) { 434 case XDMA_MEM_TO_DEV: 435 addr = (void *)xr->src_addr; 436 break; 437 case XDMA_DEV_TO_MEM: 438 addr = (void *)xr->dst_addr; 439 break; 440 default: 441 device_printf(xdma->dma_dev, 442 "%s: Direction is not supported\n", __func__); 443 return (0); 444 } 445 slr.nsegs = 0; 446 slr.error = 0; 447 slr.seg = seg; 448 error = bus_dmamap_load(xchan->dma_tag_bufs, xr->buf.map, 449 addr, (xr->block_len * xr->block_num), 450 xdma_dmamap_cb, &slr, BUS_DMA_NOWAIT); 451 if (slr.error != 0) { 452 device_printf(xdma->dma_dev, 453 "%s: bus_dmamap_load failed, err %d\n", 454 __func__, slr.error); 455 return (0); 456 } 457 nsegs = slr.nsegs; 458 break; 459 default: 460 break; 461 } 462 463 if (error != 0) { 464 if (error == ENOMEM) { 465 /* 466 * Out of memory. Try again later. 467 * TODO: count errors. 468 */ 469 } else 470 device_printf(xdma->dma_dev, 471 "%s: bus_dmamap_load failed with err %d\n", 472 __func__, error); 473 return (0); 474 } 475 476 if (xr->direction == XDMA_MEM_TO_DEV) 477 bus_dmamap_sync(xchan->dma_tag_bufs, xr->buf.map, 478 BUS_DMASYNC_PREWRITE); 479 else 480 bus_dmamap_sync(xchan->dma_tag_bufs, xr->buf.map, 481 BUS_DMASYNC_PREREAD); 482 483 return (nsegs); 484 } 485 486 static int 487 _xdma_load_data(xdma_channel_t *xchan, struct xdma_request *xr, 488 struct bus_dma_segment *seg) 489 { 490 xdma_controller_t *xdma; 491 struct mbuf *m; 492 uint32_t nsegs; 493 vm_offset_t va, addr; 494 bus_addr_t pa; 495 vm_prot_t prot; 496 497 xdma = xchan->xdma; 498 499 m = xr->m; 500 501 KASSERT(xchan->caps & XCHAN_CAP_NOSEG, 502 ("Handling segmented data is not implemented here.")); 503 504 nsegs = 1; 505 506 switch (xr->req_type) { 507 case XR_TYPE_MBUF: 508 if (xchan->caps & XCHAN_CAP_BOUNCE) { 509 if (xr->direction == XDMA_MEM_TO_DEV) 510 m_copydata(m, 0, m->m_pkthdr.len, 511 (void *)xr->buf.vaddr); 512 seg[0].ds_addr = (bus_addr_t)xr->buf.paddr; 513 } else if (xchan->caps & XCHAN_CAP_IOMMU) { 514 addr = mtod(m, bus_addr_t); 515 pa = vtophys(addr); 516 517 if (xr->direction == XDMA_MEM_TO_DEV) 518 prot = VM_PROT_READ; 519 else 520 prot = VM_PROT_WRITE; 521 522 xdma_iommu_add_entry(xchan, &va, 523 pa, m->m_pkthdr.len, prot); 524 525 /* 526 * Save VA so we can unload data later 527 * after completion of this transfer. 528 */ 529 if (xr->direction == XDMA_MEM_TO_DEV) 530 xr->src_addr = va; 531 else 532 xr->dst_addr = va; 533 seg[0].ds_addr = va; 534 } else 535 seg[0].ds_addr = mtod(m, bus_addr_t); 536 seg[0].ds_len = m->m_pkthdr.len; 537 break; 538 case XR_TYPE_BIO: 539 case XR_TYPE_VIRT: 540 default: 541 panic("implement me\n"); 542 } 543 544 return (nsegs); 545 } 546 547 static int 548 xdma_load_data(xdma_channel_t *xchan, 549 struct xdma_request *xr, struct bus_dma_segment *seg) 550 { 551 xdma_controller_t *xdma; 552 int error; 553 int nsegs; 554 555 xdma = xchan->xdma; 556 557 error = 0; 558 nsegs = 0; 559 560 if (xchan->caps & XCHAN_CAP_BUSDMA) 561 nsegs = _xdma_load_data_busdma(xchan, xr, seg); 562 else 563 nsegs = _xdma_load_data(xchan, xr, seg); 564 if (nsegs == 0) 565 return (0); /* Try again later. */ 566 567 xr->buf.nsegs = nsegs; 568 xr->buf.nsegs_left = nsegs; 569 570 return (nsegs); 571 } 572 573 static int 574 xdma_process(xdma_channel_t *xchan, 575 struct xdma_sglist *sg) 576 { 577 struct bus_dma_segment seg[XDMA_MAX_SEG]; 578 struct xdma_request *xr; 579 struct xdma_request *xr_tmp; 580 xdma_controller_t *xdma; 581 uint32_t capacity; 582 uint32_t n; 583 uint32_t c; 584 int nsegs; 585 int ret; 586 587 XCHAN_ASSERT_LOCKED(xchan); 588 589 xdma = xchan->xdma; 590 591 n = 0; 592 c = 0; 593 594 ret = XDMA_CHANNEL_CAPACITY(xdma->dma_dev, xchan, &capacity); 595 if (ret != 0) { 596 device_printf(xdma->dev, 597 "%s: Can't get DMA controller capacity.\n", __func__); 598 return (-1); 599 } 600 601 TAILQ_FOREACH_SAFE(xr, &xchan->queue_in, xr_next, xr_tmp) { 602 switch (xr->req_type) { 603 case XR_TYPE_MBUF: 604 if ((xchan->caps & XCHAN_CAP_NOSEG) || 605 (c > xchan->maxnsegs)) 606 c = xdma_mbuf_defrag(xchan, xr); 607 break; 608 case XR_TYPE_BIO: 609 case XR_TYPE_VIRT: 610 default: 611 c = 1; 612 } 613 614 if (capacity <= (c + n)) { 615 /* 616 * No space yet available for the entire 617 * request in the DMA engine. 618 */ 619 break; 620 } 621 622 if ((c + n + xchan->maxnsegs) >= XDMA_SGLIST_MAXLEN) { 623 /* Sglist is full. */ 624 break; 625 } 626 627 nsegs = xdma_load_data(xchan, xr, seg); 628 if (nsegs == 0) 629 break; 630 631 xdma_sglist_add(&sg[n], seg, nsegs, xr); 632 n += nsegs; 633 634 QUEUE_IN_LOCK(xchan); 635 TAILQ_REMOVE(&xchan->queue_in, xr, xr_next); 636 QUEUE_IN_UNLOCK(xchan); 637 638 QUEUE_PROC_LOCK(xchan); 639 TAILQ_INSERT_TAIL(&xchan->processing, xr, xr_next); 640 QUEUE_PROC_UNLOCK(xchan); 641 } 642 643 return (n); 644 } 645 646 int 647 xdma_queue_submit_sg(xdma_channel_t *xchan) 648 { 649 struct xdma_sglist *sg; 650 xdma_controller_t *xdma; 651 uint32_t sg_n; 652 int ret; 653 654 xdma = xchan->xdma; 655 KASSERT(xdma != NULL, ("xdma is NULL")); 656 657 XCHAN_ASSERT_LOCKED(xchan); 658 659 sg = xchan->sg; 660 661 if ((xchan->caps & (XCHAN_CAP_BOUNCE | XCHAN_CAP_BUSDMA)) && 662 (xchan->flags & XCHAN_BUFS_ALLOCATED) == 0) { 663 device_printf(xdma->dev, 664 "%s: Can't submit a transfer: no bufs\n", 665 __func__); 666 return (-1); 667 } 668 669 sg_n = xdma_process(xchan, sg); 670 if (sg_n == 0) 671 return (0); /* Nothing to submit */ 672 673 /* Now submit sglist to DMA engine driver. */ 674 ret = XDMA_CHANNEL_SUBMIT_SG(xdma->dma_dev, xchan, sg, sg_n); 675 if (ret != 0) { 676 device_printf(xdma->dev, 677 "%s: Can't submit an sglist.\n", __func__); 678 return (-1); 679 } 680 681 return (0); 682 } 683