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 device_printf(xdma->dev, 190 "%s: Channel was not allocated properly.\n", __func__); 191 return (-1); 192 } 193 194 if (xchan->caps & XCHAN_CAP_BUSDMA) 195 ret = xchan_bufs_alloc_busdma(xchan); 196 else { 197 ret = xchan_bufs_alloc_reserved(xchan); 198 } 199 if (ret != 0) { 200 device_printf(xdma->dev, 201 "%s: Can't allocate bufs.\n", __func__); 202 return (-1); 203 } 204 205 xchan->flags |= XCHAN_BUFS_ALLOCATED; 206 207 return (0); 208 } 209 210 static int 211 xchan_bufs_free(xdma_channel_t *xchan) 212 { 213 struct xdma_request *xr; 214 struct xchan_buf *b; 215 int i; 216 217 if ((xchan->flags & XCHAN_BUFS_ALLOCATED) == 0) 218 return (-1); 219 220 if (xchan->caps & XCHAN_CAP_BUSDMA) { 221 for (i = 0; i < xchan->xr_num; i++) { 222 xr = &xchan->xr_mem[i]; 223 b = &xr->buf; 224 bus_dmamap_destroy(xchan->dma_tag_bufs, b->map); 225 } 226 bus_dma_tag_destroy(xchan->dma_tag_bufs); 227 } else 228 xchan_bufs_free_reserved(xchan); 229 230 xchan->flags &= ~XCHAN_BUFS_ALLOCATED; 231 232 return (0); 233 } 234 235 void 236 xdma_channel_free_sg(xdma_channel_t *xchan) 237 { 238 239 xchan_bufs_free(xchan); 240 xchan_sglist_free(xchan); 241 xchan_bank_free(xchan); 242 } 243 244 /* 245 * Prepare xchan for a scatter-gather transfer. 246 * xr_num - xdma requests queue size, 247 * maxsegsize - maximum allowed scatter-gather list element size in bytes 248 */ 249 int 250 xdma_prep_sg(xdma_channel_t *xchan, uint32_t xr_num, 251 bus_size_t maxsegsize, bus_size_t maxnsegs, 252 bus_size_t alignment, bus_addr_t boundary, 253 bus_addr_t lowaddr, bus_addr_t highaddr) 254 { 255 xdma_controller_t *xdma; 256 int ret; 257 258 xdma = xchan->xdma; 259 260 KASSERT(xdma != NULL, ("xdma is NULL")); 261 262 if (xchan->flags & XCHAN_CONFIGURED) { 263 device_printf(xdma->dev, 264 "%s: Channel is already configured.\n", __func__); 265 return (-1); 266 } 267 268 xchan->xr_num = xr_num; 269 xchan->maxsegsize = maxsegsize; 270 xchan->maxnsegs = maxnsegs; 271 xchan->alignment = alignment; 272 xchan->boundary = boundary; 273 xchan->lowaddr = lowaddr; 274 xchan->highaddr = highaddr; 275 276 if (xchan->maxnsegs > XDMA_MAX_SEG) { 277 device_printf(xdma->dev, "%s: maxnsegs is too big\n", 278 __func__); 279 return (-1); 280 } 281 282 xchan_bank_init(xchan); 283 284 /* Allocate sglist. */ 285 ret = xchan_sglist_alloc(xchan); 286 if (ret != 0) { 287 device_printf(xdma->dev, 288 "%s: Can't allocate sglist.\n", __func__); 289 return (-1); 290 } 291 292 /* Allocate buffers if required. */ 293 if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0) { 294 ret = xchan_bufs_alloc(xchan); 295 if (ret != 0) { 296 device_printf(xdma->dev, 297 "%s: Can't allocate bufs.\n", __func__); 298 299 /* Cleanup */ 300 xchan_sglist_free(xchan); 301 xchan_bank_free(xchan); 302 303 return (-1); 304 } 305 } 306 307 xchan->flags |= (XCHAN_CONFIGURED | XCHAN_TYPE_SG); 308 309 XCHAN_LOCK(xchan); 310 ret = XDMA_CHANNEL_PREP_SG(xdma->dma_dev, xchan); 311 if (ret != 0) { 312 device_printf(xdma->dev, 313 "%s: Can't prepare SG transfer.\n", __func__); 314 XCHAN_UNLOCK(xchan); 315 316 return (-1); 317 } 318 XCHAN_UNLOCK(xchan); 319 320 return (0); 321 } 322 323 void 324 xchan_seg_done(xdma_channel_t *xchan, 325 struct xdma_transfer_status *st) 326 { 327 struct xdma_request *xr; 328 xdma_controller_t *xdma; 329 struct xchan_buf *b; 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 { 351 if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0 && 352 xr->req_type == XR_TYPE_MBUF && 353 xr->direction == XDMA_DEV_TO_MEM) 354 m_copyback(xr->m, 0, st->transferred, 355 (void *)xr->buf.vaddr); 356 } 357 xr->status.error = st->error; 358 xr->status.transferred = st->transferred; 359 360 QUEUE_PROC_LOCK(xchan); 361 TAILQ_REMOVE(&xchan->processing, xr, xr_next); 362 QUEUE_PROC_UNLOCK(xchan); 363 364 QUEUE_OUT_LOCK(xchan); 365 TAILQ_INSERT_TAIL(&xchan->queue_out, xr, xr_next); 366 QUEUE_OUT_UNLOCK(xchan); 367 } 368 } 369 370 static void 371 xdma_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 372 { 373 struct seg_load_request *slr; 374 struct bus_dma_segment *seg; 375 int i; 376 377 slr = arg; 378 seg = slr->seg; 379 380 if (error != 0) { 381 slr->error = error; 382 return; 383 } 384 385 slr->nsegs = nsegs; 386 387 for (i = 0; i < nsegs; i++) { 388 seg[i].ds_addr = segs[i].ds_addr; 389 seg[i].ds_len = segs[i].ds_len; 390 } 391 } 392 393 static int 394 _xdma_load_data_busdma(xdma_channel_t *xchan, struct xdma_request *xr, 395 struct bus_dma_segment *seg) 396 { 397 xdma_controller_t *xdma; 398 struct seg_load_request slr; 399 uint32_t nsegs; 400 void *addr; 401 int error; 402 403 xdma = xchan->xdma; 404 405 error = 0; 406 nsegs = 0; 407 408 switch (xr->req_type) { 409 case XR_TYPE_MBUF: 410 error = bus_dmamap_load_mbuf_sg(xchan->dma_tag_bufs, 411 xr->buf.map, xr->m, seg, &nsegs, BUS_DMA_NOWAIT); 412 break; 413 case XR_TYPE_BIO: 414 slr.nsegs = 0; 415 slr.error = 0; 416 slr.seg = seg; 417 error = bus_dmamap_load_bio(xchan->dma_tag_bufs, 418 xr->buf.map, xr->bp, xdma_dmamap_cb, &slr, BUS_DMA_NOWAIT); 419 if (slr.error != 0) { 420 device_printf(xdma->dma_dev, 421 "%s: bus_dmamap_load failed, err %d\n", 422 __func__, slr.error); 423 return (0); 424 } 425 nsegs = slr.nsegs; 426 break; 427 case XR_TYPE_VIRT: 428 switch (xr->direction) { 429 case XDMA_MEM_TO_DEV: 430 addr = (void *)xr->src_addr; 431 break; 432 case XDMA_DEV_TO_MEM: 433 addr = (void *)xr->dst_addr; 434 break; 435 default: 436 device_printf(xdma->dma_dev, 437 "%s: Direction is not supported\n", __func__); 438 return (0); 439 } 440 slr.nsegs = 0; 441 slr.error = 0; 442 slr.seg = seg; 443 error = bus_dmamap_load(xchan->dma_tag_bufs, xr->buf.map, 444 addr, (xr->block_len * xr->block_num), 445 xdma_dmamap_cb, &slr, BUS_DMA_NOWAIT); 446 if (slr.error != 0) { 447 device_printf(xdma->dma_dev, 448 "%s: bus_dmamap_load failed, err %d\n", 449 __func__, slr.error); 450 return (0); 451 } 452 nsegs = slr.nsegs; 453 break; 454 default: 455 break; 456 } 457 458 if (error != 0) { 459 if (error == ENOMEM) { 460 /* 461 * Out of memory. Try again later. 462 * TODO: count errors. 463 */ 464 } else 465 device_printf(xdma->dma_dev, 466 "%s: bus_dmamap_load failed with err %d\n", 467 __func__, error); 468 return (0); 469 } 470 471 if (xr->direction == XDMA_MEM_TO_DEV) 472 bus_dmamap_sync(xchan->dma_tag_bufs, xr->buf.map, 473 BUS_DMASYNC_PREWRITE); 474 else 475 bus_dmamap_sync(xchan->dma_tag_bufs, xr->buf.map, 476 BUS_DMASYNC_PREREAD); 477 478 return (nsegs); 479 } 480 481 static int 482 _xdma_load_data(xdma_channel_t *xchan, struct xdma_request *xr, 483 struct bus_dma_segment *seg) 484 { 485 xdma_controller_t *xdma; 486 struct mbuf *m; 487 uint32_t nsegs; 488 489 xdma = xchan->xdma; 490 491 m = xr->m; 492 493 nsegs = 1; 494 495 switch (xr->req_type) { 496 case XR_TYPE_MBUF: 497 if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0) { 498 if (xr->direction == XDMA_MEM_TO_DEV) 499 m_copydata(m, 0, m->m_pkthdr.len, 500 (void *)xr->buf.vaddr); 501 seg[0].ds_addr = (bus_addr_t)xr->buf.paddr; 502 } else 503 seg[0].ds_addr = mtod(m, bus_addr_t); 504 seg[0].ds_len = m->m_pkthdr.len; 505 break; 506 case XR_TYPE_BIO: 507 case XR_TYPE_VIRT: 508 default: 509 panic("implement me\n"); 510 } 511 512 return (nsegs); 513 } 514 515 static int 516 xdma_load_data(xdma_channel_t *xchan, 517 struct xdma_request *xr, struct bus_dma_segment *seg) 518 { 519 xdma_controller_t *xdma; 520 int error; 521 int nsegs; 522 523 xdma = xchan->xdma; 524 525 error = 0; 526 nsegs = 0; 527 528 if (xchan->caps & XCHAN_CAP_BUSDMA) 529 nsegs = _xdma_load_data_busdma(xchan, xr, seg); 530 else 531 nsegs = _xdma_load_data(xchan, xr, seg); 532 if (nsegs == 0) 533 return (0); /* Try again later. */ 534 535 xr->buf.nsegs = nsegs; 536 xr->buf.nsegs_left = nsegs; 537 538 return (nsegs); 539 } 540 541 static int 542 xdma_process(xdma_channel_t *xchan, 543 struct xdma_sglist *sg) 544 { 545 struct bus_dma_segment seg[XDMA_MAX_SEG]; 546 struct xdma_request *xr; 547 struct xdma_request *xr_tmp; 548 xdma_controller_t *xdma; 549 uint32_t capacity; 550 uint32_t n; 551 uint32_t c; 552 int nsegs; 553 int ret; 554 555 XCHAN_ASSERT_LOCKED(xchan); 556 557 xdma = xchan->xdma; 558 559 n = 0; 560 c = 0; 561 562 ret = XDMA_CHANNEL_CAPACITY(xdma->dma_dev, xchan, &capacity); 563 if (ret != 0) { 564 device_printf(xdma->dev, 565 "%s: Can't get DMA controller capacity.\n", __func__); 566 return (-1); 567 } 568 569 TAILQ_FOREACH_SAFE(xr, &xchan->queue_in, xr_next, xr_tmp) { 570 switch (xr->req_type) { 571 case XR_TYPE_MBUF: 572 if ((xchan->caps & XCHAN_CAP_NOSEG) || 573 (c > xchan->maxnsegs)) 574 c = xdma_mbuf_defrag(xchan, xr); 575 break; 576 case XR_TYPE_BIO: 577 case XR_TYPE_VIRT: 578 default: 579 c = 1; 580 } 581 582 if (capacity <= (c + n)) { 583 /* 584 * No space yet available for the entire 585 * request in the DMA engine. 586 */ 587 break; 588 } 589 590 if ((c + n + xchan->maxnsegs) >= XDMA_SGLIST_MAXLEN) { 591 /* Sglist is full. */ 592 break; 593 } 594 595 nsegs = xdma_load_data(xchan, xr, seg); 596 if (nsegs == 0) 597 break; 598 599 xdma_sglist_add(&sg[n], seg, nsegs, xr); 600 n += nsegs; 601 602 QUEUE_IN_LOCK(xchan); 603 TAILQ_REMOVE(&xchan->queue_in, xr, xr_next); 604 QUEUE_IN_UNLOCK(xchan); 605 606 QUEUE_PROC_LOCK(xchan); 607 TAILQ_INSERT_TAIL(&xchan->processing, xr, xr_next); 608 QUEUE_PROC_UNLOCK(xchan); 609 } 610 611 return (n); 612 } 613 614 int 615 xdma_queue_submit_sg(xdma_channel_t *xchan) 616 { 617 struct xdma_sglist *sg; 618 xdma_controller_t *xdma; 619 uint32_t sg_n; 620 int ret; 621 622 xdma = xchan->xdma; 623 KASSERT(xdma != NULL, ("xdma is NULL")); 624 625 XCHAN_ASSERT_LOCKED(xchan); 626 627 sg = xchan->sg; 628 629 if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0 && 630 (xchan->flags & XCHAN_BUFS_ALLOCATED) == 0) { 631 device_printf(xdma->dev, 632 "%s: Can't submit a transfer: no bufs\n", 633 __func__); 634 return (-1); 635 } 636 637 sg_n = xdma_process(xchan, sg); 638 if (sg_n == 0) 639 return (0); /* Nothing to submit */ 640 641 /* Now submit sglist to DMA engine driver. */ 642 ret = XDMA_CHANNEL_SUBMIT_SG(xdma->dma_dev, xchan, sg, sg_n); 643 if (ret != 0) { 644 device_printf(xdma->dev, 645 "%s: Can't submit an sglist.\n", __func__); 646 return (-1); 647 } 648 649 return (0); 650 } 651