| busdma_bounce.c (302408) | busdma_bounce.c (318976) |
|---|---|
| 1/*- 2 * Copyright (c) 1997, 1998 Justin T. Gibbs. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 11 unchanged lines hidden (view full) --- 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 1997, 1998 Justin T. Gibbs. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright --- 11 unchanged lines hidden (view full) --- 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> |
| 28__FBSDID("$FreeBSD: stable/11/sys/x86/x86/busdma_bounce.c 298044 2016-04-15 09:21:50Z royger $"); | 28__FBSDID("$FreeBSD: stable/11/sys/x86/x86/busdma_bounce.c 318976 2017-05-27 07:47:52Z hselasky $"); |
| 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/malloc.h> 33#include <sys/bus.h> 34#include <sys/interrupt.h> 35#include <sys/kernel.h> 36#include <sys/ktr.h> --- 354 unchanged lines hidden (view full) --- 391 } 392 if (flags & BUS_DMA_ZERO) 393 mflags |= M_ZERO; 394 if (flags & BUS_DMA_NOCACHE) 395 attr = VM_MEMATTR_UNCACHEABLE; 396 else 397 attr = VM_MEMATTR_DEFAULT; 398 | 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/malloc.h> 33#include <sys/bus.h> 34#include <sys/interrupt.h> 35#include <sys/kernel.h> 36#include <sys/ktr.h> --- 354 unchanged lines hidden (view full) --- 391 } 392 if (flags & BUS_DMA_ZERO) 393 mflags |= M_ZERO; 394 if (flags & BUS_DMA_NOCACHE) 395 attr = VM_MEMATTR_UNCACHEABLE; 396 else 397 attr = VM_MEMATTR_DEFAULT; 398 |
| 399 /* 400 * XXX: 401 * (dmat->alignment <= dmat->maxsize) is just a quick hack; the exact 402 * alignment guarantees of malloc need to be nailed down, and the 403 * code below should be rewritten to take that into account. | 399 /* 400 * Allocate the buffer from the malloc(9) allocator if... 401 * - It's small enough to fit into a single power of two sized bucket. 402 * - The alignment is less than or equal to the maximum size 403 * - The low address requirement is fulfilled. 404 * else allocate non-contiguous pages if... 405 * - The page count that could get allocated doesn't exceed 406 * nsegments also when the maximum segment size is less 407 * than PAGE_SIZE. 408 * - The alignment constraint isn't larger than a page boundary. 409 * - There are no boundary-crossing constraints. 410 * else allocate a block of contiguous pages because one or more of the 411 * constraints is something that only the contig allocator can fulfill. |
| 404 * | 412 * |
| 405 * In the meantime, we'll warn the user if malloc gets it wrong. | 413 * NOTE: The (dmat->common.alignment <= dmat->maxsize) check 414 * below is just a quick hack. The exact alignment guarantees 415 * of malloc(9) need to be nailed down, and the code below 416 * should be rewritten to take that into account. 417 * 418 * In the meantime warn the user if malloc gets it wrong. |
| 406 */ 407 if ((dmat->common.maxsize <= PAGE_SIZE) && 408 (dmat->common.alignment <= dmat->common.maxsize) && 409 dmat->common.lowaddr >= ptoa((vm_paddr_t)Maxmem) && 410 attr == VM_MEMATTR_DEFAULT) { 411 *vaddr = malloc(dmat->common.maxsize, M_DEVBUF, mflags); | 419 */ 420 if ((dmat->common.maxsize <= PAGE_SIZE) && 421 (dmat->common.alignment <= dmat->common.maxsize) && 422 dmat->common.lowaddr >= ptoa((vm_paddr_t)Maxmem) && 423 attr == VM_MEMATTR_DEFAULT) { 424 *vaddr = malloc(dmat->common.maxsize, M_DEVBUF, mflags); |
| 412 } else if (dmat->common.nsegments >= btoc(dmat->common.maxsize) && | 425 } else if (dmat->common.nsegments >= 426 howmany(dmat->common.maxsize, MIN(dmat->common.maxsegsz, PAGE_SIZE)) && |
| 413 dmat->common.alignment <= PAGE_SIZE && | 427 dmat->common.alignment <= PAGE_SIZE && |
| 414 (dmat->common.boundary == 0 || 415 dmat->common.boundary >= dmat->common.lowaddr)) { | 428 (dmat->common.boundary % PAGE_SIZE) == 0) { |
| 416 /* Page-based multi-segment allocations allowed */ 417 *vaddr = (void *)kmem_alloc_attr(kernel_arena, 418 dmat->common.maxsize, mflags, 0ul, dmat->common.lowaddr, 419 attr); 420 dmat->bounce_flags |= BUS_DMA_KMEM_ALLOC; 421 } else { 422 *vaddr = (void *)kmem_alloc_contig(kernel_arena, 423 dmat->common.maxsize, mflags, 0ul, dmat->common.lowaddr, --- 843 unchanged lines hidden --- | 429 /* Page-based multi-segment allocations allowed */ 430 *vaddr = (void *)kmem_alloc_attr(kernel_arena, 431 dmat->common.maxsize, mflags, 0ul, dmat->common.lowaddr, 432 attr); 433 dmat->bounce_flags |= BUS_DMA_KMEM_ALLOC; 434 } else { 435 *vaddr = (void *)kmem_alloc_contig(kernel_arena, 436 dmat->common.maxsize, mflags, 0ul, dmat->common.lowaddr, --- 843 unchanged lines hidden --- |