1/*- 2 * Copyright 2003 Eric Anholt. 3 * All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 21 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 22 */ 23 24#include <sys/cdefs.h> 25__FBSDID("$FreeBSD$"); 26 27/** 28 * \file drm_pci.h 29 * \brief PCI consistent, DMA-accessible memory allocation. 30 * 31 * \author Eric Anholt <anholt@FreeBSD.org> 32 */ 33 34#include "dev/drm/drmP.h" 35 36/**********************************************************************/ 37/** \name PCI memory */ 38/*@{*/ 39 40static void 41drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 42{ 43 drm_dma_handle_t *dmah = arg; 44 45 if (error != 0) 46 return; 47 48 KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count")); 49 dmah->busaddr = segs[0].ds_addr; 50} 51 52/** 53 * \brief Allocate a physically contiguous DMA-accessible consistent 54 * memory block. 55 */ 56drm_dma_handle_t * 57drm_pci_alloc(struct drm_device *dev, size_t size, 58 size_t align, dma_addr_t maxaddr) 59{ 60 drm_dma_handle_t *dmah; 61 int ret; 62 63 /* Need power-of-two alignment, so fail the allocation if it isn't. */ 64 if ((align & (align - 1)) != 0) { 65 DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n", 66 (int)align); 67 return NULL; 68 } 69 70 dmah = malloc(sizeof(drm_dma_handle_t), DRM_MEM_DMA, M_ZERO | M_NOWAIT); 71 if (dmah == NULL) 72 return NULL; 73 74 /* Make sure we aren't holding locks here */ 75 mtx_assert(&dev->dev_lock, MA_NOTOWNED); 76 if (mtx_owned(&dev->dev_lock)) 77 DRM_ERROR("called while holding dev_lock\n"); 78 mtx_assert(&dev->dma_lock, MA_NOTOWNED); 79 if (mtx_owned(&dev->dma_lock)) 80 DRM_ERROR("called while holding dma_lock\n"); 81 82 ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */ 83 maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */ 84 NULL, NULL, /* filtfunc, filtfuncargs */ 85 size, 1, size, /* maxsize, nsegs, maxsegsize */ 86 0, NULL, NULL, /* flags, lockfunc, lockfuncargs */ 87 &dmah->tag); 88 if (ret != 0) { 89 free(dmah, DRM_MEM_DMA); 90 return NULL; 91 } 92 93 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, 94 BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map); 95 if (ret != 0) { 96 bus_dma_tag_destroy(dmah->tag); 97 free(dmah, DRM_MEM_DMA); 98 return NULL; 99 } 100 101 ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size, 102 drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT); 103 if (ret != 0) { 104 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 105 bus_dma_tag_destroy(dmah->tag); 106 free(dmah, DRM_MEM_DMA); 107 return NULL; 108 } 109 110 return dmah; 111} 112 113/** 114 * \brief Free a DMA-accessible consistent memory block. 115 */ 116void 117drm_pci_free(struct drm_device *dev, drm_dma_handle_t *dmah) 118{ 119 if (dmah == NULL) 120 return; 121 122 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 123 bus_dma_tag_destroy(dmah->tag); 124 125 free(dmah, DRM_MEM_DMA); 126} 127 128/*@}*/ 129