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 /** 25 * \file drm_pci.h 26 * \brief PCI consistent, DMA-accessible memory allocation. 27 * 28 * \author Eric Anholt <anholt@FreeBSD.org> 29 */ 30 31 #include "dev/drm/drmP.h" 32 33 /**********************************************************************/ 34 /** \name PCI memory */ 35 /*@{*/ 36 37 static void 38 drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error) 39 { 40 drm_dma_handle_t *dmah = arg; 41 42 if (error != 0) 43 return; 44 45 KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count")); 46 dmah->busaddr = segs[0].ds_addr; 47 } 48 49 /** 50 * \brief Allocate a physically contiguous DMA-accessible consistent 51 * memory block. 52 */ 53 drm_dma_handle_t * 54 drm_pci_alloc(struct drm_device *dev, size_t size, 55 size_t align, dma_addr_t maxaddr) 56 { 57 drm_dma_handle_t *dmah; 58 int ret; 59 60 /* Need power-of-two alignment, so fail the allocation if it isn't. */ 61 if ((align & (align - 1)) != 0) { 62 DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n", 63 (int)align); 64 return NULL; 65 } 66 67 dmah = malloc(sizeof(drm_dma_handle_t), DRM_MEM_DMA, M_ZERO | M_NOWAIT); 68 if (dmah == NULL) 69 return NULL; 70 71 #if 0 /* HT XXX XXX XXX */ 72 /* Make sure we aren't holding locks here */ 73 mtx_assert(&dev->dev_lock, MA_NOTOWNED); 74 if (mtx_owned(&dev->dev_lock)) 75 DRM_ERROR("called while holding dev_lock\n"); 76 mtx_assert(&dev->dma_lock, MA_NOTOWNED); 77 if (mtx_owned(&dev->dma_lock)) 78 DRM_ERROR("called while holding dma_lock\n"); 79 #endif 80 81 ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */ 82 maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */ 83 NULL, NULL, /* filtfunc, filtfuncargs */ 84 size, 1, size, /* maxsize, nsegs, maxsegsize */ 85 0, /* flags */ 86 &dmah->tag); 87 if (ret != 0) { 88 free(dmah, DRM_MEM_DMA); 89 return NULL; 90 } 91 92 /* XXX BUS_DMA_NOCACHE */ 93 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, 94 BUS_DMA_WAITOK | BUS_DMA_ZERO, &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 */ 116 void 117 drm_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