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/drm2/drmP.h> 35 36 /**********************************************************************/ 37 /** \name PCI memory */ 38 /*@{*/ 39 40 static void 41 drm_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 */ 56 drm_dma_handle_t * 57 drm_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 mutexes here */ 75 mtx_assert(&dev->dma_lock, MA_NOTOWNED); 76 if (mtx_owned(&dev->dma_lock)) 77 DRM_ERROR("called while holding dma_lock\n"); 78 79 ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */ 80 maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */ 81 NULL, NULL, /* filtfunc, filtfuncargs */ 82 size, 1, size, /* maxsize, nsegs, maxsegsize */ 83 0, NULL, NULL, /* flags, lockfunc, lockfuncargs */ 84 &dmah->tag); 85 if (ret != 0) { 86 free(dmah, DRM_MEM_DMA); 87 return NULL; 88 } 89 90 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, 91 BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map); 92 if (ret != 0) { 93 bus_dma_tag_destroy(dmah->tag); 94 free(dmah, DRM_MEM_DMA); 95 return NULL; 96 } 97 98 ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size, 99 drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT); 100 if (ret != 0) { 101 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 102 bus_dma_tag_destroy(dmah->tag); 103 free(dmah, DRM_MEM_DMA); 104 return NULL; 105 } 106 107 return dmah; 108 } 109 110 /** 111 * \brief Free a DMA-accessible consistent memory block. 112 */ 113 void 114 drm_pci_free(struct drm_device *dev, drm_dma_handle_t *dmah) 115 { 116 if (dmah == NULL) 117 return; 118 119 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map); 120 bus_dma_tag_destroy(dmah->tag); 121 122 free(dmah, DRM_MEM_DMA); 123 } 124 125 /*@}*/ 126