1 /** 2 * \file drm_dma.c 3 * DMA IOCTL and function support 4 * 5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 6 * \author Gareth Hughes <gareth@valinux.com> 7 */ 8 9 /*- 10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com 11 * 12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 * All Rights Reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person obtaining a 17 * copy of this software and associated documentation files (the "Software"), 18 * to deal in the Software without restriction, including without limitation 19 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 * and/or sell copies of the Software, and to permit persons to whom the 21 * Software is furnished to do so, subject to the following conditions: 22 * 23 * The above copyright notice and this permission notice (including the next 24 * paragraph) shall be included in all copies or substantial portions of the 25 * Software. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 * OTHER DEALINGS IN THE SOFTWARE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <dev/drm2/drmP.h> 40 41 /** 42 * Initialize the DMA data. 43 * 44 * \param dev DRM device. 45 * \return zero on success or a negative value on failure. 46 * 47 * Allocate and initialize a drm_device_dma structure. 48 */ 49 int drm_dma_setup(struct drm_device *dev) 50 { 51 int i; 52 53 dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO); 54 if (!dev->dma) 55 return -ENOMEM; 56 57 for (i = 0; i <= DRM_MAX_ORDER; i++) 58 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); 59 60 return 0; 61 } 62 63 /** 64 * Cleanup the DMA resources. 65 * 66 * \param dev DRM device. 67 * 68 * Free all pages associated with DMA buffers, the buffers and pages lists, and 69 * finally the drm_device::dma structure itself. 70 */ 71 void drm_dma_takedown(struct drm_device *dev) 72 { 73 struct drm_device_dma *dma = dev->dma; 74 int i, j; 75 76 if (!dma) 77 return; 78 79 /* Clear dma buffers */ 80 for (i = 0; i <= DRM_MAX_ORDER; i++) { 81 if (dma->bufs[i].seg_count) { 82 DRM_DEBUG("order %d: buf_count = %d," 83 " seg_count = %d\n", 84 i, 85 dma->bufs[i].buf_count, 86 dma->bufs[i].seg_count); 87 for (j = 0; j < dma->bufs[i].seg_count; j++) { 88 if (dma->bufs[i].seglist[j]) { 89 drm_pci_free(dev, dma->bufs[i].seglist[j]); 90 } 91 } 92 free(dma->bufs[i].seglist, DRM_MEM_SEGS); 93 } 94 if (dma->bufs[i].buf_count) { 95 for (j = 0; j < dma->bufs[i].buf_count; j++) { 96 free(dma->bufs[i].buflist[j].dev_private, 97 DRM_MEM_BUFS); 98 } 99 free(dma->bufs[i].buflist, DRM_MEM_BUFS); 100 } 101 } 102 103 free(dma->buflist, DRM_MEM_BUFS); 104 free(dma->pagelist, DRM_MEM_PAGES); 105 free(dev->dma, DRM_MEM_DRIVER); 106 dev->dma = NULL; 107 } 108 109 /** 110 * Free a buffer. 111 * 112 * \param dev DRM device. 113 * \param buf buffer to free. 114 * 115 * Resets the fields of \p buf. 116 */ 117 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf) 118 { 119 if (!buf) 120 return; 121 122 buf->waiting = 0; 123 buf->pending = 0; 124 buf->file_priv = NULL; 125 buf->used = 0; 126 } 127 128 /** 129 * Reclaim the buffers. 130 * 131 * \param file_priv DRM file private. 132 * 133 * Frees each buffer associated with \p file_priv not already on the hardware. 134 */ 135 void drm_core_reclaim_buffers(struct drm_device *dev, 136 struct drm_file *file_priv) 137 { 138 struct drm_device_dma *dma = dev->dma; 139 int i; 140 141 if (!dma) 142 return; 143 for (i = 0; i < dma->buf_count; i++) { 144 if (dma->buflist[i]->file_priv == file_priv) { 145 switch (dma->buflist[i]->list) { 146 case DRM_LIST_NONE: 147 drm_free_buffer(dev, dma->buflist[i]); 148 break; 149 case DRM_LIST_WAIT: 150 dma->buflist[i]->list = DRM_LIST_RECLAIM; 151 break; 152 default: 153 /* Buffer already on hardware. */ 154 break; 155 } 156 } 157 } 158 } 159 160 EXPORT_SYMBOL(drm_core_reclaim_buffers); 161