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 #include <dev/drm2/drmP.h> 38 39 /** 40 * Initialize the DMA data. 41 * 42 * \param dev DRM device. 43 * \return zero on success or a negative value on failure. 44 * 45 * Allocate and initialize a drm_device_dma structure. 46 */ 47 int drm_dma_setup(struct drm_device *dev) 48 { 49 int i; 50 51 dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO); 52 if (!dev->dma) 53 return -ENOMEM; 54 55 for (i = 0; i <= DRM_MAX_ORDER; i++) 56 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); 57 58 return 0; 59 } 60 61 /** 62 * Cleanup the DMA resources. 63 * 64 * \param dev DRM device. 65 * 66 * Free all pages associated with DMA buffers, the buffers and pages lists, and 67 * finally the drm_device::dma structure itself. 68 */ 69 void drm_dma_takedown(struct drm_device *dev) 70 { 71 struct drm_device_dma *dma = dev->dma; 72 int i, j; 73 74 if (!dma) 75 return; 76 77 /* Clear dma buffers */ 78 for (i = 0; i <= DRM_MAX_ORDER; i++) { 79 if (dma->bufs[i].seg_count) { 80 DRM_DEBUG("order %d: buf_count = %d," 81 " seg_count = %d\n", 82 i, 83 dma->bufs[i].buf_count, 84 dma->bufs[i].seg_count); 85 for (j = 0; j < dma->bufs[i].seg_count; j++) { 86 if (dma->bufs[i].seglist[j]) { 87 drm_pci_free(dev, dma->bufs[i].seglist[j]); 88 } 89 } 90 free(dma->bufs[i].seglist, DRM_MEM_SEGS); 91 } 92 if (dma->bufs[i].buf_count) { 93 for (j = 0; j < dma->bufs[i].buf_count; j++) { 94 free(dma->bufs[i].buflist[j].dev_private, 95 DRM_MEM_BUFS); 96 } 97 free(dma->bufs[i].buflist, DRM_MEM_BUFS); 98 } 99 } 100 101 free(dma->buflist, DRM_MEM_BUFS); 102 free(dma->pagelist, DRM_MEM_PAGES); 103 free(dev->dma, DRM_MEM_DRIVER); 104 dev->dma = NULL; 105 } 106 107 /** 108 * Free a buffer. 109 * 110 * \param dev DRM device. 111 * \param buf buffer to free. 112 * 113 * Resets the fields of \p buf. 114 */ 115 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf) 116 { 117 if (!buf) 118 return; 119 120 buf->waiting = 0; 121 buf->pending = 0; 122 buf->file_priv = NULL; 123 buf->used = 0; 124 } 125 126 /** 127 * Reclaim the buffers. 128 * 129 * \param file_priv DRM file private. 130 * 131 * Frees each buffer associated with \p file_priv not already on the hardware. 132 */ 133 void drm_core_reclaim_buffers(struct drm_device *dev, 134 struct drm_file *file_priv) 135 { 136 struct drm_device_dma *dma = dev->dma; 137 int i; 138 139 if (!dma) 140 return; 141 for (i = 0; i < dma->buf_count; i++) { 142 if (dma->buflist[i]->file_priv == file_priv) { 143 switch (dma->buflist[i]->list) { 144 case DRM_LIST_NONE: 145 drm_free_buffer(dev, dma->buflist[i]); 146 break; 147 case DRM_LIST_WAIT: 148 dma->buflist[i]->list = DRM_LIST_RECLAIM; 149 break; 150 default: 151 /* Buffer already on hardware. */ 152 break; 153 } 154 } 155 } 156 } 157 158 EXPORT_SYMBOL(drm_core_reclaim_buffers); 159