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 "drmP.h" 37 38 /** 39 * Initialize the DMA data. 40 * 41 * \param dev DRM device. 42 * \return zero on success or a negative value on failure. 43 * 44 * Allocate and initialize a drm_device_dma structure. 45 */ 46 int drm_dma_setup(struct drm_device *dev) 47 { 48 int i; 49 50 dev->dma = kmalloc(sizeof(*dev->dma), GFP_KERNEL); 51 if (!dev->dma) 52 return -ENOMEM; 53 54 memset(dev->dma, 0, sizeof(*dev->dma)); 55 56 for (i = 0; i <= DRM_MAX_ORDER; i++) 57 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); 58 59 return 0; 60 } 61 62 /** 63 * Cleanup the DMA resources. 64 * 65 * \param dev DRM device. 66 * 67 * Free all pages associated with DMA buffers, the buffers and pages lists, and 68 * finally the drm_device::dma structure itself. 69 */ 70 void drm_dma_takedown(struct drm_device *dev) 71 { 72 struct drm_device_dma *dma = dev->dma; 73 int i, j; 74 75 if (!dma) 76 return; 77 78 /* Clear dma buffers */ 79 for (i = 0; i <= DRM_MAX_ORDER; i++) { 80 if (dma->bufs[i].seg_count) { 81 DRM_DEBUG("order %d: buf_count = %d," 82 " seg_count = %d\n", 83 i, 84 dma->bufs[i].buf_count, 85 dma->bufs[i].seg_count); 86 for (j = 0; j < dma->bufs[i].seg_count; j++) { 87 if (dma->bufs[i].seglist[j]) { 88 drm_pci_free(dev, dma->bufs[i].seglist[j]); 89 } 90 } 91 kfree(dma->bufs[i].seglist); 92 } 93 if (dma->bufs[i].buf_count) { 94 for (j = 0; j < dma->bufs[i].buf_count; j++) { 95 kfree(dma->bufs[i].buflist[j].dev_private); 96 } 97 kfree(dma->bufs[i].buflist); 98 } 99 } 100 101 kfree(dma->buflist); 102 kfree(dma->pagelist); 103 kfree(dev->dma); 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 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) 126 && waitqueue_active(&buf->dma_wait)) { 127 wake_up_interruptible(&buf->dma_wait); 128 } 129 } 130 131 /** 132 * Reclaim the buffers. 133 * 134 * \param file_priv DRM file private. 135 * 136 * Frees each buffer associated with \p file_priv not already on the hardware. 137 */ 138 void drm_core_reclaim_buffers(struct drm_device *dev, 139 struct drm_file *file_priv) 140 { 141 struct drm_device_dma *dma = dev->dma; 142 int i; 143 144 if (!dma) 145 return; 146 for (i = 0; i < dma->buf_count; i++) { 147 if (dma->buflist[i]->file_priv == file_priv) { 148 switch (dma->buflist[i]->list) { 149 case DRM_LIST_NONE: 150 drm_free_buffer(dev, dma->buflist[i]); 151 break; 152 case DRM_LIST_WAIT: 153 dma->buflist[i]->list = DRM_LIST_RECLAIM; 154 break; 155 default: 156 /* Buffer already on hardware. */ 157 break; 158 } 159 } 160 } 161 } 162 163 EXPORT_SYMBOL(drm_core_reclaim_buffers); 164