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 <linux/export.h> 37 #include <drm/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_legacy_dma_setup(struct drm_device *dev) 48 { 49 int i; 50 51 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 52 drm_core_check_feature(dev, DRIVER_MODESET)) { 53 return 0; 54 } 55 56 dev->buf_use = 0; 57 atomic_set(&dev->buf_alloc, 0); 58 59 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL); 60 if (!dev->dma) 61 return -ENOMEM; 62 63 for (i = 0; i <= DRM_MAX_ORDER; i++) 64 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); 65 66 return 0; 67 } 68 69 /** 70 * Cleanup the DMA resources. 71 * 72 * \param dev DRM device. 73 * 74 * Free all pages associated with DMA buffers, the buffers and pages lists, and 75 * finally the drm_device::dma structure itself. 76 */ 77 void drm_legacy_dma_takedown(struct drm_device *dev) 78 { 79 struct drm_device_dma *dma = dev->dma; 80 int i, j; 81 82 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 83 drm_core_check_feature(dev, DRIVER_MODESET)) { 84 return; 85 } 86 87 if (!dma) 88 return; 89 90 /* Clear dma buffers */ 91 for (i = 0; i <= DRM_MAX_ORDER; i++) { 92 if (dma->bufs[i].seg_count) { 93 DRM_DEBUG("order %d: buf_count = %d," 94 " seg_count = %d\n", 95 i, 96 dma->bufs[i].buf_count, 97 dma->bufs[i].seg_count); 98 for (j = 0; j < dma->bufs[i].seg_count; j++) { 99 if (dma->bufs[i].seglist[j]) { 100 drm_pci_free(dev, dma->bufs[i].seglist[j]); 101 } 102 } 103 kfree(dma->bufs[i].seglist); 104 } 105 if (dma->bufs[i].buf_count) { 106 for (j = 0; j < dma->bufs[i].buf_count; j++) { 107 kfree(dma->bufs[i].buflist[j].dev_private); 108 } 109 kfree(dma->bufs[i].buflist); 110 } 111 } 112 113 kfree(dma->buflist); 114 kfree(dma->pagelist); 115 kfree(dev->dma); 116 dev->dma = NULL; 117 } 118 119 /** 120 * Free a buffer. 121 * 122 * \param dev DRM device. 123 * \param buf buffer to free. 124 * 125 * Resets the fields of \p buf. 126 */ 127 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf) 128 { 129 if (!buf) 130 return; 131 132 buf->waiting = 0; 133 buf->pending = 0; 134 buf->file_priv = NULL; 135 buf->used = 0; 136 } 137 138 /** 139 * Reclaim the buffers. 140 * 141 * \param file_priv DRM file private. 142 * 143 * Frees each buffer associated with \p file_priv not already on the hardware. 144 */ 145 void drm_core_reclaim_buffers(struct drm_device *dev, 146 struct drm_file *file_priv) 147 { 148 struct drm_device_dma *dma = dev->dma; 149 int i; 150 151 if (!dma) 152 return; 153 for (i = 0; i < dma->buf_count; i++) { 154 if (dma->buflist[i]->file_priv == file_priv) { 155 switch (dma->buflist[i]->list) { 156 case DRM_LIST_NONE: 157 drm_free_buffer(dev, dma->buflist[i]); 158 break; 159 case DRM_LIST_WAIT: 160 dma->buflist[i]->list = DRM_LIST_RECLAIM; 161 break; 162 default: 163 /* Buffer already on hardware. */ 164 break; 165 } 166 } 167 } 168 } 169 170 EXPORT_SYMBOL(drm_core_reclaim_buffers); 171