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 #include "drm_legacy.h" 39 40 /** 41 * Initialize the DMA data. 42 * 43 * \param dev DRM device. 44 * \return zero on success or a negative value on failure. 45 * 46 * Allocate and initialize a drm_device_dma structure. 47 */ 48 int drm_legacy_dma_setup(struct drm_device *dev) 49 { 50 int i; 51 52 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 53 !drm_core_check_feature(dev, DRIVER_LEGACY)) 54 return 0; 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_LEGACY)) 84 return; 85 86 if (!dma) 87 return; 88 89 /* Clear dma buffers */ 90 for (i = 0; i <= DRM_MAX_ORDER; i++) { 91 if (dma->bufs[i].seg_count) { 92 DRM_DEBUG("order %d: buf_count = %d," 93 " seg_count = %d\n", 94 i, 95 dma->bufs[i].buf_count, 96 dma->bufs[i].seg_count); 97 for (j = 0; j < dma->bufs[i].seg_count; j++) { 98 if (dma->bufs[i].seglist[j]) { 99 drm_pci_free(dev, dma->bufs[i].seglist[j]); 100 } 101 } 102 kfree(dma->bufs[i].seglist); 103 } 104 if (dma->bufs[i].buf_count) { 105 for (j = 0; j < dma->bufs[i].buf_count; j++) { 106 kfree(dma->bufs[i].buflist[j].dev_private); 107 } 108 kfree(dma->bufs[i].buflist); 109 } 110 } 111 112 kfree(dma->buflist); 113 kfree(dma->pagelist); 114 kfree(dev->dma); 115 dev->dma = NULL; 116 } 117 118 /** 119 * Free a buffer. 120 * 121 * \param dev DRM device. 122 * \param buf buffer to free. 123 * 124 * Resets the fields of \p buf. 125 */ 126 void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf) 127 { 128 if (!buf) 129 return; 130 131 buf->waiting = 0; 132 buf->pending = 0; 133 buf->file_priv = NULL; 134 buf->used = 0; 135 } 136 137 /** 138 * Reclaim the buffers. 139 * 140 * \param file_priv DRM file private. 141 * 142 * Frees each buffer associated with \p file_priv not already on the hardware. 143 */ 144 void drm_legacy_reclaim_buffers(struct drm_device *dev, 145 struct drm_file *file_priv) 146 { 147 struct drm_device_dma *dma = dev->dma; 148 int i; 149 150 if (!dma) 151 return; 152 for (i = 0; i < dma->buf_count; i++) { 153 if (dma->buflist[i]->file_priv == file_priv) { 154 switch (dma->buflist[i]->list) { 155 case DRM_LIST_NONE: 156 drm_legacy_free_buffer(dev, dma->buflist[i]); 157 break; 158 case DRM_LIST_WAIT: 159 dma->buflist[i]->list = DRM_LIST_RECLAIM; 160 break; 161 default: 162 /* Buffer already on hardware. */ 163 break; 164 } 165 } 166 } 167 } 168