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 <linux/pci.h> 38 39 #include <drm/drm_drv.h> 40 #include <drm/drm_print.h> 41 42 #include "drm_legacy.h" 43 44 /** 45 * drm_legacy_dma_setup() - Initialize the DMA data. 46 * 47 * @dev: DRM device. 48 * Return: zero on success or a negative value on failure. 49 * 50 * Allocate and initialize a drm_device_dma structure. 51 */ 52 int drm_legacy_dma_setup(struct drm_device *dev) 53 { 54 int i; 55 56 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 57 !drm_core_check_feature(dev, DRIVER_LEGACY)) 58 return 0; 59 60 dev->buf_use = 0; 61 atomic_set(&dev->buf_alloc, 0); 62 63 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL); 64 if (!dev->dma) 65 return -ENOMEM; 66 67 for (i = 0; i <= DRM_MAX_ORDER; i++) 68 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); 69 70 return 0; 71 } 72 73 /** 74 * drm_legacy_dma_takedown() - Cleanup the DMA resources. 75 * 76 * @dev: DRM device. 77 * 78 * Free all pages associated with DMA buffers, the buffers and pages lists, and 79 * finally the drm_device::dma structure itself. 80 */ 81 void drm_legacy_dma_takedown(struct drm_device *dev) 82 { 83 struct drm_device_dma *dma = dev->dma; 84 drm_dma_handle_t *dmah; 85 int i, j; 86 87 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 88 !drm_core_check_feature(dev, DRIVER_LEGACY)) 89 return; 90 91 if (!dma) 92 return; 93 94 /* Clear dma buffers */ 95 for (i = 0; i <= DRM_MAX_ORDER; i++) { 96 if (dma->bufs[i].seg_count) { 97 DRM_DEBUG("order %d: buf_count = %d," 98 " seg_count = %d\n", 99 i, 100 dma->bufs[i].buf_count, 101 dma->bufs[i].seg_count); 102 for (j = 0; j < dma->bufs[i].seg_count; j++) { 103 if (dma->bufs[i].seglist[j]) { 104 dmah = dma->bufs[i].seglist[j]; 105 dma_free_coherent(dev->dev, 106 dmah->size, 107 dmah->vaddr, 108 dmah->busaddr); 109 kfree(dmah); 110 } 111 } 112 kfree(dma->bufs[i].seglist); 113 } 114 if (dma->bufs[i].buf_count) { 115 for (j = 0; j < dma->bufs[i].buf_count; j++) { 116 kfree(dma->bufs[i].buflist[j].dev_private); 117 } 118 kfree(dma->bufs[i].buflist); 119 } 120 } 121 122 kfree(dma->buflist); 123 kfree(dma->pagelist); 124 kfree(dev->dma); 125 dev->dma = NULL; 126 } 127 128 /** 129 * drm_legacy_free_buffer() - Free a buffer. 130 * 131 * @dev: DRM device. 132 * @buf: buffer to free. 133 * 134 * Resets the fields of \p buf. 135 */ 136 void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf) 137 { 138 if (!buf) 139 return; 140 141 buf->waiting = 0; 142 buf->pending = 0; 143 buf->file_priv = NULL; 144 buf->used = 0; 145 } 146 147 /** 148 * drm_legacy_reclaim_buffers() - Reclaim the buffers. 149 * 150 * @dev: DRM device. 151 * @file_priv: DRM file private. 152 * 153 * Frees each buffer associated with \p file_priv not already on the hardware. 154 */ 155 void drm_legacy_reclaim_buffers(struct drm_device *dev, 156 struct drm_file *file_priv) 157 { 158 struct drm_device_dma *dma = dev->dma; 159 int i; 160 161 if (!dma) 162 return; 163 for (i = 0; i < dma->buf_count; i++) { 164 if (dma->buflist[i]->file_priv == file_priv) { 165 switch (dma->buflist[i]->list) { 166 case DRM_LIST_NONE: 167 drm_legacy_free_buffer(dev, dma->buflist[i]); 168 break; 169 case DRM_LIST_WAIT: 170 dma->buflist[i]->list = DRM_LIST_RECLAIM; 171 break; 172 default: 173 /* Buffer already on hardware. */ 174 break; 175 } 176 } 177 } 178 } 179