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 38 #include <drm/drm_drv.h> 39 #include <drm/drm_pci.h> 40 #include <drm/drm_print.h> 41 42 #include "drm_legacy.h" 43 44 /** 45 * Initialize the DMA data. 46 * 47 * \param 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 * Cleanup the DMA resources. 75 * 76 * \param 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 int i, j; 85 86 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 87 !drm_core_check_feature(dev, DRIVER_LEGACY)) 88 return; 89 90 if (!dma) 91 return; 92 93 /* Clear dma buffers */ 94 for (i = 0; i <= DRM_MAX_ORDER; i++) { 95 if (dma->bufs[i].seg_count) { 96 DRM_DEBUG("order %d: buf_count = %d," 97 " seg_count = %d\n", 98 i, 99 dma->bufs[i].buf_count, 100 dma->bufs[i].seg_count); 101 for (j = 0; j < dma->bufs[i].seg_count; j++) { 102 if (dma->bufs[i].seglist[j]) { 103 drm_pci_free(dev, dma->bufs[i].seglist[j]); 104 } 105 } 106 kfree(dma->bufs[i].seglist); 107 } 108 if (dma->bufs[i].buf_count) { 109 for (j = 0; j < dma->bufs[i].buf_count; j++) { 110 kfree(dma->bufs[i].buflist[j].dev_private); 111 } 112 kfree(dma->bufs[i].buflist); 113 } 114 } 115 116 kfree(dma->buflist); 117 kfree(dma->pagelist); 118 kfree(dev->dma); 119 dev->dma = NULL; 120 } 121 122 /** 123 * Free a buffer. 124 * 125 * \param dev DRM device. 126 * \param buf buffer to free. 127 * 128 * Resets the fields of \p buf. 129 */ 130 void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf) 131 { 132 if (!buf) 133 return; 134 135 buf->waiting = 0; 136 buf->pending = 0; 137 buf->file_priv = NULL; 138 buf->used = 0; 139 } 140 141 /** 142 * Reclaim the buffers. 143 * 144 * \param file_priv DRM file private. 145 * 146 * Frees each buffer associated with \p file_priv not already on the hardware. 147 */ 148 void drm_legacy_reclaim_buffers(struct drm_device *dev, 149 struct drm_file *file_priv) 150 { 151 struct drm_device_dma *dma = dev->dma; 152 int i; 153 154 if (!dma) 155 return; 156 for (i = 0; i < dma->buf_count; i++) { 157 if (dma->buflist[i]->file_priv == file_priv) { 158 switch (dma->buflist[i]->list) { 159 case DRM_LIST_NONE: 160 drm_legacy_free_buffer(dev, dma->buflist[i]); 161 break; 162 case DRM_LIST_WAIT: 163 dma->buflist[i]->list = DRM_LIST_RECLAIM; 164 break; 165 default: 166 /* Buffer already on hardware. */ 167 break; 168 } 169 } 170 } 171 } 172