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