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