drm_dma.c revision 1.1.1.2.4.2
1 1.1.1.2.4.2 tls /** 2 1.1.1.2.4.2 tls * \file drm_dma.c 3 1.1.1.2.4.2 tls * DMA IOCTL and function support 4 1.1.1.2.4.2 tls * 5 1.1.1.2.4.2 tls * \author Rickard E. (Rik) Faith <faith (at) valinux.com> 6 1.1.1.2.4.2 tls * \author Gareth Hughes <gareth (at) valinux.com> 7 1.1.1.2.4.2 tls */ 8 1.1.1.2.4.2 tls 9 1.1.1.2.4.2 tls /* 10 1.1.1.2.4.2 tls * Created: Fri Mar 19 14:30:16 1999 by faith (at) valinux.com 11 1.1.1.2.4.2 tls * 12 1.1.1.2.4.2 tls * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 13 1.1.1.2.4.2 tls * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 14 1.1.1.2.4.2 tls * All Rights Reserved. 15 1.1.1.2.4.2 tls * 16 1.1.1.2.4.2 tls * Permission is hereby granted, free of charge, to any person obtaining a 17 1.1.1.2.4.2 tls * copy of this software and associated documentation files (the "Software"), 18 1.1.1.2.4.2 tls * to deal in the Software without restriction, including without limitation 19 1.1.1.2.4.2 tls * the rights to use, copy, modify, merge, publish, distribute, sublicense, 20 1.1.1.2.4.2 tls * and/or sell copies of the Software, and to permit persons to whom the 21 1.1.1.2.4.2 tls * Software is furnished to do so, subject to the following conditions: 22 1.1.1.2.4.2 tls * 23 1.1.1.2.4.2 tls * The above copyright notice and this permission notice (including the next 24 1.1.1.2.4.2 tls * paragraph) shall be included in all copies or substantial portions of the 25 1.1.1.2.4.2 tls * Software. 26 1.1.1.2.4.2 tls * 27 1.1.1.2.4.2 tls * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 28 1.1.1.2.4.2 tls * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 29 1.1.1.2.4.2 tls * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 30 1.1.1.2.4.2 tls * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 31 1.1.1.2.4.2 tls * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 32 1.1.1.2.4.2 tls * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 33 1.1.1.2.4.2 tls * OTHER DEALINGS IN THE SOFTWARE. 34 1.1.1.2.4.2 tls */ 35 1.1.1.2.4.2 tls 36 1.1.1.2.4.2 tls #include <linux/export.h> 37 1.1.1.2.4.2 tls #include <drm/drmP.h> 38 1.1.1.2.4.2 tls 39 1.1.1.2.4.2 tls /** 40 1.1.1.2.4.2 tls * Initialize the DMA data. 41 1.1.1.2.4.2 tls * 42 1.1.1.2.4.2 tls * \param dev DRM device. 43 1.1.1.2.4.2 tls * \return zero on success or a negative value on failure. 44 1.1.1.2.4.2 tls * 45 1.1.1.2.4.2 tls * Allocate and initialize a drm_device_dma structure. 46 1.1.1.2.4.2 tls */ 47 1.1.1.2.4.2 tls int drm_legacy_dma_setup(struct drm_device *dev) 48 1.1.1.2.4.2 tls { 49 1.1.1.2.4.2 tls int i; 50 1.1.1.2.4.2 tls 51 1.1.1.2.4.2 tls if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 52 1.1.1.2.4.2 tls drm_core_check_feature(dev, DRIVER_MODESET)) { 53 1.1.1.2.4.2 tls return 0; 54 1.1.1.2.4.2 tls } 55 1.1.1.2.4.2 tls 56 1.1.1.2.4.2 tls dev->buf_use = 0; 57 1.1.1.2.4.2 tls atomic_set(&dev->buf_alloc, 0); 58 1.1.1.2.4.2 tls 59 1.1.1.2.4.2 tls dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL); 60 1.1.1.2.4.2 tls if (!dev->dma) 61 1.1.1.2.4.2 tls return -ENOMEM; 62 1.1.1.2.4.2 tls 63 1.1.1.2.4.2 tls for (i = 0; i <= DRM_MAX_ORDER; i++) 64 1.1.1.2.4.2 tls memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); 65 1.1.1.2.4.2 tls 66 1.1.1.2.4.2 tls return 0; 67 1.1.1.2.4.2 tls } 68 1.1.1.2.4.2 tls 69 1.1.1.2.4.2 tls /** 70 1.1.1.2.4.2 tls * Cleanup the DMA resources. 71 1.1.1.2.4.2 tls * 72 1.1.1.2.4.2 tls * \param dev DRM device. 73 1.1.1.2.4.2 tls * 74 1.1.1.2.4.2 tls * Free all pages associated with DMA buffers, the buffers and pages lists, and 75 1.1.1.2.4.2 tls * finally the drm_device::dma structure itself. 76 1.1.1.2.4.2 tls */ 77 1.1.1.2.4.2 tls void drm_legacy_dma_takedown(struct drm_device *dev) 78 1.1.1.2.4.2 tls { 79 1.1.1.2.4.2 tls struct drm_device_dma *dma = dev->dma; 80 1.1.1.2.4.2 tls int i, j; 81 1.1.1.2.4.2 tls 82 1.1.1.2.4.2 tls if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) || 83 1.1.1.2.4.2 tls drm_core_check_feature(dev, DRIVER_MODESET)) { 84 1.1.1.2.4.2 tls return; 85 1.1.1.2.4.2 tls } 86 1.1.1.2.4.2 tls 87 1.1.1.2.4.2 tls if (!dma) 88 1.1.1.2.4.2 tls return; 89 1.1.1.2.4.2 tls 90 1.1.1.2.4.2 tls /* Clear dma buffers */ 91 1.1.1.2.4.2 tls for (i = 0; i <= DRM_MAX_ORDER; i++) { 92 1.1.1.2.4.2 tls if (dma->bufs[i].seg_count) { 93 1.1.1.2.4.2 tls DRM_DEBUG("order %d: buf_count = %d," 94 1.1.1.2.4.2 tls " seg_count = %d\n", 95 1.1.1.2.4.2 tls i, 96 1.1.1.2.4.2 tls dma->bufs[i].buf_count, 97 1.1.1.2.4.2 tls dma->bufs[i].seg_count); 98 1.1.1.2.4.2 tls for (j = 0; j < dma->bufs[i].seg_count; j++) { 99 1.1.1.2.4.2 tls if (dma->bufs[i].seglist[j]) { 100 1.1.1.2.4.2 tls drm_pci_free(dev, dma->bufs[i].seglist[j]); 101 1.1.1.2.4.2 tls } 102 1.1.1.2.4.2 tls } 103 1.1.1.2.4.2 tls kfree(dma->bufs[i].seglist); 104 1.1.1.2.4.2 tls } 105 1.1.1.2.4.2 tls if (dma->bufs[i].buf_count) { 106 1.1.1.2.4.2 tls for (j = 0; j < dma->bufs[i].buf_count; j++) { 107 1.1.1.2.4.2 tls kfree(dma->bufs[i].buflist[j].dev_private); 108 1.1.1.2.4.2 tls } 109 1.1.1.2.4.2 tls kfree(dma->bufs[i].buflist); 110 1.1.1.2.4.2 tls } 111 1.1.1.2.4.2 tls } 112 1.1.1.2.4.2 tls 113 1.1.1.2.4.2 tls kfree(dma->buflist); 114 1.1.1.2.4.2 tls kfree(dma->pagelist); 115 1.1.1.2.4.2 tls kfree(dev->dma); 116 1.1.1.2.4.2 tls dev->dma = NULL; 117 1.1.1.2.4.2 tls } 118 1.1.1.2.4.2 tls 119 1.1.1.2.4.2 tls /** 120 1.1.1.2.4.2 tls * Free a buffer. 121 1.1.1.2.4.2 tls * 122 1.1.1.2.4.2 tls * \param dev DRM device. 123 1.1.1.2.4.2 tls * \param buf buffer to free. 124 1.1.1.2.4.2 tls * 125 1.1.1.2.4.2 tls * Resets the fields of \p buf. 126 1.1.1.2.4.2 tls */ 127 1.1.1.2.4.2 tls void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf) 128 1.1.1.2.4.2 tls { 129 1.1.1.2.4.2 tls if (!buf) 130 1.1.1.2.4.2 tls return; 131 1.1.1.2.4.2 tls 132 1.1.1.2.4.2 tls buf->waiting = 0; 133 1.1.1.2.4.2 tls buf->pending = 0; 134 1.1.1.2.4.2 tls buf->file_priv = NULL; 135 1.1.1.2.4.2 tls buf->used = 0; 136 1.1.1.2.4.2 tls } 137 1.1.1.2.4.2 tls 138 1.1.1.2.4.2 tls /** 139 1.1.1.2.4.2 tls * Reclaim the buffers. 140 1.1.1.2.4.2 tls * 141 1.1.1.2.4.2 tls * \param file_priv DRM file private. 142 1.1.1.2.4.2 tls * 143 1.1.1.2.4.2 tls * Frees each buffer associated with \p file_priv not already on the hardware. 144 1.1.1.2.4.2 tls */ 145 1.1.1.2.4.2 tls void drm_core_reclaim_buffers(struct drm_device *dev, 146 1.1.1.2.4.2 tls struct drm_file *file_priv) 147 1.1.1.2.4.2 tls { 148 1.1.1.2.4.2 tls struct drm_device_dma *dma = dev->dma; 149 1.1.1.2.4.2 tls int i; 150 1.1.1.2.4.2 tls 151 1.1.1.2.4.2 tls if (!dma) 152 1.1.1.2.4.2 tls return; 153 1.1.1.2.4.2 tls for (i = 0; i < dma->buf_count; i++) { 154 1.1.1.2.4.2 tls if (dma->buflist[i]->file_priv == file_priv) { 155 1.1.1.2.4.2 tls switch (dma->buflist[i]->list) { 156 1.1.1.2.4.2 tls case DRM_LIST_NONE: 157 1.1.1.2.4.2 tls drm_free_buffer(dev, dma->buflist[i]); 158 1.1.1.2.4.2 tls break; 159 1.1.1.2.4.2 tls case DRM_LIST_WAIT: 160 1.1.1.2.4.2 tls dma->buflist[i]->list = DRM_LIST_RECLAIM; 161 1.1.1.2.4.2 tls break; 162 1.1.1.2.4.2 tls default: 163 1.1.1.2.4.2 tls /* Buffer already on hardware. */ 164 1.1.1.2.4.2 tls break; 165 1.1.1.2.4.2 tls } 166 1.1.1.2.4.2 tls } 167 1.1.1.2.4.2 tls } 168 1.1.1.2.4.2 tls } 169 1.1.1.2.4.2 tls 170 1.1.1.2.4.2 tls EXPORT_SYMBOL(drm_core_reclaim_buffers); 171
Indexes created Wed Oct 22 13:09:56 GMT 2025