1 /*- 2 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 * 25 * Authors: 26 * Rickard E. (Rik) Faith <faith@valinux.com> 27 * Gareth Hughes <gareth@valinux.com> 28 * 29 * $DragonFly: src/sys/dev/drm/drm_dma.c,v 1.1 2008/04/05 18:12:29 hasso Exp $ 30 */ 31 32 /** @file drm_dma.c 33 * Support code for DMA buffer management. 34 * 35 * The implementation used to be significantly more complicated, but the 36 * complexity has been moved into the drivers as different buffer management 37 * schemes evolved. 38 */ 39 40 #include "drmP.h" 41 42 int drm_dma_setup(drm_device_t *dev) 43 { 44 45 dev->dma = malloc(sizeof(*dev->dma), M_DRM, M_NOWAIT | M_ZERO); 46 if (dev->dma == NULL) 47 return ENOMEM; 48 49 DRM_SPININIT(&dev->dma_lock, "drmdma"); 50 51 return 0; 52 } 53 54 void drm_dma_takedown(drm_device_t *dev) 55 { 56 drm_device_dma_t *dma = dev->dma; 57 int i, j; 58 59 if (dma == NULL) 60 return; 61 62 /* Clear dma buffers */ 63 for (i = 0; i <= DRM_MAX_ORDER; i++) { 64 if (dma->bufs[i].seg_count) { 65 DRM_DEBUG("order %d: buf_count = %d," 66 " seg_count = %d\n", 67 i, 68 dma->bufs[i].buf_count, 69 dma->bufs[i].seg_count); 70 for (j = 0; j < dma->bufs[i].seg_count; j++) { 71 drm_pci_free(dev, dma->bufs[i].seglist[j]); 72 } 73 free(dma->bufs[i].seglist, M_DRM); 74 } 75 76 if (dma->bufs[i].buf_count) { 77 for (j = 0; j < dma->bufs[i].buf_count; j++) { 78 free(dma->bufs[i].buflist[j].dev_private, 79 M_DRM); 80 } 81 free(dma->bufs[i].buflist, M_DRM); 82 } 83 } 84 85 free(dma->buflist, M_DRM); 86 free(dma->pagelist, M_DRM); 87 free(dev->dma, M_DRM); 88 dev->dma = NULL; 89 DRM_SPINUNINIT(&dev->dma_lock); 90 } 91 92 93 void drm_free_buffer(drm_device_t *dev, drm_buf_t *buf) 94 { 95 if (!buf) return; 96 97 buf->pending = 0; 98 buf->file_priv= NULL; 99 buf->used = 0; 100 } 101 102 void drm_reclaim_buffers(drm_device_t *dev, struct drm_file *file_priv) 103 { 104 drm_device_dma_t *dma = dev->dma; 105 int i; 106 107 if (!dma) return; 108 for (i = 0; i < dma->buf_count; i++) { 109 if (dma->buflist[i]->file_priv == file_priv) { 110 switch (dma->buflist[i]->list) { 111 case DRM_LIST_NONE: 112 drm_free_buffer(dev, dma->buflist[i]); 113 break; 114 case DRM_LIST_WAIT: 115 dma->buflist[i]->list = DRM_LIST_RECLAIM; 116 break; 117 default: 118 /* Buffer already on hardware. */ 119 break; 120 } 121 } 122 } 123 } 124 125 /* Call into the driver-specific DMA handler */ 126 int drm_dma(drm_device_t *dev, void *data, struct drm_file *file_priv) 127 { 128 129 if (dev->driver.dma_ioctl) { 130 /* shared code returns -errno */ 131 return -dev->driver.dma_ioctl(dev, data, file_priv); 132 } else { 133 DRM_DEBUG("DMA ioctl on driver with no dma handler\n"); 134 return EINVAL; 135 } 136 } 137