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 * $FreeBSD: head/sys/dev/drm2/drm_dma.c 235783 2012-05-22 11:07:44Z kib $ 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 <drm/drmP.h> 41 42 int drm_dma_setup(struct drm_device *dev) 43 { 44 45 dev->dma = kmalloc(sizeof(*dev->dma), M_DRM, 46 M_WAITOK | M_NULLOK | M_ZERO); 47 if (dev->dma == NULL) 48 return ENOMEM; 49 50 spin_init(&dev->dma_lock, "drmdma_lock"); 51 52 return 0; 53 } 54 55 void drm_dma_takedown(struct drm_device *dev) 56 { 57 drm_device_dma_t *dma = dev->dma; 58 int i, j; 59 60 if (dma == NULL) 61 return; 62 63 /* Clear dma buffers */ 64 for (i = 0; i <= DRM_MAX_ORDER; i++) { 65 if (dma->bufs[i].seg_count) { 66 DRM_DEBUG("order %d: buf_count = %d," 67 " seg_count = %d\n", i, dma->bufs[i].buf_count, 68 dma->bufs[i].seg_count); 69 for (j = 0; j < dma->bufs[i].seg_count; j++) { 70 drm_pci_free(dev, dma->bufs[i].seglist[j]); 71 } 72 drm_free(dma->bufs[i].seglist, M_DRM); 73 } 74 75 if (dma->bufs[i].buf_count) { 76 for (j = 0; j < dma->bufs[i].buf_count; j++) { 77 drm_free(dma->bufs[i].buflist[j].dev_private, 78 M_DRM); 79 } 80 drm_free(dma->bufs[i].buflist, M_DRM); 81 } 82 } 83 84 drm_free(dma->buflist, M_DRM); 85 drm_free(dma->pagelist, M_DRM); 86 drm_free(dev->dma, M_DRM); 87 dev->dma = NULL; 88 spin_uninit(&dev->dma_lock); 89 } 90 91 92 void drm_free_buffer(struct drm_device *dev, drm_buf_t *buf) 93 { 94 if (!buf) 95 return; 96 97 buf->pending = 0; 98 buf->file_priv= NULL; 99 buf->used = 0; 100 } 101 102 void drm_reclaim_buffers(struct drm_device *dev, struct drm_file *file_priv) 103 { 104 drm_device_dma_t *dma = dev->dma; 105 int i; 106 107 if (!dma) 108 return; 109 110 for (i = 0; i < dma->buf_count; i++) { 111 if (dma->buflist[i]->file_priv == file_priv) { 112 switch (dma->buflist[i]->list) { 113 case DRM_LIST_NONE: 114 drm_free_buffer(dev, dma->buflist[i]); 115 break; 116 case DRM_LIST_WAIT: 117 dma->buflist[i]->list = DRM_LIST_RECLAIM; 118 break; 119 default: 120 /* Buffer already on hardware. */ 121 break; 122 } 123 } 124 } 125 } 126 127 /* Call into the driver-specific DMA handler */ 128 int drm_dma(struct drm_device *dev, void *data, struct drm_file *file_priv) 129 { 130 131 if (dev->driver->dma_ioctl) { 132 /* shared code returns -errno */ 133 return -dev->driver->dma_ioctl(dev, data, file_priv); 134 } else { 135 DRM_DEBUG("DMA ioctl on driver with no dma handler\n"); 136 return EINVAL; 137 } 138 } 139