1 /* 2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* BEGIN CSTYLED */ 7 8 /* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*- 9 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com */ 10 /*- 11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 12 * All Rights Reserved. 13 * 14 * Permission is hereby granted, free of charge, to any person obtaining a 15 * copy of this software and associated documentation files (the "Software"), 16 * to deal in the Software without restriction, including without limitation 17 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 18 * and/or sell copies of the Software, and to permit persons to whom the 19 * Software is furnished to do so, subject to the following conditions: 20 * 21 * The above copyright notice and this permission notice (including the next 22 * paragraph) shall be included in all copies or substantial portions of the 23 * Software. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 31 * DEALINGS IN THE SOFTWARE. 32 * 33 * Authors: 34 * Gareth Hughes <gareth@valinux.com> 35 * Eric Anholt <anholt@FreeBSD.org> 36 * 37 */ 38 /* END CSTYLED */ 39 40 #pragma ident "%Z%%M% %I% %E% SMI" 41 42 #include "drmP.h" 43 44 #define DEBUG_SCATTER 0 45 46 void 47 drm_sg_cleanup(drm_sg_mem_t *entry) 48 { 49 if (entry->busaddr) { 50 drm_free(entry->busaddr, 51 entry->pages * sizeof (entry->busaddr), 52 DRM_MEM_PAGES); 53 entry->busaddr = NULL; 54 } 55 if (entry->virtual) { 56 ddi_umem_free(entry->sg_umem_cookie); 57 entry->virtual = NULL; 58 } 59 if (entry) { 60 drm_free(entry, sizeof (drm_sg_mem_t), DRM_MEM_SGLISTS); 61 } 62 63 } 64 65 /*ARGSUSED*/ 66 int 67 drm_sg_alloc(DRM_IOCTL_ARGS) 68 { 69 DRM_DEVICE; 70 drm_scatter_gather_t request; 71 drm_sg_mem_t *entry; 72 unsigned long pages; 73 74 DRM_DEBUG("%s\n", "drm_sg_alloc"); 75 76 if (dev->sg) 77 return (DRM_ERR(EINVAL)); 78 79 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 80 drm_scatter_gather32_t request32; 81 82 DRM_COPY_FROM_USER_IOCTL(request32, 83 (drm_scatter_gather32_t *)data, 84 sizeof (drm_scatter_gather32_t)); 85 request.size = request32.size; 86 request.handle = request32.handle; 87 } else 88 DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data, 89 sizeof (request)); 90 91 entry = drm_alloc(sizeof (*entry), DRM_MEM_SGLISTS); 92 if (!entry) 93 return (DRM_ERR(ENOMEM)); 94 95 pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE; 96 DRM_DEBUG("sg size=%ld pages=%ld\n", request.size, pages); 97 98 entry->pages = pages; 99 100 entry->busaddr = drm_alloc(pages * sizeof (*entry->busaddr), 101 DRM_MEM_PAGES); 102 103 if (!entry->busaddr) { 104 drm_sg_cleanup(entry); 105 return (DRM_ERR(ENOMEM)); 106 } 107 108 (void) memset((void *)entry->busaddr, 0, 109 pages * sizeof (*entry->busaddr)); 110 111 entry->virtual = ddi_umem_alloc((size_t)(pages << PAGE_SHIFT), 112 DDI_UMEM_SLEEP, &entry->sg_umem_cookie); 113 if (!entry->virtual) { 114 drm_sg_cleanup(entry); 115 return (DRM_ERR(ENOMEM)); 116 } 117 118 entry->handle = (unsigned long)entry->virtual; 119 120 DRM_DEBUG("drm_sg_alloc: handle = %08lx\n", entry->handle); 121 DRM_DEBUG("drm_sg_alloc: virtual = %p\n", entry->virtual); 122 123 request.handle = entry->handle; 124 125 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 126 drm_scatter_gather32_t data32; 127 128 data32.size = request.size; 129 data32.handle = request.handle; 130 131 DRM_COPY_TO_USER_IOCTL((drm_scatter_gather32_t *)data, 132 data32, sizeof (drm_scatter_gather32_t)); 133 } else 134 DRM_COPY_TO_USER_IOCTL((drm_scatter_gather_t *)data, 135 request, 136 sizeof (request)); 137 138 DRM_LOCK(); 139 if (dev->sg) { 140 DRM_UNLOCK(); 141 drm_sg_cleanup(entry); 142 return (DRM_ERR(EINVAL)); 143 } 144 dev->sg = entry; 145 DRM_UNLOCK(); 146 147 return (0); 148 } 149 150 /*ARGSUSED*/ 151 int 152 drm_sg_free(DRM_IOCTL_ARGS) 153 { 154 DRM_DEVICE; 155 drm_scatter_gather_t request; 156 drm_sg_mem_t *entry; 157 158 if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) { 159 drm_scatter_gather32_t request32; 160 161 DRM_COPY_FROM_USER_IOCTL(request32, 162 (drm_scatter_gather32_t *)data, 163 sizeof (drm_scatter_gather32_t)); 164 request.size = request32.size; 165 request.handle = request32.handle; 166 } else 167 DRM_COPY_FROM_USER_IOCTL(request, (drm_scatter_gather_t *)data, 168 sizeof (request)); 169 170 DRM_LOCK(); 171 entry = dev->sg; 172 dev->sg = NULL; 173 DRM_UNLOCK(); 174 175 if (!entry || entry->handle != request.handle) 176 return (DRM_ERR(EINVAL)); 177 178 DRM_DEBUG("drm_sg_free: virtual = %p\n", entry->virtual); 179 180 drm_sg_cleanup(entry); 181 182 return (0); 183 } 184