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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 | /* radeon_mem.c -- Simple agp/fb memory manager for radeon -*- linux-c -*- * * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved. * * The Weather Channel (TM) funded Tungsten Graphics to develop the * initial release of the Radeon 8500 driver under the XFree86 license. * This notice must be preserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * Authors: * Keith Whitwell <keith@tungstengraphics.com> */ #include "radeon.h" #include "drmP.h" #include "drm.h" #include "radeon_drm.h" #include "radeon_drv.h" /* Very simple allocator for agp memory, working on a static range * already mapped into each client's address space. */ static struct mem_block *split_block(struct mem_block *p, int start, int size, int pid ) { /* Maybe cut off the start of an existing block */ if (start > p->start) { struct mem_block *newblock = DRM_MALLOC(sizeof(*newblock)); if (!newblock) goto out; newblock->start = start; newblock->size = p->size - (start - p->start); newblock->pid = 0; newblock->next = p->next; newblock->prev = p; p->next->prev = newblock; p->next = newblock; p->size -= newblock->size; p = newblock; } /* Maybe cut off the end of an existing block */ if (size < p->size) { struct mem_block *newblock = DRM_MALLOC(sizeof(*newblock)); if (!newblock) goto out; newblock->start = start + size; newblock->size = p->size - size; newblock->pid = 0; newblock->next = p->next; newblock->prev = p; p->next->prev = newblock; p->next = newblock; p->size = size; } out: /* Our block is in the middle */ p->pid = pid; return p; } static struct mem_block *alloc_block( struct mem_block *heap, int size, int align2, int pid ) { struct mem_block *p; int mask = (1 << align2)-1; for (p = heap->next ; p != heap ; p = p->next) { int start = (p->start + mask) & ~mask; if (p->pid == 0 && start + size <= p->start + p->size) return split_block( p, start, size, pid ); } return NULL; } static struct mem_block *find_block( struct mem_block *heap, int start ) { struct mem_block *p; for (p = heap->next ; p != heap ; p = p->next) if (p->start == start) return p; return NULL; } static void free_block( struct mem_block *p ) { p->pid = 0; /* Assumes a single contiguous range. Needs a special pid in * 'heap' to stop it being subsumed. */ if (p->next->pid == 0) { struct mem_block *q = p->next; p->size += q->size; p->next = q->next; p->next->prev = p; DRM_FREE(q); } if (p->prev->pid == 0) { struct mem_block *q = p->prev; q->size += p->size; q->next = p->next; q->next->prev = q; DRM_FREE(p); } } /* Initialize. How to check for an uninitialized heap? */ static int init_heap(struct mem_block **heap, int start, int size) { struct mem_block *blocks = DRM_MALLOC(sizeof(*blocks)); if (!blocks) return -ENOMEM; *heap = DRM_MALLOC(sizeof(**heap)); if (!*heap) { DRM_FREE( blocks ); return -ENOMEM; } blocks->start = start; blocks->size = size; blocks->pid = 0; blocks->next = blocks->prev = *heap; memset( *heap, 0, sizeof(**heap) ); (*heap)->pid = -1; (*heap)->next = (*heap)->prev = blocks; return 0; } /* Free all blocks associated with the releasing pid. */ void radeon_mem_release( struct mem_block *heap ) { int pid = DRM_CURRENTPID; struct mem_block *p; if (!heap || !heap->next) return; for (p = heap->next ; p != heap ; p = p->next) { if (p->pid == pid) p->pid = 0; } /* Assumes a single contiguous range. Needs a special pid in * 'heap' to stop it being subsumed. */ for (p = heap->next ; p != heap ; p = p->next) { while (p->pid == 0 && p->next->pid == 0) { struct mem_block *q = p->next; p->size += q->size; p->next = q->next; p->next->prev = p; DRM_FREE(q); } } } /* Shutdown. */ void radeon_mem_takedown( struct mem_block **heap ) { struct mem_block *p; if (!*heap) return; for (p = (*heap)->next ; p != *heap ; ) { struct mem_block *q = p; p = p->next; DRM_FREE(q); } DRM_FREE( *heap ); *heap = 0; } /* IOCTL HANDLERS */ static struct mem_block **get_heap( drm_radeon_private_t *dev_priv, int region ) { switch( region ) { case RADEON_MEM_REGION_AGP: return &dev_priv->agp_heap; case RADEON_MEM_REGION_FB: return &dev_priv->fb_heap; default: return 0; } } int radeon_mem_alloc( DRM_IOCTL_ARGS ) { DRM_DEVICE; drm_radeon_private_t *dev_priv = dev->dev_private; drm_radeon_mem_alloc_t alloc; struct mem_block *block, **heap; if ( !dev_priv ) { DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); return DRM_ERR(EINVAL); } DRM_COPY_FROM_USER_IOCTL( alloc, (drm_radeon_mem_alloc_t *)data, sizeof(alloc) ); heap = get_heap( dev_priv, alloc.region ); if (!heap || !*heap) return DRM_ERR(EFAULT); /* Make things easier on ourselves: all allocations at least * 4k aligned. */ if (alloc.alignment < 12) alloc.alignment = 12; block = alloc_block( *heap, alloc.size, alloc.alignment, DRM_CURRENTPID ); if (!block) return DRM_ERR(ENOMEM); if ( DRM_COPY_TO_USER( alloc.region_offset, &block->start, sizeof(int) ) ) { DRM_ERROR( "copy_to_user\n" ); return DRM_ERR(EFAULT); } return 0; } int radeon_mem_free( DRM_IOCTL_ARGS ) { DRM_DEVICE; drm_radeon_private_t *dev_priv = dev->dev_private; drm_radeon_mem_free_t memfree; struct mem_block *block, **heap; if ( !dev_priv ) { DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); return DRM_ERR(EINVAL); } DRM_COPY_FROM_USER_IOCTL( memfree, (drm_radeon_mem_free_t *)data, sizeof(memfree) ); heap = get_heap( dev_priv, memfree.region ); if (!heap || !*heap) return DRM_ERR(EFAULT); block = find_block( *heap, memfree.region_offset ); if (!block) return DRM_ERR(EFAULT); if (block->pid != DRM_CURRENTPID) return DRM_ERR(EPERM); free_block( block ); return 0; } int radeon_mem_init_heap( DRM_IOCTL_ARGS ) { DRM_DEVICE; drm_radeon_private_t *dev_priv = dev->dev_private; drm_radeon_mem_init_heap_t initheap; struct mem_block **heap; if ( !dev_priv ) { DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ ); return DRM_ERR(EINVAL); } DRM_COPY_FROM_USER_IOCTL( initheap, (drm_radeon_mem_init_heap_t *)data, sizeof(initheap) ); heap = get_heap( dev_priv, initheap.region ); if (!heap) return DRM_ERR(EFAULT); if (*heap) { DRM_ERROR("heap already initialized?"); return DRM_ERR(EFAULT); } return init_heap( heap, initheap.start, initheap.size ); } |