1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 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 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * $FreeBSD: head/sys/dev/drm2/ttm/ttm_memory.c 248663 2013-03-23 20:46:47Z dumbbell $ 27 **************************************************************************/ 28 29 #define pr_fmt(fmt) "[TTM] " fmt 30 31 #include <drm/drmP.h> 32 #include <drm/ttm/ttm_memory.h> 33 #include <drm/ttm/ttm_module.h> 34 #include <drm/ttm/ttm_page_alloc.h> 35 #include <linux/export.h> 36 37 #define TTM_MEMORY_ALLOC_RETRIES 4 38 39 struct ttm_mem_zone { 40 u_int kobj_ref; 41 struct ttm_mem_global *glob; 42 const char *name; 43 uint64_t zone_mem; 44 uint64_t emer_mem; 45 uint64_t max_mem; 46 uint64_t swap_limit; 47 uint64_t used_mem; 48 }; 49 50 static void ttm_mem_zone_kobj_release(struct ttm_mem_zone *zone) 51 { 52 53 pr_info("Zone %7s: Used memory at exit: %llu kiB\n", 54 zone->name, (unsigned long long)zone->used_mem >> 10); 55 kfree(zone); 56 } 57 58 #if 0 59 /* XXXKIB sysctl */ 60 static ssize_t ttm_mem_zone_show(struct ttm_mem_zone *zone; 61 struct attribute *attr, 62 char *buffer) 63 { 64 uint64_t val = 0; 65 66 mtx_lock(&zone->glob->lock); 67 if (attr == &ttm_mem_sys) 68 val = zone->zone_mem; 69 else if (attr == &ttm_mem_emer) 70 val = zone->emer_mem; 71 else if (attr == &ttm_mem_max) 72 val = zone->max_mem; 73 else if (attr == &ttm_mem_swap) 74 val = zone->swap_limit; 75 else if (attr == &ttm_mem_used) 76 val = zone->used_mem; 77 mtx_unlock(&zone->glob->lock); 78 79 return snprintf(buffer, PAGE_SIZE, "%llu\n", 80 (unsigned long long) val >> 10); 81 } 82 #endif 83 84 static void ttm_check_swapping(struct ttm_mem_global *glob); 85 86 #if 0 87 /* XXXKIB sysctl */ 88 static ssize_t ttm_mem_zone_store(struct ttm_mem_zone *zone, 89 struct attribute *attr, 90 const char *buffer, 91 size_t size) 92 { 93 int chars; 94 unsigned long val; 95 uint64_t val64; 96 97 chars = sscanf(buffer, "%lu", &val); 98 if (chars == 0) 99 return size; 100 101 val64 = val; 102 val64 <<= 10; 103 104 mtx_lock(&zone->glob->lock); 105 if (val64 > zone->zone_mem) 106 val64 = zone->zone_mem; 107 if (attr == &ttm_mem_emer) { 108 zone->emer_mem = val64; 109 if (zone->max_mem > val64) 110 zone->max_mem = val64; 111 } else if (attr == &ttm_mem_max) { 112 zone->max_mem = val64; 113 if (zone->emer_mem < val64) 114 zone->emer_mem = val64; 115 } else if (attr == &ttm_mem_swap) 116 zone->swap_limit = val64; 117 mtx_unlock(&zone->glob->lock); 118 119 ttm_check_swapping(zone->glob); 120 121 return size; 122 } 123 #endif 124 125 static void ttm_mem_global_kobj_release(struct ttm_mem_global *glob) 126 { 127 } 128 129 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob, 130 bool from_wq, uint64_t extra) 131 { 132 unsigned int i; 133 struct ttm_mem_zone *zone; 134 uint64_t target; 135 136 for (i = 0; i < glob->num_zones; ++i) { 137 zone = glob->zones[i]; 138 139 if (from_wq) 140 target = zone->swap_limit; 141 else if (priv_check(curthread, PRIV_VM_MLOCK) == 0) 142 target = zone->emer_mem; 143 else 144 target = zone->max_mem; 145 146 target = (extra > target) ? 0ULL : target; 147 148 if (zone->used_mem > target) 149 return true; 150 } 151 return false; 152 } 153 154 /** 155 * At this point we only support a single shrink callback. 156 * Extend this if needed, perhaps using a linked list of callbacks. 157 * Note that this function is reentrant: 158 * many threads may try to swap out at any given time. 159 */ 160 161 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq, 162 uint64_t extra) 163 { 164 int ret; 165 struct ttm_mem_shrink *shrink; 166 167 spin_lock(&glob->spin); 168 if (glob->shrink == NULL) 169 goto out; 170 171 while (ttm_zones_above_swap_target(glob, from_wq, extra)) { 172 shrink = glob->shrink; 173 spin_unlock(&glob->spin); 174 ret = shrink->do_shrink(shrink); 175 spin_lock(&glob->spin); 176 if (unlikely(ret != 0)) 177 goto out; 178 } 179 out: 180 spin_unlock(&glob->spin); 181 } 182 183 184 185 static void ttm_shrink_work(void *arg, int pending __unused) 186 { 187 struct ttm_mem_global *glob = arg; 188 189 ttm_shrink(glob, true, 0ULL); 190 } 191 192 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob, 193 uint64_t mem) 194 { 195 struct ttm_mem_zone *zone; 196 197 zone = kzalloc(sizeof(*zone), GFP_KERNEL); 198 199 zone->name = "kernel"; 200 zone->zone_mem = mem; 201 zone->max_mem = mem >> 1; 202 zone->emer_mem = (mem >> 1) + (mem >> 2); 203 zone->swap_limit = zone->max_mem - (mem >> 3); 204 zone->used_mem = 0; 205 zone->glob = glob; 206 glob->zone_kernel = zone; 207 refcount_init(&zone->kobj_ref, 1); 208 glob->zones[glob->num_zones++] = zone; 209 return 0; 210 } 211 212 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob, 213 uint64_t mem) 214 { 215 struct ttm_mem_zone *zone; 216 217 zone = kzalloc(sizeof(*zone), GFP_KERNEL); 218 219 /** 220 * No special dma32 zone needed. 221 */ 222 223 if ((physmem * PAGE_SIZE) <= ((uint64_t) 1ULL << 32)) { 224 kfree(zone); 225 return 0; 226 } 227 228 /* 229 * Limit max dma32 memory to 4GB for now 230 * until we can figure out how big this 231 * zone really is. 232 */ 233 if (mem > ((uint64_t) 1ULL << 32)) 234 mem = ((uint64_t) 1ULL << 32); 235 236 zone->name = "dma32"; 237 zone->zone_mem = mem; 238 zone->max_mem = mem >> 1; 239 zone->emer_mem = (mem >> 1) + (mem >> 2); 240 zone->swap_limit = zone->max_mem - (mem >> 3); 241 zone->used_mem = 0; 242 zone->glob = glob; 243 glob->zone_dma32 = zone; 244 refcount_init(&zone->kobj_ref, 1); 245 glob->zones[glob->num_zones++] = zone; 246 return 0; 247 } 248 249 int ttm_mem_global_init(struct ttm_mem_global *glob) 250 { 251 u_int64_t mem; 252 int ret; 253 int i; 254 struct ttm_mem_zone *zone; 255 256 spin_init(&glob->spin, "ttmemglob"); 257 glob->swap_queue = taskqueue_create("ttm_swap", M_WAITOK, 258 taskqueue_thread_enqueue, &glob->swap_queue); 259 taskqueue_start_threads(&glob->swap_queue, 1, TDPRI_KERN_DAEMON, 260 -1, "ttm swap"); 261 TASK_INIT(&glob->work, 0, ttm_shrink_work, glob); 262 263 refcount_init(&glob->kobj_ref, 1); 264 265 /* 266 * Managed contiguous memory for TTM. Only use kernel-reserved 267 * dma memory for TTM, which can be controlled via /boot/loader.conf 268 * (e.g. vm.dma_reserved=256m). This is the only truly dependable 269 * DMA memory. 270 */ 271 mem = (uint64_t)vm_contig_avail_pages() * PAGE_SIZE; 272 273 ret = ttm_mem_init_kernel_zone(glob, mem); 274 if (unlikely(ret != 0)) 275 goto out_no_zone; 276 ret = ttm_mem_init_dma32_zone(glob, mem); 277 if (unlikely(ret != 0)) 278 goto out_no_zone; 279 pr_info("(struct ttm_mem_global *)%p\n", glob); 280 for (i = 0; i < glob->num_zones; ++i) { 281 zone = glob->zones[i]; 282 pr_info("Zone %7s: Available graphics memory: %llu kiB\n", 283 zone->name, (unsigned long long)zone->max_mem >> 10); 284 } 285 ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE)); 286 ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE)); 287 return 0; 288 out_no_zone: 289 ttm_mem_global_release(glob); 290 return ret; 291 } 292 EXPORT_SYMBOL(ttm_mem_global_init); 293 294 void ttm_mem_global_release(struct ttm_mem_global *glob) 295 { 296 unsigned int i; 297 struct ttm_mem_zone *zone; 298 299 /* let the page allocator first stop the shrink work. */ 300 ttm_page_alloc_fini(); 301 ttm_dma_page_alloc_fini(); 302 303 taskqueue_drain(glob->swap_queue, &glob->work); 304 taskqueue_free(glob->swap_queue); 305 glob->swap_queue = NULL; 306 for (i = 0; i < glob->num_zones; ++i) { 307 zone = glob->zones[i]; 308 if (refcount_release(&zone->kobj_ref)) 309 ttm_mem_zone_kobj_release(zone); 310 } 311 if (refcount_release(&glob->kobj_ref)) 312 ttm_mem_global_kobj_release(glob); 313 } 314 EXPORT_SYMBOL(ttm_mem_global_release); 315 316 static void ttm_check_swapping(struct ttm_mem_global *glob) 317 { 318 bool needs_swapping = false; 319 unsigned int i; 320 struct ttm_mem_zone *zone; 321 322 spin_lock(&glob->spin); 323 for (i = 0; i < glob->num_zones; ++i) { 324 zone = glob->zones[i]; 325 if (zone->used_mem > zone->swap_limit) { 326 needs_swapping = true; 327 break; 328 } 329 } 330 spin_unlock(&glob->spin); 331 332 if (unlikely(needs_swapping)) 333 taskqueue_enqueue(glob->swap_queue, &glob->work); 334 335 } 336 337 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob, 338 struct ttm_mem_zone *single_zone, 339 uint64_t amount) 340 { 341 unsigned int i; 342 struct ttm_mem_zone *zone; 343 344 spin_lock(&glob->spin); 345 for (i = 0; i < glob->num_zones; ++i) { 346 zone = glob->zones[i]; 347 if (single_zone && zone != single_zone) 348 continue; 349 zone->used_mem -= amount; 350 } 351 spin_unlock(&glob->spin); 352 } 353 354 void ttm_mem_global_free(struct ttm_mem_global *glob, 355 uint64_t amount) 356 { 357 ttm_mem_global_free_zone(glob, NULL, amount); 358 } 359 EXPORT_SYMBOL(ttm_mem_global_free); 360 361 static int ttm_mem_global_reserve(struct ttm_mem_global *glob, 362 struct ttm_mem_zone *single_zone, 363 uint64_t amount, bool reserve) 364 { 365 uint64_t limit; 366 int ret = -ENOMEM; 367 unsigned int i; 368 struct ttm_mem_zone *zone; 369 370 spin_lock(&glob->spin); 371 for (i = 0; i < glob->num_zones; ++i) { 372 zone = glob->zones[i]; 373 if (single_zone && zone != single_zone) 374 continue; 375 376 limit = (priv_check(curthread, PRIV_VM_MLOCK) == 0) ? 377 zone->emer_mem : zone->max_mem; 378 379 if (zone->used_mem > limit) 380 goto out_unlock; 381 } 382 383 if (reserve) { 384 for (i = 0; i < glob->num_zones; ++i) { 385 zone = glob->zones[i]; 386 if (single_zone && zone != single_zone) 387 continue; 388 zone->used_mem += amount; 389 } 390 } 391 392 ret = 0; 393 out_unlock: 394 spin_unlock(&glob->spin); 395 ttm_check_swapping(glob); 396 397 return ret; 398 } 399 400 401 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob, 402 struct ttm_mem_zone *single_zone, 403 uint64_t memory, 404 bool no_wait, bool interruptible) 405 { 406 int count = TTM_MEMORY_ALLOC_RETRIES; 407 408 while (unlikely(ttm_mem_global_reserve(glob, 409 single_zone, 410 memory, true) 411 != 0)) { 412 if (no_wait) 413 return -ENOMEM; 414 if (unlikely(count-- == 0)) 415 return -ENOMEM; 416 ttm_shrink(glob, false, memory + (memory >> 2) + 16); 417 } 418 419 return 0; 420 } 421 422 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, 423 bool no_wait, bool interruptible) 424 { 425 /** 426 * Normal allocations of kernel memory are registered in 427 * all zones. 428 */ 429 430 return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait, 431 interruptible); 432 } 433 EXPORT_SYMBOL(ttm_mem_global_alloc); 434 435 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, 436 struct vm_page *page, 437 bool no_wait, bool interruptible) 438 { 439 440 struct ttm_mem_zone *zone = NULL; 441 442 /** 443 * Page allocations may be registed in a single zone 444 * only if highmem or !dma32. 445 */ 446 447 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) 448 zone = glob->zone_kernel; 449 return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait, 450 interruptible); 451 } 452 453 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct vm_page *page) 454 { 455 struct ttm_mem_zone *zone = NULL; 456 457 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) 458 zone = glob->zone_kernel; 459 ttm_mem_global_free_zone(glob, zone, PAGE_SIZE); 460 } 461 462 463 size_t ttm_round_pot(size_t size) 464 { 465 if ((size & (size - 1)) == 0) 466 return size; 467 else if (size > PAGE_SIZE) 468 return PAGE_ALIGN(size); 469 else { 470 size_t tmp_size = 4; 471 472 while (tmp_size < size) 473 tmp_size <<= 1; 474 475 return tmp_size; 476 } 477 return 0; 478 } 479 EXPORT_SYMBOL(ttm_round_pot); 480