Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) Red Hat Inc. |
| 3 | |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sub license, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice (including the |
| 12 | * next paragraph) shall be included in all copies or substantial portions |
| 13 | * of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 21 | * DEALINGS IN THE SOFTWARE. |
| 22 | * |
| 23 | * Authors: Dave Airlie <airlied@redhat.com> |
| 24 | * Jerome Glisse <jglisse@redhat.com> |
| 25 | * Pauli Nieminen <suokkos@gmail.com> |
| 26 | */ |
| 27 | |
| 28 | /* simple list based uncached page pool |
| 29 | * - Pool collects resently freed pages for reuse |
| 30 | * - Use page->lru to keep a free list |
| 31 | * - doesn't track currently in use pages |
| 32 | */ |
| 33 | #include <linux/list.h> |
| 34 | #include <linux/spinlock.h> |
| 35 | #include <linux/highmem.h> |
| 36 | #include <linux/mm_types.h> |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 37 | #include <linux/module.h> |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 38 | #include <linux/mm.h> |
Matt Turner | 4cdc840 | 2010-04-07 22:42:04 +0000 | [diff] [blame] | 39 | #include <linux/seq_file.h> /* for seq_printf */ |
Stephen Rothwell | 2125b8a | 2010-04-08 13:42:03 +1000 | [diff] [blame] | 40 | #include <linux/slab.h> |
Konrad Rzeszutek Wilk | f9820a4 | 2010-11-29 13:52:18 -0500 | [diff] [blame] | 41 | #include <linux/dma-mapping.h> |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 42 | |
| 43 | #include <asm/atomic.h> |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 44 | |
| 45 | #include "ttm/ttm_bo_driver.h" |
| 46 | #include "ttm/ttm_page_alloc.h" |
| 47 | |
Luck, Tony | d667865 | 2010-07-21 10:15:39 -0700 | [diff] [blame] | 48 | #ifdef TTM_HAS_AGP |
| 49 | #include <asm/agp.h> |
| 50 | #endif |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 51 | |
| 52 | #define NUM_PAGES_TO_ALLOC (PAGE_SIZE/sizeof(struct page *)) |
| 53 | #define SMALL_ALLOCATION 16 |
| 54 | #define FREE_ALL_PAGES (~0U) |
| 55 | /* times are in msecs */ |
| 56 | #define PAGE_FREE_INTERVAL 1000 |
| 57 | |
| 58 | /** |
| 59 | * struct ttm_page_pool - Pool to reuse recently allocated uc/wc pages. |
| 60 | * |
| 61 | * @lock: Protects the shared pool from concurrnet access. Must be used with |
| 62 | * irqsave/irqrestore variants because pool allocator maybe called from |
| 63 | * delayed work. |
| 64 | * @fill_lock: Prevent concurrent calls to fill. |
| 65 | * @list: Pool of free uc/wc pages for fast reuse. |
| 66 | * @gfp_flags: Flags to pass for alloc_page. |
| 67 | * @npages: Number of pages in pool. |
| 68 | */ |
| 69 | struct ttm_page_pool { |
| 70 | spinlock_t lock; |
| 71 | bool fill_lock; |
| 72 | struct list_head list; |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 73 | gfp_t gfp_flags; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 74 | unsigned npages; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 75 | char *name; |
| 76 | unsigned long nfrees; |
| 77 | unsigned long nrefills; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 78 | }; |
| 79 | |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 80 | /** |
| 81 | * Limits for the pool. They are handled without locks because only place where |
| 82 | * they may change is in sysfs store. They won't have immediate effect anyway |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 83 | * so forcing serialization to access them is pointless. |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 84 | */ |
| 85 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 86 | struct ttm_pool_opts { |
| 87 | unsigned alloc_size; |
| 88 | unsigned max_size; |
| 89 | unsigned small; |
| 90 | }; |
| 91 | |
| 92 | #define NUM_POOLS 4 |
| 93 | |
| 94 | /** |
| 95 | * struct ttm_pool_manager - Holds memory pools for fst allocation |
| 96 | * |
| 97 | * Manager is read only object for pool code so it doesn't need locking. |
| 98 | * |
| 99 | * @free_interval: minimum number of jiffies between freeing pages from pool. |
| 100 | * @page_alloc_inited: reference counting for pool allocation. |
| 101 | * @work: Work that is used to shrink the pool. Work is only run when there is |
| 102 | * some pages to free. |
| 103 | * @small_allocation: Limit in number of pages what is small allocation. |
| 104 | * |
| 105 | * @pools: All pool objects in use. |
| 106 | **/ |
| 107 | struct ttm_pool_manager { |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 108 | struct kobject kobj; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 109 | struct shrinker mm_shrink; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 110 | struct ttm_pool_opts options; |
| 111 | |
| 112 | union { |
| 113 | struct ttm_page_pool pools[NUM_POOLS]; |
| 114 | struct { |
| 115 | struct ttm_page_pool wc_pool; |
| 116 | struct ttm_page_pool uc_pool; |
| 117 | struct ttm_page_pool wc_pool_dma32; |
| 118 | struct ttm_page_pool uc_pool_dma32; |
| 119 | } ; |
| 120 | }; |
| 121 | }; |
| 122 | |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 123 | static struct attribute ttm_page_pool_max = { |
| 124 | .name = "pool_max_size", |
| 125 | .mode = S_IRUGO | S_IWUSR |
| 126 | }; |
| 127 | static struct attribute ttm_page_pool_small = { |
| 128 | .name = "pool_small_allocation", |
| 129 | .mode = S_IRUGO | S_IWUSR |
| 130 | }; |
| 131 | static struct attribute ttm_page_pool_alloc_size = { |
| 132 | .name = "pool_allocation_size", |
| 133 | .mode = S_IRUGO | S_IWUSR |
| 134 | }; |
| 135 | |
| 136 | static struct attribute *ttm_pool_attrs[] = { |
| 137 | &ttm_page_pool_max, |
| 138 | &ttm_page_pool_small, |
| 139 | &ttm_page_pool_alloc_size, |
| 140 | NULL |
| 141 | }; |
| 142 | |
| 143 | static void ttm_pool_kobj_release(struct kobject *kobj) |
| 144 | { |
| 145 | struct ttm_pool_manager *m = |
| 146 | container_of(kobj, struct ttm_pool_manager, kobj); |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 147 | kfree(m); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | static ssize_t ttm_pool_store(struct kobject *kobj, |
| 151 | struct attribute *attr, const char *buffer, size_t size) |
| 152 | { |
| 153 | struct ttm_pool_manager *m = |
| 154 | container_of(kobj, struct ttm_pool_manager, kobj); |
| 155 | int chars; |
| 156 | unsigned val; |
| 157 | chars = sscanf(buffer, "%u", &val); |
| 158 | if (chars == 0) |
| 159 | return size; |
| 160 | |
| 161 | /* Convert kb to number of pages */ |
| 162 | val = val / (PAGE_SIZE >> 10); |
| 163 | |
| 164 | if (attr == &ttm_page_pool_max) |
| 165 | m->options.max_size = val; |
| 166 | else if (attr == &ttm_page_pool_small) |
| 167 | m->options.small = val; |
| 168 | else if (attr == &ttm_page_pool_alloc_size) { |
| 169 | if (val > NUM_PAGES_TO_ALLOC*8) { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 170 | printk(KERN_ERR TTM_PFX |
| 171 | "Setting allocation size to %lu " |
| 172 | "is not allowed. Recommended size is " |
| 173 | "%lu\n", |
| 174 | NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 7), |
| 175 | NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 10)); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 176 | return size; |
| 177 | } else if (val > NUM_PAGES_TO_ALLOC) { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 178 | printk(KERN_WARNING TTM_PFX |
| 179 | "Setting allocation size to " |
| 180 | "larger than %lu is not recommended.\n", |
| 181 | NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 10)); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 182 | } |
| 183 | m->options.alloc_size = val; |
| 184 | } |
| 185 | |
| 186 | return size; |
| 187 | } |
| 188 | |
| 189 | static ssize_t ttm_pool_show(struct kobject *kobj, |
| 190 | struct attribute *attr, char *buffer) |
| 191 | { |
| 192 | struct ttm_pool_manager *m = |
| 193 | container_of(kobj, struct ttm_pool_manager, kobj); |
| 194 | unsigned val = 0; |
| 195 | |
| 196 | if (attr == &ttm_page_pool_max) |
| 197 | val = m->options.max_size; |
| 198 | else if (attr == &ttm_page_pool_small) |
| 199 | val = m->options.small; |
| 200 | else if (attr == &ttm_page_pool_alloc_size) |
| 201 | val = m->options.alloc_size; |
| 202 | |
| 203 | val = val * (PAGE_SIZE >> 10); |
| 204 | |
| 205 | return snprintf(buffer, PAGE_SIZE, "%u\n", val); |
| 206 | } |
| 207 | |
| 208 | static const struct sysfs_ops ttm_pool_sysfs_ops = { |
| 209 | .show = &ttm_pool_show, |
| 210 | .store = &ttm_pool_store, |
| 211 | }; |
| 212 | |
| 213 | static struct kobj_type ttm_pool_kobj_type = { |
| 214 | .release = &ttm_pool_kobj_release, |
| 215 | .sysfs_ops = &ttm_pool_sysfs_ops, |
| 216 | .default_attrs = ttm_pool_attrs, |
| 217 | }; |
| 218 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 219 | static struct ttm_pool_manager *_manager; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 220 | |
Pauli Nieminen | 975efdb | 2010-04-01 12:45:02 +0000 | [diff] [blame] | 221 | #ifndef CONFIG_X86 |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 222 | static int set_pages_array_wb(struct page **pages, int addrinarray) |
| 223 | { |
| 224 | #ifdef TTM_HAS_AGP |
| 225 | int i; |
| 226 | |
| 227 | for (i = 0; i < addrinarray; i++) |
| 228 | unmap_page_from_agp(pages[i]); |
| 229 | #endif |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static int set_pages_array_wc(struct page **pages, int addrinarray) |
| 234 | { |
| 235 | #ifdef TTM_HAS_AGP |
| 236 | int i; |
| 237 | |
| 238 | for (i = 0; i < addrinarray; i++) |
| 239 | map_page_into_agp(pages[i]); |
| 240 | #endif |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | static int set_pages_array_uc(struct page **pages, int addrinarray) |
| 245 | { |
| 246 | #ifdef TTM_HAS_AGP |
| 247 | int i; |
| 248 | |
| 249 | for (i = 0; i < addrinarray; i++) |
| 250 | map_page_into_agp(pages[i]); |
| 251 | #endif |
| 252 | return 0; |
| 253 | } |
| 254 | #endif |
| 255 | |
| 256 | /** |
| 257 | * Select the right pool or requested caching state and ttm flags. */ |
| 258 | static struct ttm_page_pool *ttm_get_pool(int flags, |
| 259 | enum ttm_caching_state cstate) |
| 260 | { |
| 261 | int pool_index; |
| 262 | |
| 263 | if (cstate == tt_cached) |
| 264 | return NULL; |
| 265 | |
| 266 | if (cstate == tt_wc) |
| 267 | pool_index = 0x0; |
| 268 | else |
| 269 | pool_index = 0x1; |
| 270 | |
| 271 | if (flags & TTM_PAGE_FLAG_DMA32) |
| 272 | pool_index |= 0x2; |
| 273 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 274 | return &_manager->pools[pool_index]; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | /* set memory back to wb and free the pages. */ |
| 278 | static void ttm_pages_put(struct page *pages[], unsigned npages) |
| 279 | { |
| 280 | unsigned i; |
| 281 | if (set_pages_array_wb(pages, npages)) |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 282 | printk(KERN_ERR TTM_PFX "Failed to set %d pages to wb!\n", |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 283 | npages); |
| 284 | for (i = 0; i < npages; ++i) |
| 285 | __free_page(pages[i]); |
| 286 | } |
| 287 | |
| 288 | static void ttm_pool_update_free_locked(struct ttm_page_pool *pool, |
| 289 | unsigned freed_pages) |
| 290 | { |
| 291 | pool->npages -= freed_pages; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 292 | pool->nfrees += freed_pages; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Free pages from pool. |
| 297 | * |
| 298 | * To prevent hogging the ttm_swap process we only free NUM_PAGES_TO_ALLOC |
| 299 | * number of pages in one go. |
| 300 | * |
| 301 | * @pool: to free the pages from |
| 302 | * @free_all: If set to true will free all pages in pool |
| 303 | **/ |
| 304 | static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free) |
| 305 | { |
| 306 | unsigned long irq_flags; |
| 307 | struct page *p; |
| 308 | struct page **pages_to_free; |
| 309 | unsigned freed_pages = 0, |
| 310 | npages_to_free = nr_free; |
| 311 | |
| 312 | if (NUM_PAGES_TO_ALLOC < nr_free) |
| 313 | npages_to_free = NUM_PAGES_TO_ALLOC; |
| 314 | |
| 315 | pages_to_free = kmalloc(npages_to_free * sizeof(struct page *), |
| 316 | GFP_KERNEL); |
| 317 | if (!pages_to_free) { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 318 | printk(KERN_ERR TTM_PFX |
| 319 | "Failed to allocate memory for pool free operation.\n"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | restart: |
| 324 | spin_lock_irqsave(&pool->lock, irq_flags); |
| 325 | |
| 326 | list_for_each_entry_reverse(p, &pool->list, lru) { |
| 327 | if (freed_pages >= npages_to_free) |
| 328 | break; |
| 329 | |
| 330 | pages_to_free[freed_pages++] = p; |
| 331 | /* We can only remove NUM_PAGES_TO_ALLOC at a time. */ |
| 332 | if (freed_pages >= NUM_PAGES_TO_ALLOC) { |
| 333 | /* remove range of pages from the pool */ |
| 334 | __list_del(p->lru.prev, &pool->list); |
| 335 | |
| 336 | ttm_pool_update_free_locked(pool, freed_pages); |
| 337 | /** |
| 338 | * Because changing page caching is costly |
| 339 | * we unlock the pool to prevent stalling. |
| 340 | */ |
| 341 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 342 | |
| 343 | ttm_pages_put(pages_to_free, freed_pages); |
| 344 | if (likely(nr_free != FREE_ALL_PAGES)) |
| 345 | nr_free -= freed_pages; |
| 346 | |
| 347 | if (NUM_PAGES_TO_ALLOC >= nr_free) |
| 348 | npages_to_free = nr_free; |
| 349 | else |
| 350 | npages_to_free = NUM_PAGES_TO_ALLOC; |
| 351 | |
| 352 | freed_pages = 0; |
| 353 | |
| 354 | /* free all so restart the processing */ |
| 355 | if (nr_free) |
| 356 | goto restart; |
| 357 | |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame^] | 358 | /* Not allowed to fall through or break because |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 359 | * following context is inside spinlock while we are |
| 360 | * outside here. |
| 361 | */ |
| 362 | goto out; |
| 363 | |
| 364 | } |
| 365 | } |
| 366 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 367 | /* remove range of pages from the pool */ |
| 368 | if (freed_pages) { |
| 369 | __list_del(&p->lru, &pool->list); |
| 370 | |
| 371 | ttm_pool_update_free_locked(pool, freed_pages); |
| 372 | nr_free -= freed_pages; |
| 373 | } |
| 374 | |
| 375 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 376 | |
| 377 | if (freed_pages) |
| 378 | ttm_pages_put(pages_to_free, freed_pages); |
| 379 | out: |
| 380 | kfree(pages_to_free); |
| 381 | return nr_free; |
| 382 | } |
| 383 | |
| 384 | /* Get good estimation how many pages are free in pools */ |
| 385 | static int ttm_pool_get_num_unused_pages(void) |
| 386 | { |
| 387 | unsigned i; |
| 388 | int total = 0; |
| 389 | for (i = 0; i < NUM_POOLS; ++i) |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 390 | total += _manager->pools[i].npages; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 391 | |
| 392 | return total; |
| 393 | } |
| 394 | |
| 395 | /** |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 396 | * Callback for mm to request pool to reduce number of page held. |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 397 | */ |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 398 | static int ttm_pool_mm_shrink(struct shrinker *shrink, |
| 399 | struct shrink_control *sc) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 400 | { |
| 401 | static atomic_t start_pool = ATOMIC_INIT(0); |
| 402 | unsigned i; |
| 403 | unsigned pool_offset = atomic_add_return(1, &start_pool); |
| 404 | struct ttm_page_pool *pool; |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 405 | int shrink_pages = sc->nr_to_scan; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 406 | |
| 407 | pool_offset = pool_offset % NUM_POOLS; |
| 408 | /* select start pool in round robin fashion */ |
| 409 | for (i = 0; i < NUM_POOLS; ++i) { |
| 410 | unsigned nr_free = shrink_pages; |
| 411 | if (shrink_pages == 0) |
| 412 | break; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 413 | pool = &_manager->pools[(i + pool_offset)%NUM_POOLS]; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 414 | shrink_pages = ttm_page_pool_free(pool, nr_free); |
| 415 | } |
| 416 | /* return estimated number of unused pages in pool */ |
| 417 | return ttm_pool_get_num_unused_pages(); |
| 418 | } |
| 419 | |
| 420 | static void ttm_pool_mm_shrink_init(struct ttm_pool_manager *manager) |
| 421 | { |
| 422 | manager->mm_shrink.shrink = &ttm_pool_mm_shrink; |
| 423 | manager->mm_shrink.seeks = 1; |
| 424 | register_shrinker(&manager->mm_shrink); |
| 425 | } |
| 426 | |
| 427 | static void ttm_pool_mm_shrink_fini(struct ttm_pool_manager *manager) |
| 428 | { |
| 429 | unregister_shrinker(&manager->mm_shrink); |
| 430 | } |
| 431 | |
| 432 | static int ttm_set_pages_caching(struct page **pages, |
| 433 | enum ttm_caching_state cstate, unsigned cpages) |
| 434 | { |
| 435 | int r = 0; |
| 436 | /* Set page caching */ |
| 437 | switch (cstate) { |
| 438 | case tt_uncached: |
| 439 | r = set_pages_array_uc(pages, cpages); |
| 440 | if (r) |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 441 | printk(KERN_ERR TTM_PFX |
| 442 | "Failed to set %d pages to uc!\n", |
| 443 | cpages); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 444 | break; |
| 445 | case tt_wc: |
| 446 | r = set_pages_array_wc(pages, cpages); |
| 447 | if (r) |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 448 | printk(KERN_ERR TTM_PFX |
| 449 | "Failed to set %d pages to wc!\n", |
| 450 | cpages); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 451 | break; |
| 452 | default: |
| 453 | break; |
| 454 | } |
| 455 | return r; |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * Free pages the pages that failed to change the caching state. If there is |
| 460 | * any pages that have changed their caching state already put them to the |
| 461 | * pool. |
| 462 | */ |
| 463 | static void ttm_handle_caching_state_failure(struct list_head *pages, |
| 464 | int ttm_flags, enum ttm_caching_state cstate, |
| 465 | struct page **failed_pages, unsigned cpages) |
| 466 | { |
| 467 | unsigned i; |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 468 | /* Failed pages have to be freed */ |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 469 | for (i = 0; i < cpages; ++i) { |
| 470 | list_del(&failed_pages[i]->lru); |
| 471 | __free_page(failed_pages[i]); |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | /** |
| 476 | * Allocate new pages with correct caching. |
| 477 | * |
| 478 | * This function is reentrant if caller updates count depending on number of |
| 479 | * pages returned in pages array. |
| 480 | */ |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 481 | static int ttm_alloc_new_pages(struct list_head *pages, gfp_t gfp_flags, |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 482 | int ttm_flags, enum ttm_caching_state cstate, unsigned count) |
| 483 | { |
| 484 | struct page **caching_array; |
| 485 | struct page *p; |
| 486 | int r = 0; |
| 487 | unsigned i, cpages; |
| 488 | unsigned max_cpages = min(count, |
| 489 | (unsigned)(PAGE_SIZE/sizeof(struct page *))); |
| 490 | |
| 491 | /* allocate array for page caching change */ |
| 492 | caching_array = kmalloc(max_cpages*sizeof(struct page *), GFP_KERNEL); |
| 493 | |
| 494 | if (!caching_array) { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 495 | printk(KERN_ERR TTM_PFX |
| 496 | "Unable to allocate table for new pages."); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 497 | return -ENOMEM; |
| 498 | } |
| 499 | |
| 500 | for (i = 0, cpages = 0; i < count; ++i) { |
| 501 | p = alloc_page(gfp_flags); |
| 502 | |
| 503 | if (!p) { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 504 | printk(KERN_ERR TTM_PFX "Unable to get page %u.\n", i); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 505 | |
| 506 | /* store already allocated pages in the pool after |
| 507 | * setting the caching state */ |
| 508 | if (cpages) { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 509 | r = ttm_set_pages_caching(caching_array, |
| 510 | cstate, cpages); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 511 | if (r) |
| 512 | ttm_handle_caching_state_failure(pages, |
| 513 | ttm_flags, cstate, |
| 514 | caching_array, cpages); |
| 515 | } |
| 516 | r = -ENOMEM; |
| 517 | goto out; |
| 518 | } |
| 519 | |
| 520 | #ifdef CONFIG_HIGHMEM |
| 521 | /* gfp flags of highmem page should never be dma32 so we |
| 522 | * we should be fine in such case |
| 523 | */ |
| 524 | if (!PageHighMem(p)) |
| 525 | #endif |
| 526 | { |
| 527 | caching_array[cpages++] = p; |
| 528 | if (cpages == max_cpages) { |
| 529 | |
| 530 | r = ttm_set_pages_caching(caching_array, |
| 531 | cstate, cpages); |
| 532 | if (r) { |
| 533 | ttm_handle_caching_state_failure(pages, |
| 534 | ttm_flags, cstate, |
| 535 | caching_array, cpages); |
| 536 | goto out; |
| 537 | } |
| 538 | cpages = 0; |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | list_add(&p->lru, pages); |
| 543 | } |
| 544 | |
| 545 | if (cpages) { |
| 546 | r = ttm_set_pages_caching(caching_array, cstate, cpages); |
| 547 | if (r) |
| 548 | ttm_handle_caching_state_failure(pages, |
| 549 | ttm_flags, cstate, |
| 550 | caching_array, cpages); |
| 551 | } |
| 552 | out: |
| 553 | kfree(caching_array); |
| 554 | |
| 555 | return r; |
| 556 | } |
| 557 | |
| 558 | /** |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame^] | 559 | * Fill the given pool if there aren't enough pages and the requested number of |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 560 | * pages is small. |
| 561 | */ |
| 562 | static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool, |
| 563 | int ttm_flags, enum ttm_caching_state cstate, unsigned count, |
| 564 | unsigned long *irq_flags) |
| 565 | { |
| 566 | struct page *p; |
| 567 | int r; |
| 568 | unsigned cpages = 0; |
| 569 | /** |
| 570 | * Only allow one pool fill operation at a time. |
| 571 | * If pool doesn't have enough pages for the allocation new pages are |
| 572 | * allocated from outside of pool. |
| 573 | */ |
| 574 | if (pool->fill_lock) |
| 575 | return; |
| 576 | |
| 577 | pool->fill_lock = true; |
| 578 | |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame^] | 579 | /* If allocation request is small and there are not enough |
| 580 | * pages in a pool we fill the pool up first. */ |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 581 | if (count < _manager->options.small |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 582 | && count > pool->npages) { |
| 583 | struct list_head new_pages; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 584 | unsigned alloc_size = _manager->options.alloc_size; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 585 | |
| 586 | /** |
| 587 | * Can't change page caching if in irqsave context. We have to |
| 588 | * drop the pool->lock. |
| 589 | */ |
| 590 | spin_unlock_irqrestore(&pool->lock, *irq_flags); |
| 591 | |
| 592 | INIT_LIST_HEAD(&new_pages); |
| 593 | r = ttm_alloc_new_pages(&new_pages, pool->gfp_flags, ttm_flags, |
| 594 | cstate, alloc_size); |
| 595 | spin_lock_irqsave(&pool->lock, *irq_flags); |
| 596 | |
| 597 | if (!r) { |
| 598 | list_splice(&new_pages, &pool->list); |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 599 | ++pool->nrefills; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 600 | pool->npages += alloc_size; |
| 601 | } else { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 602 | printk(KERN_ERR TTM_PFX |
| 603 | "Failed to fill pool (%p).", pool); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 604 | /* If we have any pages left put them to the pool. */ |
| 605 | list_for_each_entry(p, &pool->list, lru) { |
| 606 | ++cpages; |
| 607 | } |
| 608 | list_splice(&new_pages, &pool->list); |
| 609 | pool->npages += cpages; |
| 610 | } |
| 611 | |
| 612 | } |
| 613 | pool->fill_lock = false; |
| 614 | } |
| 615 | |
| 616 | /** |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame^] | 617 | * Cut 'count' number of pages from the pool and put them on the return list. |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 618 | * |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame^] | 619 | * @return count of pages still required to fulfill the request. |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 620 | */ |
| 621 | static unsigned ttm_page_pool_get_pages(struct ttm_page_pool *pool, |
| 622 | struct list_head *pages, int ttm_flags, |
| 623 | enum ttm_caching_state cstate, unsigned count) |
| 624 | { |
| 625 | unsigned long irq_flags; |
| 626 | struct list_head *p; |
| 627 | unsigned i; |
| 628 | |
| 629 | spin_lock_irqsave(&pool->lock, irq_flags); |
| 630 | ttm_page_pool_fill_locked(pool, ttm_flags, cstate, count, &irq_flags); |
| 631 | |
| 632 | if (count >= pool->npages) { |
| 633 | /* take all pages from the pool */ |
| 634 | list_splice_init(&pool->list, pages); |
| 635 | count -= pool->npages; |
| 636 | pool->npages = 0; |
| 637 | goto out; |
| 638 | } |
| 639 | /* find the last pages to include for requested number of pages. Split |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame^] | 640 | * pool to begin and halve it to reduce search space. */ |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 641 | if (count <= pool->npages/2) { |
| 642 | i = 0; |
| 643 | list_for_each(p, &pool->list) { |
| 644 | if (++i == count) |
| 645 | break; |
| 646 | } |
| 647 | } else { |
| 648 | i = pool->npages + 1; |
| 649 | list_for_each_prev(p, &pool->list) { |
| 650 | if (--i == count) |
| 651 | break; |
| 652 | } |
| 653 | } |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame^] | 654 | /* Cut 'count' number of pages from the pool */ |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 655 | list_cut_position(pages, &pool->list, p); |
| 656 | pool->npages -= count; |
| 657 | count = 0; |
| 658 | out: |
| 659 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 660 | return count; |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * On success pages list will hold count number of correctly |
| 665 | * cached pages. |
| 666 | */ |
| 667 | int ttm_get_pages(struct list_head *pages, int flags, |
Konrad Rzeszutek Wilk | f9820a4 | 2010-11-29 13:52:18 -0500 | [diff] [blame] | 668 | enum ttm_caching_state cstate, unsigned count, |
Dave Airlie | a2c06ee | 2011-02-23 14:24:01 +1000 | [diff] [blame] | 669 | dma_addr_t *dma_address) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 670 | { |
| 671 | struct ttm_page_pool *pool = ttm_get_pool(flags, cstate); |
| 672 | struct page *p = NULL; |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 673 | gfp_t gfp_flags = GFP_USER; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 674 | int r; |
| 675 | |
| 676 | /* set zero flag for page allocation if required */ |
| 677 | if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) |
| 678 | gfp_flags |= __GFP_ZERO; |
| 679 | |
| 680 | /* No pool for cached pages */ |
| 681 | if (pool == NULL) { |
| 682 | if (flags & TTM_PAGE_FLAG_DMA32) |
| 683 | gfp_flags |= GFP_DMA32; |
| 684 | else |
Thomas Hellstrom | e8613c0 | 2010-05-26 16:21:03 +0200 | [diff] [blame] | 685 | gfp_flags |= GFP_HIGHUSER; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 686 | |
| 687 | for (r = 0; r < count; ++r) { |
Dave Airlie | d87dfdb | 2011-04-13 09:15:09 +1000 | [diff] [blame] | 688 | p = alloc_page(gfp_flags); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 689 | if (!p) { |
| 690 | |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 691 | printk(KERN_ERR TTM_PFX |
| 692 | "Unable to allocate page."); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 693 | return -ENOMEM; |
| 694 | } |
Dave Airlie | d87dfdb | 2011-04-13 09:15:09 +1000 | [diff] [blame] | 695 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 696 | list_add(&p->lru, pages); |
| 697 | } |
| 698 | return 0; |
| 699 | } |
| 700 | |
| 701 | |
| 702 | /* combine zero flag to pool flags */ |
| 703 | gfp_flags |= pool->gfp_flags; |
| 704 | |
| 705 | /* First we take pages from the pool */ |
| 706 | count = ttm_page_pool_get_pages(pool, pages, flags, cstate, count); |
| 707 | |
| 708 | /* clear the pages coming from the pool if requested */ |
| 709 | if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) { |
| 710 | list_for_each_entry(p, pages, lru) { |
| 711 | clear_page(page_address(p)); |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | /* If pool didn't have enough pages allocate new one. */ |
| 716 | if (count > 0) { |
| 717 | /* ttm_alloc_new_pages doesn't reference pool so we can run |
| 718 | * multiple requests in parallel. |
| 719 | **/ |
| 720 | r = ttm_alloc_new_pages(pages, gfp_flags, flags, cstate, count); |
| 721 | if (r) { |
| 722 | /* If there is any pages in the list put them back to |
| 723 | * the pool. */ |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 724 | printk(KERN_ERR TTM_PFX |
| 725 | "Failed to allocate extra pages " |
| 726 | "for large request."); |
Dave Airlie | a2c06ee | 2011-02-23 14:24:01 +1000 | [diff] [blame] | 727 | ttm_put_pages(pages, 0, flags, cstate, NULL); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 728 | return r; |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | /* Put all pages in pages list to correct pool to wait for reuse */ |
| 737 | void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags, |
Dave Airlie | a2c06ee | 2011-02-23 14:24:01 +1000 | [diff] [blame] | 738 | enum ttm_caching_state cstate, dma_addr_t *dma_address) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 739 | { |
| 740 | unsigned long irq_flags; |
| 741 | struct ttm_page_pool *pool = ttm_get_pool(flags, cstate); |
| 742 | struct page *p, *tmp; |
| 743 | |
| 744 | if (pool == NULL) { |
| 745 | /* No pool for this memory type so free the pages */ |
| 746 | |
| 747 | list_for_each_entry_safe(p, tmp, pages, lru) { |
Dave Airlie | d87dfdb | 2011-04-13 09:15:09 +1000 | [diff] [blame] | 748 | __free_page(p); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 749 | } |
| 750 | /* Make the pages list empty */ |
| 751 | INIT_LIST_HEAD(pages); |
| 752 | return; |
| 753 | } |
| 754 | if (page_count == 0) { |
| 755 | list_for_each_entry_safe(p, tmp, pages, lru) { |
| 756 | ++page_count; |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | spin_lock_irqsave(&pool->lock, irq_flags); |
| 761 | list_splice_init(pages, &pool->list); |
| 762 | pool->npages += page_count; |
| 763 | /* Check that we don't go over the pool limit */ |
| 764 | page_count = 0; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 765 | if (pool->npages > _manager->options.max_size) { |
| 766 | page_count = pool->npages - _manager->options.max_size; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 767 | /* free at least NUM_PAGES_TO_ALLOC number of pages |
| 768 | * to reduce calls to set_memory_wb */ |
| 769 | if (page_count < NUM_PAGES_TO_ALLOC) |
| 770 | page_count = NUM_PAGES_TO_ALLOC; |
| 771 | } |
| 772 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 773 | if (page_count) |
| 774 | ttm_page_pool_free(pool, page_count); |
| 775 | } |
| 776 | |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 777 | static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, int flags, |
| 778 | char *name) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 779 | { |
| 780 | spin_lock_init(&pool->lock); |
| 781 | pool->fill_lock = false; |
| 782 | INIT_LIST_HEAD(&pool->list); |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 783 | pool->npages = pool->nfrees = 0; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 784 | pool->gfp_flags = flags; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 785 | pool->name = name; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 786 | } |
| 787 | |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 788 | int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 789 | { |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 790 | int ret; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 791 | |
| 792 | WARN_ON(_manager); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 793 | |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 794 | printk(KERN_INFO TTM_PFX "Initializing pool allocator.\n"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 795 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 796 | _manager = kzalloc(sizeof(*_manager), GFP_KERNEL); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 797 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 798 | ttm_page_pool_init_locked(&_manager->wc_pool, GFP_HIGHUSER, "wc"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 799 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 800 | ttm_page_pool_init_locked(&_manager->uc_pool, GFP_HIGHUSER, "uc"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 801 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 802 | ttm_page_pool_init_locked(&_manager->wc_pool_dma32, |
| 803 | GFP_USER | GFP_DMA32, "wc dma"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 804 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 805 | ttm_page_pool_init_locked(&_manager->uc_pool_dma32, |
| 806 | GFP_USER | GFP_DMA32, "uc dma"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 807 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 808 | _manager->options.max_size = max_pages; |
| 809 | _manager->options.small = SMALL_ALLOCATION; |
| 810 | _manager->options.alloc_size = NUM_PAGES_TO_ALLOC; |
| 811 | |
| 812 | ret = kobject_init_and_add(&_manager->kobj, &ttm_pool_kobj_type, |
| 813 | &glob->kobj, "pool"); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 814 | if (unlikely(ret != 0)) { |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 815 | kobject_put(&_manager->kobj); |
| 816 | _manager = NULL; |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 817 | return ret; |
| 818 | } |
| 819 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 820 | ttm_pool_mm_shrink_init(_manager); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 821 | |
| 822 | return 0; |
| 823 | } |
| 824 | |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 825 | void ttm_page_alloc_fini(void) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 826 | { |
| 827 | int i; |
| 828 | |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 829 | printk(KERN_INFO TTM_PFX "Finalizing pool allocator.\n"); |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 830 | ttm_pool_mm_shrink_fini(_manager); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 831 | |
| 832 | for (i = 0; i < NUM_POOLS; ++i) |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 833 | ttm_page_pool_free(&_manager->pools[i], FREE_ALL_PAGES); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 834 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 835 | kobject_put(&_manager->kobj); |
| 836 | _manager = NULL; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 837 | } |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 838 | |
| 839 | int ttm_page_alloc_debugfs(struct seq_file *m, void *data) |
| 840 | { |
| 841 | struct ttm_page_pool *p; |
| 842 | unsigned i; |
| 843 | char *h[] = {"pool", "refills", "pages freed", "size"}; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 844 | if (!_manager) { |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 845 | seq_printf(m, "No pool allocator running.\n"); |
| 846 | return 0; |
| 847 | } |
| 848 | seq_printf(m, "%6s %12s %13s %8s\n", |
| 849 | h[0], h[1], h[2], h[3]); |
| 850 | for (i = 0; i < NUM_POOLS; ++i) { |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 851 | p = &_manager->pools[i]; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 852 | |
| 853 | seq_printf(m, "%6s %12ld %13ld %8d\n", |
| 854 | p->name, p->nrefills, |
| 855 | p->nfrees, p->npages); |
| 856 | } |
| 857 | return 0; |
| 858 | } |
| 859 | EXPORT_SYMBOL(ttm_page_alloc_debugfs); |