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 | */ |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 33 | |
| 34 | #define pr_fmt(fmt) "[TTM] " fmt |
| 35 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 36 | #include <linux/list.h> |
| 37 | #include <linux/spinlock.h> |
| 38 | #include <linux/highmem.h> |
| 39 | #include <linux/mm_types.h> |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 40 | #include <linux/module.h> |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 41 | #include <linux/mm.h> |
Matt Turner | 4cdc840 | 2010-04-07 22:42:04 +0000 | [diff] [blame] | 42 | #include <linux/seq_file.h> /* for seq_printf */ |
Stephen Rothwell | 2125b8a | 2010-04-08 13:42:03 +1000 | [diff] [blame] | 43 | #include <linux/slab.h> |
Konrad Rzeszutek Wilk | f9820a4 | 2010-11-29 13:52:18 -0500 | [diff] [blame] | 44 | #include <linux/dma-mapping.h> |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 45 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 46 | #include <linux/atomic.h> |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 47 | |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 48 | #include <drm/ttm/ttm_bo_driver.h> |
| 49 | #include <drm/ttm/ttm_page_alloc.h> |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 50 | |
Luck, Tony | d667865 | 2010-07-21 10:15:39 -0700 | [diff] [blame] | 51 | #ifdef TTM_HAS_AGP |
| 52 | #include <asm/agp.h> |
| 53 | #endif |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 54 | |
| 55 | #define NUM_PAGES_TO_ALLOC (PAGE_SIZE/sizeof(struct page *)) |
| 56 | #define SMALL_ALLOCATION 16 |
| 57 | #define FREE_ALL_PAGES (~0U) |
| 58 | /* times are in msecs */ |
| 59 | #define PAGE_FREE_INTERVAL 1000 |
| 60 | |
| 61 | /** |
| 62 | * struct ttm_page_pool - Pool to reuse recently allocated uc/wc pages. |
| 63 | * |
| 64 | * @lock: Protects the shared pool from concurrnet access. Must be used with |
| 65 | * irqsave/irqrestore variants because pool allocator maybe called from |
| 66 | * delayed work. |
| 67 | * @fill_lock: Prevent concurrent calls to fill. |
| 68 | * @list: Pool of free uc/wc pages for fast reuse. |
| 69 | * @gfp_flags: Flags to pass for alloc_page. |
| 70 | * @npages: Number of pages in pool. |
| 71 | */ |
| 72 | struct ttm_page_pool { |
| 73 | spinlock_t lock; |
| 74 | bool fill_lock; |
| 75 | struct list_head list; |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 76 | gfp_t gfp_flags; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 77 | unsigned npages; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 78 | char *name; |
| 79 | unsigned long nfrees; |
| 80 | unsigned long nrefills; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 81 | }; |
| 82 | |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 83 | /** |
| 84 | * Limits for the pool. They are handled without locks because only place where |
| 85 | * 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] | 86 | * so forcing serialization to access them is pointless. |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 87 | */ |
| 88 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 89 | struct ttm_pool_opts { |
| 90 | unsigned alloc_size; |
| 91 | unsigned max_size; |
| 92 | unsigned small; |
| 93 | }; |
| 94 | |
| 95 | #define NUM_POOLS 4 |
| 96 | |
| 97 | /** |
| 98 | * struct ttm_pool_manager - Holds memory pools for fst allocation |
| 99 | * |
| 100 | * Manager is read only object for pool code so it doesn't need locking. |
| 101 | * |
| 102 | * @free_interval: minimum number of jiffies between freeing pages from pool. |
| 103 | * @page_alloc_inited: reference counting for pool allocation. |
| 104 | * @work: Work that is used to shrink the pool. Work is only run when there is |
| 105 | * some pages to free. |
| 106 | * @small_allocation: Limit in number of pages what is small allocation. |
| 107 | * |
| 108 | * @pools: All pool objects in use. |
| 109 | **/ |
| 110 | struct ttm_pool_manager { |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 111 | struct kobject kobj; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 112 | struct shrinker mm_shrink; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 113 | struct ttm_pool_opts options; |
| 114 | |
| 115 | union { |
| 116 | struct ttm_page_pool pools[NUM_POOLS]; |
| 117 | struct { |
| 118 | struct ttm_page_pool wc_pool; |
| 119 | struct ttm_page_pool uc_pool; |
| 120 | struct ttm_page_pool wc_pool_dma32; |
| 121 | struct ttm_page_pool uc_pool_dma32; |
| 122 | } ; |
| 123 | }; |
| 124 | }; |
| 125 | |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 126 | static struct attribute ttm_page_pool_max = { |
| 127 | .name = "pool_max_size", |
| 128 | .mode = S_IRUGO | S_IWUSR |
| 129 | }; |
| 130 | static struct attribute ttm_page_pool_small = { |
| 131 | .name = "pool_small_allocation", |
| 132 | .mode = S_IRUGO | S_IWUSR |
| 133 | }; |
| 134 | static struct attribute ttm_page_pool_alloc_size = { |
| 135 | .name = "pool_allocation_size", |
| 136 | .mode = S_IRUGO | S_IWUSR |
| 137 | }; |
| 138 | |
| 139 | static struct attribute *ttm_pool_attrs[] = { |
| 140 | &ttm_page_pool_max, |
| 141 | &ttm_page_pool_small, |
| 142 | &ttm_page_pool_alloc_size, |
| 143 | NULL |
| 144 | }; |
| 145 | |
| 146 | static void ttm_pool_kobj_release(struct kobject *kobj) |
| 147 | { |
| 148 | struct ttm_pool_manager *m = |
| 149 | container_of(kobj, struct ttm_pool_manager, kobj); |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 150 | kfree(m); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | static ssize_t ttm_pool_store(struct kobject *kobj, |
| 154 | struct attribute *attr, const char *buffer, size_t size) |
| 155 | { |
| 156 | struct ttm_pool_manager *m = |
| 157 | container_of(kobj, struct ttm_pool_manager, kobj); |
| 158 | int chars; |
| 159 | unsigned val; |
| 160 | chars = sscanf(buffer, "%u", &val); |
| 161 | if (chars == 0) |
| 162 | return size; |
| 163 | |
| 164 | /* Convert kb to number of pages */ |
| 165 | val = val / (PAGE_SIZE >> 10); |
| 166 | |
| 167 | if (attr == &ttm_page_pool_max) |
| 168 | m->options.max_size = val; |
| 169 | else if (attr == &ttm_page_pool_small) |
| 170 | m->options.small = val; |
| 171 | else if (attr == &ttm_page_pool_alloc_size) { |
| 172 | if (val > NUM_PAGES_TO_ALLOC*8) { |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 173 | pr_err("Setting allocation size to %lu is not allowed. Recommended size is %lu\n", |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 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) { |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 178 | pr_warn("Setting allocation size to larger than %lu is not recommended\n", |
| 179 | NUM_PAGES_TO_ALLOC*(PAGE_SIZE >> 10)); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 180 | } |
| 181 | m->options.alloc_size = val; |
| 182 | } |
| 183 | |
| 184 | return size; |
| 185 | } |
| 186 | |
| 187 | static ssize_t ttm_pool_show(struct kobject *kobj, |
| 188 | struct attribute *attr, char *buffer) |
| 189 | { |
| 190 | struct ttm_pool_manager *m = |
| 191 | container_of(kobj, struct ttm_pool_manager, kobj); |
| 192 | unsigned val = 0; |
| 193 | |
| 194 | if (attr == &ttm_page_pool_max) |
| 195 | val = m->options.max_size; |
| 196 | else if (attr == &ttm_page_pool_small) |
| 197 | val = m->options.small; |
| 198 | else if (attr == &ttm_page_pool_alloc_size) |
| 199 | val = m->options.alloc_size; |
| 200 | |
| 201 | val = val * (PAGE_SIZE >> 10); |
| 202 | |
| 203 | return snprintf(buffer, PAGE_SIZE, "%u\n", val); |
| 204 | } |
| 205 | |
| 206 | static const struct sysfs_ops ttm_pool_sysfs_ops = { |
| 207 | .show = &ttm_pool_show, |
| 208 | .store = &ttm_pool_store, |
| 209 | }; |
| 210 | |
| 211 | static struct kobj_type ttm_pool_kobj_type = { |
| 212 | .release = &ttm_pool_kobj_release, |
| 213 | .sysfs_ops = &ttm_pool_sysfs_ops, |
| 214 | .default_attrs = ttm_pool_attrs, |
| 215 | }; |
| 216 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 217 | static struct ttm_pool_manager *_manager; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 218 | |
Pauli Nieminen | 975efdb | 2010-04-01 12:45:02 +0000 | [diff] [blame] | 219 | #ifndef CONFIG_X86 |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 220 | static int set_pages_array_wb(struct page **pages, int addrinarray) |
| 221 | { |
| 222 | #ifdef TTM_HAS_AGP |
| 223 | int i; |
| 224 | |
| 225 | for (i = 0; i < addrinarray; i++) |
| 226 | unmap_page_from_agp(pages[i]); |
| 227 | #endif |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | static int set_pages_array_wc(struct page **pages, int addrinarray) |
| 232 | { |
| 233 | #ifdef TTM_HAS_AGP |
| 234 | int i; |
| 235 | |
| 236 | for (i = 0; i < addrinarray; i++) |
| 237 | map_page_into_agp(pages[i]); |
| 238 | #endif |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static int set_pages_array_uc(struct page **pages, int addrinarray) |
| 243 | { |
| 244 | #ifdef TTM_HAS_AGP |
| 245 | int i; |
| 246 | |
| 247 | for (i = 0; i < addrinarray; i++) |
| 248 | map_page_into_agp(pages[i]); |
| 249 | #endif |
| 250 | return 0; |
| 251 | } |
| 252 | #endif |
| 253 | |
| 254 | /** |
| 255 | * Select the right pool or requested caching state and ttm flags. */ |
| 256 | static struct ttm_page_pool *ttm_get_pool(int flags, |
| 257 | enum ttm_caching_state cstate) |
| 258 | { |
| 259 | int pool_index; |
| 260 | |
| 261 | if (cstate == tt_cached) |
| 262 | return NULL; |
| 263 | |
| 264 | if (cstate == tt_wc) |
| 265 | pool_index = 0x0; |
| 266 | else |
| 267 | pool_index = 0x1; |
| 268 | |
| 269 | if (flags & TTM_PAGE_FLAG_DMA32) |
| 270 | pool_index |= 0x2; |
| 271 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 272 | return &_manager->pools[pool_index]; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | /* set memory back to wb and free the pages. */ |
| 276 | static void ttm_pages_put(struct page *pages[], unsigned npages) |
| 277 | { |
| 278 | unsigned i; |
| 279 | if (set_pages_array_wb(pages, npages)) |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 280 | pr_err("Failed to set %d pages to wb!\n", npages); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 281 | for (i = 0; i < npages; ++i) |
| 282 | __free_page(pages[i]); |
| 283 | } |
| 284 | |
| 285 | static void ttm_pool_update_free_locked(struct ttm_page_pool *pool, |
| 286 | unsigned freed_pages) |
| 287 | { |
| 288 | pool->npages -= freed_pages; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 289 | pool->nfrees += freed_pages; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | /** |
| 293 | * Free pages from pool. |
| 294 | * |
| 295 | * To prevent hogging the ttm_swap process we only free NUM_PAGES_TO_ALLOC |
| 296 | * number of pages in one go. |
| 297 | * |
| 298 | * @pool: to free the pages from |
| 299 | * @free_all: If set to true will free all pages in pool |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 300 | * @use_static: Safe to use static buffer |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 301 | **/ |
Tetsuo Handa | a91576d | 2014-08-03 20:02:31 +0900 | [diff] [blame] | 302 | static int ttm_page_pool_free(struct ttm_page_pool *pool, unsigned nr_free, |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 303 | bool use_static) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 304 | { |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 305 | static struct page *static_buf[NUM_PAGES_TO_ALLOC]; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 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 | |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 315 | if (use_static) |
| 316 | pages_to_free = static_buf; |
| 317 | else |
| 318 | pages_to_free = kmalloc(npages_to_free * sizeof(struct page *), |
| 319 | GFP_KERNEL); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 320 | if (!pages_to_free) { |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 321 | pr_err("Failed to allocate memory for pool free operation\n"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | restart: |
| 326 | spin_lock_irqsave(&pool->lock, irq_flags); |
| 327 | |
| 328 | list_for_each_entry_reverse(p, &pool->list, lru) { |
| 329 | if (freed_pages >= npages_to_free) |
| 330 | break; |
| 331 | |
| 332 | pages_to_free[freed_pages++] = p; |
| 333 | /* We can only remove NUM_PAGES_TO_ALLOC at a time. */ |
| 334 | if (freed_pages >= NUM_PAGES_TO_ALLOC) { |
| 335 | /* remove range of pages from the pool */ |
| 336 | __list_del(p->lru.prev, &pool->list); |
| 337 | |
| 338 | ttm_pool_update_free_locked(pool, freed_pages); |
| 339 | /** |
| 340 | * Because changing page caching is costly |
| 341 | * we unlock the pool to prevent stalling. |
| 342 | */ |
| 343 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 344 | |
| 345 | ttm_pages_put(pages_to_free, freed_pages); |
| 346 | if (likely(nr_free != FREE_ALL_PAGES)) |
| 347 | nr_free -= freed_pages; |
| 348 | |
| 349 | if (NUM_PAGES_TO_ALLOC >= nr_free) |
| 350 | npages_to_free = nr_free; |
| 351 | else |
| 352 | npages_to_free = NUM_PAGES_TO_ALLOC; |
| 353 | |
| 354 | freed_pages = 0; |
| 355 | |
| 356 | /* free all so restart the processing */ |
| 357 | if (nr_free) |
| 358 | goto restart; |
| 359 | |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame] | 360 | /* Not allowed to fall through or break because |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 361 | * following context is inside spinlock while we are |
| 362 | * outside here. |
| 363 | */ |
| 364 | goto out; |
| 365 | |
| 366 | } |
| 367 | } |
| 368 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 369 | /* remove range of pages from the pool */ |
| 370 | if (freed_pages) { |
| 371 | __list_del(&p->lru, &pool->list); |
| 372 | |
| 373 | ttm_pool_update_free_locked(pool, freed_pages); |
| 374 | nr_free -= freed_pages; |
| 375 | } |
| 376 | |
| 377 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 378 | |
| 379 | if (freed_pages) |
| 380 | ttm_pages_put(pages_to_free, freed_pages); |
| 381 | out: |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 382 | if (pages_to_free != static_buf) |
| 383 | kfree(pages_to_free); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 384 | return nr_free; |
| 385 | } |
| 386 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 387 | /** |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 388 | * Callback for mm to request pool to reduce number of page held. |
Dave Chinner | 7dc19d5 | 2013-08-28 10:18:11 +1000 | [diff] [blame] | 389 | * |
| 390 | * XXX: (dchinner) Deadlock warning! |
| 391 | * |
Dave Chinner | 7dc19d5 | 2013-08-28 10:18:11 +1000 | [diff] [blame] | 392 | * This code is crying out for a shrinker per pool.... |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 393 | */ |
Dave Chinner | 7dc19d5 | 2013-08-28 10:18:11 +1000 | [diff] [blame] | 394 | static unsigned long |
| 395 | ttm_pool_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 396 | { |
Tetsuo Handa | 71336e0 | 2014-08-03 20:02:03 +0900 | [diff] [blame] | 397 | static DEFINE_MUTEX(lock); |
| 398 | static unsigned start_pool; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 399 | unsigned i; |
Tetsuo Handa | 71336e0 | 2014-08-03 20:02:03 +0900 | [diff] [blame] | 400 | unsigned pool_offset; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 401 | struct ttm_page_pool *pool; |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 402 | int shrink_pages = sc->nr_to_scan; |
Dave Chinner | 7dc19d5 | 2013-08-28 10:18:11 +1000 | [diff] [blame] | 403 | unsigned long freed = 0; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 404 | |
Tetsuo Handa | 71336e0 | 2014-08-03 20:02:03 +0900 | [diff] [blame] | 405 | if (!mutex_trylock(&lock)) |
| 406 | return SHRINK_STOP; |
| 407 | pool_offset = ++start_pool % NUM_POOLS; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 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]; |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 414 | /* OK to use static buffer since global mutex is held. */ |
| 415 | shrink_pages = ttm_page_pool_free(pool, nr_free, true); |
Dave Chinner | 7dc19d5 | 2013-08-28 10:18:11 +1000 | [diff] [blame] | 416 | freed += nr_free - shrink_pages; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 417 | } |
Tetsuo Handa | 71336e0 | 2014-08-03 20:02:03 +0900 | [diff] [blame] | 418 | mutex_unlock(&lock); |
Dave Chinner | 7dc19d5 | 2013-08-28 10:18:11 +1000 | [diff] [blame] | 419 | return freed; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | static unsigned long |
| 424 | ttm_pool_shrink_count(struct shrinker *shrink, struct shrink_control *sc) |
| 425 | { |
| 426 | unsigned i; |
| 427 | unsigned long count = 0; |
| 428 | |
| 429 | for (i = 0; i < NUM_POOLS; ++i) |
| 430 | count += _manager->pools[i].npages; |
| 431 | |
| 432 | return count; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | static void ttm_pool_mm_shrink_init(struct ttm_pool_manager *manager) |
| 436 | { |
Dave Chinner | 7dc19d5 | 2013-08-28 10:18:11 +1000 | [diff] [blame] | 437 | manager->mm_shrink.count_objects = ttm_pool_shrink_count; |
| 438 | manager->mm_shrink.scan_objects = ttm_pool_shrink_scan; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 439 | manager->mm_shrink.seeks = 1; |
| 440 | register_shrinker(&manager->mm_shrink); |
| 441 | } |
| 442 | |
| 443 | static void ttm_pool_mm_shrink_fini(struct ttm_pool_manager *manager) |
| 444 | { |
| 445 | unregister_shrinker(&manager->mm_shrink); |
| 446 | } |
| 447 | |
| 448 | static int ttm_set_pages_caching(struct page **pages, |
| 449 | enum ttm_caching_state cstate, unsigned cpages) |
| 450 | { |
| 451 | int r = 0; |
| 452 | /* Set page caching */ |
| 453 | switch (cstate) { |
| 454 | case tt_uncached: |
| 455 | r = set_pages_array_uc(pages, cpages); |
| 456 | if (r) |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 457 | pr_err("Failed to set %d pages to uc!\n", cpages); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 458 | break; |
| 459 | case tt_wc: |
| 460 | r = set_pages_array_wc(pages, cpages); |
| 461 | if (r) |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 462 | pr_err("Failed to set %d pages to wc!\n", cpages); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 463 | break; |
| 464 | default: |
| 465 | break; |
| 466 | } |
| 467 | return r; |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * Free pages the pages that failed to change the caching state. If there is |
| 472 | * any pages that have changed their caching state already put them to the |
| 473 | * pool. |
| 474 | */ |
| 475 | static void ttm_handle_caching_state_failure(struct list_head *pages, |
| 476 | int ttm_flags, enum ttm_caching_state cstate, |
| 477 | struct page **failed_pages, unsigned cpages) |
| 478 | { |
| 479 | unsigned i; |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 480 | /* Failed pages have to be freed */ |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 481 | for (i = 0; i < cpages; ++i) { |
| 482 | list_del(&failed_pages[i]->lru); |
| 483 | __free_page(failed_pages[i]); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | /** |
| 488 | * Allocate new pages with correct caching. |
| 489 | * |
| 490 | * This function is reentrant if caller updates count depending on number of |
| 491 | * pages returned in pages array. |
| 492 | */ |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 493 | 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] | 494 | int ttm_flags, enum ttm_caching_state cstate, unsigned count) |
| 495 | { |
| 496 | struct page **caching_array; |
| 497 | struct page *p; |
| 498 | int r = 0; |
| 499 | unsigned i, cpages; |
| 500 | unsigned max_cpages = min(count, |
| 501 | (unsigned)(PAGE_SIZE/sizeof(struct page *))); |
| 502 | |
| 503 | /* allocate array for page caching change */ |
| 504 | caching_array = kmalloc(max_cpages*sizeof(struct page *), GFP_KERNEL); |
| 505 | |
| 506 | if (!caching_array) { |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 507 | pr_err("Unable to allocate table for new pages\n"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 508 | return -ENOMEM; |
| 509 | } |
| 510 | |
| 511 | for (i = 0, cpages = 0; i < count; ++i) { |
| 512 | p = alloc_page(gfp_flags); |
| 513 | |
| 514 | if (!p) { |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 515 | pr_err("Unable to get page %u\n", i); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 516 | |
| 517 | /* store already allocated pages in the pool after |
| 518 | * setting the caching state */ |
| 519 | if (cpages) { |
Thomas Hellstrom | 4abe438 | 2010-05-26 16:21:04 +0200 | [diff] [blame] | 520 | r = ttm_set_pages_caching(caching_array, |
| 521 | cstate, cpages); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 522 | if (r) |
| 523 | ttm_handle_caching_state_failure(pages, |
| 524 | ttm_flags, cstate, |
| 525 | caching_array, cpages); |
| 526 | } |
| 527 | r = -ENOMEM; |
| 528 | goto out; |
| 529 | } |
| 530 | |
| 531 | #ifdef CONFIG_HIGHMEM |
| 532 | /* gfp flags of highmem page should never be dma32 so we |
| 533 | * we should be fine in such case |
| 534 | */ |
| 535 | if (!PageHighMem(p)) |
| 536 | #endif |
| 537 | { |
| 538 | caching_array[cpages++] = p; |
| 539 | if (cpages == max_cpages) { |
| 540 | |
| 541 | r = ttm_set_pages_caching(caching_array, |
| 542 | cstate, cpages); |
| 543 | if (r) { |
| 544 | ttm_handle_caching_state_failure(pages, |
| 545 | ttm_flags, cstate, |
| 546 | caching_array, cpages); |
| 547 | goto out; |
| 548 | } |
| 549 | cpages = 0; |
| 550 | } |
| 551 | } |
| 552 | |
| 553 | list_add(&p->lru, pages); |
| 554 | } |
| 555 | |
| 556 | if (cpages) { |
| 557 | r = ttm_set_pages_caching(caching_array, cstate, cpages); |
| 558 | if (r) |
| 559 | ttm_handle_caching_state_failure(pages, |
| 560 | ttm_flags, cstate, |
| 561 | caching_array, cpages); |
| 562 | } |
| 563 | out: |
| 564 | kfree(caching_array); |
| 565 | |
| 566 | return r; |
| 567 | } |
| 568 | |
| 569 | /** |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame] | 570 | * 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] | 571 | * pages is small. |
| 572 | */ |
| 573 | static void ttm_page_pool_fill_locked(struct ttm_page_pool *pool, |
| 574 | int ttm_flags, enum ttm_caching_state cstate, unsigned count, |
| 575 | unsigned long *irq_flags) |
| 576 | { |
| 577 | struct page *p; |
| 578 | int r; |
| 579 | unsigned cpages = 0; |
| 580 | /** |
| 581 | * Only allow one pool fill operation at a time. |
| 582 | * If pool doesn't have enough pages for the allocation new pages are |
| 583 | * allocated from outside of pool. |
| 584 | */ |
| 585 | if (pool->fill_lock) |
| 586 | return; |
| 587 | |
| 588 | pool->fill_lock = true; |
| 589 | |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame] | 590 | /* If allocation request is small and there are not enough |
| 591 | * pages in a pool we fill the pool up first. */ |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 592 | if (count < _manager->options.small |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 593 | && count > pool->npages) { |
| 594 | struct list_head new_pages; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 595 | unsigned alloc_size = _manager->options.alloc_size; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 596 | |
| 597 | /** |
| 598 | * Can't change page caching if in irqsave context. We have to |
| 599 | * drop the pool->lock. |
| 600 | */ |
| 601 | spin_unlock_irqrestore(&pool->lock, *irq_flags); |
| 602 | |
| 603 | INIT_LIST_HEAD(&new_pages); |
| 604 | r = ttm_alloc_new_pages(&new_pages, pool->gfp_flags, ttm_flags, |
| 605 | cstate, alloc_size); |
| 606 | spin_lock_irqsave(&pool->lock, *irq_flags); |
| 607 | |
| 608 | if (!r) { |
| 609 | list_splice(&new_pages, &pool->list); |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 610 | ++pool->nrefills; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 611 | pool->npages += alloc_size; |
| 612 | } else { |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 613 | pr_err("Failed to fill pool (%p)\n", pool); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 614 | /* If we have any pages left put them to the pool. */ |
| 615 | list_for_each_entry(p, &pool->list, lru) { |
| 616 | ++cpages; |
| 617 | } |
| 618 | list_splice(&new_pages, &pool->list); |
| 619 | pool->npages += cpages; |
| 620 | } |
| 621 | |
| 622 | } |
| 623 | pool->fill_lock = false; |
| 624 | } |
| 625 | |
| 626 | /** |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame] | 627 | * 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] | 628 | * |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame] | 629 | * @return count of pages still required to fulfill the request. |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 630 | */ |
| 631 | static unsigned ttm_page_pool_get_pages(struct ttm_page_pool *pool, |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 632 | struct list_head *pages, |
| 633 | int ttm_flags, |
| 634 | enum ttm_caching_state cstate, |
| 635 | unsigned count) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 636 | { |
| 637 | unsigned long irq_flags; |
| 638 | struct list_head *p; |
| 639 | unsigned i; |
| 640 | |
| 641 | spin_lock_irqsave(&pool->lock, irq_flags); |
| 642 | ttm_page_pool_fill_locked(pool, ttm_flags, cstate, count, &irq_flags); |
| 643 | |
| 644 | if (count >= pool->npages) { |
| 645 | /* take all pages from the pool */ |
| 646 | list_splice_init(&pool->list, pages); |
| 647 | count -= pool->npages; |
| 648 | pool->npages = 0; |
| 649 | goto out; |
| 650 | } |
| 651 | /* 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] | 652 | * pool to begin and halve it to reduce search space. */ |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 653 | if (count <= pool->npages/2) { |
| 654 | i = 0; |
| 655 | list_for_each(p, &pool->list) { |
| 656 | if (++i == count) |
| 657 | break; |
| 658 | } |
| 659 | } else { |
| 660 | i = pool->npages + 1; |
| 661 | list_for_each_prev(p, &pool->list) { |
| 662 | if (--i == count) |
| 663 | break; |
| 664 | } |
| 665 | } |
Konrad Rzeszutek Wilk | 0d74f86 | 2011-06-08 17:06:15 +0000 | [diff] [blame] | 666 | /* Cut 'count' number of pages from the pool */ |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 667 | list_cut_position(pages, &pool->list, p); |
| 668 | pool->npages -= count; |
| 669 | count = 0; |
| 670 | out: |
| 671 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 672 | return count; |
| 673 | } |
| 674 | |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 675 | /* Put all pages in pages list to correct pool to wait for reuse */ |
| 676 | static void ttm_put_pages(struct page **pages, unsigned npages, int flags, |
| 677 | enum ttm_caching_state cstate) |
| 678 | { |
| 679 | unsigned long irq_flags; |
| 680 | struct ttm_page_pool *pool = ttm_get_pool(flags, cstate); |
| 681 | unsigned i; |
| 682 | |
| 683 | if (pool == NULL) { |
| 684 | /* No pool for this memory type so free the pages */ |
| 685 | for (i = 0; i < npages; i++) { |
| 686 | if (pages[i]) { |
| 687 | if (page_count(pages[i]) != 1) |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 688 | pr_err("Erroneous page count. Leaking pages.\n"); |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 689 | __free_page(pages[i]); |
| 690 | pages[i] = NULL; |
| 691 | } |
| 692 | } |
| 693 | return; |
| 694 | } |
| 695 | |
| 696 | spin_lock_irqsave(&pool->lock, irq_flags); |
| 697 | for (i = 0; i < npages; i++) { |
| 698 | if (pages[i]) { |
| 699 | if (page_count(pages[i]) != 1) |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 700 | pr_err("Erroneous page count. Leaking pages.\n"); |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 701 | list_add_tail(&pages[i]->lru, &pool->list); |
| 702 | pages[i] = NULL; |
| 703 | pool->npages++; |
| 704 | } |
| 705 | } |
| 706 | /* Check that we don't go over the pool limit */ |
| 707 | npages = 0; |
| 708 | if (pool->npages > _manager->options.max_size) { |
| 709 | npages = pool->npages - _manager->options.max_size; |
| 710 | /* free at least NUM_PAGES_TO_ALLOC number of pages |
| 711 | * to reduce calls to set_memory_wb */ |
| 712 | if (npages < NUM_PAGES_TO_ALLOC) |
| 713 | npages = NUM_PAGES_TO_ALLOC; |
| 714 | } |
| 715 | spin_unlock_irqrestore(&pool->lock, irq_flags); |
| 716 | if (npages) |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 717 | ttm_page_pool_free(pool, npages, false); |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 718 | } |
| 719 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 720 | /* |
| 721 | * On success pages list will hold count number of correctly |
| 722 | * cached pages. |
| 723 | */ |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 724 | static int ttm_get_pages(struct page **pages, unsigned npages, int flags, |
| 725 | enum ttm_caching_state cstate) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 726 | { |
| 727 | struct ttm_page_pool *pool = ttm_get_pool(flags, cstate); |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 728 | struct list_head plist; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 729 | struct page *p = NULL; |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 730 | gfp_t gfp_flags = GFP_USER; |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 731 | unsigned count; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 732 | int r; |
| 733 | |
| 734 | /* set zero flag for page allocation if required */ |
| 735 | if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) |
| 736 | gfp_flags |= __GFP_ZERO; |
| 737 | |
| 738 | /* No pool for cached pages */ |
| 739 | if (pool == NULL) { |
| 740 | if (flags & TTM_PAGE_FLAG_DMA32) |
| 741 | gfp_flags |= GFP_DMA32; |
| 742 | else |
Thomas Hellstrom | e8613c0 | 2010-05-26 16:21:03 +0200 | [diff] [blame] | 743 | gfp_flags |= GFP_HIGHUSER; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 744 | |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 745 | for (r = 0; r < npages; ++r) { |
Dave Airlie | d87dfdb | 2011-04-13 09:15:09 +1000 | [diff] [blame] | 746 | p = alloc_page(gfp_flags); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 747 | if (!p) { |
| 748 | |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 749 | pr_err("Unable to allocate page\n"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 750 | return -ENOMEM; |
| 751 | } |
Dave Airlie | d87dfdb | 2011-04-13 09:15:09 +1000 | [diff] [blame] | 752 | |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 753 | pages[r] = p; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 754 | } |
| 755 | return 0; |
| 756 | } |
| 757 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 758 | /* combine zero flag to pool flags */ |
| 759 | gfp_flags |= pool->gfp_flags; |
| 760 | |
| 761 | /* First we take pages from the pool */ |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 762 | INIT_LIST_HEAD(&plist); |
| 763 | npages = ttm_page_pool_get_pages(pool, &plist, flags, cstate, npages); |
| 764 | count = 0; |
| 765 | list_for_each_entry(p, &plist, lru) { |
| 766 | pages[count++] = p; |
| 767 | } |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 768 | |
| 769 | /* clear the pages coming from the pool if requested */ |
| 770 | if (flags & TTM_PAGE_FLAG_ZERO_ALLOC) { |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 771 | list_for_each_entry(p, &plist, lru) { |
Zhao Yakui | ac207ed | 2012-11-13 18:31:55 +0000 | [diff] [blame] | 772 | if (PageHighMem(p)) |
| 773 | clear_highpage(p); |
| 774 | else |
| 775 | clear_page(page_address(p)); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 776 | } |
| 777 | } |
| 778 | |
| 779 | /* If pool didn't have enough pages allocate new one. */ |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 780 | if (npages > 0) { |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 781 | /* ttm_alloc_new_pages doesn't reference pool so we can run |
| 782 | * multiple requests in parallel. |
| 783 | **/ |
Jerome Glisse | 822c4d9 | 2011-11-10 18:24:09 -0500 | [diff] [blame] | 784 | INIT_LIST_HEAD(&plist); |
| 785 | r = ttm_alloc_new_pages(&plist, gfp_flags, flags, cstate, npages); |
| 786 | list_for_each_entry(p, &plist, lru) { |
| 787 | pages[count++] = p; |
| 788 | } |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 789 | if (r) { |
| 790 | /* If there is any pages in the list put them back to |
| 791 | * the pool. */ |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 792 | pr_err("Failed to allocate extra pages for large request\n"); |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 793 | ttm_put_pages(pages, count, flags, cstate); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 794 | return r; |
| 795 | } |
| 796 | } |
| 797 | |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 798 | return 0; |
| 799 | } |
| 800 | |
Dave Airlie | 3b9c214 | 2014-07-22 12:55:39 +1000 | [diff] [blame] | 801 | static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, gfp_t flags, |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 802 | char *name) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 803 | { |
| 804 | spin_lock_init(&pool->lock); |
| 805 | pool->fill_lock = false; |
| 806 | INIT_LIST_HEAD(&pool->list); |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 807 | pool->npages = pool->nfrees = 0; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 808 | pool->gfp_flags = flags; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 809 | pool->name = name; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 810 | } |
| 811 | |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 812 | 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] | 813 | { |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 814 | int ret; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 815 | |
| 816 | WARN_ON(_manager); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 817 | |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 818 | pr_info("Initializing pool allocator\n"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 819 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 820 | _manager = kzalloc(sizeof(*_manager), GFP_KERNEL); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 821 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 822 | ttm_page_pool_init_locked(&_manager->wc_pool, GFP_HIGHUSER, "wc"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 823 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 824 | ttm_page_pool_init_locked(&_manager->uc_pool, GFP_HIGHUSER, "uc"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 825 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 826 | ttm_page_pool_init_locked(&_manager->wc_pool_dma32, |
| 827 | GFP_USER | GFP_DMA32, "wc dma"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 828 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 829 | ttm_page_pool_init_locked(&_manager->uc_pool_dma32, |
| 830 | GFP_USER | GFP_DMA32, "uc dma"); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 831 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 832 | _manager->options.max_size = max_pages; |
| 833 | _manager->options.small = SMALL_ALLOCATION; |
| 834 | _manager->options.alloc_size = NUM_PAGES_TO_ALLOC; |
| 835 | |
| 836 | ret = kobject_init_and_add(&_manager->kobj, &ttm_pool_kobj_type, |
| 837 | &glob->kobj, "pool"); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 838 | if (unlikely(ret != 0)) { |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 839 | kobject_put(&_manager->kobj); |
| 840 | _manager = NULL; |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 841 | return ret; |
| 842 | } |
| 843 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 844 | ttm_pool_mm_shrink_init(_manager); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 845 | |
| 846 | return 0; |
| 847 | } |
| 848 | |
Daniel J Blueman | 0e57a3c | 2010-09-22 17:45:45 +0100 | [diff] [blame] | 849 | void ttm_page_alloc_fini(void) |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 850 | { |
| 851 | int i; |
| 852 | |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 853 | pr_info("Finalizing pool allocator\n"); |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 854 | ttm_pool_mm_shrink_fini(_manager); |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 855 | |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 856 | /* OK to use static buffer since global mutex is no longer used. */ |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 857 | for (i = 0; i < NUM_POOLS; ++i) |
Tetsuo Handa | 881fdaa | 2014-11-13 22:43:23 +0900 | [diff] [blame^] | 858 | ttm_page_pool_free(&_manager->pools[i], FREE_ALL_PAGES, true); |
Pauli Nieminen | c96af79 | 2010-04-01 12:45:03 +0000 | [diff] [blame] | 859 | |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 860 | kobject_put(&_manager->kobj); |
| 861 | _manager = NULL; |
Pauli Nieminen | 1403b1a | 2010-04-01 12:44:57 +0000 | [diff] [blame] | 862 | } |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 863 | |
Jerome Glisse | b1e5f17 | 2011-11-02 23:59:28 -0400 | [diff] [blame] | 864 | int ttm_pool_populate(struct ttm_tt *ttm) |
| 865 | { |
| 866 | struct ttm_mem_global *mem_glob = ttm->glob->mem_glob; |
| 867 | unsigned i; |
| 868 | int ret; |
| 869 | |
| 870 | if (ttm->state != tt_unpopulated) |
| 871 | return 0; |
| 872 | |
| 873 | for (i = 0; i < ttm->num_pages; ++i) { |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 874 | ret = ttm_get_pages(&ttm->pages[i], 1, |
| 875 | ttm->page_flags, |
| 876 | ttm->caching_state); |
Jerome Glisse | b1e5f17 | 2011-11-02 23:59:28 -0400 | [diff] [blame] | 877 | if (ret != 0) { |
| 878 | ttm_pool_unpopulate(ttm); |
| 879 | return -ENOMEM; |
| 880 | } |
| 881 | |
| 882 | ret = ttm_mem_global_alloc_page(mem_glob, ttm->pages[i], |
| 883 | false, false); |
| 884 | if (unlikely(ret != 0)) { |
| 885 | ttm_pool_unpopulate(ttm); |
| 886 | return -ENOMEM; |
| 887 | } |
| 888 | } |
| 889 | |
| 890 | if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) { |
| 891 | ret = ttm_tt_swapin(ttm); |
| 892 | if (unlikely(ret != 0)) { |
| 893 | ttm_pool_unpopulate(ttm); |
| 894 | return ret; |
| 895 | } |
| 896 | } |
| 897 | |
| 898 | ttm->state = tt_unbound; |
| 899 | return 0; |
| 900 | } |
| 901 | EXPORT_SYMBOL(ttm_pool_populate); |
| 902 | |
| 903 | void ttm_pool_unpopulate(struct ttm_tt *ttm) |
| 904 | { |
| 905 | unsigned i; |
| 906 | |
| 907 | for (i = 0; i < ttm->num_pages; ++i) { |
| 908 | if (ttm->pages[i]) { |
| 909 | ttm_mem_global_free_page(ttm->glob->mem_glob, |
| 910 | ttm->pages[i]); |
| 911 | ttm_put_pages(&ttm->pages[i], 1, |
| 912 | ttm->page_flags, |
Jerome Glisse | 8e7e705 | 2011-11-09 17:15:26 -0500 | [diff] [blame] | 913 | ttm->caching_state); |
Jerome Glisse | b1e5f17 | 2011-11-02 23:59:28 -0400 | [diff] [blame] | 914 | } |
| 915 | } |
| 916 | ttm->state = tt_unpopulated; |
| 917 | } |
| 918 | EXPORT_SYMBOL(ttm_pool_unpopulate); |
| 919 | |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 920 | int ttm_page_alloc_debugfs(struct seq_file *m, void *data) |
| 921 | { |
| 922 | struct ttm_page_pool *p; |
| 923 | unsigned i; |
| 924 | char *h[] = {"pool", "refills", "pages freed", "size"}; |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 925 | if (!_manager) { |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 926 | seq_printf(m, "No pool allocator running.\n"); |
| 927 | return 0; |
| 928 | } |
| 929 | seq_printf(m, "%6s %12s %13s %8s\n", |
| 930 | h[0], h[1], h[2], h[3]); |
| 931 | for (i = 0; i < NUM_POOLS; ++i) { |
Francisco Jerez | 5870a4d | 2010-07-04 04:03:07 +0200 | [diff] [blame] | 932 | p = &_manager->pools[i]; |
Pauli Nieminen | 0745866 | 2010-04-01 12:44:58 +0000 | [diff] [blame] | 933 | |
| 934 | seq_printf(m, "%6s %12ld %13ld %8d\n", |
| 935 | p->name, p->nrefills, |
| 936 | p->nfrees, p->npages); |
| 937 | } |
| 938 | return 0; |
| 939 | } |
| 940 | EXPORT_SYMBOL(ttm_page_alloc_debugfs); |