Blame view
mm/dmapool.c
13 KB
6182a0943 dmapool: Tidy up ... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
/* * DMA Pool allocator * * Copyright 2001 David Brownell * Copyright 2007 Intel Corporation * Author: Matthew Wilcox <willy@linux.intel.com> * * This software may be redistributed and/or modified under the terms of * the GNU General Public License ("GPL") version 2 as published by the * Free Software Foundation. * * This allocator returns small blocks of a given size which are DMA-able by * the given device. It uses the dma_alloc_coherent page allocator to get * new pages, then splits them up into blocks of the required size. * Many older drivers still have their own code to do this. * * The current design of this allocator is fairly simple. The pool is * represented by the 'struct dma_pool' which keeps a doubly-linked list of * allocated pages. Each page in the page_list is split into blocks of at |
a35a34551 Change dmapool fr... |
20 21 22 |
* least 'size' bytes. Free blocks are tracked in an unsorted singly-linked * list of free blocks within the page. Used blocks aren't tracked, but we * keep a count of how many are currently allocated from each page. |
6182a0943 dmapool: Tidy up ... |
23 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
24 25 |
#include <linux/device.h> |
1da177e4c Linux-2.6.12-rc2 |
26 27 |
#include <linux/dma-mapping.h> #include <linux/dmapool.h> |
6182a0943 dmapool: Tidy up ... |
28 29 |
#include <linux/kernel.h> #include <linux/list.h> |
b95f1b31b mm: Map most file... |
30 |
#include <linux/export.h> |
6182a0943 dmapool: Tidy up ... |
31 |
#include <linux/mutex.h> |
c9cf55285 [PATCH] add poiso... |
32 |
#include <linux/poison.h> |
e8edc6e03 Detach sched.h fr... |
33 |
#include <linux/sched.h> |
6182a0943 dmapool: Tidy up ... |
34 |
#include <linux/slab.h> |
7c77509c5 mm: fix implicit ... |
35 |
#include <linux/stat.h> |
6182a0943 dmapool: Tidy up ... |
36 37 38 39 |
#include <linux/spinlock.h> #include <linux/string.h> #include <linux/types.h> #include <linux/wait.h> |
1da177e4c Linux-2.6.12-rc2 |
40 |
|
b5ee5befa dmapool: enable d... |
41 42 43 |
#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB_DEBUG_ON) #define DMAPOOL_DEBUG 1 #endif |
e87aa7737 dmapool: Fix styl... |
44 45 46 |
struct dma_pool { /* the pool */ struct list_head page_list; spinlock_t lock; |
e87aa7737 dmapool: Fix styl... |
47 48 49 |
size_t size; struct device *dev; size_t allocation; |
e34f44b35 pool: Improve mem... |
50 |
size_t boundary; |
e87aa7737 dmapool: Fix styl... |
51 52 53 |
char name[32]; wait_queue_head_t waitq; struct list_head pools; |
1da177e4c Linux-2.6.12-rc2 |
54 |
}; |
e87aa7737 dmapool: Fix styl... |
55 56 57 58 |
struct dma_page { /* cacheable header for 'allocation' bytes */ struct list_head page_list; void *vaddr; dma_addr_t dma; |
a35a34551 Change dmapool fr... |
59 60 |
unsigned int in_use; unsigned int offset; |
1da177e4c Linux-2.6.12-rc2 |
61 62 63 |
}; #define POOL_TIMEOUT_JIFFIES ((100 /* msec */ * HZ) / 1000) |
1da177e4c Linux-2.6.12-rc2 |
64 |
|
e87aa7737 dmapool: Fix styl... |
65 |
static DEFINE_MUTEX(pools_lock); |
1da177e4c Linux-2.6.12-rc2 |
66 67 |
static ssize_t |
e87aa7737 dmapool: Fix styl... |
68 |
show_pools(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4c Linux-2.6.12-rc2 |
69 70 71 72 73 74 75 76 77 78 79 80 81 82 |
{ unsigned temp; unsigned size; char *next; struct dma_page *page; struct dma_pool *pool; next = buf; size = PAGE_SIZE; temp = scnprintf(next, size, "poolinfo - 0.1 "); size -= temp; next += temp; |
b2366d68d Driver core: use ... |
83 |
mutex_lock(&pools_lock); |
1da177e4c Linux-2.6.12-rc2 |
84 85 86 |
list_for_each_entry(pool, &dev->dma_pools, pools) { unsigned pages = 0; unsigned blocks = 0; |
c49568235 dmapools: protect... |
87 |
spin_lock_irq(&pool->lock); |
1da177e4c Linux-2.6.12-rc2 |
88 89 90 91 |
list_for_each_entry(page, &pool->page_list, page_list) { pages++; blocks += page->in_use; } |
c49568235 dmapools: protect... |
92 |
spin_unlock_irq(&pool->lock); |
1da177e4c Linux-2.6.12-rc2 |
93 94 95 96 |
/* per-pool info, no real statistics yet */ temp = scnprintf(next, size, "%-16s %4u %4Zu %4Zu %2u ", |
a35a34551 Change dmapool fr... |
97 98 |
pool->name, blocks, pages * (pool->allocation / pool->size), |
e87aa7737 dmapool: Fix styl... |
99 |
pool->size, pages); |
1da177e4c Linux-2.6.12-rc2 |
100 101 102 |
size -= temp; next += temp; } |
b2366d68d Driver core: use ... |
103 |
mutex_unlock(&pools_lock); |
1da177e4c Linux-2.6.12-rc2 |
104 105 106 |
return PAGE_SIZE - size; } |
e87aa7737 dmapool: Fix styl... |
107 108 |
static DEVICE_ATTR(pools, S_IRUGO, show_pools, NULL); |
1da177e4c Linux-2.6.12-rc2 |
109 110 111 112 113 114 115 |
/** * dma_pool_create - Creates a pool of consistent memory blocks, for dma. * @name: name of pool, for diagnostics * @dev: device that will be doing the DMA * @size: size of the blocks in this pool. * @align: alignment requirement for blocks; must be a power of two |
e34f44b35 pool: Improve mem... |
116 |
* @boundary: returned blocks won't cross this power of two boundary |
1da177e4c Linux-2.6.12-rc2 |
117 118 119 120 121 122 123 124 125 |
* Context: !in_interrupt() * * Returns a dma allocation pool with the requested characteristics, or * null if one can't be created. Given one of these pools, dma_pool_alloc() * may be used to allocate memory. Such memory will all have "consistent" * DMA mappings, accessible by the device and its driver without using * cache flushing primitives. The actual size of blocks allocated may be * larger than requested because of alignment. * |
e34f44b35 pool: Improve mem... |
126 |
* If @boundary is nonzero, objects returned from dma_pool_alloc() won't |
1da177e4c Linux-2.6.12-rc2 |
127 128 129 130 |
* cross that size boundary. This is useful for devices which have * addressing restrictions on individual DMA transfers, such as not crossing * boundaries of 4KBytes. */ |
e87aa7737 dmapool: Fix styl... |
131 |
struct dma_pool *dma_pool_create(const char *name, struct device *dev, |
e34f44b35 pool: Improve mem... |
132 |
size_t size, size_t align, size_t boundary) |
1da177e4c Linux-2.6.12-rc2 |
133 |
{ |
e87aa7737 dmapool: Fix styl... |
134 |
struct dma_pool *retval; |
e34f44b35 pool: Improve mem... |
135 |
size_t allocation; |
1da177e4c Linux-2.6.12-rc2 |
136 |
|
399154be2 dmapool: Validate... |
137 |
if (align == 0) { |
1da177e4c Linux-2.6.12-rc2 |
138 |
align = 1; |
399154be2 dmapool: Validate... |
139 |
} else if (align & (align - 1)) { |
1da177e4c Linux-2.6.12-rc2 |
140 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
141 |
} |
a35a34551 Change dmapool fr... |
142 |
if (size == 0) { |
399154be2 dmapool: Validate... |
143 |
return NULL; |
a35a34551 Change dmapool fr... |
144 145 146 |
} else if (size < 4) { size = 4; } |
399154be2 dmapool: Validate... |
147 148 149 |
if ((size % align) != 0) size = ALIGN(size, align); |
e34f44b35 pool: Improve mem... |
150 151 152 153 154 |
allocation = max_t(size_t, size, PAGE_SIZE); if (!boundary) { boundary = allocation; } else if ((boundary < size) || (boundary & (boundary - 1))) { |
1da177e4c Linux-2.6.12-rc2 |
155 |
return NULL; |
e34f44b35 pool: Improve mem... |
156 |
} |
1da177e4c Linux-2.6.12-rc2 |
157 |
|
e34f44b35 pool: Improve mem... |
158 159 |
retval = kmalloc_node(sizeof(*retval), GFP_KERNEL, dev_to_node(dev)); if (!retval) |
1da177e4c Linux-2.6.12-rc2 |
160 |
return retval; |
e34f44b35 pool: Improve mem... |
161 |
strlcpy(retval->name, name, sizeof(retval->name)); |
1da177e4c Linux-2.6.12-rc2 |
162 163 |
retval->dev = dev; |
e87aa7737 dmapool: Fix styl... |
164 165 |
INIT_LIST_HEAD(&retval->page_list); spin_lock_init(&retval->lock); |
1da177e4c Linux-2.6.12-rc2 |
166 |
retval->size = size; |
e34f44b35 pool: Improve mem... |
167 |
retval->boundary = boundary; |
1da177e4c Linux-2.6.12-rc2 |
168 |
retval->allocation = allocation; |
e87aa7737 dmapool: Fix styl... |
169 |
init_waitqueue_head(&retval->waitq); |
1da177e4c Linux-2.6.12-rc2 |
170 171 |
if (dev) { |
141ecc532 driver core fixes... |
172 |
int ret; |
b2366d68d Driver core: use ... |
173 |
mutex_lock(&pools_lock); |
e87aa7737 dmapool: Fix styl... |
174 175 |
if (list_empty(&dev->dma_pools)) ret = device_create_file(dev, &dev_attr_pools); |
141ecc532 driver core fixes... |
176 177 |
else ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
178 |
/* note: not currently insisting "name" be unique */ |
141ecc532 driver core fixes... |
179 |
if (!ret) |
e87aa7737 dmapool: Fix styl... |
180 |
list_add(&retval->pools, &dev->dma_pools); |
141ecc532 driver core fixes... |
181 182 183 184 |
else { kfree(retval); retval = NULL; } |
b2366d68d Driver core: use ... |
185 |
mutex_unlock(&pools_lock); |
1da177e4c Linux-2.6.12-rc2 |
186 |
} else |
e87aa7737 dmapool: Fix styl... |
187 |
INIT_LIST_HEAD(&retval->pools); |
1da177e4c Linux-2.6.12-rc2 |
188 189 190 |
return retval; } |
e87aa7737 dmapool: Fix styl... |
191 |
EXPORT_SYMBOL(dma_pool_create); |
1da177e4c Linux-2.6.12-rc2 |
192 |
|
a35a34551 Change dmapool fr... |
193 194 195 |
static void pool_initialise_page(struct dma_pool *pool, struct dma_page *page) { unsigned int offset = 0; |
e34f44b35 pool: Improve mem... |
196 |
unsigned int next_boundary = pool->boundary; |
a35a34551 Change dmapool fr... |
197 198 199 |
do { unsigned int next = offset + pool->size; |
e34f44b35 pool: Improve mem... |
200 201 202 203 |
if (unlikely((next + pool->size) >= next_boundary)) { next = next_boundary; next_boundary += pool->boundary; } |
a35a34551 Change dmapool fr... |
204 205 206 207 |
*(int *)(page->vaddr + offset) = next; offset = next; } while (offset < pool->allocation); } |
e87aa7737 dmapool: Fix styl... |
208 |
static struct dma_page *pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags) |
1da177e4c Linux-2.6.12-rc2 |
209 |
{ |
e87aa7737 dmapool: Fix styl... |
210 |
struct dma_page *page; |
1da177e4c Linux-2.6.12-rc2 |
211 |
|
a35a34551 Change dmapool fr... |
212 |
page = kmalloc(sizeof(*page), mem_flags); |
1da177e4c Linux-2.6.12-rc2 |
213 214 |
if (!page) return NULL; |
a35a34551 Change dmapool fr... |
215 |
page->vaddr = dma_alloc_coherent(pool->dev, pool->allocation, |
e87aa7737 dmapool: Fix styl... |
216 |
&page->dma, mem_flags); |
1da177e4c Linux-2.6.12-rc2 |
217 |
if (page->vaddr) { |
b5ee5befa dmapool: enable d... |
218 |
#ifdef DMAPOOL_DEBUG |
e87aa7737 dmapool: Fix styl... |
219 |
memset(page->vaddr, POOL_POISON_FREED, pool->allocation); |
1da177e4c Linux-2.6.12-rc2 |
220 |
#endif |
a35a34551 Change dmapool fr... |
221 |
pool_initialise_page(pool, page); |
e87aa7737 dmapool: Fix styl... |
222 |
list_add(&page->page_list, &pool->page_list); |
1da177e4c Linux-2.6.12-rc2 |
223 |
page->in_use = 0; |
a35a34551 Change dmapool fr... |
224 |
page->offset = 0; |
1da177e4c Linux-2.6.12-rc2 |
225 |
} else { |
e87aa7737 dmapool: Fix styl... |
226 |
kfree(page); |
1da177e4c Linux-2.6.12-rc2 |
227 228 229 230 |
page = NULL; } return page; } |
a35a34551 Change dmapool fr... |
231 |
static inline int is_page_busy(struct dma_page *page) |
1da177e4c Linux-2.6.12-rc2 |
232 |
{ |
a35a34551 Change dmapool fr... |
233 |
return page->in_use != 0; |
1da177e4c Linux-2.6.12-rc2 |
234 |
} |
e87aa7737 dmapool: Fix styl... |
235 |
static void pool_free_page(struct dma_pool *pool, struct dma_page *page) |
1da177e4c Linux-2.6.12-rc2 |
236 |
{ |
e87aa7737 dmapool: Fix styl... |
237 |
dma_addr_t dma = page->dma; |
1da177e4c Linux-2.6.12-rc2 |
238 |
|
b5ee5befa dmapool: enable d... |
239 |
#ifdef DMAPOOL_DEBUG |
e87aa7737 dmapool: Fix styl... |
240 |
memset(page->vaddr, POOL_POISON_FREED, pool->allocation); |
1da177e4c Linux-2.6.12-rc2 |
241 |
#endif |
e87aa7737 dmapool: Fix styl... |
242 243 244 |
dma_free_coherent(pool->dev, pool->allocation, page->vaddr, dma); list_del(&page->page_list); kfree(page); |
1da177e4c Linux-2.6.12-rc2 |
245 |
} |
1da177e4c Linux-2.6.12-rc2 |
246 247 248 249 250 251 252 253 |
/** * dma_pool_destroy - destroys a pool of dma memory blocks. * @pool: dma pool that will be destroyed * Context: !in_interrupt() * * Caller guarantees that no more memory from the pool is in use, * and that nothing will try to use the pool after this call. */ |
e87aa7737 dmapool: Fix styl... |
254 |
void dma_pool_destroy(struct dma_pool *pool) |
1da177e4c Linux-2.6.12-rc2 |
255 |
{ |
b2366d68d Driver core: use ... |
256 |
mutex_lock(&pools_lock); |
e87aa7737 dmapool: Fix styl... |
257 258 259 |
list_del(&pool->pools); if (pool->dev && list_empty(&pool->dev->dma_pools)) device_remove_file(pool->dev, &dev_attr_pools); |
b2366d68d Driver core: use ... |
260 |
mutex_unlock(&pools_lock); |
1da177e4c Linux-2.6.12-rc2 |
261 |
|
e87aa7737 dmapool: Fix styl... |
262 263 264 265 |
while (!list_empty(&pool->page_list)) { struct dma_page *page; page = list_entry(pool->page_list.next, struct dma_page, page_list); |
a35a34551 Change dmapool fr... |
266 |
if (is_page_busy(page)) { |
1da177e4c Linux-2.6.12-rc2 |
267 |
if (pool->dev) |
e87aa7737 dmapool: Fix styl... |
268 269 270 |
dev_err(pool->dev, "dma_pool_destroy %s, %p busy ", |
1da177e4c Linux-2.6.12-rc2 |
271 272 |
pool->name, page->vaddr); else |
e87aa7737 dmapool: Fix styl... |
273 274 275 276 |
printk(KERN_ERR "dma_pool_destroy %s, %p busy ", pool->name, page->vaddr); |
1da177e4c Linux-2.6.12-rc2 |
277 |
/* leak the still-in-use consistent memory */ |
e87aa7737 dmapool: Fix styl... |
278 279 |
list_del(&page->page_list); kfree(page); |
1da177e4c Linux-2.6.12-rc2 |
280 |
} else |
e87aa7737 dmapool: Fix styl... |
281 |
pool_free_page(pool, page); |
1da177e4c Linux-2.6.12-rc2 |
282 |
} |
e87aa7737 dmapool: Fix styl... |
283 |
kfree(pool); |
1da177e4c Linux-2.6.12-rc2 |
284 |
} |
e87aa7737 dmapool: Fix styl... |
285 |
EXPORT_SYMBOL(dma_pool_destroy); |
1da177e4c Linux-2.6.12-rc2 |
286 287 288 289 290 291 292 293 294 |
/** * dma_pool_alloc - get a block of consistent memory * @pool: dma pool that will produce the block * @mem_flags: GFP_* bitmask * @handle: pointer to dma address of block * * This returns the kernel virtual address of a currently unused block, * and reports its dma address through the handle. |
6182a0943 dmapool: Tidy up ... |
295 |
* If such a memory block can't be allocated, %NULL is returned. |
1da177e4c Linux-2.6.12-rc2 |
296 |
*/ |
e87aa7737 dmapool: Fix styl... |
297 298 |
void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle) |
1da177e4c Linux-2.6.12-rc2 |
299 |
{ |
e87aa7737 dmapool: Fix styl... |
300 301 |
unsigned long flags; struct dma_page *page; |
e87aa7737 dmapool: Fix styl... |
302 303 |
size_t offset; void *retval; |
ea05c8444 mm: add a might_s... |
304 |
might_sleep_if(mem_flags & __GFP_WAIT); |
e87aa7737 dmapool: Fix styl... |
305 |
spin_lock_irqsave(&pool->lock, flags); |
2cae367e4 Avoid taking wait... |
306 |
restart: |
1da177e4c Linux-2.6.12-rc2 |
307 |
list_for_each_entry(page, &pool->page_list, page_list) { |
a35a34551 Change dmapool fr... |
308 309 |
if (page->offset < pool->allocation) goto ready; |
1da177e4c Linux-2.6.12-rc2 |
310 |
} |
e87aa7737 dmapool: Fix styl... |
311 312 |
page = pool_alloc_page(pool, GFP_ATOMIC); if (!page) { |
1da177e4c Linux-2.6.12-rc2 |
313 |
if (mem_flags & __GFP_WAIT) { |
e87aa7737 dmapool: Fix styl... |
314 |
DECLARE_WAITQUEUE(wait, current); |
1da177e4c Linux-2.6.12-rc2 |
315 |
|
684265d4a mm/dmapool.c: use... |
316 |
__set_current_state(TASK_UNINTERRUPTIBLE); |
2cae367e4 Avoid taking wait... |
317 |
__add_wait_queue(&pool->waitq, &wait); |
e87aa7737 dmapool: Fix styl... |
318 |
spin_unlock_irqrestore(&pool->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
319 |
|
e87aa7737 dmapool: Fix styl... |
320 |
schedule_timeout(POOL_TIMEOUT_JIFFIES); |
1da177e4c Linux-2.6.12-rc2 |
321 |
|
2cae367e4 Avoid taking wait... |
322 323 |
spin_lock_irqsave(&pool->lock, flags); __remove_wait_queue(&pool->waitq, &wait); |
1da177e4c Linux-2.6.12-rc2 |
324 325 326 327 328 |
goto restart; } retval = NULL; goto done; } |
e87aa7737 dmapool: Fix styl... |
329 |
ready: |
1da177e4c Linux-2.6.12-rc2 |
330 |
page->in_use++; |
a35a34551 Change dmapool fr... |
331 332 |
offset = page->offset; page->offset = *(int *)(page->vaddr + offset); |
1da177e4c Linux-2.6.12-rc2 |
333 334 |
retval = offset + page->vaddr; *handle = offset + page->dma; |
b5ee5befa dmapool: enable d... |
335 |
#ifdef DMAPOOL_DEBUG |
e87aa7737 dmapool: Fix styl... |
336 |
memset(retval, POOL_POISON_ALLOCATED, pool->size); |
1da177e4c Linux-2.6.12-rc2 |
337 |
#endif |
e87aa7737 dmapool: Fix styl... |
338 339 |
done: spin_unlock_irqrestore(&pool->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
340 341 |
return retval; } |
e87aa7737 dmapool: Fix styl... |
342 |
EXPORT_SYMBOL(dma_pool_alloc); |
1da177e4c Linux-2.6.12-rc2 |
343 |
|
e87aa7737 dmapool: Fix styl... |
344 |
static struct dma_page *pool_find_page(struct dma_pool *pool, dma_addr_t dma) |
1da177e4c Linux-2.6.12-rc2 |
345 |
{ |
e87aa7737 dmapool: Fix styl... |
346 |
struct dma_page *page; |
1da177e4c Linux-2.6.12-rc2 |
347 |
|
1da177e4c Linux-2.6.12-rc2 |
348 349 350 351 |
list_for_each_entry(page, &pool->page_list, page_list) { if (dma < page->dma) continue; if (dma < (page->dma + pool->allocation)) |
84bc227d7 mm/dmapool.c: tak... |
352 |
return page; |
1da177e4c Linux-2.6.12-rc2 |
353 |
} |
84bc227d7 mm/dmapool.c: tak... |
354 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
355 |
} |
1da177e4c Linux-2.6.12-rc2 |
356 357 358 359 360 361 362 363 364 |
/** * dma_pool_free - put block back into dma pool * @pool: the dma pool holding the block * @vaddr: virtual address of block * @dma: dma address of block * * Caller promises neither device nor driver will again touch this block * unless it is first re-allocated. */ |
e87aa7737 dmapool: Fix styl... |
365 |
void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t dma) |
1da177e4c Linux-2.6.12-rc2 |
366 |
{ |
e87aa7737 dmapool: Fix styl... |
367 368 |
struct dma_page *page; unsigned long flags; |
a35a34551 Change dmapool fr... |
369 |
unsigned int offset; |
1da177e4c Linux-2.6.12-rc2 |
370 |
|
84bc227d7 mm/dmapool.c: tak... |
371 |
spin_lock_irqsave(&pool->lock, flags); |
e87aa7737 dmapool: Fix styl... |
372 373 |
page = pool_find_page(pool, dma); if (!page) { |
84bc227d7 mm/dmapool.c: tak... |
374 |
spin_unlock_irqrestore(&pool->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
375 |
if (pool->dev) |
e87aa7737 dmapool: Fix styl... |
376 377 378 379 |
dev_err(pool->dev, "dma_pool_free %s, %p/%lx (bad dma) ", pool->name, vaddr, (unsigned long)dma); |
1da177e4c Linux-2.6.12-rc2 |
380 |
else |
e87aa7737 dmapool: Fix styl... |
381 382 383 |
printk(KERN_ERR "dma_pool_free %s, %p/%lx (bad dma) ", pool->name, vaddr, (unsigned long)dma); |
1da177e4c Linux-2.6.12-rc2 |
384 385 |
return; } |
a35a34551 Change dmapool fr... |
386 |
offset = vaddr - page->vaddr; |
b5ee5befa dmapool: enable d... |
387 |
#ifdef DMAPOOL_DEBUG |
a35a34551 Change dmapool fr... |
388 |
if ((dma - page->dma) != offset) { |
84bc227d7 mm/dmapool.c: tak... |
389 |
spin_unlock_irqrestore(&pool->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
390 |
if (pool->dev) |
e87aa7737 dmapool: Fix styl... |
391 392 393 394 |
dev_err(pool->dev, "dma_pool_free %s, %p (bad vaddr)/%Lx ", pool->name, vaddr, (unsigned long long)dma); |
1da177e4c Linux-2.6.12-rc2 |
395 |
else |
e87aa7737 dmapool: Fix styl... |
396 397 398 399 |
printk(KERN_ERR "dma_pool_free %s, %p (bad vaddr)/%Lx ", pool->name, vaddr, (unsigned long long)dma); |
1da177e4c Linux-2.6.12-rc2 |
400 401 |
return; } |
a35a34551 Change dmapool fr... |
402 403 404 405 406 407 408 |
{ unsigned int chain = page->offset; while (chain < pool->allocation) { if (chain != offset) { chain = *(int *)(page->vaddr + chain); continue; } |
84bc227d7 mm/dmapool.c: tak... |
409 |
spin_unlock_irqrestore(&pool->lock, flags); |
a35a34551 Change dmapool fr... |
410 411 412 413 414 415 416 417 418 419 420 421 |
if (pool->dev) dev_err(pool->dev, "dma_pool_free %s, dma %Lx " "already free ", pool->name, (unsigned long long)dma); else printk(KERN_ERR "dma_pool_free %s, dma %Lx " "already free ", pool->name, (unsigned long long)dma); return; } |
1da177e4c Linux-2.6.12-rc2 |
422 |
} |
e87aa7737 dmapool: Fix styl... |
423 |
memset(vaddr, POOL_POISON_FREED, pool->size); |
1da177e4c Linux-2.6.12-rc2 |
424 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
425 |
page->in_use--; |
a35a34551 Change dmapool fr... |
426 427 |
*(int *)vaddr = page->offset; page->offset = offset; |
e87aa7737 dmapool: Fix styl... |
428 |
if (waitqueue_active(&pool->waitq)) |
2cae367e4 Avoid taking wait... |
429 |
wake_up_locked(&pool->waitq); |
1da177e4c Linux-2.6.12-rc2 |
430 431 |
/* * Resist a temptation to do |
a35a34551 Change dmapool fr... |
432 |
* if (!is_page_busy(page)) pool_free_page(pool, page); |
1da177e4c Linux-2.6.12-rc2 |
433 434 |
* Better have a few empty pages hang around. */ |
e87aa7737 dmapool: Fix styl... |
435 |
spin_unlock_irqrestore(&pool->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
436 |
} |
e87aa7737 dmapool: Fix styl... |
437 |
EXPORT_SYMBOL(dma_pool_free); |
1da177e4c Linux-2.6.12-rc2 |
438 |
|
9ac7849e3 devres: device re... |
439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 |
/* * Managed DMA pool */ static void dmam_pool_release(struct device *dev, void *res) { struct dma_pool *pool = *(struct dma_pool **)res; dma_pool_destroy(pool); } static int dmam_pool_match(struct device *dev, void *res, void *match_data) { return *(struct dma_pool **)res == match_data; } /** * dmam_pool_create - Managed dma_pool_create() * @name: name of pool, for diagnostics * @dev: device that will be doing the DMA * @size: size of the blocks in this pool. * @align: alignment requirement for blocks; must be a power of two * @allocation: returned blocks won't cross this boundary (or zero) * * Managed dma_pool_create(). DMA pool created with this function is * automatically destroyed on driver detach. */ struct dma_pool *dmam_pool_create(const char *name, struct device *dev, size_t size, size_t align, size_t allocation) { struct dma_pool **ptr, *pool; ptr = devres_alloc(dmam_pool_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) return NULL; pool = *ptr = dma_pool_create(name, dev, size, align, allocation); if (pool) devres_add(dev, ptr); else devres_free(ptr); return pool; } |
e87aa7737 dmapool: Fix styl... |
482 |
EXPORT_SYMBOL(dmam_pool_create); |
9ac7849e3 devres: device re... |
483 484 485 486 487 488 489 490 491 492 |
/** * dmam_pool_destroy - Managed dma_pool_destroy() * @pool: dma pool that will be destroyed * * Managed dma_pool_destroy(). */ void dmam_pool_destroy(struct dma_pool *pool) { struct device *dev = pool->dev; |
9ac7849e3 devres: device re... |
493 |
WARN_ON(devres_destroy(dev, dmam_pool_release, dmam_pool_match, pool)); |
ae891a1b9 devres: fix possi... |
494 |
dma_pool_destroy(pool); |
9ac7849e3 devres: device re... |
495 |
} |
e87aa7737 dmapool: Fix styl... |
496 |
EXPORT_SYMBOL(dmam_pool_destroy); |