Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the Free |
| 6 | * Software Foundation; either version 2 of the License, or (at your option) |
| 7 | * any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 59 |
| 16 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | * |
| 18 | * The full GNU General Public License is included in this distribution in the |
| 19 | * file called COPYING. |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * This code implements the DMA subsystem. It provides a HW-neutral interface |
| 24 | * for other kernel code to use asynchronous memory copy capabilities, |
| 25 | * if present, and allows different HW DMA drivers to register as providing |
| 26 | * this capability. |
| 27 | * |
| 28 | * Due to the fact we are accelerating what is already a relatively fast |
| 29 | * operation, the code goes to great lengths to avoid additional overhead, |
| 30 | * such as locking. |
| 31 | * |
| 32 | * LOCKING: |
| 33 | * |
| 34 | * The subsystem keeps two global lists, dma_device_list and dma_client_list. |
| 35 | * Both of these are protected by a mutex, dma_list_mutex. |
| 36 | * |
| 37 | * Each device has a channels list, which runs unlocked but is never modified |
| 38 | * once the device is registered, it's just setup by the driver. |
| 39 | * |
| 40 | * Each client has a channels list, it's only modified under the client->lock |
| 41 | * and in an RCU callback, so it's safe to read under rcu_read_lock(). |
| 42 | * |
| 43 | * Each device has a kref, which is initialized to 1 when the device is |
| 44 | * registered. A kref_put is done for each class_device registered. When the |
| 45 | * class_device is released, the coresponding kref_put is done in the release |
| 46 | * method. Every time one of the device's channels is allocated to a client, |
| 47 | * a kref_get occurs. When the channel is freed, the coresponding kref_put |
| 48 | * happens. The device's release function does a completion, so |
| 49 | * unregister_device does a remove event, class_device_unregister, a kref_put |
| 50 | * for the first reference, then waits on the completion for all other |
| 51 | * references to finish. |
| 52 | * |
| 53 | * Each channel has an open-coded implementation of Rusty Russell's "bigref," |
| 54 | * with a kref and a per_cpu local_t. A single reference is set when on an |
| 55 | * ADDED event, and removed with a REMOVE event. Net DMA client takes an |
| 56 | * extra reference per outstanding transaction. The relase function does a |
| 57 | * kref_put on the device. -ChrisL |
| 58 | */ |
| 59 | |
| 60 | #include <linux/init.h> |
| 61 | #include <linux/module.h> |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame^] | 62 | #include <linux/mm.h> |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 63 | #include <linux/device.h> |
| 64 | #include <linux/dmaengine.h> |
| 65 | #include <linux/hardirq.h> |
| 66 | #include <linux/spinlock.h> |
| 67 | #include <linux/percpu.h> |
| 68 | #include <linux/rcupdate.h> |
| 69 | #include <linux/mutex.h> |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame^] | 70 | #include <linux/jiffies.h> |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 71 | |
| 72 | static DEFINE_MUTEX(dma_list_mutex); |
| 73 | static LIST_HEAD(dma_device_list); |
| 74 | static LIST_HEAD(dma_client_list); |
| 75 | |
| 76 | /* --- sysfs implementation --- */ |
| 77 | |
| 78 | static ssize_t show_memcpy_count(struct class_device *cd, char *buf) |
| 79 | { |
| 80 | struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev); |
| 81 | unsigned long count = 0; |
| 82 | int i; |
| 83 | |
Andrew Morton | 17f3ae0 | 2006-05-25 13:26:53 -0700 | [diff] [blame] | 84 | for_each_possible_cpu(i) |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 85 | count += per_cpu_ptr(chan->local, i)->memcpy_count; |
| 86 | |
| 87 | return sprintf(buf, "%lu\n", count); |
| 88 | } |
| 89 | |
| 90 | static ssize_t show_bytes_transferred(struct class_device *cd, char *buf) |
| 91 | { |
| 92 | struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev); |
| 93 | unsigned long count = 0; |
| 94 | int i; |
| 95 | |
Andrew Morton | 17f3ae0 | 2006-05-25 13:26:53 -0700 | [diff] [blame] | 96 | for_each_possible_cpu(i) |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 97 | count += per_cpu_ptr(chan->local, i)->bytes_transferred; |
| 98 | |
| 99 | return sprintf(buf, "%lu\n", count); |
| 100 | } |
| 101 | |
| 102 | static ssize_t show_in_use(struct class_device *cd, char *buf) |
| 103 | { |
| 104 | struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev); |
| 105 | |
| 106 | return sprintf(buf, "%d\n", (chan->client ? 1 : 0)); |
| 107 | } |
| 108 | |
| 109 | static struct class_device_attribute dma_class_attrs[] = { |
| 110 | __ATTR(memcpy_count, S_IRUGO, show_memcpy_count, NULL), |
| 111 | __ATTR(bytes_transferred, S_IRUGO, show_bytes_transferred, NULL), |
| 112 | __ATTR(in_use, S_IRUGO, show_in_use, NULL), |
| 113 | __ATTR_NULL |
| 114 | }; |
| 115 | |
| 116 | static void dma_async_device_cleanup(struct kref *kref); |
| 117 | |
| 118 | static void dma_class_dev_release(struct class_device *cd) |
| 119 | { |
| 120 | struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev); |
| 121 | kref_put(&chan->device->refcount, dma_async_device_cleanup); |
| 122 | } |
| 123 | |
| 124 | static struct class dma_devclass = { |
| 125 | .name = "dma", |
| 126 | .class_dev_attrs = dma_class_attrs, |
| 127 | .release = dma_class_dev_release, |
| 128 | }; |
| 129 | |
| 130 | /* --- client and device registration --- */ |
| 131 | |
| 132 | /** |
| 133 | * dma_client_chan_alloc - try to allocate a channel to a client |
| 134 | * @client: &dma_client |
| 135 | * |
| 136 | * Called with dma_list_mutex held. |
| 137 | */ |
| 138 | static struct dma_chan *dma_client_chan_alloc(struct dma_client *client) |
| 139 | { |
| 140 | struct dma_device *device; |
| 141 | struct dma_chan *chan; |
| 142 | unsigned long flags; |
| 143 | int desc; /* allocated descriptor count */ |
| 144 | |
| 145 | /* Find a channel, any DMA engine will do */ |
| 146 | list_for_each_entry(device, &dma_device_list, global_node) { |
| 147 | list_for_each_entry(chan, &device->channels, device_node) { |
| 148 | if (chan->client) |
| 149 | continue; |
| 150 | |
| 151 | desc = chan->device->device_alloc_chan_resources(chan); |
| 152 | if (desc >= 0) { |
| 153 | kref_get(&device->refcount); |
| 154 | kref_init(&chan->refcount); |
| 155 | chan->slow_ref = 0; |
| 156 | INIT_RCU_HEAD(&chan->rcu); |
| 157 | chan->client = client; |
| 158 | spin_lock_irqsave(&client->lock, flags); |
| 159 | list_add_tail_rcu(&chan->client_node, |
| 160 | &client->channels); |
| 161 | spin_unlock_irqrestore(&client->lock, flags); |
| 162 | return chan; |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | return NULL; |
| 168 | } |
| 169 | |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame^] | 170 | enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie) |
| 171 | { |
| 172 | enum dma_status status; |
| 173 | unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); |
| 174 | |
| 175 | dma_async_issue_pending(chan); |
| 176 | do { |
| 177 | status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); |
| 178 | if (time_after_eq(jiffies, dma_sync_wait_timeout)) { |
| 179 | printk(KERN_ERR "dma_sync_wait_timeout!\n"); |
| 180 | return DMA_ERROR; |
| 181 | } |
| 182 | } while (status == DMA_IN_PROGRESS); |
| 183 | |
| 184 | return status; |
| 185 | } |
| 186 | EXPORT_SYMBOL(dma_sync_wait); |
| 187 | |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 188 | /** |
Randy Dunlap | 6508871 | 2006-07-03 19:45:31 -0700 | [diff] [blame] | 189 | * dma_chan_cleanup - release a DMA channel's resources |
| 190 | * @kref: kernel reference structure that contains the DMA channel device |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 191 | */ |
| 192 | void dma_chan_cleanup(struct kref *kref) |
| 193 | { |
| 194 | struct dma_chan *chan = container_of(kref, struct dma_chan, refcount); |
| 195 | chan->device->device_free_chan_resources(chan); |
| 196 | chan->client = NULL; |
| 197 | kref_put(&chan->device->refcount, dma_async_device_cleanup); |
| 198 | } |
David Brownell | 765e3d8 | 2007-03-16 13:38:05 -0800 | [diff] [blame] | 199 | EXPORT_SYMBOL(dma_chan_cleanup); |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 200 | |
| 201 | static void dma_chan_free_rcu(struct rcu_head *rcu) |
| 202 | { |
| 203 | struct dma_chan *chan = container_of(rcu, struct dma_chan, rcu); |
| 204 | int bias = 0x7FFFFFFF; |
| 205 | int i; |
Andrew Morton | 17f3ae0 | 2006-05-25 13:26:53 -0700 | [diff] [blame] | 206 | for_each_possible_cpu(i) |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 207 | bias -= local_read(&per_cpu_ptr(chan->local, i)->refcount); |
| 208 | atomic_sub(bias, &chan->refcount.refcount); |
| 209 | kref_put(&chan->refcount, dma_chan_cleanup); |
| 210 | } |
| 211 | |
| 212 | static void dma_client_chan_free(struct dma_chan *chan) |
| 213 | { |
| 214 | atomic_add(0x7FFFFFFF, &chan->refcount.refcount); |
| 215 | chan->slow_ref = 1; |
| 216 | call_rcu(&chan->rcu, dma_chan_free_rcu); |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * dma_chans_rebalance - reallocate channels to clients |
| 221 | * |
| 222 | * When the number of DMA channel in the system changes, |
Randy Dunlap | 6508871 | 2006-07-03 19:45:31 -0700 | [diff] [blame] | 223 | * channels need to be rebalanced among clients. |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 224 | */ |
| 225 | static void dma_chans_rebalance(void) |
| 226 | { |
| 227 | struct dma_client *client; |
| 228 | struct dma_chan *chan; |
| 229 | unsigned long flags; |
| 230 | |
| 231 | mutex_lock(&dma_list_mutex); |
| 232 | |
| 233 | list_for_each_entry(client, &dma_client_list, global_node) { |
| 234 | while (client->chans_desired > client->chan_count) { |
| 235 | chan = dma_client_chan_alloc(client); |
| 236 | if (!chan) |
| 237 | break; |
| 238 | client->chan_count++; |
| 239 | client->event_callback(client, |
| 240 | chan, |
| 241 | DMA_RESOURCE_ADDED); |
| 242 | } |
| 243 | while (client->chans_desired < client->chan_count) { |
| 244 | spin_lock_irqsave(&client->lock, flags); |
| 245 | chan = list_entry(client->channels.next, |
| 246 | struct dma_chan, |
| 247 | client_node); |
| 248 | list_del_rcu(&chan->client_node); |
| 249 | spin_unlock_irqrestore(&client->lock, flags); |
| 250 | client->chan_count--; |
| 251 | client->event_callback(client, |
| 252 | chan, |
| 253 | DMA_RESOURCE_REMOVED); |
| 254 | dma_client_chan_free(chan); |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | mutex_unlock(&dma_list_mutex); |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * dma_async_client_register - allocate and register a &dma_client |
| 263 | * @event_callback: callback for notification of channel addition/removal |
| 264 | */ |
| 265 | struct dma_client *dma_async_client_register(dma_event_callback event_callback) |
| 266 | { |
| 267 | struct dma_client *client; |
| 268 | |
| 269 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
| 270 | if (!client) |
| 271 | return NULL; |
| 272 | |
| 273 | INIT_LIST_HEAD(&client->channels); |
| 274 | spin_lock_init(&client->lock); |
| 275 | client->chans_desired = 0; |
| 276 | client->chan_count = 0; |
| 277 | client->event_callback = event_callback; |
| 278 | |
| 279 | mutex_lock(&dma_list_mutex); |
| 280 | list_add_tail(&client->global_node, &dma_client_list); |
| 281 | mutex_unlock(&dma_list_mutex); |
| 282 | |
| 283 | return client; |
| 284 | } |
David Brownell | 765e3d8 | 2007-03-16 13:38:05 -0800 | [diff] [blame] | 285 | EXPORT_SYMBOL(dma_async_client_register); |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 286 | |
| 287 | /** |
| 288 | * dma_async_client_unregister - unregister a client and free the &dma_client |
Randy Dunlap | 6508871 | 2006-07-03 19:45:31 -0700 | [diff] [blame] | 289 | * @client: &dma_client to free |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 290 | * |
| 291 | * Force frees any allocated DMA channels, frees the &dma_client memory |
| 292 | */ |
| 293 | void dma_async_client_unregister(struct dma_client *client) |
| 294 | { |
| 295 | struct dma_chan *chan; |
| 296 | |
| 297 | if (!client) |
| 298 | return; |
| 299 | |
| 300 | rcu_read_lock(); |
| 301 | list_for_each_entry_rcu(chan, &client->channels, client_node) |
| 302 | dma_client_chan_free(chan); |
| 303 | rcu_read_unlock(); |
| 304 | |
| 305 | mutex_lock(&dma_list_mutex); |
| 306 | list_del(&client->global_node); |
| 307 | mutex_unlock(&dma_list_mutex); |
| 308 | |
| 309 | kfree(client); |
| 310 | dma_chans_rebalance(); |
| 311 | } |
David Brownell | 765e3d8 | 2007-03-16 13:38:05 -0800 | [diff] [blame] | 312 | EXPORT_SYMBOL(dma_async_client_unregister); |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 313 | |
| 314 | /** |
| 315 | * dma_async_client_chan_request - request DMA channels |
| 316 | * @client: &dma_client |
| 317 | * @number: count of DMA channels requested |
| 318 | * |
| 319 | * Clients call dma_async_client_chan_request() to specify how many |
| 320 | * DMA channels they need, 0 to free all currently allocated. |
| 321 | * The resulting allocations/frees are indicated to the client via the |
| 322 | * event callback. |
| 323 | */ |
| 324 | void dma_async_client_chan_request(struct dma_client *client, |
| 325 | unsigned int number) |
| 326 | { |
| 327 | client->chans_desired = number; |
| 328 | dma_chans_rebalance(); |
| 329 | } |
David Brownell | 765e3d8 | 2007-03-16 13:38:05 -0800 | [diff] [blame] | 330 | EXPORT_SYMBOL(dma_async_client_chan_request); |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 331 | |
| 332 | /** |
Randy Dunlap | 6508871 | 2006-07-03 19:45:31 -0700 | [diff] [blame] | 333 | * dma_async_device_register - registers DMA devices found |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 334 | * @device: &dma_device |
| 335 | */ |
| 336 | int dma_async_device_register(struct dma_device *device) |
| 337 | { |
| 338 | static int id; |
Jeff Garzik | ff487fb | 2007-03-08 09:57:34 -0800 | [diff] [blame] | 339 | int chancnt = 0, rc; |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 340 | struct dma_chan* chan; |
| 341 | |
| 342 | if (!device) |
| 343 | return -ENODEV; |
| 344 | |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame^] | 345 | /* validate device routines */ |
| 346 | BUG_ON(dma_has_cap(DMA_MEMCPY, device->cap_mask) && |
| 347 | !device->device_prep_dma_memcpy); |
| 348 | BUG_ON(dma_has_cap(DMA_XOR, device->cap_mask) && |
| 349 | !device->device_prep_dma_xor); |
| 350 | BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) && |
| 351 | !device->device_prep_dma_zero_sum); |
| 352 | BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) && |
| 353 | !device->device_prep_dma_memset); |
| 354 | BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) && |
| 355 | !device->device_prep_dma_interrupt); |
| 356 | |
| 357 | BUG_ON(!device->device_alloc_chan_resources); |
| 358 | BUG_ON(!device->device_free_chan_resources); |
| 359 | BUG_ON(!device->device_dependency_added); |
| 360 | BUG_ON(!device->device_is_tx_complete); |
| 361 | BUG_ON(!device->device_issue_pending); |
| 362 | BUG_ON(!device->dev); |
| 363 | |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 364 | init_completion(&device->done); |
| 365 | kref_init(&device->refcount); |
| 366 | device->dev_id = id++; |
| 367 | |
| 368 | /* represent channels in sysfs. Probably want devs too */ |
| 369 | list_for_each_entry(chan, &device->channels, device_node) { |
| 370 | chan->local = alloc_percpu(typeof(*chan->local)); |
| 371 | if (chan->local == NULL) |
| 372 | continue; |
| 373 | |
| 374 | chan->chan_id = chancnt++; |
| 375 | chan->class_dev.class = &dma_devclass; |
| 376 | chan->class_dev.dev = NULL; |
| 377 | snprintf(chan->class_dev.class_id, BUS_ID_SIZE, "dma%dchan%d", |
| 378 | device->dev_id, chan->chan_id); |
| 379 | |
Jeff Garzik | ff487fb | 2007-03-08 09:57:34 -0800 | [diff] [blame] | 380 | rc = class_device_register(&chan->class_dev); |
| 381 | if (rc) { |
| 382 | chancnt--; |
| 383 | free_percpu(chan->local); |
| 384 | chan->local = NULL; |
| 385 | goto err_out; |
| 386 | } |
| 387 | |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 388 | kref_get(&device->refcount); |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | mutex_lock(&dma_list_mutex); |
| 392 | list_add_tail(&device->global_node, &dma_device_list); |
| 393 | mutex_unlock(&dma_list_mutex); |
| 394 | |
| 395 | dma_chans_rebalance(); |
| 396 | |
| 397 | return 0; |
Jeff Garzik | ff487fb | 2007-03-08 09:57:34 -0800 | [diff] [blame] | 398 | |
| 399 | err_out: |
| 400 | list_for_each_entry(chan, &device->channels, device_node) { |
| 401 | if (chan->local == NULL) |
| 402 | continue; |
| 403 | kref_put(&device->refcount, dma_async_device_cleanup); |
| 404 | class_device_unregister(&chan->class_dev); |
| 405 | chancnt--; |
| 406 | free_percpu(chan->local); |
| 407 | } |
| 408 | return rc; |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 409 | } |
David Brownell | 765e3d8 | 2007-03-16 13:38:05 -0800 | [diff] [blame] | 410 | EXPORT_SYMBOL(dma_async_device_register); |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 411 | |
| 412 | /** |
Randy Dunlap | 6508871 | 2006-07-03 19:45:31 -0700 | [diff] [blame] | 413 | * dma_async_device_cleanup - function called when all references are released |
| 414 | * @kref: kernel reference object |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 415 | */ |
| 416 | static void dma_async_device_cleanup(struct kref *kref) |
| 417 | { |
| 418 | struct dma_device *device; |
| 419 | |
| 420 | device = container_of(kref, struct dma_device, refcount); |
| 421 | complete(&device->done); |
| 422 | } |
| 423 | |
Randy Dunlap | 6508871 | 2006-07-03 19:45:31 -0700 | [diff] [blame] | 424 | /** |
| 425 | * dma_async_device_unregister - unregisters DMA devices |
| 426 | * @device: &dma_device |
| 427 | */ |
| 428 | void dma_async_device_unregister(struct dma_device *device) |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 429 | { |
| 430 | struct dma_chan *chan; |
| 431 | unsigned long flags; |
| 432 | |
| 433 | mutex_lock(&dma_list_mutex); |
| 434 | list_del(&device->global_node); |
| 435 | mutex_unlock(&dma_list_mutex); |
| 436 | |
| 437 | list_for_each_entry(chan, &device->channels, device_node) { |
| 438 | if (chan->client) { |
| 439 | spin_lock_irqsave(&chan->client->lock, flags); |
| 440 | list_del(&chan->client_node); |
| 441 | chan->client->chan_count--; |
| 442 | spin_unlock_irqrestore(&chan->client->lock, flags); |
| 443 | chan->client->event_callback(chan->client, |
| 444 | chan, |
| 445 | DMA_RESOURCE_REMOVED); |
| 446 | dma_client_chan_free(chan); |
| 447 | } |
| 448 | class_device_unregister(&chan->class_dev); |
| 449 | } |
| 450 | dma_chans_rebalance(); |
| 451 | |
| 452 | kref_put(&device->refcount, dma_async_device_cleanup); |
| 453 | wait_for_completion(&device->done); |
| 454 | } |
David Brownell | 765e3d8 | 2007-03-16 13:38:05 -0800 | [diff] [blame] | 455 | EXPORT_SYMBOL(dma_async_device_unregister); |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 456 | |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame^] | 457 | /** |
| 458 | * dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses |
| 459 | * @chan: DMA channel to offload copy to |
| 460 | * @dest: destination address (virtual) |
| 461 | * @src: source address (virtual) |
| 462 | * @len: length |
| 463 | * |
| 464 | * Both @dest and @src must be mappable to a bus address according to the |
| 465 | * DMA mapping API rules for streaming mappings. |
| 466 | * Both @dest and @src must stay memory resident (kernel memory or locked |
| 467 | * user space pages). |
| 468 | */ |
| 469 | dma_cookie_t |
| 470 | dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest, |
| 471 | void *src, size_t len) |
| 472 | { |
| 473 | struct dma_device *dev = chan->device; |
| 474 | struct dma_async_tx_descriptor *tx; |
| 475 | dma_addr_t addr; |
| 476 | dma_cookie_t cookie; |
| 477 | int cpu; |
| 478 | |
| 479 | tx = dev->device_prep_dma_memcpy(chan, len, 0); |
| 480 | if (!tx) |
| 481 | return -ENOMEM; |
| 482 | |
| 483 | tx->ack = 1; |
| 484 | tx->callback = NULL; |
| 485 | addr = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE); |
| 486 | tx->tx_set_src(addr, tx, 0); |
| 487 | addr = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE); |
| 488 | tx->tx_set_dest(addr, tx, 0); |
| 489 | cookie = tx->tx_submit(tx); |
| 490 | |
| 491 | cpu = get_cpu(); |
| 492 | per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; |
| 493 | per_cpu_ptr(chan->local, cpu)->memcpy_count++; |
| 494 | put_cpu(); |
| 495 | |
| 496 | return cookie; |
| 497 | } |
| 498 | EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf); |
| 499 | |
| 500 | /** |
| 501 | * dma_async_memcpy_buf_to_pg - offloaded copy from address to page |
| 502 | * @chan: DMA channel to offload copy to |
| 503 | * @page: destination page |
| 504 | * @offset: offset in page to copy to |
| 505 | * @kdata: source address (virtual) |
| 506 | * @len: length |
| 507 | * |
| 508 | * Both @page/@offset and @kdata must be mappable to a bus address according |
| 509 | * to the DMA mapping API rules for streaming mappings. |
| 510 | * Both @page/@offset and @kdata must stay memory resident (kernel memory or |
| 511 | * locked user space pages) |
| 512 | */ |
| 513 | dma_cookie_t |
| 514 | dma_async_memcpy_buf_to_pg(struct dma_chan *chan, struct page *page, |
| 515 | unsigned int offset, void *kdata, size_t len) |
| 516 | { |
| 517 | struct dma_device *dev = chan->device; |
| 518 | struct dma_async_tx_descriptor *tx; |
| 519 | dma_addr_t addr; |
| 520 | dma_cookie_t cookie; |
| 521 | int cpu; |
| 522 | |
| 523 | tx = dev->device_prep_dma_memcpy(chan, len, 0); |
| 524 | if (!tx) |
| 525 | return -ENOMEM; |
| 526 | |
| 527 | tx->ack = 1; |
| 528 | tx->callback = NULL; |
| 529 | addr = dma_map_single(dev->dev, kdata, len, DMA_TO_DEVICE); |
| 530 | tx->tx_set_src(addr, tx, 0); |
| 531 | addr = dma_map_page(dev->dev, page, offset, len, DMA_FROM_DEVICE); |
| 532 | tx->tx_set_dest(addr, tx, 0); |
| 533 | cookie = tx->tx_submit(tx); |
| 534 | |
| 535 | cpu = get_cpu(); |
| 536 | per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; |
| 537 | per_cpu_ptr(chan->local, cpu)->memcpy_count++; |
| 538 | put_cpu(); |
| 539 | |
| 540 | return cookie; |
| 541 | } |
| 542 | EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg); |
| 543 | |
| 544 | /** |
| 545 | * dma_async_memcpy_pg_to_pg - offloaded copy from page to page |
| 546 | * @chan: DMA channel to offload copy to |
| 547 | * @dest_pg: destination page |
| 548 | * @dest_off: offset in page to copy to |
| 549 | * @src_pg: source page |
| 550 | * @src_off: offset in page to copy from |
| 551 | * @len: length |
| 552 | * |
| 553 | * Both @dest_page/@dest_off and @src_page/@src_off must be mappable to a bus |
| 554 | * address according to the DMA mapping API rules for streaming mappings. |
| 555 | * Both @dest_page/@dest_off and @src_page/@src_off must stay memory resident |
| 556 | * (kernel memory or locked user space pages). |
| 557 | */ |
| 558 | dma_cookie_t |
| 559 | dma_async_memcpy_pg_to_pg(struct dma_chan *chan, struct page *dest_pg, |
| 560 | unsigned int dest_off, struct page *src_pg, unsigned int src_off, |
| 561 | size_t len) |
| 562 | { |
| 563 | struct dma_device *dev = chan->device; |
| 564 | struct dma_async_tx_descriptor *tx; |
| 565 | dma_addr_t addr; |
| 566 | dma_cookie_t cookie; |
| 567 | int cpu; |
| 568 | |
| 569 | tx = dev->device_prep_dma_memcpy(chan, len, 0); |
| 570 | if (!tx) |
| 571 | return -ENOMEM; |
| 572 | |
| 573 | tx->ack = 1; |
| 574 | tx->callback = NULL; |
| 575 | addr = dma_map_page(dev->dev, src_pg, src_off, len, DMA_TO_DEVICE); |
| 576 | tx->tx_set_src(addr, tx, 0); |
| 577 | addr = dma_map_page(dev->dev, dest_pg, dest_off, len, DMA_FROM_DEVICE); |
| 578 | tx->tx_set_dest(addr, tx, 0); |
| 579 | cookie = tx->tx_submit(tx); |
| 580 | |
| 581 | cpu = get_cpu(); |
| 582 | per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; |
| 583 | per_cpu_ptr(chan->local, cpu)->memcpy_count++; |
| 584 | put_cpu(); |
| 585 | |
| 586 | return cookie; |
| 587 | } |
| 588 | EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg); |
| 589 | |
| 590 | void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, |
| 591 | struct dma_chan *chan) |
| 592 | { |
| 593 | tx->chan = chan; |
| 594 | spin_lock_init(&tx->lock); |
| 595 | INIT_LIST_HEAD(&tx->depend_node); |
| 596 | INIT_LIST_HEAD(&tx->depend_list); |
| 597 | } |
| 598 | EXPORT_SYMBOL(dma_async_tx_descriptor_init); |
| 599 | |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 600 | static int __init dma_bus_init(void) |
| 601 | { |
| 602 | mutex_init(&dma_list_mutex); |
| 603 | return class_register(&dma_devclass); |
| 604 | } |
Chris Leech | c13c826 | 2006-05-23 17:18:44 -0700 | [diff] [blame] | 605 | subsys_initcall(dma_bus_init); |
| 606 | |