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authorLinus Torvalds <torvalds@linux-foundation.org>2009-01-09 14:52:14 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-09 14:52:14 -0500
commitd9e8a3a5b8298a3c814ed37ac5756e6f67b6be41 (patch)
treeffa1cf8b367b3f32155f6336d7b86b781a368019 /drivers/dma/dmatest.c
parent2150edc6c5cf00f7adb54538b9ea2a3e9cedca3f (diff)
parentb9bdcbba010c2e49c8f837ea7a49fe006b636f41 (diff)
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (22 commits) ioat: fix self test for multi-channel case dmaengine: bump initcall level to arch_initcall dmaengine: advertise all channels on a device to dma_filter_fn dmaengine: use idr for registering dma device numbers dmaengine: add a release for dma class devices and dependent infrastructure ioat: do not perform removal actions at shutdown iop-adma: enable module removal iop-adma: kill debug BUG_ON iop-adma: let devm do its job, don't duplicate free dmaengine: kill enum dma_state_client dmaengine: remove 'bigref' infrastructure dmaengine: kill struct dma_client and supporting infrastructure dmaengine: replace dma_async_client_register with dmaengine_get atmel-mci: convert to dma_request_channel and down-level dma_slave dmatest: convert to dma_request_channel dmaengine: introduce dma_request_channel and private channels net_dma: convert to dma_find_channel dmaengine: provide a common 'issue_pending_all' implementation dmaengine: centralize channel allocation, introduce dma_find_channel dmaengine: up-level reference counting to the module level ...
Diffstat (limited to 'drivers/dma/dmatest.c')
-rw-r--r--drivers/dma/dmatest.c129
1 files changed, 49 insertions, 80 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index ed9636bfb54a..3603f1ea5b28 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -35,7 +35,7 @@ MODULE_PARM_DESC(threads_per_chan,
35 35
36static unsigned int max_channels; 36static unsigned int max_channels;
37module_param(max_channels, uint, S_IRUGO); 37module_param(max_channels, uint, S_IRUGO);
38MODULE_PARM_DESC(nr_channels, 38MODULE_PARM_DESC(max_channels,
39 "Maximum number of channels to use (default: all)"); 39 "Maximum number of channels to use (default: all)");
40 40
41/* 41/*
@@ -71,7 +71,7 @@ struct dmatest_chan {
71 71
72/* 72/*
73 * These are protected by dma_list_mutex since they're only used by 73 * These are protected by dma_list_mutex since they're only used by
74 * the DMA client event callback 74 * the DMA filter function callback
75 */ 75 */
76static LIST_HEAD(dmatest_channels); 76static LIST_HEAD(dmatest_channels);
77static unsigned int nr_channels; 77static unsigned int nr_channels;
@@ -80,7 +80,7 @@ static bool dmatest_match_channel(struct dma_chan *chan)
80{ 80{
81 if (test_channel[0] == '\0') 81 if (test_channel[0] == '\0')
82 return true; 82 return true;
83 return strcmp(dev_name(&chan->dev), test_channel) == 0; 83 return strcmp(dma_chan_name(chan), test_channel) == 0;
84} 84}
85 85
86static bool dmatest_match_device(struct dma_device *device) 86static bool dmatest_match_device(struct dma_device *device)
@@ -215,7 +215,6 @@ static int dmatest_func(void *data)
215 215
216 smp_rmb(); 216 smp_rmb();
217 chan = thread->chan; 217 chan = thread->chan;
218 dma_chan_get(chan);
219 218
220 while (!kthread_should_stop()) { 219 while (!kthread_should_stop()) {
221 total_tests++; 220 total_tests++;
@@ -293,7 +292,6 @@ static int dmatest_func(void *data)
293 } 292 }
294 293
295 ret = 0; 294 ret = 0;
296 dma_chan_put(chan);
297 kfree(thread->dstbuf); 295 kfree(thread->dstbuf);
298err_dstbuf: 296err_dstbuf:
299 kfree(thread->srcbuf); 297 kfree(thread->srcbuf);
@@ -319,21 +317,16 @@ static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
319 kfree(dtc); 317 kfree(dtc);
320} 318}
321 319
322static enum dma_state_client dmatest_add_channel(struct dma_chan *chan) 320static int dmatest_add_channel(struct dma_chan *chan)
323{ 321{
324 struct dmatest_chan *dtc; 322 struct dmatest_chan *dtc;
325 struct dmatest_thread *thread; 323 struct dmatest_thread *thread;
326 unsigned int i; 324 unsigned int i;
327 325
328 /* Have we already been told about this channel? */
329 list_for_each_entry(dtc, &dmatest_channels, node)
330 if (dtc->chan == chan)
331 return DMA_DUP;
332
333 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL); 326 dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
334 if (!dtc) { 327 if (!dtc) {
335 pr_warning("dmatest: No memory for %s\n", dev_name(&chan->dev)); 328 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
336 return DMA_NAK; 329 return -ENOMEM;
337 } 330 }
338 331
339 dtc->chan = chan; 332 dtc->chan = chan;
@@ -343,16 +336,16 @@ static enum dma_state_client dmatest_add_channel(struct dma_chan *chan)
343 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL); 336 thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
344 if (!thread) { 337 if (!thread) {
345 pr_warning("dmatest: No memory for %s-test%u\n", 338 pr_warning("dmatest: No memory for %s-test%u\n",
346 dev_name(&chan->dev), i); 339 dma_chan_name(chan), i);
347 break; 340 break;
348 } 341 }
349 thread->chan = dtc->chan; 342 thread->chan = dtc->chan;
350 smp_wmb(); 343 smp_wmb();
351 thread->task = kthread_run(dmatest_func, thread, "%s-test%u", 344 thread->task = kthread_run(dmatest_func, thread, "%s-test%u",
352 dev_name(&chan->dev), i); 345 dma_chan_name(chan), i);
353 if (IS_ERR(thread->task)) { 346 if (IS_ERR(thread->task)) {
354 pr_warning("dmatest: Failed to run thread %s-test%u\n", 347 pr_warning("dmatest: Failed to run thread %s-test%u\n",
355 dev_name(&chan->dev), i); 348 dma_chan_name(chan), i);
356 kfree(thread); 349 kfree(thread);
357 break; 350 break;
358 } 351 }
@@ -362,86 +355,62 @@ static enum dma_state_client dmatest_add_channel(struct dma_chan *chan)
362 list_add_tail(&thread->node, &dtc->threads); 355 list_add_tail(&thread->node, &dtc->threads);
363 } 356 }
364 357
365 pr_info("dmatest: Started %u threads using %s\n", i, dev_name(&chan->dev)); 358 pr_info("dmatest: Started %u threads using %s\n", i, dma_chan_name(chan));
366 359
367 list_add_tail(&dtc->node, &dmatest_channels); 360 list_add_tail(&dtc->node, &dmatest_channels);
368 nr_channels++; 361 nr_channels++;
369 362
370 return DMA_ACK; 363 return 0;
371}
372
373static enum dma_state_client dmatest_remove_channel(struct dma_chan *chan)
374{
375 struct dmatest_chan *dtc, *_dtc;
376
377 list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
378 if (dtc->chan == chan) {
379 list_del(&dtc->node);
380 dmatest_cleanup_channel(dtc);
381 pr_debug("dmatest: lost channel %s\n",
382 dev_name(&chan->dev));
383 return DMA_ACK;
384 }
385 }
386
387 return DMA_DUP;
388} 364}
389 365
390/* 366static bool filter(struct dma_chan *chan, void *param)
391 * Start testing threads as new channels are assigned to us, and kill
392 * them when the channels go away.
393 *
394 * When we unregister the client, all channels are removed so this
395 * will also take care of cleaning things up when the module is
396 * unloaded.
397 */
398static enum dma_state_client
399dmatest_event(struct dma_client *client, struct dma_chan *chan,
400 enum dma_state state)
401{ 367{
402 enum dma_state_client ack = DMA_NAK; 368 if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device))
403 369 return false;
404 switch (state) { 370 else
405 case DMA_RESOURCE_AVAILABLE: 371 return true;
406 if (!dmatest_match_channel(chan)
407 || !dmatest_match_device(chan->device))
408 ack = DMA_DUP;
409 else if (max_channels && nr_channels >= max_channels)
410 ack = DMA_NAK;
411 else
412 ack = dmatest_add_channel(chan);
413 break;
414
415 case DMA_RESOURCE_REMOVED:
416 ack = dmatest_remove_channel(chan);
417 break;
418
419 default:
420 pr_info("dmatest: Unhandled event %u (%s)\n",
421 state, dev_name(&chan->dev));
422 break;
423 }
424
425 return ack;
426} 372}
427 373
428static struct dma_client dmatest_client = {
429 .event_callback = dmatest_event,
430};
431
432static int __init dmatest_init(void) 374static int __init dmatest_init(void)
433{ 375{
434 dma_cap_set(DMA_MEMCPY, dmatest_client.cap_mask); 376 dma_cap_mask_t mask;
435 dma_async_client_register(&dmatest_client); 377 struct dma_chan *chan;
436 dma_async_client_chan_request(&dmatest_client); 378 int err = 0;
379
380 dma_cap_zero(mask);
381 dma_cap_set(DMA_MEMCPY, mask);
382 for (;;) {
383 chan = dma_request_channel(mask, filter, NULL);
384 if (chan) {
385 err = dmatest_add_channel(chan);
386 if (err == 0)
387 continue;
388 else {
389 dma_release_channel(chan);
390 break; /* add_channel failed, punt */
391 }
392 } else
393 break; /* no more channels available */
394 if (max_channels && nr_channels >= max_channels)
395 break; /* we have all we need */
396 }
437 397
438 return 0; 398 return err;
439} 399}
440module_init(dmatest_init); 400/* when compiled-in wait for drivers to load first */
401late_initcall(dmatest_init);
441 402
442static void __exit dmatest_exit(void) 403static void __exit dmatest_exit(void)
443{ 404{
444 dma_async_client_unregister(&dmatest_client); 405 struct dmatest_chan *dtc, *_dtc;
406
407 list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
408 list_del(&dtc->node);
409 dmatest_cleanup_channel(dtc);
410 pr_debug("dmatest: dropped channel %s\n",
411 dma_chan_name(dtc->chan));
412 dma_release_channel(dtc->chan);
413 }
445} 414}
446module_exit(dmatest_exit); 415module_exit(dmatest_exit);
447 416