2 * DMA Engine test module
4 * Copyright (C) 2007 Atmel Corporation
5 * Copyright (C) 2013 Intel Corporation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/delay.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/dmaengine.h>
14 #include <linux/freezer.h>
15 #include <linux/init.h>
16 #include <linux/kthread.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/random.h>
20 #include <linux/slab.h>
21 #include <linux/wait.h>
22 #include <linux/ctype.h>
23 #include <linux/debugfs.h>
24 #include <linux/uaccess.h>
25 #include <linux/seq_file.h>
27 static unsigned int test_buf_size
= 16384;
28 module_param(test_buf_size
, uint
, S_IRUGO
);
29 MODULE_PARM_DESC(test_buf_size
, "Size of the memcpy test buffer");
31 static char test_channel
[20];
32 module_param_string(channel
, test_channel
, sizeof(test_channel
), S_IRUGO
);
33 MODULE_PARM_DESC(channel
, "Bus ID of the channel to test (default: any)");
35 static char test_device
[20];
36 module_param_string(device
, test_device
, sizeof(test_device
), S_IRUGO
);
37 MODULE_PARM_DESC(device
, "Bus ID of the DMA Engine to test (default: any)");
39 static unsigned int threads_per_chan
= 1;
40 module_param(threads_per_chan
, uint
, S_IRUGO
);
41 MODULE_PARM_DESC(threads_per_chan
,
42 "Number of threads to start per channel (default: 1)");
44 static unsigned int max_channels
;
45 module_param(max_channels
, uint
, S_IRUGO
);
46 MODULE_PARM_DESC(max_channels
,
47 "Maximum number of channels to use (default: all)");
49 static unsigned int iterations
;
50 module_param(iterations
, uint
, S_IRUGO
);
51 MODULE_PARM_DESC(iterations
,
52 "Iterations before stopping test (default: infinite)");
54 static unsigned int xor_sources
= 3;
55 module_param(xor_sources
, uint
, S_IRUGO
);
56 MODULE_PARM_DESC(xor_sources
,
57 "Number of xor source buffers (default: 3)");
59 static unsigned int pq_sources
= 3;
60 module_param(pq_sources
, uint
, S_IRUGO
);
61 MODULE_PARM_DESC(pq_sources
,
62 "Number of p+q source buffers (default: 3)");
64 static int timeout
= 3000;
65 module_param(timeout
, uint
, S_IRUGO
);
66 MODULE_PARM_DESC(timeout
, "Transfer Timeout in msec (default: 3000), "
67 "Pass -1 for infinite timeout");
70 * Initialization patterns. All bytes in the source buffer has bit 7
71 * set, all bytes in the destination buffer has bit 7 cleared.
73 * Bit 6 is set for all bytes which are to be copied by the DMA
74 * engine. Bit 5 is set for all bytes which are to be overwritten by
77 * The remaining bits are the inverse of a counter which increments by
78 * one for each byte address.
80 #define PATTERN_SRC 0x80
81 #define PATTERN_DST 0x00
82 #define PATTERN_COPY 0x40
83 #define PATTERN_OVERWRITE 0x20
84 #define PATTERN_COUNT_MASK 0x1f
88 struct dmatest_thread
{
89 struct list_head node
;
90 struct dmatest_info
*info
;
91 struct task_struct
*task
;
92 struct dma_chan
*chan
;
95 enum dma_transaction_type type
;
99 struct list_head node
;
100 struct dma_chan
*chan
;
101 struct list_head threads
;
105 * struct dmatest_params - test parameters.
106 * @buf_size: size of the memcpy test buffer
107 * @channel: bus ID of the channel to test
108 * @device: bus ID of the DMA Engine to test
109 * @threads_per_chan: number of threads to start per channel
110 * @max_channels: maximum number of channels to use
111 * @iterations: iterations before stopping test
112 * @xor_sources: number of xor source buffers
113 * @pq_sources: number of p+q source buffers
114 * @timeout: transfer timeout in msec, -1 for infinite timeout
116 struct dmatest_params
{
117 unsigned int buf_size
;
120 unsigned int threads_per_chan
;
121 unsigned int max_channels
;
122 unsigned int iterations
;
123 unsigned int xor_sources
;
124 unsigned int pq_sources
;
129 * struct dmatest_info - test information.
130 * @params: test parameters
131 * @lock: access protection to the fields of this structure
133 struct dmatest_info
{
134 /* Test parameters */
135 struct dmatest_params params
;
138 struct list_head channels
;
139 unsigned int nr_channels
;
142 /* debugfs related stuff */
144 struct dmatest_params dbgfs_params
;
147 static struct dmatest_info test_info
;
149 static bool dmatest_match_channel(struct dmatest_params
*params
,
150 struct dma_chan
*chan
)
152 if (params
->channel
[0] == '\0')
154 return strcmp(dma_chan_name(chan
), params
->channel
) == 0;
157 static bool dmatest_match_device(struct dmatest_params
*params
,
158 struct dma_device
*device
)
160 if (params
->device
[0] == '\0')
162 return strcmp(dev_name(device
->dev
), params
->device
) == 0;
165 static unsigned long dmatest_random(void)
169 get_random_bytes(&buf
, sizeof(buf
));
173 static void dmatest_init_srcs(u8
**bufs
, unsigned int start
, unsigned int len
,
174 unsigned int buf_size
)
179 for (; (buf
= *bufs
); bufs
++) {
180 for (i
= 0; i
< start
; i
++)
181 buf
[i
] = PATTERN_SRC
| (~i
& PATTERN_COUNT_MASK
);
182 for ( ; i
< start
+ len
; i
++)
183 buf
[i
] = PATTERN_SRC
| PATTERN_COPY
184 | (~i
& PATTERN_COUNT_MASK
);
185 for ( ; i
< buf_size
; i
++)
186 buf
[i
] = PATTERN_SRC
| (~i
& PATTERN_COUNT_MASK
);
191 static void dmatest_init_dsts(u8
**bufs
, unsigned int start
, unsigned int len
,
192 unsigned int buf_size
)
197 for (; (buf
= *bufs
); bufs
++) {
198 for (i
= 0; i
< start
; i
++)
199 buf
[i
] = PATTERN_DST
| (~i
& PATTERN_COUNT_MASK
);
200 for ( ; i
< start
+ len
; i
++)
201 buf
[i
] = PATTERN_DST
| PATTERN_OVERWRITE
202 | (~i
& PATTERN_COUNT_MASK
);
203 for ( ; i
< buf_size
; i
++)
204 buf
[i
] = PATTERN_DST
| (~i
& PATTERN_COUNT_MASK
);
208 static void dmatest_mismatch(u8 actual
, u8 pattern
, unsigned int index
,
209 unsigned int counter
, bool is_srcbuf
)
211 u8 diff
= actual
^ pattern
;
212 u8 expected
= pattern
| (~counter
& PATTERN_COUNT_MASK
);
213 const char *thread_name
= current
->comm
;
216 pr_warning("%s: srcbuf[0x%x] overwritten!"
217 " Expected %02x, got %02x\n",
218 thread_name
, index
, expected
, actual
);
219 else if ((pattern
& PATTERN_COPY
)
220 && (diff
& (PATTERN_COPY
| PATTERN_OVERWRITE
)))
221 pr_warning("%s: dstbuf[0x%x] not copied!"
222 " Expected %02x, got %02x\n",
223 thread_name
, index
, expected
, actual
);
224 else if (diff
& PATTERN_SRC
)
225 pr_warning("%s: dstbuf[0x%x] was copied!"
226 " Expected %02x, got %02x\n",
227 thread_name
, index
, expected
, actual
);
229 pr_warning("%s: dstbuf[0x%x] mismatch!"
230 " Expected %02x, got %02x\n",
231 thread_name
, index
, expected
, actual
);
234 static unsigned int dmatest_verify(u8
**bufs
, unsigned int start
,
235 unsigned int end
, unsigned int counter
, u8 pattern
,
239 unsigned int error_count
= 0;
243 unsigned int counter_orig
= counter
;
245 for (; (buf
= *bufs
); bufs
++) {
246 counter
= counter_orig
;
247 for (i
= start
; i
< end
; i
++) {
249 expected
= pattern
| (~counter
& PATTERN_COUNT_MASK
);
250 if (actual
!= expected
) {
251 if (error_count
< 32)
252 dmatest_mismatch(actual
, pattern
, i
,
260 if (error_count
> 32)
261 pr_warning("%s: %u errors suppressed\n",
262 current
->comm
, error_count
- 32);
267 /* poor man's completion - we want to use wait_event_freezable() on it */
268 struct dmatest_done
{
270 wait_queue_head_t
*wait
;
273 static void dmatest_callback(void *arg
)
275 struct dmatest_done
*done
= arg
;
278 wake_up_all(done
->wait
);
281 static inline void unmap_src(struct device
*dev
, dma_addr_t
*addr
, size_t len
,
285 dma_unmap_single(dev
, addr
[count
], len
, DMA_TO_DEVICE
);
288 static inline void unmap_dst(struct device
*dev
, dma_addr_t
*addr
, size_t len
,
292 dma_unmap_single(dev
, addr
[count
], len
, DMA_BIDIRECTIONAL
);
295 static unsigned int min_odd(unsigned int x
, unsigned int y
)
297 unsigned int val
= min(x
, y
);
299 return val
% 2 ? val
: val
- 1;
303 * This function repeatedly tests DMA transfers of various lengths and
304 * offsets for a given operation type until it is told to exit by
305 * kthread_stop(). There may be multiple threads running this function
306 * in parallel for a single channel, and there may be multiple channels
307 * being tested in parallel.
309 * Before each test, the source and destination buffer is initialized
310 * with a known pattern. This pattern is different depending on
311 * whether it's in an area which is supposed to be copied or
312 * overwritten, and different in the source and destination buffers.
313 * So if the DMA engine doesn't copy exactly what we tell it to copy,
316 static int dmatest_func(void *data
)
318 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait
);
319 struct dmatest_thread
*thread
= data
;
320 struct dmatest_done done
= { .wait
= &done_wait
};
321 struct dmatest_info
*info
;
322 struct dmatest_params
*params
;
323 struct dma_chan
*chan
;
324 struct dma_device
*dev
;
325 const char *thread_name
;
326 unsigned int src_off
, dst_off
, len
;
327 unsigned int error_count
;
328 unsigned int failed_tests
= 0;
329 unsigned int total_tests
= 0;
331 enum dma_status status
;
332 enum dma_ctrl_flags flags
;
339 thread_name
= current
->comm
;
346 params
= &info
->params
;
349 if (thread
->type
== DMA_MEMCPY
)
350 src_cnt
= dst_cnt
= 1;
351 else if (thread
->type
== DMA_XOR
) {
352 /* force odd to ensure dst = src */
353 src_cnt
= min_odd(params
->xor_sources
| 1, dev
->max_xor
);
355 } else if (thread
->type
== DMA_PQ
) {
356 /* force odd to ensure dst = src */
357 src_cnt
= min_odd(params
->pq_sources
| 1, dma_maxpq(dev
, 0));
360 pq_coefs
= kmalloc(params
->pq_sources
+1, GFP_KERNEL
);
362 goto err_thread_type
;
364 for (i
= 0; i
< src_cnt
; i
++)
367 goto err_thread_type
;
369 thread
->srcs
= kcalloc(src_cnt
+1, sizeof(u8
*), GFP_KERNEL
);
372 for (i
= 0; i
< src_cnt
; i
++) {
373 thread
->srcs
[i
] = kmalloc(params
->buf_size
, GFP_KERNEL
);
374 if (!thread
->srcs
[i
])
377 thread
->srcs
[i
] = NULL
;
379 thread
->dsts
= kcalloc(dst_cnt
+1, sizeof(u8
*), GFP_KERNEL
);
382 for (i
= 0; i
< dst_cnt
; i
++) {
383 thread
->dsts
[i
] = kmalloc(params
->buf_size
, GFP_KERNEL
);
384 if (!thread
->dsts
[i
])
387 thread
->dsts
[i
] = NULL
;
389 set_user_nice(current
, 10);
392 * src buffers are freed by the DMAEngine code with dma_unmap_single()
393 * dst buffers are freed by ourselves below
395 flags
= DMA_CTRL_ACK
| DMA_PREP_INTERRUPT
396 | DMA_COMPL_SKIP_DEST_UNMAP
| DMA_COMPL_SRC_UNMAP_SINGLE
;
398 while (!kthread_should_stop()
399 && !(params
->iterations
&& total_tests
>= params
->iterations
)) {
400 struct dma_async_tx_descriptor
*tx
= NULL
;
401 dma_addr_t dma_srcs
[src_cnt
];
402 dma_addr_t dma_dsts
[dst_cnt
];
407 /* honor alignment restrictions */
408 if (thread
->type
== DMA_MEMCPY
)
409 align
= dev
->copy_align
;
410 else if (thread
->type
== DMA_XOR
)
411 align
= dev
->xor_align
;
412 else if (thread
->type
== DMA_PQ
)
413 align
= dev
->pq_align
;
415 if (1 << align
> params
->buf_size
) {
416 pr_err("%u-byte buffer too small for %d-byte alignment\n",
417 params
->buf_size
, 1 << align
);
421 len
= dmatest_random() % params
->buf_size
+ 1;
422 len
= (len
>> align
) << align
;
425 src_off
= dmatest_random() % (params
->buf_size
- len
+ 1);
426 dst_off
= dmatest_random() % (params
->buf_size
- len
+ 1);
428 src_off
= (src_off
>> align
) << align
;
429 dst_off
= (dst_off
>> align
) << align
;
431 dmatest_init_srcs(thread
->srcs
, src_off
, len
, params
->buf_size
);
432 dmatest_init_dsts(thread
->dsts
, dst_off
, len
, params
->buf_size
);
434 for (i
= 0; i
< src_cnt
; i
++) {
435 u8
*buf
= thread
->srcs
[i
] + src_off
;
437 dma_srcs
[i
] = dma_map_single(dev
->dev
, buf
, len
,
439 ret
= dma_mapping_error(dev
->dev
, dma_srcs
[i
]);
441 unmap_src(dev
->dev
, dma_srcs
, len
, i
);
442 pr_warn("%s: #%u: mapping error %d with "
443 "src_off=0x%x len=0x%x\n",
444 thread_name
, total_tests
- 1, ret
,
450 /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
451 for (i
= 0; i
< dst_cnt
; i
++) {
452 dma_dsts
[i
] = dma_map_single(dev
->dev
, thread
->dsts
[i
],
455 ret
= dma_mapping_error(dev
->dev
, dma_dsts
[i
]);
457 unmap_src(dev
->dev
, dma_srcs
, len
, src_cnt
);
458 unmap_dst(dev
->dev
, dma_dsts
, params
->buf_size
,
460 pr_warn("%s: #%u: mapping error %d with "
461 "dst_off=0x%x len=0x%x\n",
462 thread_name
, total_tests
- 1, ret
,
463 dst_off
, params
->buf_size
);
469 if (thread
->type
== DMA_MEMCPY
)
470 tx
= dev
->device_prep_dma_memcpy(chan
,
471 dma_dsts
[0] + dst_off
,
474 else if (thread
->type
== DMA_XOR
)
475 tx
= dev
->device_prep_dma_xor(chan
,
476 dma_dsts
[0] + dst_off
,
479 else if (thread
->type
== DMA_PQ
) {
480 dma_addr_t dma_pq
[dst_cnt
];
482 for (i
= 0; i
< dst_cnt
; i
++)
483 dma_pq
[i
] = dma_dsts
[i
] + dst_off
;
484 tx
= dev
->device_prep_dma_pq(chan
, dma_pq
, dma_srcs
,
490 unmap_src(dev
->dev
, dma_srcs
, len
, src_cnt
);
491 unmap_dst(dev
->dev
, dma_dsts
, params
->buf_size
,
493 pr_warning("%s: #%u: prep error with src_off=0x%x "
494 "dst_off=0x%x len=0x%x\n",
495 thread_name
, total_tests
- 1,
496 src_off
, dst_off
, len
);
503 tx
->callback
= dmatest_callback
;
504 tx
->callback_param
= &done
;
505 cookie
= tx
->tx_submit(tx
);
507 if (dma_submit_error(cookie
)) {
508 pr_warning("%s: #%u: submit error %d with src_off=0x%x "
509 "dst_off=0x%x len=0x%x\n",
510 thread_name
, total_tests
- 1, cookie
,
511 src_off
, dst_off
, len
);
516 dma_async_issue_pending(chan
);
518 wait_event_freezable_timeout(done_wait
,
519 done
.done
|| kthread_should_stop(),
520 msecs_to_jiffies(params
->timeout
));
522 status
= dma_async_is_tx_complete(chan
, cookie
, NULL
, NULL
);
526 * We're leaving the timed out dma operation with
527 * dangling pointer to done_wait. To make this
528 * correct, we'll need to allocate wait_done for
529 * each test iteration and perform "who's gonna
530 * free it this time?" dancing. For now, just
533 pr_warning("%s: #%u: test timed out\n",
534 thread_name
, total_tests
- 1);
537 } else if (status
!= DMA_SUCCESS
) {
538 pr_warning("%s: #%u: got completion callback,"
539 " but status is \'%s\'\n",
540 thread_name
, total_tests
- 1,
541 status
== DMA_ERROR
? "error" : "in progress");
546 /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
547 unmap_dst(dev
->dev
, dma_dsts
, params
->buf_size
, dst_cnt
);
551 pr_debug("%s: verifying source buffer...\n", thread_name
);
552 error_count
+= dmatest_verify(thread
->srcs
, 0, src_off
,
553 0, PATTERN_SRC
, true);
554 error_count
+= dmatest_verify(thread
->srcs
, src_off
,
555 src_off
+ len
, src_off
,
556 PATTERN_SRC
| PATTERN_COPY
, true);
557 error_count
+= dmatest_verify(thread
->srcs
, src_off
+ len
,
558 params
->buf_size
, src_off
+ len
,
561 pr_debug("%s: verifying dest buffer...\n",
563 error_count
+= dmatest_verify(thread
->dsts
, 0, dst_off
,
564 0, PATTERN_DST
, false);
565 error_count
+= dmatest_verify(thread
->dsts
, dst_off
,
566 dst_off
+ len
, src_off
,
567 PATTERN_SRC
| PATTERN_COPY
, false);
568 error_count
+= dmatest_verify(thread
->dsts
, dst_off
+ len
,
569 params
->buf_size
, dst_off
+ len
,
573 pr_warning("%s: #%u: %u errors with "
574 "src_off=0x%x dst_off=0x%x len=0x%x\n",
575 thread_name
, total_tests
- 1, error_count
,
576 src_off
, dst_off
, len
);
579 pr_debug("%s: #%u: No errors with "
580 "src_off=0x%x dst_off=0x%x len=0x%x\n",
581 thread_name
, total_tests
- 1,
582 src_off
, dst_off
, len
);
587 for (i
= 0; thread
->dsts
[i
]; i
++)
588 kfree(thread
->dsts
[i
]);
592 for (i
= 0; thread
->srcs
[i
]; i
++)
593 kfree(thread
->srcs
[i
]);
599 pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
600 thread_name
, total_tests
, failed_tests
, ret
);
602 /* terminate all transfers on specified channels */
604 dmaengine_terminate_all(chan
);
606 if (params
->iterations
> 0)
607 while (!kthread_should_stop()) {
608 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit
);
609 interruptible_sleep_on(&wait_dmatest_exit
);
615 static void dmatest_cleanup_channel(struct dmatest_chan
*dtc
)
617 struct dmatest_thread
*thread
;
618 struct dmatest_thread
*_thread
;
621 list_for_each_entry_safe(thread
, _thread
, &dtc
->threads
, node
) {
622 ret
= kthread_stop(thread
->task
);
623 pr_debug("dmatest: thread %s exited with status %d\n",
624 thread
->task
->comm
, ret
);
625 list_del(&thread
->node
);
629 /* terminate all transfers on specified channels */
630 dmaengine_terminate_all(dtc
->chan
);
635 static int dmatest_add_threads(struct dmatest_info
*info
,
636 struct dmatest_chan
*dtc
, enum dma_transaction_type type
)
638 struct dmatest_params
*params
= &info
->params
;
639 struct dmatest_thread
*thread
;
640 struct dma_chan
*chan
= dtc
->chan
;
644 if (type
== DMA_MEMCPY
)
646 else if (type
== DMA_XOR
)
648 else if (type
== DMA_PQ
)
653 for (i
= 0; i
< params
->threads_per_chan
; i
++) {
654 thread
= kzalloc(sizeof(struct dmatest_thread
), GFP_KERNEL
);
656 pr_warning("dmatest: No memory for %s-%s%u\n",
657 dma_chan_name(chan
), op
, i
);
662 thread
->chan
= dtc
->chan
;
665 thread
->task
= kthread_run(dmatest_func
, thread
, "%s-%s%u",
666 dma_chan_name(chan
), op
, i
);
667 if (IS_ERR(thread
->task
)) {
668 pr_warning("dmatest: Failed to run thread %s-%s%u\n",
669 dma_chan_name(chan
), op
, i
);
674 /* srcbuf and dstbuf are allocated by the thread itself */
676 list_add_tail(&thread
->node
, &dtc
->threads
);
682 static int dmatest_add_channel(struct dmatest_info
*info
,
683 struct dma_chan
*chan
)
685 struct dmatest_chan
*dtc
;
686 struct dma_device
*dma_dev
= chan
->device
;
687 unsigned int thread_count
= 0;
690 dtc
= kmalloc(sizeof(struct dmatest_chan
), GFP_KERNEL
);
692 pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan
));
697 INIT_LIST_HEAD(&dtc
->threads
);
699 if (dma_has_cap(DMA_MEMCPY
, dma_dev
->cap_mask
)) {
700 cnt
= dmatest_add_threads(info
, dtc
, DMA_MEMCPY
);
701 thread_count
+= cnt
> 0 ? cnt
: 0;
703 if (dma_has_cap(DMA_XOR
, dma_dev
->cap_mask
)) {
704 cnt
= dmatest_add_threads(info
, dtc
, DMA_XOR
);
705 thread_count
+= cnt
> 0 ? cnt
: 0;
707 if (dma_has_cap(DMA_PQ
, dma_dev
->cap_mask
)) {
708 cnt
= dmatest_add_threads(info
, dtc
, DMA_PQ
);
709 thread_count
+= cnt
> 0 ? cnt
: 0;
712 pr_info("dmatest: Started %u threads using %s\n",
713 thread_count
, dma_chan_name(chan
));
715 list_add_tail(&dtc
->node
, &info
->channels
);
721 static bool filter(struct dma_chan
*chan
, void *param
)
723 struct dmatest_params
*params
= param
;
725 if (!dmatest_match_channel(params
, chan
) ||
726 !dmatest_match_device(params
, chan
->device
))
732 static int __run_threaded_test(struct dmatest_info
*info
)
735 struct dma_chan
*chan
;
736 struct dmatest_params
*params
= &info
->params
;
740 dma_cap_set(DMA_MEMCPY
, mask
);
742 chan
= dma_request_channel(mask
, filter
, params
);
744 err
= dmatest_add_channel(info
, chan
);
746 dma_release_channel(chan
);
747 break; /* add_channel failed, punt */
750 break; /* no more channels available */
751 if (params
->max_channels
&&
752 info
->nr_channels
>= params
->max_channels
)
753 break; /* we have all we need */
759 static int run_threaded_test(struct dmatest_info
*info
)
763 mutex_lock(&info
->lock
);
764 ret
= __run_threaded_test(info
);
765 mutex_unlock(&info
->lock
);
770 static void __stop_threaded_test(struct dmatest_info
*info
)
772 struct dmatest_chan
*dtc
, *_dtc
;
773 struct dma_chan
*chan
;
775 list_for_each_entry_safe(dtc
, _dtc
, &info
->channels
, node
) {
776 list_del(&dtc
->node
);
778 dmatest_cleanup_channel(dtc
);
779 pr_debug("dmatest: dropped channel %s\n", dma_chan_name(chan
));
780 dma_release_channel(chan
);
783 info
->nr_channels
= 0;
786 static void stop_threaded_test(struct dmatest_info
*info
)
788 mutex_lock(&info
->lock
);
789 __stop_threaded_test(info
);
790 mutex_unlock(&info
->lock
);
793 static int __restart_threaded_test(struct dmatest_info
*info
, bool run
)
795 struct dmatest_params
*params
= &info
->params
;
798 /* Stop any running test first */
799 __stop_threaded_test(info
);
804 /* Copy test parameters */
805 memcpy(params
, &info
->dbgfs_params
, sizeof(*params
));
807 /* Run test with new parameters */
808 ret
= __run_threaded_test(info
);
810 __stop_threaded_test(info
);
811 pr_err("dmatest: Can't run test\n");
817 static ssize_t
dtf_write_string(void *to
, size_t available
, loff_t
*ppos
,
818 const void __user
*from
, size_t count
)
823 len
= simple_write_to_buffer(tmp
, sizeof(tmp
) - 1, ppos
, from
, count
);
826 strlcpy(to
, strim(tmp
), available
);
832 static ssize_t
dtf_read_channel(struct file
*file
, char __user
*buf
,
833 size_t count
, loff_t
*ppos
)
835 struct dmatest_info
*info
= file
->private_data
;
836 return simple_read_from_buffer(buf
, count
, ppos
,
837 info
->dbgfs_params
.channel
,
838 strlen(info
->dbgfs_params
.channel
));
841 static ssize_t
dtf_write_channel(struct file
*file
, const char __user
*buf
,
842 size_t size
, loff_t
*ppos
)
844 struct dmatest_info
*info
= file
->private_data
;
845 return dtf_write_string(info
->dbgfs_params
.channel
,
846 sizeof(info
->dbgfs_params
.channel
),
850 static const struct file_operations dtf_channel_fops
= {
851 .read
= dtf_read_channel
,
852 .write
= dtf_write_channel
,
854 .llseek
= default_llseek
,
857 static ssize_t
dtf_read_device(struct file
*file
, char __user
*buf
,
858 size_t count
, loff_t
*ppos
)
860 struct dmatest_info
*info
= file
->private_data
;
861 return simple_read_from_buffer(buf
, count
, ppos
,
862 info
->dbgfs_params
.device
,
863 strlen(info
->dbgfs_params
.device
));
866 static ssize_t
dtf_write_device(struct file
*file
, const char __user
*buf
,
867 size_t size
, loff_t
*ppos
)
869 struct dmatest_info
*info
= file
->private_data
;
870 return dtf_write_string(info
->dbgfs_params
.device
,
871 sizeof(info
->dbgfs_params
.device
),
875 static const struct file_operations dtf_device_fops
= {
876 .read
= dtf_read_device
,
877 .write
= dtf_write_device
,
879 .llseek
= default_llseek
,
882 static ssize_t
dtf_read_run(struct file
*file
, char __user
*user_buf
,
883 size_t count
, loff_t
*ppos
)
885 struct dmatest_info
*info
= file
->private_data
;
888 mutex_lock(&info
->lock
);
889 if (info
->nr_channels
)
893 mutex_unlock(&info
->lock
);
896 return simple_read_from_buffer(user_buf
, count
, ppos
, buf
, 2);
899 static ssize_t
dtf_write_run(struct file
*file
, const char __user
*user_buf
,
900 size_t count
, loff_t
*ppos
)
902 struct dmatest_info
*info
= file
->private_data
;
907 if (copy_from_user(buf
, user_buf
, min(count
, (sizeof(buf
) - 1))))
910 if (strtobool(buf
, &bv
) == 0) {
911 mutex_lock(&info
->lock
);
912 ret
= __restart_threaded_test(info
, bv
);
913 mutex_unlock(&info
->lock
);
916 return ret
? ret
: count
;
919 static const struct file_operations dtf_run_fops
= {
920 .read
= dtf_read_run
,
921 .write
= dtf_write_run
,
923 .llseek
= default_llseek
,
926 static int dmatest_register_dbgfs(struct dmatest_info
*info
)
929 struct dmatest_params
*params
= &info
->dbgfs_params
;
932 d
= debugfs_create_dir("dmatest", NULL
);
940 /* Copy initial values */
941 memcpy(params
, &info
->params
, sizeof(*params
));
943 /* Test parameters */
945 d
= debugfs_create_u32("test_buf_size", S_IWUSR
| S_IRUGO
, info
->root
,
946 (u32
*)¶ms
->buf_size
);
947 if (IS_ERR_OR_NULL(d
))
950 d
= debugfs_create_file("channel", S_IRUGO
| S_IWUSR
, info
->root
,
951 info
, &dtf_channel_fops
);
952 if (IS_ERR_OR_NULL(d
))
955 d
= debugfs_create_file("device", S_IRUGO
| S_IWUSR
, info
->root
,
956 info
, &dtf_device_fops
);
957 if (IS_ERR_OR_NULL(d
))
960 d
= debugfs_create_u32("threads_per_chan", S_IWUSR
| S_IRUGO
, info
->root
,
961 (u32
*)¶ms
->threads_per_chan
);
962 if (IS_ERR_OR_NULL(d
))
965 d
= debugfs_create_u32("max_channels", S_IWUSR
| S_IRUGO
, info
->root
,
966 (u32
*)¶ms
->max_channels
);
967 if (IS_ERR_OR_NULL(d
))
970 d
= debugfs_create_u32("iterations", S_IWUSR
| S_IRUGO
, info
->root
,
971 (u32
*)¶ms
->iterations
);
972 if (IS_ERR_OR_NULL(d
))
975 d
= debugfs_create_u32("xor_sources", S_IWUSR
| S_IRUGO
, info
->root
,
976 (u32
*)¶ms
->xor_sources
);
977 if (IS_ERR_OR_NULL(d
))
980 d
= debugfs_create_u32("pq_sources", S_IWUSR
| S_IRUGO
, info
->root
,
981 (u32
*)¶ms
->pq_sources
);
982 if (IS_ERR_OR_NULL(d
))
985 d
= debugfs_create_u32("timeout", S_IWUSR
| S_IRUGO
, info
->root
,
986 (u32
*)¶ms
->timeout
);
987 if (IS_ERR_OR_NULL(d
))
990 /* Run or stop threaded test */
991 d
= debugfs_create_file("run", S_IWUSR
| S_IRUGO
, info
->root
,
992 info
, &dtf_run_fops
);
993 if (IS_ERR_OR_NULL(d
))
999 debugfs_remove_recursive(info
->root
);
1001 pr_err("dmatest: Failed to initialize debugfs\n");
1005 static int __init
dmatest_init(void)
1007 struct dmatest_info
*info
= &test_info
;
1008 struct dmatest_params
*params
= &info
->params
;
1011 memset(info
, 0, sizeof(*info
));
1013 mutex_init(&info
->lock
);
1014 INIT_LIST_HEAD(&info
->channels
);
1016 /* Set default parameters */
1017 params
->buf_size
= test_buf_size
;
1018 strlcpy(params
->channel
, test_channel
, sizeof(params
->channel
));
1019 strlcpy(params
->device
, test_device
, sizeof(params
->device
));
1020 params
->threads_per_chan
= threads_per_chan
;
1021 params
->max_channels
= max_channels
;
1022 params
->iterations
= iterations
;
1023 params
->xor_sources
= xor_sources
;
1024 params
->pq_sources
= pq_sources
;
1025 params
->timeout
= timeout
;
1027 ret
= dmatest_register_dbgfs(info
);
1034 return run_threaded_test(info
);
1037 /* when compiled-in wait for drivers to load first */
1038 late_initcall(dmatest_init
);
1040 static void __exit
dmatest_exit(void)
1042 struct dmatest_info
*info
= &test_info
;
1044 debugfs_remove_recursive(info
->root
);
1045 stop_threaded_test(info
);
1047 module_exit(dmatest_exit
);
1049 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
1050 MODULE_LICENSE("GPL v2");