Commit | Line | Data |
---|---|---|
50352fa7 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ba82664c AS |
2 | /* |
3 | * Intel(R) Trace Hub Memory Storage Unit | |
4 | * | |
5 | * Copyright (C) 2014-2015 Intel Corporation. | |
ba82664c AS |
6 | */ |
7 | ||
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/uaccess.h> | |
14 | #include <linux/sizes.h> | |
15 | #include <linux/printk.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/io.h> | |
20 | #include <linux/dma-mapping.h> | |
21 | ||
0c14dac9 LA |
22 | #ifdef CONFIG_X86 |
23 | #include <asm/set_memory.h> | |
24 | #endif | |
ba82664c AS |
25 | |
26 | #include "intel_th.h" | |
27 | #include "msu.h" | |
28 | ||
29 | #define msc_dev(x) (&(x)->thdev->dev) | |
30 | ||
ba82664c AS |
31 | /** |
32 | * struct msc_window - multiblock mode window descriptor | |
33 | * @entry: window list linkage (msc::win_list) | |
34 | * @pgoff: page offset into the buffer that this window starts at | |
35 | * @nr_blocks: number of blocks (pages) in this window | |
fa52b3fe | 36 | * @nr_segs: number of segments in this window (<= @nr_blocks) |
bbbc08a1 | 37 | * @_sgt: array of block descriptors |
ba39bd83 | 38 | * @sgt: array of block descriptors |
ba82664c AS |
39 | */ |
40 | struct msc_window { | |
41 | struct list_head entry; | |
42 | unsigned long pgoff; | |
43 | unsigned int nr_blocks; | |
fa52b3fe | 44 | unsigned int nr_segs; |
ba82664c | 45 | struct msc *msc; |
bbbc08a1 AS |
46 | struct sg_table _sgt; |
47 | struct sg_table *sgt; | |
ba82664c AS |
48 | }; |
49 | ||
50 | /** | |
51 | * struct msc_iter - iterator for msc buffer | |
52 | * @entry: msc::iter_list linkage | |
53 | * @msc: pointer to the MSC device | |
54 | * @start_win: oldest window | |
55 | * @win: current window | |
56 | * @offset: current logical offset into the buffer | |
57 | * @start_block: oldest block in the window | |
58 | * @block: block number in the window | |
59 | * @block_off: offset into current block | |
60 | * @wrap_count: block wrapping handling | |
61 | * @eof: end of buffer reached | |
62 | */ | |
63 | struct msc_iter { | |
64 | struct list_head entry; | |
65 | struct msc *msc; | |
66 | struct msc_window *start_win; | |
67 | struct msc_window *win; | |
68 | unsigned long offset; | |
69 | int start_block; | |
70 | int block; | |
71 | unsigned int block_off; | |
72 | unsigned int wrap_count; | |
73 | unsigned int eof; | |
74 | }; | |
75 | ||
76 | /** | |
77 | * struct msc - MSC device representation | |
78 | * @reg_base: register window base address | |
79 | * @thdev: intel_th_device pointer | |
80 | * @win_list: list of windows in multiblock mode | |
4e0eaf23 | 81 | * @single_sgt: single mode buffer |
aad14ad3 | 82 | * @cur_win: current window |
ba82664c AS |
83 | * @nr_pages: total number of pages allocated for this buffer |
84 | * @single_sz: amount of data in single mode | |
85 | * @single_wrap: single mode wrap occurred | |
86 | * @base: buffer's base pointer | |
87 | * @base_addr: buffer's base address | |
88 | * @user_count: number of users of the buffer | |
89 | * @mmap_count: number of mappings | |
90 | * @buf_mutex: mutex to serialize access to buffer-related bits | |
91 | ||
92 | * @enabled: MSC is enabled | |
93 | * @wrap: wrapping is enabled | |
94 | * @mode: MSC operating mode | |
95 | * @burst_len: write burst length | |
96 | * @index: number of this MSC in the MSU | |
97 | */ | |
98 | struct msc { | |
99 | void __iomem *reg_base; | |
aac8da65 | 100 | void __iomem *msu_base; |
ba82664c AS |
101 | struct intel_th_device *thdev; |
102 | ||
103 | struct list_head win_list; | |
4e0eaf23 | 104 | struct sg_table single_sgt; |
aad14ad3 | 105 | struct msc_window *cur_win; |
ba82664c AS |
106 | unsigned long nr_pages; |
107 | unsigned long single_sz; | |
108 | unsigned int single_wrap : 1; | |
109 | void *base; | |
110 | dma_addr_t base_addr; | |
111 | ||
112 | /* <0: no buffer, 0: no users, >0: active users */ | |
113 | atomic_t user_count; | |
114 | ||
115 | atomic_t mmap_count; | |
116 | struct mutex buf_mutex; | |
117 | ||
ba82664c AS |
118 | struct list_head iter_list; |
119 | ||
120 | /* config */ | |
121 | unsigned int enabled : 1, | |
aac8da65 AS |
122 | wrap : 1, |
123 | do_irq : 1; | |
ba82664c AS |
124 | unsigned int mode; |
125 | unsigned int burst_len; | |
126 | unsigned int index; | |
127 | }; | |
128 | ||
129 | static inline bool msc_block_is_empty(struct msc_block_desc *bdesc) | |
130 | { | |
131 | /* header hasn't been written */ | |
132 | if (!bdesc->valid_dw) | |
133 | return true; | |
134 | ||
135 | /* valid_dw includes the header */ | |
136 | if (!msc_data_sz(bdesc)) | |
137 | return true; | |
138 | ||
139 | return false; | |
140 | } | |
141 | ||
ba39bd83 AS |
142 | static inline struct msc_block_desc * |
143 | msc_win_block(struct msc_window *win, unsigned int block) | |
144 | { | |
bbbc08a1 | 145 | return sg_virt(&win->sgt->sgl[block]); |
ba39bd83 AS |
146 | } |
147 | ||
fa52b3fe AS |
148 | static inline size_t |
149 | msc_win_actual_bsz(struct msc_window *win, unsigned int block) | |
150 | { | |
bbbc08a1 | 151 | return win->sgt->sgl[block].length; |
fa52b3fe AS |
152 | } |
153 | ||
ba39bd83 AS |
154 | static inline dma_addr_t |
155 | msc_win_baddr(struct msc_window *win, unsigned int block) | |
156 | { | |
bbbc08a1 | 157 | return sg_dma_address(&win->sgt->sgl[block]); |
ba39bd83 AS |
158 | } |
159 | ||
160 | static inline unsigned long | |
161 | msc_win_bpfn(struct msc_window *win, unsigned int block) | |
162 | { | |
163 | return msc_win_baddr(win, block) >> PAGE_SHIFT; | |
164 | } | |
165 | ||
aad14ad3 AS |
166 | /** |
167 | * msc_is_last_win() - check if a window is the last one for a given MSC | |
168 | * @win: window | |
169 | * Return: true if @win is the last window in MSC's multiblock buffer | |
170 | */ | |
171 | static inline bool msc_is_last_win(struct msc_window *win) | |
172 | { | |
173 | return win->entry.next == &win->msc->win_list; | |
174 | } | |
175 | ||
176 | /** | |
177 | * msc_next_window() - return next window in the multiblock buffer | |
178 | * @win: current window | |
179 | * | |
180 | * Return: window following the current one | |
181 | */ | |
182 | static struct msc_window *msc_next_window(struct msc_window *win) | |
183 | { | |
184 | if (msc_is_last_win(win)) | |
185 | return list_first_entry(&win->msc->win_list, struct msc_window, | |
186 | entry); | |
187 | ||
188 | return list_next_entry(win, entry); | |
189 | } | |
190 | ||
ba82664c | 191 | /** |
f505e91e | 192 | * msc_find_window() - find a window matching a given sg_table |
ba82664c | 193 | * @msc: MSC device |
f505e91e AS |
194 | * @sgt: SG table of the window |
195 | * @nonempty: skip over empty windows | |
ba82664c | 196 | * |
f505e91e AS |
197 | * Return: MSC window structure pointer or NULL if the window |
198 | * could not be found. | |
ba82664c | 199 | */ |
f505e91e AS |
200 | static struct msc_window * |
201 | msc_find_window(struct msc *msc, struct sg_table *sgt, bool nonempty) | |
ba82664c | 202 | { |
f505e91e | 203 | struct msc_window *win; |
ba82664c AS |
204 | unsigned int found = 0; |
205 | ||
206 | if (list_empty(&msc->win_list)) | |
207 | return NULL; | |
208 | ||
209 | /* | |
210 | * we might need a radix tree for this, depending on how | |
211 | * many windows a typical user would allocate; ideally it's | |
212 | * something like 2, in which case we're good | |
213 | */ | |
214 | list_for_each_entry(win, &msc->win_list, entry) { | |
f505e91e | 215 | if (win->sgt == sgt) |
ba82664c AS |
216 | found++; |
217 | ||
218 | /* skip the empty ones */ | |
f505e91e | 219 | if (nonempty && msc_block_is_empty(msc_win_block(win, 0))) |
ba82664c AS |
220 | continue; |
221 | ||
222 | if (found) | |
223 | return win; | |
224 | } | |
225 | ||
f505e91e AS |
226 | return NULL; |
227 | } | |
228 | ||
229 | /** | |
230 | * msc_oldest_window() - locate the window with oldest data | |
231 | * @msc: MSC device | |
232 | * | |
233 | * This should only be used in multiblock mode. Caller should hold the | |
234 | * msc::user_count reference. | |
235 | * | |
236 | * Return: the oldest window with valid data | |
237 | */ | |
238 | static struct msc_window *msc_oldest_window(struct msc *msc) | |
239 | { | |
240 | struct msc_window *win; | |
241 | ||
242 | if (list_empty(&msc->win_list)) | |
243 | return NULL; | |
244 | ||
245 | win = msc_find_window(msc, msc_next_window(msc->cur_win)->sgt, true); | |
246 | if (win) | |
247 | return win; | |
248 | ||
0de9e035 | 249 | return list_first_entry(&msc->win_list, struct msc_window, entry); |
ba82664c AS |
250 | } |
251 | ||
252 | /** | |
253 | * msc_win_oldest_block() - locate the oldest block in a given window | |
254 | * @win: window to look at | |
255 | * | |
256 | * Return: index of the block with the oldest data | |
257 | */ | |
258 | static unsigned int msc_win_oldest_block(struct msc_window *win) | |
259 | { | |
260 | unsigned int blk; | |
ba39bd83 | 261 | struct msc_block_desc *bdesc = msc_win_block(win, 0); |
ba82664c AS |
262 | |
263 | /* without wrapping, first block is the oldest */ | |
264 | if (!msc_block_wrapped(bdesc)) | |
265 | return 0; | |
266 | ||
267 | /* | |
268 | * with wrapping, last written block contains both the newest and the | |
269 | * oldest data for this window. | |
270 | */ | |
fa52b3fe | 271 | for (blk = 0; blk < win->nr_segs; blk++) { |
ba39bd83 | 272 | bdesc = msc_win_block(win, blk); |
ba82664c AS |
273 | |
274 | if (msc_block_last_written(bdesc)) | |
275 | return blk; | |
276 | } | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
ba82664c AS |
281 | static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter) |
282 | { | |
ba39bd83 | 283 | return msc_win_block(iter->win, iter->block); |
ba82664c AS |
284 | } |
285 | ||
286 | static void msc_iter_init(struct msc_iter *iter) | |
287 | { | |
288 | memset(iter, 0, sizeof(*iter)); | |
289 | iter->start_block = -1; | |
290 | iter->block = -1; | |
291 | } | |
292 | ||
293 | static struct msc_iter *msc_iter_install(struct msc *msc) | |
294 | { | |
295 | struct msc_iter *iter; | |
296 | ||
297 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
298 | if (!iter) | |
a45ff6ed AS |
299 | return ERR_PTR(-ENOMEM); |
300 | ||
301 | mutex_lock(&msc->buf_mutex); | |
302 | ||
303 | /* | |
304 | * Reading and tracing are mutually exclusive; if msc is | |
305 | * enabled, open() will fail; otherwise existing readers | |
306 | * will prevent enabling the msc and the rest of fops don't | |
307 | * need to worry about it. | |
308 | */ | |
309 | if (msc->enabled) { | |
310 | kfree(iter); | |
311 | iter = ERR_PTR(-EBUSY); | |
312 | goto unlock; | |
313 | } | |
ba82664c AS |
314 | |
315 | msc_iter_init(iter); | |
316 | iter->msc = msc; | |
317 | ||
ba82664c | 318 | list_add_tail(&iter->entry, &msc->iter_list); |
a45ff6ed AS |
319 | unlock: |
320 | mutex_unlock(&msc->buf_mutex); | |
ba82664c AS |
321 | |
322 | return iter; | |
323 | } | |
324 | ||
325 | static void msc_iter_remove(struct msc_iter *iter, struct msc *msc) | |
326 | { | |
a45ff6ed | 327 | mutex_lock(&msc->buf_mutex); |
ba82664c | 328 | list_del(&iter->entry); |
a45ff6ed | 329 | mutex_unlock(&msc->buf_mutex); |
ba82664c AS |
330 | |
331 | kfree(iter); | |
332 | } | |
333 | ||
334 | static void msc_iter_block_start(struct msc_iter *iter) | |
335 | { | |
336 | if (iter->start_block != -1) | |
337 | return; | |
338 | ||
339 | iter->start_block = msc_win_oldest_block(iter->win); | |
340 | iter->block = iter->start_block; | |
341 | iter->wrap_count = 0; | |
342 | ||
343 | /* | |
344 | * start with the block with oldest data; if data has wrapped | |
345 | * in this window, it should be in this block | |
346 | */ | |
347 | if (msc_block_wrapped(msc_iter_bdesc(iter))) | |
348 | iter->wrap_count = 2; | |
349 | ||
350 | } | |
351 | ||
352 | static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc) | |
353 | { | |
354 | /* already started, nothing to do */ | |
355 | if (iter->start_win) | |
356 | return 0; | |
357 | ||
358 | iter->start_win = msc_oldest_window(msc); | |
359 | if (!iter->start_win) | |
360 | return -EINVAL; | |
361 | ||
362 | iter->win = iter->start_win; | |
363 | iter->start_block = -1; | |
364 | ||
365 | msc_iter_block_start(iter); | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static int msc_iter_win_advance(struct msc_iter *iter) | |
371 | { | |
372 | iter->win = msc_next_window(iter->win); | |
373 | iter->start_block = -1; | |
374 | ||
375 | if (iter->win == iter->start_win) { | |
376 | iter->eof++; | |
377 | return 1; | |
378 | } | |
379 | ||
380 | msc_iter_block_start(iter); | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | static int msc_iter_block_advance(struct msc_iter *iter) | |
386 | { | |
387 | iter->block_off = 0; | |
388 | ||
389 | /* wrapping */ | |
390 | if (iter->wrap_count && iter->block == iter->start_block) { | |
391 | iter->wrap_count--; | |
392 | if (!iter->wrap_count) | |
393 | /* copied newest data from the wrapped block */ | |
394 | return msc_iter_win_advance(iter); | |
395 | } | |
396 | ||
397 | /* no wrapping, check for last written block */ | |
398 | if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter))) | |
399 | /* copied newest data for the window */ | |
400 | return msc_iter_win_advance(iter); | |
401 | ||
402 | /* block advance */ | |
fa52b3fe | 403 | if (++iter->block == iter->win->nr_segs) |
ba82664c AS |
404 | iter->block = 0; |
405 | ||
406 | /* no wrapping, sanity check in case there is no last written block */ | |
407 | if (!iter->wrap_count && iter->block == iter->start_block) | |
408 | return msc_iter_win_advance(iter); | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | /** | |
414 | * msc_buffer_iterate() - go through multiblock buffer's data | |
415 | * @iter: iterator structure | |
416 | * @size: amount of data to scan | |
417 | * @data: callback's private data | |
418 | * @fn: iterator callback | |
419 | * | |
420 | * This will start at the window which will be written to next (containing | |
421 | * the oldest data) and work its way to the current window, calling @fn | |
422 | * for each chunk of data as it goes. | |
423 | * | |
424 | * Caller should have msc::user_count reference to make sure the buffer | |
425 | * doesn't disappear from under us. | |
426 | * | |
427 | * Return: amount of data actually scanned. | |
428 | */ | |
429 | static ssize_t | |
430 | msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data, | |
431 | unsigned long (*fn)(void *, void *, size_t)) | |
432 | { | |
433 | struct msc *msc = iter->msc; | |
434 | size_t len = size; | |
435 | unsigned int advance; | |
436 | ||
437 | if (iter->eof) | |
438 | return 0; | |
439 | ||
440 | /* start with the oldest window */ | |
441 | if (msc_iter_win_start(iter, msc)) | |
442 | return 0; | |
443 | ||
444 | do { | |
445 | unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter)); | |
446 | void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC; | |
447 | size_t tocopy = data_bytes, copied = 0; | |
448 | size_t remaining = 0; | |
449 | ||
450 | advance = 1; | |
451 | ||
452 | /* | |
453 | * If block wrapping happened, we need to visit the last block | |
454 | * twice, because it contains both the oldest and the newest | |
455 | * data in this window. | |
456 | * | |
457 | * First time (wrap_count==2), in the very beginning, to collect | |
458 | * the oldest data, which is in the range | |
459 | * (data_bytes..DATA_IN_PAGE). | |
460 | * | |
461 | * Second time (wrap_count==1), it's just like any other block, | |
462 | * containing data in the range of [MSC_BDESC..data_bytes]. | |
463 | */ | |
e4eca2a1 | 464 | if (iter->block == iter->start_block && iter->wrap_count == 2) { |
ba82664c AS |
465 | tocopy = DATA_IN_PAGE - data_bytes; |
466 | src += data_bytes; | |
467 | } | |
468 | ||
469 | if (!tocopy) | |
470 | goto next_block; | |
471 | ||
472 | tocopy -= iter->block_off; | |
473 | src += iter->block_off; | |
474 | ||
475 | if (len < tocopy) { | |
476 | tocopy = len; | |
477 | advance = 0; | |
478 | } | |
479 | ||
480 | remaining = fn(data, src, tocopy); | |
481 | ||
482 | if (remaining) | |
483 | advance = 0; | |
484 | ||
485 | copied = tocopy - remaining; | |
486 | len -= copied; | |
487 | iter->block_off += copied; | |
488 | iter->offset += copied; | |
489 | ||
490 | if (!advance) | |
491 | break; | |
492 | ||
493 | next_block: | |
494 | if (msc_iter_block_advance(iter)) | |
495 | break; | |
496 | ||
497 | } while (len); | |
498 | ||
499 | return size - len; | |
500 | } | |
501 | ||
502 | /** | |
503 | * msc_buffer_clear_hw_header() - clear hw header for multiblock | |
504 | * @msc: MSC device | |
505 | */ | |
506 | static void msc_buffer_clear_hw_header(struct msc *msc) | |
507 | { | |
508 | struct msc_window *win; | |
509 | ||
ba82664c AS |
510 | list_for_each_entry(win, &msc->win_list, entry) { |
511 | unsigned int blk; | |
512 | size_t hw_sz = sizeof(struct msc_block_desc) - | |
513 | offsetof(struct msc_block_desc, hw_tag); | |
514 | ||
fa52b3fe | 515 | for (blk = 0; blk < win->nr_segs; blk++) { |
ba39bd83 | 516 | struct msc_block_desc *bdesc = msc_win_block(win, blk); |
ba82664c AS |
517 | |
518 | memset(&bdesc->hw_tag, 0, hw_sz); | |
519 | } | |
520 | } | |
ba82664c AS |
521 | } |
522 | ||
aac8da65 AS |
523 | static int intel_th_msu_init(struct msc *msc) |
524 | { | |
525 | u32 mintctl, msusts; | |
526 | ||
527 | if (!msc->do_irq) | |
528 | return 0; | |
529 | ||
530 | mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); | |
531 | mintctl |= msc->index ? M1BLIE : M0BLIE; | |
532 | iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); | |
533 | if (mintctl != ioread32(msc->msu_base + REG_MSU_MINTCTL)) { | |
534 | dev_info(msc_dev(msc), "MINTCTL ignores writes: no usable interrupts\n"); | |
535 | msc->do_irq = 0; | |
536 | return 0; | |
537 | } | |
538 | ||
539 | msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); | |
540 | iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static void intel_th_msu_deinit(struct msc *msc) | |
546 | { | |
547 | u32 mintctl; | |
548 | ||
549 | if (!msc->do_irq) | |
550 | return; | |
551 | ||
552 | mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); | |
553 | mintctl &= msc->index ? ~M1BLIE : ~M0BLIE; | |
554 | iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); | |
555 | } | |
556 | ||
ba82664c AS |
557 | /** |
558 | * msc_configure() - set up MSC hardware | |
559 | * @msc: the MSC device to configure | |
560 | * | |
561 | * Program storage mode, wrapping, burst length and trace buffer address | |
a45ff6ed AS |
562 | * into a given MSC. Then, enable tracing and set msc::enabled. |
563 | * The latter is serialized on msc::buf_mutex, so make sure to hold it. | |
ba82664c AS |
564 | */ |
565 | static int msc_configure(struct msc *msc) | |
566 | { | |
567 | u32 reg; | |
568 | ||
a45ff6ed AS |
569 | lockdep_assert_held(&msc->buf_mutex); |
570 | ||
ba82664c AS |
571 | if (msc->mode > MSC_MODE_MULTI) |
572 | return -ENOTSUPP; | |
573 | ||
574 | if (msc->mode == MSC_MODE_MULTI) | |
575 | msc_buffer_clear_hw_header(msc); | |
576 | ||
577 | reg = msc->base_addr >> PAGE_SHIFT; | |
578 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR); | |
579 | ||
580 | if (msc->mode == MSC_MODE_SINGLE) { | |
581 | reg = msc->nr_pages; | |
582 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0SIZE); | |
583 | } | |
584 | ||
585 | reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); | |
586 | reg &= ~(MSC_MODE | MSC_WRAPEN | MSC_EN | MSC_RD_HDR_OVRD); | |
587 | ||
a45ff6ed | 588 | reg |= MSC_EN; |
ba82664c AS |
589 | reg |= msc->mode << __ffs(MSC_MODE); |
590 | reg |= msc->burst_len << __ffs(MSC_LEN); | |
a45ff6ed | 591 | |
ba82664c AS |
592 | if (msc->wrap) |
593 | reg |= MSC_WRAPEN; | |
ba82664c AS |
594 | |
595 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); | |
596 | ||
a45ff6ed AS |
597 | msc->thdev->output.multiblock = msc->mode == MSC_MODE_MULTI; |
598 | intel_th_trace_enable(msc->thdev); | |
599 | msc->enabled = 1; | |
600 | ||
ba82664c AS |
601 | |
602 | return 0; | |
603 | } | |
604 | ||
605 | /** | |
606 | * msc_disable() - disable MSC hardware | |
607 | * @msc: MSC device to disable | |
608 | * | |
609 | * If @msc is enabled, disable tracing on the switch and then disable MSC | |
a45ff6ed | 610 | * storage. Caller must hold msc::buf_mutex. |
ba82664c AS |
611 | */ |
612 | static void msc_disable(struct msc *msc) | |
613 | { | |
ba82664c AS |
614 | u32 reg; |
615 | ||
a45ff6ed | 616 | lockdep_assert_held(&msc->buf_mutex); |
ba82664c AS |
617 | |
618 | intel_th_trace_disable(msc->thdev); | |
619 | ||
ba82664c | 620 | if (msc->mode == MSC_MODE_SINGLE) { |
8d415512 | 621 | reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); |
ba82664c AS |
622 | msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT); |
623 | ||
624 | reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP); | |
625 | msc->single_sz = reg & ((msc->nr_pages << PAGE_SHIFT) - 1); | |
626 | dev_dbg(msc_dev(msc), "MSCnMWP: %08x/%08lx, wrap: %d\n", | |
627 | reg, msc->single_sz, msc->single_wrap); | |
628 | } | |
629 | ||
630 | reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); | |
631 | reg &= ~MSC_EN; | |
632 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); | |
633 | msc->enabled = 0; | |
634 | ||
635 | iowrite32(0, msc->reg_base + REG_MSU_MSC0BAR); | |
636 | iowrite32(0, msc->reg_base + REG_MSU_MSC0SIZE); | |
637 | ||
638 | dev_dbg(msc_dev(msc), "MSCnNWSA: %08x\n", | |
639 | ioread32(msc->reg_base + REG_MSU_MSC0NWSA)); | |
640 | ||
641 | reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); | |
642 | dev_dbg(msc_dev(msc), "MSCnSTS: %08x\n", reg); | |
643 | } | |
644 | ||
645 | static int intel_th_msc_activate(struct intel_th_device *thdev) | |
646 | { | |
647 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
a45ff6ed | 648 | int ret = -EBUSY; |
ba82664c AS |
649 | |
650 | if (!atomic_inc_unless_negative(&msc->user_count)) | |
651 | return -ENODEV; | |
652 | ||
a45ff6ed | 653 | mutex_lock(&msc->buf_mutex); |
ba82664c | 654 | |
a45ff6ed AS |
655 | /* if there are readers, refuse */ |
656 | if (list_empty(&msc->iter_list)) | |
657 | ret = msc_configure(msc); | |
ba82664c | 658 | |
a45ff6ed AS |
659 | mutex_unlock(&msc->buf_mutex); |
660 | ||
661 | if (ret) | |
662 | atomic_dec(&msc->user_count); | |
ba82664c | 663 | |
a45ff6ed | 664 | return ret; |
ba82664c AS |
665 | } |
666 | ||
667 | static void intel_th_msc_deactivate(struct intel_th_device *thdev) | |
668 | { | |
669 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
670 | ||
a45ff6ed AS |
671 | mutex_lock(&msc->buf_mutex); |
672 | if (msc->enabled) { | |
673 | msc_disable(msc); | |
674 | atomic_dec(&msc->user_count); | |
675 | } | |
676 | mutex_unlock(&msc->buf_mutex); | |
ba82664c AS |
677 | } |
678 | ||
679 | /** | |
680 | * msc_buffer_contig_alloc() - allocate a contiguous buffer for SINGLE mode | |
681 | * @msc: MSC device | |
682 | * @size: allocation size in bytes | |
683 | * | |
684 | * This modifies msc::base, which requires msc::buf_mutex to serialize, so the | |
685 | * caller is expected to hold it. | |
686 | * | |
687 | * Return: 0 on success, -errno otherwise. | |
688 | */ | |
689 | static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) | |
690 | { | |
4e0eaf23 | 691 | unsigned long nr_pages = size >> PAGE_SHIFT; |
ba82664c AS |
692 | unsigned int order = get_order(size); |
693 | struct page *page; | |
4e0eaf23 | 694 | int ret; |
ba82664c AS |
695 | |
696 | if (!size) | |
697 | return 0; | |
698 | ||
4e0eaf23 AS |
699 | ret = sg_alloc_table(&msc->single_sgt, 1, GFP_KERNEL); |
700 | if (ret) | |
701 | goto err_out; | |
702 | ||
703 | ret = -ENOMEM; | |
918b8646 | 704 | page = alloc_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32, order); |
ba82664c | 705 | if (!page) |
4e0eaf23 | 706 | goto err_free_sgt; |
ba82664c AS |
707 | |
708 | split_page(page, order); | |
4e0eaf23 AS |
709 | sg_set_buf(msc->single_sgt.sgl, page_address(page), size); |
710 | ||
711 | ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1, | |
712 | DMA_FROM_DEVICE); | |
713 | if (ret < 0) | |
714 | goto err_free_pages; | |
715 | ||
716 | msc->nr_pages = nr_pages; | |
ba82664c | 717 | msc->base = page_address(page); |
4e0eaf23 | 718 | msc->base_addr = sg_dma_address(msc->single_sgt.sgl); |
ba82664c AS |
719 | |
720 | return 0; | |
4e0eaf23 AS |
721 | |
722 | err_free_pages: | |
723 | __free_pages(page, order); | |
724 | ||
725 | err_free_sgt: | |
726 | sg_free_table(&msc->single_sgt); | |
727 | ||
728 | err_out: | |
729 | return ret; | |
ba82664c AS |
730 | } |
731 | ||
732 | /** | |
733 | * msc_buffer_contig_free() - free a contiguous buffer | |
734 | * @msc: MSC configured in SINGLE mode | |
735 | */ | |
736 | static void msc_buffer_contig_free(struct msc *msc) | |
737 | { | |
738 | unsigned long off; | |
739 | ||
4e0eaf23 AS |
740 | dma_unmap_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, |
741 | 1, DMA_FROM_DEVICE); | |
742 | sg_free_table(&msc->single_sgt); | |
743 | ||
ba82664c AS |
744 | for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { |
745 | struct page *page = virt_to_page(msc->base + off); | |
746 | ||
747 | page->mapping = NULL; | |
748 | __free_page(page); | |
749 | } | |
750 | ||
751 | msc->nr_pages = 0; | |
752 | } | |
753 | ||
754 | /** | |
755 | * msc_buffer_contig_get_page() - find a page at a given offset | |
756 | * @msc: MSC configured in SINGLE mode | |
757 | * @pgoff: page offset | |
758 | * | |
759 | * Return: page, if @pgoff is within the range, NULL otherwise. | |
760 | */ | |
761 | static struct page *msc_buffer_contig_get_page(struct msc *msc, | |
762 | unsigned long pgoff) | |
763 | { | |
764 | if (pgoff >= msc->nr_pages) | |
765 | return NULL; | |
766 | ||
767 | return virt_to_page(msc->base + (pgoff << PAGE_SHIFT)); | |
768 | } | |
769 | ||
ba39bd83 | 770 | static int __msc_buffer_win_alloc(struct msc_window *win, |
fa52b3fe | 771 | unsigned int nr_segs) |
ba39bd83 AS |
772 | { |
773 | struct scatterlist *sg_ptr; | |
774 | void *block; | |
775 | int i, ret; | |
776 | ||
bbbc08a1 | 777 | ret = sg_alloc_table(win->sgt, nr_segs, GFP_KERNEL); |
ba39bd83 AS |
778 | if (ret) |
779 | return -ENOMEM; | |
780 | ||
bbbc08a1 | 781 | for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { |
ba39bd83 AS |
782 | block = dma_alloc_coherent(msc_dev(win->msc)->parent->parent, |
783 | PAGE_SIZE, &sg_dma_address(sg_ptr), | |
784 | GFP_KERNEL); | |
785 | if (!block) | |
786 | goto err_nomem; | |
787 | ||
788 | sg_set_buf(sg_ptr, block, PAGE_SIZE); | |
789 | } | |
790 | ||
fa52b3fe | 791 | return nr_segs; |
ba39bd83 AS |
792 | |
793 | err_nomem: | |
794 | for (i--; i >= 0; i--) | |
795 | dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, | |
796 | msc_win_block(win, i), | |
797 | msc_win_baddr(win, i)); | |
798 | ||
bbbc08a1 | 799 | sg_free_table(win->sgt); |
ba39bd83 AS |
800 | |
801 | return -ENOMEM; | |
802 | } | |
803 | ||
b96fb368 | 804 | #ifdef CONFIG_X86 |
fa52b3fe | 805 | static void msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) |
b96fb368 SZ |
806 | { |
807 | int i; | |
808 | ||
fa52b3fe | 809 | for (i = 0; i < nr_segs; i++) |
b96fb368 SZ |
810 | /* Set the page as uncached */ |
811 | set_memory_uc((unsigned long)msc_win_block(win, i), 1); | |
812 | } | |
813 | ||
814 | static void msc_buffer_set_wb(struct msc_window *win) | |
815 | { | |
816 | int i; | |
817 | ||
fa52b3fe | 818 | for (i = 0; i < win->nr_segs; i++) |
b96fb368 SZ |
819 | /* Reset the page to write-back */ |
820 | set_memory_wb((unsigned long)msc_win_block(win, i), 1); | |
821 | } | |
822 | #else /* !X86 */ | |
823 | static inline void | |
fa52b3fe | 824 | msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) {} |
b96fb368 SZ |
825 | static inline void msc_buffer_set_wb(struct msc_window *win) {} |
826 | #endif /* CONFIG_X86 */ | |
827 | ||
ba82664c AS |
828 | /** |
829 | * msc_buffer_win_alloc() - alloc a window for a multiblock mode | |
830 | * @msc: MSC device | |
831 | * @nr_blocks: number of pages in this window | |
832 | * | |
833 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex | |
834 | * to serialize, so the caller is expected to hold it. | |
835 | * | |
836 | * Return: 0 on success, -errno otherwise. | |
837 | */ | |
838 | static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks) | |
839 | { | |
840 | struct msc_window *win; | |
b96fb368 | 841 | int ret = -ENOMEM; |
ba82664c AS |
842 | |
843 | if (!nr_blocks) | |
844 | return 0; | |
845 | ||
ba39bd83 AS |
846 | /* |
847 | * This limitation hold as long as we need random access to the | |
848 | * block. When that changes, this can go away. | |
849 | */ | |
850 | if (nr_blocks > SG_MAX_SINGLE_ALLOC) | |
851 | return -EINVAL; | |
852 | ||
853 | win = kzalloc(sizeof(*win), GFP_KERNEL); | |
ba82664c AS |
854 | if (!win) |
855 | return -ENOMEM; | |
856 | ||
ba39bd83 | 857 | win->msc = msc; |
bbbc08a1 | 858 | win->sgt = &win->_sgt; |
ba39bd83 | 859 | |
ba82664c | 860 | if (!list_empty(&msc->win_list)) { |
0de9e035 AS |
861 | struct msc_window *prev = list_last_entry(&msc->win_list, |
862 | struct msc_window, | |
863 | entry); | |
ba82664c AS |
864 | |
865 | win->pgoff = prev->pgoff + prev->nr_blocks; | |
866 | } | |
867 | ||
ba39bd83 AS |
868 | ret = __msc_buffer_win_alloc(win, nr_blocks); |
869 | if (ret < 0) | |
870 | goto err_nomem; | |
ba82664c | 871 | |
b96fb368 | 872 | msc_buffer_set_uc(win, ret); |
ba82664c | 873 | |
fa52b3fe AS |
874 | win->nr_segs = ret; |
875 | win->nr_blocks = nr_blocks; | |
ba82664c AS |
876 | |
877 | if (list_empty(&msc->win_list)) { | |
ba39bd83 AS |
878 | msc->base = msc_win_block(win, 0); |
879 | msc->base_addr = msc_win_baddr(win, 0); | |
aad14ad3 | 880 | msc->cur_win = win; |
ba82664c AS |
881 | } |
882 | ||
883 | list_add_tail(&win->entry, &msc->win_list); | |
884 | msc->nr_pages += nr_blocks; | |
885 | ||
886 | return 0; | |
887 | ||
888 | err_nomem: | |
ba82664c AS |
889 | kfree(win); |
890 | ||
891 | return ret; | |
892 | } | |
893 | ||
ba39bd83 AS |
894 | static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win) |
895 | { | |
896 | int i; | |
897 | ||
fa52b3fe | 898 | for (i = 0; i < win->nr_segs; i++) { |
bbbc08a1 | 899 | struct page *page = sg_page(&win->sgt->sgl[i]); |
ba39bd83 AS |
900 | |
901 | page->mapping = NULL; | |
902 | dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, | |
903 | msc_win_block(win, i), msc_win_baddr(win, i)); | |
904 | } | |
bbbc08a1 | 905 | sg_free_table(win->sgt); |
ba39bd83 AS |
906 | } |
907 | ||
ba82664c AS |
908 | /** |
909 | * msc_buffer_win_free() - free a window from MSC's window list | |
910 | * @msc: MSC device | |
911 | * @win: window to free | |
912 | * | |
913 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex | |
914 | * to serialize, so the caller is expected to hold it. | |
915 | */ | |
916 | static void msc_buffer_win_free(struct msc *msc, struct msc_window *win) | |
917 | { | |
ba82664c AS |
918 | msc->nr_pages -= win->nr_blocks; |
919 | ||
920 | list_del(&win->entry); | |
921 | if (list_empty(&msc->win_list)) { | |
922 | msc->base = NULL; | |
923 | msc->base_addr = 0; | |
924 | } | |
925 | ||
b96fb368 | 926 | msc_buffer_set_wb(win); |
ba39bd83 AS |
927 | |
928 | __msc_buffer_win_free(msc, win); | |
ba82664c AS |
929 | |
930 | kfree(win); | |
931 | } | |
932 | ||
933 | /** | |
934 | * msc_buffer_relink() - set up block descriptors for multiblock mode | |
935 | * @msc: MSC device | |
936 | * | |
937 | * This traverses msc::win_list, which requires msc::buf_mutex to serialize, | |
938 | * so the caller is expected to hold it. | |
939 | */ | |
940 | static void msc_buffer_relink(struct msc *msc) | |
941 | { | |
942 | struct msc_window *win, *next_win; | |
943 | ||
944 | /* call with msc::mutex locked */ | |
945 | list_for_each_entry(win, &msc->win_list, entry) { | |
946 | unsigned int blk; | |
947 | u32 sw_tag = 0; | |
948 | ||
949 | /* | |
950 | * Last window's next_win should point to the first window | |
951 | * and MSC_SW_TAG_LASTWIN should be set. | |
952 | */ | |
953 | if (msc_is_last_win(win)) { | |
954 | sw_tag |= MSC_SW_TAG_LASTWIN; | |
0de9e035 AS |
955 | next_win = list_first_entry(&msc->win_list, |
956 | struct msc_window, entry); | |
ba82664c | 957 | } else { |
0de9e035 | 958 | next_win = list_next_entry(win, entry); |
ba82664c AS |
959 | } |
960 | ||
fa52b3fe | 961 | for (blk = 0; blk < win->nr_segs; blk++) { |
ba39bd83 | 962 | struct msc_block_desc *bdesc = msc_win_block(win, blk); |
ba82664c AS |
963 | |
964 | memset(bdesc, 0, sizeof(*bdesc)); | |
965 | ||
ba39bd83 | 966 | bdesc->next_win = msc_win_bpfn(next_win, 0); |
ba82664c AS |
967 | |
968 | /* | |
969 | * Similarly to last window, last block should point | |
970 | * to the first one. | |
971 | */ | |
fa52b3fe | 972 | if (blk == win->nr_segs - 1) { |
ba82664c | 973 | sw_tag |= MSC_SW_TAG_LASTBLK; |
ba39bd83 | 974 | bdesc->next_blk = msc_win_bpfn(win, 0); |
ba82664c | 975 | } else { |
ba39bd83 | 976 | bdesc->next_blk = msc_win_bpfn(win, blk + 1); |
ba82664c AS |
977 | } |
978 | ||
979 | bdesc->sw_tag = sw_tag; | |
fa52b3fe | 980 | bdesc->block_sz = msc_win_actual_bsz(win, blk) / 64; |
ba82664c AS |
981 | } |
982 | } | |
983 | ||
984 | /* | |
985 | * Make the above writes globally visible before tracing is | |
986 | * enabled to make sure hardware sees them coherently. | |
987 | */ | |
988 | wmb(); | |
989 | } | |
990 | ||
991 | static void msc_buffer_multi_free(struct msc *msc) | |
992 | { | |
993 | struct msc_window *win, *iter; | |
994 | ||
995 | list_for_each_entry_safe(win, iter, &msc->win_list, entry) | |
996 | msc_buffer_win_free(msc, win); | |
997 | } | |
998 | ||
999 | static int msc_buffer_multi_alloc(struct msc *msc, unsigned long *nr_pages, | |
1000 | unsigned int nr_wins) | |
1001 | { | |
1002 | int ret, i; | |
1003 | ||
1004 | for (i = 0; i < nr_wins; i++) { | |
1005 | ret = msc_buffer_win_alloc(msc, nr_pages[i]); | |
1006 | if (ret) { | |
1007 | msc_buffer_multi_free(msc); | |
1008 | return ret; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | msc_buffer_relink(msc); | |
1013 | ||
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * msc_buffer_free() - free buffers for MSC | |
1019 | * @msc: MSC device | |
1020 | * | |
1021 | * Free MSC's storage buffers. | |
1022 | * | |
1023 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex to | |
1024 | * serialize, so the caller is expected to hold it. | |
1025 | */ | |
1026 | static void msc_buffer_free(struct msc *msc) | |
1027 | { | |
1028 | if (msc->mode == MSC_MODE_SINGLE) | |
1029 | msc_buffer_contig_free(msc); | |
1030 | else if (msc->mode == MSC_MODE_MULTI) | |
1031 | msc_buffer_multi_free(msc); | |
1032 | } | |
1033 | ||
1034 | /** | |
1035 | * msc_buffer_alloc() - allocate a buffer for MSC | |
1036 | * @msc: MSC device | |
1037 | * @size: allocation size in bytes | |
1038 | * | |
1039 | * Allocate a storage buffer for MSC, depending on the msc::mode, it will be | |
1040 | * either done via msc_buffer_contig_alloc() for SINGLE operation mode or | |
1041 | * msc_buffer_win_alloc() for multiblock operation. The latter allocates one | |
1042 | * window per invocation, so in multiblock mode this can be called multiple | |
1043 | * times for the same MSC to allocate multiple windows. | |
1044 | * | |
1045 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex | |
1046 | * to serialize, so the caller is expected to hold it. | |
1047 | * | |
1048 | * Return: 0 on success, -errno otherwise. | |
1049 | */ | |
1050 | static int msc_buffer_alloc(struct msc *msc, unsigned long *nr_pages, | |
1051 | unsigned int nr_wins) | |
1052 | { | |
1053 | int ret; | |
1054 | ||
1055 | /* -1: buffer not allocated */ | |
1056 | if (atomic_read(&msc->user_count) != -1) | |
1057 | return -EBUSY; | |
1058 | ||
1059 | if (msc->mode == MSC_MODE_SINGLE) { | |
1060 | if (nr_wins != 1) | |
1061 | return -EINVAL; | |
1062 | ||
1063 | ret = msc_buffer_contig_alloc(msc, nr_pages[0] << PAGE_SHIFT); | |
1064 | } else if (msc->mode == MSC_MODE_MULTI) { | |
1065 | ret = msc_buffer_multi_alloc(msc, nr_pages, nr_wins); | |
1066 | } else { | |
1067 | ret = -ENOTSUPP; | |
1068 | } | |
1069 | ||
1070 | if (!ret) { | |
1071 | /* allocation should be visible before the counter goes to 0 */ | |
1072 | smp_mb__before_atomic(); | |
1073 | ||
1074 | if (WARN_ON_ONCE(atomic_cmpxchg(&msc->user_count, -1, 0) != -1)) | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | ||
1078 | return ret; | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * msc_buffer_unlocked_free_unless_used() - free a buffer unless it's in use | |
1083 | * @msc: MSC device | |
1084 | * | |
1085 | * This will free MSC buffer unless it is in use or there is no allocated | |
1086 | * buffer. | |
1087 | * Caller needs to hold msc::buf_mutex. | |
1088 | * | |
1089 | * Return: 0 on successful deallocation or if there was no buffer to | |
1090 | * deallocate, -EBUSY if there are active users. | |
1091 | */ | |
1092 | static int msc_buffer_unlocked_free_unless_used(struct msc *msc) | |
1093 | { | |
1094 | int count, ret = 0; | |
1095 | ||
1096 | count = atomic_cmpxchg(&msc->user_count, 0, -1); | |
1097 | ||
1098 | /* > 0: buffer is allocated and has users */ | |
1099 | if (count > 0) | |
1100 | ret = -EBUSY; | |
1101 | /* 0: buffer is allocated, no users */ | |
1102 | else if (!count) | |
1103 | msc_buffer_free(msc); | |
1104 | /* < 0: no buffer, nothing to do */ | |
1105 | ||
1106 | return ret; | |
1107 | } | |
1108 | ||
1109 | /** | |
1110 | * msc_buffer_free_unless_used() - free a buffer unless it's in use | |
1111 | * @msc: MSC device | |
1112 | * | |
1113 | * This is a locked version of msc_buffer_unlocked_free_unless_used(). | |
1114 | */ | |
1115 | static int msc_buffer_free_unless_used(struct msc *msc) | |
1116 | { | |
1117 | int ret; | |
1118 | ||
1119 | mutex_lock(&msc->buf_mutex); | |
1120 | ret = msc_buffer_unlocked_free_unless_used(msc); | |
1121 | mutex_unlock(&msc->buf_mutex); | |
1122 | ||
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | /** | |
1127 | * msc_buffer_get_page() - get MSC buffer page at a given offset | |
1128 | * @msc: MSC device | |
1129 | * @pgoff: page offset into the storage buffer | |
1130 | * | |
1131 | * This traverses msc::win_list, so holding msc::buf_mutex is expected from | |
1132 | * the caller. | |
1133 | * | |
1134 | * Return: page if @pgoff corresponds to a valid buffer page or NULL. | |
1135 | */ | |
1136 | static struct page *msc_buffer_get_page(struct msc *msc, unsigned long pgoff) | |
1137 | { | |
1138 | struct msc_window *win; | |
fa52b3fe | 1139 | unsigned int blk; |
ba82664c AS |
1140 | |
1141 | if (msc->mode == MSC_MODE_SINGLE) | |
1142 | return msc_buffer_contig_get_page(msc, pgoff); | |
1143 | ||
1144 | list_for_each_entry(win, &msc->win_list, entry) | |
1145 | if (pgoff >= win->pgoff && pgoff < win->pgoff + win->nr_blocks) | |
1146 | goto found; | |
1147 | ||
1148 | return NULL; | |
1149 | ||
1150 | found: | |
1151 | pgoff -= win->pgoff; | |
fa52b3fe AS |
1152 | |
1153 | for (blk = 0; blk < win->nr_segs; blk++) { | |
bbbc08a1 | 1154 | struct page *page = sg_page(&win->sgt->sgl[blk]); |
fa52b3fe AS |
1155 | size_t pgsz = PFN_DOWN(msc_win_actual_bsz(win, blk)); |
1156 | ||
1157 | if (pgoff < pgsz) | |
1158 | return page + pgoff; | |
1159 | ||
1160 | pgoff -= pgsz; | |
1161 | } | |
1162 | ||
1163 | return NULL; | |
ba82664c AS |
1164 | } |
1165 | ||
1166 | /** | |
1167 | * struct msc_win_to_user_struct - data for copy_to_user() callback | |
1168 | * @buf: userspace buffer to copy data to | |
1169 | * @offset: running offset | |
1170 | */ | |
1171 | struct msc_win_to_user_struct { | |
1172 | char __user *buf; | |
1173 | unsigned long offset; | |
1174 | }; | |
1175 | ||
1176 | /** | |
1177 | * msc_win_to_user() - iterator for msc_buffer_iterate() to copy data to user | |
1178 | * @data: callback's private data | |
1179 | * @src: source buffer | |
1180 | * @len: amount of data to copy from the source buffer | |
1181 | */ | |
1182 | static unsigned long msc_win_to_user(void *data, void *src, size_t len) | |
1183 | { | |
1184 | struct msc_win_to_user_struct *u = data; | |
1185 | unsigned long ret; | |
1186 | ||
1187 | ret = copy_to_user(u->buf + u->offset, src, len); | |
1188 | u->offset += len - ret; | |
1189 | ||
1190 | return ret; | |
1191 | } | |
1192 | ||
1193 | ||
1194 | /* | |
1195 | * file operations' callbacks | |
1196 | */ | |
1197 | ||
1198 | static int intel_th_msc_open(struct inode *inode, struct file *file) | |
1199 | { | |
1200 | struct intel_th_device *thdev = file->private_data; | |
1201 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
1202 | struct msc_iter *iter; | |
1203 | ||
1204 | if (!capable(CAP_SYS_RAWIO)) | |
1205 | return -EPERM; | |
1206 | ||
1207 | iter = msc_iter_install(msc); | |
a45ff6ed AS |
1208 | if (IS_ERR(iter)) |
1209 | return PTR_ERR(iter); | |
ba82664c AS |
1210 | |
1211 | file->private_data = iter; | |
1212 | ||
1213 | return nonseekable_open(inode, file); | |
1214 | } | |
1215 | ||
1216 | static int intel_th_msc_release(struct inode *inode, struct file *file) | |
1217 | { | |
1218 | struct msc_iter *iter = file->private_data; | |
1219 | struct msc *msc = iter->msc; | |
1220 | ||
1221 | msc_iter_remove(iter, msc); | |
1222 | ||
1223 | return 0; | |
1224 | } | |
1225 | ||
1226 | static ssize_t | |
1227 | msc_single_to_user(struct msc *msc, char __user *buf, loff_t off, size_t len) | |
1228 | { | |
ed392688 | 1229 | unsigned long size = msc->nr_pages << PAGE_SHIFT, rem = len; |
ba82664c AS |
1230 | unsigned long start = off, tocopy = 0; |
1231 | ||
1232 | if (msc->single_wrap) { | |
1233 | start += msc->single_sz; | |
1234 | if (start < size) { | |
1235 | tocopy = min(rem, size - start); | |
1236 | if (copy_to_user(buf, msc->base + start, tocopy)) | |
1237 | return -EFAULT; | |
1238 | ||
1239 | buf += tocopy; | |
1240 | rem -= tocopy; | |
1241 | start += tocopy; | |
1242 | } | |
1243 | ||
1244 | start &= size - 1; | |
1245 | if (rem) { | |
1246 | tocopy = min(rem, msc->single_sz - start); | |
1247 | if (copy_to_user(buf, msc->base + start, tocopy)) | |
1248 | return -EFAULT; | |
1249 | ||
1250 | rem -= tocopy; | |
1251 | } | |
1252 | ||
1253 | return len - rem; | |
1254 | } | |
1255 | ||
1256 | if (copy_to_user(buf, msc->base + start, rem)) | |
1257 | return -EFAULT; | |
1258 | ||
1259 | return len; | |
1260 | } | |
1261 | ||
1262 | static ssize_t intel_th_msc_read(struct file *file, char __user *buf, | |
1263 | size_t len, loff_t *ppos) | |
1264 | { | |
1265 | struct msc_iter *iter = file->private_data; | |
1266 | struct msc *msc = iter->msc; | |
1267 | size_t size; | |
1268 | loff_t off = *ppos; | |
1269 | ssize_t ret = 0; | |
1270 | ||
1271 | if (!atomic_inc_unless_negative(&msc->user_count)) | |
1272 | return 0; | |
1273 | ||
ba82664c AS |
1274 | if (msc->mode == MSC_MODE_SINGLE && !msc->single_wrap) |
1275 | size = msc->single_sz; | |
1276 | else | |
1277 | size = msc->nr_pages << PAGE_SHIFT; | |
1278 | ||
1279 | if (!size) | |
2bed074a | 1280 | goto put_count; |
ba82664c | 1281 | |
2bed074a | 1282 | if (off >= size) |
ba82664c | 1283 | goto put_count; |
2bed074a | 1284 | |
ba82664c AS |
1285 | if (off + len >= size) |
1286 | len = size - off; | |
1287 | ||
1288 | if (msc->mode == MSC_MODE_SINGLE) { | |
1289 | ret = msc_single_to_user(msc, buf, off, len); | |
1290 | if (ret >= 0) | |
1291 | *ppos += ret; | |
1292 | } else if (msc->mode == MSC_MODE_MULTI) { | |
1293 | struct msc_win_to_user_struct u = { | |
1294 | .buf = buf, | |
1295 | .offset = 0, | |
1296 | }; | |
1297 | ||
1298 | ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user); | |
1299 | if (ret >= 0) | |
1300 | *ppos = iter->offset; | |
1301 | } else { | |
1302 | ret = -ENOTSUPP; | |
1303 | } | |
1304 | ||
1305 | put_count: | |
1306 | atomic_dec(&msc->user_count); | |
1307 | ||
1308 | return ret; | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * vm operations callbacks (vm_ops) | |
1313 | */ | |
1314 | ||
1315 | static void msc_mmap_open(struct vm_area_struct *vma) | |
1316 | { | |
1317 | struct msc_iter *iter = vma->vm_file->private_data; | |
1318 | struct msc *msc = iter->msc; | |
1319 | ||
1320 | atomic_inc(&msc->mmap_count); | |
1321 | } | |
1322 | ||
1323 | static void msc_mmap_close(struct vm_area_struct *vma) | |
1324 | { | |
1325 | struct msc_iter *iter = vma->vm_file->private_data; | |
1326 | struct msc *msc = iter->msc; | |
1327 | unsigned long pg; | |
1328 | ||
1329 | if (!atomic_dec_and_mutex_lock(&msc->mmap_count, &msc->buf_mutex)) | |
1330 | return; | |
1331 | ||
0139aa7b | 1332 | /* drop page _refcounts */ |
ba82664c AS |
1333 | for (pg = 0; pg < msc->nr_pages; pg++) { |
1334 | struct page *page = msc_buffer_get_page(msc, pg); | |
1335 | ||
1336 | if (WARN_ON_ONCE(!page)) | |
1337 | continue; | |
1338 | ||
1339 | if (page->mapping) | |
1340 | page->mapping = NULL; | |
1341 | } | |
1342 | ||
1343 | /* last mapping -- drop user_count */ | |
1344 | atomic_dec(&msc->user_count); | |
1345 | mutex_unlock(&msc->buf_mutex); | |
1346 | } | |
1347 | ||
42df0509 | 1348 | static vm_fault_t msc_mmap_fault(struct vm_fault *vmf) |
ba82664c | 1349 | { |
11bac800 | 1350 | struct msc_iter *iter = vmf->vma->vm_file->private_data; |
ba82664c AS |
1351 | struct msc *msc = iter->msc; |
1352 | ||
1353 | vmf->page = msc_buffer_get_page(msc, vmf->pgoff); | |
1354 | if (!vmf->page) | |
1355 | return VM_FAULT_SIGBUS; | |
1356 | ||
1357 | get_page(vmf->page); | |
11bac800 | 1358 | vmf->page->mapping = vmf->vma->vm_file->f_mapping; |
ba82664c AS |
1359 | vmf->page->index = vmf->pgoff; |
1360 | ||
1361 | return 0; | |
1362 | } | |
1363 | ||
1364 | static const struct vm_operations_struct msc_mmap_ops = { | |
1365 | .open = msc_mmap_open, | |
1366 | .close = msc_mmap_close, | |
1367 | .fault = msc_mmap_fault, | |
1368 | }; | |
1369 | ||
1370 | static int intel_th_msc_mmap(struct file *file, struct vm_area_struct *vma) | |
1371 | { | |
1372 | unsigned long size = vma->vm_end - vma->vm_start; | |
1373 | struct msc_iter *iter = vma->vm_file->private_data; | |
1374 | struct msc *msc = iter->msc; | |
1375 | int ret = -EINVAL; | |
1376 | ||
1377 | if (!size || offset_in_page(size)) | |
1378 | return -EINVAL; | |
1379 | ||
1380 | if (vma->vm_pgoff) | |
1381 | return -EINVAL; | |
1382 | ||
1383 | /* grab user_count once per mmap; drop in msc_mmap_close() */ | |
1384 | if (!atomic_inc_unless_negative(&msc->user_count)) | |
1385 | return -EINVAL; | |
1386 | ||
1387 | if (msc->mode != MSC_MODE_SINGLE && | |
1388 | msc->mode != MSC_MODE_MULTI) | |
1389 | goto out; | |
1390 | ||
1391 | if (size >> PAGE_SHIFT != msc->nr_pages) | |
1392 | goto out; | |
1393 | ||
1394 | atomic_set(&msc->mmap_count, 1); | |
1395 | ret = 0; | |
1396 | ||
1397 | out: | |
1398 | if (ret) | |
1399 | atomic_dec(&msc->user_count); | |
1400 | ||
1401 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1402 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTCOPY; | |
1403 | vma->vm_ops = &msc_mmap_ops; | |
1404 | return ret; | |
1405 | } | |
1406 | ||
1407 | static const struct file_operations intel_th_msc_fops = { | |
1408 | .open = intel_th_msc_open, | |
1409 | .release = intel_th_msc_release, | |
1410 | .read = intel_th_msc_read, | |
1411 | .mmap = intel_th_msc_mmap, | |
1412 | .llseek = no_llseek, | |
8e9a2beb | 1413 | .owner = THIS_MODULE, |
ba82664c AS |
1414 | }; |
1415 | ||
8d415512 AS |
1416 | static void intel_th_msc_wait_empty(struct intel_th_device *thdev) |
1417 | { | |
1418 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
1419 | unsigned long count; | |
1420 | u32 reg; | |
1421 | ||
1422 | for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH; | |
1423 | count && !(reg & MSCSTS_PLE); count--) { | |
1424 | reg = __raw_readl(msc->reg_base + REG_MSU_MSC0STS); | |
1425 | cpu_relax(); | |
1426 | } | |
1427 | ||
1428 | if (!count) | |
1429 | dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n"); | |
1430 | } | |
1431 | ||
ba82664c AS |
1432 | static int intel_th_msc_init(struct msc *msc) |
1433 | { | |
1434 | atomic_set(&msc->user_count, -1); | |
1435 | ||
1436 | msc->mode = MSC_MODE_MULTI; | |
1437 | mutex_init(&msc->buf_mutex); | |
1438 | INIT_LIST_HEAD(&msc->win_list); | |
ba82664c AS |
1439 | INIT_LIST_HEAD(&msc->iter_list); |
1440 | ||
1441 | msc->burst_len = | |
1442 | (ioread32(msc->reg_base + REG_MSU_MSC0CTL) & MSC_LEN) >> | |
1443 | __ffs(MSC_LEN); | |
1444 | ||
1445 | return 0; | |
1446 | } | |
1447 | ||
aad14ad3 AS |
1448 | static void msc_win_switch(struct msc *msc) |
1449 | { | |
9800db28 | 1450 | struct msc_window *first; |
aad14ad3 AS |
1451 | |
1452 | first = list_first_entry(&msc->win_list, struct msc_window, entry); | |
aad14ad3 AS |
1453 | |
1454 | if (msc_is_last_win(msc->cur_win)) | |
1455 | msc->cur_win = first; | |
1456 | else | |
1457 | msc->cur_win = list_next_entry(msc->cur_win, entry); | |
1458 | ||
1459 | msc->base = msc_win_block(msc->cur_win, 0); | |
1460 | msc->base_addr = msc_win_baddr(msc->cur_win, 0); | |
1461 | ||
1462 | intel_th_trace_switch(msc->thdev); | |
1463 | } | |
1464 | ||
aac8da65 AS |
1465 | static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev) |
1466 | { | |
1467 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
1468 | u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); | |
1469 | u32 mask = msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; | |
1470 | ||
1471 | if (!(msusts & mask)) { | |
1472 | if (msc->enabled) | |
1473 | return IRQ_HANDLED; | |
1474 | return IRQ_NONE; | |
1475 | } | |
1476 | ||
1477 | return IRQ_HANDLED; | |
1478 | } | |
1479 | ||
ba82664c AS |
1480 | static const char * const msc_mode[] = { |
1481 | [MSC_MODE_SINGLE] = "single", | |
1482 | [MSC_MODE_MULTI] = "multi", | |
1483 | [MSC_MODE_EXI] = "ExI", | |
1484 | [MSC_MODE_DEBUG] = "debug", | |
1485 | }; | |
1486 | ||
1487 | static ssize_t | |
1488 | wrap_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1489 | { | |
1490 | struct msc *msc = dev_get_drvdata(dev); | |
1491 | ||
1492 | return scnprintf(buf, PAGE_SIZE, "%d\n", msc->wrap); | |
1493 | } | |
1494 | ||
1495 | static ssize_t | |
1496 | wrap_store(struct device *dev, struct device_attribute *attr, const char *buf, | |
1497 | size_t size) | |
1498 | { | |
1499 | struct msc *msc = dev_get_drvdata(dev); | |
1500 | unsigned long val; | |
1501 | int ret; | |
1502 | ||
1503 | ret = kstrtoul(buf, 10, &val); | |
1504 | if (ret) | |
1505 | return ret; | |
1506 | ||
1507 | msc->wrap = !!val; | |
1508 | ||
1509 | return size; | |
1510 | } | |
1511 | ||
1512 | static DEVICE_ATTR_RW(wrap); | |
1513 | ||
1514 | static ssize_t | |
1515 | mode_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1516 | { | |
1517 | struct msc *msc = dev_get_drvdata(dev); | |
1518 | ||
1519 | return scnprintf(buf, PAGE_SIZE, "%s\n", msc_mode[msc->mode]); | |
1520 | } | |
1521 | ||
1522 | static ssize_t | |
1523 | mode_store(struct device *dev, struct device_attribute *attr, const char *buf, | |
1524 | size_t size) | |
1525 | { | |
1526 | struct msc *msc = dev_get_drvdata(dev); | |
1527 | size_t len = size; | |
1528 | char *cp; | |
1529 | int i, ret; | |
1530 | ||
1531 | if (!capable(CAP_SYS_RAWIO)) | |
1532 | return -EPERM; | |
1533 | ||
1534 | cp = memchr(buf, '\n', len); | |
1535 | if (cp) | |
1536 | len = cp - buf; | |
1537 | ||
1538 | for (i = 0; i < ARRAY_SIZE(msc_mode); i++) | |
1539 | if (!strncmp(msc_mode[i], buf, len)) | |
1540 | goto found; | |
1541 | ||
1542 | return -EINVAL; | |
1543 | ||
1544 | found: | |
1545 | mutex_lock(&msc->buf_mutex); | |
1546 | ret = msc_buffer_unlocked_free_unless_used(msc); | |
1547 | if (!ret) | |
1548 | msc->mode = i; | |
1549 | mutex_unlock(&msc->buf_mutex); | |
1550 | ||
1551 | return ret ? ret : size; | |
1552 | } | |
1553 | ||
1554 | static DEVICE_ATTR_RW(mode); | |
1555 | ||
1556 | static ssize_t | |
1557 | nr_pages_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1558 | { | |
1559 | struct msc *msc = dev_get_drvdata(dev); | |
1560 | struct msc_window *win; | |
1561 | size_t count = 0; | |
1562 | ||
1563 | mutex_lock(&msc->buf_mutex); | |
1564 | ||
1565 | if (msc->mode == MSC_MODE_SINGLE) | |
1566 | count = scnprintf(buf, PAGE_SIZE, "%ld\n", msc->nr_pages); | |
1567 | else if (msc->mode == MSC_MODE_MULTI) { | |
1568 | list_for_each_entry(win, &msc->win_list, entry) { | |
1569 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1570 | "%d%c", win->nr_blocks, | |
1571 | msc_is_last_win(win) ? '\n' : ','); | |
1572 | } | |
1573 | } else { | |
1574 | count = scnprintf(buf, PAGE_SIZE, "unsupported\n"); | |
1575 | } | |
1576 | ||
1577 | mutex_unlock(&msc->buf_mutex); | |
1578 | ||
1579 | return count; | |
1580 | } | |
1581 | ||
1582 | static ssize_t | |
1583 | nr_pages_store(struct device *dev, struct device_attribute *attr, | |
1584 | const char *buf, size_t size) | |
1585 | { | |
1586 | struct msc *msc = dev_get_drvdata(dev); | |
1587 | unsigned long val, *win = NULL, *rewin; | |
1588 | size_t len = size; | |
1589 | const char *p = buf; | |
1590 | char *end, *s; | |
1591 | int ret, nr_wins = 0; | |
1592 | ||
1593 | if (!capable(CAP_SYS_RAWIO)) | |
1594 | return -EPERM; | |
1595 | ||
1596 | ret = msc_buffer_free_unless_used(msc); | |
1597 | if (ret) | |
1598 | return ret; | |
1599 | ||
1600 | /* scan the comma-separated list of allocation sizes */ | |
1601 | end = memchr(buf, '\n', len); | |
1602 | if (end) | |
1603 | len = end - buf; | |
1604 | ||
1605 | do { | |
1606 | end = memchr(p, ',', len); | |
1607 | s = kstrndup(p, end ? end - p : len, GFP_KERNEL); | |
6575cbd6 AS |
1608 | if (!s) { |
1609 | ret = -ENOMEM; | |
1610 | goto free_win; | |
1611 | } | |
1612 | ||
ba82664c AS |
1613 | ret = kstrtoul(s, 10, &val); |
1614 | kfree(s); | |
1615 | ||
1616 | if (ret || !val) | |
1617 | goto free_win; | |
1618 | ||
1619 | if (nr_wins && msc->mode == MSC_MODE_SINGLE) { | |
1620 | ret = -EINVAL; | |
1621 | goto free_win; | |
1622 | } | |
1623 | ||
1624 | nr_wins++; | |
1625 | rewin = krealloc(win, sizeof(*win) * nr_wins, GFP_KERNEL); | |
1626 | if (!rewin) { | |
1627 | kfree(win); | |
1628 | return -ENOMEM; | |
1629 | } | |
1630 | ||
1631 | win = rewin; | |
1632 | win[nr_wins - 1] = val; | |
1633 | ||
1634 | if (!end) | |
1635 | break; | |
1636 | ||
ec5b5ad6 AS |
1637 | /* consume the number and the following comma, hence +1 */ |
1638 | len -= end - p + 1; | |
ba82664c AS |
1639 | p = end + 1; |
1640 | } while (len); | |
1641 | ||
1642 | mutex_lock(&msc->buf_mutex); | |
1643 | ret = msc_buffer_alloc(msc, win, nr_wins); | |
1644 | mutex_unlock(&msc->buf_mutex); | |
1645 | ||
1646 | free_win: | |
1647 | kfree(win); | |
1648 | ||
1649 | return ret ? ret : size; | |
1650 | } | |
1651 | ||
1652 | static DEVICE_ATTR_RW(nr_pages); | |
1653 | ||
6cac7866 AS |
1654 | static ssize_t |
1655 | win_switch_store(struct device *dev, struct device_attribute *attr, | |
1656 | const char *buf, size_t size) | |
1657 | { | |
1658 | struct msc *msc = dev_get_drvdata(dev); | |
1659 | unsigned long val; | |
1660 | int ret; | |
1661 | ||
1662 | ret = kstrtoul(buf, 10, &val); | |
1663 | if (ret) | |
1664 | return ret; | |
1665 | ||
1666 | if (val != 1) | |
1667 | return -EINVAL; | |
1668 | ||
1669 | mutex_lock(&msc->buf_mutex); | |
1670 | if (msc->mode != MSC_MODE_MULTI) | |
1671 | ret = -ENOTSUPP; | |
1672 | else | |
aad14ad3 | 1673 | msc_win_switch(msc); |
6cac7866 AS |
1674 | mutex_unlock(&msc->buf_mutex); |
1675 | ||
1676 | return ret ? ret : size; | |
1677 | } | |
1678 | ||
1679 | static DEVICE_ATTR_WO(win_switch); | |
1680 | ||
ba82664c AS |
1681 | static struct attribute *msc_output_attrs[] = { |
1682 | &dev_attr_wrap.attr, | |
1683 | &dev_attr_mode.attr, | |
1684 | &dev_attr_nr_pages.attr, | |
6cac7866 | 1685 | &dev_attr_win_switch.attr, |
ba82664c AS |
1686 | NULL, |
1687 | }; | |
1688 | ||
1689 | static struct attribute_group msc_output_group = { | |
1690 | .attrs = msc_output_attrs, | |
1691 | }; | |
1692 | ||
1693 | static int intel_th_msc_probe(struct intel_th_device *thdev) | |
1694 | { | |
1695 | struct device *dev = &thdev->dev; | |
1696 | struct resource *res; | |
1697 | struct msc *msc; | |
1698 | void __iomem *base; | |
1699 | int err; | |
1700 | ||
1701 | res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); | |
1702 | if (!res) | |
1703 | return -ENODEV; | |
1704 | ||
1705 | base = devm_ioremap(dev, res->start, resource_size(res)); | |
73061da0 DC |
1706 | if (!base) |
1707 | return -ENOMEM; | |
ba82664c AS |
1708 | |
1709 | msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL); | |
1710 | if (!msc) | |
1711 | return -ENOMEM; | |
1712 | ||
aac8da65 AS |
1713 | res = intel_th_device_get_resource(thdev, IORESOURCE_IRQ, 1); |
1714 | if (!res) | |
1715 | msc->do_irq = 1; | |
1716 | ||
ba82664c AS |
1717 | msc->index = thdev->id; |
1718 | ||
1719 | msc->thdev = thdev; | |
1720 | msc->reg_base = base + msc->index * 0x100; | |
aac8da65 AS |
1721 | msc->msu_base = base; |
1722 | ||
1723 | err = intel_th_msu_init(msc); | |
1724 | if (err) | |
1725 | return err; | |
ba82664c AS |
1726 | |
1727 | err = intel_th_msc_init(msc); | |
1728 | if (err) | |
1729 | return err; | |
1730 | ||
ba82664c AS |
1731 | dev_set_drvdata(dev, msc); |
1732 | ||
1733 | return 0; | |
1734 | } | |
1735 | ||
1736 | static void intel_th_msc_remove(struct intel_th_device *thdev) | |
1737 | { | |
f152dfee AS |
1738 | struct msc *msc = dev_get_drvdata(&thdev->dev); |
1739 | int ret; | |
1740 | ||
1741 | intel_th_msc_deactivate(thdev); | |
aac8da65 | 1742 | intel_th_msu_deinit(msc); |
f152dfee AS |
1743 | |
1744 | /* | |
1745 | * Buffers should not be used at this point except if the | |
1746 | * output character device is still open and the parent | |
1747 | * device gets detached from its bus, which is a FIXME. | |
1748 | */ | |
1749 | ret = msc_buffer_free_unless_used(msc); | |
1750 | WARN_ON_ONCE(ret); | |
ba82664c AS |
1751 | } |
1752 | ||
1753 | static struct intel_th_driver intel_th_msc_driver = { | |
1754 | .probe = intel_th_msc_probe, | |
1755 | .remove = intel_th_msc_remove, | |
aac8da65 | 1756 | .irq = intel_th_msc_interrupt, |
8d415512 | 1757 | .wait_empty = intel_th_msc_wait_empty, |
ba82664c AS |
1758 | .activate = intel_th_msc_activate, |
1759 | .deactivate = intel_th_msc_deactivate, | |
1760 | .fops = &intel_th_msc_fops, | |
9d482aed | 1761 | .attr_group = &msc_output_group, |
ba82664c AS |
1762 | .driver = { |
1763 | .name = "msc", | |
1764 | .owner = THIS_MODULE, | |
1765 | }, | |
1766 | }; | |
1767 | ||
1768 | module_driver(intel_th_msc_driver, | |
1769 | intel_th_driver_register, | |
1770 | intel_th_driver_unregister); | |
1771 | ||
1772 | MODULE_LICENSE("GPL v2"); | |
1773 | MODULE_DESCRIPTION("Intel(R) Trace Hub Memory Storage Unit driver"); | |
1774 | MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); |