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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> | |
615c164d | 20 | #include <linux/workqueue.h> |
ba82664c AS |
21 | #include <linux/dma-mapping.h> |
22 | ||
0c14dac9 LA |
23 | #ifdef CONFIG_X86 |
24 | #include <asm/set_memory.h> | |
25 | #endif | |
ba82664c | 26 | |
615c164d | 27 | #include <linux/intel_th.h> |
ba82664c AS |
28 | #include "intel_th.h" |
29 | #include "msu.h" | |
30 | ||
31 | #define msc_dev(x) (&(x)->thdev->dev) | |
32 | ||
615c164d AS |
33 | /* |
34 | * Lockout state transitions: | |
35 | * READY -> INUSE -+-> LOCKED -+-> READY -> etc. | |
36 | * \-----------/ | |
37 | * WIN_READY: window can be used by HW | |
38 | * WIN_INUSE: window is in use | |
39 | * WIN_LOCKED: window is filled up and is being processed by the buffer | |
40 | * handling code | |
41 | * | |
42 | * All state transitions happen automatically, except for the LOCKED->READY, | |
43 | * which needs to be signalled by the buffer code by calling | |
44 | * intel_th_msc_window_unlock(). | |
45 | * | |
46 | * When the interrupt handler has to switch to the next window, it checks | |
47 | * whether it's READY, and if it is, it performs the switch and tracing | |
48 | * continues. If it's LOCKED, it stops the trace. | |
49 | */ | |
50 | enum lockout_state { | |
51 | WIN_READY = 0, | |
52 | WIN_INUSE, | |
53 | WIN_LOCKED | |
54 | }; | |
55 | ||
ba82664c AS |
56 | /** |
57 | * struct msc_window - multiblock mode window descriptor | |
58 | * @entry: window list linkage (msc::win_list) | |
59 | * @pgoff: page offset into the buffer that this window starts at | |
615c164d AS |
60 | * @lockout: lockout state, see comment below |
61 | * @lo_lock: lockout state serialization | |
ba82664c | 62 | * @nr_blocks: number of blocks (pages) in this window |
fa52b3fe | 63 | * @nr_segs: number of segments in this window (<= @nr_blocks) |
bbbc08a1 | 64 | * @_sgt: array of block descriptors |
ba39bd83 | 65 | * @sgt: array of block descriptors |
ba82664c AS |
66 | */ |
67 | struct msc_window { | |
68 | struct list_head entry; | |
69 | unsigned long pgoff; | |
615c164d AS |
70 | enum lockout_state lockout; |
71 | spinlock_t lo_lock; | |
ba82664c | 72 | unsigned int nr_blocks; |
fa52b3fe | 73 | unsigned int nr_segs; |
ba82664c | 74 | struct msc *msc; |
bbbc08a1 AS |
75 | struct sg_table _sgt; |
76 | struct sg_table *sgt; | |
ba82664c AS |
77 | }; |
78 | ||
79 | /** | |
80 | * struct msc_iter - iterator for msc buffer | |
81 | * @entry: msc::iter_list linkage | |
82 | * @msc: pointer to the MSC device | |
83 | * @start_win: oldest window | |
84 | * @win: current window | |
85 | * @offset: current logical offset into the buffer | |
86 | * @start_block: oldest block in the window | |
87 | * @block: block number in the window | |
88 | * @block_off: offset into current block | |
89 | * @wrap_count: block wrapping handling | |
90 | * @eof: end of buffer reached | |
91 | */ | |
92 | struct msc_iter { | |
93 | struct list_head entry; | |
94 | struct msc *msc; | |
95 | struct msc_window *start_win; | |
96 | struct msc_window *win; | |
97 | unsigned long offset; | |
57b69a1f AS |
98 | struct scatterlist *start_block; |
99 | struct scatterlist *block; | |
ba82664c AS |
100 | unsigned int block_off; |
101 | unsigned int wrap_count; | |
102 | unsigned int eof; | |
103 | }; | |
104 | ||
105 | /** | |
106 | * struct msc - MSC device representation | |
107 | * @reg_base: register window base address | |
108 | * @thdev: intel_th_device pointer | |
615c164d AS |
109 | * @mbuf: MSU buffer, if assigned |
110 | * @mbuf_priv MSU buffer's private data, if @mbuf | |
ba82664c | 111 | * @win_list: list of windows in multiblock mode |
4e0eaf23 | 112 | * @single_sgt: single mode buffer |
aad14ad3 | 113 | * @cur_win: current window |
ba82664c AS |
114 | * @nr_pages: total number of pages allocated for this buffer |
115 | * @single_sz: amount of data in single mode | |
116 | * @single_wrap: single mode wrap occurred | |
117 | * @base: buffer's base pointer | |
118 | * @base_addr: buffer's base address | |
119 | * @user_count: number of users of the buffer | |
120 | * @mmap_count: number of mappings | |
121 | * @buf_mutex: mutex to serialize access to buffer-related bits | |
122 | ||
123 | * @enabled: MSC is enabled | |
124 | * @wrap: wrapping is enabled | |
125 | * @mode: MSC operating mode | |
126 | * @burst_len: write burst length | |
127 | * @index: number of this MSC in the MSU | |
128 | */ | |
129 | struct msc { | |
130 | void __iomem *reg_base; | |
aac8da65 | 131 | void __iomem *msu_base; |
ba82664c AS |
132 | struct intel_th_device *thdev; |
133 | ||
615c164d AS |
134 | const struct msu_buffer *mbuf; |
135 | void *mbuf_priv; | |
136 | ||
137 | struct work_struct work; | |
ba82664c | 138 | struct list_head win_list; |
4e0eaf23 | 139 | struct sg_table single_sgt; |
aad14ad3 | 140 | struct msc_window *cur_win; |
ba82664c AS |
141 | unsigned long nr_pages; |
142 | unsigned long single_sz; | |
143 | unsigned int single_wrap : 1; | |
144 | void *base; | |
145 | dma_addr_t base_addr; | |
092f47c3 AS |
146 | u32 orig_addr; |
147 | u32 orig_sz; | |
ba82664c AS |
148 | |
149 | /* <0: no buffer, 0: no users, >0: active users */ | |
150 | atomic_t user_count; | |
151 | ||
152 | atomic_t mmap_count; | |
153 | struct mutex buf_mutex; | |
154 | ||
ba82664c AS |
155 | struct list_head iter_list; |
156 | ||
157 | /* config */ | |
158 | unsigned int enabled : 1, | |
aac8da65 AS |
159 | wrap : 1, |
160 | do_irq : 1; | |
ba82664c AS |
161 | unsigned int mode; |
162 | unsigned int burst_len; | |
163 | unsigned int index; | |
164 | }; | |
165 | ||
615c164d | 166 | static LIST_HEAD(msu_buffer_list); |
e5a340f7 | 167 | static DEFINE_MUTEX(msu_buffer_mutex); |
615c164d AS |
168 | |
169 | /** | |
170 | * struct msu_buffer_entry - internal MSU buffer bookkeeping | |
171 | * @entry: link to msu_buffer_list | |
172 | * @mbuf: MSU buffer object | |
173 | * @owner: module that provides this MSU buffer | |
174 | */ | |
175 | struct msu_buffer_entry { | |
176 | struct list_head entry; | |
177 | const struct msu_buffer *mbuf; | |
178 | struct module *owner; | |
179 | }; | |
180 | ||
181 | static struct msu_buffer_entry *__msu_buffer_entry_find(const char *name) | |
182 | { | |
183 | struct msu_buffer_entry *mbe; | |
184 | ||
185 | lockdep_assert_held(&msu_buffer_mutex); | |
186 | ||
187 | list_for_each_entry(mbe, &msu_buffer_list, entry) { | |
188 | if (!strcmp(mbe->mbuf->name, name)) | |
189 | return mbe; | |
190 | } | |
191 | ||
192 | return NULL; | |
193 | } | |
194 | ||
195 | static const struct msu_buffer * | |
196 | msu_buffer_get(const char *name) | |
197 | { | |
198 | struct msu_buffer_entry *mbe; | |
199 | ||
200 | mutex_lock(&msu_buffer_mutex); | |
201 | mbe = __msu_buffer_entry_find(name); | |
202 | if (mbe && !try_module_get(mbe->owner)) | |
203 | mbe = NULL; | |
204 | mutex_unlock(&msu_buffer_mutex); | |
205 | ||
206 | return mbe ? mbe->mbuf : NULL; | |
207 | } | |
208 | ||
209 | static void msu_buffer_put(const struct msu_buffer *mbuf) | |
210 | { | |
211 | struct msu_buffer_entry *mbe; | |
212 | ||
213 | mutex_lock(&msu_buffer_mutex); | |
214 | mbe = __msu_buffer_entry_find(mbuf->name); | |
215 | if (mbe) | |
216 | module_put(mbe->owner); | |
217 | mutex_unlock(&msu_buffer_mutex); | |
218 | } | |
219 | ||
220 | int intel_th_msu_buffer_register(const struct msu_buffer *mbuf, | |
221 | struct module *owner) | |
222 | { | |
223 | struct msu_buffer_entry *mbe; | |
224 | int ret = 0; | |
225 | ||
226 | mbe = kzalloc(sizeof(*mbe), GFP_KERNEL); | |
227 | if (!mbe) | |
228 | return -ENOMEM; | |
229 | ||
230 | mutex_lock(&msu_buffer_mutex); | |
231 | if (__msu_buffer_entry_find(mbuf->name)) { | |
232 | ret = -EEXIST; | |
233 | kfree(mbe); | |
234 | goto unlock; | |
235 | } | |
236 | ||
237 | mbe->mbuf = mbuf; | |
238 | mbe->owner = owner; | |
239 | list_add_tail(&mbe->entry, &msu_buffer_list); | |
240 | unlock: | |
241 | mutex_unlock(&msu_buffer_mutex); | |
242 | ||
243 | return ret; | |
244 | } | |
245 | EXPORT_SYMBOL_GPL(intel_th_msu_buffer_register); | |
246 | ||
247 | void intel_th_msu_buffer_unregister(const struct msu_buffer *mbuf) | |
248 | { | |
249 | struct msu_buffer_entry *mbe; | |
250 | ||
251 | mutex_lock(&msu_buffer_mutex); | |
252 | mbe = __msu_buffer_entry_find(mbuf->name); | |
253 | if (mbe) { | |
254 | list_del(&mbe->entry); | |
255 | kfree(mbe); | |
256 | } | |
257 | mutex_unlock(&msu_buffer_mutex); | |
258 | } | |
259 | EXPORT_SYMBOL_GPL(intel_th_msu_buffer_unregister); | |
260 | ||
ba82664c AS |
261 | static inline bool msc_block_is_empty(struct msc_block_desc *bdesc) |
262 | { | |
263 | /* header hasn't been written */ | |
264 | if (!bdesc->valid_dw) | |
265 | return true; | |
266 | ||
267 | /* valid_dw includes the header */ | |
268 | if (!msc_data_sz(bdesc)) | |
269 | return true; | |
270 | ||
271 | return false; | |
272 | } | |
273 | ||
57b69a1f | 274 | static inline struct scatterlist *msc_win_base_sg(struct msc_window *win) |
ba39bd83 | 275 | { |
57b69a1f | 276 | return win->sgt->sgl; |
ba39bd83 AS |
277 | } |
278 | ||
57b69a1f | 279 | static inline struct msc_block_desc *msc_win_base(struct msc_window *win) |
fa52b3fe | 280 | { |
57b69a1f | 281 | return sg_virt(msc_win_base_sg(win)); |
fa52b3fe AS |
282 | } |
283 | ||
57b69a1f | 284 | static inline dma_addr_t msc_win_base_dma(struct msc_window *win) |
ba39bd83 | 285 | { |
57b69a1f | 286 | return sg_dma_address(msc_win_base_sg(win)); |
ba39bd83 AS |
287 | } |
288 | ||
289 | static inline unsigned long | |
57b69a1f | 290 | msc_win_base_pfn(struct msc_window *win) |
ba39bd83 | 291 | { |
57b69a1f | 292 | return PFN_DOWN(msc_win_base_dma(win)); |
ba39bd83 AS |
293 | } |
294 | ||
aad14ad3 AS |
295 | /** |
296 | * msc_is_last_win() - check if a window is the last one for a given MSC | |
297 | * @win: window | |
298 | * Return: true if @win is the last window in MSC's multiblock buffer | |
299 | */ | |
300 | static inline bool msc_is_last_win(struct msc_window *win) | |
301 | { | |
302 | return win->entry.next == &win->msc->win_list; | |
303 | } | |
304 | ||
305 | /** | |
306 | * msc_next_window() - return next window in the multiblock buffer | |
307 | * @win: current window | |
308 | * | |
309 | * Return: window following the current one | |
310 | */ | |
311 | static struct msc_window *msc_next_window(struct msc_window *win) | |
312 | { | |
313 | if (msc_is_last_win(win)) | |
314 | return list_first_entry(&win->msc->win_list, struct msc_window, | |
315 | entry); | |
316 | ||
317 | return list_next_entry(win, entry); | |
318 | } | |
319 | ||
615c164d AS |
320 | static size_t msc_win_total_sz(struct msc_window *win) |
321 | { | |
57b69a1f | 322 | struct scatterlist *sg; |
615c164d AS |
323 | unsigned int blk; |
324 | size_t size = 0; | |
325 | ||
57b69a1f AS |
326 | for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
327 | struct msc_block_desc *bdesc = sg_virt(sg); | |
615c164d AS |
328 | |
329 | if (msc_block_wrapped(bdesc)) | |
8e3ef7b4 | 330 | return (size_t)win->nr_blocks << PAGE_SHIFT; |
615c164d AS |
331 | |
332 | size += msc_total_sz(bdesc); | |
333 | if (msc_block_last_written(bdesc)) | |
334 | break; | |
335 | } | |
336 | ||
337 | return size; | |
338 | } | |
339 | ||
ba82664c | 340 | /** |
f505e91e | 341 | * msc_find_window() - find a window matching a given sg_table |
ba82664c | 342 | * @msc: MSC device |
f505e91e AS |
343 | * @sgt: SG table of the window |
344 | * @nonempty: skip over empty windows | |
ba82664c | 345 | * |
f505e91e AS |
346 | * Return: MSC window structure pointer or NULL if the window |
347 | * could not be found. | |
ba82664c | 348 | */ |
f505e91e AS |
349 | static struct msc_window * |
350 | msc_find_window(struct msc *msc, struct sg_table *sgt, bool nonempty) | |
ba82664c | 351 | { |
f505e91e | 352 | struct msc_window *win; |
ba82664c AS |
353 | unsigned int found = 0; |
354 | ||
355 | if (list_empty(&msc->win_list)) | |
356 | return NULL; | |
357 | ||
358 | /* | |
359 | * we might need a radix tree for this, depending on how | |
360 | * many windows a typical user would allocate; ideally it's | |
361 | * something like 2, in which case we're good | |
362 | */ | |
363 | list_for_each_entry(win, &msc->win_list, entry) { | |
f505e91e | 364 | if (win->sgt == sgt) |
ba82664c AS |
365 | found++; |
366 | ||
367 | /* skip the empty ones */ | |
57b69a1f | 368 | if (nonempty && msc_block_is_empty(msc_win_base(win))) |
ba82664c AS |
369 | continue; |
370 | ||
371 | if (found) | |
372 | return win; | |
373 | } | |
374 | ||
f505e91e AS |
375 | return NULL; |
376 | } | |
377 | ||
378 | /** | |
379 | * msc_oldest_window() - locate the window with oldest data | |
380 | * @msc: MSC device | |
381 | * | |
382 | * This should only be used in multiblock mode. Caller should hold the | |
383 | * msc::user_count reference. | |
384 | * | |
385 | * Return: the oldest window with valid data | |
386 | */ | |
387 | static struct msc_window *msc_oldest_window(struct msc *msc) | |
388 | { | |
389 | struct msc_window *win; | |
390 | ||
391 | if (list_empty(&msc->win_list)) | |
392 | return NULL; | |
393 | ||
394 | win = msc_find_window(msc, msc_next_window(msc->cur_win)->sgt, true); | |
395 | if (win) | |
396 | return win; | |
397 | ||
0de9e035 | 398 | return list_first_entry(&msc->win_list, struct msc_window, entry); |
ba82664c AS |
399 | } |
400 | ||
401 | /** | |
57b69a1f | 402 | * msc_win_oldest_sg() - locate the oldest block in a given window |
ba82664c AS |
403 | * @win: window to look at |
404 | * | |
405 | * Return: index of the block with the oldest data | |
406 | */ | |
57b69a1f | 407 | static struct scatterlist *msc_win_oldest_sg(struct msc_window *win) |
ba82664c AS |
408 | { |
409 | unsigned int blk; | |
57b69a1f AS |
410 | struct scatterlist *sg; |
411 | struct msc_block_desc *bdesc = msc_win_base(win); | |
ba82664c AS |
412 | |
413 | /* without wrapping, first block is the oldest */ | |
414 | if (!msc_block_wrapped(bdesc)) | |
57b69a1f | 415 | return msc_win_base_sg(win); |
ba82664c AS |
416 | |
417 | /* | |
418 | * with wrapping, last written block contains both the newest and the | |
419 | * oldest data for this window. | |
420 | */ | |
57b69a1f AS |
421 | for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
422 | struct msc_block_desc *bdesc = sg_virt(sg); | |
ba82664c AS |
423 | |
424 | if (msc_block_last_written(bdesc)) | |
57b69a1f | 425 | return sg; |
ba82664c AS |
426 | } |
427 | ||
57b69a1f | 428 | return msc_win_base_sg(win); |
ba82664c AS |
429 | } |
430 | ||
ba82664c AS |
431 | static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter) |
432 | { | |
57b69a1f | 433 | return sg_virt(iter->block); |
ba82664c AS |
434 | } |
435 | ||
436 | static struct msc_iter *msc_iter_install(struct msc *msc) | |
437 | { | |
438 | struct msc_iter *iter; | |
439 | ||
440 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
441 | if (!iter) | |
a45ff6ed AS |
442 | return ERR_PTR(-ENOMEM); |
443 | ||
444 | mutex_lock(&msc->buf_mutex); | |
445 | ||
446 | /* | |
447 | * Reading and tracing are mutually exclusive; if msc is | |
448 | * enabled, open() will fail; otherwise existing readers | |
449 | * will prevent enabling the msc and the rest of fops don't | |
450 | * need to worry about it. | |
451 | */ | |
452 | if (msc->enabled) { | |
453 | kfree(iter); | |
454 | iter = ERR_PTR(-EBUSY); | |
455 | goto unlock; | |
456 | } | |
ba82664c | 457 | |
ba82664c AS |
458 | iter->msc = msc; |
459 | ||
ba82664c | 460 | list_add_tail(&iter->entry, &msc->iter_list); |
a45ff6ed AS |
461 | unlock: |
462 | mutex_unlock(&msc->buf_mutex); | |
ba82664c AS |
463 | |
464 | return iter; | |
465 | } | |
466 | ||
467 | static void msc_iter_remove(struct msc_iter *iter, struct msc *msc) | |
468 | { | |
a45ff6ed | 469 | mutex_lock(&msc->buf_mutex); |
ba82664c | 470 | list_del(&iter->entry); |
a45ff6ed | 471 | mutex_unlock(&msc->buf_mutex); |
ba82664c AS |
472 | |
473 | kfree(iter); | |
474 | } | |
475 | ||
476 | static void msc_iter_block_start(struct msc_iter *iter) | |
477 | { | |
57b69a1f | 478 | if (iter->start_block) |
ba82664c AS |
479 | return; |
480 | ||
57b69a1f | 481 | iter->start_block = msc_win_oldest_sg(iter->win); |
ba82664c AS |
482 | iter->block = iter->start_block; |
483 | iter->wrap_count = 0; | |
484 | ||
485 | /* | |
486 | * start with the block with oldest data; if data has wrapped | |
487 | * in this window, it should be in this block | |
488 | */ | |
489 | if (msc_block_wrapped(msc_iter_bdesc(iter))) | |
490 | iter->wrap_count = 2; | |
491 | ||
492 | } | |
493 | ||
494 | static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc) | |
495 | { | |
496 | /* already started, nothing to do */ | |
497 | if (iter->start_win) | |
498 | return 0; | |
499 | ||
500 | iter->start_win = msc_oldest_window(msc); | |
501 | if (!iter->start_win) | |
502 | return -EINVAL; | |
503 | ||
504 | iter->win = iter->start_win; | |
57b69a1f | 505 | iter->start_block = NULL; |
ba82664c AS |
506 | |
507 | msc_iter_block_start(iter); | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
512 | static int msc_iter_win_advance(struct msc_iter *iter) | |
513 | { | |
514 | iter->win = msc_next_window(iter->win); | |
57b69a1f | 515 | iter->start_block = NULL; |
ba82664c AS |
516 | |
517 | if (iter->win == iter->start_win) { | |
518 | iter->eof++; | |
519 | return 1; | |
520 | } | |
521 | ||
522 | msc_iter_block_start(iter); | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | static int msc_iter_block_advance(struct msc_iter *iter) | |
528 | { | |
529 | iter->block_off = 0; | |
530 | ||
531 | /* wrapping */ | |
532 | if (iter->wrap_count && iter->block == iter->start_block) { | |
533 | iter->wrap_count--; | |
534 | if (!iter->wrap_count) | |
535 | /* copied newest data from the wrapped block */ | |
536 | return msc_iter_win_advance(iter); | |
537 | } | |
538 | ||
539 | /* no wrapping, check for last written block */ | |
540 | if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter))) | |
541 | /* copied newest data for the window */ | |
542 | return msc_iter_win_advance(iter); | |
543 | ||
544 | /* block advance */ | |
57b69a1f AS |
545 | if (sg_is_last(iter->block)) |
546 | iter->block = msc_win_base_sg(iter->win); | |
547 | else | |
548 | iter->block = sg_next(iter->block); | |
ba82664c AS |
549 | |
550 | /* no wrapping, sanity check in case there is no last written block */ | |
551 | if (!iter->wrap_count && iter->block == iter->start_block) | |
552 | return msc_iter_win_advance(iter); | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | /** | |
558 | * msc_buffer_iterate() - go through multiblock buffer's data | |
559 | * @iter: iterator structure | |
560 | * @size: amount of data to scan | |
561 | * @data: callback's private data | |
562 | * @fn: iterator callback | |
563 | * | |
564 | * This will start at the window which will be written to next (containing | |
565 | * the oldest data) and work its way to the current window, calling @fn | |
566 | * for each chunk of data as it goes. | |
567 | * | |
568 | * Caller should have msc::user_count reference to make sure the buffer | |
569 | * doesn't disappear from under us. | |
570 | * | |
571 | * Return: amount of data actually scanned. | |
572 | */ | |
573 | static ssize_t | |
574 | msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data, | |
575 | unsigned long (*fn)(void *, void *, size_t)) | |
576 | { | |
577 | struct msc *msc = iter->msc; | |
578 | size_t len = size; | |
579 | unsigned int advance; | |
580 | ||
581 | if (iter->eof) | |
582 | return 0; | |
583 | ||
584 | /* start with the oldest window */ | |
585 | if (msc_iter_win_start(iter, msc)) | |
586 | return 0; | |
587 | ||
588 | do { | |
589 | unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter)); | |
590 | void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC; | |
591 | size_t tocopy = data_bytes, copied = 0; | |
592 | size_t remaining = 0; | |
593 | ||
594 | advance = 1; | |
595 | ||
596 | /* | |
597 | * If block wrapping happened, we need to visit the last block | |
598 | * twice, because it contains both the oldest and the newest | |
599 | * data in this window. | |
600 | * | |
601 | * First time (wrap_count==2), in the very beginning, to collect | |
602 | * the oldest data, which is in the range | |
603 | * (data_bytes..DATA_IN_PAGE). | |
604 | * | |
605 | * Second time (wrap_count==1), it's just like any other block, | |
606 | * containing data in the range of [MSC_BDESC..data_bytes]. | |
607 | */ | |
e4eca2a1 | 608 | if (iter->block == iter->start_block && iter->wrap_count == 2) { |
ba82664c AS |
609 | tocopy = DATA_IN_PAGE - data_bytes; |
610 | src += data_bytes; | |
611 | } | |
612 | ||
613 | if (!tocopy) | |
614 | goto next_block; | |
615 | ||
616 | tocopy -= iter->block_off; | |
617 | src += iter->block_off; | |
618 | ||
619 | if (len < tocopy) { | |
620 | tocopy = len; | |
621 | advance = 0; | |
622 | } | |
623 | ||
624 | remaining = fn(data, src, tocopy); | |
625 | ||
626 | if (remaining) | |
627 | advance = 0; | |
628 | ||
629 | copied = tocopy - remaining; | |
630 | len -= copied; | |
631 | iter->block_off += copied; | |
632 | iter->offset += copied; | |
633 | ||
634 | if (!advance) | |
635 | break; | |
636 | ||
637 | next_block: | |
638 | if (msc_iter_block_advance(iter)) | |
639 | break; | |
640 | ||
641 | } while (len); | |
642 | ||
643 | return size - len; | |
644 | } | |
645 | ||
646 | /** | |
647 | * msc_buffer_clear_hw_header() - clear hw header for multiblock | |
648 | * @msc: MSC device | |
649 | */ | |
650 | static void msc_buffer_clear_hw_header(struct msc *msc) | |
651 | { | |
652 | struct msc_window *win; | |
57b69a1f | 653 | struct scatterlist *sg; |
ba82664c | 654 | |
ba82664c AS |
655 | list_for_each_entry(win, &msc->win_list, entry) { |
656 | unsigned int blk; | |
657 | size_t hw_sz = sizeof(struct msc_block_desc) - | |
658 | offsetof(struct msc_block_desc, hw_tag); | |
659 | ||
57b69a1f AS |
660 | for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
661 | struct msc_block_desc *bdesc = sg_virt(sg); | |
ba82664c AS |
662 | |
663 | memset(&bdesc->hw_tag, 0, hw_sz); | |
664 | } | |
665 | } | |
ba82664c AS |
666 | } |
667 | ||
aac8da65 AS |
668 | static int intel_th_msu_init(struct msc *msc) |
669 | { | |
670 | u32 mintctl, msusts; | |
671 | ||
672 | if (!msc->do_irq) | |
673 | return 0; | |
674 | ||
615c164d AS |
675 | if (!msc->mbuf) |
676 | return 0; | |
677 | ||
aac8da65 AS |
678 | mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); |
679 | mintctl |= msc->index ? M1BLIE : M0BLIE; | |
680 | iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); | |
681 | if (mintctl != ioread32(msc->msu_base + REG_MSU_MINTCTL)) { | |
682 | dev_info(msc_dev(msc), "MINTCTL ignores writes: no usable interrupts\n"); | |
683 | msc->do_irq = 0; | |
684 | return 0; | |
685 | } | |
686 | ||
687 | msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); | |
688 | iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | static void intel_th_msu_deinit(struct msc *msc) | |
694 | { | |
695 | u32 mintctl; | |
696 | ||
697 | if (!msc->do_irq) | |
698 | return; | |
699 | ||
700 | mintctl = ioread32(msc->msu_base + REG_MSU_MINTCTL); | |
701 | mintctl &= msc->index ? ~M1BLIE : ~M0BLIE; | |
702 | iowrite32(mintctl, msc->msu_base + REG_MSU_MINTCTL); | |
703 | } | |
704 | ||
615c164d AS |
705 | static int msc_win_set_lockout(struct msc_window *win, |
706 | enum lockout_state expect, | |
707 | enum lockout_state new) | |
708 | { | |
709 | enum lockout_state old; | |
710 | unsigned long flags; | |
711 | int ret = 0; | |
712 | ||
713 | if (!win->msc->mbuf) | |
714 | return 0; | |
715 | ||
716 | spin_lock_irqsave(&win->lo_lock, flags); | |
717 | old = win->lockout; | |
718 | ||
719 | if (old != expect) { | |
720 | ret = -EINVAL; | |
615c164d AS |
721 | goto unlock; |
722 | } | |
723 | ||
724 | win->lockout = new; | |
725 | ||
ed5207af AS |
726 | if (old == expect && new == WIN_LOCKED) |
727 | atomic_inc(&win->msc->user_count); | |
728 | else if (old == expect && old == WIN_LOCKED) | |
729 | atomic_dec(&win->msc->user_count); | |
730 | ||
615c164d AS |
731 | unlock: |
732 | spin_unlock_irqrestore(&win->lo_lock, flags); | |
733 | ||
734 | if (ret) { | |
735 | if (expect == WIN_READY && old == WIN_LOCKED) | |
736 | return -EBUSY; | |
737 | ||
738 | /* from intel_th_msc_window_unlock(), don't warn if not locked */ | |
739 | if (expect == WIN_LOCKED && old == new) | |
740 | return 0; | |
885f1235 AS |
741 | |
742 | dev_warn_ratelimited(msc_dev(win->msc), | |
743 | "expected lockout state %d, got %d\n", | |
744 | expect, old); | |
615c164d AS |
745 | } |
746 | ||
747 | return ret; | |
748 | } | |
ba82664c AS |
749 | /** |
750 | * msc_configure() - set up MSC hardware | |
751 | * @msc: the MSC device to configure | |
752 | * | |
753 | * Program storage mode, wrapping, burst length and trace buffer address | |
a45ff6ed AS |
754 | * into a given MSC. Then, enable tracing and set msc::enabled. |
755 | * The latter is serialized on msc::buf_mutex, so make sure to hold it. | |
ba82664c AS |
756 | */ |
757 | static int msc_configure(struct msc *msc) | |
758 | { | |
759 | u32 reg; | |
760 | ||
a45ff6ed AS |
761 | lockdep_assert_held(&msc->buf_mutex); |
762 | ||
ba82664c | 763 | if (msc->mode > MSC_MODE_MULTI) |
ce666be8 | 764 | return -EINVAL; |
ba82664c | 765 | |
615c164d AS |
766 | if (msc->mode == MSC_MODE_MULTI) { |
767 | if (msc_win_set_lockout(msc->cur_win, WIN_READY, WIN_INUSE)) | |
768 | return -EBUSY; | |
769 | ||
ba82664c | 770 | msc_buffer_clear_hw_header(msc); |
615c164d | 771 | } |
ba82664c | 772 | |
092f47c3 AS |
773 | msc->orig_addr = ioread32(msc->reg_base + REG_MSU_MSC0BAR); |
774 | msc->orig_sz = ioread32(msc->reg_base + REG_MSU_MSC0SIZE); | |
775 | ||
ba82664c AS |
776 | reg = msc->base_addr >> PAGE_SHIFT; |
777 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR); | |
778 | ||
779 | if (msc->mode == MSC_MODE_SINGLE) { | |
780 | reg = msc->nr_pages; | |
781 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0SIZE); | |
782 | } | |
783 | ||
784 | reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); | |
785 | reg &= ~(MSC_MODE | MSC_WRAPEN | MSC_EN | MSC_RD_HDR_OVRD); | |
786 | ||
a45ff6ed | 787 | reg |= MSC_EN; |
ba82664c AS |
788 | reg |= msc->mode << __ffs(MSC_MODE); |
789 | reg |= msc->burst_len << __ffs(MSC_LEN); | |
a45ff6ed | 790 | |
ba82664c AS |
791 | if (msc->wrap) |
792 | reg |= MSC_WRAPEN; | |
ba82664c AS |
793 | |
794 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); | |
795 | ||
615c164d AS |
796 | intel_th_msu_init(msc); |
797 | ||
a45ff6ed AS |
798 | msc->thdev->output.multiblock = msc->mode == MSC_MODE_MULTI; |
799 | intel_th_trace_enable(msc->thdev); | |
800 | msc->enabled = 1; | |
801 | ||
615c164d AS |
802 | if (msc->mbuf && msc->mbuf->activate) |
803 | msc->mbuf->activate(msc->mbuf_priv); | |
ba82664c AS |
804 | |
805 | return 0; | |
806 | } | |
807 | ||
808 | /** | |
809 | * msc_disable() - disable MSC hardware | |
810 | * @msc: MSC device to disable | |
811 | * | |
812 | * If @msc is enabled, disable tracing on the switch and then disable MSC | |
a45ff6ed | 813 | * storage. Caller must hold msc::buf_mutex. |
ba82664c AS |
814 | */ |
815 | static void msc_disable(struct msc *msc) | |
816 | { | |
615c164d | 817 | struct msc_window *win = msc->cur_win; |
ba82664c AS |
818 | u32 reg; |
819 | ||
a45ff6ed | 820 | lockdep_assert_held(&msc->buf_mutex); |
ba82664c | 821 | |
615c164d AS |
822 | if (msc->mode == MSC_MODE_MULTI) |
823 | msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); | |
824 | ||
825 | if (msc->mbuf && msc->mbuf->deactivate) | |
826 | msc->mbuf->deactivate(msc->mbuf_priv); | |
827 | intel_th_msu_deinit(msc); | |
ba82664c AS |
828 | intel_th_trace_disable(msc->thdev); |
829 | ||
ba82664c | 830 | if (msc->mode == MSC_MODE_SINGLE) { |
8d415512 | 831 | reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); |
ba82664c AS |
832 | msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT); |
833 | ||
834 | reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP); | |
835 | msc->single_sz = reg & ((msc->nr_pages << PAGE_SHIFT) - 1); | |
836 | dev_dbg(msc_dev(msc), "MSCnMWP: %08x/%08lx, wrap: %d\n", | |
837 | reg, msc->single_sz, msc->single_wrap); | |
838 | } | |
839 | ||
840 | reg = ioread32(msc->reg_base + REG_MSU_MSC0CTL); | |
841 | reg &= ~MSC_EN; | |
842 | iowrite32(reg, msc->reg_base + REG_MSU_MSC0CTL); | |
615c164d AS |
843 | |
844 | if (msc->mbuf && msc->mbuf->ready) | |
845 | msc->mbuf->ready(msc->mbuf_priv, win->sgt, | |
846 | msc_win_total_sz(win)); | |
847 | ||
ba82664c AS |
848 | msc->enabled = 0; |
849 | ||
092f47c3 AS |
850 | iowrite32(msc->orig_addr, msc->reg_base + REG_MSU_MSC0BAR); |
851 | iowrite32(msc->orig_sz, msc->reg_base + REG_MSU_MSC0SIZE); | |
ba82664c AS |
852 | |
853 | dev_dbg(msc_dev(msc), "MSCnNWSA: %08x\n", | |
854 | ioread32(msc->reg_base + REG_MSU_MSC0NWSA)); | |
855 | ||
856 | reg = ioread32(msc->reg_base + REG_MSU_MSC0STS); | |
857 | dev_dbg(msc_dev(msc), "MSCnSTS: %08x\n", reg); | |
615c164d AS |
858 | |
859 | reg = ioread32(msc->reg_base + REG_MSU_MSUSTS); | |
860 | reg &= msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; | |
861 | iowrite32(reg, msc->reg_base + REG_MSU_MSUSTS); | |
ba82664c AS |
862 | } |
863 | ||
864 | static int intel_th_msc_activate(struct intel_th_device *thdev) | |
865 | { | |
866 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
a45ff6ed | 867 | int ret = -EBUSY; |
ba82664c AS |
868 | |
869 | if (!atomic_inc_unless_negative(&msc->user_count)) | |
870 | return -ENODEV; | |
871 | ||
a45ff6ed | 872 | mutex_lock(&msc->buf_mutex); |
ba82664c | 873 | |
a45ff6ed AS |
874 | /* if there are readers, refuse */ |
875 | if (list_empty(&msc->iter_list)) | |
876 | ret = msc_configure(msc); | |
ba82664c | 877 | |
a45ff6ed AS |
878 | mutex_unlock(&msc->buf_mutex); |
879 | ||
880 | if (ret) | |
881 | atomic_dec(&msc->user_count); | |
ba82664c | 882 | |
a45ff6ed | 883 | return ret; |
ba82664c AS |
884 | } |
885 | ||
886 | static void intel_th_msc_deactivate(struct intel_th_device *thdev) | |
887 | { | |
888 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
889 | ||
a45ff6ed AS |
890 | mutex_lock(&msc->buf_mutex); |
891 | if (msc->enabled) { | |
892 | msc_disable(msc); | |
893 | atomic_dec(&msc->user_count); | |
894 | } | |
895 | mutex_unlock(&msc->buf_mutex); | |
ba82664c AS |
896 | } |
897 | ||
898 | /** | |
899 | * msc_buffer_contig_alloc() - allocate a contiguous buffer for SINGLE mode | |
900 | * @msc: MSC device | |
901 | * @size: allocation size in bytes | |
902 | * | |
903 | * This modifies msc::base, which requires msc::buf_mutex to serialize, so the | |
904 | * caller is expected to hold it. | |
905 | * | |
906 | * Return: 0 on success, -errno otherwise. | |
907 | */ | |
908 | static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) | |
909 | { | |
4e0eaf23 | 910 | unsigned long nr_pages = size >> PAGE_SHIFT; |
ba82664c AS |
911 | unsigned int order = get_order(size); |
912 | struct page *page; | |
4e0eaf23 | 913 | int ret; |
ba82664c AS |
914 | |
915 | if (!size) | |
916 | return 0; | |
917 | ||
4e0eaf23 AS |
918 | ret = sg_alloc_table(&msc->single_sgt, 1, GFP_KERNEL); |
919 | if (ret) | |
920 | goto err_out; | |
921 | ||
922 | ret = -ENOMEM; | |
918b8646 | 923 | page = alloc_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32, order); |
ba82664c | 924 | if (!page) |
4e0eaf23 | 925 | goto err_free_sgt; |
ba82664c AS |
926 | |
927 | split_page(page, order); | |
4e0eaf23 AS |
928 | sg_set_buf(msc->single_sgt.sgl, page_address(page), size); |
929 | ||
930 | ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1, | |
931 | DMA_FROM_DEVICE); | |
932 | if (ret < 0) | |
933 | goto err_free_pages; | |
934 | ||
935 | msc->nr_pages = nr_pages; | |
ba82664c | 936 | msc->base = page_address(page); |
4e0eaf23 | 937 | msc->base_addr = sg_dma_address(msc->single_sgt.sgl); |
ba82664c AS |
938 | |
939 | return 0; | |
4e0eaf23 AS |
940 | |
941 | err_free_pages: | |
942 | __free_pages(page, order); | |
943 | ||
944 | err_free_sgt: | |
945 | sg_free_table(&msc->single_sgt); | |
946 | ||
947 | err_out: | |
948 | return ret; | |
ba82664c AS |
949 | } |
950 | ||
951 | /** | |
952 | * msc_buffer_contig_free() - free a contiguous buffer | |
953 | * @msc: MSC configured in SINGLE mode | |
954 | */ | |
955 | static void msc_buffer_contig_free(struct msc *msc) | |
956 | { | |
957 | unsigned long off; | |
958 | ||
4e0eaf23 AS |
959 | dma_unmap_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, |
960 | 1, DMA_FROM_DEVICE); | |
961 | sg_free_table(&msc->single_sgt); | |
962 | ||
ba82664c AS |
963 | for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { |
964 | struct page *page = virt_to_page(msc->base + off); | |
965 | ||
966 | page->mapping = NULL; | |
967 | __free_page(page); | |
968 | } | |
969 | ||
970 | msc->nr_pages = 0; | |
971 | } | |
972 | ||
973 | /** | |
974 | * msc_buffer_contig_get_page() - find a page at a given offset | |
975 | * @msc: MSC configured in SINGLE mode | |
976 | * @pgoff: page offset | |
977 | * | |
978 | * Return: page, if @pgoff is within the range, NULL otherwise. | |
979 | */ | |
980 | static struct page *msc_buffer_contig_get_page(struct msc *msc, | |
981 | unsigned long pgoff) | |
982 | { | |
983 | if (pgoff >= msc->nr_pages) | |
984 | return NULL; | |
985 | ||
986 | return virt_to_page(msc->base + (pgoff << PAGE_SHIFT)); | |
987 | } | |
988 | ||
ba39bd83 | 989 | static int __msc_buffer_win_alloc(struct msc_window *win, |
fa52b3fe | 990 | unsigned int nr_segs) |
ba39bd83 AS |
991 | { |
992 | struct scatterlist *sg_ptr; | |
993 | void *block; | |
994 | int i, ret; | |
995 | ||
bbbc08a1 | 996 | ret = sg_alloc_table(win->sgt, nr_segs, GFP_KERNEL); |
ba39bd83 AS |
997 | if (ret) |
998 | return -ENOMEM; | |
999 | ||
bbbc08a1 | 1000 | for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { |
ba39bd83 AS |
1001 | block = dma_alloc_coherent(msc_dev(win->msc)->parent->parent, |
1002 | PAGE_SIZE, &sg_dma_address(sg_ptr), | |
1003 | GFP_KERNEL); | |
1004 | if (!block) | |
1005 | goto err_nomem; | |
1006 | ||
1007 | sg_set_buf(sg_ptr, block, PAGE_SIZE); | |
1008 | } | |
1009 | ||
fa52b3fe | 1010 | return nr_segs; |
ba39bd83 AS |
1011 | |
1012 | err_nomem: | |
57b69a1f | 1013 | for_each_sg(win->sgt->sgl, sg_ptr, i, ret) |
ba39bd83 | 1014 | dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, |
57b69a1f | 1015 | sg_virt(sg_ptr), sg_dma_address(sg_ptr)); |
ba39bd83 | 1016 | |
bbbc08a1 | 1017 | sg_free_table(win->sgt); |
ba39bd83 AS |
1018 | |
1019 | return -ENOMEM; | |
1020 | } | |
1021 | ||
b96fb368 | 1022 | #ifdef CONFIG_X86 |
fa52b3fe | 1023 | static void msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) |
b96fb368 | 1024 | { |
57b69a1f | 1025 | struct scatterlist *sg_ptr; |
b96fb368 SZ |
1026 | int i; |
1027 | ||
57b69a1f | 1028 | for_each_sg(win->sgt->sgl, sg_ptr, nr_segs, i) { |
b96fb368 | 1029 | /* Set the page as uncached */ |
57b69a1f AS |
1030 | set_memory_uc((unsigned long)sg_virt(sg_ptr), |
1031 | PFN_DOWN(sg_ptr->length)); | |
1032 | } | |
b96fb368 SZ |
1033 | } |
1034 | ||
1035 | static void msc_buffer_set_wb(struct msc_window *win) | |
1036 | { | |
57b69a1f | 1037 | struct scatterlist *sg_ptr; |
b96fb368 SZ |
1038 | int i; |
1039 | ||
57b69a1f | 1040 | for_each_sg(win->sgt->sgl, sg_ptr, win->nr_segs, i) { |
b96fb368 | 1041 | /* Reset the page to write-back */ |
57b69a1f AS |
1042 | set_memory_wb((unsigned long)sg_virt(sg_ptr), |
1043 | PFN_DOWN(sg_ptr->length)); | |
1044 | } | |
b96fb368 SZ |
1045 | } |
1046 | #else /* !X86 */ | |
1047 | static inline void | |
fa52b3fe | 1048 | msc_buffer_set_uc(struct msc_window *win, unsigned int nr_segs) {} |
b96fb368 SZ |
1049 | static inline void msc_buffer_set_wb(struct msc_window *win) {} |
1050 | #endif /* CONFIG_X86 */ | |
1051 | ||
ba82664c AS |
1052 | /** |
1053 | * msc_buffer_win_alloc() - alloc a window for a multiblock mode | |
1054 | * @msc: MSC device | |
1055 | * @nr_blocks: number of pages in this window | |
1056 | * | |
1057 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex | |
1058 | * to serialize, so the caller is expected to hold it. | |
1059 | * | |
1060 | * Return: 0 on success, -errno otherwise. | |
1061 | */ | |
1062 | static int msc_buffer_win_alloc(struct msc *msc, unsigned int nr_blocks) | |
1063 | { | |
1064 | struct msc_window *win; | |
b96fb368 | 1065 | int ret = -ENOMEM; |
ba82664c AS |
1066 | |
1067 | if (!nr_blocks) | |
1068 | return 0; | |
1069 | ||
ba39bd83 | 1070 | win = kzalloc(sizeof(*win), GFP_KERNEL); |
ba82664c AS |
1071 | if (!win) |
1072 | return -ENOMEM; | |
1073 | ||
ba39bd83 | 1074 | win->msc = msc; |
bbbc08a1 | 1075 | win->sgt = &win->_sgt; |
615c164d AS |
1076 | win->lockout = WIN_READY; |
1077 | spin_lock_init(&win->lo_lock); | |
ba39bd83 | 1078 | |
ba82664c | 1079 | if (!list_empty(&msc->win_list)) { |
0de9e035 AS |
1080 | struct msc_window *prev = list_last_entry(&msc->win_list, |
1081 | struct msc_window, | |
1082 | entry); | |
ba82664c AS |
1083 | |
1084 | win->pgoff = prev->pgoff + prev->nr_blocks; | |
1085 | } | |
1086 | ||
615c164d AS |
1087 | if (msc->mbuf && msc->mbuf->alloc_window) |
1088 | ret = msc->mbuf->alloc_window(msc->mbuf_priv, &win->sgt, | |
1089 | nr_blocks << PAGE_SHIFT); | |
1090 | else | |
1091 | ret = __msc_buffer_win_alloc(win, nr_blocks); | |
1092 | ||
1093 | if (ret <= 0) | |
ba39bd83 | 1094 | goto err_nomem; |
ba82664c | 1095 | |
b96fb368 | 1096 | msc_buffer_set_uc(win, ret); |
ba82664c | 1097 | |
fa52b3fe AS |
1098 | win->nr_segs = ret; |
1099 | win->nr_blocks = nr_blocks; | |
ba82664c AS |
1100 | |
1101 | if (list_empty(&msc->win_list)) { | |
57b69a1f AS |
1102 | msc->base = msc_win_base(win); |
1103 | msc->base_addr = msc_win_base_dma(win); | |
aad14ad3 | 1104 | msc->cur_win = win; |
ba82664c AS |
1105 | } |
1106 | ||
1107 | list_add_tail(&win->entry, &msc->win_list); | |
1108 | msc->nr_pages += nr_blocks; | |
1109 | ||
1110 | return 0; | |
1111 | ||
1112 | err_nomem: | |
ba82664c AS |
1113 | kfree(win); |
1114 | ||
1115 | return ret; | |
1116 | } | |
1117 | ||
ba39bd83 AS |
1118 | static void __msc_buffer_win_free(struct msc *msc, struct msc_window *win) |
1119 | { | |
57b69a1f | 1120 | struct scatterlist *sg; |
ba39bd83 AS |
1121 | int i; |
1122 | ||
57b69a1f AS |
1123 | for_each_sg(win->sgt->sgl, sg, win->nr_segs, i) { |
1124 | struct page *page = sg_page(sg); | |
ba39bd83 AS |
1125 | |
1126 | page->mapping = NULL; | |
1127 | dma_free_coherent(msc_dev(win->msc)->parent->parent, PAGE_SIZE, | |
57b69a1f | 1128 | sg_virt(sg), sg_dma_address(sg)); |
ba39bd83 | 1129 | } |
bbbc08a1 | 1130 | sg_free_table(win->sgt); |
ba39bd83 AS |
1131 | } |
1132 | ||
ba82664c AS |
1133 | /** |
1134 | * msc_buffer_win_free() - free a window from MSC's window list | |
1135 | * @msc: MSC device | |
1136 | * @win: window to free | |
1137 | * | |
1138 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex | |
1139 | * to serialize, so the caller is expected to hold it. | |
1140 | */ | |
1141 | static void msc_buffer_win_free(struct msc *msc, struct msc_window *win) | |
1142 | { | |
ba82664c AS |
1143 | msc->nr_pages -= win->nr_blocks; |
1144 | ||
1145 | list_del(&win->entry); | |
1146 | if (list_empty(&msc->win_list)) { | |
1147 | msc->base = NULL; | |
1148 | msc->base_addr = 0; | |
1149 | } | |
1150 | ||
b96fb368 | 1151 | msc_buffer_set_wb(win); |
ba39bd83 | 1152 | |
615c164d AS |
1153 | if (msc->mbuf && msc->mbuf->free_window) |
1154 | msc->mbuf->free_window(msc->mbuf_priv, win->sgt); | |
1155 | else | |
1156 | __msc_buffer_win_free(msc, win); | |
ba82664c AS |
1157 | |
1158 | kfree(win); | |
1159 | } | |
1160 | ||
1161 | /** | |
1162 | * msc_buffer_relink() - set up block descriptors for multiblock mode | |
1163 | * @msc: MSC device | |
1164 | * | |
1165 | * This traverses msc::win_list, which requires msc::buf_mutex to serialize, | |
1166 | * so the caller is expected to hold it. | |
1167 | */ | |
1168 | static void msc_buffer_relink(struct msc *msc) | |
1169 | { | |
1170 | struct msc_window *win, *next_win; | |
1171 | ||
1172 | /* call with msc::mutex locked */ | |
1173 | list_for_each_entry(win, &msc->win_list, entry) { | |
57b69a1f | 1174 | struct scatterlist *sg; |
ba82664c AS |
1175 | unsigned int blk; |
1176 | u32 sw_tag = 0; | |
1177 | ||
1178 | /* | |
1179 | * Last window's next_win should point to the first window | |
1180 | * and MSC_SW_TAG_LASTWIN should be set. | |
1181 | */ | |
1182 | if (msc_is_last_win(win)) { | |
1183 | sw_tag |= MSC_SW_TAG_LASTWIN; | |
0de9e035 AS |
1184 | next_win = list_first_entry(&msc->win_list, |
1185 | struct msc_window, entry); | |
ba82664c | 1186 | } else { |
0de9e035 | 1187 | next_win = list_next_entry(win, entry); |
ba82664c AS |
1188 | } |
1189 | ||
57b69a1f AS |
1190 | for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
1191 | struct msc_block_desc *bdesc = sg_virt(sg); | |
ba82664c AS |
1192 | |
1193 | memset(bdesc, 0, sizeof(*bdesc)); | |
1194 | ||
57b69a1f | 1195 | bdesc->next_win = msc_win_base_pfn(next_win); |
ba82664c AS |
1196 | |
1197 | /* | |
1198 | * Similarly to last window, last block should point | |
1199 | * to the first one. | |
1200 | */ | |
fa52b3fe | 1201 | if (blk == win->nr_segs - 1) { |
ba82664c | 1202 | sw_tag |= MSC_SW_TAG_LASTBLK; |
57b69a1f | 1203 | bdesc->next_blk = msc_win_base_pfn(win); |
ba82664c | 1204 | } else { |
57b69a1f AS |
1205 | dma_addr_t addr = sg_dma_address(sg_next(sg)); |
1206 | ||
1207 | bdesc->next_blk = PFN_DOWN(addr); | |
ba82664c AS |
1208 | } |
1209 | ||
1210 | bdesc->sw_tag = sw_tag; | |
57b69a1f | 1211 | bdesc->block_sz = sg->length / 64; |
ba82664c AS |
1212 | } |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Make the above writes globally visible before tracing is | |
1217 | * enabled to make sure hardware sees them coherently. | |
1218 | */ | |
1219 | wmb(); | |
1220 | } | |
1221 | ||
1222 | static void msc_buffer_multi_free(struct msc *msc) | |
1223 | { | |
1224 | struct msc_window *win, *iter; | |
1225 | ||
1226 | list_for_each_entry_safe(win, iter, &msc->win_list, entry) | |
1227 | msc_buffer_win_free(msc, win); | |
1228 | } | |
1229 | ||
1230 | static int msc_buffer_multi_alloc(struct msc *msc, unsigned long *nr_pages, | |
1231 | unsigned int nr_wins) | |
1232 | { | |
1233 | int ret, i; | |
1234 | ||
1235 | for (i = 0; i < nr_wins; i++) { | |
1236 | ret = msc_buffer_win_alloc(msc, nr_pages[i]); | |
1237 | if (ret) { | |
1238 | msc_buffer_multi_free(msc); | |
1239 | return ret; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | msc_buffer_relink(msc); | |
1244 | ||
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | /** | |
1249 | * msc_buffer_free() - free buffers for MSC | |
1250 | * @msc: MSC device | |
1251 | * | |
1252 | * Free MSC's storage buffers. | |
1253 | * | |
1254 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex to | |
1255 | * serialize, so the caller is expected to hold it. | |
1256 | */ | |
1257 | static void msc_buffer_free(struct msc *msc) | |
1258 | { | |
1259 | if (msc->mode == MSC_MODE_SINGLE) | |
1260 | msc_buffer_contig_free(msc); | |
1261 | else if (msc->mode == MSC_MODE_MULTI) | |
1262 | msc_buffer_multi_free(msc); | |
1263 | } | |
1264 | ||
1265 | /** | |
1266 | * msc_buffer_alloc() - allocate a buffer for MSC | |
1267 | * @msc: MSC device | |
1268 | * @size: allocation size in bytes | |
1269 | * | |
1270 | * Allocate a storage buffer for MSC, depending on the msc::mode, it will be | |
1271 | * either done via msc_buffer_contig_alloc() for SINGLE operation mode or | |
1272 | * msc_buffer_win_alloc() for multiblock operation. The latter allocates one | |
1273 | * window per invocation, so in multiblock mode this can be called multiple | |
1274 | * times for the same MSC to allocate multiple windows. | |
1275 | * | |
1276 | * This modifies msc::win_list and msc::base, which requires msc::buf_mutex | |
1277 | * to serialize, so the caller is expected to hold it. | |
1278 | * | |
1279 | * Return: 0 on success, -errno otherwise. | |
1280 | */ | |
1281 | static int msc_buffer_alloc(struct msc *msc, unsigned long *nr_pages, | |
1282 | unsigned int nr_wins) | |
1283 | { | |
1284 | int ret; | |
1285 | ||
1286 | /* -1: buffer not allocated */ | |
1287 | if (atomic_read(&msc->user_count) != -1) | |
1288 | return -EBUSY; | |
1289 | ||
1290 | if (msc->mode == MSC_MODE_SINGLE) { | |
1291 | if (nr_wins != 1) | |
1292 | return -EINVAL; | |
1293 | ||
1294 | ret = msc_buffer_contig_alloc(msc, nr_pages[0] << PAGE_SHIFT); | |
1295 | } else if (msc->mode == MSC_MODE_MULTI) { | |
1296 | ret = msc_buffer_multi_alloc(msc, nr_pages, nr_wins); | |
1297 | } else { | |
ce666be8 | 1298 | ret = -EINVAL; |
ba82664c AS |
1299 | } |
1300 | ||
1301 | if (!ret) { | |
1302 | /* allocation should be visible before the counter goes to 0 */ | |
1303 | smp_mb__before_atomic(); | |
1304 | ||
1305 | if (WARN_ON_ONCE(atomic_cmpxchg(&msc->user_count, -1, 0) != -1)) | |
1306 | return -EINVAL; | |
1307 | } | |
1308 | ||
1309 | return ret; | |
1310 | } | |
1311 | ||
1312 | /** | |
1313 | * msc_buffer_unlocked_free_unless_used() - free a buffer unless it's in use | |
1314 | * @msc: MSC device | |
1315 | * | |
1316 | * This will free MSC buffer unless it is in use or there is no allocated | |
1317 | * buffer. | |
1318 | * Caller needs to hold msc::buf_mutex. | |
1319 | * | |
1320 | * Return: 0 on successful deallocation or if there was no buffer to | |
1321 | * deallocate, -EBUSY if there are active users. | |
1322 | */ | |
1323 | static int msc_buffer_unlocked_free_unless_used(struct msc *msc) | |
1324 | { | |
1325 | int count, ret = 0; | |
1326 | ||
1327 | count = atomic_cmpxchg(&msc->user_count, 0, -1); | |
1328 | ||
1329 | /* > 0: buffer is allocated and has users */ | |
1330 | if (count > 0) | |
1331 | ret = -EBUSY; | |
1332 | /* 0: buffer is allocated, no users */ | |
1333 | else if (!count) | |
1334 | msc_buffer_free(msc); | |
1335 | /* < 0: no buffer, nothing to do */ | |
1336 | ||
1337 | return ret; | |
1338 | } | |
1339 | ||
1340 | /** | |
1341 | * msc_buffer_free_unless_used() - free a buffer unless it's in use | |
1342 | * @msc: MSC device | |
1343 | * | |
1344 | * This is a locked version of msc_buffer_unlocked_free_unless_used(). | |
1345 | */ | |
1346 | static int msc_buffer_free_unless_used(struct msc *msc) | |
1347 | { | |
1348 | int ret; | |
1349 | ||
1350 | mutex_lock(&msc->buf_mutex); | |
1351 | ret = msc_buffer_unlocked_free_unless_used(msc); | |
1352 | mutex_unlock(&msc->buf_mutex); | |
1353 | ||
1354 | return ret; | |
1355 | } | |
1356 | ||
1357 | /** | |
1358 | * msc_buffer_get_page() - get MSC buffer page at a given offset | |
1359 | * @msc: MSC device | |
1360 | * @pgoff: page offset into the storage buffer | |
1361 | * | |
1362 | * This traverses msc::win_list, so holding msc::buf_mutex is expected from | |
1363 | * the caller. | |
1364 | * | |
1365 | * Return: page if @pgoff corresponds to a valid buffer page or NULL. | |
1366 | */ | |
1367 | static struct page *msc_buffer_get_page(struct msc *msc, unsigned long pgoff) | |
1368 | { | |
1369 | struct msc_window *win; | |
57b69a1f | 1370 | struct scatterlist *sg; |
fa52b3fe | 1371 | unsigned int blk; |
ba82664c AS |
1372 | |
1373 | if (msc->mode == MSC_MODE_SINGLE) | |
1374 | return msc_buffer_contig_get_page(msc, pgoff); | |
1375 | ||
1376 | list_for_each_entry(win, &msc->win_list, entry) | |
1377 | if (pgoff >= win->pgoff && pgoff < win->pgoff + win->nr_blocks) | |
1378 | goto found; | |
1379 | ||
1380 | return NULL; | |
1381 | ||
1382 | found: | |
1383 | pgoff -= win->pgoff; | |
fa52b3fe | 1384 | |
57b69a1f AS |
1385 | for_each_sg(win->sgt->sgl, sg, win->nr_segs, blk) { |
1386 | struct page *page = sg_page(sg); | |
1387 | size_t pgsz = PFN_DOWN(sg->length); | |
fa52b3fe AS |
1388 | |
1389 | if (pgoff < pgsz) | |
1390 | return page + pgoff; | |
1391 | ||
1392 | pgoff -= pgsz; | |
1393 | } | |
1394 | ||
1395 | return NULL; | |
ba82664c AS |
1396 | } |
1397 | ||
1398 | /** | |
1399 | * struct msc_win_to_user_struct - data for copy_to_user() callback | |
1400 | * @buf: userspace buffer to copy data to | |
1401 | * @offset: running offset | |
1402 | */ | |
1403 | struct msc_win_to_user_struct { | |
1404 | char __user *buf; | |
1405 | unsigned long offset; | |
1406 | }; | |
1407 | ||
1408 | /** | |
1409 | * msc_win_to_user() - iterator for msc_buffer_iterate() to copy data to user | |
1410 | * @data: callback's private data | |
1411 | * @src: source buffer | |
1412 | * @len: amount of data to copy from the source buffer | |
1413 | */ | |
1414 | static unsigned long msc_win_to_user(void *data, void *src, size_t len) | |
1415 | { | |
1416 | struct msc_win_to_user_struct *u = data; | |
1417 | unsigned long ret; | |
1418 | ||
1419 | ret = copy_to_user(u->buf + u->offset, src, len); | |
1420 | u->offset += len - ret; | |
1421 | ||
1422 | return ret; | |
1423 | } | |
1424 | ||
1425 | ||
1426 | /* | |
1427 | * file operations' callbacks | |
1428 | */ | |
1429 | ||
1430 | static int intel_th_msc_open(struct inode *inode, struct file *file) | |
1431 | { | |
1432 | struct intel_th_device *thdev = file->private_data; | |
1433 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
1434 | struct msc_iter *iter; | |
1435 | ||
1436 | if (!capable(CAP_SYS_RAWIO)) | |
1437 | return -EPERM; | |
1438 | ||
1439 | iter = msc_iter_install(msc); | |
a45ff6ed AS |
1440 | if (IS_ERR(iter)) |
1441 | return PTR_ERR(iter); | |
ba82664c AS |
1442 | |
1443 | file->private_data = iter; | |
1444 | ||
1445 | return nonseekable_open(inode, file); | |
1446 | } | |
1447 | ||
1448 | static int intel_th_msc_release(struct inode *inode, struct file *file) | |
1449 | { | |
1450 | struct msc_iter *iter = file->private_data; | |
1451 | struct msc *msc = iter->msc; | |
1452 | ||
1453 | msc_iter_remove(iter, msc); | |
1454 | ||
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | static ssize_t | |
1459 | msc_single_to_user(struct msc *msc, char __user *buf, loff_t off, size_t len) | |
1460 | { | |
ed392688 | 1461 | unsigned long size = msc->nr_pages << PAGE_SHIFT, rem = len; |
ba82664c AS |
1462 | unsigned long start = off, tocopy = 0; |
1463 | ||
1464 | if (msc->single_wrap) { | |
1465 | start += msc->single_sz; | |
1466 | if (start < size) { | |
1467 | tocopy = min(rem, size - start); | |
1468 | if (copy_to_user(buf, msc->base + start, tocopy)) | |
1469 | return -EFAULT; | |
1470 | ||
1471 | buf += tocopy; | |
1472 | rem -= tocopy; | |
1473 | start += tocopy; | |
1474 | } | |
1475 | ||
1476 | start &= size - 1; | |
1477 | if (rem) { | |
1478 | tocopy = min(rem, msc->single_sz - start); | |
1479 | if (copy_to_user(buf, msc->base + start, tocopy)) | |
1480 | return -EFAULT; | |
1481 | ||
1482 | rem -= tocopy; | |
1483 | } | |
1484 | ||
1485 | return len - rem; | |
1486 | } | |
1487 | ||
1488 | if (copy_to_user(buf, msc->base + start, rem)) | |
1489 | return -EFAULT; | |
1490 | ||
1491 | return len; | |
1492 | } | |
1493 | ||
1494 | static ssize_t intel_th_msc_read(struct file *file, char __user *buf, | |
1495 | size_t len, loff_t *ppos) | |
1496 | { | |
1497 | struct msc_iter *iter = file->private_data; | |
1498 | struct msc *msc = iter->msc; | |
1499 | size_t size; | |
1500 | loff_t off = *ppos; | |
1501 | ssize_t ret = 0; | |
1502 | ||
1503 | if (!atomic_inc_unless_negative(&msc->user_count)) | |
1504 | return 0; | |
1505 | ||
ba82664c AS |
1506 | if (msc->mode == MSC_MODE_SINGLE && !msc->single_wrap) |
1507 | size = msc->single_sz; | |
1508 | else | |
1509 | size = msc->nr_pages << PAGE_SHIFT; | |
1510 | ||
1511 | if (!size) | |
2bed074a | 1512 | goto put_count; |
ba82664c | 1513 | |
2bed074a | 1514 | if (off >= size) |
ba82664c | 1515 | goto put_count; |
2bed074a | 1516 | |
ba82664c AS |
1517 | if (off + len >= size) |
1518 | len = size - off; | |
1519 | ||
1520 | if (msc->mode == MSC_MODE_SINGLE) { | |
1521 | ret = msc_single_to_user(msc, buf, off, len); | |
1522 | if (ret >= 0) | |
1523 | *ppos += ret; | |
1524 | } else if (msc->mode == MSC_MODE_MULTI) { | |
1525 | struct msc_win_to_user_struct u = { | |
1526 | .buf = buf, | |
1527 | .offset = 0, | |
1528 | }; | |
1529 | ||
1530 | ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user); | |
1531 | if (ret >= 0) | |
1532 | *ppos = iter->offset; | |
1533 | } else { | |
ce666be8 | 1534 | ret = -EINVAL; |
ba82664c AS |
1535 | } |
1536 | ||
1537 | put_count: | |
1538 | atomic_dec(&msc->user_count); | |
1539 | ||
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * vm operations callbacks (vm_ops) | |
1545 | */ | |
1546 | ||
1547 | static void msc_mmap_open(struct vm_area_struct *vma) | |
1548 | { | |
1549 | struct msc_iter *iter = vma->vm_file->private_data; | |
1550 | struct msc *msc = iter->msc; | |
1551 | ||
1552 | atomic_inc(&msc->mmap_count); | |
1553 | } | |
1554 | ||
1555 | static void msc_mmap_close(struct vm_area_struct *vma) | |
1556 | { | |
1557 | struct msc_iter *iter = vma->vm_file->private_data; | |
1558 | struct msc *msc = iter->msc; | |
1559 | unsigned long pg; | |
1560 | ||
1561 | if (!atomic_dec_and_mutex_lock(&msc->mmap_count, &msc->buf_mutex)) | |
1562 | return; | |
1563 | ||
0139aa7b | 1564 | /* drop page _refcounts */ |
ba82664c AS |
1565 | for (pg = 0; pg < msc->nr_pages; pg++) { |
1566 | struct page *page = msc_buffer_get_page(msc, pg); | |
1567 | ||
1568 | if (WARN_ON_ONCE(!page)) | |
1569 | continue; | |
1570 | ||
1571 | if (page->mapping) | |
1572 | page->mapping = NULL; | |
1573 | } | |
1574 | ||
1575 | /* last mapping -- drop user_count */ | |
1576 | atomic_dec(&msc->user_count); | |
1577 | mutex_unlock(&msc->buf_mutex); | |
1578 | } | |
1579 | ||
42df0509 | 1580 | static vm_fault_t msc_mmap_fault(struct vm_fault *vmf) |
ba82664c | 1581 | { |
11bac800 | 1582 | struct msc_iter *iter = vmf->vma->vm_file->private_data; |
ba82664c AS |
1583 | struct msc *msc = iter->msc; |
1584 | ||
1585 | vmf->page = msc_buffer_get_page(msc, vmf->pgoff); | |
1586 | if (!vmf->page) | |
1587 | return VM_FAULT_SIGBUS; | |
1588 | ||
1589 | get_page(vmf->page); | |
11bac800 | 1590 | vmf->page->mapping = vmf->vma->vm_file->f_mapping; |
ba82664c AS |
1591 | vmf->page->index = vmf->pgoff; |
1592 | ||
1593 | return 0; | |
1594 | } | |
1595 | ||
1596 | static const struct vm_operations_struct msc_mmap_ops = { | |
1597 | .open = msc_mmap_open, | |
1598 | .close = msc_mmap_close, | |
1599 | .fault = msc_mmap_fault, | |
1600 | }; | |
1601 | ||
1602 | static int intel_th_msc_mmap(struct file *file, struct vm_area_struct *vma) | |
1603 | { | |
1604 | unsigned long size = vma->vm_end - vma->vm_start; | |
1605 | struct msc_iter *iter = vma->vm_file->private_data; | |
1606 | struct msc *msc = iter->msc; | |
1607 | int ret = -EINVAL; | |
1608 | ||
1609 | if (!size || offset_in_page(size)) | |
1610 | return -EINVAL; | |
1611 | ||
1612 | if (vma->vm_pgoff) | |
1613 | return -EINVAL; | |
1614 | ||
1615 | /* grab user_count once per mmap; drop in msc_mmap_close() */ | |
1616 | if (!atomic_inc_unless_negative(&msc->user_count)) | |
1617 | return -EINVAL; | |
1618 | ||
1619 | if (msc->mode != MSC_MODE_SINGLE && | |
1620 | msc->mode != MSC_MODE_MULTI) | |
1621 | goto out; | |
1622 | ||
1623 | if (size >> PAGE_SHIFT != msc->nr_pages) | |
1624 | goto out; | |
1625 | ||
1626 | atomic_set(&msc->mmap_count, 1); | |
1627 | ret = 0; | |
1628 | ||
1629 | out: | |
1630 | if (ret) | |
1631 | atomic_dec(&msc->user_count); | |
1632 | ||
1633 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1634 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTCOPY; | |
1635 | vma->vm_ops = &msc_mmap_ops; | |
1636 | return ret; | |
1637 | } | |
1638 | ||
1639 | static const struct file_operations intel_th_msc_fops = { | |
1640 | .open = intel_th_msc_open, | |
1641 | .release = intel_th_msc_release, | |
1642 | .read = intel_th_msc_read, | |
1643 | .mmap = intel_th_msc_mmap, | |
1644 | .llseek = no_llseek, | |
8e9a2beb | 1645 | .owner = THIS_MODULE, |
ba82664c AS |
1646 | }; |
1647 | ||
8d415512 AS |
1648 | static void intel_th_msc_wait_empty(struct intel_th_device *thdev) |
1649 | { | |
1650 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
1651 | unsigned long count; | |
1652 | u32 reg; | |
1653 | ||
1654 | for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH; | |
1655 | count && !(reg & MSCSTS_PLE); count--) { | |
1656 | reg = __raw_readl(msc->reg_base + REG_MSU_MSC0STS); | |
1657 | cpu_relax(); | |
1658 | } | |
1659 | ||
1660 | if (!count) | |
1661 | dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n"); | |
1662 | } | |
1663 | ||
ba82664c AS |
1664 | static int intel_th_msc_init(struct msc *msc) |
1665 | { | |
1666 | atomic_set(&msc->user_count, -1); | |
1667 | ||
1668 | msc->mode = MSC_MODE_MULTI; | |
1669 | mutex_init(&msc->buf_mutex); | |
1670 | INIT_LIST_HEAD(&msc->win_list); | |
ba82664c AS |
1671 | INIT_LIST_HEAD(&msc->iter_list); |
1672 | ||
1673 | msc->burst_len = | |
1674 | (ioread32(msc->reg_base + REG_MSU_MSC0CTL) & MSC_LEN) >> | |
1675 | __ffs(MSC_LEN); | |
1676 | ||
1677 | return 0; | |
1678 | } | |
1679 | ||
05b686b5 | 1680 | static int msc_win_switch(struct msc *msc) |
aad14ad3 | 1681 | { |
9800db28 | 1682 | struct msc_window *first; |
aad14ad3 | 1683 | |
05b686b5 AS |
1684 | if (list_empty(&msc->win_list)) |
1685 | return -EINVAL; | |
1686 | ||
aad14ad3 | 1687 | first = list_first_entry(&msc->win_list, struct msc_window, entry); |
aad14ad3 AS |
1688 | |
1689 | if (msc_is_last_win(msc->cur_win)) | |
1690 | msc->cur_win = first; | |
1691 | else | |
1692 | msc->cur_win = list_next_entry(msc->cur_win, entry); | |
1693 | ||
57b69a1f AS |
1694 | msc->base = msc_win_base(msc->cur_win); |
1695 | msc->base_addr = msc_win_base_dma(msc->cur_win); | |
aad14ad3 AS |
1696 | |
1697 | intel_th_trace_switch(msc->thdev); | |
05b686b5 AS |
1698 | |
1699 | return 0; | |
aad14ad3 AS |
1700 | } |
1701 | ||
615c164d AS |
1702 | /** |
1703 | * intel_th_msc_window_unlock - put the window back in rotation | |
1704 | * @dev: MSC device to which this relates | |
1705 | * @sgt: buffer's sg_table for the window, does nothing if NULL | |
1706 | */ | |
1707 | void intel_th_msc_window_unlock(struct device *dev, struct sg_table *sgt) | |
1708 | { | |
1709 | struct msc *msc = dev_get_drvdata(dev); | |
1710 | struct msc_window *win; | |
1711 | ||
1712 | if (!sgt) | |
1713 | return; | |
1714 | ||
1715 | win = msc_find_window(msc, sgt, false); | |
1716 | if (!win) | |
1717 | return; | |
1718 | ||
1719 | msc_win_set_lockout(win, WIN_LOCKED, WIN_READY); | |
1720 | } | |
1721 | EXPORT_SYMBOL_GPL(intel_th_msc_window_unlock); | |
1722 | ||
1723 | static void msc_work(struct work_struct *work) | |
1724 | { | |
1725 | struct msc *msc = container_of(work, struct msc, work); | |
1726 | ||
1727 | intel_th_msc_deactivate(msc->thdev); | |
1728 | } | |
1729 | ||
aac8da65 AS |
1730 | static irqreturn_t intel_th_msc_interrupt(struct intel_th_device *thdev) |
1731 | { | |
1732 | struct msc *msc = dev_get_drvdata(&thdev->dev); | |
1733 | u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS); | |
1734 | u32 mask = msc->index ? MSUSTS_MSC1BLAST : MSUSTS_MSC0BLAST; | |
615c164d | 1735 | struct msc_window *win, *next_win; |
aac8da65 | 1736 | |
615c164d | 1737 | if (!msc->do_irq || !msc->mbuf) |
aac8da65 | 1738 | return IRQ_NONE; |
615c164d AS |
1739 | |
1740 | msusts &= mask; | |
1741 | ||
1742 | if (!msusts) | |
1743 | return msc->enabled ? IRQ_HANDLED : IRQ_NONE; | |
1744 | ||
1745 | iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS); | |
1746 | ||
1747 | if (!msc->enabled) | |
1748 | return IRQ_NONE; | |
1749 | ||
1750 | /* grab the window before we do the switch */ | |
1751 | win = msc->cur_win; | |
1752 | if (!win) | |
1753 | return IRQ_HANDLED; | |
1754 | next_win = msc_next_window(win); | |
1755 | if (!next_win) | |
1756 | return IRQ_HANDLED; | |
1757 | ||
1758 | /* next window: if READY, proceed, if LOCKED, stop the trace */ | |
1759 | if (msc_win_set_lockout(next_win, WIN_READY, WIN_INUSE)) { | |
1760 | schedule_work(&msc->work); | |
1761 | return IRQ_HANDLED; | |
aac8da65 AS |
1762 | } |
1763 | ||
615c164d AS |
1764 | /* current window: INUSE -> LOCKED */ |
1765 | msc_win_set_lockout(win, WIN_INUSE, WIN_LOCKED); | |
1766 | ||
1767 | msc_win_switch(msc); | |
1768 | ||
1769 | if (msc->mbuf && msc->mbuf->ready) | |
1770 | msc->mbuf->ready(msc->mbuf_priv, win->sgt, | |
1771 | msc_win_total_sz(win)); | |
1772 | ||
aac8da65 AS |
1773 | return IRQ_HANDLED; |
1774 | } | |
1775 | ||
ba82664c AS |
1776 | static const char * const msc_mode[] = { |
1777 | [MSC_MODE_SINGLE] = "single", | |
1778 | [MSC_MODE_MULTI] = "multi", | |
1779 | [MSC_MODE_EXI] = "ExI", | |
1780 | [MSC_MODE_DEBUG] = "debug", | |
1781 | }; | |
1782 | ||
1783 | static ssize_t | |
1784 | wrap_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1785 | { | |
1786 | struct msc *msc = dev_get_drvdata(dev); | |
1787 | ||
1788 | return scnprintf(buf, PAGE_SIZE, "%d\n", msc->wrap); | |
1789 | } | |
1790 | ||
1791 | static ssize_t | |
1792 | wrap_store(struct device *dev, struct device_attribute *attr, const char *buf, | |
1793 | size_t size) | |
1794 | { | |
1795 | struct msc *msc = dev_get_drvdata(dev); | |
1796 | unsigned long val; | |
1797 | int ret; | |
1798 | ||
1799 | ret = kstrtoul(buf, 10, &val); | |
1800 | if (ret) | |
1801 | return ret; | |
1802 | ||
1803 | msc->wrap = !!val; | |
1804 | ||
1805 | return size; | |
1806 | } | |
1807 | ||
1808 | static DEVICE_ATTR_RW(wrap); | |
1809 | ||
615c164d AS |
1810 | static void msc_buffer_unassign(struct msc *msc) |
1811 | { | |
1812 | lockdep_assert_held(&msc->buf_mutex); | |
1813 | ||
1814 | if (!msc->mbuf) | |
1815 | return; | |
1816 | ||
1817 | msc->mbuf->unassign(msc->mbuf_priv); | |
1818 | msu_buffer_put(msc->mbuf); | |
1819 | msc->mbuf_priv = NULL; | |
1820 | msc->mbuf = NULL; | |
1821 | } | |
1822 | ||
ba82664c AS |
1823 | static ssize_t |
1824 | mode_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1825 | { | |
1826 | struct msc *msc = dev_get_drvdata(dev); | |
615c164d AS |
1827 | const char *mode = msc_mode[msc->mode]; |
1828 | ssize_t ret; | |
1829 | ||
1830 | mutex_lock(&msc->buf_mutex); | |
1831 | if (msc->mbuf) | |
1832 | mode = msc->mbuf->name; | |
1833 | ret = scnprintf(buf, PAGE_SIZE, "%s\n", mode); | |
1834 | mutex_unlock(&msc->buf_mutex); | |
ba82664c | 1835 | |
615c164d | 1836 | return ret; |
ba82664c AS |
1837 | } |
1838 | ||
1839 | static ssize_t | |
1840 | mode_store(struct device *dev, struct device_attribute *attr, const char *buf, | |
1841 | size_t size) | |
1842 | { | |
615c164d | 1843 | const struct msu_buffer *mbuf = NULL; |
ba82664c AS |
1844 | struct msc *msc = dev_get_drvdata(dev); |
1845 | size_t len = size; | |
615c164d | 1846 | char *cp, *mode; |
ba82664c AS |
1847 | int i, ret; |
1848 | ||
1849 | if (!capable(CAP_SYS_RAWIO)) | |
1850 | return -EPERM; | |
1851 | ||
1852 | cp = memchr(buf, '\n', len); | |
1853 | if (cp) | |
1854 | len = cp - buf; | |
1855 | ||
615c164d | 1856 | mode = kstrndup(buf, len, GFP_KERNEL); |
063f097f CIK |
1857 | if (!mode) |
1858 | return -ENOMEM; | |
1859 | ||
615c164d | 1860 | i = match_string(msc_mode, ARRAY_SIZE(msc_mode), mode); |
1fa1b6ca WY |
1861 | if (i >= 0) { |
1862 | kfree(mode); | |
615c164d | 1863 | goto found; |
1fa1b6ca | 1864 | } |
615c164d AS |
1865 | |
1866 | /* Buffer sinks only work with a usable IRQ */ | |
1867 | if (!msc->do_irq) { | |
1868 | kfree(mode); | |
1869 | return -EINVAL; | |
1870 | } | |
1871 | ||
1872 | mbuf = msu_buffer_get(mode); | |
1873 | kfree(mode); | |
1874 | if (mbuf) | |
1875 | goto found; | |
ba82664c AS |
1876 | |
1877 | return -EINVAL; | |
1878 | ||
1879 | found: | |
1880 | mutex_lock(&msc->buf_mutex); | |
615c164d AS |
1881 | ret = 0; |
1882 | ||
1883 | /* Same buffer: do nothing */ | |
1884 | if (mbuf && mbuf == msc->mbuf) { | |
1885 | /* put the extra reference we just got */ | |
1886 | msu_buffer_put(mbuf); | |
1887 | goto unlock; | |
1888 | } | |
1889 | ||
ba82664c | 1890 | ret = msc_buffer_unlocked_free_unless_used(msc); |
615c164d AS |
1891 | if (ret) |
1892 | goto unlock; | |
1893 | ||
1894 | if (mbuf) { | |
1895 | void *mbuf_priv = mbuf->assign(dev, &i); | |
1896 | ||
1897 | if (!mbuf_priv) { | |
1898 | ret = -ENOMEM; | |
1899 | goto unlock; | |
1900 | } | |
1901 | ||
1902 | msc_buffer_unassign(msc); | |
1903 | msc->mbuf_priv = mbuf_priv; | |
1904 | msc->mbuf = mbuf; | |
1905 | } else { | |
1906 | msc_buffer_unassign(msc); | |
1907 | } | |
1908 | ||
1909 | msc->mode = i; | |
1910 | ||
1911 | unlock: | |
1912 | if (ret && mbuf) | |
1913 | msu_buffer_put(mbuf); | |
ba82664c AS |
1914 | mutex_unlock(&msc->buf_mutex); |
1915 | ||
1916 | return ret ? ret : size; | |
1917 | } | |
1918 | ||
1919 | static DEVICE_ATTR_RW(mode); | |
1920 | ||
1921 | static ssize_t | |
1922 | nr_pages_show(struct device *dev, struct device_attribute *attr, char *buf) | |
1923 | { | |
1924 | struct msc *msc = dev_get_drvdata(dev); | |
1925 | struct msc_window *win; | |
1926 | size_t count = 0; | |
1927 | ||
1928 | mutex_lock(&msc->buf_mutex); | |
1929 | ||
1930 | if (msc->mode == MSC_MODE_SINGLE) | |
1931 | count = scnprintf(buf, PAGE_SIZE, "%ld\n", msc->nr_pages); | |
1932 | else if (msc->mode == MSC_MODE_MULTI) { | |
1933 | list_for_each_entry(win, &msc->win_list, entry) { | |
1934 | count += scnprintf(buf + count, PAGE_SIZE - count, | |
1935 | "%d%c", win->nr_blocks, | |
1936 | msc_is_last_win(win) ? '\n' : ','); | |
1937 | } | |
1938 | } else { | |
1939 | count = scnprintf(buf, PAGE_SIZE, "unsupported\n"); | |
1940 | } | |
1941 | ||
1942 | mutex_unlock(&msc->buf_mutex); | |
1943 | ||
1944 | return count; | |
1945 | } | |
1946 | ||
1947 | static ssize_t | |
1948 | nr_pages_store(struct device *dev, struct device_attribute *attr, | |
1949 | const char *buf, size_t size) | |
1950 | { | |
1951 | struct msc *msc = dev_get_drvdata(dev); | |
1952 | unsigned long val, *win = NULL, *rewin; | |
1953 | size_t len = size; | |
1954 | const char *p = buf; | |
1955 | char *end, *s; | |
1956 | int ret, nr_wins = 0; | |
1957 | ||
1958 | if (!capable(CAP_SYS_RAWIO)) | |
1959 | return -EPERM; | |
1960 | ||
1961 | ret = msc_buffer_free_unless_used(msc); | |
1962 | if (ret) | |
1963 | return ret; | |
1964 | ||
1965 | /* scan the comma-separated list of allocation sizes */ | |
1966 | end = memchr(buf, '\n', len); | |
1967 | if (end) | |
1968 | len = end - buf; | |
1969 | ||
1970 | do { | |
1971 | end = memchr(p, ',', len); | |
1972 | s = kstrndup(p, end ? end - p : len, GFP_KERNEL); | |
6575cbd6 AS |
1973 | if (!s) { |
1974 | ret = -ENOMEM; | |
1975 | goto free_win; | |
1976 | } | |
1977 | ||
ba82664c AS |
1978 | ret = kstrtoul(s, 10, &val); |
1979 | kfree(s); | |
1980 | ||
1981 | if (ret || !val) | |
1982 | goto free_win; | |
1983 | ||
1984 | if (nr_wins && msc->mode == MSC_MODE_SINGLE) { | |
1985 | ret = -EINVAL; | |
1986 | goto free_win; | |
1987 | } | |
1988 | ||
1989 | nr_wins++; | |
1990 | rewin = krealloc(win, sizeof(*win) * nr_wins, GFP_KERNEL); | |
1991 | if (!rewin) { | |
1992 | kfree(win); | |
1993 | return -ENOMEM; | |
1994 | } | |
1995 | ||
1996 | win = rewin; | |
1997 | win[nr_wins - 1] = val; | |
1998 | ||
1999 | if (!end) | |
2000 | break; | |
2001 | ||
ec5b5ad6 AS |
2002 | /* consume the number and the following comma, hence +1 */ |
2003 | len -= end - p + 1; | |
ba82664c AS |
2004 | p = end + 1; |
2005 | } while (len); | |
2006 | ||
2007 | mutex_lock(&msc->buf_mutex); | |
2008 | ret = msc_buffer_alloc(msc, win, nr_wins); | |
2009 | mutex_unlock(&msc->buf_mutex); | |
2010 | ||
2011 | free_win: | |
2012 | kfree(win); | |
2013 | ||
2014 | return ret ? ret : size; | |
2015 | } | |
2016 | ||
2017 | static DEVICE_ATTR_RW(nr_pages); | |
2018 | ||
6cac7866 AS |
2019 | static ssize_t |
2020 | win_switch_store(struct device *dev, struct device_attribute *attr, | |
2021 | const char *buf, size_t size) | |
2022 | { | |
2023 | struct msc *msc = dev_get_drvdata(dev); | |
2024 | unsigned long val; | |
2025 | int ret; | |
2026 | ||
2027 | ret = kstrtoul(buf, 10, &val); | |
2028 | if (ret) | |
2029 | return ret; | |
2030 | ||
2031 | if (val != 1) | |
2032 | return -EINVAL; | |
2033 | ||
05b686b5 | 2034 | ret = -EINVAL; |
6cac7866 | 2035 | mutex_lock(&msc->buf_mutex); |
615c164d AS |
2036 | /* |
2037 | * Window switch can only happen in the "multi" mode. | |
2038 | * If a external buffer is engaged, they have the full | |
2039 | * control over window switching. | |
2040 | */ | |
05b686b5 AS |
2041 | if (msc->mode == MSC_MODE_MULTI && !msc->mbuf) |
2042 | ret = msc_win_switch(msc); | |
6cac7866 AS |
2043 | mutex_unlock(&msc->buf_mutex); |
2044 | ||
2045 | return ret ? ret : size; | |
2046 | } | |
2047 | ||
2048 | static DEVICE_ATTR_WO(win_switch); | |
2049 | ||
ba82664c AS |
2050 | static struct attribute *msc_output_attrs[] = { |
2051 | &dev_attr_wrap.attr, | |
2052 | &dev_attr_mode.attr, | |
2053 | &dev_attr_nr_pages.attr, | |
6cac7866 | 2054 | &dev_attr_win_switch.attr, |
ba82664c AS |
2055 | NULL, |
2056 | }; | |
2057 | ||
2058 | static struct attribute_group msc_output_group = { | |
2059 | .attrs = msc_output_attrs, | |
2060 | }; | |
2061 | ||
2062 | static int intel_th_msc_probe(struct intel_th_device *thdev) | |
2063 | { | |
2064 | struct device *dev = &thdev->dev; | |
2065 | struct resource *res; | |
2066 | struct msc *msc; | |
2067 | void __iomem *base; | |
2068 | int err; | |
2069 | ||
2070 | res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0); | |
2071 | if (!res) | |
2072 | return -ENODEV; | |
2073 | ||
2074 | base = devm_ioremap(dev, res->start, resource_size(res)); | |
73061da0 DC |
2075 | if (!base) |
2076 | return -ENOMEM; | |
ba82664c AS |
2077 | |
2078 | msc = devm_kzalloc(dev, sizeof(*msc), GFP_KERNEL); | |
2079 | if (!msc) | |
2080 | return -ENOMEM; | |
2081 | ||
aac8da65 AS |
2082 | res = intel_th_device_get_resource(thdev, IORESOURCE_IRQ, 1); |
2083 | if (!res) | |
2084 | msc->do_irq = 1; | |
2085 | ||
ba82664c AS |
2086 | msc->index = thdev->id; |
2087 | ||
2088 | msc->thdev = thdev; | |
2089 | msc->reg_base = base + msc->index * 0x100; | |
aac8da65 AS |
2090 | msc->msu_base = base; |
2091 | ||
615c164d | 2092 | INIT_WORK(&msc->work, msc_work); |
ba82664c AS |
2093 | err = intel_th_msc_init(msc); |
2094 | if (err) | |
2095 | return err; | |
2096 | ||
ba82664c AS |
2097 | dev_set_drvdata(dev, msc); |
2098 | ||
2099 | return 0; | |
2100 | } | |
2101 | ||
2102 | static void intel_th_msc_remove(struct intel_th_device *thdev) | |
2103 | { | |
f152dfee AS |
2104 | struct msc *msc = dev_get_drvdata(&thdev->dev); |
2105 | int ret; | |
2106 | ||
2107 | intel_th_msc_deactivate(thdev); | |
2108 | ||
2109 | /* | |
2110 | * Buffers should not be used at this point except if the | |
2111 | * output character device is still open and the parent | |
2112 | * device gets detached from its bus, which is a FIXME. | |
2113 | */ | |
2114 | ret = msc_buffer_free_unless_used(msc); | |
2115 | WARN_ON_ONCE(ret); | |
ba82664c AS |
2116 | } |
2117 | ||
2118 | static struct intel_th_driver intel_th_msc_driver = { | |
2119 | .probe = intel_th_msc_probe, | |
2120 | .remove = intel_th_msc_remove, | |
aac8da65 | 2121 | .irq = intel_th_msc_interrupt, |
8d415512 | 2122 | .wait_empty = intel_th_msc_wait_empty, |
ba82664c AS |
2123 | .activate = intel_th_msc_activate, |
2124 | .deactivate = intel_th_msc_deactivate, | |
2125 | .fops = &intel_th_msc_fops, | |
9d482aed | 2126 | .attr_group = &msc_output_group, |
ba82664c AS |
2127 | .driver = { |
2128 | .name = "msc", | |
2129 | .owner = THIS_MODULE, | |
2130 | }, | |
2131 | }; | |
2132 | ||
2133 | module_driver(intel_th_msc_driver, | |
2134 | intel_th_driver_register, | |
2135 | intel_th_driver_unregister); | |
2136 | ||
2137 | MODULE_LICENSE("GPL v2"); | |
2138 | MODULE_DESCRIPTION("Intel(R) Trace Hub Memory Storage Unit driver"); | |
2139 | MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); |