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ad0dfdfd | 1 | // SPDX-License-Identifier: GPL-2.0 |
6c6ed1e2 MP |
2 | /* |
3 | * Copyright(C) 2016 Linaro Limited. All rights reserved. | |
4 | * Author: Mathieu Poirier <mathieu.poirier@linaro.org> | |
6c6ed1e2 MP |
5 | */ |
6 | ||
f973d88b | 7 | #include <linux/atomic.h> |
2e499bbc | 8 | #include <linux/circ_buf.h> |
6c6ed1e2 | 9 | #include <linux/coresight.h> |
2e499bbc | 10 | #include <linux/perf_event.h> |
de546197 | 11 | #include <linux/slab.h> |
6c6ed1e2 MP |
12 | #include "coresight-priv.h" |
13 | #include "coresight-tmc.h" | |
3d6e8935 SP |
14 | #include "coresight-etm-perf.h" |
15 | ||
16 | static int tmc_set_etf_buffer(struct coresight_device *csdev, | |
17 | struct perf_output_handle *handle); | |
6c6ed1e2 | 18 | |
1d364034 | 19 | static void __tmc_etb_enable_hw(struct tmc_drvdata *drvdata) |
6c6ed1e2 | 20 | { |
6c6ed1e2 MP |
21 | CS_UNLOCK(drvdata->base); |
22 | ||
23 | /* Wait for TMCSReady bit to be set */ | |
24 | tmc_wait_for_tmcready(drvdata); | |
25 | ||
26 | writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE); | |
27 | writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI | | |
28 | TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT | | |
29 | TMC_FFCR_TRIGON_TRIGIN, | |
30 | drvdata->base + TMC_FFCR); | |
31 | ||
32 | writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG); | |
33 | tmc_enable_hw(drvdata); | |
34 | ||
35 | CS_LOCK(drvdata->base); | |
36 | } | |
37 | ||
1d364034 SP |
38 | static int tmc_etb_enable_hw(struct tmc_drvdata *drvdata) |
39 | { | |
4d3ebd36 SP |
40 | int rc = coresight_claim_device(drvdata->base); |
41 | ||
42 | if (rc) | |
43 | return rc; | |
44 | ||
1d364034 SP |
45 | __tmc_etb_enable_hw(drvdata); |
46 | return 0; | |
47 | } | |
48 | ||
6c6ed1e2 MP |
49 | static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata) |
50 | { | |
6c6ed1e2 | 51 | char *bufp; |
6f755e85 | 52 | u32 read_data, lost; |
6c6ed1e2 | 53 | |
6f755e85 SP |
54 | /* Check if the buffer wrapped around. */ |
55 | lost = readl_relaxed(drvdata->base + TMC_STS) & TMC_STS_FULL; | |
6c6ed1e2 | 56 | bufp = drvdata->buf; |
8505feae | 57 | drvdata->len = 0; |
6c6ed1e2 | 58 | while (1) { |
b3bee19e LY |
59 | read_data = readl_relaxed(drvdata->base + TMC_RRD); |
60 | if (read_data == 0xFFFFFFFF) | |
61 | break; | |
62 | memcpy(bufp, &read_data, 4); | |
63 | bufp += 4; | |
64 | drvdata->len += 4; | |
6c6ed1e2 | 65 | } |
b3bee19e | 66 | |
6f755e85 SP |
67 | if (lost) |
68 | coresight_insert_barrier_packet(drvdata->buf); | |
69 | return; | |
6c6ed1e2 MP |
70 | } |
71 | ||
4d3ebd36 | 72 | static void __tmc_etb_disable_hw(struct tmc_drvdata *drvdata) |
6c6ed1e2 MP |
73 | { |
74 | CS_UNLOCK(drvdata->base); | |
75 | ||
76 | tmc_flush_and_stop(drvdata); | |
a40318fb MP |
77 | /* |
78 | * When operating in sysFS mode the content of the buffer needs to be | |
79 | * read before the TMC is disabled. | |
80 | */ | |
297ab90f | 81 | if (drvdata->mode == CS_MODE_SYSFS) |
a40318fb | 82 | tmc_etb_dump_hw(drvdata); |
6c6ed1e2 MP |
83 | tmc_disable_hw(drvdata); |
84 | ||
85 | CS_LOCK(drvdata->base); | |
86 | } | |
87 | ||
4d3ebd36 SP |
88 | static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) |
89 | { | |
4d3ebd36 | 90 | __tmc_etb_disable_hw(drvdata); |
32c58c4d | 91 | coresight_disclaim_device(drvdata->base); |
4d3ebd36 SP |
92 | } |
93 | ||
1d364034 | 94 | static void __tmc_etf_enable_hw(struct tmc_drvdata *drvdata) |
6c6ed1e2 MP |
95 | { |
96 | CS_UNLOCK(drvdata->base); | |
97 | ||
98 | /* Wait for TMCSReady bit to be set */ | |
99 | tmc_wait_for_tmcready(drvdata); | |
100 | ||
101 | writel_relaxed(TMC_MODE_HARDWARE_FIFO, drvdata->base + TMC_MODE); | |
102 | writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI, | |
103 | drvdata->base + TMC_FFCR); | |
104 | writel_relaxed(0x0, drvdata->base + TMC_BUFWM); | |
105 | tmc_enable_hw(drvdata); | |
106 | ||
107 | CS_LOCK(drvdata->base); | |
108 | } | |
109 | ||
1d364034 SP |
110 | static int tmc_etf_enable_hw(struct tmc_drvdata *drvdata) |
111 | { | |
4d3ebd36 SP |
112 | int rc = coresight_claim_device(drvdata->base); |
113 | ||
114 | if (rc) | |
115 | return rc; | |
116 | ||
1d364034 SP |
117 | __tmc_etf_enable_hw(drvdata); |
118 | return 0; | |
119 | } | |
120 | ||
6c6ed1e2 MP |
121 | static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata) |
122 | { | |
123 | CS_UNLOCK(drvdata->base); | |
124 | ||
125 | tmc_flush_and_stop(drvdata); | |
126 | tmc_disable_hw(drvdata); | |
4d3ebd36 | 127 | coresight_disclaim_device_unlocked(drvdata->base); |
6c6ed1e2 MP |
128 | CS_LOCK(drvdata->base); |
129 | } | |
130 | ||
3495722a SP |
131 | /* |
132 | * Return the available trace data in the buffer from @pos, with | |
133 | * a maximum limit of @len, updating the @bufpp on where to | |
134 | * find it. | |
135 | */ | |
136 | ssize_t tmc_etb_get_sysfs_trace(struct tmc_drvdata *drvdata, | |
137 | loff_t pos, size_t len, char **bufpp) | |
138 | { | |
139 | ssize_t actual = len; | |
140 | ||
141 | /* Adjust the len to available size @pos */ | |
142 | if (pos + actual > drvdata->len) | |
143 | actual = drvdata->len - pos; | |
144 | if (actual > 0) | |
145 | *bufpp = drvdata->buf + pos; | |
146 | return actual; | |
147 | } | |
148 | ||
c38e505e | 149 | static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev) |
6c6ed1e2 | 150 | { |
de546197 MP |
151 | int ret = 0; |
152 | bool used = false; | |
153 | char *buf = NULL; | |
6c6ed1e2 MP |
154 | unsigned long flags; |
155 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
156 | ||
de546197 MP |
157 | /* |
158 | * If we don't have a buffer release the lock and allocate memory. | |
159 | * Otherwise keep the lock and move along. | |
160 | */ | |
6c6ed1e2 | 161 | spin_lock_irqsave(&drvdata->spinlock, flags); |
de546197 | 162 | if (!drvdata->buf) { |
6c6ed1e2 | 163 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
de546197 MP |
164 | |
165 | /* Allocating the memory here while outside of the spinlock */ | |
166 | buf = kzalloc(drvdata->size, GFP_KERNEL); | |
167 | if (!buf) | |
168 | return -ENOMEM; | |
169 | ||
170 | /* Let's try again */ | |
171 | spin_lock_irqsave(&drvdata->spinlock, flags); | |
172 | } | |
173 | ||
174 | if (drvdata->reading) { | |
175 | ret = -EBUSY; | |
176 | goto out; | |
177 | } | |
178 | ||
f2facc33 MP |
179 | /* |
180 | * In sysFS mode we can have multiple writers per sink. Since this | |
181 | * sink is already enabled no memory is needed and the HW need not be | |
182 | * touched. | |
183 | */ | |
f973d88b MP |
184 | if (drvdata->mode == CS_MODE_SYSFS) { |
185 | atomic_inc(csdev->refcnt); | |
f2facc33 | 186 | goto out; |
f973d88b | 187 | } |
f2facc33 | 188 | |
de546197 MP |
189 | /* |
190 | * If drvdata::buf isn't NULL, memory was allocated for a previous | |
191 | * trace run but wasn't read. If so simply zero-out the memory. | |
192 | * Otherwise use the memory allocated above. | |
193 | * | |
194 | * The memory is freed when users read the buffer using the | |
195 | * /dev/xyz.{etf|etb} interface. See tmc_read_unprepare_etf() for | |
196 | * details. | |
197 | */ | |
198 | if (drvdata->buf) { | |
199 | memset(drvdata->buf, 0, drvdata->size); | |
200 | } else { | |
201 | used = true; | |
202 | drvdata->buf = buf; | |
6c6ed1e2 MP |
203 | } |
204 | ||
1d364034 | 205 | ret = tmc_etb_enable_hw(drvdata); |
f973d88b | 206 | if (!ret) { |
1d364034 | 207 | drvdata->mode = CS_MODE_SYSFS; |
f973d88b MP |
208 | atomic_inc(csdev->refcnt); |
209 | } else { | |
1d364034 SP |
210 | /* Free up the buffer if we failed to enable */ |
211 | used = false; | |
f973d88b | 212 | } |
de546197 | 213 | out: |
6c6ed1e2 MP |
214 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
215 | ||
de546197 | 216 | /* Free memory outside the spinlock if need be */ |
1d37ae50 | 217 | if (!used) |
de546197 MP |
218 | kfree(buf); |
219 | ||
de546197 | 220 | return ret; |
6c6ed1e2 MP |
221 | } |
222 | ||
3d6e8935 | 223 | static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data) |
b217601e MP |
224 | { |
225 | int ret = 0; | |
880af782 | 226 | pid_t pid; |
b217601e MP |
227 | unsigned long flags; |
228 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
3d6e8935 | 229 | struct perf_output_handle *handle = data; |
b217601e | 230 | |
b217601e | 231 | spin_lock_irqsave(&drvdata->spinlock, flags); |
1d364034 | 232 | do { |
b217601e | 233 | ret = -EINVAL; |
1d364034 SP |
234 | if (drvdata->reading) |
235 | break; | |
236 | /* | |
880af782 MP |
237 | * No need to continue if the ETB/ETF is already operated |
238 | * from sysFS. | |
1d364034 | 239 | */ |
880af782 MP |
240 | if (drvdata->mode == CS_MODE_SYSFS) { |
241 | ret = -EBUSY; | |
1d364034 | 242 | break; |
880af782 MP |
243 | } |
244 | ||
245 | /* Get a handle on the pid of the process to monitor */ | |
246 | pid = task_pid_nr(handle->event->owner); | |
247 | ||
248 | if (drvdata->pid != -1 && drvdata->pid != pid) { | |
249 | ret = -EBUSY; | |
250 | break; | |
251 | } | |
b217601e | 252 | |
1d364034 SP |
253 | ret = tmc_set_etf_buffer(csdev, handle); |
254 | if (ret) | |
255 | break; | |
880af782 MP |
256 | |
257 | /* | |
258 | * No HW configuration is needed if the sink is already in | |
259 | * use for this session. | |
260 | */ | |
261 | if (drvdata->pid == pid) { | |
262 | atomic_inc(csdev->refcnt); | |
263 | break; | |
264 | } | |
265 | ||
1d364034 | 266 | ret = tmc_etb_enable_hw(drvdata); |
f973d88b | 267 | if (!ret) { |
880af782 MP |
268 | /* Associate with monitored process. */ |
269 | drvdata->pid = pid; | |
1d364034 | 270 | drvdata->mode = CS_MODE_PERF; |
f973d88b MP |
271 | atomic_inc(csdev->refcnt); |
272 | } | |
1d364034 | 273 | } while (0); |
b217601e MP |
274 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
275 | ||
276 | return ret; | |
277 | } | |
278 | ||
3d6e8935 SP |
279 | static int tmc_enable_etf_sink(struct coresight_device *csdev, |
280 | u32 mode, void *data) | |
b217601e | 281 | { |
2cd54140 | 282 | int ret; |
2cd54140 | 283 | |
b217601e MP |
284 | switch (mode) { |
285 | case CS_MODE_SYSFS: | |
2cd54140 LY |
286 | ret = tmc_enable_etf_sink_sysfs(csdev); |
287 | break; | |
b217601e | 288 | case CS_MODE_PERF: |
3d6e8935 | 289 | ret = tmc_enable_etf_sink_perf(csdev, data); |
2cd54140 LY |
290 | break; |
291 | /* We shouldn't be here */ | |
292 | default: | |
293 | ret = -EINVAL; | |
294 | break; | |
b217601e MP |
295 | } |
296 | ||
2cd54140 LY |
297 | if (ret) |
298 | return ret; | |
299 | ||
9dd0a920 | 300 | dev_dbg(&csdev->dev, "TMC-ETB/ETF enabled\n"); |
2cd54140 | 301 | return 0; |
b217601e MP |
302 | } |
303 | ||
6c817a95 | 304 | static int tmc_disable_etf_sink(struct coresight_device *csdev) |
6c6ed1e2 MP |
305 | { |
306 | unsigned long flags; | |
307 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
308 | ||
309 | spin_lock_irqsave(&drvdata->spinlock, flags); | |
f973d88b | 310 | |
6c6ed1e2 MP |
311 | if (drvdata->reading) { |
312 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
6c817a95 | 313 | return -EBUSY; |
6c6ed1e2 MP |
314 | } |
315 | ||
f973d88b MP |
316 | if (atomic_dec_return(csdev->refcnt)) { |
317 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
318 | return -EBUSY; | |
319 | } | |
320 | ||
12dfc9e0 MP |
321 | /* Complain if we (somehow) got out of sync */ |
322 | WARN_ON_ONCE(drvdata->mode == CS_MODE_DISABLED); | |
323 | tmc_etb_disable_hw(drvdata); | |
880af782 MP |
324 | /* Dissociate from monitored process. */ |
325 | drvdata->pid = -1; | |
12dfc9e0 | 326 | drvdata->mode = CS_MODE_DISABLED; |
f2facc33 | 327 | |
6c6ed1e2 MP |
328 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
329 | ||
9dd0a920 | 330 | dev_dbg(&csdev->dev, "TMC-ETB/ETF disabled\n"); |
6c817a95 | 331 | return 0; |
6c6ed1e2 MP |
332 | } |
333 | ||
334 | static int tmc_enable_etf_link(struct coresight_device *csdev, | |
335 | int inport, int outport) | |
336 | { | |
edda32da | 337 | int ret = 0; |
6c6ed1e2 MP |
338 | unsigned long flags; |
339 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
edda32da | 340 | bool first_enable = false; |
6c6ed1e2 MP |
341 | |
342 | spin_lock_irqsave(&drvdata->spinlock, flags); | |
343 | if (drvdata->reading) { | |
344 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
345 | return -EBUSY; | |
346 | } | |
347 | ||
edda32da YC |
348 | if (atomic_read(&csdev->refcnt[0]) == 0) { |
349 | ret = tmc_etf_enable_hw(drvdata); | |
350 | if (!ret) { | |
351 | drvdata->mode = CS_MODE_SYSFS; | |
352 | first_enable = true; | |
353 | } | |
354 | } | |
1d364034 | 355 | if (!ret) |
edda32da | 356 | atomic_inc(&csdev->refcnt[0]); |
6c6ed1e2 MP |
357 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
358 | ||
edda32da | 359 | if (first_enable) |
9dd0a920 | 360 | dev_dbg(&csdev->dev, "TMC-ETF enabled\n"); |
1d364034 | 361 | return ret; |
6c6ed1e2 MP |
362 | } |
363 | ||
364 | static void tmc_disable_etf_link(struct coresight_device *csdev, | |
365 | int inport, int outport) | |
366 | { | |
367 | unsigned long flags; | |
368 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
edda32da | 369 | bool last_disable = false; |
6c6ed1e2 MP |
370 | |
371 | spin_lock_irqsave(&drvdata->spinlock, flags); | |
372 | if (drvdata->reading) { | |
373 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
374 | return; | |
375 | } | |
376 | ||
edda32da YC |
377 | if (atomic_dec_return(&csdev->refcnt[0]) == 0) { |
378 | tmc_etf_disable_hw(drvdata); | |
379 | drvdata->mode = CS_MODE_DISABLED; | |
380 | last_disable = true; | |
381 | } | |
6c6ed1e2 MP |
382 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
383 | ||
edda32da YC |
384 | if (last_disable) |
385 | dev_dbg(&csdev->dev, "TMC-ETF disabled\n"); | |
6c6ed1e2 MP |
386 | } |
387 | ||
a0f08a6a MP |
388 | static void *tmc_alloc_etf_buffer(struct coresight_device *csdev, |
389 | struct perf_event *event, void **pages, | |
390 | int nr_pages, bool overwrite) | |
2e499bbc | 391 | { |
024c1fd9 | 392 | int node; |
2e499bbc MP |
393 | struct cs_buffers *buf; |
394 | ||
024c1fd9 | 395 | node = (event->cpu == -1) ? NUMA_NO_NODE : cpu_to_node(event->cpu); |
2e499bbc MP |
396 | |
397 | /* Allocate memory structure for interaction with Perf */ | |
398 | buf = kzalloc_node(sizeof(struct cs_buffers), GFP_KERNEL, node); | |
399 | if (!buf) | |
400 | return NULL; | |
401 | ||
402 | buf->snapshot = overwrite; | |
403 | buf->nr_pages = nr_pages; | |
404 | buf->data_pages = pages; | |
405 | ||
406 | return buf; | |
407 | } | |
408 | ||
409 | static void tmc_free_etf_buffer(void *config) | |
410 | { | |
411 | struct cs_buffers *buf = config; | |
412 | ||
413 | kfree(buf); | |
414 | } | |
415 | ||
416 | static int tmc_set_etf_buffer(struct coresight_device *csdev, | |
3d6e8935 | 417 | struct perf_output_handle *handle) |
2e499bbc MP |
418 | { |
419 | int ret = 0; | |
420 | unsigned long head; | |
3d6e8935 SP |
421 | struct cs_buffers *buf = etm_perf_sink_config(handle); |
422 | ||
423 | if (!buf) | |
424 | return -EINVAL; | |
2e499bbc MP |
425 | |
426 | /* wrap head around to the amount of space we have */ | |
427 | head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1); | |
428 | ||
429 | /* find the page to write to */ | |
430 | buf->cur = head / PAGE_SIZE; | |
431 | ||
432 | /* and offset within that page */ | |
433 | buf->offset = head % PAGE_SIZE; | |
434 | ||
435 | local_set(&buf->data_size, 0); | |
436 | ||
437 | return ret; | |
438 | } | |
439 | ||
7ec786ad | 440 | static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev, |
2e499bbc MP |
441 | struct perf_output_handle *handle, |
442 | void *sink_config) | |
443 | { | |
cfd9f630 | 444 | bool lost = false; |
2e499bbc | 445 | int i, cur; |
0c3fc4d5 | 446 | const u32 *barrier; |
2e499bbc | 447 | u32 *buf_ptr; |
6f6ab4fc | 448 | u64 read_ptr, write_ptr; |
7ec786ad | 449 | u32 status; |
880af782 | 450 | unsigned long offset, to_read = 0, flags; |
2e499bbc MP |
451 | struct cs_buffers *buf = sink_config; |
452 | struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
453 | ||
454 | if (!buf) | |
7ec786ad | 455 | return 0; |
2e499bbc MP |
456 | |
457 | /* This shouldn't happen */ | |
297ab90f | 458 | if (WARN_ON_ONCE(drvdata->mode != CS_MODE_PERF)) |
7ec786ad | 459 | return 0; |
2e499bbc | 460 | |
0916447c | 461 | spin_lock_irqsave(&drvdata->spinlock, flags); |
880af782 MP |
462 | |
463 | /* Don't do anything if another tracer is using this sink */ | |
464 | if (atomic_read(csdev->refcnt) != 1) | |
465 | goto out; | |
466 | ||
2e499bbc MP |
467 | CS_UNLOCK(drvdata->base); |
468 | ||
469 | tmc_flush_and_stop(drvdata); | |
470 | ||
6f6ab4fc SP |
471 | read_ptr = tmc_read_rrp(drvdata); |
472 | write_ptr = tmc_read_rwp(drvdata); | |
2e499bbc MP |
473 | |
474 | /* | |
475 | * Get a hold of the status register and see if a wrap around | |
476 | * has occurred. If so adjust things accordingly. | |
477 | */ | |
478 | status = readl_relaxed(drvdata->base + TMC_STS); | |
479 | if (status & TMC_STS_FULL) { | |
cfd9f630 | 480 | lost = true; |
2e499bbc MP |
481 | to_read = drvdata->size; |
482 | } else { | |
483 | to_read = CIRC_CNT(write_ptr, read_ptr, drvdata->size); | |
484 | } | |
485 | ||
486 | /* | |
487 | * The TMC RAM buffer may be bigger than the space available in the | |
488 | * perf ring buffer (handle->size). If so advance the RRP so that we | |
99f81eb9 MP |
489 | * get the latest trace data. In snapshot mode none of that matters |
490 | * since we are expected to clobber stale data in favour of the latest | |
491 | * traces. | |
2e499bbc | 492 | */ |
99f81eb9 | 493 | if (!buf->snapshot && to_read > handle->size) { |
00bb485c | 494 | u32 mask = tmc_get_memwidth_mask(drvdata); |
2e499bbc MP |
495 | |
496 | /* | |
497 | * Make sure the new size is aligned in accordance with the | |
00bb485c | 498 | * requirement explained in function tmc_get_memwidth_mask(). |
2e499bbc MP |
499 | */ |
500 | to_read = handle->size & mask; | |
501 | /* Move the RAM read pointer up */ | |
502 | read_ptr = (write_ptr + drvdata->size) - to_read; | |
503 | /* Make sure we are still within our limits */ | |
504 | if (read_ptr > (drvdata->size - 1)) | |
505 | read_ptr -= drvdata->size; | |
506 | /* Tell the HW */ | |
6f6ab4fc | 507 | tmc_write_rrp(drvdata, read_ptr); |
cfd9f630 | 508 | lost = true; |
2e499bbc MP |
509 | } |
510 | ||
5aafd9bf MP |
511 | /* |
512 | * Don't set the TRUNCATED flag in snapshot mode because 1) the | |
513 | * captured buffer is expected to be truncated and 2) a full buffer | |
514 | * prevents the event from being re-enabled by the perf core, | |
515 | * resulting in stale data being send to user space. | |
516 | */ | |
517 | if (!buf->snapshot && lost) | |
cfd9f630 MP |
518 | perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED); |
519 | ||
2e499bbc MP |
520 | cur = buf->cur; |
521 | offset = buf->offset; | |
92fc7d81 | 522 | barrier = coresight_barrier_pkt; |
2e499bbc MP |
523 | |
524 | /* for every byte to read */ | |
525 | for (i = 0; i < to_read; i += 4) { | |
526 | buf_ptr = buf->data_pages[cur] + offset; | |
527 | *buf_ptr = readl_relaxed(drvdata->base + TMC_RRD); | |
528 | ||
0c3fc4d5 MP |
529 | if (lost && *barrier) { |
530 | *buf_ptr = *barrier; | |
531 | barrier++; | |
532 | } | |
533 | ||
2e499bbc MP |
534 | offset += 4; |
535 | if (offset >= PAGE_SIZE) { | |
536 | offset = 0; | |
537 | cur++; | |
538 | /* wrap around at the end of the buffer */ | |
539 | cur &= buf->nr_pages - 1; | |
540 | } | |
541 | } | |
542 | ||
0402f75e MP |
543 | /* |
544 | * In snapshot mode we simply increment the head by the number of byte | |
545 | * that were written. User space function cs_etm_find_snapshot() will | |
546 | * figure out how many bytes to get from the AUX buffer based on the | |
547 | * position of the head. | |
548 | */ | |
549 | if (buf->snapshot) | |
550 | handle->head += to_read; | |
551 | ||
2e499bbc | 552 | CS_LOCK(drvdata->base); |
880af782 | 553 | out: |
0916447c | 554 | spin_unlock_irqrestore(&drvdata->spinlock, flags); |
7ec786ad SP |
555 | |
556 | return to_read; | |
2e499bbc MP |
557 | } |
558 | ||
6c6ed1e2 MP |
559 | static const struct coresight_ops_sink tmc_etf_sink_ops = { |
560 | .enable = tmc_enable_etf_sink, | |
561 | .disable = tmc_disable_etf_sink, | |
2e499bbc MP |
562 | .alloc_buffer = tmc_alloc_etf_buffer, |
563 | .free_buffer = tmc_free_etf_buffer, | |
2e499bbc | 564 | .update_buffer = tmc_update_etf_buffer, |
6c6ed1e2 MP |
565 | }; |
566 | ||
567 | static const struct coresight_ops_link tmc_etf_link_ops = { | |
568 | .enable = tmc_enable_etf_link, | |
569 | .disable = tmc_disable_etf_link, | |
570 | }; | |
571 | ||
572 | const struct coresight_ops tmc_etb_cs_ops = { | |
573 | .sink_ops = &tmc_etf_sink_ops, | |
574 | }; | |
575 | ||
576 | const struct coresight_ops tmc_etf_cs_ops = { | |
577 | .sink_ops = &tmc_etf_sink_ops, | |
578 | .link_ops = &tmc_etf_link_ops, | |
579 | }; | |
4525412a MP |
580 | |
581 | int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) | |
582 | { | |
583 | enum tmc_mode mode; | |
584 | int ret = 0; | |
585 | unsigned long flags; | |
586 | ||
587 | /* config types are set a boot time and never change */ | |
588 | if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB && | |
589 | drvdata->config_type != TMC_CONFIG_TYPE_ETF)) | |
590 | return -EINVAL; | |
591 | ||
592 | spin_lock_irqsave(&drvdata->spinlock, flags); | |
593 | ||
f74debbe MP |
594 | if (drvdata->reading) { |
595 | ret = -EBUSY; | |
596 | goto out; | |
597 | } | |
598 | ||
b217601e | 599 | /* Don't interfere if operated from Perf */ |
297ab90f | 600 | if (drvdata->mode == CS_MODE_PERF) { |
b217601e MP |
601 | ret = -EINVAL; |
602 | goto out; | |
603 | } | |
604 | ||
de546197 MP |
605 | /* If drvdata::buf is NULL the trace data has been read already */ |
606 | if (drvdata->buf == NULL) { | |
607 | ret = -EINVAL; | |
608 | goto out; | |
609 | } | |
610 | ||
4525412a | 611 | /* Disable the TMC if need be */ |
347adb0d SPR |
612 | if (drvdata->mode == CS_MODE_SYSFS) { |
613 | /* There is no point in reading a TMC in HW FIFO mode */ | |
614 | mode = readl_relaxed(drvdata->base + TMC_MODE); | |
615 | if (mode != TMC_MODE_CIRCULAR_BUFFER) { | |
616 | ret = -EINVAL; | |
617 | goto out; | |
618 | } | |
4d3ebd36 | 619 | __tmc_etb_disable_hw(drvdata); |
347adb0d | 620 | } |
4525412a MP |
621 | |
622 | drvdata->reading = true; | |
623 | out: | |
624 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
625 | ||
626 | return ret; | |
627 | } | |
628 | ||
629 | int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata) | |
630 | { | |
de546197 | 631 | char *buf = NULL; |
4525412a MP |
632 | enum tmc_mode mode; |
633 | unsigned long flags; | |
634 | ||
635 | /* config types are set a boot time and never change */ | |
636 | if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB && | |
637 | drvdata->config_type != TMC_CONFIG_TYPE_ETF)) | |
638 | return -EINVAL; | |
639 | ||
640 | spin_lock_irqsave(&drvdata->spinlock, flags); | |
641 | ||
4525412a | 642 | /* Re-enable the TMC if need be */ |
297ab90f | 643 | if (drvdata->mode == CS_MODE_SYSFS) { |
d021f5c5 SPR |
644 | /* There is no point in reading a TMC in HW FIFO mode */ |
645 | mode = readl_relaxed(drvdata->base + TMC_MODE); | |
646 | if (mode != TMC_MODE_CIRCULAR_BUFFER) { | |
647 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
648 | return -EINVAL; | |
649 | } | |
de546197 MP |
650 | /* |
651 | * The trace run will continue with the same allocated trace | |
652 | * buffer. As such zero-out the buffer so that we don't end | |
653 | * up with stale data. | |
654 | * | |
655 | * Since the tracer is still enabled drvdata::buf | |
656 | * can't be NULL. | |
657 | */ | |
658 | memset(drvdata->buf, 0, drvdata->size); | |
1d364034 | 659 | __tmc_etb_enable_hw(drvdata); |
de546197 MP |
660 | } else { |
661 | /* | |
662 | * The ETB/ETF is not tracing and the buffer was just read. | |
663 | * As such prepare to free the trace buffer. | |
664 | */ | |
665 | buf = drvdata->buf; | |
666 | drvdata->buf = NULL; | |
667 | } | |
4525412a MP |
668 | |
669 | drvdata->reading = false; | |
670 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
671 | ||
de546197 MP |
672 | /* |
673 | * Free allocated memory outside of the spinlock. There is no need | |
674 | * to assert the validity of 'buf' since calling kfree(NULL) is safe. | |
675 | */ | |
676 | kfree(buf); | |
677 | ||
4525412a MP |
678 | return 0; |
679 | } |