Commit | Line | Data |
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a939fc5a | 1 | /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. |
941943cf PG |
2 | * |
3 | * Description: CoreSight Program Flow Trace driver | |
a939fc5a PP |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 and | |
7 | * only version 2 as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
941943cf | 16 | #include <linux/moduleparam.h> |
a939fc5a PP |
17 | #include <linux/init.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/io.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/smp.h> | |
26 | #include <linux/sysfs.h> | |
27 | #include <linux/stat.h> | |
ec360059 | 28 | #include <linux/pm_runtime.h> |
a939fc5a PP |
29 | #include <linux/cpu.h> |
30 | #include <linux/of.h> | |
31 | #include <linux/coresight.h> | |
17534ceb | 32 | #include <linux/coresight-pmu.h> |
a939fc5a PP |
33 | #include <linux/amba/bus.h> |
34 | #include <linux/seq_file.h> | |
35 | #include <linux/uaccess.h> | |
d1839e68 | 36 | #include <linux/clk.h> |
882d5e11 | 37 | #include <linux/perf_event.h> |
a939fc5a PP |
38 | #include <asm/sections.h> |
39 | ||
40 | #include "coresight-etm.h" | |
0bcbf2e3 | 41 | #include "coresight-etm-perf.h" |
a939fc5a | 42 | |
941943cf PG |
43 | /* |
44 | * Not really modular but using module_param is the easiest way to | |
45 | * remain consistent with existing use cases for now. | |
46 | */ | |
a939fc5a | 47 | static int boot_enable; |
406b9f65 | 48 | module_param_named(boot_enable, boot_enable, int, S_IRUGO); |
a939fc5a PP |
49 | |
50 | /* The number of ETM/PTM currently registered */ | |
51 | static int etm_count; | |
52 | static struct etm_drvdata *etmdrvdata[NR_CPUS]; | |
53 | ||
2b5283d1 RC |
54 | static enum cpuhp_state hp_online; |
55 | ||
a939fc5a PP |
56 | /* |
57 | * Memory mapped writes to clear os lock are not supported on some processors | |
58 | * and OS lock must be unlocked before any memory mapped access on such | |
59 | * processors, otherwise memory mapped reads/writes will be invalid. | |
60 | */ | |
ae69a1da | 61 | static void etm_os_unlock(struct etm_drvdata *drvdata) |
a939fc5a | 62 | { |
a939fc5a PP |
63 | /* Writing any value to ETMOSLAR unlocks the trace registers */ |
64 | etm_writel(drvdata, 0x0, ETMOSLAR); | |
ae69a1da | 65 | drvdata->os_unlock = true; |
a939fc5a PP |
66 | isb(); |
67 | } | |
68 | ||
69 | static void etm_set_pwrdwn(struct etm_drvdata *drvdata) | |
70 | { | |
71 | u32 etmcr; | |
72 | ||
73 | /* Ensure pending cp14 accesses complete before setting pwrdwn */ | |
74 | mb(); | |
75 | isb(); | |
76 | etmcr = etm_readl(drvdata, ETMCR); | |
77 | etmcr |= ETMCR_PWD_DWN; | |
78 | etm_writel(drvdata, etmcr, ETMCR); | |
79 | } | |
80 | ||
81 | static void etm_clr_pwrdwn(struct etm_drvdata *drvdata) | |
82 | { | |
83 | u32 etmcr; | |
84 | ||
85 | etmcr = etm_readl(drvdata, ETMCR); | |
86 | etmcr &= ~ETMCR_PWD_DWN; | |
87 | etm_writel(drvdata, etmcr, ETMCR); | |
88 | /* Ensure pwrup completes before subsequent cp14 accesses */ | |
89 | mb(); | |
90 | isb(); | |
91 | } | |
92 | ||
93 | static void etm_set_pwrup(struct etm_drvdata *drvdata) | |
94 | { | |
95 | u32 etmpdcr; | |
96 | ||
97 | etmpdcr = readl_relaxed(drvdata->base + ETMPDCR); | |
98 | etmpdcr |= ETMPDCR_PWD_UP; | |
99 | writel_relaxed(etmpdcr, drvdata->base + ETMPDCR); | |
100 | /* Ensure pwrup completes before subsequent cp14 accesses */ | |
101 | mb(); | |
102 | isb(); | |
103 | } | |
104 | ||
105 | static void etm_clr_pwrup(struct etm_drvdata *drvdata) | |
106 | { | |
107 | u32 etmpdcr; | |
108 | ||
109 | /* Ensure pending cp14 accesses complete before clearing pwrup */ | |
110 | mb(); | |
111 | isb(); | |
112 | etmpdcr = readl_relaxed(drvdata->base + ETMPDCR); | |
113 | etmpdcr &= ~ETMPDCR_PWD_UP; | |
114 | writel_relaxed(etmpdcr, drvdata->base + ETMPDCR); | |
115 | } | |
116 | ||
117 | /** | |
118 | * coresight_timeout_etm - loop until a bit has changed to a specific state. | |
119 | * @drvdata: etm's private data structure. | |
120 | * @offset: address of a register, starting from @addr. | |
121 | * @position: the position of the bit of interest. | |
122 | * @value: the value the bit should have. | |
123 | * | |
124 | * Basically the same as @coresight_timeout except for the register access | |
125 | * method where we have to account for CP14 configurations. | |
126 | ||
127 | * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if | |
128 | * TIMEOUT_US has elapsed, which ever happens first. | |
129 | */ | |
130 | ||
131 | static int coresight_timeout_etm(struct etm_drvdata *drvdata, u32 offset, | |
132 | int position, int value) | |
133 | { | |
134 | int i; | |
135 | u32 val; | |
136 | ||
137 | for (i = TIMEOUT_US; i > 0; i--) { | |
138 | val = etm_readl(drvdata, offset); | |
139 | /* Waiting on the bit to go from 0 to 1 */ | |
140 | if (value) { | |
141 | if (val & BIT(position)) | |
142 | return 0; | |
143 | /* Waiting on the bit to go from 1 to 0 */ | |
144 | } else { | |
145 | if (!(val & BIT(position))) | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* | |
150 | * Delay is arbitrary - the specification doesn't say how long | |
151 | * we are expected to wait. Extra check required to make sure | |
152 | * we don't wait needlessly on the last iteration. | |
153 | */ | |
154 | if (i - 1) | |
155 | udelay(1); | |
156 | } | |
157 | ||
158 | return -EAGAIN; | |
159 | } | |
160 | ||
161 | ||
162 | static void etm_set_prog(struct etm_drvdata *drvdata) | |
163 | { | |
164 | u32 etmcr; | |
165 | ||
166 | etmcr = etm_readl(drvdata, ETMCR); | |
167 | etmcr |= ETMCR_ETM_PRG; | |
168 | etm_writel(drvdata, etmcr, ETMCR); | |
169 | /* | |
170 | * Recommended by spec for cp14 accesses to ensure etmcr write is | |
171 | * complete before polling etmsr | |
172 | */ | |
173 | isb(); | |
174 | if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 1)) { | |
175 | dev_err(drvdata->dev, | |
af616215 MP |
176 | "%s: timeout observed when probing at offset %#x\n", |
177 | __func__, ETMSR); | |
a939fc5a PP |
178 | } |
179 | } | |
180 | ||
181 | static void etm_clr_prog(struct etm_drvdata *drvdata) | |
182 | { | |
183 | u32 etmcr; | |
184 | ||
185 | etmcr = etm_readl(drvdata, ETMCR); | |
186 | etmcr &= ~ETMCR_ETM_PRG; | |
187 | etm_writel(drvdata, etmcr, ETMCR); | |
188 | /* | |
189 | * Recommended by spec for cp14 accesses to ensure etmcr write is | |
190 | * complete before polling etmsr | |
191 | */ | |
192 | isb(); | |
193 | if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 0)) { | |
194 | dev_err(drvdata->dev, | |
af616215 MP |
195 | "%s: timeout observed when probing at offset %#x\n", |
196 | __func__, ETMSR); | |
a939fc5a PP |
197 | } |
198 | } | |
199 | ||
1925a470 | 200 | void etm_set_default(struct etm_config *config) |
a939fc5a PP |
201 | { |
202 | int i; | |
203 | ||
1925a470 MP |
204 | if (WARN_ON_ONCE(!config)) |
205 | return; | |
206 | ||
c528a25a MP |
207 | /* |
208 | * Taken verbatim from the TRM: | |
209 | * | |
210 | * To trace all memory: | |
211 | * set bit [24] in register 0x009, the ETMTECR1, to 1 | |
212 | * set all other bits in register 0x009, the ETMTECR1, to 0 | |
213 | * set all bits in register 0x007, the ETMTECR2, to 0 | |
214 | * set register 0x008, the ETMTEEVR, to 0x6F (TRUE). | |
215 | */ | |
216 | config->enable_ctrl1 = BIT(24); | |
217 | config->enable_ctrl2 = 0x0; | |
218 | config->enable_event = ETM_HARD_WIRE_RES_A; | |
219 | ||
1925a470 MP |
220 | config->trigger_event = ETM_DEFAULT_EVENT_VAL; |
221 | config->enable_event = ETM_HARD_WIRE_RES_A; | |
222 | ||
223 | config->seq_12_event = ETM_DEFAULT_EVENT_VAL; | |
224 | config->seq_21_event = ETM_DEFAULT_EVENT_VAL; | |
225 | config->seq_23_event = ETM_DEFAULT_EVENT_VAL; | |
226 | config->seq_31_event = ETM_DEFAULT_EVENT_VAL; | |
227 | config->seq_32_event = ETM_DEFAULT_EVENT_VAL; | |
228 | config->seq_13_event = ETM_DEFAULT_EVENT_VAL; | |
229 | config->timestamp_event = ETM_DEFAULT_EVENT_VAL; | |
230 | ||
231 | for (i = 0; i < ETM_MAX_CNTR; i++) { | |
232 | config->cntr_rld_val[i] = 0x0; | |
233 | config->cntr_event[i] = ETM_DEFAULT_EVENT_VAL; | |
234 | config->cntr_rld_event[i] = ETM_DEFAULT_EVENT_VAL; | |
235 | config->cntr_val[i] = 0x0; | |
a939fc5a PP |
236 | } |
237 | ||
1925a470 MP |
238 | config->seq_curr_state = 0x0; |
239 | config->ctxid_idx = 0x0; | |
240 | for (i = 0; i < ETM_MAX_CTXID_CMP; i++) { | |
241 | config->ctxid_pid[i] = 0x0; | |
242 | config->ctxid_vpid[i] = 0x0; | |
a440617e CZ |
243 | } |
244 | ||
1925a470 | 245 | config->ctxid_mask = 0x0; |
a939fc5a PP |
246 | } |
247 | ||
2127154d MP |
248 | void etm_config_trace_mode(struct etm_config *config) |
249 | { | |
250 | u32 flags, mode; | |
251 | ||
252 | mode = config->mode; | |
253 | ||
254 | mode &= (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER); | |
255 | ||
256 | /* excluding kernel AND user space doesn't make sense */ | |
257 | if (mode == (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER)) | |
258 | return; | |
259 | ||
260 | /* nothing to do if neither flags are set */ | |
261 | if (!(mode & ETM_MODE_EXCL_KERN) && !(mode & ETM_MODE_EXCL_USER)) | |
262 | return; | |
263 | ||
264 | flags = (1 << 0 | /* instruction execute */ | |
265 | 3 << 3 | /* ARM instruction */ | |
266 | 0 << 5 | /* No data value comparison */ | |
267 | 0 << 7 | /* No exact mach */ | |
268 | 0 << 8); /* Ignore context ID */ | |
269 | ||
270 | /* No need to worry about single address comparators. */ | |
271 | config->enable_ctrl2 = 0x0; | |
272 | ||
273 | /* Bit 0 is address range comparator 1 */ | |
274 | config->enable_ctrl1 = ETMTECR1_ADDR_COMP_1; | |
275 | ||
276 | /* | |
277 | * On ETMv3.5: | |
278 | * ETMACTRn[13,11] == Non-secure state comparison control | |
279 | * ETMACTRn[12,10] == Secure state comparison control | |
280 | * | |
281 | * b00 == Match in all modes in this state | |
282 | * b01 == Do not match in any more in this state | |
283 | * b10 == Match in all modes excepts user mode in this state | |
284 | * b11 == Match only in user mode in this state | |
285 | */ | |
286 | ||
287 | /* Tracing in secure mode is not supported at this time */ | |
288 | flags |= (0 << 12 | 1 << 10); | |
289 | ||
290 | if (mode & ETM_MODE_EXCL_USER) { | |
291 | /* exclude user, match all modes except user mode */ | |
292 | flags |= (1 << 13 | 0 << 11); | |
293 | } else { | |
294 | /* exclude kernel, match only in user mode */ | |
295 | flags |= (1 << 13 | 1 << 11); | |
296 | } | |
297 | ||
298 | /* | |
299 | * The ETMEEVR register is already set to "hard wire A". As such | |
300 | * all there is to do is setup an address comparator that spans | |
301 | * the entire address range and configure the state and mode bits. | |
302 | */ | |
303 | config->addr_val[0] = (u32) 0x0; | |
304 | config->addr_val[1] = (u32) ~0x0; | |
305 | config->addr_acctype[0] = flags; | |
306 | config->addr_acctype[1] = flags; | |
307 | config->addr_type[0] = ETM_ADDR_TYPE_RANGE; | |
308 | config->addr_type[1] = ETM_ADDR_TYPE_RANGE; | |
309 | } | |
310 | ||
882d5e11 MP |
311 | #define ETM3X_SUPPORTED_OPTIONS (ETMCR_CYC_ACC | ETMCR_TIMESTAMP_EN) |
312 | ||
313 | static int etm_parse_event_config(struct etm_drvdata *drvdata, | |
68905d73 | 314 | struct perf_event *event) |
882d5e11 MP |
315 | { |
316 | struct etm_config *config = &drvdata->config; | |
68905d73 | 317 | struct perf_event_attr *attr = &event->attr; |
882d5e11 MP |
318 | |
319 | if (!attr) | |
320 | return -EINVAL; | |
321 | ||
322 | /* Clear configuration from previous run */ | |
323 | memset(config, 0, sizeof(struct etm_config)); | |
324 | ||
325 | if (attr->exclude_kernel) | |
326 | config->mode = ETM_MODE_EXCL_KERN; | |
327 | ||
328 | if (attr->exclude_user) | |
329 | config->mode = ETM_MODE_EXCL_USER; | |
330 | ||
331 | /* Always start from the default config */ | |
332 | etm_set_default(config); | |
333 | ||
334 | /* | |
335 | * By default the tracers are configured to trace the whole address | |
336 | * range. Narrow the field only if requested by user space. | |
337 | */ | |
338 | if (config->mode) | |
339 | etm_config_trace_mode(config); | |
340 | ||
341 | /* | |
342 | * At this time only cycle accurate and timestamp options are | |
343 | * available. | |
344 | */ | |
345 | if (attr->config & ~ETM3X_SUPPORTED_OPTIONS) | |
346 | return -EINVAL; | |
347 | ||
348 | config->ctrl = attr->config; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
a939fc5a PP |
353 | static void etm_enable_hw(void *info) |
354 | { | |
355 | int i; | |
356 | u32 etmcr; | |
357 | struct etm_drvdata *drvdata = info; | |
1925a470 | 358 | struct etm_config *config = &drvdata->config; |
a939fc5a PP |
359 | |
360 | CS_UNLOCK(drvdata->base); | |
361 | ||
362 | /* Turn engine on */ | |
363 | etm_clr_pwrdwn(drvdata); | |
364 | /* Apply power to trace registers */ | |
365 | etm_set_pwrup(drvdata); | |
366 | /* Make sure all registers are accessible */ | |
367 | etm_os_unlock(drvdata); | |
368 | ||
369 | etm_set_prog(drvdata); | |
370 | ||
371 | etmcr = etm_readl(drvdata, ETMCR); | |
882d5e11 MP |
372 | /* Clear setting from a previous run if need be */ |
373 | etmcr &= ~ETM3X_SUPPORTED_OPTIONS; | |
a939fc5a | 374 | etmcr |= drvdata->port_size; |
882d5e11 | 375 | etmcr |= ETMCR_ETM_EN; |
1925a470 MP |
376 | etm_writel(drvdata, config->ctrl | etmcr, ETMCR); |
377 | etm_writel(drvdata, config->trigger_event, ETMTRIGGER); | |
378 | etm_writel(drvdata, config->startstop_ctrl, ETMTSSCR); | |
379 | etm_writel(drvdata, config->enable_event, ETMTEEVR); | |
380 | etm_writel(drvdata, config->enable_ctrl1, ETMTECR1); | |
381 | etm_writel(drvdata, config->fifofull_level, ETMFFLR); | |
a939fc5a | 382 | for (i = 0; i < drvdata->nr_addr_cmp; i++) { |
1925a470 MP |
383 | etm_writel(drvdata, config->addr_val[i], ETMACVRn(i)); |
384 | etm_writel(drvdata, config->addr_acctype[i], ETMACTRn(i)); | |
a939fc5a PP |
385 | } |
386 | for (i = 0; i < drvdata->nr_cntr; i++) { | |
1925a470 MP |
387 | etm_writel(drvdata, config->cntr_rld_val[i], ETMCNTRLDVRn(i)); |
388 | etm_writel(drvdata, config->cntr_event[i], ETMCNTENRn(i)); | |
389 | etm_writel(drvdata, config->cntr_rld_event[i], | |
a939fc5a | 390 | ETMCNTRLDEVRn(i)); |
1925a470 | 391 | etm_writel(drvdata, config->cntr_val[i], ETMCNTVRn(i)); |
a939fc5a | 392 | } |
1925a470 MP |
393 | etm_writel(drvdata, config->seq_12_event, ETMSQ12EVR); |
394 | etm_writel(drvdata, config->seq_21_event, ETMSQ21EVR); | |
395 | etm_writel(drvdata, config->seq_23_event, ETMSQ23EVR); | |
396 | etm_writel(drvdata, config->seq_31_event, ETMSQ31EVR); | |
397 | etm_writel(drvdata, config->seq_32_event, ETMSQ32EVR); | |
398 | etm_writel(drvdata, config->seq_13_event, ETMSQ13EVR); | |
399 | etm_writel(drvdata, config->seq_curr_state, ETMSQR); | |
a939fc5a PP |
400 | for (i = 0; i < drvdata->nr_ext_out; i++) |
401 | etm_writel(drvdata, ETM_DEFAULT_EVENT_VAL, ETMEXTOUTEVRn(i)); | |
402 | for (i = 0; i < drvdata->nr_ctxid_cmp; i++) | |
1925a470 MP |
403 | etm_writel(drvdata, config->ctxid_pid[i], ETMCIDCVRn(i)); |
404 | etm_writel(drvdata, config->ctxid_mask, ETMCIDCMR); | |
405 | etm_writel(drvdata, config->sync_freq, ETMSYNCFR); | |
a939fc5a PP |
406 | /* No external input selected */ |
407 | etm_writel(drvdata, 0x0, ETMEXTINSELR); | |
1925a470 | 408 | etm_writel(drvdata, config->timestamp_event, ETMTSEVR); |
a939fc5a PP |
409 | /* No auxiliary control selected */ |
410 | etm_writel(drvdata, 0x0, ETMAUXCR); | |
411 | etm_writel(drvdata, drvdata->traceid, ETMTRACEIDR); | |
412 | /* No VMID comparator value selected */ | |
413 | etm_writel(drvdata, 0x0, ETMVMIDCVR); | |
414 | ||
a939fc5a PP |
415 | etm_clr_prog(drvdata); |
416 | CS_LOCK(drvdata->base); | |
417 | ||
418 | dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu); | |
419 | } | |
420 | ||
52210c87 MP |
421 | static int etm_cpu_id(struct coresight_device *csdev) |
422 | { | |
423 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
424 | ||
425 | return drvdata->cpu; | |
426 | } | |
427 | ||
c04148e7 | 428 | int etm_get_trace_id(struct etm_drvdata *drvdata) |
a939fc5a | 429 | { |
a939fc5a PP |
430 | unsigned long flags; |
431 | int trace_id = -1; | |
432 | ||
c04148e7 MP |
433 | if (!drvdata) |
434 | goto out; | |
435 | ||
22fd532e | 436 | if (!local_read(&drvdata->mode)) |
a939fc5a | 437 | return drvdata->traceid; |
c04148e7 MP |
438 | |
439 | pm_runtime_get_sync(drvdata->dev); | |
a939fc5a PP |
440 | |
441 | spin_lock_irqsave(&drvdata->spinlock, flags); | |
442 | ||
443 | CS_UNLOCK(drvdata->base); | |
444 | trace_id = (etm_readl(drvdata, ETMTRACEIDR) & ETM_TRACEID_MASK); | |
445 | CS_LOCK(drvdata->base); | |
446 | ||
447 | spin_unlock_irqrestore(&drvdata->spinlock, flags); | |
c04148e7 | 448 | pm_runtime_put(drvdata->dev); |
ec360059 | 449 | |
c04148e7 | 450 | out: |
a939fc5a | 451 | return trace_id; |
c04148e7 MP |
452 | |
453 | } | |
454 | ||
455 | static int etm_trace_id(struct coresight_device *csdev) | |
456 | { | |
457 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
458 | ||
459 | return etm_get_trace_id(drvdata); | |
a939fc5a PP |
460 | } |
461 | ||
882d5e11 | 462 | static int etm_enable_perf(struct coresight_device *csdev, |
68905d73 | 463 | struct perf_event *event) |
882d5e11 MP |
464 | { |
465 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
466 | ||
467 | if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) | |
468 | return -EINVAL; | |
469 | ||
470 | /* Configure the tracer based on the session's specifics */ | |
68905d73 | 471 | etm_parse_event_config(drvdata, event); |
882d5e11 MP |
472 | /* And enable it */ |
473 | etm_enable_hw(drvdata); | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
22fd532e | 478 | static int etm_enable_sysfs(struct coresight_device *csdev) |
a939fc5a PP |
479 | { |
480 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
481 | int ret; | |
482 | ||
a939fc5a PP |
483 | spin_lock(&drvdata->spinlock); |
484 | ||
485 | /* | |
486 | * Configure the ETM only if the CPU is online. If it isn't online | |
2b5283d1 | 487 | * hw configuration will take place on the local CPU during bring up. |
a939fc5a PP |
488 | */ |
489 | if (cpu_online(drvdata->cpu)) { | |
490 | ret = smp_call_function_single(drvdata->cpu, | |
491 | etm_enable_hw, drvdata, 1); | |
492 | if (ret) | |
493 | goto err; | |
494 | } | |
495 | ||
a939fc5a | 496 | drvdata->sticky_enable = true; |
a939fc5a PP |
497 | spin_unlock(&drvdata->spinlock); |
498 | ||
499 | dev_info(drvdata->dev, "ETM tracing enabled\n"); | |
500 | return 0; | |
22fd532e | 501 | |
a939fc5a PP |
502 | err: |
503 | spin_unlock(&drvdata->spinlock); | |
a939fc5a PP |
504 | return ret; |
505 | } | |
506 | ||
882d5e11 | 507 | static int etm_enable(struct coresight_device *csdev, |
68905d73 | 508 | struct perf_event *event, u32 mode) |
22fd532e MP |
509 | { |
510 | int ret; | |
511 | u32 val; | |
512 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
513 | ||
514 | val = local_cmpxchg(&drvdata->mode, CS_MODE_DISABLED, mode); | |
515 | ||
516 | /* Someone is already using the tracer */ | |
517 | if (val) | |
518 | return -EBUSY; | |
519 | ||
520 | switch (mode) { | |
521 | case CS_MODE_SYSFS: | |
522 | ret = etm_enable_sysfs(csdev); | |
523 | break; | |
882d5e11 | 524 | case CS_MODE_PERF: |
68905d73 | 525 | ret = etm_enable_perf(csdev, event); |
882d5e11 | 526 | break; |
22fd532e MP |
527 | default: |
528 | ret = -EINVAL; | |
529 | } | |
530 | ||
531 | /* The tracer didn't start */ | |
532 | if (ret) | |
533 | local_set(&drvdata->mode, CS_MODE_DISABLED); | |
534 | ||
535 | return ret; | |
536 | } | |
537 | ||
a939fc5a PP |
538 | static void etm_disable_hw(void *info) |
539 | { | |
540 | int i; | |
541 | struct etm_drvdata *drvdata = info; | |
1925a470 | 542 | struct etm_config *config = &drvdata->config; |
a939fc5a PP |
543 | |
544 | CS_UNLOCK(drvdata->base); | |
545 | etm_set_prog(drvdata); | |
546 | ||
a939fc5a | 547 | /* Read back sequencer and counters for post trace analysis */ |
1925a470 | 548 | config->seq_curr_state = (etm_readl(drvdata, ETMSQR) & ETM_SQR_MASK); |
a939fc5a PP |
549 | |
550 | for (i = 0; i < drvdata->nr_cntr; i++) | |
1925a470 | 551 | config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i)); |
a939fc5a PP |
552 | |
553 | etm_set_pwrdwn(drvdata); | |
554 | CS_LOCK(drvdata->base); | |
555 | ||
556 | dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu); | |
557 | } | |
558 | ||
882d5e11 MP |
559 | static void etm_disable_perf(struct coresight_device *csdev) |
560 | { | |
561 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
562 | ||
563 | if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) | |
564 | return; | |
565 | ||
566 | CS_UNLOCK(drvdata->base); | |
567 | ||
568 | /* Setting the prog bit disables tracing immediately */ | |
569 | etm_set_prog(drvdata); | |
570 | ||
571 | /* | |
572 | * There is no way to know when the tracer will be used again so | |
573 | * power down the tracer. | |
574 | */ | |
575 | etm_set_pwrdwn(drvdata); | |
576 | ||
577 | CS_LOCK(drvdata->base); | |
578 | } | |
579 | ||
22fd532e | 580 | static void etm_disable_sysfs(struct coresight_device *csdev) |
a939fc5a PP |
581 | { |
582 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
583 | ||
584 | /* | |
585 | * Taking hotplug lock here protects from clocks getting disabled | |
586 | * with tracing being left on (crash scenario) if user disable occurs | |
587 | * after cpu online mask indicates the cpu is offline but before the | |
588 | * DYING hotplug callback is serviced by the ETM driver. | |
589 | */ | |
590 | get_online_cpus(); | |
591 | spin_lock(&drvdata->spinlock); | |
592 | ||
593 | /* | |
594 | * Executing etm_disable_hw on the cpu whose ETM is being disabled | |
595 | * ensures that register writes occur when cpu is powered. | |
596 | */ | |
597 | smp_call_function_single(drvdata->cpu, etm_disable_hw, drvdata, 1); | |
a939fc5a PP |
598 | |
599 | spin_unlock(&drvdata->spinlock); | |
600 | put_online_cpus(); | |
a939fc5a PP |
601 | |
602 | dev_info(drvdata->dev, "ETM tracing disabled\n"); | |
603 | } | |
604 | ||
68905d73 MP |
605 | static void etm_disable(struct coresight_device *csdev, |
606 | struct perf_event *event) | |
22fd532e MP |
607 | { |
608 | u32 mode; | |
609 | struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
610 | ||
611 | /* | |
612 | * For as long as the tracer isn't disabled another entity can't | |
613 | * change its status. As such we can read the status here without | |
614 | * fearing it will change under us. | |
615 | */ | |
616 | mode = local_read(&drvdata->mode); | |
617 | ||
618 | switch (mode) { | |
619 | case CS_MODE_DISABLED: | |
620 | break; | |
621 | case CS_MODE_SYSFS: | |
622 | etm_disable_sysfs(csdev); | |
623 | break; | |
882d5e11 MP |
624 | case CS_MODE_PERF: |
625 | etm_disable_perf(csdev); | |
626 | break; | |
22fd532e MP |
627 | default: |
628 | WARN_ON_ONCE(mode); | |
629 | return; | |
630 | } | |
631 | ||
632 | if (mode) | |
633 | local_set(&drvdata->mode, CS_MODE_DISABLED); | |
634 | } | |
635 | ||
a939fc5a | 636 | static const struct coresight_ops_source etm_source_ops = { |
52210c87 | 637 | .cpu_id = etm_cpu_id, |
a939fc5a PP |
638 | .trace_id = etm_trace_id, |
639 | .enable = etm_enable, | |
640 | .disable = etm_disable, | |
641 | }; | |
642 | ||
643 | static const struct coresight_ops etm_cs_ops = { | |
644 | .source_ops = &etm_source_ops, | |
645 | }; | |
646 | ||
2b5283d1 | 647 | static int etm_online_cpu(unsigned int cpu) |
a939fc5a | 648 | { |
a939fc5a | 649 | if (!etmdrvdata[cpu]) |
2b5283d1 | 650 | return 0; |
a939fc5a | 651 | |
2b5283d1 RC |
652 | if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable) |
653 | coresight_enable(etmdrvdata[cpu]->csdev); | |
654 | return 0; | |
655 | } | |
a939fc5a | 656 | |
2b5283d1 RC |
657 | static int etm_starting_cpu(unsigned int cpu) |
658 | { | |
659 | if (!etmdrvdata[cpu]) | |
660 | return 0; | |
a939fc5a | 661 | |
2b5283d1 RC |
662 | spin_lock(&etmdrvdata[cpu]->spinlock); |
663 | if (!etmdrvdata[cpu]->os_unlock) { | |
664 | etm_os_unlock(etmdrvdata[cpu]); | |
665 | etmdrvdata[cpu]->os_unlock = true; | |
a939fc5a | 666 | } |
2b5283d1 RC |
667 | |
668 | if (local_read(&etmdrvdata[cpu]->mode)) | |
669 | etm_enable_hw(etmdrvdata[cpu]); | |
670 | spin_unlock(&etmdrvdata[cpu]->spinlock); | |
671 | return 0; | |
a939fc5a PP |
672 | } |
673 | ||
2b5283d1 RC |
674 | static int etm_dying_cpu(unsigned int cpu) |
675 | { | |
676 | if (!etmdrvdata[cpu]) | |
677 | return 0; | |
678 | ||
679 | spin_lock(&etmdrvdata[cpu]->spinlock); | |
680 | if (local_read(&etmdrvdata[cpu]->mode)) | |
681 | etm_disable_hw(etmdrvdata[cpu]); | |
682 | spin_unlock(&etmdrvdata[cpu]->spinlock); | |
683 | return 0; | |
684 | } | |
a939fc5a PP |
685 | |
686 | static bool etm_arch_supported(u8 arch) | |
687 | { | |
688 | switch (arch) { | |
689 | case ETM_ARCH_V3_3: | |
690 | break; | |
691 | case ETM_ARCH_V3_5: | |
692 | break; | |
693 | case PFT_ARCH_V1_0: | |
694 | break; | |
695 | case PFT_ARCH_V1_1: | |
696 | break; | |
697 | default: | |
698 | return false; | |
699 | } | |
700 | return true; | |
701 | } | |
702 | ||
703 | static void etm_init_arch_data(void *info) | |
704 | { | |
705 | u32 etmidr; | |
706 | u32 etmccr; | |
707 | struct etm_drvdata *drvdata = info; | |
708 | ||
ae69a1da MP |
709 | /* Make sure all registers are accessible */ |
710 | etm_os_unlock(drvdata); | |
711 | ||
a939fc5a PP |
712 | CS_UNLOCK(drvdata->base); |
713 | ||
714 | /* First dummy read */ | |
715 | (void)etm_readl(drvdata, ETMPDSR); | |
716 | /* Provide power to ETM: ETMPDCR[3] == 1 */ | |
717 | etm_set_pwrup(drvdata); | |
718 | /* | |
719 | * Clear power down bit since when this bit is set writes to | |
720 | * certain registers might be ignored. | |
721 | */ | |
722 | etm_clr_pwrdwn(drvdata); | |
723 | /* | |
724 | * Set prog bit. It will be set from reset but this is included to | |
725 | * ensure it is set | |
726 | */ | |
727 | etm_set_prog(drvdata); | |
728 | ||
729 | /* Find all capabilities */ | |
730 | etmidr = etm_readl(drvdata, ETMIDR); | |
731 | drvdata->arch = BMVAL(etmidr, 4, 11); | |
732 | drvdata->port_size = etm_readl(drvdata, ETMCR) & PORT_SIZE_MASK; | |
733 | ||
734 | drvdata->etmccer = etm_readl(drvdata, ETMCCER); | |
735 | etmccr = etm_readl(drvdata, ETMCCR); | |
736 | drvdata->etmccr = etmccr; | |
737 | drvdata->nr_addr_cmp = BMVAL(etmccr, 0, 3) * 2; | |
738 | drvdata->nr_cntr = BMVAL(etmccr, 13, 15); | |
739 | drvdata->nr_ext_inp = BMVAL(etmccr, 17, 19); | |
740 | drvdata->nr_ext_out = BMVAL(etmccr, 20, 22); | |
741 | drvdata->nr_ctxid_cmp = BMVAL(etmccr, 24, 25); | |
742 | ||
743 | etm_set_pwrdwn(drvdata); | |
744 | etm_clr_pwrup(drvdata); | |
745 | CS_LOCK(drvdata->base); | |
746 | } | |
747 | ||
1925a470 MP |
748 | static void etm_init_trace_id(struct etm_drvdata *drvdata) |
749 | { | |
17534ceb | 750 | drvdata->traceid = coresight_get_trace_id(drvdata->cpu); |
a939fc5a PP |
751 | } |
752 | ||
753 | static int etm_probe(struct amba_device *adev, const struct amba_id *id) | |
754 | { | |
755 | int ret; | |
756 | void __iomem *base; | |
757 | struct device *dev = &adev->dev; | |
758 | struct coresight_platform_data *pdata = NULL; | |
759 | struct etm_drvdata *drvdata; | |
760 | struct resource *res = &adev->res; | |
9486295a | 761 | struct coresight_desc desc = { 0 }; |
a939fc5a PP |
762 | struct device_node *np = adev->dev.of_node; |
763 | ||
a939fc5a PP |
764 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
765 | if (!drvdata) | |
766 | return -ENOMEM; | |
767 | ||
768 | if (np) { | |
769 | pdata = of_get_coresight_platform_data(dev, np); | |
770 | if (IS_ERR(pdata)) | |
771 | return PTR_ERR(pdata); | |
772 | ||
773 | adev->dev.platform_data = pdata; | |
774 | drvdata->use_cp14 = of_property_read_bool(np, "arm,cp14"); | |
775 | } | |
776 | ||
777 | drvdata->dev = &adev->dev; | |
778 | dev_set_drvdata(dev, drvdata); | |
779 | ||
780 | /* Validity for the resource is already checked by the AMBA core */ | |
781 | base = devm_ioremap_resource(dev, res); | |
782 | if (IS_ERR(base)) | |
783 | return PTR_ERR(base); | |
784 | ||
785 | drvdata->base = base; | |
786 | ||
787 | spin_lock_init(&drvdata->spinlock); | |
788 | ||
d1839e68 LW |
789 | drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */ |
790 | if (!IS_ERR(drvdata->atclk)) { | |
791 | ret = clk_prepare_enable(drvdata->atclk); | |
792 | if (ret) | |
793 | return ret; | |
794 | } | |
795 | ||
a939fc5a PP |
796 | drvdata->cpu = pdata ? pdata->cpu : 0; |
797 | ||
798 | get_online_cpus(); | |
799 | etmdrvdata[drvdata->cpu] = drvdata; | |
800 | ||
a939fc5a PP |
801 | if (smp_call_function_single(drvdata->cpu, |
802 | etm_init_arch_data, drvdata, 1)) | |
803 | dev_err(dev, "ETM arch init failed\n"); | |
804 | ||
2b5283d1 RC |
805 | if (!etm_count++) { |
806 | cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING, | |
807 | "AP_ARM_CORESIGHT_STARTING", | |
808 | etm_starting_cpu, etm_dying_cpu); | |
809 | ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, | |
810 | "AP_ARM_CORESIGHT_ONLINE", | |
811 | etm_online_cpu, NULL); | |
812 | if (ret < 0) | |
813 | goto err_arch_supported; | |
814 | hp_online = ret; | |
815 | } | |
a939fc5a PP |
816 | put_online_cpus(); |
817 | ||
818 | if (etm_arch_supported(drvdata->arch) == false) { | |
819 | ret = -EINVAL; | |
820 | goto err_arch_supported; | |
821 | } | |
1925a470 MP |
822 | |
823 | etm_init_trace_id(drvdata); | |
c528a25a | 824 | etm_set_default(&drvdata->config); |
a939fc5a | 825 | |
9486295a SP |
826 | desc.type = CORESIGHT_DEV_TYPE_SOURCE; |
827 | desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC; | |
828 | desc.ops = &etm_cs_ops; | |
829 | desc.pdata = pdata; | |
830 | desc.dev = dev; | |
831 | desc.groups = coresight_etm_groups; | |
832 | drvdata->csdev = coresight_register(&desc); | |
a939fc5a PP |
833 | if (IS_ERR(drvdata->csdev)) { |
834 | ret = PTR_ERR(drvdata->csdev); | |
835 | goto err_arch_supported; | |
836 | } | |
837 | ||
0bcbf2e3 MP |
838 | ret = etm_perf_symlink(drvdata->csdev, true); |
839 | if (ret) { | |
840 | coresight_unregister(drvdata->csdev); | |
841 | goto err_arch_supported; | |
842 | } | |
843 | ||
ec360059 | 844 | pm_runtime_put(&adev->dev); |
1c65b388 | 845 | dev_info(dev, "%s initialized\n", (char *)id->data); |
a939fc5a PP |
846 | if (boot_enable) { |
847 | coresight_enable(drvdata->csdev); | |
848 | drvdata->boot_enable = true; | |
849 | } | |
850 | ||
851 | return 0; | |
852 | ||
853 | err_arch_supported: | |
2b5283d1 RC |
854 | if (--etm_count == 0) { |
855 | cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); | |
856 | if (hp_online) | |
857 | cpuhp_remove_state_nocalls(hp_online); | |
858 | } | |
a939fc5a PP |
859 | return ret; |
860 | } | |
861 | ||
d1839e68 LW |
862 | #ifdef CONFIG_PM |
863 | static int etm_runtime_suspend(struct device *dev) | |
864 | { | |
865 | struct etm_drvdata *drvdata = dev_get_drvdata(dev); | |
866 | ||
867 | if (drvdata && !IS_ERR(drvdata->atclk)) | |
868 | clk_disable_unprepare(drvdata->atclk); | |
869 | ||
870 | return 0; | |
871 | } | |
872 | ||
873 | static int etm_runtime_resume(struct device *dev) | |
874 | { | |
875 | struct etm_drvdata *drvdata = dev_get_drvdata(dev); | |
876 | ||
877 | if (drvdata && !IS_ERR(drvdata->atclk)) | |
878 | clk_prepare_enable(drvdata->atclk); | |
879 | ||
880 | return 0; | |
881 | } | |
882 | #endif | |
883 | ||
884 | static const struct dev_pm_ops etm_dev_pm_ops = { | |
885 | SET_RUNTIME_PM_OPS(etm_runtime_suspend, etm_runtime_resume, NULL) | |
886 | }; | |
887 | ||
a939fc5a PP |
888 | static struct amba_id etm_ids[] = { |
889 | { /* ETM 3.3 */ | |
890 | .id = 0x0003b921, | |
891 | .mask = 0x0003ffff, | |
1c65b388 | 892 | .data = "ETM 3.3", |
a939fc5a | 893 | }, |
2a18d726 OS |
894 | { /* ETM 3.5 - Cortex-A5 */ |
895 | .id = 0x0003b955, | |
896 | .mask = 0x0003ffff, | |
897 | .data = "ETM 3.5", | |
898 | }, | |
a939fc5a PP |
899 | { /* ETM 3.5 */ |
900 | .id = 0x0003b956, | |
901 | .mask = 0x0003ffff, | |
1c65b388 | 902 | .data = "ETM 3.5", |
a939fc5a PP |
903 | }, |
904 | { /* PTM 1.0 */ | |
905 | .id = 0x0003b950, | |
906 | .mask = 0x0003ffff, | |
1c65b388 | 907 | .data = "PTM 1.0", |
a939fc5a PP |
908 | }, |
909 | { /* PTM 1.1 */ | |
910 | .id = 0x0003b95f, | |
911 | .mask = 0x0003ffff, | |
1c65b388 | 912 | .data = "PTM 1.1", |
a939fc5a | 913 | }, |
27d3fd3d II |
914 | { /* PTM 1.1 Qualcomm */ |
915 | .id = 0x0003006f, | |
916 | .mask = 0x0003ffff, | |
917 | .data = "PTM 1.1", | |
918 | }, | |
a939fc5a PP |
919 | { 0, 0}, |
920 | }; | |
921 | ||
922 | static struct amba_driver etm_driver = { | |
923 | .drv = { | |
924 | .name = "coresight-etm3x", | |
925 | .owner = THIS_MODULE, | |
d1839e68 | 926 | .pm = &etm_dev_pm_ops, |
b15f0fb6 | 927 | .suppress_bind_attrs = true, |
a939fc5a PP |
928 | }, |
929 | .probe = etm_probe, | |
a939fc5a PP |
930 | .id_table = etm_ids, |
931 | }; | |
941943cf | 932 | builtin_amba_driver(etm_driver); |