1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
3 * Description: CoreSight Program Flow Trace driver
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.
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.
15 #include <linux/kernel.h>
16 #include <linux/moduleparam.h>
17 #include <linux/init.h>
18 #include <linux/types.h>
19 #include <linux/device.h>
21 #include <linux/err.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>
28 #include <linux/pm_runtime.h>
29 #include <linux/cpu.h>
31 #include <linux/coresight.h>
32 #include <linux/coresight-pmu.h>
33 #include <linux/amba/bus.h>
34 #include <linux/seq_file.h>
35 #include <linux/uaccess.h>
36 #include <linux/clk.h>
37 #include <linux/perf_event.h>
38 #include <asm/sections.h>
40 #include "coresight-etm.h"
41 #include "coresight-etm-perf.h"
44 * Not really modular but using module_param is the easiest way to
45 * remain consistent with existing use cases for now.
47 static int boot_enable;
48 module_param_named(boot_enable, boot_enable, int, S_IRUGO);
50 /* The number of ETM/PTM currently registered */
52 static struct etm_drvdata *etmdrvdata[NR_CPUS];
54 static enum cpuhp_state hp_online;
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.
61 static void etm_os_unlock(struct etm_drvdata *drvdata)
63 /* Writing any value to ETMOSLAR unlocks the trace registers */
64 etm_writel(drvdata, 0x0, ETMOSLAR);
65 drvdata->os_unlock = true;
69 static void etm_set_pwrdwn(struct etm_drvdata *drvdata)
73 /* Ensure pending cp14 accesses complete before setting pwrdwn */
76 etmcr = etm_readl(drvdata, ETMCR);
77 etmcr |= ETMCR_PWD_DWN;
78 etm_writel(drvdata, etmcr, ETMCR);
81 static void etm_clr_pwrdwn(struct etm_drvdata *drvdata)
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 */
93 static void etm_set_pwrup(struct etm_drvdata *drvdata)
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 */
105 static void etm_clr_pwrup(struct etm_drvdata *drvdata)
109 /* Ensure pending cp14 accesses complete before clearing pwrup */
112 etmpdcr = readl_relaxed(drvdata->base + ETMPDCR);
113 etmpdcr &= ~ETMPDCR_PWD_UP;
114 writel_relaxed(etmpdcr, drvdata->base + ETMPDCR);
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.
124 * Basically the same as @coresight_timeout except for the register access
125 * method where we have to account for CP14 configurations.
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.
131 static int coresight_timeout_etm(struct etm_drvdata *drvdata, u32 offset,
132 int position, int value)
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 */
141 if (val & BIT(position))
143 /* Waiting on the bit to go from 1 to 0 */
145 if (!(val & BIT(position)))
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.
162 static void etm_set_prog(struct etm_drvdata *drvdata)
166 etmcr = etm_readl(drvdata, ETMCR);
167 etmcr |= ETMCR_ETM_PRG;
168 etm_writel(drvdata, etmcr, ETMCR);
170 * Recommended by spec for cp14 accesses to ensure etmcr write is
171 * complete before polling etmsr
174 if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 1)) {
175 dev_err(drvdata->dev,
176 "%s: timeout observed when probing at offset %#x\n",
181 static void etm_clr_prog(struct etm_drvdata *drvdata)
185 etmcr = etm_readl(drvdata, ETMCR);
186 etmcr &= ~ETMCR_ETM_PRG;
187 etm_writel(drvdata, etmcr, ETMCR);
189 * Recommended by spec for cp14 accesses to ensure etmcr write is
190 * complete before polling etmsr
193 if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 0)) {
194 dev_err(drvdata->dev,
195 "%s: timeout observed when probing at offset %#x\n",
200 void etm_set_default(struct etm_config *config)
204 if (WARN_ON_ONCE(!config))
208 * Taken verbatim from the TRM:
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).
216 config->enable_ctrl1 = BIT(24);
217 config->enable_ctrl2 = 0x0;
218 config->enable_event = ETM_HARD_WIRE_RES_A;
220 config->trigger_event = ETM_DEFAULT_EVENT_VAL;
221 config->enable_event = ETM_HARD_WIRE_RES_A;
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;
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;
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;
245 config->ctxid_mask = 0x0;
246 /* Setting default to 1024 as per TRM recommendation */
247 config->sync_freq = 0x400;
250 void etm_config_trace_mode(struct etm_config *config)
256 mode &= (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER);
258 /* excluding kernel AND user space doesn't make sense */
259 if (mode == (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER))
262 /* nothing to do if neither flags are set */
263 if (!(mode & ETM_MODE_EXCL_KERN) && !(mode & ETM_MODE_EXCL_USER))
266 flags = (1 << 0 | /* instruction execute */
267 3 << 3 | /* ARM instruction */
268 0 << 5 | /* No data value comparison */
269 0 << 7 | /* No exact mach */
270 0 << 8); /* Ignore context ID */
272 /* No need to worry about single address comparators. */
273 config->enable_ctrl2 = 0x0;
275 /* Bit 0 is address range comparator 1 */
276 config->enable_ctrl1 = ETMTECR1_ADDR_COMP_1;
280 * ETMACTRn[13,11] == Non-secure state comparison control
281 * ETMACTRn[12,10] == Secure state comparison control
283 * b00 == Match in all modes in this state
284 * b01 == Do not match in any more in this state
285 * b10 == Match in all modes excepts user mode in this state
286 * b11 == Match only in user mode in this state
289 /* Tracing in secure mode is not supported at this time */
290 flags |= (0 << 12 | 1 << 10);
292 if (mode & ETM_MODE_EXCL_USER) {
293 /* exclude user, match all modes except user mode */
294 flags |= (1 << 13 | 0 << 11);
296 /* exclude kernel, match only in user mode */
297 flags |= (1 << 13 | 1 << 11);
301 * The ETMEEVR register is already set to "hard wire A". As such
302 * all there is to do is setup an address comparator that spans
303 * the entire address range and configure the state and mode bits.
305 config->addr_val[0] = (u32) 0x0;
306 config->addr_val[1] = (u32) ~0x0;
307 config->addr_acctype[0] = flags;
308 config->addr_acctype[1] = flags;
309 config->addr_type[0] = ETM_ADDR_TYPE_RANGE;
310 config->addr_type[1] = ETM_ADDR_TYPE_RANGE;
313 #define ETM3X_SUPPORTED_OPTIONS (ETMCR_CYC_ACC | \
314 ETMCR_TIMESTAMP_EN | \
317 static int etm_parse_event_config(struct etm_drvdata *drvdata,
318 struct perf_event *event)
320 struct etm_config *config = &drvdata->config;
321 struct perf_event_attr *attr = &event->attr;
326 /* Clear configuration from previous run */
327 memset(config, 0, sizeof(struct etm_config));
329 if (attr->exclude_kernel)
330 config->mode = ETM_MODE_EXCL_KERN;
332 if (attr->exclude_user)
333 config->mode = ETM_MODE_EXCL_USER;
335 /* Always start from the default config */
336 etm_set_default(config);
339 * By default the tracers are configured to trace the whole address
340 * range. Narrow the field only if requested by user space.
343 etm_config_trace_mode(config);
346 * At this time only cycle accurate, return stack and timestamp
347 * options are available.
349 if (attr->config & ~ETM3X_SUPPORTED_OPTIONS)
352 config->ctrl = attr->config;
355 * Possible to have cores with PTM (supports ret stack) and ETM
356 * (never has ret stack) on the same SoC. So if we have a request
357 * for return stack that can't be honoured on this core then
358 * clear the bit - trace will still continue normally
360 if ((config->ctrl & ETMCR_RETURN_STACK) &&
361 !(drvdata->etmccer & ETMCCER_RETSTACK))
362 config->ctrl &= ~ETMCR_RETURN_STACK;
367 static void etm_enable_hw(void *info)
371 struct etm_drvdata *drvdata = info;
372 struct etm_config *config = &drvdata->config;
374 CS_UNLOCK(drvdata->base);
377 etm_clr_pwrdwn(drvdata);
378 /* Apply power to trace registers */
379 etm_set_pwrup(drvdata);
380 /* Make sure all registers are accessible */
381 etm_os_unlock(drvdata);
383 etm_set_prog(drvdata);
385 etmcr = etm_readl(drvdata, ETMCR);
386 /* Clear setting from a previous run if need be */
387 etmcr &= ~ETM3X_SUPPORTED_OPTIONS;
388 etmcr |= drvdata->port_size;
389 etmcr |= ETMCR_ETM_EN;
390 etm_writel(drvdata, config->ctrl | etmcr, ETMCR);
391 etm_writel(drvdata, config->trigger_event, ETMTRIGGER);
392 etm_writel(drvdata, config->startstop_ctrl, ETMTSSCR);
393 etm_writel(drvdata, config->enable_event, ETMTEEVR);
394 etm_writel(drvdata, config->enable_ctrl1, ETMTECR1);
395 etm_writel(drvdata, config->fifofull_level, ETMFFLR);
396 for (i = 0; i < drvdata->nr_addr_cmp; i++) {
397 etm_writel(drvdata, config->addr_val[i], ETMACVRn(i));
398 etm_writel(drvdata, config->addr_acctype[i], ETMACTRn(i));
400 for (i = 0; i < drvdata->nr_cntr; i++) {
401 etm_writel(drvdata, config->cntr_rld_val[i], ETMCNTRLDVRn(i));
402 etm_writel(drvdata, config->cntr_event[i], ETMCNTENRn(i));
403 etm_writel(drvdata, config->cntr_rld_event[i],
405 etm_writel(drvdata, config->cntr_val[i], ETMCNTVRn(i));
407 etm_writel(drvdata, config->seq_12_event, ETMSQ12EVR);
408 etm_writel(drvdata, config->seq_21_event, ETMSQ21EVR);
409 etm_writel(drvdata, config->seq_23_event, ETMSQ23EVR);
410 etm_writel(drvdata, config->seq_31_event, ETMSQ31EVR);
411 etm_writel(drvdata, config->seq_32_event, ETMSQ32EVR);
412 etm_writel(drvdata, config->seq_13_event, ETMSQ13EVR);
413 etm_writel(drvdata, config->seq_curr_state, ETMSQR);
414 for (i = 0; i < drvdata->nr_ext_out; i++)
415 etm_writel(drvdata, ETM_DEFAULT_EVENT_VAL, ETMEXTOUTEVRn(i));
416 for (i = 0; i < drvdata->nr_ctxid_cmp; i++)
417 etm_writel(drvdata, config->ctxid_pid[i], ETMCIDCVRn(i));
418 etm_writel(drvdata, config->ctxid_mask, ETMCIDCMR);
419 etm_writel(drvdata, config->sync_freq, ETMSYNCFR);
420 /* No external input selected */
421 etm_writel(drvdata, 0x0, ETMEXTINSELR);
422 etm_writel(drvdata, config->timestamp_event, ETMTSEVR);
423 /* No auxiliary control selected */
424 etm_writel(drvdata, 0x0, ETMAUXCR);
425 etm_writel(drvdata, drvdata->traceid, ETMTRACEIDR);
426 /* No VMID comparator value selected */
427 etm_writel(drvdata, 0x0, ETMVMIDCVR);
429 etm_clr_prog(drvdata);
430 CS_LOCK(drvdata->base);
432 dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);
435 static int etm_cpu_id(struct coresight_device *csdev)
437 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
442 int etm_get_trace_id(struct etm_drvdata *drvdata)
450 if (!local_read(&drvdata->mode))
451 return drvdata->traceid;
453 pm_runtime_get_sync(drvdata->dev);
455 spin_lock_irqsave(&drvdata->spinlock, flags);
457 CS_UNLOCK(drvdata->base);
458 trace_id = (etm_readl(drvdata, ETMTRACEIDR) & ETM_TRACEID_MASK);
459 CS_LOCK(drvdata->base);
461 spin_unlock_irqrestore(&drvdata->spinlock, flags);
462 pm_runtime_put(drvdata->dev);
469 static int etm_trace_id(struct coresight_device *csdev)
471 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
473 return etm_get_trace_id(drvdata);
476 static int etm_enable_perf(struct coresight_device *csdev,
477 struct perf_event *event)
479 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
481 if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
484 /* Configure the tracer based on the session's specifics */
485 etm_parse_event_config(drvdata, event);
487 etm_enable_hw(drvdata);
492 static int etm_enable_sysfs(struct coresight_device *csdev)
494 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
497 spin_lock(&drvdata->spinlock);
500 * Configure the ETM only if the CPU is online. If it isn't online
501 * hw configuration will take place on the local CPU during bring up.
503 if (cpu_online(drvdata->cpu)) {
504 ret = smp_call_function_single(drvdata->cpu,
505 etm_enable_hw, drvdata, 1);
510 drvdata->sticky_enable = true;
511 spin_unlock(&drvdata->spinlock);
513 dev_info(drvdata->dev, "ETM tracing enabled\n");
517 spin_unlock(&drvdata->spinlock);
521 static int etm_enable(struct coresight_device *csdev,
522 struct perf_event *event, u32 mode)
526 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
528 val = local_cmpxchg(&drvdata->mode, CS_MODE_DISABLED, mode);
530 /* Someone is already using the tracer */
536 ret = etm_enable_sysfs(csdev);
539 ret = etm_enable_perf(csdev, event);
545 /* The tracer didn't start */
547 local_set(&drvdata->mode, CS_MODE_DISABLED);
552 static void etm_disable_hw(void *info)
555 struct etm_drvdata *drvdata = info;
556 struct etm_config *config = &drvdata->config;
558 CS_UNLOCK(drvdata->base);
559 etm_set_prog(drvdata);
561 /* Read back sequencer and counters for post trace analysis */
562 config->seq_curr_state = (etm_readl(drvdata, ETMSQR) & ETM_SQR_MASK);
564 for (i = 0; i < drvdata->nr_cntr; i++)
565 config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i));
567 etm_set_pwrdwn(drvdata);
568 CS_LOCK(drvdata->base);
570 dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu);
573 static void etm_disable_perf(struct coresight_device *csdev)
575 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
577 if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
580 CS_UNLOCK(drvdata->base);
582 /* Setting the prog bit disables tracing immediately */
583 etm_set_prog(drvdata);
586 * There is no way to know when the tracer will be used again so
587 * power down the tracer.
589 etm_set_pwrdwn(drvdata);
591 CS_LOCK(drvdata->base);
594 static void etm_disable_sysfs(struct coresight_device *csdev)
596 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
599 * Taking hotplug lock here protects from clocks getting disabled
600 * with tracing being left on (crash scenario) if user disable occurs
601 * after cpu online mask indicates the cpu is offline but before the
602 * DYING hotplug callback is serviced by the ETM driver.
605 spin_lock(&drvdata->spinlock);
608 * Executing etm_disable_hw on the cpu whose ETM is being disabled
609 * ensures that register writes occur when cpu is powered.
611 smp_call_function_single(drvdata->cpu, etm_disable_hw, drvdata, 1);
613 spin_unlock(&drvdata->spinlock);
616 dev_info(drvdata->dev, "ETM tracing disabled\n");
619 static void etm_disable(struct coresight_device *csdev,
620 struct perf_event *event)
623 struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
626 * For as long as the tracer isn't disabled another entity can't
627 * change its status. As such we can read the status here without
628 * fearing it will change under us.
630 mode = local_read(&drvdata->mode);
633 case CS_MODE_DISABLED:
636 etm_disable_sysfs(csdev);
639 etm_disable_perf(csdev);
647 local_set(&drvdata->mode, CS_MODE_DISABLED);
650 static const struct coresight_ops_source etm_source_ops = {
651 .cpu_id = etm_cpu_id,
652 .trace_id = etm_trace_id,
653 .enable = etm_enable,
654 .disable = etm_disable,
657 static const struct coresight_ops etm_cs_ops = {
658 .source_ops = &etm_source_ops,
661 static int etm_online_cpu(unsigned int cpu)
663 if (!etmdrvdata[cpu])
666 if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable)
667 coresight_enable(etmdrvdata[cpu]->csdev);
671 static int etm_starting_cpu(unsigned int cpu)
673 if (!etmdrvdata[cpu])
676 spin_lock(&etmdrvdata[cpu]->spinlock);
677 if (!etmdrvdata[cpu]->os_unlock) {
678 etm_os_unlock(etmdrvdata[cpu]);
679 etmdrvdata[cpu]->os_unlock = true;
682 if (local_read(&etmdrvdata[cpu]->mode))
683 etm_enable_hw(etmdrvdata[cpu]);
684 spin_unlock(&etmdrvdata[cpu]->spinlock);
688 static int etm_dying_cpu(unsigned int cpu)
690 if (!etmdrvdata[cpu])
693 spin_lock(&etmdrvdata[cpu]->spinlock);
694 if (local_read(&etmdrvdata[cpu]->mode))
695 etm_disable_hw(etmdrvdata[cpu]);
696 spin_unlock(&etmdrvdata[cpu]->spinlock);
700 static bool etm_arch_supported(u8 arch)
717 static void etm_init_arch_data(void *info)
721 struct etm_drvdata *drvdata = info;
723 /* Make sure all registers are accessible */
724 etm_os_unlock(drvdata);
726 CS_UNLOCK(drvdata->base);
728 /* First dummy read */
729 (void)etm_readl(drvdata, ETMPDSR);
730 /* Provide power to ETM: ETMPDCR[3] == 1 */
731 etm_set_pwrup(drvdata);
733 * Clear power down bit since when this bit is set writes to
734 * certain registers might be ignored.
736 etm_clr_pwrdwn(drvdata);
738 * Set prog bit. It will be set from reset but this is included to
741 etm_set_prog(drvdata);
743 /* Find all capabilities */
744 etmidr = etm_readl(drvdata, ETMIDR);
745 drvdata->arch = BMVAL(etmidr, 4, 11);
746 drvdata->port_size = etm_readl(drvdata, ETMCR) & PORT_SIZE_MASK;
748 drvdata->etmccer = etm_readl(drvdata, ETMCCER);
749 etmccr = etm_readl(drvdata, ETMCCR);
750 drvdata->etmccr = etmccr;
751 drvdata->nr_addr_cmp = BMVAL(etmccr, 0, 3) * 2;
752 drvdata->nr_cntr = BMVAL(etmccr, 13, 15);
753 drvdata->nr_ext_inp = BMVAL(etmccr, 17, 19);
754 drvdata->nr_ext_out = BMVAL(etmccr, 20, 22);
755 drvdata->nr_ctxid_cmp = BMVAL(etmccr, 24, 25);
757 etm_set_pwrdwn(drvdata);
758 etm_clr_pwrup(drvdata);
759 CS_LOCK(drvdata->base);
762 static void etm_init_trace_id(struct etm_drvdata *drvdata)
764 drvdata->traceid = coresight_get_trace_id(drvdata->cpu);
767 static int etm_probe(struct amba_device *adev, const struct amba_id *id)
771 struct device *dev = &adev->dev;
772 struct coresight_platform_data *pdata = NULL;
773 struct etm_drvdata *drvdata;
774 struct resource *res = &adev->res;
775 struct coresight_desc desc = { 0 };
776 struct device_node *np = adev->dev.of_node;
778 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
783 pdata = of_get_coresight_platform_data(dev, np);
785 return PTR_ERR(pdata);
787 adev->dev.platform_data = pdata;
788 drvdata->use_cp14 = of_property_read_bool(np, "arm,cp14");
791 drvdata->dev = &adev->dev;
792 dev_set_drvdata(dev, drvdata);
794 /* Validity for the resource is already checked by the AMBA core */
795 base = devm_ioremap_resource(dev, res);
797 return PTR_ERR(base);
799 drvdata->base = base;
801 spin_lock_init(&drvdata->spinlock);
803 drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
804 if (!IS_ERR(drvdata->atclk)) {
805 ret = clk_prepare_enable(drvdata->atclk);
810 drvdata->cpu = pdata ? pdata->cpu : 0;
813 etmdrvdata[drvdata->cpu] = drvdata;
815 if (smp_call_function_single(drvdata->cpu,
816 etm_init_arch_data, drvdata, 1))
817 dev_err(dev, "ETM arch init failed\n");
820 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING,
821 "arm/coresight:starting",
822 etm_starting_cpu, etm_dying_cpu);
823 ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
824 "arm/coresight:online",
825 etm_online_cpu, NULL);
827 goto err_arch_supported;
832 if (etm_arch_supported(drvdata->arch) == false) {
834 goto err_arch_supported;
837 etm_init_trace_id(drvdata);
838 etm_set_default(&drvdata->config);
840 desc.type = CORESIGHT_DEV_TYPE_SOURCE;
841 desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
842 desc.ops = &etm_cs_ops;
845 desc.groups = coresight_etm_groups;
846 drvdata->csdev = coresight_register(&desc);
847 if (IS_ERR(drvdata->csdev)) {
848 ret = PTR_ERR(drvdata->csdev);
849 goto err_arch_supported;
852 ret = etm_perf_symlink(drvdata->csdev, true);
854 coresight_unregister(drvdata->csdev);
855 goto err_arch_supported;
858 pm_runtime_put(&adev->dev);
859 dev_info(dev, "%s initialized\n", (char *)id->data);
861 coresight_enable(drvdata->csdev);
862 drvdata->boot_enable = true;
868 if (--etm_count == 0) {
869 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING);
871 cpuhp_remove_state_nocalls(hp_online);
877 static int etm_runtime_suspend(struct device *dev)
879 struct etm_drvdata *drvdata = dev_get_drvdata(dev);
881 if (drvdata && !IS_ERR(drvdata->atclk))
882 clk_disable_unprepare(drvdata->atclk);
887 static int etm_runtime_resume(struct device *dev)
889 struct etm_drvdata *drvdata = dev_get_drvdata(dev);
891 if (drvdata && !IS_ERR(drvdata->atclk))
892 clk_prepare_enable(drvdata->atclk);
898 static const struct dev_pm_ops etm_dev_pm_ops = {
899 SET_RUNTIME_PM_OPS(etm_runtime_suspend, etm_runtime_resume, NULL)
902 static const struct amba_id etm_ids[] = {
908 { /* ETM 3.5 - Cortex-A5 */
928 { /* PTM 1.1 Qualcomm */
936 static struct amba_driver etm_driver = {
938 .name = "coresight-etm3x",
939 .owner = THIS_MODULE,
940 .pm = &etm_dev_pm_ops,
941 .suppress_bind_attrs = true,
946 builtin_amba_driver(etm_driver);