1 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/types.h>
16 #include <linux/device.h>
18 #include <linux/err.h>
19 #include <linux/export.h>
20 #include <linux/slab.h>
21 #include <linux/mutex.h>
22 #include <linux/clk.h>
23 #include <linux/coresight.h>
24 #include <linux/of_platform.h>
25 #include <linux/delay.h>
26 #include <linux/pm_runtime.h>
28 #include "coresight-priv.h"
30 static DEFINE_MUTEX(coresight_mutex);
33 * struct coresight_node - elements of a path, from source to sink
34 * @csdev: Address of an element.
35 * @link: hook to the list.
37 struct coresight_node {
38 struct coresight_device *csdev;
39 struct list_head link;
43 * When operating Coresight drivers from the sysFS interface, only a single
44 * path can exist from a tracer (associated to a CPU) to a sink.
46 static DEFINE_PER_CPU(struct list_head *, tracer_path);
49 * As of this writing only a single STM can be found in CS topologies. Since
50 * there is no way to know if we'll ever see more and what kind of
51 * configuration they will enact, for the time being only define a single path
54 static struct list_head *stm_path;
57 * When losing synchronisation a new barrier packet needs to be inserted at the
58 * beginning of the data collected in a buffer. That way the decoder knows that
59 * it needs to look for another sync sequence.
61 const u32 barrier_pkt[5] = {0x7fffffff, 0x7fffffff,
62 0x7fffffff, 0x7fffffff, 0x0};
64 static int coresight_id_match(struct device *dev, void *data)
66 int trace_id, i_trace_id;
67 struct coresight_device *csdev, *i_csdev;
70 i_csdev = to_coresight_device(dev);
73 * No need to care about oneself and components that are not
74 * sources or not enabled
76 if (i_csdev == csdev || !i_csdev->enable ||
77 i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
80 /* Get the source ID for both compoment */
81 trace_id = source_ops(csdev)->trace_id(csdev);
82 i_trace_id = source_ops(i_csdev)->trace_id(i_csdev);
84 /* All you need is one */
85 if (trace_id == i_trace_id)
91 static int coresight_source_is_unique(struct coresight_device *csdev)
93 int trace_id = source_ops(csdev)->trace_id(csdev);
95 /* this shouldn't happen */
99 return !bus_for_each_dev(&coresight_bustype, NULL,
100 csdev, coresight_id_match);
103 static int coresight_find_link_inport(struct coresight_device *csdev,
104 struct coresight_device *parent)
107 struct coresight_connection *conn;
109 for (i = 0; i < parent->nr_outport; i++) {
110 conn = &parent->conns[i];
111 if (conn->child_dev == csdev)
112 return conn->child_port;
115 dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
116 dev_name(&parent->dev), dev_name(&csdev->dev));
121 static int coresight_find_link_outport(struct coresight_device *csdev,
122 struct coresight_device *child)
125 struct coresight_connection *conn;
127 for (i = 0; i < csdev->nr_outport; i++) {
128 conn = &csdev->conns[i];
129 if (conn->child_dev == child)
130 return conn->outport;
133 dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
134 dev_name(&csdev->dev), dev_name(&child->dev));
139 static int coresight_enable_sink(struct coresight_device *csdev, u32 mode)
143 if (!csdev->enable) {
144 if (sink_ops(csdev)->enable) {
145 ret = sink_ops(csdev)->enable(csdev, mode);
149 csdev->enable = true;
152 atomic_inc(csdev->refcnt);
157 static void coresight_disable_sink(struct coresight_device *csdev)
159 if (atomic_dec_return(csdev->refcnt) == 0) {
160 if (sink_ops(csdev)->disable) {
161 sink_ops(csdev)->disable(csdev);
162 csdev->enable = false;
167 static int coresight_enable_link(struct coresight_device *csdev,
168 struct coresight_device *parent,
169 struct coresight_device *child)
173 int refport, inport, outport;
175 if (!parent || !child)
178 inport = coresight_find_link_inport(csdev, parent);
179 outport = coresight_find_link_outport(csdev, child);
180 link_subtype = csdev->subtype.link_subtype;
182 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
184 else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
189 if (atomic_inc_return(&csdev->refcnt[refport]) == 1) {
190 if (link_ops(csdev)->enable) {
191 ret = link_ops(csdev)->enable(csdev, inport, outport);
197 csdev->enable = true;
202 static void coresight_disable_link(struct coresight_device *csdev,
203 struct coresight_device *parent,
204 struct coresight_device *child)
208 int refport, inport, outport;
210 if (!parent || !child)
213 inport = coresight_find_link_inport(csdev, parent);
214 outport = coresight_find_link_outport(csdev, child);
215 link_subtype = csdev->subtype.link_subtype;
217 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
219 nr_conns = csdev->nr_inport;
220 } else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
222 nr_conns = csdev->nr_outport;
228 if (atomic_dec_return(&csdev->refcnt[refport]) == 0) {
229 if (link_ops(csdev)->disable)
230 link_ops(csdev)->disable(csdev, inport, outport);
233 for (i = 0; i < nr_conns; i++)
234 if (atomic_read(&csdev->refcnt[i]) != 0)
237 csdev->enable = false;
240 static int coresight_enable_source(struct coresight_device *csdev, u32 mode)
244 if (!coresight_source_is_unique(csdev)) {
245 dev_warn(&csdev->dev, "traceID %d not unique\n",
246 source_ops(csdev)->trace_id(csdev));
250 if (!csdev->enable) {
251 if (source_ops(csdev)->enable) {
252 ret = source_ops(csdev)->enable(csdev, NULL, mode);
256 csdev->enable = true;
259 atomic_inc(csdev->refcnt);
265 * coresight_disable_source - Drop the reference count by 1 and disable
266 * the device if there are no users left.
268 * @csdev - The coresight device to disable
270 * Returns true if the device has been disabled.
272 static bool coresight_disable_source(struct coresight_device *csdev)
274 if (atomic_dec_return(csdev->refcnt) == 0) {
275 if (source_ops(csdev)->disable)
276 source_ops(csdev)->disable(csdev, NULL);
277 csdev->enable = false;
279 return !csdev->enable;
282 void coresight_disable_path(struct list_head *path)
285 struct coresight_node *nd;
286 struct coresight_device *csdev, *parent, *child;
288 list_for_each_entry(nd, path, link) {
293 * ETF devices are tricky... They can be a link or a sink,
294 * depending on how they are configured. If an ETF has been
295 * "activated" it will be configured as a sink, otherwise
296 * go ahead with the link configuration.
298 if (type == CORESIGHT_DEV_TYPE_LINKSINK)
299 type = (csdev == coresight_get_sink(path)) ?
300 CORESIGHT_DEV_TYPE_SINK :
301 CORESIGHT_DEV_TYPE_LINK;
304 case CORESIGHT_DEV_TYPE_SINK:
305 coresight_disable_sink(csdev);
307 case CORESIGHT_DEV_TYPE_SOURCE:
308 /* sources are disabled from either sysFS or Perf */
310 case CORESIGHT_DEV_TYPE_LINK:
311 parent = list_prev_entry(nd, link)->csdev;
312 child = list_next_entry(nd, link)->csdev;
313 coresight_disable_link(csdev, parent, child);
321 int coresight_enable_path(struct list_head *path, u32 mode)
326 struct coresight_node *nd;
327 struct coresight_device *csdev, *parent, *child;
329 list_for_each_entry_reverse(nd, path, link) {
334 * ETF devices are tricky... They can be a link or a sink,
335 * depending on how they are configured. If an ETF has been
336 * "activated" it will be configured as a sink, otherwise
337 * go ahead with the link configuration.
339 if (type == CORESIGHT_DEV_TYPE_LINKSINK)
340 type = (csdev == coresight_get_sink(path)) ?
341 CORESIGHT_DEV_TYPE_SINK :
342 CORESIGHT_DEV_TYPE_LINK;
345 case CORESIGHT_DEV_TYPE_SINK:
346 ret = coresight_enable_sink(csdev, mode);
350 case CORESIGHT_DEV_TYPE_SOURCE:
351 /* sources are enabled from either sysFS or Perf */
353 case CORESIGHT_DEV_TYPE_LINK:
354 parent = list_prev_entry(nd, link)->csdev;
355 child = list_next_entry(nd, link)->csdev;
356 ret = coresight_enable_link(csdev, parent, child);
368 coresight_disable_path(path);
372 struct coresight_device *coresight_get_sink(struct list_head *path)
374 struct coresight_device *csdev;
379 csdev = list_last_entry(path, struct coresight_node, link)->csdev;
380 if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
381 csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
387 static int coresight_enabled_sink(struct device *dev, void *data)
390 struct coresight_device *csdev = to_coresight_device(dev);
392 if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
393 csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
396 * Now that we have a handle on the sink for this session,
397 * disable the sysFS "enable_sink" flag so that possible
398 * concurrent perf session that wish to use another sink don't
399 * trip on it. Doing so has no ramification for the current
403 csdev->activated = false;
412 * coresight_get_enabled_sink - returns the first enabled sink found on the bus
413 * @deactivate: Whether the 'enable_sink' flag should be reset
415 * When operated from perf the deactivate parameter should be set to 'true'.
416 * That way the "enabled_sink" flag of the sink that was selected can be reset,
417 * allowing for other concurrent perf sessions to choose a different sink.
419 * When operated from sysFS users have full control and as such the deactivate
420 * parameter should be set to 'false', hence mandating users to explicitly
423 struct coresight_device *coresight_get_enabled_sink(bool deactivate)
425 struct device *dev = NULL;
427 dev = bus_find_device(&coresight_bustype, NULL, &deactivate,
428 coresight_enabled_sink);
430 return dev ? to_coresight_device(dev) : NULL;
434 * _coresight_build_path - recursively build a path from a @csdev to a sink.
435 * @csdev: The device to start from.
436 * @path: The list to add devices to.
438 * The tree of Coresight device is traversed until an activated sink is
439 * found. From there the sink is added to the list along with all the
440 * devices that led to that point - the end result is a list from source
441 * to sink. In that list the source is the first device and the sink the
444 static int _coresight_build_path(struct coresight_device *csdev,
445 struct coresight_device *sink,
446 struct list_head *path)
450 struct coresight_node *node;
452 /* An activated sink has been found. Enqueue the element */
456 /* Not a sink - recursively explore each port found on this element */
457 for (i = 0; i < csdev->nr_outport; i++) {
458 struct coresight_device *child_dev = csdev->conns[i].child_dev;
461 _coresight_build_path(child_dev, sink, path) == 0) {
472 * A path from this element to a sink has been found. The elements
473 * leading to the sink are already enqueued, all that is left to do
474 * is tell the PM runtime core we need this element and add a node
477 node = kzalloc(sizeof(struct coresight_node), GFP_KERNEL);
482 list_add(&node->link, path);
483 pm_runtime_get_sync(csdev->dev.parent);
488 struct list_head *coresight_build_path(struct coresight_device *source,
489 struct coresight_device *sink)
491 struct list_head *path;
495 return ERR_PTR(-EINVAL);
497 path = kzalloc(sizeof(struct list_head), GFP_KERNEL);
499 return ERR_PTR(-ENOMEM);
501 INIT_LIST_HEAD(path);
503 rc = _coresight_build_path(source, sink, path);
513 * coresight_release_path - release a previously built path.
514 * @path: the path to release.
516 * Go through all the elements of a path and 1) removed it from the list and
517 * 2) free the memory allocated for each node.
519 void coresight_release_path(struct list_head *path)
521 struct coresight_device *csdev;
522 struct coresight_node *nd, *next;
524 list_for_each_entry_safe(nd, next, path, link) {
527 pm_runtime_put_sync(csdev->dev.parent);
536 /** coresight_validate_source - make sure a source has the right credentials
537 * @csdev: the device structure for a source.
538 * @function: the function this was called from.
540 * Assumes the coresight_mutex is held.
542 static int coresight_validate_source(struct coresight_device *csdev,
543 const char *function)
548 subtype = csdev->subtype.source_subtype;
550 if (type != CORESIGHT_DEV_TYPE_SOURCE) {
551 dev_err(&csdev->dev, "wrong device type in %s\n", function);
555 if (subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_PROC &&
556 subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE) {
557 dev_err(&csdev->dev, "wrong device subtype in %s\n", function);
564 int coresight_enable(struct coresight_device *csdev)
567 struct coresight_device *sink;
568 struct list_head *path;
569 enum coresight_dev_subtype_source subtype;
571 subtype = csdev->subtype.source_subtype;
573 mutex_lock(&coresight_mutex);
575 ret = coresight_validate_source(csdev, __func__);
581 * There could be multiple applications driving the software
582 * source. So keep the refcount for each such user when the
583 * source is already enabled.
585 if (subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE)
586 atomic_inc(csdev->refcnt);
591 * Search for a valid sink for this session but don't reset the
592 * "enable_sink" flag in sysFS. Users get to do that explicitly.
594 sink = coresight_get_enabled_sink(false);
600 path = coresight_build_path(csdev, sink);
602 pr_err("building path(s) failed\n");
607 ret = coresight_enable_path(path, CS_MODE_SYSFS);
611 ret = coresight_enable_source(csdev, CS_MODE_SYSFS);
616 case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
618 * When working from sysFS it is important to keep track
619 * of the paths that were created so that they can be
620 * undone in 'coresight_disable()'. Since there can only
621 * be a single session per tracer (when working from sysFS)
622 * a per-cpu variable will do just fine.
624 cpu = source_ops(csdev)->cpu_id(csdev);
625 per_cpu(tracer_path, cpu) = path;
627 case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
631 /* We can't be here */
636 mutex_unlock(&coresight_mutex);
640 coresight_disable_path(path);
643 coresight_release_path(path);
646 EXPORT_SYMBOL_GPL(coresight_enable);
648 void coresight_disable(struct coresight_device *csdev)
651 struct list_head *path = NULL;
653 mutex_lock(&coresight_mutex);
655 ret = coresight_validate_source(csdev, __func__);
659 if (!csdev->enable || !coresight_disable_source(csdev))
662 switch (csdev->subtype.source_subtype) {
663 case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
664 cpu = source_ops(csdev)->cpu_id(csdev);
665 path = per_cpu(tracer_path, cpu);
666 per_cpu(tracer_path, cpu) = NULL;
668 case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
673 /* We can't be here */
677 coresight_disable_path(path);
678 coresight_release_path(path);
681 mutex_unlock(&coresight_mutex);
683 EXPORT_SYMBOL_GPL(coresight_disable);
685 static ssize_t enable_sink_show(struct device *dev,
686 struct device_attribute *attr, char *buf)
688 struct coresight_device *csdev = to_coresight_device(dev);
690 return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->activated);
693 static ssize_t enable_sink_store(struct device *dev,
694 struct device_attribute *attr,
695 const char *buf, size_t size)
699 struct coresight_device *csdev = to_coresight_device(dev);
701 ret = kstrtoul(buf, 10, &val);
706 csdev->activated = true;
708 csdev->activated = false;
713 static DEVICE_ATTR_RW(enable_sink);
715 static ssize_t enable_source_show(struct device *dev,
716 struct device_attribute *attr, char *buf)
718 struct coresight_device *csdev = to_coresight_device(dev);
720 return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->enable);
723 static ssize_t enable_source_store(struct device *dev,
724 struct device_attribute *attr,
725 const char *buf, size_t size)
729 struct coresight_device *csdev = to_coresight_device(dev);
731 ret = kstrtoul(buf, 10, &val);
736 ret = coresight_enable(csdev);
740 coresight_disable(csdev);
745 static DEVICE_ATTR_RW(enable_source);
747 static struct attribute *coresight_sink_attrs[] = {
748 &dev_attr_enable_sink.attr,
751 ATTRIBUTE_GROUPS(coresight_sink);
753 static struct attribute *coresight_source_attrs[] = {
754 &dev_attr_enable_source.attr,
757 ATTRIBUTE_GROUPS(coresight_source);
759 static struct device_type coresight_dev_type[] = {
765 .groups = coresight_sink_groups,
772 .groups = coresight_sink_groups,
776 .groups = coresight_source_groups,
780 static void coresight_device_release(struct device *dev)
782 struct coresight_device *csdev = to_coresight_device(dev);
785 kfree(csdev->refcnt);
789 static int coresight_orphan_match(struct device *dev, void *data)
792 bool still_orphan = false;
793 struct coresight_device *csdev, *i_csdev;
794 struct coresight_connection *conn;
797 i_csdev = to_coresight_device(dev);
799 /* No need to check oneself */
800 if (csdev == i_csdev)
803 /* Move on to another component if no connection is orphan */
804 if (!i_csdev->orphan)
807 * Circle throuch all the connection of that component. If we find
808 * an orphan connection whose name matches @csdev, link it.
810 for (i = 0; i < i_csdev->nr_outport; i++) {
811 conn = &i_csdev->conns[i];
813 /* We have found at least one orphan connection */
814 if (conn->child_dev == NULL) {
815 /* Does it match this newly added device? */
816 if (conn->child_name &&
817 !strcmp(dev_name(&csdev->dev), conn->child_name)) {
818 conn->child_dev = csdev;
820 /* This component still has an orphan */
826 i_csdev->orphan = still_orphan;
829 * Returning '0' ensures that all known component on the
830 * bus will be checked.
835 static void coresight_fixup_orphan_conns(struct coresight_device *csdev)
838 * No need to check for a return value as orphan connection(s)
839 * are hooked-up with each newly added component.
841 bus_for_each_dev(&coresight_bustype, NULL,
842 csdev, coresight_orphan_match);
846 static int coresight_name_match(struct device *dev, void *data)
849 struct coresight_device *i_csdev;
852 i_csdev = to_coresight_device(dev);
854 if (to_match && !strcmp(to_match, dev_name(&i_csdev->dev)))
860 static void coresight_fixup_device_conns(struct coresight_device *csdev)
863 struct device *dev = NULL;
864 struct coresight_connection *conn;
866 for (i = 0; i < csdev->nr_outport; i++) {
867 conn = &csdev->conns[i];
868 dev = bus_find_device(&coresight_bustype, NULL,
869 (void *)conn->child_name,
870 coresight_name_match);
873 conn->child_dev = to_coresight_device(dev);
874 /* and put reference from 'bus_find_device()' */
877 csdev->orphan = true;
878 conn->child_dev = NULL;
883 static int coresight_remove_match(struct device *dev, void *data)
886 struct coresight_device *csdev, *iterator;
887 struct coresight_connection *conn;
890 iterator = to_coresight_device(dev);
892 /* No need to check oneself */
893 if (csdev == iterator)
897 * Circle throuch all the connection of that component. If we find
898 * a connection whose name matches @csdev, remove it.
900 for (i = 0; i < iterator->nr_outport; i++) {
901 conn = &iterator->conns[i];
903 if (conn->child_dev == NULL)
906 if (!strcmp(dev_name(&csdev->dev), conn->child_name)) {
907 iterator->orphan = true;
908 conn->child_dev = NULL;
909 /* No need to continue */
915 * Returning '0' ensures that all known component on the
916 * bus will be checked.
921 static void coresight_remove_conns(struct coresight_device *csdev)
923 bus_for_each_dev(&coresight_bustype, NULL,
924 csdev, coresight_remove_match);
928 * coresight_timeout - loop until a bit has changed to a specific state.
929 * @addr: base address of the area of interest.
930 * @offset: address of a register, starting from @addr.
931 * @position: the position of the bit of interest.
932 * @value: the value the bit should have.
934 * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
935 * TIMEOUT_US has elapsed, which ever happens first.
938 int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
943 for (i = TIMEOUT_US; i > 0; i--) {
944 val = __raw_readl(addr + offset);
945 /* waiting on the bit to go from 0 to 1 */
947 if (val & BIT(position))
949 /* waiting on the bit to go from 1 to 0 */
951 if (!(val & BIT(position)))
956 * Delay is arbitrary - the specification doesn't say how long
957 * we are expected to wait. Extra check required to make sure
958 * we don't wait needlessly on the last iteration.
967 struct bus_type coresight_bustype = {
971 static int __init coresight_init(void)
973 return bus_register(&coresight_bustype);
975 postcore_initcall(coresight_init);
977 struct coresight_device *coresight_register(struct coresight_desc *desc)
983 atomic_t *refcnts = NULL;
984 struct coresight_device *csdev;
985 struct coresight_connection *conns = NULL;
987 csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
990 goto err_kzalloc_csdev;
993 if (desc->type == CORESIGHT_DEV_TYPE_LINK ||
994 desc->type == CORESIGHT_DEV_TYPE_LINKSINK) {
995 link_subtype = desc->subtype.link_subtype;
997 if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
998 nr_refcnts = desc->pdata->nr_inport;
999 else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
1000 nr_refcnts = desc->pdata->nr_outport;
1003 refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
1006 goto err_kzalloc_refcnts;
1009 csdev->refcnt = refcnts;
1011 csdev->nr_inport = desc->pdata->nr_inport;
1012 csdev->nr_outport = desc->pdata->nr_outport;
1014 /* Initialise connections if there is at least one outport */
1015 if (csdev->nr_outport) {
1016 conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
1019 goto err_kzalloc_conns;
1022 for (i = 0; i < csdev->nr_outport; i++) {
1023 conns[i].outport = desc->pdata->outports[i];
1024 conns[i].child_name = desc->pdata->child_names[i];
1025 conns[i].child_port = desc->pdata->child_ports[i];
1029 csdev->conns = conns;
1031 csdev->type = desc->type;
1032 csdev->subtype = desc->subtype;
1033 csdev->ops = desc->ops;
1034 csdev->orphan = false;
1036 csdev->dev.type = &coresight_dev_type[desc->type];
1037 csdev->dev.groups = desc->groups;
1038 csdev->dev.parent = desc->dev;
1039 csdev->dev.release = coresight_device_release;
1040 csdev->dev.bus = &coresight_bustype;
1041 dev_set_name(&csdev->dev, "%s", desc->pdata->name);
1043 ret = device_register(&csdev->dev);
1045 goto err_device_register;
1047 mutex_lock(&coresight_mutex);
1049 coresight_fixup_device_conns(csdev);
1050 coresight_fixup_orphan_conns(csdev);
1052 mutex_unlock(&coresight_mutex);
1056 err_device_register:
1060 err_kzalloc_refcnts:
1063 return ERR_PTR(ret);
1065 EXPORT_SYMBOL_GPL(coresight_register);
1067 void coresight_unregister(struct coresight_device *csdev)
1069 /* Remove references of that device in the topology */
1070 coresight_remove_conns(csdev);
1071 device_unregister(&csdev->dev);
1073 EXPORT_SYMBOL_GPL(coresight_unregister);