coresight: core: Allow the coresight core driver to be built as a module

Enhance coresight developer's efficiency to debug coresight drivers.
- Kconfig becomes a tristate, to allow =m
- append -core to source file name to allow module to
  be called coresight by the Makefile
- modules can have only one init/exit, so we add the etm_perf
  register/unregister function calls to the core init/exit
  functions.
- add a MODULE_DEVICE_TABLE for autoloading on boot

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@armlinux.org.uk>
Tested-by: Mike Leach <mike.leach@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200928163513.70169-25-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 1672 deletions

diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
deleted file mode 100644
index 5aebdbe293f2..000000000000
--- a/drivers/hwtracing/coresight/coresight.c
+++ /dev/null
@@ -1,1672 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2012, The Linux Foundation. All rights reserved.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/err.h>
-#include <linux/export.h>
-#include <linux/slab.h>
-#include <linux/stringhash.h>
-#include <linux/mutex.h>
-#include <linux/clk.h>
-#include <linux/coresight.h>
-#include <linux/of_platform.h>
-#include <linux/delay.h>
-#include <linux/pm_runtime.h>
-
-#include "coresight-etm-perf.h"
-#include "coresight-priv.h"
-
-static DEFINE_MUTEX(coresight_mutex);
-
-/**
- * struct coresight_node - elements of a path, from source to sink
- * @csdev:	Address of an element.
- * @link:	hook to the list.
- */
-struct coresight_node {
-	struct coresight_device *csdev;
-	struct list_head link;
-};
-
-/*
- * When operating Coresight drivers from the sysFS interface, only a single
- * path can exist from a tracer (associated to a CPU) to a sink.
- */
-static DEFINE_PER_CPU(struct list_head *, tracer_path);
-
-/*
- * As of this writing only a single STM can be found in CS topologies.  Since
- * there is no way to know if we'll ever see more and what kind of
- * configuration they will enact, for the time being only define a single path
- * for STM.
- */
-static struct list_head *stm_path;
-
-/*
- * When losing synchronisation a new barrier packet needs to be inserted at the
- * beginning of the data collected in a buffer.  That way the decoder knows that
- * it needs to look for another sync sequence.
- */
-const u32 coresight_barrier_pkt[4] = {0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff};
-EXPORT_SYMBOL_GPL(coresight_barrier_pkt);
-
-static const struct cti_assoc_op *cti_assoc_ops;
-
-void coresight_set_cti_ops(const struct cti_assoc_op *cti_op)
-{
-	cti_assoc_ops = cti_op;
-}
-EXPORT_SYMBOL_GPL(coresight_set_cti_ops);
-
-void coresight_remove_cti_ops(void)
-{
-	cti_assoc_ops = NULL;
-}
-EXPORT_SYMBOL_GPL(coresight_remove_cti_ops);
-
-static int coresight_id_match(struct device *dev, void *data)
-{
-	int trace_id, i_trace_id;
-	struct coresight_device *csdev, *i_csdev;
-
-	csdev = data;
-	i_csdev = to_coresight_device(dev);
-
-	/*
-	 * No need to care about oneself and components that are not
-	 * sources or not enabled
-	 */
-	if (i_csdev == csdev || !i_csdev->enable ||
-	    i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
-		return 0;
-
-	/* Get the source ID for both compoment */
-	trace_id = source_ops(csdev)->trace_id(csdev);
-	i_trace_id = source_ops(i_csdev)->trace_id(i_csdev);
-
-	/* All you need is one */
-	if (trace_id == i_trace_id)
-		return 1;
-
-	return 0;
-}
-
-static int coresight_source_is_unique(struct coresight_device *csdev)
-{
-	int trace_id = source_ops(csdev)->trace_id(csdev);
-
-	/* this shouldn't happen */
-	if (trace_id < 0)
-		return 0;
-
-	return !bus_for_each_dev(&coresight_bustype, NULL,
-				 csdev, coresight_id_match);
-}
-
-static int coresight_find_link_inport(struct coresight_device *csdev,
-				      struct coresight_device *parent)
-{
-	int i;
-	struct coresight_connection *conn;
-
-	for (i = 0; i < parent->pdata->nr_outport; i++) {
-		conn = &parent->pdata->conns[i];
-		if (conn->child_dev == csdev)
-			return conn->child_port;
-	}
-
-	dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
-		dev_name(&parent->dev), dev_name(&csdev->dev));
-
-	return -ENODEV;
-}
-
-static int coresight_find_link_outport(struct coresight_device *csdev,
-				       struct coresight_device *child)
-{
-	int i;
-	struct coresight_connection *conn;
-
-	for (i = 0; i < csdev->pdata->nr_outport; i++) {
-		conn = &csdev->pdata->conns[i];
-		if (conn->child_dev == child)
-			return conn->outport;
-	}
-
-	dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
-		dev_name(&csdev->dev), dev_name(&child->dev));
-
-	return -ENODEV;
-}
-
-static inline u32 coresight_read_claim_tags(void __iomem *base)
-{
-	return readl_relaxed(base + CORESIGHT_CLAIMCLR);
-}
-
-static inline bool coresight_is_claimed_self_hosted(void __iomem *base)
-{
-	return coresight_read_claim_tags(base) == CORESIGHT_CLAIM_SELF_HOSTED;
-}
-
-static inline bool coresight_is_claimed_any(void __iomem *base)
-{
-	return coresight_read_claim_tags(base) != 0;
-}
-
-static inline void coresight_set_claim_tags(void __iomem *base)
-{
-	writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMSET);
-	isb();
-}
-
-static inline void coresight_clear_claim_tags(void __iomem *base)
-{
-	writel_relaxed(CORESIGHT_CLAIM_SELF_HOSTED, base + CORESIGHT_CLAIMCLR);
-	isb();
-}
-
-/*
- * coresight_claim_device_unlocked : Claim the device for self-hosted usage
- * to prevent an external tool from touching this device. As per PSCI
- * standards, section "Preserving the execution context" => "Debug and Trace
- * save and Restore", DBGCLAIM[1] is reserved for Self-hosted debug/trace and
- * DBGCLAIM[0] is reserved for external tools.
- *
- * Called with CS_UNLOCKed for the component.
- * Returns : 0 on success
- */
-int coresight_claim_device_unlocked(void __iomem *base)
-{
-	if (coresight_is_claimed_any(base))
-		return -EBUSY;
-
-	coresight_set_claim_tags(base);
-	if (coresight_is_claimed_self_hosted(base))
-		return 0;
-	/* There was a race setting the tags, clean up and fail */
-	coresight_clear_claim_tags(base);
-	return -EBUSY;
-}
-EXPORT_SYMBOL_GPL(coresight_claim_device_unlocked);
-
-int coresight_claim_device(void __iomem *base)
-{
-	int rc;
-
-	CS_UNLOCK(base);
-	rc = coresight_claim_device_unlocked(base);
-	CS_LOCK(base);
-
-	return rc;
-}
-EXPORT_SYMBOL_GPL(coresight_claim_device);
-
-/*
- * coresight_disclaim_device_unlocked : Clear the claim tags for the device.
- * Called with CS_UNLOCKed for the component.
- */
-void coresight_disclaim_device_unlocked(void __iomem *base)
-{
-
-	if (coresight_is_claimed_self_hosted(base))
-		coresight_clear_claim_tags(base);
-	else
-		/*
-		 * The external agent may have not honoured our claim
-		 * and has manipulated it. Or something else has seriously
-		 * gone wrong in our driver.
-		 */
-		WARN_ON_ONCE(1);
-}
-EXPORT_SYMBOL_GPL(coresight_disclaim_device_unlocked);
-
-void coresight_disclaim_device(void __iomem *base)
-{
-	CS_UNLOCK(base);
-	coresight_disclaim_device_unlocked(base);
-	CS_LOCK(base);
-}
-EXPORT_SYMBOL_GPL(coresight_disclaim_device);
-
-/* enable or disable an associated CTI device of the supplied CS device */
-static int
-coresight_control_assoc_ectdev(struct coresight_device *csdev, bool enable)
-{
-	int ect_ret = 0;
-	struct coresight_device *ect_csdev = csdev->ect_dev;
-	struct module *mod;
-
-	if (!ect_csdev)
-		return 0;
-	if ((!ect_ops(ect_csdev)->enable) || (!ect_ops(ect_csdev)->disable))
-		return 0;
-
-	mod = ect_csdev->dev.parent->driver->owner;
-	if (enable) {
-		if (try_module_get(mod)) {
-			ect_ret = ect_ops(ect_csdev)->enable(ect_csdev);
-			if (ect_ret) {
-				module_put(mod);
-			} else {
-				get_device(ect_csdev->dev.parent);
-				csdev->ect_enabled = true;
-			}
-		} else
-			ect_ret = -ENODEV;
-	} else {
-		if (csdev->ect_enabled) {
-			ect_ret = ect_ops(ect_csdev)->disable(ect_csdev);
-			put_device(ect_csdev->dev.parent);
-			module_put(mod);
-			csdev->ect_enabled = false;
-		}
-	}
-
-	/* output warning if ECT enable is preventing trace operation */
-	if (ect_ret)
-		dev_info(&csdev->dev, "Associated ECT device (%s) %s failed\n",
-			 dev_name(&ect_csdev->dev),
-			 enable ? "enable" : "disable");
-	return ect_ret;
-}
-
-/*
- * Set the associated ect / cti device while holding the coresight_mutex
- * to avoid a race with coresight_enable that may try to use this value.
- */
-void coresight_set_assoc_ectdev_mutex(struct coresight_device *csdev,
-				      struct coresight_device *ect_csdev)
-{
-	mutex_lock(&coresight_mutex);
-	csdev->ect_dev = ect_csdev;
-	mutex_unlock(&coresight_mutex);
-}
-EXPORT_SYMBOL_GPL(coresight_set_assoc_ectdev_mutex);
-
-static int coresight_enable_sink(struct coresight_device *csdev,
-				 u32 mode, void *data)
-{
-	int ret;
-
-	/*
-	 * We need to make sure the "new" session is compatible with the
-	 * existing "mode" of operation.
-	 */
-	if (!sink_ops(csdev)->enable)
-		return -EINVAL;
-
-	ret = coresight_control_assoc_ectdev(csdev, true);
-	if (ret)
-		return ret;
-	ret = sink_ops(csdev)->enable(csdev, mode, data);
-	if (ret) {
-		coresight_control_assoc_ectdev(csdev, false);
-		return ret;
-	}
-	csdev->enable = true;
-
-	return 0;
-}
-
-static void coresight_disable_sink(struct coresight_device *csdev)
-{
-	int ret;
-
-	if (!sink_ops(csdev)->disable)
-		return;
-
-	ret = sink_ops(csdev)->disable(csdev);
-	if (ret)
-		return;
-	coresight_control_assoc_ectdev(csdev, false);
-	csdev->enable = false;
-}
-
-static int coresight_enable_link(struct coresight_device *csdev,
-				 struct coresight_device *parent,
-				 struct coresight_device *child)
-{
-	int ret = 0;
-	int link_subtype;
-	int inport, outport;
-
-	if (!parent || !child)
-		return -EINVAL;
-
-	inport = coresight_find_link_inport(csdev, parent);
-	outport = coresight_find_link_outport(csdev, child);
-	link_subtype = csdev->subtype.link_subtype;
-
-	if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG && inport < 0)
-		return inport;
-	if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT && outport < 0)
-		return outport;
-
-	if (link_ops(csdev)->enable) {
-		ret = coresight_control_assoc_ectdev(csdev, true);
-		if (!ret) {
-			ret = link_ops(csdev)->enable(csdev, inport, outport);
-			if (ret)
-				coresight_control_assoc_ectdev(csdev, false);
-		}
-	}
-
-	if (!ret)
-		csdev->enable = true;
-
-	return ret;
-}
-
-static void coresight_disable_link(struct coresight_device *csdev,
-				   struct coresight_device *parent,
-				   struct coresight_device *child)
-{
-	int i, nr_conns;
-	int link_subtype;
-	int inport, outport;
-
-	if (!parent || !child)
-		return;
-
-	inport = coresight_find_link_inport(csdev, parent);
-	outport = coresight_find_link_outport(csdev, child);
-	link_subtype = csdev->subtype.link_subtype;
-
-	if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
-		nr_conns = csdev->pdata->nr_inport;
-	} else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
-		nr_conns = csdev->pdata->nr_outport;
-	} else {
-		nr_conns = 1;
-	}
-
-	if (link_ops(csdev)->disable) {
-		link_ops(csdev)->disable(csdev, inport, outport);
-		coresight_control_assoc_ectdev(csdev, false);
-	}
-
-	for (i = 0; i < nr_conns; i++)
-		if (atomic_read(&csdev->refcnt[i]) != 0)
-			return;
-
-	csdev->enable = false;
-}
-
-static int coresight_enable_source(struct coresight_device *csdev, u32 mode)
-{
-	int ret;
-
-	if (!coresight_source_is_unique(csdev)) {
-		dev_warn(&csdev->dev, "traceID %d not unique\n",
-			 source_ops(csdev)->trace_id(csdev));
-		return -EINVAL;
-	}
-
-	if (!csdev->enable) {
-		if (source_ops(csdev)->enable) {
-			ret = coresight_control_assoc_ectdev(csdev, true);
-			if (ret)
-				return ret;
-			ret = source_ops(csdev)->enable(csdev, NULL, mode);
-			if (ret) {
-				coresight_control_assoc_ectdev(csdev, false);
-				return ret;
-			};
-		}
-		csdev->enable = true;
-	}
-
-	atomic_inc(csdev->refcnt);
-
-	return 0;
-}
-
-/**
- *  coresight_disable_source - Drop the reference count by 1 and disable
- *  the device if there are no users left.
- *
- *  @csdev - The coresight device to disable
- *
- *  Returns true if the device has been disabled.
- */
-static bool coresight_disable_source(struct coresight_device *csdev)
-{
-	if (atomic_dec_return(csdev->refcnt) == 0) {
-		if (source_ops(csdev)->disable)
-			source_ops(csdev)->disable(csdev, NULL);
-		coresight_control_assoc_ectdev(csdev, false);
-		csdev->enable = false;
-	}
-	return !csdev->enable;
-}
-
-/*
- * coresight_disable_path_from : Disable components in the given path beyond
- * @nd in the list. If @nd is NULL, all the components, except the SOURCE are
- * disabled.
- */
-static void coresight_disable_path_from(struct list_head *path,
-					struct coresight_node *nd)
-{
-	u32 type;
-	struct coresight_device *csdev, *parent, *child;
-
-	if (!nd)
-		nd = list_first_entry(path, struct coresight_node, link);
-
-	list_for_each_entry_continue(nd, path, link) {
-		csdev = nd->csdev;
-		type = csdev->type;
-
-		/*
-		 * ETF devices are tricky... They can be a link or a sink,
-		 * depending on how they are configured.  If an ETF has been
-		 * "activated" it will be configured as a sink, otherwise
-		 * go ahead with the link configuration.
-		 */
-		if (type == CORESIGHT_DEV_TYPE_LINKSINK)
-			type = (csdev == coresight_get_sink(path)) ?
-						CORESIGHT_DEV_TYPE_SINK :
-						CORESIGHT_DEV_TYPE_LINK;
-
-		switch (type) {
-		case CORESIGHT_DEV_TYPE_SINK:
-			coresight_disable_sink(csdev);
-			break;
-		case CORESIGHT_DEV_TYPE_SOURCE:
-			/*
-			 * We skip the first node in the path assuming that it
-			 * is the source. So we don't expect a source device in
-			 * the middle of a path.
-			 */
-			WARN_ON(1);
-			break;
-		case CORESIGHT_DEV_TYPE_LINK:
-			parent = list_prev_entry(nd, link)->csdev;
-			child = list_next_entry(nd, link)->csdev;
-			coresight_disable_link(csdev, parent, child);
-			break;
-		default:
-			break;
-		}
-	}
-}
-
-void coresight_disable_path(struct list_head *path)
-{
-	coresight_disable_path_from(path, NULL);
-}
-EXPORT_SYMBOL_GPL(coresight_disable_path);
-
-int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data)
-{
-
-	int ret = 0;
-	u32 type;
-	struct coresight_node *nd;
-	struct coresight_device *csdev, *parent, *child;
-
-	list_for_each_entry_reverse(nd, path, link) {
-		csdev = nd->csdev;
-		type = csdev->type;
-
-		/*
-		 * ETF devices are tricky... They can be a link or a sink,
-		 * depending on how they are configured.  If an ETF has been
-		 * "activated" it will be configured as a sink, otherwise
-		 * go ahead with the link configuration.
-		 */
-		if (type == CORESIGHT_DEV_TYPE_LINKSINK)
-			type = (csdev == coresight_get_sink(path)) ?
-						CORESIGHT_DEV_TYPE_SINK :
-						CORESIGHT_DEV_TYPE_LINK;
-
-		switch (type) {
-		case CORESIGHT_DEV_TYPE_SINK:
-			ret = coresight_enable_sink(csdev, mode, sink_data);
-			/*
-			 * Sink is the first component turned on. If we
-			 * failed to enable the sink, there are no components
-			 * that need disabling. Disabling the path here
-			 * would mean we could disrupt an existing session.
-			 */
-			if (ret)
-				goto out;
-			break;
-		case CORESIGHT_DEV_TYPE_SOURCE:
-			/* sources are enabled from either sysFS or Perf */
-			break;
-		case CORESIGHT_DEV_TYPE_LINK:
-			parent = list_prev_entry(nd, link)->csdev;
-			child = list_next_entry(nd, link)->csdev;
-			ret = coresight_enable_link(csdev, parent, child);
-			if (ret)
-				goto err;
-			break;
-		default:
-			goto err;
-		}
-	}
-
-out:
-	return ret;
-err:
-	coresight_disable_path_from(path, nd);
-	goto out;
-}
-
-struct coresight_device *coresight_get_sink(struct list_head *path)
-{
-	struct coresight_device *csdev;
-
-	if (!path)
-		return NULL;
-
-	csdev = list_last_entry(path, struct coresight_node, link)->csdev;
-	if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
-	    csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
-		return NULL;
-
-	return csdev;
-}
-
-static struct coresight_device *
-coresight_find_enabled_sink(struct coresight_device *csdev)
-{
-	int i;
-	struct coresight_device *sink;
-
-	if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
-	     csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
-	     csdev->activated)
-		return csdev;
-
-	/*
-	 * Recursively explore each port found on this element.
-	 */
-	for (i = 0; i < csdev->pdata->nr_outport; i++) {
-		struct coresight_device *child_dev;
-
-		child_dev = csdev->pdata->conns[i].child_dev;
-		if (child_dev)
-			sink = coresight_find_enabled_sink(child_dev);
-		if (sink)
-			return sink;
-	}
-
-	return NULL;
-}
-
-/**
- * coresight_get_enabled_sink - returns the first enabled sink using
- * connection based search starting from the source reference
- *
- * @source: Coresight source device reference
- */
-struct coresight_device *
-coresight_get_enabled_sink(struct coresight_device *source)
-{
-	if (!source)
-		return NULL;
-
-	return coresight_find_enabled_sink(source);
-}
-
-static int coresight_sink_by_id(struct device *dev, const void *data)
-{
-	struct coresight_device *csdev = to_coresight_device(dev);
-	unsigned long hash;
-
-	if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
-	     csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) {
-
-		if (!csdev->ea)
-			return 0;
-		/*
-		 * See function etm_perf_add_symlink_sink() to know where
-		 * this comes from.
-		 */
-		hash = (unsigned long)csdev->ea->var;
-
-		if ((u32)hash == *(u32 *)data)
-			return 1;
-	}
-
-	return 0;
-}
-
-/**
- * coresight_get_sink_by_id - returns the sink that matches the id
- * @id: Id of the sink to match
- *
- * The name of a sink is unique, whether it is found on the AMBA bus or
- * otherwise.  As such the hash of that name can easily be used to identify
- * a sink.
- */
-struct coresight_device *coresight_get_sink_by_id(u32 id)
-{
-	struct device *dev = NULL;
-
-	dev = bus_find_device(&coresight_bustype, NULL, &id,
-			      coresight_sink_by_id);
-
-	return dev ? to_coresight_device(dev) : NULL;
-}
-
-/**
- * coresight_get_ref- Helper function to increase reference count to module
- * and device.
- * Return true in successful case and power up the device.
- * Return false when failed to get reference of module.
- */
-static inline bool coresight_get_ref(struct coresight_device *csdev)
-{
-	struct device *dev = csdev->dev.parent;
-
-	/* Make sure the driver can't be removed */
-	if (!try_module_get(dev->driver->owner))
-		return false;
-	/* Make sure the device can't go away */
-	get_device(dev);
-	pm_runtime_get_sync(dev);
-	return true;
-}
-
-/**
- * coresight_put_ref- Helper function to decrease reference count to module
- * and device. Power off the device.
- */
-static inline void coresight_put_ref(struct coresight_device *csdev)
-{
-	struct device *dev = csdev->dev.parent;
-
-	pm_runtime_put(dev);
-	put_device(dev);
-	module_put(dev->driver->owner);
-}
-
-/*
- * coresight_grab_device - Power up this device and any of the helper
- * devices connected to it for trace operation. Since the helper devices
- * don't appear on the trace path, they should be handled along with the
- * the master device.
- */
-static int coresight_grab_device(struct coresight_device *csdev)
-{
-	int i;
-
-	for (i = 0; i < csdev->pdata->nr_outport; i++) {
-		struct coresight_device *child;
-
-		child  = csdev->pdata->conns[i].child_dev;
-		if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
-			if (!coresight_get_ref(child))
-				goto err;
-	}
-	if (coresight_get_ref(csdev))
-		return 0;
-err:
-	for (i--; i >= 0; i--) {
-		struct coresight_device *child;
-
-		child  = csdev->pdata->conns[i].child_dev;
-		if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
-			coresight_put_ref(child);
-	}
-	return -ENODEV;
-}
-
-/*
- * coresight_drop_device - Release this device and any of the helper
- * devices connected to it.
- */
-static void coresight_drop_device(struct coresight_device *csdev)
-{
-	int i;
-
-	coresight_put_ref(csdev);
-	for (i = 0; i < csdev->pdata->nr_outport; i++) {
-		struct coresight_device *child;
-
-		child  = csdev->pdata->conns[i].child_dev;
-		if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
-			coresight_put_ref(child);
-	}
-}
-
-/**
- * _coresight_build_path - recursively build a path from a @csdev to a sink.
- * @csdev:	The device to start from.
- * @path:	The list to add devices to.
- *
- * The tree of Coresight device is traversed until an activated sink is
- * found.  From there the sink is added to the list along with all the
- * devices that led to that point - the end result is a list from source
- * to sink. In that list the source is the first device and the sink the
- * last one.
- */
-static int _coresight_build_path(struct coresight_device *csdev,
-				 struct coresight_device *sink,
-				 struct list_head *path)
-{
-	int i, ret;
-	bool found = false;
-	struct coresight_node *node;
-
-	/* An activated sink has been found.  Enqueue the element */
-	if (csdev == sink)
-		goto out;
-
-	/* Not a sink - recursively explore each port found on this element */
-	for (i = 0; i < csdev->pdata->nr_outport; i++) {
-		struct coresight_device *child_dev;
-
-		child_dev = csdev->pdata->conns[i].child_dev;
-		if (child_dev &&
-		    _coresight_build_path(child_dev, sink, path) == 0) {
-			found = true;
-			break;
-		}
-	}
-
-	if (!found)
-		return -ENODEV;
-
-out:
-	/*
-	 * A path from this element to a sink has been found.  The elements
-	 * leading to the sink are already enqueued, all that is left to do
-	 * is tell the PM runtime core we need this element and add a node
-	 * for it.
-	 */
-	ret = coresight_grab_device(csdev);
-	if (ret)
-		return ret;
-
-	node = kzalloc(sizeof(struct coresight_node), GFP_KERNEL);
-	if (!node)
-		return -ENOMEM;
-
-	node->csdev = csdev;
-	list_add(&node->link, path);
-
-	return 0;
-}
-
-struct list_head *coresight_build_path(struct coresight_device *source,
-				       struct coresight_device *sink)
-{
-	struct list_head *path;
-	int rc;
-
-	if (!sink)
-		return ERR_PTR(-EINVAL);
-
-	path = kzalloc(sizeof(struct list_head), GFP_KERNEL);
-	if (!path)
-		return ERR_PTR(-ENOMEM);
-
-	INIT_LIST_HEAD(path);
-
-	rc = _coresight_build_path(source, sink, path);
-	if (rc) {
-		kfree(path);
-		return ERR_PTR(rc);
-	}
-
-	return path;
-}
-
-/**
- * coresight_release_path - release a previously built path.
- * @path:	the path to release.
- *
- * Go through all the elements of a path and 1) removed it from the list and
- * 2) free the memory allocated for each node.
- */
-void coresight_release_path(struct list_head *path)
-{
-	struct coresight_device *csdev;
-	struct coresight_node *nd, *next;
-
-	list_for_each_entry_safe(nd, next, path, link) {
-		csdev = nd->csdev;
-
-		coresight_drop_device(csdev);
-		list_del(&nd->link);
-		kfree(nd);
-	}
-
-	kfree(path);
-	path = NULL;
-}
-
-/* return true if the device is a suitable type for a default sink */
-static inline bool coresight_is_def_sink_type(struct coresight_device *csdev)
-{
-	/* sink & correct subtype */
-	if (((csdev->type == CORESIGHT_DEV_TYPE_SINK) ||
-	     (csdev->type == CORESIGHT_DEV_TYPE_LINKSINK)) &&
-	    (csdev->subtype.sink_subtype >= CORESIGHT_DEV_SUBTYPE_SINK_BUFFER))
-		return true;
-	return false;
-}
-
-/**
- * coresight_select_best_sink - return the best sink for use as default from
- * the two provided.
- *
- * @sink:	current best sink.
- * @depth:      search depth where current sink was found.
- * @new_sink:	new sink for comparison with current sink.
- * @new_depth:  search depth where new sink was found.
- *
- * Sinks prioritised according to coresight_dev_subtype_sink, with only
- * subtypes CORESIGHT_DEV_SUBTYPE_SINK_BUFFER or higher being used.
- *
- * Where two sinks of equal priority are found, the sink closest to the
- * source is used (smallest search depth).
- *
- * return @new_sink & update @depth if better than @sink, else return @sink.
- */
-static struct coresight_device *
-coresight_select_best_sink(struct coresight_device *sink, int *depth,
-			   struct coresight_device *new_sink, int new_depth)
-{
-	bool update = false;
-
-	if (!sink) {
-		/* first found at this level */
-		update = true;
-	} else if (new_sink->subtype.sink_subtype >
-		   sink->subtype.sink_subtype) {
-		/* found better sink */
-		update = true;
-	} else if ((new_sink->subtype.sink_subtype ==
-		    sink->subtype.sink_subtype) &&
-		   (*depth > new_depth)) {
-		/* found same but closer sink */
-		update = true;
-	}
-
-	if (update)
-		*depth = new_depth;
-	return update ? new_sink : sink;
-}
-
-/**
- * coresight_find_sink - recursive function to walk trace connections from
- * source to find a suitable default sink.
- *
- * @csdev: source / current device to check.
- * @depth: [in] search depth of calling dev, [out] depth of found sink.
- *
- * This will walk the connection path from a source (ETM) till a suitable
- * sink is encountered and return that sink to the original caller.
- *
- * If current device is a plain sink return that & depth, otherwise recursively
- * call child connections looking for a sink. Select best possible using
- * coresight_select_best_sink.
- *
- * return best sink found, or NULL if not found at this node or child nodes.
- */
-static struct coresight_device *
-coresight_find_sink(struct coresight_device *csdev, int *depth)
-{
-	int i, curr_depth = *depth + 1, found_depth = 0;
-	struct coresight_device *found_sink = NULL;
-
-	if (coresight_is_def_sink_type(csdev)) {
-		found_depth = curr_depth;
-		found_sink = csdev;
-		if (csdev->type == CORESIGHT_DEV_TYPE_SINK)
-			goto return_def_sink;
-		/* look past LINKSINK for something better */
-	}
-
-	/*
-	 * Not a sink we want - or possible child sink may be better.
-	 * recursively explore each port found on this element.
-	 */
-	for (i = 0; i < csdev->pdata->nr_outport; i++) {
-		struct coresight_device *child_dev, *sink = NULL;
-		int child_depth = curr_depth;
-
-		child_dev = csdev->pdata->conns[i].child_dev;
-		if (child_dev)
-			sink = coresight_find_sink(child_dev, &child_depth);
-
-		if (sink)
-			found_sink = coresight_select_best_sink(found_sink,
-								&found_depth,
-								sink,
-								child_depth);
-	}
-
-return_def_sink:
-	/* return found sink and depth */
-	if (found_sink)
-		*depth = found_depth;
-	return found_sink;
-}
-
-/**
- * coresight_find_default_sink: Find a sink suitable for use as a
- * default sink.
- *
- * @csdev: starting source to find a connected sink.
- *
- * Walks connections graph looking for a suitable sink to enable for the
- * supplied source. Uses CoreSight device subtypes and distance from source
- * to select the best sink.
- *
- * If a sink is found, then the default sink for this device is set and
- * will be automatically used in future.
- *
- * Used in cases where the CoreSight user (perf / sysfs) has not selected a
- * sink.
- */
-struct coresight_device *
-coresight_find_default_sink(struct coresight_device *csdev)
-{
-	int depth = 0;
-
-	/* look for a default sink if we have not found for this device */
-	if (!csdev->def_sink)
-		csdev->def_sink = coresight_find_sink(csdev, &depth);
-	return csdev->def_sink;
-}
-
-static int coresight_remove_sink_ref(struct device *dev, void *data)
-{
-	struct coresight_device *sink = data;
-	struct coresight_device *source = to_coresight_device(dev);
-
-	if (source->def_sink == sink)
-		source->def_sink = NULL;
-	return 0;
-}
-
-/**
- * coresight_clear_default_sink: Remove all default sink references to the
- * supplied sink.
- *
- * If supplied device is a sink, then check all the bus devices and clear
- * out all the references to this sink from the coresight_device def_sink
- * parameter.
- *
- * @csdev: coresight sink - remove references to this from all sources.
- */
-static void coresight_clear_default_sink(struct coresight_device *csdev)
-{
-	if ((csdev->type == CORESIGHT_DEV_TYPE_SINK) ||
-	    (csdev->type == CORESIGHT_DEV_TYPE_LINKSINK)) {
-		bus_for_each_dev(&coresight_bustype, NULL, csdev,
-				 coresight_remove_sink_ref);
-	}
-}
-
-/** coresight_validate_source - make sure a source has the right credentials
- *  @csdev:	the device structure for a source.
- *  @function:	the function this was called from.
- *
- * Assumes the coresight_mutex is held.
- */
-static int coresight_validate_source(struct coresight_device *csdev,
-				     const char *function)
-{
-	u32 type, subtype;
-
-	type = csdev->type;
-	subtype = csdev->subtype.source_subtype;
-
-	if (type != CORESIGHT_DEV_TYPE_SOURCE) {
-		dev_err(&csdev->dev, "wrong device type in %s\n", function);
-		return -EINVAL;
-	}
-
-	if (subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_PROC &&
-	    subtype != CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE) {
-		dev_err(&csdev->dev, "wrong device subtype in %s\n", function);
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-int coresight_enable(struct coresight_device *csdev)
-{
-	int cpu, ret = 0;
-	struct coresight_device *sink;
-	struct list_head *path;
-	enum coresight_dev_subtype_source subtype;
-
-	subtype = csdev->subtype.source_subtype;
-
-	mutex_lock(&coresight_mutex);
-
-	ret = coresight_validate_source(csdev, __func__);
-	if (ret)
-		goto out;
-
-	if (csdev->enable) {
-		/*
-		 * There could be multiple applications driving the software
-		 * source. So keep the refcount for each such user when the
-		 * source is already enabled.
-		 */
-		if (subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE)
-			atomic_inc(csdev->refcnt);
-		goto out;
-	}
-
-	sink = coresight_get_enabled_sink(csdev);
-	if (!sink) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	path = coresight_build_path(csdev, sink);
-	if (IS_ERR(path)) {
-		pr_err("building path(s) failed\n");
-		ret = PTR_ERR(path);
-		goto out;
-	}
-
-	ret = coresight_enable_path(path, CS_MODE_SYSFS, NULL);
-	if (ret)
-		goto err_path;
-
-	ret = coresight_enable_source(csdev, CS_MODE_SYSFS);
-	if (ret)
-		goto err_source;
-
-	switch (subtype) {
-	case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
-		/*
-		 * When working from sysFS it is important to keep track
-		 * of the paths that were created so that they can be
-		 * undone in 'coresight_disable()'.  Since there can only
-		 * be a single session per tracer (when working from sysFS)
-		 * a per-cpu variable will do just fine.
-		 */
-		cpu = source_ops(csdev)->cpu_id(csdev);
-		per_cpu(tracer_path, cpu) = path;
-		break;
-	case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
-		stm_path = path;
-		break;
-	default:
-		/* We can't be here */
-		break;
-	}
-
-out:
-	mutex_unlock(&coresight_mutex);
-	return ret;
-
-err_source:
-	coresight_disable_path(path);
-
-err_path:
-	coresight_release_path(path);
-	goto out;
-}
-EXPORT_SYMBOL_GPL(coresight_enable);
-
-void coresight_disable(struct coresight_device *csdev)
-{
-	int cpu, ret;
-	struct list_head *path = NULL;
-
-	mutex_lock(&coresight_mutex);
-
-	ret = coresight_validate_source(csdev, __func__);
-	if (ret)
-		goto out;
-
-	if (!csdev->enable || !coresight_disable_source(csdev))
-		goto out;
-
-	switch (csdev->subtype.source_subtype) {
-	case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
-		cpu = source_ops(csdev)->cpu_id(csdev);
-		path = per_cpu(tracer_path, cpu);
-		per_cpu(tracer_path, cpu) = NULL;
-		break;
-	case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
-		path = stm_path;
-		stm_path = NULL;
-		break;
-	default:
-		/* We can't be here */
-		break;
-	}
-
-	coresight_disable_path(path);
-	coresight_release_path(path);
-
-out:
-	mutex_unlock(&coresight_mutex);
-}
-EXPORT_SYMBOL_GPL(coresight_disable);
-
-static ssize_t enable_sink_show(struct device *dev,
-				struct device_attribute *attr, char *buf)
-{
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->activated);
-}
-
-static ssize_t enable_sink_store(struct device *dev,
-				 struct device_attribute *attr,
-				 const char *buf, size_t size)
-{
-	int ret;
-	unsigned long val;
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	ret = kstrtoul(buf, 10, &val);
-	if (ret)
-		return ret;
-
-	if (val)
-		csdev->activated = true;
-	else
-		csdev->activated = false;
-
-	return size;
-
-}
-static DEVICE_ATTR_RW(enable_sink);
-
-static ssize_t enable_source_show(struct device *dev,
-				  struct device_attribute *attr, char *buf)
-{
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	return scnprintf(buf, PAGE_SIZE, "%u\n", csdev->enable);
-}
-
-static ssize_t enable_source_store(struct device *dev,
-				   struct device_attribute *attr,
-				   const char *buf, size_t size)
-{
-	int ret = 0;
-	unsigned long val;
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	ret = kstrtoul(buf, 10, &val);
-	if (ret)
-		return ret;
-
-	if (val) {
-		ret = coresight_enable(csdev);
-		if (ret)
-			return ret;
-	} else {
-		coresight_disable(csdev);
-	}
-
-	return size;
-}
-static DEVICE_ATTR_RW(enable_source);
-
-static struct attribute *coresight_sink_attrs[] = {
-	&dev_attr_enable_sink.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(coresight_sink);
-
-static struct attribute *coresight_source_attrs[] = {
-	&dev_attr_enable_source.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(coresight_source);
-
-static struct device_type coresight_dev_type[] = {
-	{
-		.name = "none",
-	},
-	{
-		.name = "sink",
-		.groups = coresight_sink_groups,
-	},
-	{
-		.name = "link",
-	},
-	{
-		.name = "linksink",
-		.groups = coresight_sink_groups,
-	},
-	{
-		.name = "source",
-		.groups = coresight_source_groups,
-	},
-	{
-		.name = "helper",
-	},
-	{
-		.name = "ect",
-	},
-};
-
-static void coresight_device_release(struct device *dev)
-{
-	struct coresight_device *csdev = to_coresight_device(dev);
-
-	fwnode_handle_put(csdev->dev.fwnode);
-	kfree(csdev->refcnt);
-	kfree(csdev);
-}
-
-static int coresight_orphan_match(struct device *dev, void *data)
-{
-	int i, ret = 0;
-	bool still_orphan = false;
-	struct coresight_device *csdev, *i_csdev;
-	struct coresight_connection *conn;
-
-	csdev = data;
-	i_csdev = to_coresight_device(dev);
-
-	/* No need to check oneself */
-	if (csdev == i_csdev)
-		return 0;
-
-	/* Move on to another component if no connection is orphan */
-	if (!i_csdev->orphan)
-		return 0;
-	/*
-	 * Circle throuch all the connection of that component.  If we find
-	 * an orphan connection whose name matches @csdev, link it.
-	 */
-	for (i = 0; i < i_csdev->pdata->nr_outport; i++) {
-		conn = &i_csdev->pdata->conns[i];
-
-		/* Skip the port if FW doesn't describe it */
-		if (!conn->child_fwnode)
-			continue;
-		/* We have found at least one orphan connection */
-		if (conn->child_dev == NULL) {
-			/* Does it match this newly added device? */
-			if (conn->child_fwnode == csdev->dev.fwnode) {
-				ret = coresight_make_links(i_csdev,
-							   conn, csdev);
-				if (ret)
-					return ret;
-			} else {
-				/* This component still has an orphan */
-				still_orphan = true;
-			}
-		}
-	}
-
-	i_csdev->orphan = still_orphan;
-
-	/*
-	 * Returning '0' in case we didn't encounter any error,
-	 * ensures that all known component on the bus will be checked.
-	 */
-	return 0;
-}
-
-static int coresight_fixup_orphan_conns(struct coresight_device *csdev)
-{
-	return bus_for_each_dev(&coresight_bustype, NULL,
-			 csdev, coresight_orphan_match);
-}
-
-
-static int coresight_fixup_device_conns(struct coresight_device *csdev)
-{
-	int i, ret = 0;
-
-	for (i = 0; i < csdev->pdata->nr_outport; i++) {
-		struct coresight_connection *conn = &csdev->pdata->conns[i];
-
-		if (!conn->child_fwnode)
-			continue;
-		conn->child_dev =
-			coresight_find_csdev_by_fwnode(conn->child_fwnode);
-		if (conn->child_dev) {
-			ret = coresight_make_links(csdev, conn,
-						   conn->child_dev);
-			if (ret)
-				break;
-		} else {
-			csdev->orphan = true;
-		}
-	}
-
-	return 0;
-}
-
-static int coresight_remove_match(struct device *dev, void *data)
-{
-	int i;
-	struct coresight_device *csdev, *iterator;
-	struct coresight_connection *conn;
-
-	csdev = data;
-	iterator = to_coresight_device(dev);
-
-	/* No need to check oneself */
-	if (csdev == iterator)
-		return 0;
-
-	/*
-	 * Circle throuch all the connection of that component.  If we find
-	 * a connection whose name matches @csdev, remove it.
-	 */
-	for (i = 0; i < iterator->pdata->nr_outport; i++) {
-		conn = &iterator->pdata->conns[i];
-
-		if (conn->child_dev == NULL || conn->child_fwnode == NULL)
-			continue;
-
-		if (csdev->dev.fwnode == conn->child_fwnode) {
-			iterator->orphan = true;
-			coresight_remove_links(iterator, conn);
-			/*
-			 * Drop the reference to the handle for the remote
-			 * device acquired in parsing the connections from
-			 * platform data.
-			 */
-			fwnode_handle_put(conn->child_fwnode);
-			/* No need to continue */
-			break;
-		}
-	}
-
-	/*
-	 * Returning '0' ensures that all known component on the
-	 * bus will be checked.
-	 */
-	return 0;
-}
-
-/*
- * coresight_remove_conns - Remove references to this given devices
- * from the connections of other devices.
- */
-static void coresight_remove_conns(struct coresight_device *csdev)
-{
-	/*
-	 * Another device will point to this device only if there is
-	 * an output port connected to this one. i.e, if the device
-	 * doesn't have at least one input port, there is no point
-	 * in searching all the devices.
-	 */
-	if (csdev->pdata->nr_inport)
-		bus_for_each_dev(&coresight_bustype, NULL,
-				 csdev, coresight_remove_match);
-}
-
-/**
- * coresight_timeout - loop until a bit has changed to a specific state.
- * @addr: base address of the area of interest.
- * @offset: address of a register, starting from @addr.
- * @position: the position of the bit of interest.
- * @value: the value the bit should have.
- *
- * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
- * TIMEOUT_US has elapsed, which ever happens first.
- */
-
-int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
-{
-	int i;
-	u32 val;
-
-	for (i = TIMEOUT_US; i > 0; i--) {
-		val = __raw_readl(addr + offset);
-		/* waiting on the bit to go from 0 to 1 */
-		if (value) {
-			if (val & BIT(position))
-				return 0;
-		/* waiting on the bit to go from 1 to 0 */
-		} else {
-			if (!(val & BIT(position)))
-				return 0;
-		}
-
-		/*
-		 * Delay is arbitrary - the specification doesn't say how long
-		 * we are expected to wait.  Extra check required to make sure
-		 * we don't wait needlessly on the last iteration.
-		 */
-		if (i - 1)
-			udelay(1);
-	}
-
-	return -EAGAIN;
-}
-EXPORT_SYMBOL_GPL(coresight_timeout);
-
-struct bus_type coresight_bustype = {
-	.name	= "coresight",
-};
-
-static int __init coresight_init(void)
-{
-	return bus_register(&coresight_bustype);
-}
-postcore_initcall(coresight_init);
-
-/*
- * coresight_release_platform_data: Release references to the devices connected
- * to the output port of this device.
- */
-void coresight_release_platform_data(struct coresight_device *csdev,
-				     struct coresight_platform_data *pdata)
-{
-	int i;
-	struct coresight_connection *conns = pdata->conns;
-
-	for (i = 0; i < pdata->nr_outport; i++) {
-		/* If we have made the links, remove them now */
-		if (csdev && conns[i].child_dev)
-			coresight_remove_links(csdev, &conns[i]);
-		/*
-		 * Drop the refcount and clear the handle as this device
-		 * is going away
-		 */
-		if (conns[i].child_fwnode) {
-			fwnode_handle_put(conns[i].child_fwnode);
-			pdata->conns[i].child_fwnode = NULL;
-		}
-	}
-	if (csdev)
-		coresight_remove_conns_sysfs_group(csdev);
-}
-
-struct coresight_device *coresight_register(struct coresight_desc *desc)
-{
-	int ret;
-	int link_subtype;
-	int nr_refcnts = 1;
-	atomic_t *refcnts = NULL;
-	struct coresight_device *csdev;
-
-	csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
-	if (!csdev) {
-		ret = -ENOMEM;
-		goto err_out;
-	}
-
-	if (desc->type == CORESIGHT_DEV_TYPE_LINK ||
-	    desc->type == CORESIGHT_DEV_TYPE_LINKSINK) {
-		link_subtype = desc->subtype.link_subtype;
-
-		if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
-			nr_refcnts = desc->pdata->nr_inport;
-		else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
-			nr_refcnts = desc->pdata->nr_outport;
-	}
-
-	refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
-	if (!refcnts) {
-		ret = -ENOMEM;
-		goto err_free_csdev;
-	}
-
-	csdev->refcnt = refcnts;
-
-	csdev->pdata = desc->pdata;
-
-	csdev->type = desc->type;
-	csdev->subtype = desc->subtype;
-	csdev->ops = desc->ops;
-	csdev->orphan = false;
-
-	csdev->dev.type = &coresight_dev_type[desc->type];
-	csdev->dev.groups = desc->groups;
-	csdev->dev.parent = desc->dev;
-	csdev->dev.release = coresight_device_release;
-	csdev->dev.bus = &coresight_bustype;
-	/*
-	 * Hold the reference to our parent device. This will be
-	 * dropped only in coresight_device_release().
-	 */
-	csdev->dev.fwnode = fwnode_handle_get(dev_fwnode(desc->dev));
-	dev_set_name(&csdev->dev, "%s", desc->name);
-
-	ret = device_register(&csdev->dev);
-	if (ret) {
-		put_device(&csdev->dev);
-		/*
-		 * All resources are free'd explicitly via
-		 * coresight_device_release(), triggered from put_device().
-		 */
-		goto err_out;
-	}
-
-	if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
-	    csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) {
-		ret = etm_perf_add_symlink_sink(csdev);
-
-		if (ret) {
-			device_unregister(&csdev->dev);
-			/*
-			 * As with the above, all resources are free'd
-			 * explicitly via coresight_device_release() triggered
-			 * from put_device(), which is in turn called from
-			 * function device_unregister().
-			 */
-			goto err_out;
-		}
-	}
-
-	mutex_lock(&coresight_mutex);
-
-	ret = coresight_create_conns_sysfs_group(csdev);
-	if (!ret)
-		ret = coresight_fixup_device_conns(csdev);
-	if (!ret)
-		ret = coresight_fixup_orphan_conns(csdev);
-	if (!ret && cti_assoc_ops && cti_assoc_ops->add)
-		cti_assoc_ops->add(csdev);
-
-	mutex_unlock(&coresight_mutex);
-	if (ret) {
-		coresight_unregister(csdev);
-		return ERR_PTR(ret);
-	}
-
-	return csdev;
-
-err_free_csdev:
-	kfree(csdev);
-err_out:
-	/* Cleanup the connection information */
-	coresight_release_platform_data(NULL, desc->pdata);
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(coresight_register);
-
-void coresight_unregister(struct coresight_device *csdev)
-{
-	etm_perf_del_symlink_sink(csdev);
-	/* Remove references of that device in the topology */
-	if (cti_assoc_ops && cti_assoc_ops->remove)
-		cti_assoc_ops->remove(csdev);
-	coresight_remove_conns(csdev);
-	coresight_clear_default_sink(csdev);
-	coresight_release_platform_data(csdev, csdev->pdata);
-	device_unregister(&csdev->dev);
-}
-EXPORT_SYMBOL_GPL(coresight_unregister);
-
-
-/*
- * coresight_search_device_idx - Search the fwnode handle of a device
- * in the given dev_idx list. Must be called with the coresight_mutex held.
- *
- * Returns the index of the entry, when found. Otherwise, -ENOENT.
- */
-static inline int coresight_search_device_idx(struct coresight_dev_list *dict,
-					      struct fwnode_handle *fwnode)
-{
-	int i;
-
-	for (i = 0; i < dict->nr_idx; i++)
-		if (dict->fwnode_list[i] == fwnode)
-			return i;
-	return -ENOENT;
-}
-
-bool coresight_loses_context_with_cpu(struct device *dev)
-{
-	return fwnode_property_present(dev_fwnode(dev),
-				       "arm,coresight-loses-context-with-cpu");
-}
-EXPORT_SYMBOL_GPL(coresight_loses_context_with_cpu);
-
-/*
- * coresight_alloc_device_name - Get an index for a given device in the
- * device index list specific to a driver. An index is allocated for a
- * device and is tracked with the fwnode_handle to prevent allocating
- * duplicate indices for the same device (e.g, if we defer probing of
- * a device due to dependencies), in case the index is requested again.
- */
-char *coresight_alloc_device_name(struct coresight_dev_list *dict,
-				  struct device *dev)
-{
-	int idx;
-	char *name = NULL;
-	struct fwnode_handle **list;
-
-	mutex_lock(&coresight_mutex);
-
-	idx = coresight_search_device_idx(dict, dev_fwnode(dev));
-	if (idx < 0) {
-		/* Make space for the new entry */
-		idx = dict->nr_idx;
-		list = krealloc(dict->fwnode_list,
-				(idx + 1) * sizeof(*dict->fwnode_list),
-				GFP_KERNEL);
-		if (ZERO_OR_NULL_PTR(list)) {
-			idx = -ENOMEM;
-			goto done;
-		}
-
-		list[idx] = dev_fwnode(dev);
-		dict->fwnode_list = list;
-		dict->nr_idx = idx + 1;
-	}
-
-	name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
-done:
-	mutex_unlock(&coresight_mutex);
-	return name;
-}
-EXPORT_SYMBOL_GPL(coresight_alloc_device_name);