# Coresight configuration
#
menuconfig CORESIGHT
- bool "CoreSight Tracing Support"
+ tristate "CoreSight Tracing Support"
depends on ARM || ARM64
depends on OF || ACPI
select ARM_AMBA
specification and configure the right series of components when a
trace source gets enabled.
+ To compile this driver as a module, choose M here: the
+ module will be called coresight.
+
if CORESIGHT
config CORESIGHT_LINKS_AND_SINKS
tristate "CoreSight Link and Sink drivers"
#
# Makefile for CoreSight drivers.
#
-obj-$(CONFIG_CORESIGHT) += coresight.o coresight-etm-perf.o \
- coresight-platform.o coresight-sysfs.o
+obj-$(CONFIG_CORESIGHT) += coresight.o
+coresight-y := coresight-core.o coresight-etm-perf.o coresight-platform.o \
+ coresight-sysfs.o
obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o
coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \
coresight-tmc-etr.o
--- /dev/null
+// 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);
+
+/*
+ * 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);
+
+struct bus_type coresight_bustype = {
+ .name = "coresight",
+};
+
+static int __init coresight_init(void)
+{
+ int ret;
+
+ ret = bus_register(&coresight_bustype);
+ if (ret)
+ return ret;
+
+ ret = etm_perf_init();
+ if (ret)
+ bus_unregister(&coresight_bustype);
+
+ return ret;
+}
+
+static void __exit coresight_exit(void)
+{
+ etm_perf_exit();
+ bus_unregister(&coresight_bustype);
+}
+
+module_init(coresight_init);
+module_exit(coresight_exit);
+
+MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
+MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
+MODULE_DESCRIPTION("Arm CoreSight tracer driver");
csdev->ea = NULL;
}
-static int __init etm_perf_init(void)
+int __init etm_perf_init(void)
{
int ret;
return ret;
}
-device_initcall(etm_perf_init);
+
+void __exit etm_perf_exit(void)
+{
+ perf_pmu_unregister(&etm_pmu);
+}
#endif /* CONFIG_CORESIGHT */
+int __init etm_perf_init(void);
+void __exit etm_perf_exit(void);
+
#endif
+++ /dev/null
-// 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);
projects / linux.git / commitdiff