* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*/
+#include <linux/build_bug.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/coresight.h>
-#include <linux/of_platform.h>
+#include <linux/property.h>
#include <linux/delay.h>
#include <linux/pm_runtime.h>
}
EXPORT_SYMBOL_GPL(coresight_get_percpu_sink);
-static int coresight_find_link_inport(struct coresight_device *csdev,
- struct coresight_device *parent)
+static struct coresight_connection *
+coresight_find_out_connection(struct coresight_device *src_dev,
+ struct coresight_device *dest_dev)
{
int i;
struct coresight_connection *conn;
- for (i = 0; i < parent->pdata->nr_outconns; i++) {
- conn = parent->pdata->out_conns[i];
- if (conn->dest_dev == csdev)
- return conn->dest_port;
+ for (i = 0; i < src_dev->pdata->nr_outconns; i++) {
+ conn = src_dev->pdata->out_conns[i];
+ if (conn->dest_dev == dest_dev)
+ return conn;
}
- dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
- dev_name(&parent->dev), dev_name(&csdev->dev));
+ dev_err(&src_dev->dev,
+ "couldn't find output connection, src_dev: %s, dest_dev: %s\n",
+ dev_name(&src_dev->dev), dev_name(&dest_dev->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_outconns; i++) {
- conn = csdev->pdata->out_conns[i];
- if (conn->dest_dev == child)
- return conn->src_port;
- }
-
- dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
- dev_name(&csdev->dev), dev_name(&child->dev));
-
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
}
static inline u32 coresight_read_claim_tags(struct coresight_device *csdev)
}
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)
+/*
+ * Add a helper as an output device. This function takes the @coresight_mutex
+ * because it's assumed that it's called from the helper device, outside of the
+ * core code where the mutex would already be held. Don't add new calls to this
+ * from inside the core code, instead try to add the new helper to the DT and
+ * ACPI where it will be picked up and linked automatically.
+ */
+void coresight_add_helper(struct coresight_device *csdev,
+ struct coresight_device *helper)
{
- int ect_ret = 0;
- struct coresight_device *ect_csdev = csdev->ect_dev;
- struct module *mod;
+ int i;
+ struct coresight_connection conn = {};
+ struct coresight_connection *new_conn;
- if (!ect_csdev)
- return 0;
- if ((!ect_ops(ect_csdev)->enable) || (!ect_ops(ect_csdev)->disable))
- return 0;
+ mutex_lock(&coresight_mutex);
+ conn.dest_fwnode = fwnode_handle_get(dev_fwnode(&helper->dev));
+ conn.dest_dev = helper;
+ conn.dest_port = conn.src_port = -1;
+ conn.src_dev = csdev;
- 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;
- }
- }
+ /*
+ * Check for duplicates because this is called every time a helper
+ * device is re-loaded. Existing connections will get re-linked
+ * automatically.
+ */
+ for (i = 0; i < csdev->pdata->nr_outconns; ++i)
+ if (csdev->pdata->out_conns[i]->dest_fwnode == conn.dest_fwnode)
+ goto unlock;
- /* 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;
-}
+ new_conn = coresight_add_out_conn(csdev->dev.parent, csdev->pdata,
+ &conn);
+ if (!IS_ERR(new_conn))
+ coresight_add_in_conn(new_conn);
-/*
- * 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;
+unlock:
mutex_unlock(&coresight_mutex);
}
-EXPORT_SYMBOL_GPL(coresight_set_assoc_ectdev_mutex);
+EXPORT_SYMBOL_GPL(coresight_add_helper);
static int coresight_enable_sink(struct coresight_device *csdev,
enum cs_mode mode, void *data)
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);
+ if (ret)
return ret;
- }
+
csdev->enable = true;
return 0;
ret = sink_ops(csdev)->disable(csdev);
if (ret)
return;
- coresight_control_assoc_ectdev(csdev, false);
csdev->enable = false;
}
{
int ret = 0;
int link_subtype;
- int inport, outport;
+ struct coresight_connection *inconn, *outconn;
if (!parent || !child)
return -EINVAL;
- inport = coresight_find_link_inport(csdev, parent);
- outport = coresight_find_link_outport(csdev, child);
+ inconn = coresight_find_out_connection(parent, csdev);
+ outconn = coresight_find_out_connection(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_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG && IS_ERR(inconn))
+ return PTR_ERR(inconn);
+ if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT && IS_ERR(outconn))
+ return PTR_ERR(outconn);
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);
- }
+ ret = link_ops(csdev)->enable(csdev, inconn, outconn);
+ if (!ret)
+ csdev->enable = true;
}
- if (!ret)
- csdev->enable = true;
-
return ret;
}
struct coresight_device *parent,
struct coresight_device *child)
{
- int i, nr_conns;
+ int i;
int link_subtype;
- int inport, outport;
+ struct coresight_connection *inconn, *outconn;
if (!parent || !child)
return;
- inport = coresight_find_link_inport(csdev, parent);
- outport = coresight_find_link_outport(csdev, child);
+ inconn = coresight_find_out_connection(parent, csdev);
+ outconn = coresight_find_out_connection(csdev, child);
link_subtype = csdev->subtype.link_subtype;
- if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
- nr_conns = csdev->pdata->high_inport;
- } else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
- nr_conns = csdev->pdata->high_outport;
- } else {
- nr_conns = 1;
- }
-
if (link_ops(csdev)->disable) {
- link_ops(csdev)->disable(csdev, inport, outport);
- coresight_control_assoc_ectdev(csdev, false);
+ link_ops(csdev)->disable(csdev, inconn, outconn);
}
- for (i = 0; i < nr_conns; i++)
- if (atomic_read(&csdev->refcnt[i]) != 0)
+ if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
+ for (i = 0; i < csdev->pdata->nr_inconns; i++)
+ if (atomic_read(&csdev->pdata->in_conns[i]->dest_refcnt) !=
+ 0)
+ return;
+ } else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
+ for (i = 0; i < csdev->pdata->nr_outconns; i++)
+ if (atomic_read(&csdev->pdata->out_conns[i]->src_refcnt) !=
+ 0)
+ return;
+ } else {
+ if (atomic_read(&csdev->refcnt) != 0)
return;
+ }
csdev->enable = false;
}
-static int coresight_enable_source(struct coresight_device *csdev,
- enum cs_mode mode)
+int coresight_enable_source(struct coresight_device *csdev, enum cs_mode mode,
+ void *data)
{
int ret;
if (!csdev->enable) {
if (source_ops(csdev)->enable) {
- ret = coresight_control_assoc_ectdev(csdev, true);
+ ret = source_ops(csdev)->enable(csdev, data, mode);
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);
+ atomic_inc(&csdev->refcnt);
return 0;
}
+EXPORT_SYMBOL_GPL(coresight_enable_source);
+
+static bool coresight_is_helper(struct coresight_device *csdev)
+{
+ return csdev->type == CORESIGHT_DEV_TYPE_HELPER;
+}
+
+static int coresight_enable_helper(struct coresight_device *csdev,
+ enum cs_mode mode, void *data)
+{
+ int ret;
+
+ if (!helper_ops(csdev)->enable)
+ return 0;
+ ret = helper_ops(csdev)->enable(csdev, mode, data);
+ if (ret)
+ return ret;
+
+ csdev->enable = true;
+ return 0;
+}
+
+static void coresight_disable_helper(struct coresight_device *csdev)
+{
+ int ret;
+
+ if (!helper_ops(csdev)->disable)
+ return;
+
+ ret = helper_ops(csdev)->disable(csdev, NULL);
+ if (ret)
+ return;
+ csdev->enable = false;
+}
+
+static void coresight_disable_helpers(struct coresight_device *csdev)
+{
+ int i;
+ struct coresight_device *helper;
+
+ for (i = 0; i < csdev->pdata->nr_outconns; ++i) {
+ helper = csdev->pdata->out_conns[i]->dest_dev;
+ if (helper && coresight_is_helper(helper))
+ coresight_disable_helper(helper);
+ }
+}
/**
* 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
+ * @data: Opaque data to pass on to the disable function of the source device.
+ * For example in perf mode this is a pointer to the struct perf_event.
*
* Returns true if the device has been disabled.
*/
-static bool coresight_disable_source(struct coresight_device *csdev)
+bool coresight_disable_source(struct coresight_device *csdev, void *data)
{
- if (atomic_dec_return(csdev->refcnt) == 0) {
+ if (atomic_dec_return(&csdev->refcnt) == 0) {
if (source_ops(csdev)->disable)
- source_ops(csdev)->disable(csdev, NULL);
- coresight_control_assoc_ectdev(csdev, false);
+ source_ops(csdev)->disable(csdev, data);
+ coresight_disable_helpers(csdev);
csdev->enable = false;
}
return !csdev->enable;
}
+EXPORT_SYMBOL_GPL(coresight_disable_source);
/*
* coresight_disable_path_from : Disable components in the given path beyond
default:
break;
}
+
+ /* Disable all helpers adjacent along the path last */
+ coresight_disable_helpers(csdev);
}
}
}
EXPORT_SYMBOL_GPL(coresight_disable_path);
-int coresight_enable_path(struct list_head *path, enum cs_mode mode, void *sink_data)
+static int coresight_enable_helpers(struct coresight_device *csdev,
+ enum cs_mode mode, void *data)
{
+ int i, ret = 0;
+ struct coresight_device *helper;
+ for (i = 0; i < csdev->pdata->nr_outconns; ++i) {
+ helper = csdev->pdata->out_conns[i]->dest_dev;
+ if (!helper || !coresight_is_helper(helper))
+ continue;
+
+ ret = coresight_enable_helper(helper, mode, data);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+int coresight_enable_path(struct list_head *path, enum cs_mode mode,
+ void *sink_data)
+{
int ret = 0;
u32 type;
struct coresight_node *nd;
csdev = nd->csdev;
type = csdev->type;
+ /* Enable all helpers adjacent to the path first */
+ ret = coresight_enable_helpers(csdev, mode, sink_data);
+ if (ret)
+ goto err;
/*
* ETF devices are tricky... They can be a link or a sink,
* depending on how they are configured. If an ETF has been
struct coresight_device *child;
child = csdev->pdata->out_conns[i]->dest_dev;
- if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
+ if (child && coresight_is_helper(child))
if (!coresight_get_ref(child))
goto err;
}
struct coresight_device *child;
child = csdev->pdata->out_conns[i]->dest_dev;
- if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
+ if (child && coresight_is_helper(child))
coresight_put_ref(child);
}
return -ENODEV;
struct coresight_device *child;
child = csdev->pdata->out_conns[i]->dest_dev;
- if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
+ if (child && coresight_is_helper(child))
coresight_put_ref(child);
}
}
* source is already enabled.
*/
if (subtype == CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE)
- atomic_inc(csdev->refcnt);
+ atomic_inc(&csdev->refcnt);
goto out;
}
if (ret)
goto err_path;
- ret = coresight_enable_source(csdev, CS_MODE_SYSFS);
+ ret = coresight_enable_source(csdev, CS_MODE_SYSFS, NULL);
if (ret)
goto err_source;
if (ret)
goto out;
- if (!csdev->enable || !coresight_disable_source(csdev))
+ if (!csdev->enable || !coresight_disable_source(csdev, NULL))
goto out;
switch (csdev->subtype.source_subtype) {
},
{
.name = "helper",
- },
- {
- .name = "ect",
- },
+ }
};
+/* Ensure the enum matches the names and groups */
+static_assert(ARRAY_SIZE(coresight_dev_type) == CORESIGHT_DEV_TYPE_MAX);
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);
}
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;
bool registered = false;
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->high_inport;
- else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
- nr_refcnts = desc->pdata->high_outport;
- }
-
- refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
- if (!refcnts) {
- ret = -ENOMEM;
- kfree(csdev);
- goto err_out;
- }
-
- csdev->refcnt = refcnts;
-
csdev->pdata = desc->pdata;
csdev->type = desc->type;
return -ENOENT;
}
+static bool coresight_compare_type(enum coresight_dev_type type_a,
+ union coresight_dev_subtype subtype_a,
+ enum coresight_dev_type type_b,
+ union coresight_dev_subtype subtype_b)
+{
+ if (type_a != type_b)
+ return false;
+
+ switch (type_a) {
+ case CORESIGHT_DEV_TYPE_SINK:
+ return subtype_a.sink_subtype == subtype_b.sink_subtype;
+ case CORESIGHT_DEV_TYPE_LINK:
+ return subtype_a.link_subtype == subtype_b.link_subtype;
+ case CORESIGHT_DEV_TYPE_LINKSINK:
+ return subtype_a.link_subtype == subtype_b.link_subtype &&
+ subtype_a.sink_subtype == subtype_b.sink_subtype;
+ case CORESIGHT_DEV_TYPE_SOURCE:
+ return subtype_a.source_subtype == subtype_b.source_subtype;
+ case CORESIGHT_DEV_TYPE_HELPER:
+ return subtype_a.helper_subtype == subtype_b.helper_subtype;
+ default:
+ return false;
+ }
+}
+
+struct coresight_device *
+coresight_find_input_type(struct coresight_platform_data *pdata,
+ enum coresight_dev_type type,
+ union coresight_dev_subtype subtype)
+{
+ int i;
+ struct coresight_connection *conn;
+
+ for (i = 0; i < pdata->nr_inconns; ++i) {
+ conn = pdata->in_conns[i];
+ if (conn &&
+ coresight_compare_type(type, subtype, conn->src_dev->type,
+ conn->src_dev->subtype))
+ return conn->src_dev;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(coresight_find_input_type);
+
+struct coresight_device *
+coresight_find_output_type(struct coresight_platform_data *pdata,
+ enum coresight_dev_type type,
+ union coresight_dev_subtype subtype)
+{
+ int i;
+ struct coresight_connection *conn;
+
+ for (i = 0; i < pdata->nr_outconns; ++i) {
+ conn = pdata->out_conns[i];
+ if (conn->dest_dev &&
+ coresight_compare_type(type, subtype, conn->dest_dev->type,
+ conn->dest_dev->subtype))
+ return conn->dest_dev;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(coresight_find_output_type);
+
bool coresight_loses_context_with_cpu(struct device *dev)
{
return fwnode_property_present(dev_fwnode(dev),
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