// SPDX-License-Identifier: GPL-2.0
/*
* 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/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/property.h>
#include <linux/delay.h>
#include <linux/pm_runtime.h>
#include "coresight-etm-perf.h"
#include "coresight-priv.h"
#include "coresight-syscfg.h"
/*
* Mutex used to lock all sysfs enable and disable actions and loading and
* unloading devices by the Coresight core.
*/
DEFINE_MUTEX(coresight_mutex);
static DEFINE_PER_CPU(struct coresight_device *, csdev_sink);
/**
* 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 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);
void coresight_set_percpu_sink(int cpu, struct coresight_device *csdev)
{
per_cpu(csdev_sink, cpu) = csdev;
}
EXPORT_SYMBOL_GPL(coresight_set_percpu_sink);
struct coresight_device *coresight_get_percpu_sink(int cpu)
{
return per_cpu(csdev_sink, cpu);
}
EXPORT_SYMBOL_GPL(coresight_get_percpu_sink);
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 < src_dev->pdata->nr_outconns; i++) {
conn = src_dev->pdata->out_conns[i];
if (conn->dest_dev == dest_dev)
return conn;
}
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 ERR_PTR(-ENODEV);
}
static inline u32 coresight_read_claim_tags(struct coresight_device *csdev)
{
return csdev_access_relaxed_read32(&csdev->access, CORESIGHT_CLAIMCLR);
}
static inline bool coresight_is_claimed_self_hosted(struct coresight_device *csdev)
{
return coresight_read_claim_tags(csdev) == CORESIGHT_CLAIM_SELF_HOSTED;
}
static inline bool coresight_is_claimed_any(struct coresight_device *csdev)
{
return coresight_read_claim_tags(csdev) != 0;
}
static inline void coresight_set_claim_tags(struct coresight_device *csdev)
{
csdev_access_relaxed_write32(&csdev->access, CORESIGHT_CLAIM_SELF_HOSTED,
CORESIGHT_CLAIMSET);
isb();
}
static inline void coresight_clear_claim_tags(struct coresight_device *csdev)
{
csdev_access_relaxed_write32(&csdev->access, CORESIGHT_CLAIM_SELF_HOSTED,
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(struct coresight_device *csdev)
{
if (WARN_ON(!csdev))
return -EINVAL;
if (coresight_is_claimed_any(csdev))
return -EBUSY;
coresight_set_claim_tags(csdev);
if (coresight_is_claimed_self_hosted(csdev))
return 0;
/* There was a race setting the tags, clean up and fail */
coresight_clear_claim_tags(csdev);
return -EBUSY;
}
EXPORT_SYMBOL_GPL(coresight_claim_device_unlocked);
int coresight_claim_device(struct coresight_device *csdev)
{
int rc;
if (WARN_ON(!csdev))
return -EINVAL;
CS_UNLOCK(csdev->access.base);
rc = coresight_claim_device_unlocked(csdev);
CS_LOCK(csdev->access.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(struct coresight_device *csdev)
{
if (WARN_ON(!csdev))
return;
if (coresight_is_claimed_self_hosted(csdev))
coresight_clear_claim_tags(csdev);
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(struct coresight_device *csdev)
{
if (WARN_ON(!csdev))
return;
CS_UNLOCK(csdev->access.base);
coresight_disclaim_device_unlocked(csdev);
CS_LOCK(csdev->access.base);
}
EXPORT_SYMBOL_GPL(coresight_disclaim_device);
/*
* 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 i;
struct coresight_connection conn = {};
struct coresight_connection *new_conn;
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;
/*
* 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;
new_conn = coresight_add_out_conn(csdev->dev.parent, csdev->pdata,
&conn);
if (!IS_ERR(new_conn))
coresight_add_in_conn(new_conn);
unlock:
mutex_unlock(&coresight_mutex);
}
EXPORT_SYMBOL_GPL(coresight_add_helper);
static int coresight_enable_sink(struct coresight_device *csdev,
enum cs_mode mode, void *data)
{
return sink_ops(csdev)->enable(csdev, mode, data);
}
static void coresight_disable_sink(struct coresight_device *csdev)
{
sink_ops(csdev)->disable(csdev);
}
static int coresight_enable_link(struct coresight_device *csdev,
struct coresight_device *parent,
struct coresight_device *child)
{
int link_subtype;
struct coresight_connection *inconn, *outconn;
if (!parent || !child)
return -EINVAL;
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 && IS_ERR(inconn))
return PTR_ERR(inconn);
if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT && IS_ERR(outconn))
return PTR_ERR(outconn);
return link_ops(csdev)->enable(csdev, inconn, outconn);
}
static void coresight_disable_link(struct coresight_device *csdev,
struct coresight_device *parent,
struct coresight_device *child)
{
struct coresight_connection *inconn, *outconn;
if (!parent || !child)
return;
inconn = coresight_find_out_connection(parent, csdev);
outconn = coresight_find_out_connection(csdev, child);
link_ops(csdev)->disable(csdev, inconn, outconn);
}
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)
{
return helper_ops(csdev)->enable(csdev, mode, data);
}
static void coresight_disable_helper(struct coresight_device *csdev)
{
helper_ops(csdev)->disable(csdev, NULL);
}
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);
}
}
/*
* Helper function to call source_ops(csdev)->disable and also disable the
* helpers.
*
* There is an imbalance between coresight_enable_path() and
* coresight_disable_path(). Enabling also enables the source's helpers as part
* of the path, but disabling always skips the first item in the path (which is
* the source), so sources and their helpers don't get disabled as part of that
* function and we need the extra step here.
*/
void coresight_disable_source(struct coresight_device *csdev, void *data)
{
source_ops(csdev)->disable(csdev, data);
coresight_disable_helpers(csdev);
}
EXPORT_SYMBOL_GPL(coresight_disable_source);
/*
* 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
* selected as a sink 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;
}
/* Disable all helpers adjacent along the path last */
coresight_disable_helpers(csdev);
}
}
void coresight_disable_path(struct list_head *path)
{
coresight_disable_path_from(path, NULL);
}
EXPORT_SYMBOL_GPL(coresight_disable_path);
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;
struct coresight_device *csdev, *parent, *child;
list_for_each_entry_reverse(nd, path, link) {
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
* selected as a sink 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;
}
u32 coresight_get_sink_id(struct coresight_device *csdev)
{
if (!csdev->ea)
return 0;
/*
* See function etm_perf_add_symlink_sink() to know where
* this comes from.
*/
return (u32) (unsigned long) csdev->ea->var;
}
static int coresight_sink_by_id(struct device *dev, const void *data)
{
struct coresight_device *csdev = to_coresight_device(dev);
if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) {
if (coresight_get_sink_id(csdev) == *(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.
*
* @csdev: The coresight device to get a reference on.
*
* 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.
*
* @csdev: The coresight device to decrement a reference from.
*/
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
* master device.
*/
static int coresight_grab_device(struct coresight_device *csdev)
{
int i;
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
struct coresight_device *child;
child = csdev->pdata->out_conns[i]->dest_dev;
if (child && coresight_is_helper(child))
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->out_conns[i]->dest_dev;
if (child && coresight_is_helper(child))
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_outconns; i++) {
struct coresight_device *child;
child = csdev->pdata->out_conns[i]->dest_dev;
if (child && coresight_is_helper(child))
coresight_put_ref(child);
}
}
/**
* _coresight_build_path - recursively build a path from a @csdev to a sink.
* @csdev: The device to start from.
* @sink: The final sink we want in this path.
* @path: The list to add devices to.
*
* The tree of Coresight device is traversed until @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;
/* The sink has been found. Enqueue the element */
if (csdev == sink)
goto out;
if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
sink == per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev))) {
if (_coresight_build_path(sink, sink, path) == 0) {
found = true;
goto out;
}
}
/* Not a sink - recursively explore each port found on this element */
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
struct coresight_device *child_dev;
child_dev = csdev->pdata->out_conns[i]->dest_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);
}
/* 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_outconns; i++) {
struct coresight_device *child_dev, *sink = NULL;
int child_depth = curr_depth;
child_dev = csdev->pdata->out_conns[i]->dest_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) {
if (coresight_is_percpu_source(csdev))
csdev->def_sink = per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev));
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);
}
}
static void coresight_device_release(struct device *dev)
{
struct coresight_device *csdev = to_coresight_device(dev);
fwnode_handle_put(csdev->dev.fwnode);
free_percpu(csdev->perf_sink_id_map.cpu_map);
kfree(csdev);
}
static int coresight_orphan_match(struct device *dev, void *data)
{
int i, ret = 0;
bool still_orphan = false;
struct coresight_device *dst_csdev = data;
struct coresight_device *src_csdev = to_coresight_device(dev);
struct coresight_connection *conn;
bool fixup_self = (src_csdev == dst_csdev);
/* Move on to another component if no connection is orphan */
if (!src_csdev->orphan)
return 0;
/*
* Circle through all the connections of that component. If we find
* an orphan connection whose name matches @dst_csdev, link it.
*/
for (i = 0; i < src_csdev->pdata->nr_outconns; i++) {
conn = src_csdev->pdata->out_conns[i];
/* Skip the port if it's already connected. */
if (conn->dest_dev)
continue;
/*
* If we are at the "new" device, which triggered this search,
* we must find the remote device from the fwnode in the
* connection.
*/
if (fixup_self)
dst_csdev = coresight_find_csdev_by_fwnode(
conn->dest_fwnode);
/* Does it match this newly added device? */
if (dst_csdev && conn->dest_fwnode == dst_csdev->dev.fwnode) {
ret = coresight_make_links(src_csdev, conn, dst_csdev);
if (ret)
return ret;
/*
* Install the device connection. This also indicates that
* the links are operational on both ends.
*/
conn->dest_dev = dst_csdev;
conn->src_dev = src_csdev;
ret = coresight_add_in_conn(conn);
if (ret)
return ret;
} else {
/* This component still has an orphan */
still_orphan = true;
}
}
src_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);
}
/* coresight_remove_conns - Remove other device's references to this device */
static void coresight_remove_conns(struct coresight_device *csdev)
{
int i, j;
struct coresight_connection *conn;
/*
* Remove the input connection references from the destination device
* for each output connection.
*/
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
conn = csdev->pdata->out_conns[i];
if (!conn->dest_dev)
continue;
for (j = 0; j < conn->dest_dev->pdata->nr_inconns; ++j)
if (conn->dest_dev->pdata->in_conns[j] == conn) {
conn->dest_dev->pdata->in_conns[j] = NULL;
break;
}
}
/*
* For all input connections, remove references to this device.
* Connection objects are shared so modifying this device's input
* connections affects the other device's output connection.
*/
for (i = 0; i < csdev->pdata->nr_inconns; ++i) {
conn = csdev->pdata->in_conns[i];
/* Input conns array is sparse */
if (!conn)
continue;
conn->src_dev->orphan = true;
coresight_remove_links(conn->src_dev, conn);
conn->dest_dev = NULL;
}
}
/**
* coresight_timeout - loop until a bit has changed to a specific register
* state.
* @csa: coresight device access for the device
* @offset: Offset of the register from the base of the device.
* @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(struct csdev_access *csa, u32 offset,
int position, int value)
{
int i;
u32 val;
for (i = TIMEOUT_US; i > 0; i--) {
val = csdev_access_read32(csa, 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);
u32 coresight_relaxed_read32(struct coresight_device *csdev, u32 offset)
{
return csdev_access_relaxed_read32(&csdev->access, offset);
}
u32 coresight_read32(struct coresight_device *csdev, u32 offset)
{
return csdev_access_read32(&csdev->access, offset);
}
void coresight_relaxed_write32(struct coresight_device *csdev,
u32 val, u32 offset)
{
csdev_access_relaxed_write32(&csdev->access, val, offset);
}
void coresight_write32(struct coresight_device *csdev, u32 val, u32 offset)
{
csdev_access_write32(&csdev->access, val, offset);
}
u64 coresight_relaxed_read64(struct coresight_device *csdev, u32 offset)
{
return csdev_access_relaxed_read64(&csdev->access, offset);
}
u64 coresight_read64(struct coresight_device *csdev, u32 offset)
{
return csdev_access_read64(&csdev->access, offset);
}
void coresight_relaxed_write64(struct coresight_device *csdev,
u64 val, u32 offset)
{
csdev_access_relaxed_write64(&csdev->access, val, offset);
}
void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
{
csdev_access_write64(&csdev->access, val, offset);
}
/*
* 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 device *dev,
struct coresight_platform_data *pdata)
{
int i;
struct coresight_connection **conns = pdata->out_conns;
for (i = 0; i < pdata->nr_outconns; i++) {
/* If we have made the links, remove them now */
if (csdev && conns[i]->dest_dev)
coresight_remove_links(csdev, conns[i]);
/*
* Drop the refcount and clear the handle as this device
* is going away
*/
fwnode_handle_put(conns[i]->dest_fwnode);
conns[i]->dest_fwnode = NULL;
devm_kfree(dev, conns[i]);
}
devm_kfree(dev, pdata->out_conns);
devm_kfree(dev, pdata->in_conns);
devm_kfree(dev, pdata);
if (csdev)
coresight_remove_conns_sysfs_group(csdev);
}
struct coresight_device *coresight_register(struct coresight_desc *desc)
{
int ret;
struct coresight_device *csdev;
bool registered = false;
csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
if (!csdev) {
ret = -ENOMEM;
goto err_out;
}
csdev->pdata = desc->pdata;
csdev->type = desc->type;
csdev->subtype = desc->subtype;
csdev->ops = desc->ops;
csdev->access = desc->access;
csdev->orphan = true;
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);
if (csdev->type == CORESIGHT_DEV_TYPE_SINK ||
csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) {
spin_lock_init(&csdev->perf_sink_id_map.lock);
csdev->perf_sink_id_map.cpu_map = alloc_percpu(atomic_t);
if (!csdev->perf_sink_id_map.cpu_map) {
kfree(csdev);
ret = -ENOMEM;
goto err_out;
}
}
/*
* Make sure the device registration and the connection fixup
* are synchronised, so that we don't see uninitialised devices
* on the coresight bus while trying to resolve the connections.
*/
mutex_lock(&coresight_mutex);
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 out_unlock;
}
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 out_unlock;
}
}
/* Device is now registered */
registered = true;
ret = coresight_create_conns_sysfs_group(csdev);
if (!ret)
ret = coresight_fixup_orphan_conns(csdev);
out_unlock:
mutex_unlock(&coresight_mutex);
/* Success */
if (!ret) {
if (cti_assoc_ops && cti_assoc_ops->add)
cti_assoc_ops->add(csdev);
return csdev;
}
/* Unregister the device if needed */
if (registered) {
coresight_unregister(csdev);
return ERR_PTR(ret);
}
err_out:
/* Cleanup the connection information */
coresight_release_platform_data(NULL, desc->dev, 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->dev.parent, 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;
}
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),
"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_array(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);
const 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)
goto exit_bus_unregister;
/* initialise the coresight syscfg API */
ret = cscfg_init();
if (!ret)
return 0;
etm_perf_exit();
exit_bus_unregister:
bus_unregister(&coresight_bustype);
return ret;
}
static void __exit coresight_exit(void)
{
cscfg_exit();
etm_perf_exit();
bus_unregister(&coresight_bustype);
}
module_init(coresight_init);
module_exit(coresight_exit);
int coresight_init_driver(const char *drv, struct amba_driver *amba_drv,
struct platform_driver *pdev_drv)
{
int ret;
ret = amba_driver_register(amba_drv);
if (ret) {
pr_err("%s: error registering AMBA driver\n", drv);
return ret;
}
ret = platform_driver_register(pdev_drv);
if (!ret)
return 0;
pr_err("%s: error registering platform driver\n", drv);
amba_driver_unregister(amba_drv);
return ret;
}
EXPORT_SYMBOL_GPL(coresight_init_driver);
void coresight_remove_driver(struct amba_driver *amba_drv,
struct platform_driver *pdev_drv)
{
amba_driver_unregister(amba_drv);
platform_driver_unregister(pdev_drv);
}
EXPORT_SYMBOL_GPL(coresight_remove_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Pratik Patel <[email protected]>");
MODULE_AUTHOR("Mathieu Poirier <[email protected]>");
MODULE_DESCRIPTION("Arm CoreSight tracer driver");
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