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coresight: Store pointers to connections rather than an array of them 

This will allow the same connection object to be referenced via the
input connection list in a later commit rather than duplicating them.

Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230425143542.2305069-8-james.clark@arm.com
This commit is contained in:
James Clark 2023-04-25 15:35:34 +01:00 committed by Suzuki K Poulose
parent 3d4ff657e4
commit 4e8fe7e5c3
5 changed files with 44 additions and 30 deletions
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47
drivers/hwtracing/coresight/coresight-core.c
View File

@ -119,7 +119,7 @@ static int coresight_find_link_inport(struct coresight_device *csdev,
struct coresight_connection *conn;
for (i = 0; i < parent->pdata->nr_outconns; i++) {
conn = &parent->pdata->out_conns[i];
conn = parent->pdata->out_conns[i];
if (conn->dest_dev == csdev)
return conn->dest_port;
}
@ -137,7 +137,7 @@ static int coresight_find_link_outport(struct coresight_device *csdev,
struct coresight_connection *conn;
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
conn = &csdev->pdata->out_conns[i];
conn = csdev->pdata->out_conns[i];
if (conn->dest_dev == child)
return conn->src_port;
}
@ -606,7 +606,7 @@ coresight_find_enabled_sink(struct coresight_device *csdev)
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
struct coresight_device *child_dev;
child_dev = csdev->pdata->out_conns[i].dest_dev;
child_dev = csdev->pdata->out_conns[i]->dest_dev;
if (child_dev)
sink = coresight_find_enabled_sink(child_dev);
if (sink)
@ -722,7 +722,7 @@ static int coresight_grab_device(struct coresight_device *csdev)
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
struct coresight_device *child;
child = csdev->pdata->out_conns[i].dest_dev;
child = csdev->pdata->out_conns[i]->dest_dev;
if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
if (!coresight_get_ref(child))
goto err;
@ -733,7 +733,7 @@ err:
for (i--; i >= 0; i--) {
struct coresight_device *child;
child = csdev->pdata->out_conns[i].dest_dev;
child = csdev->pdata->out_conns[i]->dest_dev;
if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
coresight_put_ref(child);
}
@ -752,7 +752,7 @@ static void coresight_drop_device(struct coresight_device *csdev)
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
struct coresight_device *child;
child = csdev->pdata->out_conns[i].dest_dev;
child = csdev->pdata->out_conns[i]->dest_dev;
if (child && child->type == CORESIGHT_DEV_TYPE_HELPER)
coresight_put_ref(child);
}
@ -794,7 +794,7 @@ static int _coresight_build_path(struct coresight_device *csdev,
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
struct coresight_device *child_dev;
child_dev = csdev->pdata->out_conns[i].dest_dev;
child_dev = csdev->pdata->out_conns[i]->dest_dev;
if (child_dev &&
_coresight_build_path(child_dev, sink, path) == 0) {
found = true;
@ -964,7 +964,7 @@ coresight_find_sink(struct coresight_device *csdev, int *depth)
struct coresight_device *child_dev, *sink = NULL;
int child_depth = curr_depth;
child_dev = csdev->pdata->out_conns[i].dest_dev;
child_dev = csdev->pdata->out_conns[i]->dest_dev;
if (child_dev)
sink = coresight_find_sink(child_dev, &child_depth);
@ -1334,7 +1334,7 @@ static int coresight_orphan_match(struct device *dev, void *data)
* an orphan connection whose name matches @csdev, link it.
*/
for (i = 0; i < i_csdev->pdata->nr_outconns; i++) {
conn = &i_csdev->pdata->out_conns[i];
conn = i_csdev->pdata->out_conns[i];
/* We have found at least one orphan connection */
if (conn->dest_dev == NULL) {
@ -1372,7 +1372,7 @@ static int coresight_fixup_device_conns(struct coresight_device *csdev)
int i, ret = 0;
for (i = 0; i < csdev->pdata->nr_outconns; i++) {
struct coresight_connection *conn = &csdev->pdata->out_conns[i];
struct coresight_connection *conn = csdev->pdata->out_conns[i];
conn->dest_dev =
coresight_find_csdev_by_fwnode(conn->dest_fwnode);
@ -1406,15 +1406,12 @@ static int coresight_remove_match(struct device *dev, void *data)
* a connection whose name matches @csdev, remove it.
*/
for (i = 0; i < iterator->pdata->nr_outconns; i++) {
conn = &iterator->pdata->out_conns[i];
conn = iterator->pdata->out_conns[i];
if (conn->dest_dev == NULL)
continue;
if (csdev->dev.fwnode == conn->dest_fwnode) {
/* Child_dev being set signifies that the links were made */
if (csdev->dev.fwnode == conn->dest_fwnode && conn->dest_dev) {
iterator->orphan = true;
coresight_remove_links(iterator, conn);
conn->dest_dev = NULL;
/* No need to continue */
break;
@ -1534,22 +1531,26 @@ void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset)
* 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;
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]);
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;
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);
if (csdev)
coresight_remove_conns_sysfs_group(csdev);
}
@ -1666,7 +1667,7 @@ out_unlock:
err_out:
/* Cleanup the connection information */
coresight_release_platform_data(NULL, desc->pdata);
coresight_release_platform_data(NULL, desc->dev, desc->pdata);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(coresight_register);
@ -1679,7 +1680,7 @@ void coresight_unregister(struct coresight_device *csdev)
cti_assoc_ops->remove(csdev);
coresight_remove_conns(csdev);
coresight_clear_default_sink(csdev);
coresight_release_platform_data(csdev, csdev->pdata);
coresight_release_platform_data(csdev, csdev->dev.parent, csdev->pdata);
device_unregister(&csdev->dev);
}
EXPORT_SYMBOL_GPL(coresight_unregister);

19
drivers/hwtracing/coresight/coresight-platform.c
View File

@ -37,7 +37,7 @@ coresight_add_out_conn(struct device *dev,
* Warn on any existing duplicate output port.
*/
for (i = 0; i < pdata->nr_outconns; ++i) {
conn = &pdata->out_conns[i];
conn = pdata->out_conns[i];
/* Output == -1 means ignore the port for example for helpers */
if (conn->src_port != -1 &&
conn->src_port == new_conn->src_port) {
@ -54,8 +54,19 @@ coresight_add_out_conn(struct device *dev,
if (!pdata->out_conns)
return ERR_PTR(-ENOMEM);
pdata->out_conns[pdata->nr_outconns - 1] = *new_conn;
return &pdata->out_conns[pdata->nr_outconns - 1];
conn = devm_kmalloc(dev, sizeof(struct coresight_connection),
GFP_KERNEL);
if (!conn)
return ERR_PTR(-ENOMEM);
/*
* Copy the new connection into the allocation, save the pointer to the
* end of the connection array and also return it in case it needs to be
* used right away.
*/
*conn = *new_conn;
pdata->out_conns[pdata->nr_outconns - 1] = conn;
return conn;
}
EXPORT_SYMBOL_GPL(coresight_add_out_conn);
@ -863,7 +874,7 @@ coresight_get_platform_data(struct device *dev)
error:
if (!IS_ERR_OR_NULL(pdata))
/* Cleanup the connection information */
coresight_release_platform_data(NULL, pdata);
coresight_release_platform_data(NULL, dev, pdata);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(coresight_get_platform_data);

1
drivers/hwtracing/coresight/coresight-priv.h
View File

@ -207,6 +207,7 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
}
void coresight_release_platform_data(struct coresight_device *csdev,
struct device *dev,
struct coresight_platform_data *pdata);
struct coresight_device *
coresight_find_csdev_by_fwnode(struct fwnode_handle *r_fwnode);

2
drivers/hwtracing/coresight/coresight-tmc-etr.c
View File

@ -782,7 +782,7 @@ tmc_etr_get_catu_device(struct tmc_drvdata *drvdata)
return NULL;
for (i = 0; i < etr->pdata->nr_outconns; i++) {
tmp = etr->pdata->out_conns[i].dest_dev;
tmp = etr->pdata->out_conns[i]->dest_dev;
if (tmp && coresight_is_catu_device(tmp))
return tmp;
}

5
include/linux/coresight.h
View File

@ -104,14 +104,15 @@ union coresight_dev_subtype {
*
* @nr_inconns: Number of elements for the input connections.
* @nr_outconns: Number of elements for the output connections.
* @out_conns: Array of nr_outconns connections from this component.
* @out_conns: Array of nr_outconns pointers to connections from this
* component.
*/
struct coresight_platform_data {
int high_inport;
int high_outport;
int nr_inconns;
int nr_outconns;
struct coresight_connection *out_conns;
struct coresight_connection **out_conns;
};
/**