diff options
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-core.c | 113 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-platform.c | 21 | ||||
| -rw-r--r-- | include/linux/coresight.h | 5 |
3 files changed, 120 insertions, 19 deletions
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index ea38ecf26fcb..0a9380350fb5 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -75,22 +75,54 @@ struct coresight_device *coresight_get_percpu_sink(int cpu) } EXPORT_SYMBOL_GPL(coresight_get_percpu_sink); +static struct coresight_device *coresight_get_source(struct list_head *path) +{ + struct coresight_device *csdev; + + if (!path) + return NULL; + + csdev = list_first_entry(path, struct coresight_node, link)->csdev; + if (!coresight_is_device_source(csdev)) + return NULL; + + return csdev; +} + +/** + * coresight_blocks_source - checks whether the connection matches the source + * of path if connection is bound to specific source. + * @src: The source device of the trace path + * @conn: The connection of one outport + * + * Return false if the connection doesn't have a source binded or source of the + * path matches the source binds to connection. + */ +static bool coresight_blocks_source(struct coresight_device *src, + struct coresight_connection *conn) +{ + return conn->filter_src_fwnode && (conn->filter_src_dev != src); +} + static struct coresight_connection * -coresight_find_out_connection(struct coresight_device *src_dev, - struct coresight_device *dest_dev) +coresight_find_out_connection(struct coresight_device *csdev, + struct coresight_device *out_dev, + struct coresight_device *trace_src) { 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) + for (i = 0; i < csdev->pdata->nr_outconns; i++) { + conn = csdev->pdata->out_conns[i]; + if (coresight_blocks_source(trace_src, conn)) + continue; + if (conn->dest_dev == out_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)); + dev_err(&csdev->dev, + "couldn't find output connection, csdev: %s, out_dev: %s\n", + dev_name(&csdev->dev), dev_name(&out_dev->dev)); return ERR_PTR(-ENODEV); } @@ -251,7 +283,8 @@ static void coresight_disable_sink(struct coresight_device *csdev) static int coresight_enable_link(struct coresight_device *csdev, struct coresight_device *parent, - struct coresight_device *child) + struct coresight_device *child, + struct coresight_device *source) { int link_subtype; struct coresight_connection *inconn, *outconn; @@ -259,8 +292,8 @@ static int coresight_enable_link(struct coresight_device *csdev, if (!parent || !child) return -EINVAL; - inconn = coresight_find_out_connection(parent, csdev); - outconn = coresight_find_out_connection(csdev, child); + inconn = coresight_find_out_connection(parent, csdev, source); + outconn = coresight_find_out_connection(csdev, child, source); link_subtype = csdev->subtype.link_subtype; if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG && IS_ERR(inconn)) @@ -273,15 +306,16 @@ static int coresight_enable_link(struct coresight_device *csdev, static void coresight_disable_link(struct coresight_device *csdev, struct coresight_device *parent, - struct coresight_device *child) + struct coresight_device *child, + struct coresight_device *source) { struct coresight_connection *inconn, *outconn; if (!parent || !child) return; - inconn = coresight_find_out_connection(parent, csdev); - outconn = coresight_find_out_connection(csdev, child); + inconn = coresight_find_out_connection(parent, csdev, source); + outconn = coresight_find_out_connection(csdev, child, source); link_ops(csdev)->disable(csdev, inconn, outconn); } @@ -375,7 +409,8 @@ static void coresight_disable_path_from(struct list_head *path, 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); + coresight_disable_link(csdev, parent, child, + coresight_get_source(path)); break; default: break; @@ -418,7 +453,9 @@ int coresight_enable_path(struct list_head *path, enum cs_mode mode, u32 type; struct coresight_node *nd; struct coresight_device *csdev, *parent, *child; + struct coresight_device *source; + source = coresight_get_source(path); list_for_each_entry_reverse(nd, path, link) { csdev = nd->csdev; type = csdev->type; @@ -456,7 +493,7 @@ int coresight_enable_path(struct list_head *path, enum cs_mode mode, 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); + ret = coresight_enable_link(csdev, parent, child, source); if (ret) goto err; break; @@ -619,6 +656,7 @@ static void coresight_drop_device(struct coresight_device *csdev) /** * _coresight_build_path - recursively build a path from a @csdev to a sink. * @csdev: The device to start from. + * @source: The trace source device of the path. * @sink: The final sink we want in this path. * @path: The list to add devices to. * @@ -628,6 +666,7 @@ static void coresight_drop_device(struct coresight_device *csdev) * the source is the first device and the sink the last one. */ static int _coresight_build_path(struct coresight_device *csdev, + struct coresight_device *source, struct coresight_device *sink, struct list_head *path) { @@ -641,7 +680,7 @@ static int _coresight_build_path(struct coresight_device *csdev, 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) { + if (_coresight_build_path(sink, source, sink, path) == 0) { found = true; goto out; } @@ -652,8 +691,12 @@ static int _coresight_build_path(struct coresight_device *csdev, struct coresight_device *child_dev; child_dev = csdev->pdata->out_conns[i]->dest_dev; + + if (coresight_blocks_source(source, csdev->pdata->out_conns[i])) + continue; + if (child_dev && - _coresight_build_path(child_dev, sink, path) == 0) { + _coresight_build_path(child_dev, source, sink, path) == 0) { found = true; break; } @@ -698,7 +741,7 @@ struct list_head *coresight_build_path(struct coresight_device *source, INIT_LIST_HEAD(path); - rc = _coresight_build_path(source, sink, path); + rc = _coresight_build_path(source, source, sink, path); if (rc) { kfree(path); return ERR_PTR(rc); @@ -927,6 +970,16 @@ static int coresight_orphan_match(struct device *dev, void *data) for (i = 0; i < src_csdev->pdata->nr_outconns; i++) { conn = src_csdev->pdata->out_conns[i]; + /* Fix filter source device before skip the port */ + if (conn->filter_src_fwnode && !conn->filter_src_dev) { + if (dst_csdev && + (conn->filter_src_fwnode == dst_csdev->dev.fwnode) && + !WARN_ON_ONCE(!coresight_is_device_source(dst_csdev))) + conn->filter_src_dev = dst_csdev; + else + still_orphan = true; + } + /* Skip the port if it's already connected. */ if (conn->dest_dev) continue; @@ -977,18 +1030,40 @@ static int coresight_fixup_orphan_conns(struct coresight_device *csdev) csdev, coresight_orphan_match); } +static int coresight_clear_filter_source(struct device *dev, void *data) +{ + int i; + struct coresight_device *source = data; + struct coresight_device *csdev = to_coresight_device(dev); + + for (i = 0; i < csdev->pdata->nr_outconns; ++i) { + if (csdev->pdata->out_conns[i]->filter_src_dev == source) + csdev->pdata->out_conns[i]->filter_src_dev = NULL; + } + return 0; +} + /* 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; + if (coresight_is_device_source(csdev)) + bus_for_each_dev(&coresight_bustype, NULL, csdev, + coresight_clear_filter_source); + /* * 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->filter_src_fwnode) { + conn->filter_src_dev = NULL; + fwnode_handle_put(conn->filter_src_fwnode); + } + if (!conn->dest_dev) continue; diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c index 633d96b9577a..8192ba3279f0 100644 --- a/drivers/hwtracing/coresight/coresight-platform.c +++ b/drivers/hwtracing/coresight/coresight-platform.c @@ -243,6 +243,27 @@ static int of_coresight_parse_endpoint(struct device *dev, conn.dest_fwnode = fwnode_handle_get(rdev_fwnode); conn.dest_port = rendpoint.port; + /* + * Get the firmware node of the filter source through the + * reference. This could be used to filter the source in + * building path. + */ + conn.filter_src_fwnode = + fwnode_find_reference(&ep->fwnode, "filter-source", 0); + if (IS_ERR(conn.filter_src_fwnode)) { + conn.filter_src_fwnode = NULL; + } else { + conn.filter_src_dev = + coresight_find_csdev_by_fwnode(conn.filter_src_fwnode); + if (conn.filter_src_dev && + !coresight_is_device_source(conn.filter_src_dev)) { + dev_warn(dev, "port %d: Filter handle is not a trace source : %s\n", + conn.src_port, dev_name(&conn.filter_src_dev->dev)); + conn.filter_src_dev = NULL; + conn.filter_src_fwnode = NULL; + } + } + new_conn = coresight_add_out_conn(dev, pdata, &conn); if (IS_ERR_VALUE(new_conn)) { fwnode_handle_put(conn.dest_fwnode); diff --git a/include/linux/coresight.h b/include/linux/coresight.h index c50d128e8d93..17276965ff1d 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -172,6 +172,9 @@ struct coresight_desc { * @dest_dev: a @coresight_device representation of the component connected to @src_port. NULL until the device is created * @link: Representation of the connection as a sysfs link. + * @filter_src_fwnode: filter source component's fwnode handle. + * @filter_src_dev: a @coresight_device representation of the component that + needs to be filtered. * * The full connection structure looks like this, where in_conns store * references to same connection as the source device's out_conns. @@ -200,6 +203,8 @@ struct coresight_connection { struct coresight_device *dest_dev; struct coresight_sysfs_link *link; struct coresight_device *src_dev; + struct fwnode_handle *filter_src_fwnode; + struct coresight_device *filter_src_dev; int src_refcnt; int dest_refcnt; }; |