diff options
| -rw-r--r-- | drivers/hwtracing/coresight/coresight.c | 43 | ||||
| -rw-r--r-- | include/linux/coresight.h | 24 |
2 files changed, 65 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 7f2b478a048f..3e07fd335f8c 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -425,6 +425,42 @@ struct coresight_device *coresight_get_enabled_sink(bool deactivate) return dev ? to_coresight_device(dev) : NULL; } +/* + * 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 void coresight_grab_device(struct coresight_device *csdev) +{ + int i; + + for (i = 0; i < csdev->nr_outport; i++) { + struct coresight_device *child = csdev->conns[i].child_dev; + + if (child && child->type == CORESIGHT_DEV_TYPE_HELPER) + pm_runtime_get_sync(child->dev.parent); + } + pm_runtime_get_sync(csdev->dev.parent); +} + +/* + * 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; + + pm_runtime_put(csdev->dev.parent); + for (i = 0; i < csdev->nr_outport; i++) { + struct coresight_device *child = csdev->conns[i].child_dev; + + if (child && child->type == CORESIGHT_DEV_TYPE_HELPER) + pm_runtime_put(child->dev.parent); + } +} + /** * _coresight_build_path - recursively build a path from a @csdev to a sink. * @csdev: The device to start from. @@ -473,9 +509,9 @@ out: if (!node) return -ENOMEM; + coresight_grab_device(csdev); node->csdev = csdev; list_add(&node->link, path); - pm_runtime_get_sync(csdev->dev.parent); return 0; } @@ -519,7 +555,7 @@ void coresight_release_path(struct list_head *path) list_for_each_entry_safe(nd, next, path, link) { csdev = nd->csdev; - pm_runtime_put_sync(csdev->dev.parent); + coresight_drop_device(csdev); list_del(&nd->link); kfree(nd); } @@ -770,6 +806,9 @@ static struct device_type coresight_dev_type[] = { .name = "source", .groups = coresight_source_groups, }, + { + .name = "helper", + }, }; static void coresight_device_release(struct device *dev) diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 7c188c2a5b3c..3d40a2b135f1 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -40,6 +40,7 @@ enum coresight_dev_type { CORESIGHT_DEV_TYPE_LINK, CORESIGHT_DEV_TYPE_LINKSINK, CORESIGHT_DEV_TYPE_SOURCE, + CORESIGHT_DEV_TYPE_HELPER, }; enum coresight_dev_subtype_sink { @@ -62,6 +63,10 @@ enum coresight_dev_subtype_source { CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE, }; +enum coresight_dev_subtype_helper { + CORESIGHT_DEV_SUBTYPE_HELPER_NONE, +}; + /** * union coresight_dev_subtype - further characterisation of a type * @sink_subtype: type of sink this component is, as defined @@ -70,6 +75,8 @@ enum coresight_dev_subtype_source { * by @coresight_dev_subtype_link. * @source_subtype: type of source this component is, as defined * by @coresight_dev_subtype_source. + * @helper_subtype: type of helper this component is, as defined + * by @coresight_dev_subtype_helper. */ union coresight_dev_subtype { /* We have some devices which acts as LINK and SINK */ @@ -78,6 +85,7 @@ union coresight_dev_subtype { enum coresight_dev_subtype_link link_subtype; }; enum coresight_dev_subtype_source source_subtype; + enum coresight_dev_subtype_helper helper_subtype; }; /** @@ -172,6 +180,7 @@ struct coresight_device { #define source_ops(csdev) csdev->ops->source_ops #define sink_ops(csdev) csdev->ops->sink_ops #define link_ops(csdev) csdev->ops->link_ops +#define helper_ops(csdev) csdev->ops->helper_ops /** * struct coresight_ops_sink - basic operations for a sink @@ -231,10 +240,25 @@ struct coresight_ops_source { struct perf_event *event); }; +/** + * struct coresight_ops_helper - Operations for a helper device. + * + * All operations could pass in a device specific data, which could + * help the helper device to determine what to do. + * + * @enable : Enable the device + * @disable : Disable the device + */ +struct coresight_ops_helper { + int (*enable)(struct coresight_device *csdev, void *data); + int (*disable)(struct coresight_device *csdev, void *data); +}; + struct coresight_ops { const struct coresight_ops_sink *sink_ops; const struct coresight_ops_link *link_ops; const struct coresight_ops_source *source_ops; + const struct coresight_ops_helper *helper_ops; }; #ifdef CONFIG_CORESIGHT |