Keep track of enabled sink buffers as paths between source and sinks are being built. That way sinks associated to a source can be accessed quickly.
Signed-off-by: Mathieu Poirier <[email protected]> --- drivers/hwtracing/coresight/coresight-priv.h | 3 ++- drivers/hwtracing/coresight/coresight.c | 11 +++++++---- include/linux/coresight.h | 2 ++ 3 files changed, 11 insertions(+), 5 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index 8a52fdcb4bd6..3d7467f315ed 100644 --- a/drivers/hwtracing/coresight/coresight-priv.h +++ b/drivers/hwtracing/coresight/coresight-priv.h @@ -53,7 +53,8 @@ static inline void CS_UNLOCK(void __iomem *addr) } int coresight_build_paths(struct coresight_device *csdev, - struct list_head *path, bool enable); + struct list_head *path, + struct list_head *sinks, bool enable); #ifdef CONFIG_CORESIGHT_SOURCE_ETM3X extern int etm_readl_cp14(u32 off, unsigned int *val); diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 7a54d8069670..2e9f6248fb7e 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -302,7 +302,8 @@ static int coresight_disable_path(struct list_head *path) } int coresight_build_paths(struct coresight_device *csdev, - struct list_head *path, bool enable) + struct list_head *path, + struct list_head *sinks, bool enable) { int i, ret = -EINVAL; struct coresight_connection *conn; @@ -314,13 +315,15 @@ int coresight_build_paths(struct coresight_device *csdev, csdev->activated) { if (enable) ret = coresight_enable_path(path); + if (!ret && sinks) + list_add(&csdev->sinks, sinks); else ret = coresight_disable_path(path); } else { for (i = 0; i < csdev->nr_outport; i++) { conn = &csdev->conns[i]; if (coresight_build_paths(conn->child_dev, - path, enable) == 0) + path, sinks, enable) == 0) ret = 0; } } @@ -347,7 +350,7 @@ int coresight_enable(struct coresight_device *csdev) if (csdev->enable) goto out; - if (coresight_build_paths(csdev, &path, true)) { + if (coresight_build_paths(csdev, &path, NULL, true)) { dev_err(&csdev->dev, "building path(s) failed\n"); goto out; } @@ -373,7 +376,7 @@ void coresight_disable(struct coresight_device *csdev) goto out; coresight_disable_source(csdev); - if (coresight_build_paths(csdev, &path, false)) + if (coresight_build_paths(csdev, &path, NULL, false)) dev_err(&csdev->dev, "releasing path(s) failed\n"); out: diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 48c3b9df0ae0..da76b2951f10 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -154,6 +154,7 @@ struct coresight_connection { * @dev: The device entity associated to this component. * @refcnt: keep track of what is in use. * @path_link: link of current component into the path being enabled. + * @sinks: list of currently enabled sinks for a source. * @orphan: true if the component has connections that haven't been linked. * @enable: 'true' if component is currently part of an active path. * @activated: 'true' only if a _sink_ has been activated. A sink can be @@ -170,6 +171,7 @@ struct coresight_device { struct device dev; atomic_t *refcnt; struct list_head path_link; + struct list_head sinks; bool orphan; bool enable; /* true only if configured as part of a path */ bool activated; /* true only if a sink is part of a path */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
