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authorSaravana Kannan <saravanak@google.com>2020-12-18 04:17:02 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-01-07 21:04:25 +0100
commitb0e2fa4f611bb9ab22928605d5b1c7fd44e73955 (patch)
tree33394fd533f69f33d1a9e77ff9fe6e786b3f73fb /drivers/base
parentdriver core: Have fw_devlink use DL_FLAG_INFERRED (diff)
downloadlinux-b0e2fa4f611bb9ab22928605d5b1c7fd44e73955.tar.xz
linux-b0e2fa4f611bb9ab22928605d5b1c7fd44e73955.zip
driver core: Handle cycles in device links created by fw_devlink
Sometimes, firmware can have cyclic dependencies between devices. But one or more of those dependencies in the cycle are false dependencies that don't affect the probing of the device. fw_devlink can detect some of these false dependencies using logic. But when it can't, we don't want to block probing of the devices in this cyclic dependency. So, instead of using normal device links for the devices in this cycle, we need to switch to SYNC_STATE_ONLY device links between these devices. This is so that sync_state() callback correctness is still maintained while we allow these device to probe. This is functionally similar to switching to fw_devlink=permissive just for the devices in the cycle. Signed-off-by: Saravana Kannan <saravanak@google.com> Link: https://lore.kernel.org/r/20201218031703.3053753-5-saravanak@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/core.c58
1 files changed, 57 insertions, 1 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 1107d03aa6b3..4cc030361165 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1506,6 +1506,53 @@ static void fw_devlink_parse_fwtree(struct fwnode_handle *fwnode)
}
/**
+ * fw_devlink_relax_cycle - Convert cyclic links to SYNC_STATE_ONLY links
+ * @con: Device to check dependencies for.
+ * @sup: Device to check against.
+ *
+ * Check if @sup depends on @con or any device dependent on it (its child or
+ * its consumer etc). When such a cyclic dependency is found, convert all
+ * device links created solely by fw_devlink into SYNC_STATE_ONLY device links.
+ * This is the equivalent of doing fw_devlink=permissive just between the
+ * devices in the cycle. We need to do this because, at this point, fw_devlink
+ * can't tell which of these dependencies is not a real dependency.
+ *
+ * Return 1 if a cycle is found. Otherwise, return 0.
+ */
+int fw_devlink_relax_cycle(struct device *con, void *sup)
+{
+ struct device_link *link;
+ int ret;
+
+ if (con == sup)
+ return 1;
+
+ ret = device_for_each_child(con, sup, fw_devlink_relax_cycle);
+ if (ret)
+ return ret;
+
+ list_for_each_entry(link, &con->links.consumers, s_node) {
+ if ((link->flags & ~DL_FLAG_INFERRED) ==
+ (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
+ continue;
+
+ if (!fw_devlink_relax_cycle(link->consumer, sup))
+ continue;
+
+ ret = 1;
+
+ if (!(link->flags & DL_FLAG_INFERRED))
+ continue;
+
+ pm_runtime_drop_link(link);
+ link->flags = DL_FLAG_MANAGED | FW_DEVLINK_FLAGS_PERMISSIVE;
+ dev_dbg(link->consumer, "Relaxing link with %s\n",
+ dev_name(link->supplier));
+ }
+ return ret;
+}
+
+/**
* fw_devlink_create_devlink - Create a device link from a consumer to fwnode
* @con - Consumer device for the device link
* @sup_handle - fwnode handle of supplier
@@ -1536,8 +1583,17 @@ static int fw_devlink_create_devlink(struct device *con,
* If this fails, it is due to cycles in device links. Just
* give up on this link and treat it as invalid.
*/
- if (!device_link_add(con, sup_dev, flags))
+ if (!device_link_add(con, sup_dev, flags) &&
+ !(flags & DL_FLAG_SYNC_STATE_ONLY)) {
+ dev_info(con, "Fixing up cyclic dependency with %s\n",
+ dev_name(sup_dev));
+ device_links_write_lock();
+ fw_devlink_relax_cycle(con, sup_dev);
+ device_links_write_unlock();
+ device_link_add(con, sup_dev,
+ FW_DEVLINK_FLAGS_PERMISSIVE);
ret = -EINVAL;
+ }
goto out;
}