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[RFC PATCH v1 2/2] of: dynamic: Fix probing of overlay devices

Saravana Kannan posted 2 patches 1 year, 10 months ago
There is a newer version of this series
[RFC PATCH v1 2/2] of: dynamic: Fix probing of overlay devices
Posted by Saravana Kannan 1 year, 10 months ago 
Get fw_devlink to work well with overlay devices.

Signed-off-by: Saravana Kannan <saravanak@google.com>
---
 drivers/base/core.c    | 10 ++++++++++
 drivers/of/dynamic.c   |  8 ++++++++
 include/linux/fwnode.h |  2 ++
 3 files changed, 20 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 5f4e03336e68..d856f9c5d601 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -237,6 +237,16 @@ static void __fw_devlink_pickup_dangling_consumers(struct fwnode_handle *fwnode,
 		__fw_devlink_pickup_dangling_consumers(child, new_sup);
 }
 
+
+void fw_devlink_pickup_dangling_consumers(struct fwnode_handle *child,
+						 struct fwnode_handle *parent)
+{
+	mutex_lock(&fwnode_link_lock);
+	__fw_devlink_pickup_dangling_consumers(child, parent);
+	__fw_devlink_link_to_consumers(parent->dev);
+	mutex_unlock(&fwnode_link_lock);
+}
+
 static DEFINE_MUTEX(device_links_lock);
 DEFINE_STATIC_SRCU(device_links_srcu);
 
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 19a1a38554f2..0a936f46820e 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -237,6 +237,7 @@ static void __of_attach_node(struct device_node *np)
 int of_attach_node(struct device_node *np)
 {
 	struct of_reconfig_data rd;
+	struct fwnode_handle *fwnode, *parent;
 
 	memset(&rd, 0, sizeof(rd));
 	rd.dn = np;
@@ -246,6 +247,13 @@ int of_attach_node(struct device_node *np)
 	mutex_unlock(&of_mutex);
 
 	of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
+	fwnode = of_fwnode_handle(np);
+	fwnode_for_each_parent_node(fwnode, parent)
+		if (parent->dev) {
+			fw_devlink_pickup_dangling_consumers(fwnode, parent);
+			fwnode_handle_put(parent);
+			break;
+		}
 
 	return 0;
 }
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 0d79070c5a70..4b3f697a90e8 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -220,6 +220,8 @@ int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup,
 		    u8 flags);
 void fwnode_links_purge(struct fwnode_handle *fwnode);
 void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
+void fw_devlink_pickup_dangling_consumers(struct fwnode_handle *child,
+					  struct fwnode_handle *parent);
 bool fw_devlink_is_strict(void);
 
 #endif
-- 
2.44.0.478.gd926399ef9-goog
Re: [RFC PATCH v1 2/2] of: dynamic: Fix probing of overlay devices
Posted by Saravana Kannan 1 year, 10 months ago 
On Mon, Apr 8, 2024 at 4:13 PM Saravana Kannan <saravanak@google.com> wrote:
>
> Get fw_devlink to work well with overlay devices.
>
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> ---
>  drivers/base/core.c    | 10 ++++++++++
>  drivers/of/dynamic.c   |  8 ++++++++
>  include/linux/fwnode.h |  2 ++
>  3 files changed, 20 insertions(+)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index 5f4e03336e68..d856f9c5d601 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -237,6 +237,16 @@ static void __fw_devlink_pickup_dangling_consumers(struct fwnode_handle *fwnode,
>                 __fw_devlink_pickup_dangling_consumers(child, new_sup);
>  }
>
> +
> +void fw_devlink_pickup_dangling_consumers(struct fwnode_handle *child,
> +                                                struct fwnode_handle *parent)
> +{
> +       mutex_lock(&fwnode_link_lock);
> +       __fw_devlink_pickup_dangling_consumers(child, parent);
> +       __fw_devlink_link_to_consumers(parent->dev);
> +       mutex_unlock(&fwnode_link_lock);
> +}
> +
>  static DEFINE_MUTEX(device_links_lock);
>  DEFINE_STATIC_SRCU(device_links_srcu);
>
> diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
> index 19a1a38554f2..0a936f46820e 100644
> --- a/drivers/of/dynamic.c
> +++ b/drivers/of/dynamic.c
> @@ -237,6 +237,7 @@ static void __of_attach_node(struct device_node *np)
>  int of_attach_node(struct device_node *np)
>  {
>         struct of_reconfig_data rd;
> +       struct fwnode_handle *fwnode, *parent;
>
>         memset(&rd, 0, sizeof(rd));
>         rd.dn = np;
> @@ -246,6 +247,13 @@ int of_attach_node(struct device_node *np)
>         mutex_unlock(&of_mutex);
>
>         of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
> +       fwnode = of_fwnode_handle(np);
> +       fwnode_for_each_parent_node(fwnode, parent)
> +               if (parent->dev) {
> +                       fw_devlink_pickup_dangling_consumers(fwnode, parent);
> +                       fwnode_handle_put(parent);
> +                       break;
> +               }

I'm clearly calling this in the wrong location. Please move this logic
to __of_changeset_entry_notify() and for the case
OF_RECONFIG_ATTACH_NODE. Haven't fully thought through the DETACH
case, but it should work correctly for that case too. If not, I'll
take care of that next.

-Saravana

>
>         return 0;
>  }
> diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
> index 0d79070c5a70..4b3f697a90e8 100644
> --- a/include/linux/fwnode.h
> +++ b/include/linux/fwnode.h
> @@ -220,6 +220,8 @@ int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup,
>                     u8 flags);
>  void fwnode_links_purge(struct fwnode_handle *fwnode);
>  void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
> +void fw_devlink_pickup_dangling_consumers(struct fwnode_handle *child,
> +                                         struct fwnode_handle *parent);
>  bool fw_devlink_is_strict(void);
>
>  #endif
> --
> 2.44.0.478.gd926399ef9-goog
>
Re: [RFC PATCH v1 2/2] of: dynamic: Fix probing of overlay devices
Posted by Saravana Kannan 1 year, 10 months ago 
On Mon, Apr 8, 2024 at 6:40 PM Saravana Kannan <saravanak@google.com> wrote:
>
> On Mon, Apr 8, 2024 at 4:13 PM Saravana Kannan <saravanak@google.com> wrote:
> >
> > Get fw_devlink to work well with overlay devices.
> >
> > Signed-off-by: Saravana Kannan <saravanak@google.com>
> > ---
> >  drivers/base/core.c    | 10 ++++++++++
> >  drivers/of/dynamic.c   |  8 ++++++++
> >  include/linux/fwnode.h |  2 ++
> >  3 files changed, 20 insertions(+)
> >
> > diff --git a/drivers/base/core.c b/drivers/base/core.c
> > index 5f4e03336e68..d856f9c5d601 100644
> > --- a/drivers/base/core.c
> > +++ b/drivers/base/core.c
> > @@ -237,6 +237,16 @@ static void __fw_devlink_pickup_dangling_consumers(struct fwnode_handle *fwnode,
> >                 __fw_devlink_pickup_dangling_consumers(child, new_sup);
> >  }
> >
> > +
> > +void fw_devlink_pickup_dangling_consumers(struct fwnode_handle *child,
> > +                                                struct fwnode_handle *parent)
> > +{
> > +       mutex_lock(&fwnode_link_lock);
> > +       __fw_devlink_pickup_dangling_consumers(child, parent);
> > +       __fw_devlink_link_to_consumers(parent->dev);
> > +       mutex_unlock(&fwnode_link_lock);
> > +}
> > +
> >  static DEFINE_MUTEX(device_links_lock);
> >  DEFINE_STATIC_SRCU(device_links_srcu);
> >
> > diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
> > index 19a1a38554f2..0a936f46820e 100644
> > --- a/drivers/of/dynamic.c
> > +++ b/drivers/of/dynamic.c
> > @@ -237,6 +237,7 @@ static void __of_attach_node(struct device_node *np)
> >  int of_attach_node(struct device_node *np)
> >  {
> >         struct of_reconfig_data rd;
> > +       struct fwnode_handle *fwnode, *parent;
> >
> >         memset(&rd, 0, sizeof(rd));
> >         rd.dn = np;
> > @@ -246,6 +247,13 @@ int of_attach_node(struct device_node *np)
> >         mutex_unlock(&of_mutex);
> >
> >         of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
> > +       fwnode = of_fwnode_handle(np);
> > +       fwnode_for_each_parent_node(fwnode, parent)
> > +               if (parent->dev) {
> > +                       fw_devlink_pickup_dangling_consumers(fwnode, parent);
> > +                       fwnode_handle_put(parent);
> > +                       break;
> > +               }
>
> I'm clearly calling this in the wrong location. Please move this logic
> to __of_changeset_entry_notify() and for the case
> OF_RECONFIG_ATTACH_NODE. Haven't fully thought through the DETACH
> case, but it should work correctly for that case too. If not, I'll
> take care of that next.
>

I'll send out a RFC v2 with the code fixed up in a few minutes.

> -Saravana
>
> >
> >         return 0;
> >  }
> > diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
> > index 0d79070c5a70..4b3f697a90e8 100644
> > --- a/include/linux/fwnode.h
> > +++ b/include/linux/fwnode.h
> > @@ -220,6 +220,8 @@ int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup,
> >                     u8 flags);
> >  void fwnode_links_purge(struct fwnode_handle *fwnode);
> >  void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
> > +void fw_devlink_pickup_dangling_consumers(struct fwnode_handle *child,
> > +                                         struct fwnode_handle *parent);
> >  bool fw_devlink_is_strict(void);
> >
> >  #endif
> > --
> > 2.44.0.478.gd926399ef9-goog
> >

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