Commit 19d0f5f6 authored by Saravana Kannan's avatar Saravana Kannan Committed by Greg Kroah-Hartman
Browse files

driver core: Add fw_devlink.strict kernel param 



This param allows forcing all dependencies to be treated as mandatory.
This will be useful for boards in which all optional dependencies like
IOMMUs and DMAs need to be treated as mandatory dependencies.

Tested-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarSaravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210205222644.2357303-4-saravanak@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1753c4d1

Documentation/admin-guide/kernel-parameters.txt

+5 −0
Original line number Diff line number Diff line
@@ -1433,6 +1433,11 @@ 
				to enforce probe and suspend/resume ordering.

			rpm --	Like "on", but also use to order runtime PM.



	fw_devlink.strict=<bool>

			[KNL] Treat all inferred dependencies as mandatory

			dependencies. This only applies for fw_devlink=on|rpm.

			Format: <bool>



	gamecon.map[2|3]=

			[HW,JOY] Multisystem joystick and NES/SNES/PSX pad

			support via parallel port (up to 5 devices per port)

drivers/base/core.c

+12 −0
Original line number Diff line number Diff line
@@ -1521,6 +1521,13 @@ static int __init fw_devlink_setup(char *arg) 
}

early_param("fw_devlink", fw_devlink_setup);



static bool fw_devlink_strict;

static int __init fw_devlink_strict_setup(char *arg)

{

	return strtobool(arg, &fw_devlink_strict);

}

early_param("fw_devlink.strict", fw_devlink_strict_setup);



u32 fw_devlink_get_flags(void)

{

	return fw_devlink_flags;
@@ -1531,6 +1538,11 @@ static bool fw_devlink_is_permissive(void) 
	return fw_devlink_flags == FW_DEVLINK_FLAGS_PERMISSIVE;

}



bool fw_devlink_is_strict(void)

{

	return fw_devlink_strict && !fw_devlink_is_permissive();

}



static void fw_devlink_parse_fwnode(struct fwnode_handle *fwnode)

{

	if (fwnode->flags & FWNODE_FLAG_LINKS_ADDED)

include/linux/fwnode.h

+1 −0
Original line number Diff line number Diff line
@@ -162,6 +162,7 @@ static inline void fwnode_init(struct fwnode_handle *fwnode, 
}



extern u32 fw_devlink_get_flags(void);

extern bool fw_devlink_is_strict(void);

int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);

void fwnode_links_purge(struct fwnode_handle *fwnode);