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Commit ab0592b9 authored by Don Zickus's avatar Don Zickus Committed by Greg Kroah-Hartman
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staging: unisys: Add visor device find routine 



If we are going to remove the bus_info structs than we need a way
to find the devices when the *_create/destroy cmds are sent over
the vmchannel.

This function crudely impements what pci has.  It takes a bus_no
and dev_no and finds the matching 'struct visor_device'.

This function can/should be optimzed later once we get our heads
wrapped around its needs.  For now, I am using dev_no=0 to mean
the visorbus itself.

The function is limited to chipset.c only because it is only needed
to do the lookups upon receiving a vmchannel command.  Future patches
will make sure the resulting 'struct visor_device' is used every
where else.

Also allow visorbus_type to be more visible for use.

Signed-off-by: default avatarDon Zickus <dzickus@redhat.com>
Signed-off-by: default avatarBenjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1fb3016e

drivers/staging/unisys/visorbus/visorchipset.c

+39 −0
Original line number Diff line number Diff line
@@ -711,6 +711,45 @@ dev_info_clear(void *v) 
	memset(p, 0, sizeof(struct visorchipset_device_info));

}



struct visor_busdev {

	u32 bus_no;

	u32 dev_no;

};



static int match_visorbus_dev_by_id(struct device *dev, void *data)

{

	struct visor_device *vdev = to_visor_device(dev);

	struct visor_busdev *id = (struct visor_busdev *)data;

	u32 bus_no = id->bus_no;

	u32 dev_no = id->dev_no;



	if (((bus_no == -1) || (vdev->chipset_bus_no == bus_no)) &&

	    ((dev_no == -1) || (vdev->chipset_dev_no == dev_no)))

		return 1;



	return 0;

}

struct visor_device *visorbus_get_device_by_id(u32 bus_no, u32 dev_no,

					       struct visor_device *from)

{

	struct device *dev;

	struct device *dev_start = NULL;

	struct visor_device *vdev = NULL;

	struct visor_busdev id = {

			.bus_no = bus_no,

			.dev_no = dev_no

		};



	if (from)

		dev_start = &from->device;

	dev = bus_find_device(&visorbus_type, dev_start, (void *)&id,

			      match_visorbus_dev_by_id);

	if (dev)

		vdev = to_visor_device(dev);

	return vdev;

}

EXPORT_SYMBOL(visorbus_get_device_by_id);



static struct visorchipset_bus_info *

bus_find(struct list_head *list, u32 bus_no)

{