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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: Don Zickus <dzickus@redhat.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Don Zickus 2015-05-13 13:22:19 -04:00 committed by Greg Kroah-Hartman
parent 1fb3016eab
commit ab0592b9fb
1 changed files with 39 additions and 0 deletions
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39
drivers/staging/unisys/visorbus/visorchipset.c
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@ -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)
{