From: Don Zickus <dzickus@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Benjamin Romer <benjamin.romer@xxxxxxxxxx>
---
drivers/staging/unisys/visorbus/visorchipset.c | 39 ++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index b96a40c..42bf02a 100644
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -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)
{
--
2.1.4
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