blob: e3a87dda931d3ef116f2d3c32308753769887e56 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
#ifndef _IEEE1394_GUID_H
#define _IEEE1394_GUID_H
/*
* General information: Finding out which GUID belongs to which node is done by
* sending packets and therefore waiting for the answers. Wherever it is
* mentioned that a node is inaccessible this could just as well mean that we
* just don't know yet (usually, bus reset handlers can't rely on GUIDs being
* associated with current nodes).
*/
struct guid_entry;
typedef struct guid_entry *hpsb_guid_t;
/*
* Returns a guid handle (which has its reference count incremented) or NULL if
* there is the GUID in question is not known of. Getting a valid handle does
* not mean that the node with this GUID is currently accessible (might not be
* plugged in or powered down).
*/
hpsb_guid_t hpsb_guid_get_handle(u64 guid);
/*
* If the handle refers to a local host, this function will return the pointer
* to the hpsb_host structure. It will return NULL otherwise. Once you have
* established it is a local host, you can use that knowledge from then on (the
* GUID won't wander to an external node).
*
* Note that the local GUID currently isn't collected, so this will always
* return NULL.
*/
struct hpsb_host *hpsb_guid_localhost(hpsb_guid_t handle);
/*
* This will fill in the given, pre-initialised hpsb_packet with the current
* information from the GUID handle (host, node ID, generation number). It will
* return false if the node owning the GUID is not accessible (and not modify the
* hpsb_packet) and return true otherwise.
*
* Note that packet sending may still fail in hpsb_send_packet if a bus reset
* happens while you are trying to set up the packet (due to obsolete generation
* number). It will at least reliably fail so that you don't accidentally and
* unknowingly send your packet to the wrong node.
*/
int hpsb_guid_fill_packet(hpsb_guid_t handle, struct hpsb_packet *pkt);
void init_ieee1394_guid(void);
#endif /* _IEEE1394_GUID_H */
|
