illumos gate

Manual testing details:

Invoke mdb with the -L option to force it to load mdb plugins from my illumos-gate repo.

# mdb -L ~rejohnst/ws/illumos-upstream1/proto/root_i386/usr/lib/mdb/proc /usr/lib/fm/fmd/fmtopo
> 

Verify that the new topo_list walker exits:

> ::bp walk_topo
> ::run
mdb: stop at walk_topo
mdb: target stopped at:
walk_topo:      pushl  %ebp
mdb: You've got symbols!
Loading modules: [ ld.so.1 libc.so.1 libtopo.so.1 libumem.so.1 libnvpair.so.1 libuutil.so.1 libavl.so.1 libcmdutils.so.1 libsysevent.so.1 ]
> ::walkers ! grep topo_list
topo_list                - walk a topo_list_t linked list

Find a tnode_t with some non-empty topo_list_t structs and dump them with the topo_list walker::

> 900bf40::fmtopo -v ! grep tnode_t | tail -3
  tnode_t: 91bb438
  tnode_t: 91bb678
  tnode_t: 91bb2b8

> 91bb438::print -at tnode_t ! grep topo_list
    91bb470 topo_list_t tn_children = {
        91bb470 struct topo_list *l_prev = 0x91cf800
        91bb474 struct topo_list *l_next = 0x91cf820
    91bb478 topo_list_t tn_pgroups = {
        91bb478 struct topo_list *l_prev = 0x91d7c78
        91bb47c struct topo_list *l_next = 0x91d7df8
    91bb480 topo_list_t tn_methods = {
        91bb480 struct topo_list *l_prev = 0x91d6ca8
        91bb484 struct topo_list *l_next = 0x91d6cf8

> 91bb478::walk topo_list | ::print topo_pgroup_t tpg_info | ::print -t topo_ipgroup_info_t
topo_ipgroup_info_t {
    char *tpi_name = 0x91d4c80 "protocol" 
    topo_stability_t tpi_namestab = 2 (TOPO_STABILITY_PRIVATE)
    topo_stability_t tpi_datastab = 2 (TOPO_STABILITY_PRIVATE)
    topo_version_t tpi_version = 0x1
}
topo_ipgroup_info_t {
    char *tpi_name = 0x91d4c40 "authority" 
    topo_stability_t tpi_namestab = 2 (TOPO_STABILITY_PRIVATE)
    topo_stability_t tpi_datastab = 2 (TOPO_STABILITY_PRIVATE)
    topo_version_t tpi_version = 0x1
}
topo_ipgroup_info_t {
    char *tpi_name = 0x91bfce8 "io" 
    topo_stability_t tpi_namestab = 2 (TOPO_STABILITY_PRIVATE)
    topo_stability_t tpi_datastab = 2 (TOPO_STABILITY_PRIVATE)
    topo_version_t tpi_version = 0x1
}
topo_ipgroup_info_t {
    char *tpi_name = 0x91bfcd8 "pci" 
    topo_stability_t tpi_namestab = 2 (TOPO_STABILITY_PRIVATE)
    topo_stability_t tpi_datastab = 2 (TOPO_STABILITY_PRIVATE)
    topo_version_t tpi_version = 0x1
}

> 91bb480::walk topo_list | ::print topo_imethod_t tim_name
tim_name = 0x91d4c00 "topo_label" 
tim_name = 0x91d7dc8 "topo_fru_compute" 

Try walking an empty list:

> 906e368::print -at tnode_t tn_children
906e3a0 topo_list_t tn_children = {
    906e3a0 struct topo_list *tn_children.l_prev = 0
    906e3a4 struct topo_list *tn_children.l_next = 0
}
> 906e3a0::walk topo_list
> 

Try passing something that is not a topo_list to the walker:

> 906e398::walk topo_list
0x9011d28
mdb: failed to read topo_list_t at 4d580000: no mapping for address