forked from Minki/linux
02bd88b483
Instructions and examples on kernel data structures dumping and coredump. Signed-off-by: Coiby Xu <coiby.xu@gmail.com> Link: https://lore.kernel.org/r/20210123104613.38359-9-coiby.xu@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
4.2 KiB
ReStructuredText
119 lines
4.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
=======================================
|
|
QLogic QLGE 10Gb Ethernet device driver
|
|
=======================================
|
|
|
|
This driver use drgn and devlink for debugging.
|
|
|
|
Dump kernel data structures in drgn
|
|
-----------------------------------
|
|
|
|
To dump kernel data structures, the following Python script can be used
|
|
in drgn:
|
|
|
|
.. code-block:: python
|
|
|
|
def align(x, a):
|
|
"""the alignment a should be a power of 2
|
|
"""
|
|
mask = a - 1
|
|
return (x+ mask) & ~mask
|
|
|
|
def struct_size(struct_type):
|
|
struct_str = "struct {}".format(struct_type)
|
|
return sizeof(Object(prog, struct_str, address=0x0))
|
|
|
|
def netdev_priv(netdevice):
|
|
NETDEV_ALIGN = 32
|
|
return netdevice.value_() + align(struct_size("net_device"), NETDEV_ALIGN)
|
|
|
|
name = 'xxx'
|
|
qlge_device = None
|
|
netdevices = prog['init_net'].dev_base_head.address_of_()
|
|
for netdevice in list_for_each_entry("struct net_device", netdevices, "dev_list"):
|
|
if netdevice.name.string_().decode('ascii') == name:
|
|
print(netdevice.name)
|
|
|
|
ql_adapter = Object(prog, "struct ql_adapter", address=netdev_priv(qlge_device))
|
|
|
|
The struct ql_adapter will be printed in drgn as follows,
|
|
|
|
>>> ql_adapter
|
|
(struct ql_adapter){
|
|
.ricb = (struct ricb){
|
|
.base_cq = (u8)0,
|
|
.flags = (u8)120,
|
|
.mask = (__le16)26637,
|
|
.hash_cq_id = (u8 [1024]){ 172, 142, 255, 255 },
|
|
.ipv6_hash_key = (__le32 [10]){},
|
|
.ipv4_hash_key = (__le32 [4]){},
|
|
},
|
|
.flags = (unsigned long)0,
|
|
.wol = (u32)0,
|
|
.nic_stats = (struct nic_stats){
|
|
.tx_pkts = (u64)0,
|
|
.tx_bytes = (u64)0,
|
|
.tx_mcast_pkts = (u64)0,
|
|
.tx_bcast_pkts = (u64)0,
|
|
.tx_ucast_pkts = (u64)0,
|
|
.tx_ctl_pkts = (u64)0,
|
|
.tx_pause_pkts = (u64)0,
|
|
...
|
|
},
|
|
.active_vlans = (unsigned long [64]){
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 52780853100545, 18446744073709551615,
|
|
18446619461681283072, 0, 42949673024, 2147483647,
|
|
},
|
|
.rx_ring = (struct rx_ring [17]){
|
|
{
|
|
.cqicb = (struct cqicb){
|
|
.msix_vect = (u8)0,
|
|
.reserved1 = (u8)0,
|
|
.reserved2 = (u8)0,
|
|
.flags = (u8)0,
|
|
.len = (__le16)0,
|
|
.rid = (__le16)0,
|
|
...
|
|
},
|
|
.cq_base = (void *)0x0,
|
|
.cq_base_dma = (dma_addr_t)0,
|
|
}
|
|
...
|
|
}
|
|
}
|
|
|
|
coredump via devlink
|
|
--------------------
|
|
|
|
|
|
And the coredump obtained via devlink in json format looks like,
|
|
|
|
.. code:: shell
|
|
|
|
$ devlink health dump show DEVICE reporter coredump -p -j
|
|
{
|
|
"Core Registers": {
|
|
"segment": 1,
|
|
"values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
|
|
},
|
|
"Test Logic Regs": {
|
|
"segment": 2,
|
|
"values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
|
|
},
|
|
"RMII Registers": {
|
|
"segment": 3,
|
|
"values": [ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ]
|
|
},
|
|
...
|
|
"Sem Registers": {
|
|
"segment": 50,
|
|
"values": [ 0,0,0,0 ]
|
|
}
|
|
}
|
|
|
|
When the module parameter qlge_force_coredump is set to be true, the MPI
|
|
RISC reset before coredumping. So coredumping will much longer since
|
|
devlink tool has to wait for 5 secs for the resetting to be
|
|
finished.
|