Last year I try to add trace event support for usb gadget configfs [1],
this time the idea is change a lot, the purpose is trace all user space
operation to gadget configuration, include gadget and it's function.
In usb gadget configfs, mainly user can do mkdir/rmdir a group,
link/unlink a function, change gadget/function attributes,
each operation will touch a struct config_item.
It only have one trace event entry which store string,
provide several API which represent user operation and generate string
from struct config_item.
example output,
mkdir-80 [000] ..... 44.555106: gadget_configfs: mkdir dummy
sh-76 [000] ..... 44.562609: gadget_configfs: echo dummy/idVendor 0x05C6
mkdir-81 [000] ..... 44.569795: gadget_configfs: mkdir dummy/functions/eem.0
sh-76 [000] ..... 44.600221: gadget_configfs: echo dummy/functions/eem.0/dev_addr 1e:77:46:4b:1e:96
mkdir-82 [000] ..... 44.615542: gadget_configfs: mkdir dummy/configs/dummy.1
ln-83 [000] ..... 44.628997: gadget_configfs: link dummy/configs/dummy.1 dummy/functions/eem.0
sh-76 [000] ..... 44.634506: gadget_configfs: echo dummy/configs/dummy.1/MaxPower 500
mkdir-84 [000] ..... 44.642265: gadget_configfs: mkdir dummy/configs/dummy.1/strings/0x409
sh-76 [000] ..... 44.663886: gadget_configfs: echo dummy/configs/dummy.1/strings/0x409/configuration dummy
rmdir-85 [000] ..... 64.255507: gadget_configfs: rmdir dummy/configs/dummy.1/strings/0x409
rm-86 [000] ..... 64.263926: gadget_configfs: unlink dummy/configs/dummy.1 dummy/functions/eem.0
rmdir-87 [000] ..... 64.279768: gadget_configfs: rmdir dummy/configs/dummy.1
rmdir-88 [000] ..... 64.328124: gadget_configfs: rmdir dummy/functions/eem.0
rmdir-89 [000] ..... 64.992085: gadget_configfs: rmdir dummy
As it is different from last year change, start a new thread.
[1] https://lore.kernel.org/linux-usb/1635229309-2821-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/
V2: add example output
V3: add trace.c and move all APIs to it
v4: fix memory leak in v3
v5: change return value report by kernel test robot <lkp@xxxxxxxxx> and
Dan Carpenter <dan.carpenter@xxxxxxxxxx>
v6: fix checkpatch warning
Linyu Yuan (5):
usb: gadget: remove gadgets_type storage type 'static'
usb: gadget: add trace event of configfs operation
usb: gadget: add trace event of configfs group operation
usb: gadget: add trace event of configfs link/unlink operation
usb: gadget: add trace event of configfs write attributes operation
drivers/usb/gadget/Makefile | 2 +
drivers/usb/gadget/configfs.c | 45 ++++++-
drivers/usb/gadget/function/f_acm.c | 1 +
drivers/usb/gadget/function/f_hid.c | 4 +
drivers/usb/gadget/function/f_loopback.c | 4 +
drivers/usb/gadget/function/f_mass_storage.c | 20 +++
drivers/usb/gadget/function/f_midi.c | 6 +
drivers/usb/gadget/function/f_printer.c | 4 +
drivers/usb/gadget/function/f_serial.c | 1 +
drivers/usb/gadget/function/f_sourcesink.c | 16 +++
drivers/usb/gadget/function/f_uac1.c | 6 +
drivers/usb/gadget/function/f_uac1_legacy.c | 4 +
drivers/usb/gadget/function/f_uac2.c | 8 ++
drivers/usb/gadget/function/u_ether_configfs.h | 10 ++
drivers/usb/gadget/function/uvc_configfs.c | 42 +++++++
drivers/usb/gadget/trace.c | 163 +++++++++++++++++++++++++
drivers/usb/gadget/trace.h | 39 ++++++
include/linux/usb/composite.h | 18 +++
include/linux/usb/gadget_configfs.h | 4 +
19 files changed, 396 insertions(+), 1 deletion(-)
create mode 100644 drivers/usb/gadget/trace.c
create mode 100644 drivers/usb/gadget/trace.h
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2.7.4
