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> 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 | 40 ++++++ include/linux/usb/composite.h | 18 +++ include/linux/usb/gadget_configfs.h | 4 + 19 files changed, 397 insertions(+), 1 deletion(-) create mode 100644 drivers/usb/gadget/trace.c create mode 100644 drivers/usb/gadget/trace.h -- 2.7.4