Messages in this thread | | | From | Takashi Sakamoto <> | Subject | [RFC PATCH 00/13] firewire: add tracepoints events for asynchronous communication | Date | Thu, 18 Apr 2024 18:22:50 +0900 |
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Hi,
In a view of IEEE 1394 bus, the main function of kernel core is to provide transaction service to the bus. It is helpful to have some mechanisms to trace any action of the service.
This series of changes adds some tracepoints events for the purpose. It adds the following tracepoints events via firewire subsystem:
* For outbound transactions (e.g. initiated by user process) * async_request_outbound_initiate * async_request_outbound_complete * async_response_inbound * For inbound transactions (e.g. initiated by the other nodes in the bus) * async_request_inbound * async_response_outbound_initiate * async_response_outbound_complete
When probing these tracepoints events, the content of 'struct fw_packet' passed between the core function and 1394 OHCI driver is recorded with the fields of header and packet data. For example of the outbound transaction:
async_request_outbound_initiate: \ transaction=0xffffb7e382373718 scode=2 generation=6 dst_id=0xffc0 \ tlabel=59 retry=1 tcode=1 priority=0 src_id=0xffc1 \ offset=0xecc000000000 \ data={0x6000000,0x1000000,0x40000100,0x3000000,0x1000000,0x0} async_request_outbound_complete: \ transaction=0xffffb7e382373718 scode=2 generation=6 ack=2 \ timestamp=0x2296 async_response_inbound: \ transaction=0xffffb7e382373718 scode=2 timestamp=0x2297 dst_id=0xffc1 \ tlabel=59 retry=1 tcode=2 priority=0 src_id=0xffc0 rcode=0 data={}
To provide the parsed fields of header, the series adds some helper incline functions for this purpose, then refactors the existent code in both core and 1394 OHCI driver with sufficient tests.
Takashi Sakamoto (13): firewire: core: add common inline functions to serialize/deserialize asynchronous packet header firewire: core: replace local macros with common inline functions for asynchronous packet header firewire: ohci: replace local macros with common inline functions for asynchronous packet header firewire: ohci: replace hard-coded values with inline functions for asynchronous packet header firewire: ohci: replace hard-coded values with common macros firewire: core: obsolete tcode check macros with inline functions firewire: core: add common macro to serialize/deserialize isochronous packet header firewire: core: replace local macros with common inline functions for isochronous packet header firewire: core: add support for Linux kernel tracepoints firewire: core: add tracepoints events for asynchronous outbound request firewire: core: add tracepoints event for asynchronous inbound response firewire: core: add tracepoint event for asynchronous inbound request firewire: core: add tracepoints events for asynchronous outbound response
drivers/firewire/.kunitconfig | 1 + drivers/firewire/Kconfig | 16 + drivers/firewire/Makefile | 8 +- drivers/firewire/core-transaction.c | 239 ++++---- drivers/firewire/core.h | 21 +- drivers/firewire/ohci.c | 78 +-- drivers/firewire/packet-header-definitions.h | 234 ++++++++ drivers/firewire/packet-serdes-test.c | 582 +++++++++++++++++++ drivers/firewire/trace.c | 5 + drivers/firewire/trace.h | 265 +++++++++ 10 files changed, 1280 insertions(+), 169 deletions(-) create mode 100644 drivers/firewire/packet-header-definitions.h create mode 100644 drivers/firewire/packet-serdes-test.c create mode 100644 drivers/firewire/trace.c create mode 100644 drivers/firewire/trace.h
-- 2.43.0
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