linux-kernel - Re: [PATCH 0/5] firewire: add tracepoints events for asynchronous transaction

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Date: Tue, 30 Apr 2024 08:03:27 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] firewire: add tracepoints events for asynchronous
 transaction

On Mon, Apr 29, 2024 at 01:32:13PM +0900, Takashi Sakamoto wrote:
> Hi,
> 
> The series of changes in this patchse is to revise the previous RFC:
> https://lore.kernel.org/lkml/20240418092303.19725-1-o-takashi@sakamocchi.jp/
> 
> 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
> split transaction:
> 
> async_request_outbound_initiate: \
>     transaction=0xffff955fc6a07b30 generation=5 scode=2 dst_id=0xffc0 \
>     tlabel=18 tcode=9 src_id=0xffc1 offset=0xfffff0000984 \
>     header={0xffc04990,0xffc1ffff,0xf0000984,0x80002} data={0x81,0x80}
> async_request_outbound_complete: \
>     transaction=0xffff955fc6a07b30 generation=5 scode=2 status=2 \
>     timestamp=0xeabf
> async_response_inbound: \
>     transaction=0xffff955fc6a07b30 generation=5 scode=2 status=1 \
>     timestamp=0xeac2 dst_id=0xffc1 tlabel=18 tcode=11 src_id=0xffc0 \
>     rcode=0 header={0xffc149b0,0xffc00000,0x0,0x40002} data={0x81}
> 
> Takashi Sakamoto (5):
>   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/Makefile           |   2 +-
>  drivers/firewire/core-trace.c       |   5 +
>  drivers/firewire/core-transaction.c |  93 +++++++-----
>  include/trace/events/firewire.h     | 211 ++++++++++++++++++++++++++++
>  4 files changed, 276 insertions(+), 35 deletions(-)
>  create mode 100644 drivers/firewire/core-trace.c
>  create mode 100644 include/trace/events/firewire.h

Applied to for-next branch.


Regards

Takashi Sakamoto