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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2024-07-03 07:20:34 +0900 |
|---|---|---|
| committer | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2024-07-04 09:07:14 +0900 |
| commit | 526e21a2aa6fa7ac3309a8c87f4d6e5f7e407cb6 (patch) | |
| tree | be4b5a48da57e79147ecd19d59c3a76597aaf38e /drivers/firewire | |
| parent | 4a13617ef311cb01160bdecfa338e2148940059c (diff) | |
firewire: ohci: add tracepoints event for data of Self-ID DMA
In 1394 OHCI, the SelfIDComplete event occurs when the hardware has
finished transmitting all of the self ID packets received during the bus
initialization process to the host memory by DMA.
This commit adds a tracepoints event for this event to trace the timing
and packet data of Self-ID DMA. It is the part of following tracepoints
events helpful to debug some events at bus reset; e.g. the issue addressed
at a commit d0b06dc48fb1 ("firewire: core: use long bus reset on gap count
error")[1]:
* firewire_ohci:irqs
* firewire_ohci:self_id_complete
* firewire:bus_reset_handle
* firewire:self_id_sequence
They would be also helpful in the problem about invocation timing of
hardIRQ and process (workqueue) contexts. We can often see this kind of
problem with -rt kernel[2].
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d0b06dc48fb1
[2] https://lore.kernel.org/linux-rt-users/YAwPoaUZ1gTD5y+k@hmbx/
Link: https://lore.kernel.org/r/20240702222034.1378764-6-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/ohci.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index c95f26c74e2b..f8d880574c19 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -45,6 +45,8 @@ #include <trace/events/firewire.h> +static u32 cond_le32_to_cpu(__le32 value, bool has_be_header_quirk); + #define CREATE_TRACE_POINTS #include <trace/events/firewire_ohci.h> @@ -2208,8 +2210,15 @@ static irqreturn_t irq_handler(int irq, void *data) if (event & OHCI1394_busReset) reg_write(ohci, OHCI1394_IntMaskClear, OHCI1394_busReset); - if (event & OHCI1394_selfIDComplete) + if (event & OHCI1394_selfIDComplete) { + if (trace_self_id_complete_enabled()) { + u32 reg = reg_read(ohci, OHCI1394_SelfIDCount); + + trace_self_id_complete(ohci->card.index, reg, ohci->self_id, + has_be_header_quirk(ohci)); + } queue_work(selfid_workqueue, &ohci->bus_reset_work); + } if (event & OHCI1394_RQPkt) tasklet_schedule(&ohci->ar_request_ctx.tasklet); |