firewire: core: add tracepoints events for setting channels of multichannel context

It is helpful to trace the channel setting for the multichannel isochronous
context when the core function is requested it by both in-kernel unit
drivers and userspace applications.

This commit adds some tracepoints events for the aim.

Link: https://lore.kernel.org/r/20240623220859.851685-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index ddb999297c72c4368703043d4990e5c1751713b8..7ec84de846e608229be33307eadc75c6e7ad2c5e 100644 (file)
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -177,6 +177,8 @@ EXPORT_SYMBOL(fw_iso_context_start);
 
 int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)
 {
+       trace_isoc_inbound_multiple_channels(ctx, *channels);
+
        return ctx->card->driver->set_iso_channels(ctx, channels);
 }
 

diff --git a/include/trace/events/firewire.h b/include/trace/events/firewire.h
index 0cca1ef841f3568eafad33be636665cbd008462f..0334e02f9d9424f330c0720a74c6c598d6eac75e 100644 (file)
--- a/include/trace/events/firewire.h
+++ b/include/trace/events/firewire.h
@@ -541,6 +541,27 @@ DEFINE_EVENT_CONDITION(isoc_destroy_template, isoc_inbound_multiple_destroy,
        TP_CONDITION(ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL)
 );
 
+TRACE_EVENT(isoc_inbound_multiple_channels,
+       TP_PROTO(const struct fw_iso_context *ctx, u64 channels),
+       TP_ARGS(ctx, channels),
+       TP_STRUCT__entry(
+               __field(u64, context)
+               __field(u8, card_index)
+               __field(u64, channels)
+       ),
+       TP_fast_assign(
+               __entry->context = (uintptr_t)ctx;
+               __entry->card_index = ctx->card->index;
+               __entry->channels = channels;
+       ),
+       TP_printk(
+               "context=0x%llx card_index=%u channels=0x%016llx",
+               __entry->context,
+               __entry->card_index,
+               __entry->channels
+       )
+);
+
 #undef QUADLET_SIZE
 
 #endif // _FIREWIRE_TRACE_EVENT_H