Add a tracepoint in the residual update instead of using dev_dbg() to allow debugging via the trace pipe. Signed-off-by: Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx> --- Fixes since v1: - copy the devname instead of referencing the dmachan device Cc: Ingo Molnar <mingo@xxxxxxxxxx> (maintainer:TRACING) Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> (maintainer:TRACING) --- drivers/dma/tegra20-apb-dma.c | 5 ++--- include/trace/events/tegra_apb_dma.h | 27 +++++++++++++++++++++++++++ 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 22114c9a6e98..211efea67db6 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -886,9 +886,8 @@ static unsigned int tegra_dma_update_residual(struct tegra_dma_channel *tdc, } done: - dev_dbg(tdc2dev(tdc), "residual: req %08lx, ahb@%08lx, wcount %08lx, done %d\n", - sg_req->ch_regs.ahb_ptr, ahbptr, wcount, done); - + trace_tegra_dma_tx_state(&tdc->dma_chan, ahbptr, status, result, + tmp, residual); return result; } diff --git a/include/trace/events/tegra_apb_dma.h b/include/trace/events/tegra_apb_dma.h index 1f55c2c6049d..8fa0f0974828 100644 --- a/include/trace/events/tegra_apb_dma.h +++ b/include/trace/events/tegra_apb_dma.h @@ -41,6 +41,33 @@ TRACE_EVENT(tegra_dma_complete_cb, __get_str(chan), __entry->count, __entry->ptr) ); +TRACE_EVENT(tegra_dma_tx_state, + TP_PROTO(struct dma_chan *dc, unsigned long ahb, + unsigned long wc, unsigned int done, + unsigned long byte_count, unsigned int residual), + TP_ARGS(dc, ahb, wc, done, byte_count, residual), + TP_STRUCT__entry( + __string(chan, 16) + __field(unsigned long, ahb) + __field(unsigned long, wc) + __field(unsigned long, done) + __field(unsigned int, residual) + __field(unsigned long, byte_count) + ), + TP_fast_assign( + __assign_str(chan, dev_name(&dc->dev->device)); + __entry->ahb = ahb; + __entry->wc = wc; + __entry->done = done; + __entry->residual = residual; + __entry->byte_count = byte_count; + ), + TP_printk("%s: txresidual: ahb %08lx wc %08lx => done %lu bc %lu residual %u", + __get_str(chan), + __entry->ahb, __entry->wc, __entry->done, + __entry->byte_count, __entry->residual) +); + TRACE_EVENT(tegra_dma_isr, TP_PROTO(struct dma_chan *dc, int irq), TP_ARGS(dc, irq), -- 2.19.1