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dmaengine: tegra: add tracepoints to driver

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Add some trace-points to the driver to allow for debuging via the
trace pipe.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Ben Dooks 2018-11-21 16:13:23 +00:00 • committed by Vinod Koul
parent 65c383c780
commit 95f295f9fe
2 changed files with 68 additions and 0 deletions
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7
drivers/dma/tegra20-apb-dma.c
View file

@ -38,6 +38,9 @@
#include "dmaengine.h"
#define CREATE_TRACE_POINTS
#include <trace/events/tegra_apb_dma.h>
#define TEGRA_APBDMA_GENERAL 0x0
#define TEGRA_APBDMA_GENERAL_ENABLE BIT(31)
@ -672,6 +675,8 @@ static void tegra_dma_tasklet(unsigned long data)
dmaengine_desc_get_callback(&dma_desc->txd, &cb);
cb_count = dma_desc->cb_count;
dma_desc->cb_count = 0;
trace_tegra_dma_complete_cb(&tdc->dma_chan, cb_count,
cb.callback);
spin_unlock_irqrestore(&tdc->lock, flags);
while (cb_count--)
dmaengine_desc_callback_invoke(&cb, NULL);
@ -688,6 +693,7 @@ static irqreturn_t tegra_dma_isr(int irq, void *dev_id)
spin_lock_irqsave(&tdc->lock, flags);
trace_tegra_dma_isr(&tdc->dma_chan, irq);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
if (status & TEGRA_APBDMA_STATUS_ISE_EOC) {
tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status);
@ -846,6 +852,7 @@ found:
dma_set_residue(txstate, residual);
}
trace_tegra_dma_tx_status(&tdc->dma_chan, cookie, txstate);
spin_unlock_irqrestore(&tdc->lock, flags);
return ret;
}

61
include/trace/events/tegra_apb_dma.h Normal file
View file

@ -0,0 +1,61 @@
#if !defined(_TRACE_TEGRA_APB_DMA_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_TEGRA_APM_DMA_H
#include <linux/tracepoint.h>
#include <linux/dmaengine.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM tegra_apb_dma
TRACE_EVENT(tegra_dma_tx_status,
TP_PROTO(struct dma_chan *dc, dma_cookie_t cookie, struct dma_tx_state *state),
TP_ARGS(dc, cookie, state),
TP_STRUCT__entry(
__string(chan, dev_name(&dc->dev->device))
__field(dma_cookie_t, cookie)
__field(__u32, residue)
),
TP_fast_assign(
__assign_str(chan, dev_name(&dc->dev->device));
__entry->cookie = cookie;
__entry->residue = state ? state->residue : (u32)-1;
),
TP_printk("channel %s: dma cookie %d, residue %u",
__get_str(chan), __entry->cookie, __entry->residue)
);
TRACE_EVENT(tegra_dma_complete_cb,
TP_PROTO(struct dma_chan *dc, int count, void *ptr),
TP_ARGS(dc, count, ptr),
TP_STRUCT__entry(
__string(chan, dev_name(&dc->dev->device))
__field(int, count)
__field(void *, ptr)
),
TP_fast_assign(
__assign_str(chan, dev_name(&dc->dev->device));
__entry->count = count;
__entry->ptr = ptr;
),
TP_printk("channel %s: done %d, ptr %p",
__get_str(chan), __entry->count, __entry->ptr)
);
TRACE_EVENT(tegra_dma_isr,
TP_PROTO(struct dma_chan *dc, int irq),
TP_ARGS(dc, irq),
TP_STRUCT__entry(
__string(chan, dev_name(&dc->dev->device))
__field(int, irq)
),
TP_fast_assign(
__assign_str(chan, dev_name(&dc->dev->device));
__entry->irq = irq;
),
TP_printk("%s: irq %d\n", __get_str(chan), __entry->irq)
);
#endif /* _TRACE_TEGRADMA_H */
/* This part must be outside protection */
#include <trace/define_trace.h>