dmaengine: tegra: add tracepoints to driver

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>

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index c60c3f7..659b49b 100644 (file)
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -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;
 }

diff --git a/include/trace/events/tegra_apb_dma.h b/include/trace/events/tegra_apb_dma.h
new file mode 100644 (file)
index 0000000..0818f62
--- /dev/null
+++ b/include/trace/events/tegra_apb_dma.h
@@ -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>