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Subject[PATCH v1 4/4] coresight: etb10: hook panic callback
Date
This patch is to hook panic callback for etb10 driver; so after panic
can dump trace data from it.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
drivers/hwtracing/coresight/coresight-etb10.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 979ea6e..c9ea281 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -473,6 +473,21 @@ static void etb_update_buffer(struct coresight_device *csdev,
CS_LOCK(drvdata->base);
}

+static int etb_panic_cb(struct coresight_device *csdev)
+{
+ struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ unsigned long flags;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+ etb_disable_hw(drvdata);
+ etb_dump_hw(drvdata);
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+ dev_err(drvdata->dev, "Dump ETB buffer 0x%x@0x%p\n",
+ drvdata->buffer_depth, drvdata->buf);
+ return 0;
+}
+
static const struct coresight_ops_sink etb_sink_ops = {
.enable = etb_enable,
.disable = etb_disable,
@@ -481,6 +496,7 @@ static const struct coresight_ops_sink etb_sink_ops = {
.set_buffer = etb_set_buffer,
.reset_buffer = etb_reset_buffer,
.update_buffer = etb_update_buffer,
+ .panic_cb = etb_panic_cb,
};

static const struct coresight_ops etb_cs_ops = {
--
2.7.4
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