From mboxrd@z Thu Jan 1 00:00:00 1970 From: leo.yan@linaro.org (Leo Yan) Date: Sat, 3 Jun 2017 22:42:56 +0800 Subject: [PATCH v1 4/4] coresight: etb10: hook panic callback In-Reply-To: <1496500976-18362-1-git-send-email-leo.yan@linaro.org> References: <1496500976-18362-1-git-send-email-leo.yan@linaro.org> Message-ID: <1496500976-18362-5-git-send-email-leo.yan@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patch is to hook panic callback for etb10 driver; so after panic can dump trace data from it. Signed-off-by: Leo Yan --- 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 at 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