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remoteproc: qcom: q6v5: Add common panic handler

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Add a common panic handler that invokes a stop request and sleep enough
to let the remoteproc flush it's caches etc in order to aid post mortem
debugging. For now a hard coded 200ms is returned to the remoteproc
core, this value is taken from the downstream kernel.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200324052904.738594-4-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson 2020-03-23 22:29:03 -07:00
parent dc5192c449
commit e9142f5c28
2 changed files with 21 additions and 0 deletions
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20
drivers/remoteproc/qcom_q6v5.c
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@ -15,6 +15,8 @@
#include <linux/remoteproc.h>
#include "qcom_q6v5.h"
#define Q6V5_PANIC_DELAY_MS 200
/**
* qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start
* @q6v5: reference to qcom_q6v5 context to be reinitialized
@ -162,6 +164,24 @@ int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5)
}
EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
/**
* qcom_q6v5_panic() - panic handler to invoke a stop on the remote
* @q6v5: reference to qcom_q6v5 context
*
* Set the stop bit and sleep in order to allow the remote processor to flush
* its caches etc for post mortem debugging.
*
* Return: 200ms
*/
unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
{
qcom_smem_state_update_bits(q6v5->state,
BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
return Q6V5_PANIC_DELAY_MS;
}
EXPORT_SYMBOL_GPL(qcom_q6v5_panic);
/**
* qcom_q6v5_init() - initializer of the q6v5 common struct
* @q6v5: handle to be initialized

1
drivers/remoteproc/qcom_q6v5.h
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@ -42,5 +42,6 @@ int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5);
int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5);
int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5);
int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout);
unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5);
#endif