From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Ohad Ben-Cohen <ohad@wizery.com>,
linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-remoteproc@vger.kernel.org,
Sibi Sankar <sibis@codeaurora.org>,
Rishabh Bhatnagar <rishabhb@codeaurora.org>
Subject: Re: [PATCH v2 6/8] remoteproc: Introduce "panic" callback in ops
Date: Fri, 10 Jan 2020 14:23:07 -0700 [thread overview]
Message-ID: <20200110212307.GC11555@xps15> (raw)
In-Reply-To: <20191227053215.423811-7-bjorn.andersson@linaro.org>
On Thu, Dec 26, 2019 at 09:32:13PM -0800, Bjorn Andersson wrote:
> Introduce a "panic" function in the remoteproc ops table, to allow
> remoteproc instances to perform operations needed in order to aid in
> post mortem system debugging, such as flushing caches etc, when the
> kernel panics.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Changes since v1:
> - None
>
> drivers/remoteproc/remoteproc_core.c | 17 +++++++++++++++++
> include/linux/remoteproc.h | 4 ++++
> 2 files changed, 21 insertions(+)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 307df98347ba..779f19d6d8e7 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1832,6 +1832,17 @@ void rproc_shutdown(struct rproc *rproc)
> }
> EXPORT_SYMBOL(rproc_shutdown);
>
> +static int rproc_panic_handler(struct notifier_block *nb, unsigned long event,
> + void *ptr)
> +{
> + struct rproc *rproc = container_of(nb, struct rproc, panic_nb);
> +
> + if (rproc->state == RPROC_RUNNING)
> + rproc->ops->panic(rproc);
> +
> + return NOTIFY_DONE;
> +}
> +
> /**
> * rproc_get_by_phandle() - find a remote processor by phandle
> * @phandle: phandle to the rproc
> @@ -2057,6 +2068,12 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
> rproc->ops->get_boot_addr = rproc_elf_get_boot_addr;
> }
>
> + /* Register panic notifier for remoteprocs with "panic" callback */
> + if (rproc->ops->panic) {
> + rproc->panic_nb.notifier_call = rproc_panic_handler;
> + atomic_notifier_chain_register(&panic_notifier_list, &rproc->panic_nb);
Line over 80 characters.
> + }
> +
> mutex_init(&rproc->lock);
>
> idr_init(&rproc->notifyids);
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 16ad66683ad0..7836c528d309 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -369,6 +369,7 @@ enum rsc_handling_status {
> * expects to find it
> * @sanity_check: sanity check the fw image
> * @get_boot_addr: get boot address to entry point specified in firmware
> + * @panic: optional callback to react to system panic
> */
> struct rproc_ops {
> int (*start)(struct rproc *rproc);
> @@ -383,6 +384,7 @@ struct rproc_ops {
> int (*load)(struct rproc *rproc, const struct firmware *fw);
> int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
> u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
> + void (*panic)(struct rproc *rproc);
> };
>
> /**
> @@ -481,6 +483,7 @@ struct rproc_dump_segment {
> * @auto_boot: flag to indicate if remote processor should be auto-started
> * @dump_segments: list of segments in the firmware
> * @nb_vdev: number of vdev currently handled by rproc
> + * @panic_nb: notifier_block for remoteproc's panic handler
> */
> struct rproc {
> struct list_head node;
> @@ -514,6 +517,7 @@ struct rproc {
> bool auto_boot;
> struct list_head dump_segments;
> int nb_vdev;
> + struct notifier_block panic_nb;
> };
>
> /**
> --
> 2.24.0
>
next prev parent reply other threads:[~2020-01-10 21:23 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-27 5:32 [PATCH v2 0/8] remoteproc: qcom: post mortem debug support Bjorn Andersson
2019-12-27 5:32 ` [PATCH v2 1/8] dt-bindings: remoteproc: Add Qualcomm PIL info binding Bjorn Andersson
2020-01-04 21:38 ` Rob Herring
2020-01-04 22:17 ` Bjorn Andersson
2020-01-23 22:07 ` Rob Herring
2019-12-27 5:32 ` [PATCH v2 2/8] remoteproc: qcom: Introduce driver to store pil info in IMEM Bjorn Andersson
2020-01-10 21:18 ` Mathieu Poirier
2020-01-22 2:02 ` Bjorn Andersson
2020-01-22 19:04 ` Mathieu Poirier
2020-01-22 19:19 ` Bjorn Andersson
2020-01-22 22:56 ` rishabhb
2020-01-22 23:08 ` Bjorn Andersson
2020-01-22 23:58 ` rishabhb
2020-01-23 5:38 ` Bjorn Andersson
2019-12-27 5:32 ` [PATCH v2 3/8] remoteproc: qcom: Update IMEM PIL info on load Bjorn Andersson
2020-01-10 21:19 ` Mathieu Poirier
2019-12-27 5:32 ` [PATCH v2 4/8] arm64: dts: qcom: qcs404: Add IMEM and PIL info region Bjorn Andersson
2019-12-27 5:32 ` [PATCH v2 5/8] arm64: dts: qcom: sdm845: " Bjorn Andersson
2019-12-27 5:32 ` [PATCH v2 6/8] remoteproc: Introduce "panic" callback in ops Bjorn Andersson
2020-01-10 21:23 ` Mathieu Poirier [this message]
2020-01-30 10:07 ` Arnaud POULIQUEN
2019-12-27 5:32 ` [PATCH v2 7/8] remoteproc: qcom: q6v5: Add common panic handler Bjorn Andersson
2020-01-10 21:28 ` Mathieu Poirier
2020-01-22 19:39 ` Bjorn Andersson
2020-01-23 17:01 ` Mathieu Poirier
2020-01-23 17:15 ` Bjorn Andersson
2020-01-23 17:49 ` Arnaud POULIQUEN
2020-01-24 18:44 ` Mathieu Poirier
2020-01-27 9:46 ` Arnaud POULIQUEN
2020-01-29 20:15 ` Mathieu Poirier
2020-01-30 10:00 ` Arnaud POULIQUEN
2019-12-27 5:32 ` [PATCH v2 8/8] remoteproc: qcom: Introduce panic handler for PAS and ADSP Bjorn Andersson
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