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Date:   Fri, 1 May 2020 09:41:10 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Ohad Ben-Cohen <ohad@...ery.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        Chris Lew <clew@...eaurora.org>, Sibi <sibis@...eaurora.org>,
        Siddharth Gupta <sidgup@...eaurora.org>
Subject: Re: [PATCH 1/4] remoteproc: qcom: Pass ssr_name to glink subdevice

Good morning Bjorn,

On Wed, Apr 22, 2020 at 05:37:33PM -0700, Bjorn Andersson wrote:
> Pass ssr_name to glink subdevice in preparation for tying glink_ssr to
> the glink subdevice, rather than having its own "ssr subdevice".
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/remoteproc/qcom_common.c    | 9 ++++++++-
>  drivers/remoteproc/qcom_common.h    | 5 ++++-
>  drivers/remoteproc/qcom_q6v5_adsp.c | 2 +-
>  drivers/remoteproc/qcom_q6v5_mss.c  | 2 +-
>  drivers/remoteproc/qcom_q6v5_pas.c  | 2 +-
>  5 files changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
> index 60650bcc8c67..ff26f2b68752 100644
> --- a/drivers/remoteproc/qcom_common.c
> +++ b/drivers/remoteproc/qcom_common.c
> @@ -46,8 +46,10 @@ static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
>   * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
>   * @rproc:	rproc handle to parent the subdevice
>   * @glink:	reference to a GLINK subdev context
> + * @ssr_name:	identifier of the associated remoteproc for ssr notifications
>   */
> -void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
> +void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
> +			   const char *ssr_name)
>  {
>  	struct device *dev = &rproc->dev;
>  
> @@ -55,6 +57,10 @@ void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
>  	if (!glink->node)
>  		return;
>  
> +	glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
> +	if (!glink->ssr_name)
> +		return;
> +

In case or an error with the allocation of ->ssr_name an
of_node_put(glink->node) needs to be done.  That way qcom_add_glink_subdev()
cleans up after itself if things go wrong.  On the flip side the same
of_node_put() will be done when the driver is removed.  So I'm ambivalent on
this one.  With or without this change:

Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>  

>  	glink->dev = dev;
>  	glink->subdev.start = glink_subdev_start;
>  	glink->subdev.stop = glink_subdev_stop;
> @@ -74,6 +80,7 @@ void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glin
>  		return;
>  
>  	rproc_remove_subdev(rproc, &glink->subdev);
> +	kfree_const(glink->ssr_name);
>  	of_node_put(glink->node);
>  }
>  EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
> diff --git a/drivers/remoteproc/qcom_common.h b/drivers/remoteproc/qcom_common.h
> index 58de71e4781c..34e5188187dc 100644
> --- a/drivers/remoteproc/qcom_common.h
> +++ b/drivers/remoteproc/qcom_common.h
> @@ -11,6 +11,8 @@ struct qcom_sysmon;
>  struct qcom_rproc_glink {
>  	struct rproc_subdev subdev;
>  
> +	const char *ssr_name;
> +
>  	struct device *dev;
>  	struct device_node *node;
>  	struct qcom_glink *edge;
> @@ -30,7 +32,8 @@ struct qcom_rproc_ssr {
>  	const char *name;
>  };
>  
> -void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink);
> +void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
> +			   const char *ssr_name);
>  void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink);
>  
>  int qcom_register_dump_segments(struct rproc *rproc, const struct firmware *fw);
> diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c b/drivers/remoteproc/qcom_q6v5_adsp.c
> index c60dabc6939e..d2a2574dcf35 100644
> --- a/drivers/remoteproc/qcom_q6v5_adsp.c
> +++ b/drivers/remoteproc/qcom_q6v5_adsp.c
> @@ -461,7 +461,7 @@ static int adsp_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto disable_pm;
>  
> -	qcom_add_glink_subdev(rproc, &adsp->glink_subdev);
> +	qcom_add_glink_subdev(rproc, &adsp->glink_subdev, desc->ssr_name);
>  	qcom_add_ssr_subdev(rproc, &adsp->ssr_subdev, desc->ssr_name);
>  	adsp->sysmon = qcom_add_sysmon_subdev(rproc,
>  					      desc->sysmon_name,
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 7af1d0c987e0..b5dd36775b77 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -1762,7 +1762,7 @@ static int q6v5_probe(struct platform_device *pdev)
>  
>  	qproc->mpss_perm = BIT(QCOM_SCM_VMID_HLOS);
>  	qproc->mba_perm = BIT(QCOM_SCM_VMID_HLOS);
> -	qcom_add_glink_subdev(rproc, &qproc->glink_subdev);
> +	qcom_add_glink_subdev(rproc, &qproc->glink_subdev, "mpss");
>  	qcom_add_smd_subdev(rproc, &qproc->smd_subdev);
>  	qcom_add_ssr_subdev(rproc, &qproc->ssr_subdev, "mpss");
>  	qcom_add_ipa_notify_subdev(rproc, &qproc->ipa_notify_subdev);
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index 8ecc157f1ed1..fc6658b523b6 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -436,7 +436,7 @@ static int adsp_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto detach_proxy_pds;
>  
> -	qcom_add_glink_subdev(rproc, &adsp->glink_subdev);
> +	qcom_add_glink_subdev(rproc, &adsp->glink_subdev, desc->ssr_name);
>  	qcom_add_smd_subdev(rproc, &adsp->smd_subdev);
>  	qcom_add_ssr_subdev(rproc, &adsp->ssr_subdev, desc->ssr_name);
>  	adsp->sysmon = qcom_add_sysmon_subdev(rproc,
> -- 
> 2.24.0
> 

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