linux-kernel - Re: [PATCH 1/2] soc: qcom: aoss: Expose send for generic usecase

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Date:   Thu, 12 Nov 2020 00:03:20 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Chris Lew <clew@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, agross@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] soc: qcom: aoss: Expose send for generic usecase

Hey Chris,
Thanks for the patch.

On 2020-11-03 08:49, Chris Lew wrote:
> Not all upcoming usecases will have an interface to allow the aoss
> driver to hook onto. Expose the send api and create a get function to
> enable drivers to send their own messages to aoss.
> 
> Signed-off-by: Chris Lew <clew@...eaurora.org>
> ---
>  drivers/soc/qcom/qcom_aoss.c       | 28 +++++++++++++++++++++++++++-
>  include/linux/soc/qcom/qcom_aoss.h | 33 
> +++++++++++++++++++++++++++++++++
>  2 files changed, 60 insertions(+), 1 deletion(-)
>  create mode 100644 include/linux/soc/qcom/qcom_aoss.h
> 
> diff --git a/drivers/soc/qcom/qcom_aoss.c 
> b/drivers/soc/qcom/qcom_aoss.c
> index ed2c687c16b3..8f052db1880a 100644
> --- a/drivers/soc/qcom/qcom_aoss.c
> +++ b/drivers/soc/qcom/qcom_aoss.c
> @@ -8,10 +8,12 @@
>  #include <linux/io.h>
>  #include <linux/mailbox_client.h>
>  #include <linux/module.h>
> +#include <linux/of_platform.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_domain.h>
>  #include <linux/thermal.h>
>  #include <linux/slab.h>
> +#include <linux/soc/qcom/qcom_aoss.h>
> 
>  #define QMP_DESC_MAGIC			0x0
>  #define QMP_DESC_VERSION		0x4
> @@ -222,12 +224,15 @@ static bool qmp_message_empty(struct qmp *qmp)
>   *
>   * Return: 0 on success, negative errno on failure
>   */
> -static int qmp_send(struct qmp *qmp, const void *data, size_t len)
> +int qmp_send(struct qmp *qmp, const void *data, size_t len)
>  {
>  	long time_left;
>  	size_t tlen;
>  	int ret;
> 
> +	if (!qmp || !data)
> +		return -EINVAL;
> +
>  	if (WARN_ON(len + sizeof(u32) > qmp->size))
>  		return -EINVAL;
> 
> @@ -261,6 +266,7 @@ static int qmp_send(struct qmp *qmp, const void
> *data, size_t len)
> 
>  	return ret;
>  }
> +EXPORT_SYMBOL_GPL(qmp_send);
> 
>  static int qmp_qdss_clk_prepare(struct clk_hw *hw)
>  {
> @@ -515,6 +521,26 @@ static void qmp_cooling_devices_remove(struct qmp 
> *qmp)
>  		thermal_cooling_device_unregister(qmp->cooling_devs[i].cdev);
>  }
> 
> +/**
> + * qmp_get() - get a qmp handle from device tree node
> + * @np: of node of qmp device
> + *
> + * Return: handle to qmp device on success, ERR_PTR() on failure
> + */
> +struct qmp_device *qmp_get(struct device_node *np)
> +{
> +	struct platform_device *pdev;
> +	struct qmp *qmp;

Can we use this patch series to determine
the binding the client are expected to use
to point to the qmp phandle and have it
parsed here? This would mean that qmp_get
would take in device as input instead.
Bjorn suggested that clients use "qcom,qmp"
during an offline discussion. Let me know
what you think.

> +
> +	pdev = of_find_device_by_node(np);
> +	if (!pdev)
> +		return ERR_PTR(-EINVAL);
> +
> +	qmp = platform_get_drvdata(pdev);
> +	return qmp ? qmp : ERR_PTR(-EPROBE_DEFER);
> +}
> +EXPORT_SYMBOL_GPL(qmp_get);
> +
>  static int qmp_probe(struct platform_device *pdev)
>  {
>  	struct resource *res;
> diff --git a/include/linux/soc/qcom/qcom_aoss.h
> b/include/linux/soc/qcom/qcom_aoss.h
> new file mode 100644
> index 000000000000..05fc0ed3a10d
> --- /dev/null
> +++ b/include/linux/soc/qcom/qcom_aoss.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
> + */
> +
> +#ifndef __QCOM_AOSS_H__
> +#define __QCOM_AOSS_H__
> +
> +#include <linux/err.h>
> +#include <linux/of.h>
> +
> +struct qmp;
> +
> +#if IS_ENABLED(CONFIG_QCOM_AOSS_QMP)
> +
> +int qmp_send(struct qmp *qmp, const void *data, size_t len);
> +struct qmp_device *qmp_get(struct device_node *np);
> +
> +#else
> +
> +int qmp_send(struct qmp *qmp, const void *data, size_t len)
> +{
> +	return -ENODEV;
> +}
> +
> +struct qmp *qmp_get(struct device_node *np)
> +{
> +	return ERR_PTR(-ENODEV);
> +}
> +
> +#endif
> +
> +#endif

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