linux-kernel - Re: [PATCH v6 2/5] remoteproc: Add device-managed variants of rproc_alloc/rproc

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Date:   Sun, 19 Apr 2020 23:46:52 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>, od@...c.me,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/5] remoteproc: Add device-managed variants of
 rproc_alloc/rproc_add

On Fri 17 Apr 10:00 PDT 2020, Paul Cercueil wrote:

> Add API functions devm_rproc_alloc() and devm_rproc_add(), which behave
> like rproc_alloc() and rproc_add() respectively, but register their
> respective cleanup function to be called on driver detach.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
> 
> Notes:
>     v3: New patch
>     v4: No change
>     v5: - Fix return value documentation
>     	- Fix typo in documentation
>     v6: No change
> 
>  drivers/remoteproc/remoteproc_core.c | 67 ++++++++++++++++++++++++++++
>  include/linux/remoteproc.h           |  5 +++
>  2 files changed, 72 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index e12a54e67588..a7f96bc98406 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1949,6 +1949,33 @@ int rproc_add(struct rproc *rproc)
>  }
>  EXPORT_SYMBOL(rproc_add);
>  
> +static void devm_rproc_remove(void *rproc)
> +{
> +	rproc_del(rproc);
> +}
> +
> +/**
> + * devm_rproc_add() - resource managed rproc_add()
> + * @dev: the underlying device
> + * @rproc: the remote processor handle to register
> + *
> + * This function performs like rproc_add() but the registered rproc device will
> + * automatically be removed on driver detach.
> + *
> + * Returns: 0 on success, negative errno on failure
> + */
> +int devm_rproc_add(struct device *dev, struct rproc *rproc)
> +{
> +	int err;
> +
> +	err = rproc_add(rproc);
> +	if (err)
> +		return err;
> +
> +	return devm_add_action_or_reset(dev, devm_rproc_remove, rproc);
> +}
> +EXPORT_SYMBOL(devm_rproc_add);
> +
>  /**
>   * rproc_type_release() - release a remote processor instance
>   * @dev: the rproc's device
> @@ -2171,6 +2198,46 @@ int rproc_del(struct rproc *rproc)
>  }
>  EXPORT_SYMBOL(rproc_del);
>  
> +static void devm_rproc_free(struct device *dev, void *res)
> +{
> +	rproc_free(*(struct rproc **)res);
> +}
> +
> +/**
> + * devm_rproc_alloc() - resource managed rproc_alloc()
> + * @dev: the underlying device
> + * @name: name of this remote processor
> + * @ops: platform-specific handlers (mainly start/stop)
> + * @firmware: name of firmware file to load, can be NULL
> + * @len: length of private data needed by the rproc driver (in bytes)
> + *
> + * This function performs like rproc_alloc() but the acquired rproc device will
> + * automatically be released on driver detach.
> + *
> + * Returns: new rproc instance, or NULL on failure
> + */
> +struct rproc *devm_rproc_alloc(struct device *dev, const char *name,
> +			       const struct rproc_ops *ops,
> +			       const char *firmware, int len)
> +{
> +	struct rproc **ptr, *rproc;
> +
> +	ptr = devres_alloc(devm_rproc_free, sizeof(*ptr), GFP_KERNEL);
> +	if (!ptr)
> +		return ERR_PTR(-ENOMEM);
> +
> +	rproc = rproc_alloc(dev, name, ops, firmware, len);
> +	if (rproc) {
> +		*ptr = rproc;
> +		devres_add(dev, ptr);
> +	} else {
> +		devres_free(ptr);
> +	}
> +
> +	return rproc;
> +}
> +EXPORT_SYMBOL(devm_rproc_alloc);
> +
>  /**
>   * rproc_add_subdev() - add a subdevice to a remoteproc
>   * @rproc: rproc handle to add the subdevice to
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 9c07d7958c53..8c9c0dda03c3 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -599,6 +599,11 @@ int rproc_add(struct rproc *rproc);
>  int rproc_del(struct rproc *rproc);
>  void rproc_free(struct rproc *rproc);
>  
> +struct rproc *devm_rproc_alloc(struct device *dev, const char *name,
> +			       const struct rproc_ops *ops,
> +			       const char *firmware, int len);
> +int devm_rproc_add(struct device *dev, struct rproc *rproc);
> +
>  void rproc_add_carveout(struct rproc *rproc, struct rproc_mem_entry *mem);
>  
>  struct rproc_mem_entry *
> -- 
> 2.25.1
>