linux-kernel - Re: [PATCH v4 05/17] remoteproc: add helper function to allocate and init rproc_mem

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Date:   Tue, 23 Oct 2018 14:24:08 -0500
From:   Suman Anna <s-anna@...com>
To:     Loic Pallardy <loic.pallardy@...com>, <bjorn.andersson@...aro.org>,
        <ohad@...ery.com>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <arnaud.pouliquen@...com>, <benjamin.gaignard@...aro.org>
Subject: Re: [PATCH v4 05/17] remoteproc: add helper function to allocate and
 init rproc_mem_entry struct

On 7/27/18 8:14 AM, Loic Pallardy wrote:
> This patch introduces rproc_mem_entry_init helper function to
> simplify rproc_mem_entry structure allocation and filling by
> client.
> 
> Signed-off-by: Loic Pallardy <loic.pallardy@...com>

Reviewed-by: Suman Anna <s-anna@...com>

> ---
>  drivers/remoteproc/remoteproc_core.c | 65 +++++++++++++++++++++++++++---------
>  include/linux/remoteproc.h           |  6 ++++
>  2 files changed, 55 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index d7e3138..b76760e 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -639,7 +639,7 @@ static int rproc_handle_carveout(struct rproc *rproc,
>  				 struct fw_rsc_carveout *rsc,
>  				 int offset, int avail)
>  {
> -	struct rproc_mem_entry *carveout, *mapping;
> +	struct rproc_mem_entry *carveout, *mapping = NULL;
>  	struct device *dev = &rproc->dev;
>  	dma_addr_t dma;
>  	void *va;
> @@ -659,16 +659,11 @@ static int rproc_handle_carveout(struct rproc *rproc,
>  	dev_dbg(dev, "carveout rsc: name: %s, da 0x%x, pa 0x%x, len 0x%x, flags 0x%x\n",
>  		rsc->name, rsc->da, rsc->pa, rsc->len, rsc->flags);
>  
> -	carveout = kzalloc(sizeof(*carveout), GFP_KERNEL);
> -	if (!carveout)
> -		return -ENOMEM;
> -
>  	va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL);
>  	if (!va) {
>  		dev_err(dev->parent,
>  			"failed to allocate dma memory: len 0x%x\n", rsc->len);
> -		ret = -ENOMEM;
> -		goto free_carv;
> +		return -ENOMEM;
>  	}
>  
>  	dev_dbg(dev, "carveout va %pK, dma %pad, len 0x%x\n",
> @@ -747,27 +742,65 @@ static int rproc_handle_carveout(struct rproc *rproc,
>  	 */
>  	rsc->pa = (u32)rproc_va_to_pa(va);
>  
> -	carveout->va = va;
> -	carveout->len = rsc->len;
> -	carveout->dma = dma;
> -	carveout->da = rsc->da;
> -	carveout->release = rproc_release_carveout;
> -	strlcpy(carveout->name, rsc->name, sizeof(carveout->name));
> +	carveout = rproc_mem_entry_init(dev, va, dma, rsc->len, rsc->da,
> +					rproc_release_carveout, rsc->name);
> +	if (!carveout)
> +		goto free_carv;
>  
>  	list_add_tail(&carveout->node, &rproc->carveouts);
>  
>  	return 0;
>  
> +free_carv:
> +	kfree(carveout);
>  free_mapping:
>  	kfree(mapping);
>  dma_free:
>  	dma_free_coherent(dev->parent, rsc->len, va, dma);
> -free_carv:
> -	kfree(carveout);
>  	return ret;
>  }
>  
> -/*
> +/**
> + * rproc_mem_entry_init() - allocate and initialize rproc_mem_entry struct
> + * @dev: pointer on device struct
> + * @va: virtual address
> + * @dma: dma address
> + * @len: memory carveout length
> + * @da: device address
> + * @release: memory carveout function
> + * @name: carveout name
> + *
> + * This function allocates a rproc_mem_entry struct and fill it with parameters
> + * provided by client.
> + */
> +struct rproc_mem_entry *
> +rproc_mem_entry_init(struct device *dev,
> +		     void *va, dma_addr_t dma, int len, u32 da,
> +		     int (*release)(struct rproc *, struct rproc_mem_entry *),
> +		     const char *name, ...)
> +{
> +	struct rproc_mem_entry *mem;
> +	va_list args;
> +
> +	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
> +	if (!mem)
> +		return mem;
> +
> +	mem->va = va;
> +	mem->dma = dma;
> +	mem->da = da;
> +	mem->len = len;
> +	mem->release = release;
> +
> +	va_start(args, name);
> +	vsnprintf(mem->name, sizeof(mem->name), name, args);
> +	va_end(args);
> +
> +	return mem;
> +}
> +EXPORT_SYMBOL(rproc_mem_entry_init);
> +
> +/**
>   * A lookup table for resource handlers. The indices are defined in
>   * enum fw_resource_type.
>   */
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 0e21098..4bc961f 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -558,6 +558,12 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
>  int rproc_del(struct rproc *rproc);
>  void rproc_free(struct rproc *rproc);
>  
> +struct rproc_mem_entry *
> +rproc_mem_entry_init(struct device *dev,
> +		     void *va, dma_addr_t dma, int len, u32 da,
> +		     int (*release)(struct rproc *, struct rproc_mem_entry *),
> +		     const char *name, ...);
> +
>  int rproc_boot(struct rproc *rproc);
>  void rproc_shutdown(struct rproc *rproc);
>  void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
>