linux-kernel - Re: [PATCH v6 05/16] remoteproc: Add new get_loaded_rsc_table() to rproc

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Message-ID: <d21bebd0-6cf0-bc9d-c945-5e6aa2e5271d@foss.st.com>
Date:   Fri, 26 Feb 2021 17:14:36 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>, <ohad@...ery.com>,
        <bjorn.andersson@...aro.org>, <arnaud.pouliquen@...com>
CC:     <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 05/16] remoteproc: Add new get_loaded_rsc_table() to
 rproc_ops

Hi Mathieu,

On 2/24/21 12:35 AM, Mathieu Poirier wrote:
> Add a new get_loaded_rsc_table() operation in order to support
> scenarios where the remoteproc core has booted a remote processor
> and detaches from it.  When re-attaching to the remote processor,
> the core needs to know where the resource table has been placed
> in memory.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
> New for V6:
> - Don't return an error if a resource table doesn't exist.
> ---
> 
>  drivers/remoteproc/remoteproc_core.c     | 32 ++++++++++++++++++++++++
>  drivers/remoteproc/remoteproc_internal.h | 10 ++++++++
>  include/linux/remoteproc.h               |  6 ++++-
>  3 files changed, 47 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 8c7e9f1d50d7..0012b7bdce24 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1537,6 +1537,32 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>  	return ret;
>  }
>  
> +static int rproc_set_loaded_rsc_table(struct rproc *rproc)
> +{
> +	struct resource_table *table_ptr;
> +	struct device *dev = &rproc->dev;
> +	size_t table_sz;
> +	int ret;
> +
> +	table_ptr = rproc_get_loaded_rsc_table(rproc, &table_sz);
> +	if (!table_ptr) {
> +		/* Not having a resource table is acceptable */
> +		return 0;

Would it be an over protection to set rproc->table_ptr to NULL here?

else

Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@...com>

Thanks,
Arnaud

> +	}
> +
> +	if (IS_ERR(table_ptr)) {
> +		ret = PTR_ERR(table_ptr);
> +		dev_err(dev, "can't load resource table: %d\n", ret);
> +		return ret;
> +	}
> +
> +	rproc->cached_table = NULL;
> +	rproc->table_ptr = table_ptr;
> +	rproc->table_sz = table_sz;
> +
> +	return 0;
> +}
> +
>  /*
>   * Attach to remote processor - similar to rproc_fw_boot() but without
>   * the steps that deal with the firmware image.
> @@ -1556,6 +1582,12 @@ static int rproc_attach(struct rproc *rproc)
>  		return ret;
>  	}
>  
> +	ret = rproc_set_loaded_rsc_table(rproc);
> +	if (ret) {
> +		dev_err(dev, "can't load resource table: %d\n", ret);
> +		goto disable_iommu;
> +	}
> +
>  	/* reset max_notifyid */
>  	rproc->max_notifyid = -1;
>  
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index c34002888d2c..4f73aac7e60d 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -177,6 +177,16 @@ struct resource_table *rproc_find_loaded_rsc_table(struct rproc *rproc,
>  	return NULL;
>  }
>  
> +static inline
> +struct resource_table *rproc_get_loaded_rsc_table(struct rproc *rproc,
> +						  size_t *size)
> +{
> +	if (rproc->ops->get_loaded_rsc_table)
> +		return rproc->ops->get_loaded_rsc_table(rproc, size);
> +
> +	return NULL;
> +}
> +
>  static inline
>  bool rproc_u64_fit_in_size_t(u64 val)
>  {
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 6b0a0ed30a03..51538a7d120d 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -368,7 +368,9 @@ enum rsc_handling_status {
>   * RSC_HANDLED if resource was handled, RSC_IGNORED if not handled and a
>   * negative value on error
>   * @load_rsc_table:	load resource table from firmware image
> - * @find_loaded_rsc_table: find the loaded resouce table
> + * @find_loaded_rsc_table: find the loaded resource table from firmware image
> + * @get_loaded_rsc_table: get resource table installed in memory
> + *			  by external entity
>   * @load:		load firmware to memory, where the remote processor
>   *			expects to find it
>   * @sanity_check:	sanity check the fw image
> @@ -390,6 +392,8 @@ struct rproc_ops {
>  			  int offset, int avail);
>  	struct resource_table *(*find_loaded_rsc_table)(
>  				struct rproc *rproc, const struct firmware *fw);
> +	struct resource_table *(*get_loaded_rsc_table)(
> +				struct rproc *rproc, size_t *size);
>  	int (*load)(struct rproc *rproc, const struct firmware *fw);
>  	int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
>  	u64 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
>