Re: [PATCH v15 3/8] remoteproc: Introduce load_fw and release_fw optional operation

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Hello Mathieu,

Thanks for the review!
I just need to clarify a point below before preparing the next revision.

On 12/3/24 18:22, Mathieu Poirier wrote:
> On Thu, Nov 28, 2024 at 09:42:10AM +0100, Arnaud Pouliquen wrote:
>> This patch updates the rproc_ops structures to include two new optional
>> operations.
>>
>> - The load_fw() op is responsible for loading the remote processor
>> non-ELF firmware image before starting the boot sequence. This ops will
>> be used, for instance, to call OP-TEE to  authenticate an load the firmware
>> image before accessing to its resources (a.e the resource table)
>>
>> - The release_fw op is responsible for releasing the remote processor
>> firmware image. For instance to clean memories.
>> The ops is called in the following cases:
>>  - An error occurs between the loading of the firmware image and the
>>    start of the remote processor.
>>  - after stopping the remote processor.
>>
>> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxxxxxxx>
>> ---
>> Update vs version V13:
>> - Rework the commit to introduce load_fw() op.
>> - remove rproc_release_fw() call from  rproc_start() as called in
>>   rproc_boot() and rproc_boot_recovery() in case of error.
>> - create rproc_load_fw() and rproc_release_fw() internal functions.
>> ---
>>  drivers/remoteproc/remoteproc_core.c     | 16 +++++++++++++++-
>>  drivers/remoteproc/remoteproc_internal.h | 14 ++++++++++++++
>>  include/linux/remoteproc.h               |  6 ++++++
>>  3 files changed, 35 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
>> index ace11ea17097..8df4b2c59bb6 100644
>> --- a/drivers/remoteproc/remoteproc_core.c
>> +++ b/drivers/remoteproc/remoteproc_core.c
>> @@ -1488,6 +1488,7 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>>  	kfree(rproc->cached_table);
>>  	rproc->cached_table = NULL;
>>  	rproc->table_ptr = NULL;
>> +	rproc_release_fw(rproc);
> 
> This is not needed since rproc_release_fw() is called in rproc_boot().
> 
>>  unprepare_rproc:
>>  	/* release HW resources if needed */
>>  	rproc_unprepare_device(rproc);
>> @@ -1855,8 +1856,14 @@ static int rproc_boot_recovery(struct rproc *rproc)
>>  		return ret;
>>  	}
>>  
>> +	ret = rproc_load_fw(rproc, firmware_p);
>> +	if (ret)
>> +		return ret;
>> +
>>  	/* boot the remote processor up again */
>>  	ret = rproc_start(rproc, firmware_p);
>> +	if (ret)
>> +		rproc_release_fw(rproc);
>>  
>>  	release_firmware(firmware_p);
>>  
>> @@ -1997,7 +2004,13 @@ int rproc_boot(struct rproc *rproc)
>>  			goto downref_rproc;
>>  		}
>>  
>> +		ret = rproc_load_fw(rproc, firmware_p);
>> +		if (ret)
>> +			goto downref_rproc;
> 
> In case of error the firmware is not released.

I considered that if the load fails, the firmware is not loaded
and therefore does not need to be released.
In other words, in case of a load error in OP-TEE, OP-TEE should
perform the cleanup to return to its initial state before the load.

Do you see a use case where we should force the release in Linux?
Otherwise, I would propose to implement this behavior later if needed.

Thanks,
Arnaud

> 
>> +
>>  		ret = rproc_fw_boot(rproc, firmware_p);
>> +		if (ret)
>> +			rproc_release_fw(rproc);
>>  
>>  		release_firmware(firmware_p);
>>  	}
>> @@ -2071,6 +2084,7 @@ int rproc_shutdown(struct rproc *rproc)
>>  	kfree(rproc->cached_table);
>>  	rproc->cached_table = NULL;
>>  	rproc->table_ptr = NULL;
>> +	rproc_release_fw(rproc);
> 
> Please move this after rproc_disable_iommu().
> 
> 
>>  out:
>>  	mutex_unlock(&rproc->lock);
>>  	return ret;
>> @@ -2471,7 +2485,7 @@ static int rproc_alloc_ops(struct rproc *rproc, const struct rproc_ops *ops)
>>  	if (!rproc->ops->coredump)
>>  		rproc->ops->coredump = rproc_coredump;
>>  
>> -	if (rproc->ops->load)
>> +	if (rproc->ops->load || rproc->ops->load_fw)
>>  		return 0;
>>  
>>  	/* Default to ELF loader if no load function is specified */
>> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
>> index 0cd09e67ac14..2104ca449178 100644
>> --- a/drivers/remoteproc/remoteproc_internal.h
>> +++ b/drivers/remoteproc/remoteproc_internal.h
>> @@ -221,4 +221,18 @@ bool rproc_u64_fit_in_size_t(u64 val)
>>  	return (val <= (size_t) -1);
>>  }
>>  
>> +static inline void rproc_release_fw(struct rproc *rproc)
>> +{
>> +	if (rproc->ops->release_fw)
>> +		rproc->ops->release_fw(rproc);
>> +}
>> +
>> +static inline int rproc_load_fw(struct rproc *rproc, const struct firmware *fw)
>> +{
>> +	if (rproc->ops->load_fw)
>> +		return rproc->ops->load_fw(rproc, fw);
>> +
>> +	return 0;
>> +}
>> +
>>  #endif /* REMOTEPROC_INTERNAL_H */
>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>> index 2e0ddcb2d792..ba6fd560f7ba 100644
>> --- a/include/linux/remoteproc.h
>> +++ b/include/linux/remoteproc.h
>> @@ -381,6 +381,10 @@ enum rsc_handling_status {
>>   * @panic:	optional callback to react to system panic, core will delay
>>   *		panic at least the returned number of milliseconds
>>   * @coredump:	  collect firmware dump after the subsystem is shutdown
>> + * @load_fw:	optional function to load non-ELF firmware image to memory, where the remote
> 
> Round this down to 80 characters please.  Here having a longer line doesn't
> improve readability.
> 
>> + *		processor expects to find it.
>> + * @release_fw:	optional function to release the firmware image from memories.
>> + *		This function is called after stopping the remote processor or in case of error
> 
> Same.
> 
> More comments tomorrow or later during the week.
> 
> Thanks,
> Mathieu
> 
>>   */
>>  struct rproc_ops {
>>  	int (*prepare)(struct rproc *rproc);
>> @@ -403,6 +407,8 @@ struct rproc_ops {
>>  	u64 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
>>  	unsigned long (*panic)(struct rproc *rproc);
>>  	void (*coredump)(struct rproc *rproc);
>> +	int (*load_fw)(struct rproc *rproc, const struct firmware *fw);
>> +	void (*release_fw)(struct rproc *rproc);
>>  };
>>  
>>  /**
>> -- 
>> 2.25.1
>>




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