linux-kernel - Re: [PATCH 1/7] remoteproc: add prepare and unprepare ops

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Message-ID: <042074fb-46b3-f6d9-8203-27a8bc540666@ti.com>
Date:   Wed, 8 Apr 2020 18:39:42 -0500
From:   Suman Anna <s-anna@...com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Lokesh Vutla <lokeshvutla@...com>,
        <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Loic Pallardy <loic.pallardy@...com>
Subject: Re: [PATCH 1/7] remoteproc: add prepare and unprepare ops

Hi Mathieu,

On 4/6/20 12:20 PM, Mathieu Poirier wrote:
> Good morning Suman,
> 
> I have started to work on this set - comments will come in over the next few
> days...
> 
> On Tue, Mar 24, 2020 at 03:18:13PM -0500, Suman Anna wrote:
>> From: Loic Pallardy <loic.pallardy@...com>
>>
>> On some SoC architecture, it is needed to enable HW like
>> clock, bus, regulator, memory region... before loading
>> co-processor firmware.
>>
>> This patch introduces prepare and unprepare ops to execute
>> platform specific function before firmware loading and after
>> stop execution.
>>
>> Signed-off-by: Loic Pallardy <loic.pallardy@...com>
>> Signed-off-by: Suman Anna <s-anna@...com>
>> ---
>>  drivers/remoteproc/remoteproc_core.c | 20 +++++++++++++++++++-
>>  include/linux/remoteproc.h           |  4 ++++
>>  2 files changed, 23 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
>> index 26f6947267d2..aca6d022901a 100644
>> --- a/drivers/remoteproc/remoteproc_core.c
>> +++ b/drivers/remoteproc/remoteproc_core.c
>> @@ -1394,12 +1394,22 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>>  		return ret;
>>  	}
>>  
>> +	/* Prepare rproc for firmware loading if needed */
>> +	if (rproc->ops->prepare) {
>> +		ret = rproc->ops->prepare(rproc);
> 
> In my patchset on MCU synchronisation I have moved ops->{start/stop} to
> remoteproc_internal.h and called them rproc_start/stop_device() (after Loic's
> suggestion).  In order to be consistent and remove boiler plate code in the core
> we could do the same, i.e have rproc_prepare/unprepare_device() in
> remoteproc_internal.h .

Yes, I will update so for v2. I plan to separate out this patch and the
next patch for v2 to go alongside your cleanup and Alex's patch on the
idr_init move.

regards
Suman

> 
> With the above:
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> 
> Thanks,
> Mathieu
> 
>> +		if (ret) {
>> +			dev_err(dev, "can't prepare rproc %s: %d\n",
>> +				rproc->name, ret);
>> +			goto disable_iommu;
>> +		}
>> +	}
>> +
>>  	rproc->bootaddr = rproc_get_boot_addr(rproc, fw);
>>  
>>  	/* Load resource table, core dump segment list etc from the firmware */
>>  	ret = rproc_parse_fw(rproc, fw);
>>  	if (ret)
>> -		goto disable_iommu;
>> +		goto unprepare_rproc;
>>  
>>  	/* reset max_notifyid */
>>  	rproc->max_notifyid = -1;
>> @@ -1433,6 +1443,10 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>>  	kfree(rproc->cached_table);
>>  	rproc->cached_table = NULL;
>>  	rproc->table_ptr = NULL;
>> +unprepare_rproc:
>> +	/* release HW resources if needed */
>> +	if (rproc->ops->unprepare)
>> +		rproc->ops->unprepare(rproc);
>>  disable_iommu:
>>  	rproc_disable_iommu(rproc);
>>  	return ret;
>> @@ -1838,6 +1852,10 @@ void rproc_shutdown(struct rproc *rproc)
>>  	/* clean up all acquired resources */
>>  	rproc_resource_cleanup(rproc);
>>  
>> +	/* release HW resources if needed */
>> +	if (rproc->ops->unprepare)
>> +		rproc->ops->unprepare(rproc);
>> +
>>  	rproc_disable_iommu(rproc);
>>  
>>  	/* Free the copy of the resource table */
>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>> index 07bd73a6d72a..ddce7a7775d1 100644
>> --- a/include/linux/remoteproc.h
>> +++ b/include/linux/remoteproc.h
>> @@ -355,6 +355,8 @@ enum rsc_handling_status {
>>  
>>  /**
>>   * struct rproc_ops - platform-specific device handlers
>> + * @prepare:	prepare device for code loading
>> + * @unprepare:	unprepare device after stop
>>   * @start:	power on the device and boot it
>>   * @stop:	power off the device
>>   * @kick:	kick a virtqueue (virtqueue id given as a parameter)
>> @@ -371,6 +373,8 @@ enum rsc_handling_status {
>>   * @get_boot_addr:	get boot address to entry point specified in firmware
>>   */
>>  struct rproc_ops {
>> +	int (*prepare)(struct rproc *rproc);
>> +	int (*unprepare)(struct rproc *rproc);
>>  	int (*start)(struct rproc *rproc);
>>  	int (*stop)(struct rproc *rproc);
>>  	void (*kick)(struct rproc *rproc, int vqid);
>> -- 
>> 2.23.0
>>
>