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Subject: Re: [PATCH 5/5] remoteproc: Introduce prepare and unprepare for
 subdevices
To:     Fabien DESSENNE <fabien.dessenne@st.com>,
        Arnaud POULIQUEN <arnaud.pouliquen@st.com>,
        "ohad@wizery.com" <ohad@wizery.com>,
        "bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>
Cc:     "linux-remoteproc@vger.kernel.org" <linux-remoteproc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20180515205345.8090-1-elder@linaro.org>
 <20180515205345.8090-6-elder@linaro.org>
 <90ecf369-517c-1741-0af2-c1988986d2a9@st.com>
 <872c26d7-52ff-d82f-373e-236fd713ec33@st.com>
From:   Alex Elder <elder@linaro.org>
Message-ID: <b4497e23-fbc2-e739-07ed-af78273cce09@linaro.org>
Date:   Tue, 29 May 2018 10:31:49 -0500
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On 05/29/2018 10:30 AM, Fabien DESSENNE wrote:
> Hi,
> 
> Adding my 'Tested-by'.

Normally you would say:

    Tested-by: Fabien DESSENNE <fabien.dessenne@st.com>

The reason it might be important is you might wish to indicate the
name and/or e-mail as something different from what you're now
sending from.

Is what I wrote above the way you would like it to appear?

I will add that line to every one of my patches when I update them.

Thanks.

					-Alex
> 
> BR,
> 
> Fabien
> 
> 
> On 29/05/18 17:26, Arnaud Pouliquen wrote:
>> Hi Fabien,
>> Please , could you add your "Tested-by" as you test it on ST platform?
>>
>> Thanks
>> Arnaud
>>
>> On 05/15/2018 10:53 PM, Alex Elder wrote:
>>> From: Bjorn Andersson <bjorn.andersson@linaro.org>
>>>
>>> On rare occasions a subdevice might need to prepare some hardware
>>> resources before a remote processor is booted, and clean up some
>>> state after it has been shut down.
>>>
>>> One such example is the IP Accelerator found in various Qualcomm
>>> platforms, which is accessed directly from both the modem remoteproc
>>> and the application subsystem and requires an intricate lockstep
>>> process when bringing the modem up and down.
>>>
>>> [elder@linaro.org: minor description and comment edits]
>>>
>>> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
>>> Acked-by: Alex Elder <elder@linaro.org>
> 
> Tested-by: Fabien Dessenne <fabien.dessenne@st.com>
> 
>>> ---
>>>   drivers/remoteproc/remoteproc_core.c | 56 ++++++++++++++++++++++++++--
>>>   include/linux/remoteproc.h           |  4 ++
>>>   2 files changed, 57 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
>>> index 2ede7ae6f5bc..283b258f5e0f 100644
>>> --- a/drivers/remoteproc/remoteproc_core.c
>>> +++ b/drivers/remoteproc/remoteproc_core.c
>>> @@ -776,6 +776,30 @@ static int rproc_handle_resources(struct rproc *rproc,
>>>   	return ret;
>>>   }
>>>   
>>> +static int rproc_prepare_subdevices(struct rproc *rproc)
>>> +{
>>> +	struct rproc_subdev *subdev;
>>> +	int ret;
>>> +
>>> +	list_for_each_entry(subdev, &rproc->subdevs, node) {
>>> +		if (subdev->prepare) {
>>> +			ret = subdev->prepare(subdev);
>>> +			if (ret)
>>> +				goto unroll_preparation;
>>> +		}
>>> +	}
>>> +
>>> +	return 0;
>>> +
>>> +unroll_preparation:
>>> +	list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) {
>>> +		if (subdev->unprepare)
>>> +			subdev->unprepare(subdev);
>>> +	}
>>> +
>>> +	return ret;
>>> +}
>>> +
>>>   static int rproc_start_subdevices(struct rproc *rproc)
>>>   {
>>>   	struct rproc_subdev *subdev;
>>> @@ -810,6 +834,16 @@ static void rproc_stop_subdevices(struct rproc *rproc, bool crashed)
>>>   	}
>>>   }
>>>   
>>> +static void rproc_unprepare_subdevices(struct rproc *rproc)
>>> +{
>>> +	struct rproc_subdev *subdev;
>>> +
>>> +	list_for_each_entry_reverse(subdev, &rproc->subdevs, node) {
>>> +		if (subdev->unprepare)
>>> +			subdev->unprepare(subdev);
>>> +	}
>>> +}
>>> +
>>>   /**
>>>    * rproc_coredump_cleanup() - clean up dump_segments list
>>>    * @rproc: the remote processor handle
>>> @@ -902,11 +936,18 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>>>   		rproc->table_ptr = loaded_table;
>>>   	}
>>>   
>>> +	ret = rproc_prepare_subdevices(rproc);
>>> +	if (ret) {
>>> +		dev_err(dev, "failed to prepare subdevices for %s: %d\n",
>>> +			rproc->name, ret);
>>> +		return ret;
>>> +	}
>>> +
>>>   	/* power up the remote processor */
>>>   	ret = rproc->ops->start(rproc);
>>>   	if (ret) {
>>>   		dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
>>> -		return ret;
>>> +		goto unprepare_subdevices;
>>>   	}
>>>   
>>>   	/* Start any subdevices for the remote processor */
>>> @@ -914,8 +955,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>>>   	if (ret) {
>>>   		dev_err(dev, "failed to probe subdevices for %s: %d\n",
>>>   			rproc->name, ret);
>>> -		rproc->ops->stop(rproc);
>>> -		return ret;
>>> +		goto stop_rproc;
>>>   	}
>>>   
>>>   	rproc->state = RPROC_RUNNING;
>>> @@ -923,6 +963,14 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
>>>   	dev_info(dev, "remote processor %s is now up\n", rproc->name);
>>>   
>>>   	return 0;
>>> +
>>> +stop_rproc:
>>> +	rproc->ops->stop(rproc);
>>> +
>>> +unprepare_subdevices:
>>> +	rproc_unprepare_subdevices(rproc);
>>> +
>>> +	return ret;
>>>   }
>>>   
>>>   /*
>>> @@ -1035,6 +1083,8 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
>>>   		return ret;
>>>   	}
>>>   
>>> +	rproc_unprepare_subdevices(rproc);
>>> +
>>>   	rproc->state = RPROC_OFFLINE;
>>>   
>>>   	dev_info(dev, "stopped remote processor %s\n", rproc->name);
>>> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
>>> index 8f1426330cca..e3c5d856b6da 100644
>>> --- a/include/linux/remoteproc.h
>>> +++ b/include/linux/remoteproc.h
>>> @@ -477,15 +477,19 @@ struct rproc {
>>>   /**
>>>    * struct rproc_subdev - subdevice tied to a remoteproc
>>>    * @node: list node related to the rproc subdevs list
>>> + * @prepare: prepare function, called before the rproc is started
>>>    * @start: start function, called after the rproc has been started
>>>    * @stop: stop function, called before the rproc is stopped; the @crashed
>>>    *	    parameter indicates if this originates from a recovery
>>> + * @unprepare: unprepare function, called after the rproc has been stopped
>>>    */
>>>   struct rproc_subdev {
>>>   	struct list_head node;
>>>   
>>> +	int (*prepare)(struct rproc_subdev *subdev);
>>>   	int (*start)(struct rproc_subdev *subdev);
>>>   	void (*stop)(struct rproc_subdev *subdev, bool crashed);
>>> +	void (*unprepare)(struct rproc_subdev *subdev);
>>>   };
>>>   
>>>   /* we currently support only two vrings per rvdev */
>>>