linux-kernel - Re: [PATCH v3 3/3] remoteproc: xilinx: add mailbox channels for rpmsg

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Message-ID: <cda08910-52f1-b0d2-3e06-6c5b930f898a@amd.com>
Date:   Wed, 22 Feb 2023 14:49:34 -0600
From:   Tanmay Shah <tanmays@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Tanmay Shah <tanmay.shah@....com>
Cc:     michal.simek@....com, andersson@...nel.org,
        jaswinder.singh@...aro.org, ben.levinsky@....com,
        shubhrajyoti.datta@....com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH v3 3/3] remoteproc: xilinx: add mailbox channels for rpmsg


On 2/22/23 11:06 AM, Mathieu Poirier wrote:
> On Mon, Feb 13, 2023 at 01:18:26PM -0800, Tanmay Shah wrote:
>> [ ... ]
>> +
>>   /*
>>    * zynqmp_r5_set_mode()
>>    *
>> @@ -617,7 +819,7 @@ static int zynqmp_r5_rproc_unprepare(struct rproc *rproc)
>>   	return 0;
>>   }
>>   
>> -static const struct rproc_ops zynqmp_r5_rproc_ops = {
>> +static struct rproc_ops zynqmp_r5_rproc_ops = {
>>   	.prepare	= zynqmp_r5_rproc_prepare,
>>   	.unprepare	= zynqmp_r5_rproc_unprepare,
>>   	.start		= zynqmp_r5_rproc_start,
>> @@ -642,6 +844,7 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
>>   {
>>   	struct zynqmp_r5_core *r5_core;
>>   	struct rproc *r5_rproc;
>> +	struct mbox_info *ipi;
>>   	int ret;
>>   
>>   	/* Set up DMA mask */
>> @@ -649,12 +852,23 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
>>   	if (ret)
>>   		return ERR_PTR(ret);
>>   
>> +	/*
>> +	 * If mailbox nodes are disabled using "status" property then setting up
>> +	 * mailbox channels will be failed. In that case we don't really need
>> +	 * kick() operation. Include .kick() only if mbox channels are acquired
>> +	 * successfully.
>> +	 */
>> +	ipi = zynqmp_r5_setup_mbox(cdev);
>> +	if (ipi)
>> +		zynqmp_r5_rproc_ops.kick = zynqmp_r5_rproc_kick;
>> +
>>   	/* Allocate remoteproc instance */
>>   	r5_rproc = rproc_alloc(cdev, dev_name(cdev),
>>   			       &zynqmp_r5_rproc_ops,
>>   			       NULL, sizeof(struct zynqmp_r5_core));
>>   	if (!r5_rproc) {
>>   		dev_err(cdev, "failed to allocate memory for rproc instance\n");
>> +		zynqmp_r5_free_mbox(ipi);
>>   		return ERR_PTR(-ENOMEM);
>>   	}
>>   
>> @@ -665,6 +879,7 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
>>   	if (!r5_core->np) {
>>   		dev_err(cdev, "can't get device node for r5 core\n");
>>   		ret = -EINVAL;
>> +		zynqmp_r5_free_mbox(ipi);
>>   		goto free_rproc;
>>   	}
>>   
>> @@ -672,10 +887,17 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
>>   	ret = rproc_add(r5_rproc);
>>   	if (ret) {
>>   		dev_err(cdev, "failed to add r5 remoteproc\n");
>> +		zynqmp_r5_free_mbox(ipi);
>>   		goto free_rproc;
>>   	}
>>   
>> +	if (ipi) {
>> +		r5_core->ipi = ipi;
>> +		ipi->r5_core = r5_core;
>> +	}
>> +
>>   	r5_core->rproc = r5_rproc;
>> +
>>   	return r5_core;
>>   
>>   free_rproc:
>> @@ -918,6 +1140,7 @@ static int zynqmp_r5_cluster_init(struct zynqmp_r5_cluster *cluster)
>>   	while (i >= 0) {
>>   		put_device(child_devs[i]);
>>   		if (r5_cores[i]) {
>> +			zynqmp_r5_free_mbox(r5_cores[i]->ipi);
> The mailboxes are initialized in zynqmp_r5_add_rproc_core() but free'd here in
> case of trouble, which introduces coupling between the two functions.  I suggest
> moving zynqmp_r5_setup_mbox() in zynqmp_r5_cluster_init() and initialize both
> mailboxes in it.
>
> I am done reviewing this set.


Ack. Yes that makes sense.

Thanks,

Tanmay


>
> Thanks,
> Mathieu
>
> Thanks,
> Mathieu
>
>>   			of_reserved_mem_device_release(r5_cores[i]->dev);
>>   			rproc_del(r5_cores[i]->rproc);
>>   			rproc_free(r5_cores[i]->rproc);
>> @@ -942,6 +1165,7 @@ static void zynqmp_r5_cluster_exit(void *data)
>>   
>>   	for (i = 0; i < cluster->core_count; i++) {
>>   		r5_core = cluster->r5_cores[i];
>> +		zynqmp_r5_free_mbox(r5_core->ipi);
>>   		of_reserved_mem_device_release(r5_core->dev);
>>   		put_device(r5_core->dev);
>>   		rproc_del(r5_core->rproc);
>> -- 
>> 2.25.1
>>