linux-kernel - Re: [PATCH 2/2] remoteproc: imx_dsp_rproc: add module parameter to ignore ready flag from remote processor

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Message-ID: <6fe5691f-67f4-ff70-8350-b4b6c08097b0@nxp.com>
Date:   Tue, 18 Jul 2023 11:30:43 +0300
From:   Iuliana Prodan <iuliana.prodan@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        "Iuliana Prodan (OSS)" <iuliana.prodan@....nxp.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "S.J. Wang" <shengjiu.wang@....com>,
        Fabio Estevam <festevam@...il.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Mpuaudiosw <Mpuaudiosw@....com>, linux-imx <linux-imx@....com>,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        LnxRevLi <LnxRevLi@....com>
Subject: Re: [PATCH 2/2] remoteproc: imx_dsp_rproc: add module parameter to
 ignore ready flag from remote processor

Hi Mathieu,

On 7/17/2023 8:34 PM, Mathieu Poirier wrote:
> Hi Iuliana,
>
> On Thu, Jul 13, 2023 at 01:42:51AM +0300, Iuliana Prodan (OSS) wrote:
>> From: Iuliana Prodan <iuliana.prodan@....com>
>>
>> There are cases when we want to test samples that do not
>> reply with FW READY message, after fw is loaded and the
>> remote processor started.
> This seems like a bug to me - where is this FW comes from?
The firmware is a generic sample from Zephyr repo: 
https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/ipc/openamp_rsc_table

There is no bug, this is how the application was written.

Rather than modifying a generic sample for i.MX usecase, I prefer doing 
an "insmod imx_dsp_rproc.ko ignore_dsp_ready=1" just for this sample.

Thanks,
Iulia

>> In these cases, do not wait for a confirmation from the remote processor
>> at start.
>>
>> Added "ignore_dsp_ready" flag while inserting the module to ignore
>> remote processor reply after start.
>> By default, this is off - do not ignore reply from rproc.
>>
>> Signed-off-by: Iuliana Prodan <iuliana.prodan@....com>
>>
>> ---
>> This was discovered while testing openamp_rsc_table sample from Zephyr
>> repo (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fzephyrproject-rtos%2Fzephyr%2Ftree%2Fmain%2Fsamples%2Fsubsys%2Fipc%2Fopenamp_rsc_table&data=05%7C01%7Ciuliana.prodan%40nxp.com%7C4779cb20393e4af08a9408db86ec191e%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638252120814415013%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=iCjvv8wr3sQ4CEXFcXDsW0VSw5RXr1ASw7LN2J08SXE%3D&reserved=0).
>>
>> We have IPC, but the remote proc doesn't send a FW_READY reply.
>> ---
>>   drivers/remoteproc/imx_dsp_rproc.c | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
>>
>> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
>> index b5634507d953..ed89de2f3b98 100644
>> --- a/drivers/remoteproc/imx_dsp_rproc.c
>> +++ b/drivers/remoteproc/imx_dsp_rproc.c
>> @@ -36,7 +36,13 @@ module_param_named(no_mailboxes, no_mailboxes, int, 0644);
>>   MODULE_PARM_DESC(no_mailboxes,
>>   		 "There is no mailbox between cores, so ignore remote proc reply after start, default is 0 (off).");
>>   
>> +static unsigned int imx_dsp_rproc_ignore_ready;
>> +module_param_named(ignore_dsp_ready, imx_dsp_rproc_ignore_ready, int, 0644);
>> +MODULE_PARM_DESC(ignore_dsp_ready,
>> +		 "Ignore remote proc reply after start, default is 0 (off).");
>> +
>>   #define REMOTE_IS_READY				BIT(0)
>> +#define REMOTE_IGNORE_READY_REPLY	BIT(1)
>>   #define REMOTE_READY_WAIT_MAX_RETRIES		500
>>   
>>   /* att flags */
>> @@ -296,6 +302,12 @@ static int imx_dsp_rproc_ready(struct rproc *rproc)
>>   	if (!priv->rxdb_ch)
>>   		return 0;
>>   
>> +	/*
>> +	 * FW_READY reply is optional/ignored, so don't wait for it.
>> +	 */
>> +	if (priv->flags & REMOTE_IGNORE_READY_REPLY)
>> +		return 0;
>> +
>>   	for (i = 0; i < REMOTE_READY_WAIT_MAX_RETRIES; i++) {
>>   		if (priv->flags & REMOTE_IS_READY)
>>   			return 0;
>> @@ -1119,6 +1131,9 @@ static int imx_dsp_rproc_probe(struct platform_device *pdev)
>>   	else
>>   		imx_dsp_rproc_mbox_init = imx_dsp_rproc_mbox_alloc;
>>   
>> +	if (imx_dsp_rproc_ignore_ready)
>> +		priv->flags |= REMOTE_IGNORE_READY_REPLY;
>> +
>>   	dev_set_drvdata(dev, rproc);
>>   
>>   	INIT_WORK(&priv->rproc_work, imx_dsp_rproc_vq_work);
>> -- 
>> 2.17.1
>>