linux-kernel - Re: [PATCH v5 1/3] dt-bindings: mailbox: add google,gs101-mbox

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Message-ID: <8f21d5f2-5327-488c-878c-a62d85857240@linaro.org>
Date: Wed, 8 Jan 2025 09:38:08 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Jassi Brar <jassisinghbrar@...il.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski <krzk@...nel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>, linux-kernel@...r.kernel.org,
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, andre.draszik@...aro.org,
 peter.griffin@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com,
 daniel.lezcano@...aro.org, vincent.guittot@...aro.org,
 ulf.hansson@...aro.org, arnd@...db.de
Subject: Re: [PATCH v5 1/3] dt-bindings: mailbox: add google,gs101-mbox

Hi, Jassi,

On 1/3/25 9:57 AM, Tudor Ambarus wrote:
>>> Then I updated the mailbox core to allow clients to request channels by
>>> passing some args containing channel identifiers to the controllers,
>>> that the controllers xlate() using their own method.
>>>
>> This is unnecessary.
>> If you don't pass the doorbell number from DT, each channel populated
>> by the driver is just a s/w construct or a 'virtual' channel. Make use
>> of 'void *data'  in send_data() to specify the doorbell.
>>
> I think this introduces concurrency problems if the channel identifiers
> passed by 'void *data' don't match the virtual channel used for sending
> the messages. Do we want to allow this?
> 
> Also, if we use 'void *data' to pass channel identifiers, the channel
> checks will have to be made at send_data() time. Thus if passing wrong
> channel type for example, the mailbox client will eventually get a
> -ENOBUFS and a "Try increasing MBOX_TX_QUEUE_LEN" message, which I find
> misleading.

Shall I still use 'void *data' to pass channel identifiers through
send_data()? I'd like to respin everything.

Thanks!
ta