linux-kernel - Re: [PATCH 1/2] remoteproc: xlnx: disable unsupported features

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Message-ID: <b1ada416-dd27-4458-8929-bf7d144387cb@amd.com>
Date: Mon, 21 Jul 2025 11:40:40 -0500
From: Tanmay Shah <tanmay.shah@....com>
To: Mathieu Poirier <mathieu.poirier@...aro.org>,
 Peng Fan <peng.fan@....nxp.com>
Cc: andersson@...nel.org, linux-remoteproc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] remoteproc: xlnx: disable unsupported features



On 7/21/25 10:26 AM, Mathieu Poirier wrote:
> On Mon, Jul 21, 2025 at 02:57:24PM +0800, Peng Fan wrote:
>> On Wed, Jul 16, 2025 at 02:30:47PM -0700, Tanmay Shah wrote:
>>> AMD-Xilinx platform driver does not support iommu or recovery mechanism
>>> yet. Disable both features in platform driver.
>>>
>>> Signed-off-by: Tanmay Shah <tanmay.shah@....com>
>>> ---
>>> drivers/remoteproc/xlnx_r5_remoteproc.c | 2 ++
>>> 1 file changed, 2 insertions(+)
>>>
>>> diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c
>>> index a51523456c6e..0ffd26a47685 100644
>>> --- a/drivers/remoteproc/xlnx_r5_remoteproc.c
>>> +++ b/drivers/remoteproc/xlnx_r5_remoteproc.c
>>> @@ -938,6 +938,8 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev)
>>>
>>> 	rproc_coredump_set_elf_info(r5_rproc, ELFCLASS32, EM_ARM);
>>>
>>> +	r5_rproc->recovery_disabled = true;
>>
>> This does not block sysfs write if my understanding is correct.
>> recovery_store does not do any check. So even you set it to true,
>> user could still write sysfs to set to false.
> 
> That is the case for all drivers and not specific to this one.

Yup, may be we can make recovery node read-only. Or introduce new flag 
in remoteproc structure and set by platform driver that decides if 
recovery can be controlled via sys-fs or not.

But that's a separate discussion and patch.

> 
>>
>>> +	r5_rproc->has_iommu = false;
>>
>> The default value should already be false. Is there a need to
>> set it to false?
> 
> I never mind to see things set explicitly.
> 
>>
>> Regards,
>> Peng
>>
>>> 	r5_rproc->auto_boot = false;
>>> 	r5_core = r5_rproc->priv;
>>> 	r5_core->dev = cdev;
>>> -- 
>>> 2.34.1
>>>
>