linux-kernel - Re: [PATCH v2 6/9] Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular"

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Message-ID: <7e906ed1-ab85-7e25-9b29-5497e98da8d8@huawei.com>
Date:   Fri, 8 Nov 2019 16:44:25 +0000
From:   John Garry <john.garry@...wei.com>
To:     Will Deacon <will@...nel.org>, <iommu@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     "Isaac J. Manjarres" <isaacm@...eaurora.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Saravana Kannan <saravanak@...gle.com>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v2 6/9] Revert "iommu/arm-smmu: Make arm-smmu-v3
 explicitly non-modular"

On 08/11/2019 16:17, John Garry wrote:
> On 08/11/2019 15:16, Will Deacon wrote:
>> +MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
> 
> Hi Will,
> 
>>   static struct platform_driver arm_smmu_driver = {
>>       .driver    = {
>>           .name        = "arm-smmu-v3",
>>           .of_match_table    = of_match_ptr(arm_smmu_of_match),
>> -        .suppress_bind_attrs = true,
> 
> Does this mean that we can now manually unbind this driver from the SMMU 
> device?
> 
> Seems dangerous. Here's what happens for me:
> 
> root@...ntu:/sys# cd ./bus/platform/drivers/arm-smmu-v3
> ind @ubuntu:/sys/bus/platform/drivers/arm-smmu-v3# echo 
> arm-smmu-v3.0.auto > unbind
> [   77.580351] hisi_sas_v2_hw HISI0162:01: CQE_AXI_W_ERR (0x800) found!
> ho [   78.635473] platform arm-smmu-v3.0.auto: CMD_SYNC timeout at 
> 0x00000146 [hwprod 0x00000146, hwcons 0x00000000]
> 
>>       },
>>       .probe    = arm_smmu_device_probe,
>> +    .remove    = arm_smmu_device_remove,
>>       .shutdown = arm_smmu_device_shutdown,
>>   };
>> -builtin_platform_driver(arm_smmu_driver);
>> +module_platform_driver(arm_smmu_driver);
>> +

BTW, it now looks like it was your v1 series I was testing there, on 
your branch iommu/module. It would be helpful to update for ease of testing.

Thanks,
John