linux-kernel - Re: [PATCH v8 2/7] iommu/arm-smmu-v3: support ops registration for CDX bus

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Date:   Wed, 22 Feb 2023 11:10:37 +0530
From:   Nipun Gupta <nipun.gupta@....com>
To:     Robin Murphy <robin.murphy@....com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, gregkh@...uxfoundation.org,
        rafael@...nel.org, eric.auger@...hat.com,
        alex.williamson@...hat.com, cohuck@...hat.com,
        song.bao.hua@...ilicon.com, mchehab+huawei@...nel.org,
        maz@...nel.org, f.fainelli@...il.com, jeffrey.l.hugo@...il.com,
        saravanak@...gle.com, Michael.Srba@...nam.cz, mani@...nel.org,
        yishaih@...dia.com, jgg@...pe.ca, jgg@...dia.com, will@...nel.org,
        joro@...tes.org, masahiroy@...nel.org, ndesaulniers@...gle.com,
        rdunlap@...radead.org, linux-arm-kernel@...ts.infradead.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     okaya@...nel.org, harpreet.anand@....com, nikhil.agarwal@....com,
        michal.simek@....com, git@....com
Subject: Re: [PATCH v8 2/7] iommu/arm-smmu-v3: support ops registration for
 CDX bus



On 2/21/2023 5:26 PM, Robin Murphy wrote:
> Caution: This message originated from an External Source. Use proper 
> caution when opening attachments, clicking links, or responding.
> 
> 
> On 2023-02-17 13:28, Nipun Gupta wrote:
> 
> Nit: subject should be "iommu: Support ops registration for CDX bus",
> since this is no longer a driver-specific thing.

Sure, will update the subject in the next spin.

Thanks,
Nipun

> 
> Thanks,
> Robin.
> 
>> With new CDX bus supported for AMD FPGA devices on ARM
>> platform, the bus requires registration for the SMMU v3
>> driver.
>>
>> Signed-off-by: Nipun Gupta <nipun.gupta@....com>
>> Tested-by: Nikhil Agarwal <nikhil.agarwal@....com>
>> ---
>>   drivers/iommu/iommu.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
>> index 1fbe53354532..c2ff7754a4b3 100644
>> --- a/drivers/iommu/iommu.c
>> +++ b/drivers/iommu/iommu.c
>> @@ -28,6 +28,7 @@
>>   #include <linux/fsl/mc.h>
>>   #include <linux/module.h>
>>   #include <linux/cc_platform.h>
>> +#include <linux/cdx/cdx_bus.h>
>>   #include <trace/events/iommu.h>
>>   #include <linux/sched/mm.h>
>>   #include <linux/msi.h>
>> @@ -129,6 +130,9 @@ static struct bus_type * const iommu_buses[] = {
>>   #ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
>>       &host1x_context_device_bus_type,
>>   #endif
>> +#ifdef CONFIG_CDX_BUS
>> +     &cdx_bus_type,
>> +#endif
>>   };
>>
>>   /*