linux-kernel - Re: [PATCH v3 11/20] iommu/fsl_pamu: Add set_platform

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Date:   Tue, 29 Nov 2022 11:46:33 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Rob Clark <robdclark@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Yong Wu <yong.wu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Thierry Reding <thierry.reding@...il.com>,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 11/20] iommu/fsl_pamu: Add set_platform_dma callback

On 11/28/22 10:14 PM, Jason Gunthorpe wrote:
> On Mon, Nov 28, 2022 at 02:46:39PM +0800, Lu Baolu wrote:
>> This IOMMU driver doesn't support default domain. Add the implementation
>> of set_platform_dma callback so that the IOMMU core could return the
>> DMA control.
>>
>> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
>> ---
>>   drivers/iommu/fsl_pamu_domain.c | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
>> index 4408ac3c49b6..b8c716e7c424 100644
>> --- a/drivers/iommu/fsl_pamu_domain.c
>> +++ b/drivers/iommu/fsl_pamu_domain.c
>> @@ -314,6 +314,14 @@ static void fsl_pamu_detach_device(struct iommu_domain *domain,
>>   		pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node);
>>   }
>>   
>> +static void fsl_pamu_set_platform_dma(struct device *dev)
>> +{
>> +	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
>> +
>> +	if (domain)
>> +		fsl_pamu_detach_device(domain, dev);
>> +}
> This is a bit ugly, it would be better to make the previous patch call
> set_platform_dma if it is set instead of detach_dev and then these
> patches should just rename the driver's fsl_pamu_detach_device to
> fsl_pamu_set_platform_dma
> 
> Then the last patch just deletes the op and the core code

Yes. That's better. I will update the series.

Best regards,
baolu