linux-kernel - Re: [PATCH v4 3/3] iommu/tegra-smmu: Add PCI support

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Date:   Fri, 2 Oct 2020 17:35:24 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>, thierry.reding@...il.com,
        joro@...tes.org
Cc:     vdumpa@...dia.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] iommu/tegra-smmu: Add PCI support

02.10.2020 09:08, Nicolin Chen пишет:
> @@ -865,7 +866,11 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
>  	group->smmu = smmu;
>  	group->soc = soc;
>  
> -	group->group = iommu_group_alloc();
> +	if (dev_is_pci(dev))
> +		group->group = pci_device_group(dev);
> +	else
> +		group->group = generic_device_group(dev);
> +
>  	if (IS_ERR(group->group)) {
>  		devm_kfree(smmu->dev, group);
>  		mutex_unlock(&smmu->lock);
> @@ -1069,22 +1074,32 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
>  	iommu_device_set_fwnode(&smmu->iommu, dev->fwnode);
>  
>  	err = iommu_device_register(&smmu->iommu);
> -	if (err) {
> -		iommu_device_sysfs_remove(&smmu->iommu);
> -		return ERR_PTR(err);
> -	}
> +	if (err)
> +		goto err_sysfs;
>  
>  	err = bus_set_iommu(&platform_bus_type, &tegra_smmu_ops);
> -	if (err < 0) {
> -		iommu_device_unregister(&smmu->iommu);
> -		iommu_device_sysfs_remove(&smmu->iommu);
> -		return ERR_PTR(err);
> -	}
> +	if (err < 0)
> +		goto err_unregister;
> +
> +#ifdef CONFIG_PCI
> +	err = bus_set_iommu(&pci_bus_type, &tegra_smmu_ops);
> +	if (err < 0)
> +		goto err_bus_set;
> +#endif
>  
>  	if (IS_ENABLED(CONFIG_DEBUG_FS))
>  		tegra_smmu_debugfs_init(smmu);
>  
>  	return smmu;
> +
> +err_bus_set: __maybe_unused;

__maybe_unused?