linux-kernel - Re: [PATCH v7 06/16] drivers: iommu: arm-smmu-v3: convert struct device of

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Date:   Wed, 9 Nov 2016 14:44:07 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        iommu@...ts.linux-foundation.org
Cc:     Will Deacon <will.deacon@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Joerg Roedel <joro@...tes.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Tomasz Nowicki <tn@...ihalf.com>, Jon Masters <jcm@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Nate Watterson <nwatters@...eaurora.org>,
        Prem Mallappa <prem.mallappa@...adcom.com>,
        Dennis Chen <dennis.chen@....com>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 06/16] drivers: iommu: arm-smmu-v3: convert struct
 device of_node to fwnode usage

On 09/11/16 14:19, Lorenzo Pieralisi wrote:
> Current ARM SMMU v3 driver rely on the struct device.of_node pointer for
> device look-up and iommu_ops retrieval.
> 
> In preparation for ACPI probing enablement, convert the driver to use
> the struct device.fwnode member for device and iommu_ops look-up so that
> the driver infrastructure can be used also on systems that do not
> associate an of_node pointer to a struct device (eg ACPI), making the
> device look-up and iommu_ops retrieval firmware agnostic.
> 
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Tested-by: Hanjun Guo <hanjun.guo@...aro.org>
> Tested-by: Tomasz Nowicki <tn@...ihalf.com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Hanjun Guo <hanjun.guo@...aro.org>
> Cc: Robin Murphy <robin.murphy@....com>

Reviewed-by: Robin Murphy <robin.murphy@....com>

> ---
>  drivers/iommu/arm-smmu-v3.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index e6f9b2d..fef9f60 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -1723,13 +1723,14 @@ static struct platform_driver arm_smmu_driver;
>  
>  static int arm_smmu_match_node(struct device *dev, void *data)
>  {
> -	return dev->of_node == data;
> +	return dev->fwnode == data;
>  }
>  
> -static struct arm_smmu_device *arm_smmu_get_by_node(struct device_node *np)
> +static
> +struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
>  {
>  	struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
> -						np, arm_smmu_match_node);
> +						fwnode, arm_smmu_match_node);
>  	put_device(dev);
>  	return dev ? dev_get_drvdata(dev) : NULL;
>  }
> @@ -1765,7 +1766,7 @@ static int arm_smmu_add_device(struct device *dev)
>  		master = fwspec->iommu_priv;
>  		smmu = master->smmu;
>  	} else {
> -		smmu = arm_smmu_get_by_node(to_of_node(fwspec->iommu_fwnode));
> +		smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
>  		if (!smmu)
>  			return -ENODEV;
>  		master = kzalloc(sizeof(*master), GFP_KERNEL);
> @@ -2634,7 +2635,8 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
>  		return ret;
>  
>  	/* And we're up. Go go go! */
> -	of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
> +	fwnode_iommu_set_ops(dev->fwnode, &arm_smmu_ops);
> +
>  #ifdef CONFIG_PCI
>  	if (pci_bus_type.iommu_ops != &arm_smmu_ops) {
>  		pci_request_acs();
>