linux-kernel - Re: [PATCH v9 7/7] iommu/riscv: Paging domain support

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Message-ID: <20241015162045.GO1825128@ziepe.ca>
Date: Tue, 15 Oct 2024 13:20:45 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Tomasz Jeznach <tjeznach@...osinc.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Anup Patel <apatel@...tanamicro.com>,
	Sunil V L <sunilvl@...tanamicro.com>,
	Nick Kossifidis <mick@....forth.gr>,
	Sebastien Boeuf <seb@...osinc.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	iommu@...ts.linux.dev, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux@...osinc.com,
	Lu Baolu <baolu.lu@...ux.intel.com>, Zong Li <zong.li@...ive.com>
Subject: Re: [PATCH v9 7/7] iommu/riscv: Paging domain support

On Thu, Oct 10, 2024 at 12:48:10PM -0700, Tomasz Jeznach wrote:

> @@ -856,7 +1445,7 @@ static struct iommu_domain riscv_iommu_identity_domain = {
>  
>  static int riscv_iommu_device_domain_type(struct device *dev)
>  {
> -	return IOMMU_DOMAIN_IDENTITY;
> +	return 0;
>  }

Remove the function please instead of returning 0

> +static void riscv_iommu_release_device(struct device *dev)
> +{
> +	struct riscv_iommu_info *info = dev_iommu_priv_get(dev);
> +
> +	synchronize_rcu();
> +	kfree(info);
> +}

Just call kfree_rcu() ? We have a variation that doesn't require the
rcu_head now.

Jason