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Message-ID: <89cbae17-58dd-4c06-9f24-0c651209f037@linux.intel.com>
Date: Wed, 1 May 2024 17:53:48 +0800
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Cc: baolu.lu@linux.intel.com, Palmer Dabbelt <palmer@dabbelt.com>,
 Albert Ou <aou@eecs.berkeley.edu>, Anup Patel <apatel@ventanamicro.com>,
 Sunil V L <sunilvl@ventanamicro.com>, Nick Kossifidis <mick@ics.forth.gr>,
 Sebastien Boeuf <seb@rivosinc.com>, Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor Dooley
 <conor+dt@kernel.org>, devicetree@vger.kernel.org, iommu@lists.linux.dev,
 linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
 linux@rivosinc.com
Subject: Re: [PATCH v3 4/7] iommu/riscv: Enable IOMMU registration and device
 probe.
To: Tomasz Jeznach <tjeznach@rivosinc.com>, Joerg Roedel <joro@8bytes.org>,
 Will Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>,
 Paul Walmsley <paul.walmsley@sifive.com>
References: <cover.1714494653.git.tjeznach@rivosinc.com>
 <f9c9e5dcdc1457da4af70302e85c0a7be532f650.1714494653.git.tjeznach@rivosinc.com>
Content-Language: en-US
From: Baolu Lu <baolu.lu@linux.intel.com>
In-Reply-To: <f9c9e5dcdc1457da4af70302e85c0a7be532f650.1714494653.git.tjeznach@rivosinc.com>
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On 2024/5/1 4:01, Tomasz Jeznach wrote:
> Advertise IOMMU device and its core API.
> Only minimal implementation for single identity domain type, without
> per-group domain protection.
> 
> Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com>

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>

with some nits below.

> ---
>   drivers/iommu/riscv/iommu.c | 64 +++++++++++++++++++++++++++++++++++++
>   1 file changed, 64 insertions(+)

[..]

>   static int riscv_iommu_init_check(struct riscv_iommu_device *iommu)
>   {
>   	u64 ddtp;
> @@ -71,6 +126,7 @@ static int riscv_iommu_init_check(struct riscv_iommu_device *iommu)
>   
>   void riscv_iommu_remove(struct riscv_iommu_device *iommu)
>   {
> +	iommu_device_unregister(&iommu->iommu);
>   	iommu_device_sysfs_remove(&iommu->iommu);
>   }
>   
> @@ -96,8 +152,16 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu)
>   		goto err_sysfs;
>   	}
>   
> +	rc = iommu_device_register(&iommu->iommu, &riscv_iommu_ops, iommu->dev);
> +	if (rc) {
> +		dev_err_probe(iommu->dev, rc, "cannot register iommu interface\n");
> +		goto err_iommu;
> +	}
> +
>   	return 0;
>   
> +err_iommu:
> +	iommu_device_sysfs_remove(&iommu->iommu);
>   err_sysfs:
>   	return rc;
>   }

It's better to make the goto label indicate what is going to be handled.
So it's more readable to make it like this:

err_remove_sysfs:
	iommu_device_sysfs_remove(&iommu->iommu);

Best regards,
baolu