linux-kernel - Re: [PATCH v5 1/6] iommu: add generic boot option iommu.dma

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Message-ID: <20190412111649.GK4518@8bytes.org>
Date:   Fri, 12 Apr 2019 13:16:50 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        John Garry <john.garry@...wei.com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Jonathan Corbet <corbet@....net>,
        linux-doc <linux-doc@...r.kernel.org>,
        Sebastian Ott <sebott@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        David Woodhouse <dwmw2@...radead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        x86 <x86@...nel.org>, linux-ia64 <linux-ia64@...r.kernel.org>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v5 1/6] iommu: add generic boot option iommu.dma_mode

On Tue, Apr 09, 2019 at 08:53:03PM +0800, Zhen Lei wrote:
> +static int __init iommu_dma_mode_setup(char *str)
> +{
> +	if (!str)
> +		goto fail;
> +
> +	if (!strncmp(str, "passthrough", 11))
> +		iommu_default_dma_mode = IOMMU_DMA_MODE_PASSTHROUGH;
> +	else if (!strncmp(str, "lazy", 4))
> +		iommu_default_dma_mode = IOMMU_DMA_MODE_LAZY;
> +	else if (!strncmp(str, "strict", 6))
> +		iommu_default_dma_mode = IOMMU_DMA_MODE_STRICT;
> +	else
> +		goto fail;
> +
> +	pr_info("Force dma mode to be %d\n", iommu_default_dma_mode);

Printing a number is not very desriptive or helpful to the user. Please
print the name of the mode instead.


Regards,

	Joerg