linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: Add a configurable tlbi_range_max_n

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Message-ID: <ZN0Iqf9xrCEOOXUJ@nvidia.com>
Date:   Wed, 16 Aug 2023 14:34:33 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Nicolin Chen <nicolinc@...dia.com>
Cc:     will@...nel.org, robin.murphy@....com, joro@...tes.org,
        jean-philippe@...aro.org, apopple@...dia.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev
Subject: Re: [PATCH] iommu/arm-smmu-v3: Add a configurable
 tlbi_range_max_n_shift for TLBI

On Wed, Aug 16, 2023 at 10:09:20AM -0700, Nicolin Chen wrote:
> > This seems convoluted for a uapi, you should just make it
> > 'invalidate_threshold' in bytes or something simpler.
> 
> Hmm. That'd be a direct 64-bit size configuration, and very likely
> to be at upper 32-bit range, so I feel the value would be very big
> that might be hard to read.

hard to read is fine, it is sysfs

Jason