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

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Message-ID: <ZN0JYO/of2qH0krp@Asurada-Nvidia>
Date:   Wed, 16 Aug 2023 10:37:36 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Jason Gunthorpe <jgg@...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 02:34:33PM -0300, Jason Gunthorpe wrote:
> 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

OK. I'd just do it in size then.

Thanks
Nic