linux-kernel - Re: [PATCH 00/13] Introduce IOMMU-API TLB Flushing Interface

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Message-ID: <20170817144308.GI16908@8bytes.org>
Date:   Thu, 17 Aug 2017 16:43:08 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: Re: [PATCH 00/13] Introduce IOMMU-API TLB Flushing Interface

Hi Alex,

On Thu, Aug 17, 2017 at 08:35:20AM -0600, Alex Williamson wrote:
> Wouldn't it be much more friendly to downstreams and out-of-tree
> drivers to introduce new functions for the async semantics?  ie.
> iommu_map_async(), etc.  The API also seems a little cleaner that
> iommu_map() stands alone, it's synchronous, iommu_map_async() is
> explicitly asynchronous and a _flush() call is needed to finalize it.
> What do you see as the advantage to the approach here?  Thanks,

The reason I did it this way was that I want the iommu_map(),
iommu_unmap(), and iomu_map_sg() functions be considered the _default_
to chose when using the IOMMU-API, because their use is faster than
using the _sync() variants. Or in other words, I want the _sync function
names to imply that they are slower versions of the default ones.


Regards,

	Joerg