linux-kernel - Re: [RFC v1 1/4] dma-mapping: introduce the DMA_ATTR_MAY

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Message-ID: <730b79b3-5adb-c8a2-8eb5-8790860fc1a3@gmail.com>
Date:   Fri, 31 Mar 2023 20:06:37 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Petr Tesarik <petrtesarik@...weicloud.com>,
        Jonathan Corbet <corbet@....net>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Borislav Petkov <bp@...e.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Kim Phillips <kim.phillips@....com>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DMA MAPPING HELPERS" <iommu@...ts.linux.dev>
Cc:     Roberto Sassu <roberto.sassu@...wei.com>, petr@...arici.cz
Subject: Re: [RFC v1 1/4] dma-mapping: introduce the DMA_ATTR_MAY_SLEEP
 attribute

On 3/20/23 19:28, Petr Tesarik wrote:
> +
> +DMA_ATTR_MAY_SLEEP
> +------------------
> +
> +This tells the DMA-mapping subsystem that it is allowed to sleep. For example,
> +if mapping needs a bounce buffer, software IO TLB may use CMA for the
> +allocation if this flag is given.
> +
> +This attribute is not used for dma_alloc_* functions. Instead, the provided
                                  dma_alloc_\* (escape wildcard in order to
                                                not confuse Sphinx for emphasis).
> +GFP flags are used to determine whether the allocation may sleep.

Otherwise the doc LGTM.

-- 
An old man doll... just what I always wanted! - Clara