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From: Rob Clark <robdclark-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: "joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org"
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Subject: Re: [PATCH v5 1/1] iommu-api: Add map_sg/unmap_sg functions
Date: Mon, 18 Aug 2014 14:32:15 -0400	[thread overview]
Message-ID: <CAF6AEGtGmAQjMc5W5a6x5QiyUc8v0XHcsNAFe65Znc=DDKPS+w@mail.gmail.com> (raw)
In-Reply-To: <20140818140730.GC9809-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>

On Mon, Aug 18, 2014 at 10:07 AM, joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> wrote:
> On Tue, Aug 12, 2014 at 09:56:11AM -0700, Olav Haugan wrote:
>> On 8/12/2014 3:48 AM, Rob Clark wrote:
>> > iirc, one plan for 'flags' was some sort of DONT_FLUSH_TLB flag for
>> > drivers which wanted to map/unmap N buffers with a single flush at the
>> > end.  There might have been some other usages envisioned.
>>
>> Yes, that was the original intent of the flags for now. I am sure we can
>> find other uses for this in the future.
>
> Do you have anything else in mind already besides the DONT_FLUSH_TLB
> flag?
>
> How is the IOTLB supposed to be flushed when this flag is used?
>

well, I was thinking one of two ways:

1) add new flush() vfunc.. this, I think, would be most convenient for
drivers using this feature
2) or driver simply doesn't set DONT_FLUSH_TLB flag on the last
{map,unmap}..  that would be slightly more awkward to use, but would
avoid adding a new vfunc

BR,
-R

>         Joerg
>

WARNING: multiple messages have this Message-ID (diff)
From: robdclark@gmail.com (Rob Clark)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 1/1] iommu-api: Add map_sg/unmap_sg functions
Date: Mon, 18 Aug 2014 14:32:15 -0400	[thread overview]
Message-ID: <CAF6AEGtGmAQjMc5W5a6x5QiyUc8v0XHcsNAFe65Znc=DDKPS+w@mail.gmail.com> (raw)
In-Reply-To: <20140818140730.GC9809@8bytes.org>

On Mon, Aug 18, 2014 at 10:07 AM, joro at 8bytes.org <joro@8bytes.org> wrote:
> On Tue, Aug 12, 2014 at 09:56:11AM -0700, Olav Haugan wrote:
>> On 8/12/2014 3:48 AM, Rob Clark wrote:
>> > iirc, one plan for 'flags' was some sort of DONT_FLUSH_TLB flag for
>> > drivers which wanted to map/unmap N buffers with a single flush at the
>> > end.  There might have been some other usages envisioned.
>>
>> Yes, that was the original intent of the flags for now. I am sure we can
>> find other uses for this in the future.
>
> Do you have anything else in mind already besides the DONT_FLUSH_TLB
> flag?
>
> How is the IOTLB supposed to be flushed when this flag is used?
>

well, I was thinking one of two ways:

1) add new flush() vfunc.. this, I think, would be most convenient for
drivers using this feature
2) or driver simply doesn't set DONT_FLUSH_TLB flag on the last
{map,unmap}..  that would be slightly more awkward to use, but would
avoid adding a new vfunc

BR,
-R

>         Joerg
>

  parent reply	other threads:[~2014-08-18 18:32 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-11 22:45 [PATCH v5 0/1] Add iommu map_sg/unmap_sg API Olav Haugan
2014-08-11 22:45 ` Olav Haugan
2014-08-11 22:45 ` [PATCH v5 1/1] iommu-api: Add map_sg/unmap_sg functions Olav Haugan
2014-08-11 22:45   ` Olav Haugan
     [not found]   ` <1407797150-515-2-git-send-email-ohaugan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-08-12  1:35     ` Konrad Rzeszutek Wilk
2014-08-12  1:35       ` Konrad Rzeszutek Wilk
     [not found]       ` <20140812013559.GA25121-0iZWjJA6G8GSPmnEAIUT9EEOCMrvLtNR@public.gmane.org>
2014-08-12 16:53         ` Olav Haugan
2014-08-12 16:53           ` Olav Haugan
2014-08-12  1:51     ` Hiroshi Doyu
2014-08-12  1:51       ` Hiroshi Doyu
2014-08-12 10:48       ` Rob Clark
2014-08-12 10:48         ` Rob Clark
2014-08-12 16:56         ` Olav Haugan
2014-08-12 16:56           ` Olav Haugan
     [not found]           ` <53EA472B.3020900-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-08-18 14:07             ` joro-zLv9SwRftAIdnm+yROfE0A
2014-08-18 14:07               ` joro at 8bytes.org
     [not found]               ` <20140818140730.GC9809-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2014-08-18 18:32                 ` Rob Clark [this message]
2014-08-18 18:32                   ` Rob Clark
     [not found]                   ` <CAF6AEGtGmAQjMc5W5a6x5QiyUc8v0XHcsNAFe65Znc=DDKPS+w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-08-18 20:48                     ` Olav Haugan
2014-08-18 20:48                       ` Olav Haugan
     [not found]                       ` <53F266AE.40303-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-08-18 21:26                         ` joro-zLv9SwRftAIdnm+yROfE0A
2014-08-18 21:26                           ` joro at 8bytes.org
     [not found]                           ` <20140818212627.GI9809-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2014-08-18 21:32                             ` Olav Haugan
2014-08-18 21:32                               ` Olav Haugan
2014-08-12 16:55     ` Laurent Pinchart
2014-08-12 16:55       ` Laurent Pinchart
2014-08-12 17:10       ` Olav Haugan
2014-08-12 17:10         ` Olav Haugan
2014-08-18 21:55     ` Joerg Roedel
2014-08-18 21:55       ` Joerg Roedel
2014-08-18 22:47       ` Olav Haugan
2014-08-18 22:47         ` Olav Haugan
     [not found]         ` <53F2829C.2040809-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-08-19 11:59           ` Joerg Roedel
2014-08-19 11:59             ` Joerg Roedel
     [not found]             ` <20140819115954.GC16329-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2014-08-19 16:11               ` Laurent Pinchart
2014-08-19 16:11                 ` Laurent Pinchart
2014-08-19 18:40                 ` Olav Haugan
2014-08-19 18:40                   ` Olav Haugan
     [not found]                   ` <53F39A18.70409-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2014-08-19 20:52                     ` Laurent Pinchart
2014-08-19 20:52                       ` Laurent Pinchart
2014-08-20  5:21                       ` Thierry Reding
2014-08-20  5:21                         ` Thierry Reding
2014-08-20 13:02                       ` Konrad Rzeszutek Wilk
2014-08-20 13:02                         ` Konrad Rzeszutek Wilk
     [not found]                         ` <20140820130250.GA3120-0iZWjJA6G8GSPmnEAIUT9EEOCMrvLtNR@public.gmane.org>
2014-08-20 14:15                           ` Laurent Pinchart
2014-08-20 14:15                             ` Laurent Pinchart
2014-08-19 18:37               ` Olav Haugan
2014-08-19 18:37                 ` Olav Haugan
2014-09-25 17:01     ` Joerg Roedel
2014-09-25 17:01       ` Joerg Roedel
     [not found]       ` <20140925170108.GE8306-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2014-10-06 19:02         ` Olav Haugan
2014-10-06 19:02           ` Olav Haugan
2014-10-15  9:16           ` Thierry Reding
2014-10-15  9:16             ` Thierry Reding
2014-10-16 17:23             ` Olav Haugan
2014-10-16 17:23               ` Olav Haugan
2014-10-17  9:09               ` Joerg Roedel
2014-10-17  9:09                 ` Joerg Roedel

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