On Sun, Apr 05, 2020 at 10:47:49AM -0400, Alex Deucher wrote:
> On Fri, Mar 27, 2020 at 12:23 PM Marek Szyprowski
> wrote:
> >
> > Scatterlist elements contains both pages and DMA addresses, but one
> > should not assume 1:1 relation between them. The sg->length is the size
> > of the physical mem
On Fri, Mar 27, 2020 at 12:23 PM Marek Szyprowski
wrote:
>
> Scatterlist elements contains both pages and DMA addresses, but one
> should not assume 1:1 relation between them. The sg->length is the size
> of the physical memory chunk described by the sg->page, while
> sg_dma_len(sg) is the size of
; David Airlie
>; Shane Francis ;
>sta...@vger.kernel.org; Thomas Zimmermann ;
>Alex Deucher
>Subject: Re: [PATCH v2] drm/prime: fix extracting of the DMA addresses from
>a scatterlist
>
>Hi Michael,
>
>> Is there an example of what the scatterlist would look like in t
Cc: Marek Szyprowski ;
sta...@vger.kernel.org; Bartlomiej Zolnierkiewicz
; Maarten Lankhorst
; Maxime Ripard
; Thomas Zimmermann ;
David Airlie ; Daniel Vetter ; Alex Deucher
; Shane Francis ;
Ruhl, Michael J
Subject: [PATCH v2] drm/prime: fix extracting of the DMA addresses from a
scatterlist
t;> Cc: Marek Szyprowski ;
>> sta...@vger.kernel.org; Bartlomiej Zolnierkiewicz
>> ; Maarten Lankhorst
>> ; Maxime Ripard
>> ; Thomas Zimmermann ;
>> David Airlie ; Daniel Vetter ; Alex
>> Deucher
>> ; Shane Francis ;
>> Ruhl, Michael J
>>
On Fri, Mar 27, 2020 at 6:31 PM Ruhl, Michael J
wrote:
> Is there an example of what the scatterlist would look like in this case?
>
> Does each SG entry always have the page and dma info? or could you have
> entries that have page information only, and entries that have dma info only?
>
> If the
On Fri, Mar 27, 2020 at 05:21:26PM +0100, Marek Szyprowski wrote:
> Scatterlist elements contains both pages and DMA addresses, but one
> should not assume 1:1 relation between them. The sg->length is the size
> of the physical memory chunk described by the sg->page, while
> sg_dma_len(sg) is the s
>; Maarten Lankhorst
>; Maxime Ripard
>; Thomas Zimmermann ;
>David Airlie ; Daniel Vetter ; Alex Deucher
>; Shane Francis ;
>Ruhl, Michael J
>Subject: [PATCH v2] drm/prime: fix extracting of the DMA addresses from a
>scatterlist
>
>Scatterlist elements contains both page
Scatterlist elements contains both pages and DMA addresses, but one
should not assume 1:1 relation between them. The sg->length is the size
of the physical memory chunk described by the sg->page, while
sg_dma_len(sg) is the size of the DMA (IO virtual) chunk described by
the sg_dma_address(sg).
Th
