Re: [PATCH 09/19] dma-buf-map: Add wrapper over memset

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

Am 27.01.22 um 16:38 schrieb Lucas De Marchi:
> On Thu, Jan 27, 2022 at 03:54:21PM +0100, Thomas Zimmermann wrote:
> > Hi
> >
> > Am 26.01.22 um 21:36 schrieb Lucas De Marchi:
> > > Just like memcpy_toio(), there is also need to write a direct value to a
> > > memory block. Add dma_buf_map_memset() to abstract memset() vs 
> > > memset_io()
> > >
> > > Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
> > > Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
> > > Cc: Christian König <christian.koenig@xxxxxxx>
> > > Cc: linux-media@xxxxxxxxxxxxxxx
> > > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > > Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
> > > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > > Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> > > ---
> > >  include/linux/dma-buf-map.h | 17 +++++++++++++++++
> > >  1 file changed, 17 insertions(+)
> > >
> > > diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-map.h
> > > index 3514a859f628..c9fb04264cd0 100644
> > > --- a/include/linux/dma-buf-map.h
> > > +++ b/include/linux/dma-buf-map.h
> > > @@ -317,6 +317,23 @@ static inline void dma_buf_map_memcpy_to(struct 
> > > dma_buf_map *dst, const void *sr
> > >          memcpy(dst->vaddr, src, len);
> > >  }
> > > +/**
> > > + * dma_buf_map_memset - Memset into dma-buf mapping
> > > + * @dst:    The dma-buf mapping structure
> > > + * @value:    The value to set
> > > + * @len:    The number of bytes to set in dst
> > > + *
> > > + * Set value in dma-buf mapping. Depending on the buffer's location, 
> > > the helper
> > > + * picks the correct method of accessing the memory.
> > > + */
> > > +static inline void dma_buf_map_memset(struct dma_buf_map *dst, int 
> > > value, size_t len)
> > > +{
> > > +    if (dst->is_iomem)
> > > +        memset_io(dst->vaddr_iomem, value, len);
> > > +    else
> > > +        memset(dst->vaddr, value, len);
> > > +}
> >
> > Maybe add an offset parameter here.
>
> yep, on v2 I will have 2 APIs, one with and one without offset.

Please, no. Just add the parameter here and pass 0 if yo don't need it.

Best regards
Thomas

> thanks
> Lucas De Marchi
>
> > Best regards
> > Thomas
> >
> > > +
> > >  /**
> > >   * dma_buf_map_incr - Increments the address stored in a dma-buf 
> > > mapping
> > >   * @map:    The dma-buf mapping structure
> >
> > --
> > Thomas Zimmermann
> > Graphics Driver Developer
> > SUSE Software Solutions Germany GmbH
> > Maxfeldstr. 5, 90409 Nürnberg, Germany
> > (HRB 36809, AG Nürnberg)
> > Geschäftsführer: Ivo Totev

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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