linux-kernel - Re: [PATCH 02/19] iosys-map: Add offset to iosys_map_memcpy

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Date:   Fri, 4 Feb 2022 19:35:40 +0100
From:   Christian König <christian.koenig@....com>
To:     Lucas De Marchi <lucas.demarchi@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     John Harrison <John.C.Harrison@...el.com>,
        Matthew Brost <matthew.brost@...el.com>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/19] iosys-map: Add offset to iosys_map_memcpy_to()

Am 04.02.22 um 18:44 schrieb Lucas De Marchi:
> In certain situations it's useful to be able to write to an
> offset of the mapping. Add a dst_offset to iosys_map_memcpy_to().
>
> Cc: Sumit Semwal <sumit.semwal@...aro.org>
> Cc: Christian König <christian.koenig@....com>
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Lucas De Marchi <lucas.demarchi@...el.com>

Reviewed-by: Christian König <christian.koenig@....com>

> ---
>   drivers/gpu/drm/drm_cache.c     |  2 +-
>   drivers/gpu/drm/drm_fb_helper.c |  2 +-
>   include/linux/iosys-map.h       | 17 +++++++++--------
>   3 files changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
> index 66597e411764..c3e6e615bf09 100644
> --- a/drivers/gpu/drm/drm_cache.c
> +++ b/drivers/gpu/drm/drm_cache.c
> @@ -218,7 +218,7 @@ static void memcpy_fallback(struct iosys_map *dst,
>   	if (!dst->is_iomem && !src->is_iomem) {
>   		memcpy(dst->vaddr, src->vaddr, len);
>   	} else if (!src->is_iomem) {
> -		iosys_map_memcpy_to(dst, src->vaddr, len);
> +		iosys_map_memcpy_to(dst, 0, src->vaddr, len);
>   	} else if (!dst->is_iomem) {
>   		memcpy_fromio(dst->vaddr, src->vaddr_iomem, len);
>   	} else {
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 238f815cb2a0..bf5cc9a42e5a 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -385,7 +385,7 @@ static void drm_fb_helper_damage_blit_real(struct drm_fb_helper *fb_helper,
>   	iosys_map_incr(dst, offset); /* go to first pixel within clip rect */
>   
>   	for (y = clip->y1; y < clip->y2; y++) {
> -		iosys_map_memcpy_to(dst, src, len);
> +		iosys_map_memcpy_to(dst, 0, src, len);
>   		iosys_map_incr(dst, fb->pitches[0]);
>   		src += fb->pitches[0];
>   	}
> diff --git a/include/linux/iosys-map.h b/include/linux/iosys-map.h
> index f4186f91caa6..edd7fa3be9e9 100644
> --- a/include/linux/iosys-map.h
> +++ b/include/linux/iosys-map.h
> @@ -220,22 +220,23 @@ static inline void iosys_map_clear(struct iosys_map *map)
>   }
>   
>   /**
> - * iosys_map_memcpy_to - Memcpy into iosys mapping
> + * iosys_map_memcpy_to_offset - Memcpy into offset of iosys_map
>    * @dst:	The iosys_map structure
> + * @dst_offset:	The offset from which to copy
>    * @src:	The source buffer
>    * @len:	The number of byte in src
>    *
> - * Copies data into a iosys mapping. The source buffer is in system
> - * memory. Depending on the buffer's location, the helper picks the correct
> - * method of accessing the memory.
> + * Copies data into a iosys_map with an offset. The source buffer is in
> + * system memory. Depending on the buffer's location, the helper picks the
> + * correct method of accessing the memory.
>    */
> -static inline void iosys_map_memcpy_to(struct iosys_map *dst, const void *src,
> -				       size_t len)
> +static inline void iosys_map_memcpy_to(struct iosys_map *dst, size_t dst_offset,
> +				       const void *src, size_t len)
>   {
>   	if (dst->is_iomem)
> -		memcpy_toio(dst->vaddr_iomem, src, len);
> +		memcpy_toio(dst->vaddr_iomem + dst_offset, src, len);
>   	else
> -		memcpy(dst->vaddr, src, len);
> +		memcpy(dst->vaddr + dst_offset, src, len);
>   }
>   
>   /**