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 <[email protected]>
> Cc: Christian König <[email protected]>
> Cc: Thomas Zimmermann <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Signed-off-by: Lucas De Marchi <[email protected]>
Reviewed-by: Christian König <[email protected]>
> ---
> 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);
> }
>
> /**