Re: [PATCH 02/19] iosys-map: Add offset to iosys_map_memcpy_to()

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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@xxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>

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

---
  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);
  }
/**




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