iosys-map: Add offset to iosys_map_memcpy_to()

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@linaro.org>
Cc: Christian König <christian.koenig@amd.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220216174147.3073235-2-lucas.demarchi@intel.com

diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 4bb093c..4b0da6b 100644 (file)
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -221,7 +221,7 @@ 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 e9a9d35..6f72627 100644 (file)
--- 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 f4186f9..edd730b 100644 (file)
--- 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 - 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);
 }
 
 /**