This function can be used by drivers that use damage clips and have
CMA GEM objects backed by non-coherent memory. Calling this function
in a plane's .atomic_update ensures that all the data in the backing
memory have been written to RAM.
v3: - Only sync data if using GEM objects backed by non-coherent memory.
- Use a drm_device pointer instead of device pointer in prototype
v5: - Rename to drm_fb_cma_sync_non_coherent
- Invert loops for better cache locality
- Only sync BOs that have the non-coherent flag
- Move to drm_fb_cma_helper.c to avoid circular dependency
Signed-off-by: Paul Cercueil <p...@crapouillou.net>
---
drivers/gpu/drm/drm_fb_cma_helper.c | 46 +++++++++++++++++++++++++++++
include/drm/drm_fb_cma_helper.h | 4 +++
2 files changed, 50 insertions(+)
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c
b/drivers/gpu/drm/drm_fb_cma_helper.c
index cb2349ad338d..69c57273b184 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -9,12 +9,14 @@
* Copyright (C) 2012 Red Hat
*/
+#include <drm/drm_damage_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_plane.h>
+#include <linux/dma-mapping.h>
#include <linux/module.h>
/**
@@ -97,3 +99,47 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer
*fb,
return paddr;
}
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
+
+/**
+ * drm_fb_cma_sync_non_coherent - Sync GEM object to non-coherent backing
+ * memory
+ * @drm: DRM device
+ * @old_state: Old plane state
+ * @state: New plane state
+ *
+ * This function can be used by drivers that use damage clips and have
+ * CMA GEM objects backed by non-coherent memory. Calling this function
+ * in a plane's .atomic_update ensures that all the data in the backing
+ * memory have been written to RAM.
+ */
+void drm_fb_cma_sync_non_coherent(struct drm_device *drm,
+ struct drm_plane_state *old_state,
+ struct drm_plane_state *state)
+{
+ const struct drm_format_info *finfo = state->fb->format;
+ struct drm_atomic_helper_damage_iter iter;
+ const struct drm_gem_cma_object *cma_obj;
+ unsigned int offset, i;
+ struct drm_rect clip;
+ dma_addr_t daddr;
+ size_t nb_bytes;
+
+ for (i = 0; i < finfo->num_planes; i++) {
+ cma_obj = drm_fb_cma_get_gem_obj(state->fb, i);
+ if (!cma_obj->map_noncoherent)
+ continue;
+
+ daddr = drm_fb_cma_get_gem_addr(state->fb, state, i);
+ drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+
+ drm_atomic_for_each_plane_damage(&iter, &clip) {
+ /* Ignore x1/x2 values, invalidate complete lines */
+ offset = clip.y1 * state->fb->pitches[i];
+
+ nb_bytes = (clip.y2 - clip.y1) * state->fb->pitches[i];
+ dma_sync_single_for_device(drm->dev, daddr + offset,
+ nb_bytes, DMA_TO_DEVICE);
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(drm_fb_cma_sync_non_coherent);
diff --git a/include/drm/drm_fb_cma_helper.h b/include/drm/drm_fb_cma_helper.h
index 795aea1d0a25..3a177632b17e 100644
--- a/include/drm/drm_fb_cma_helper.h
+++ b/include/drm/drm_fb_cma_helper.h
@@ -14,5 +14,9 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
struct drm_plane_state *state,
unsigned int plane);
+void drm_fb_cma_sync_non_coherent(struct drm_device *drm,
+ struct drm_plane_state *old_state,
+ struct drm_plane_state *state);
+
#endif
--
2.30.2
