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Subject[PATCH v3 2/3] drm: Add and export function drm_gem_cma_sync_data
Date
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

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
drivers/gpu/drm/drm_gem_cma_helper.c | 55 ++++++++++++++++++++++++++++
include/drm/drm_gem_cma_helper.h | 5 +++
2 files changed, 60 insertions(+)

diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index 81a31bcf7d68..9dbe766c3177 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -17,9 +17,14 @@
#include <linux/slab.h>

#include <drm/drm.h>
+#include <drm/drm_damage_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_plane.h>
#include <drm/drm_vma_manager.h>

/**
@@ -589,3 +594,53 @@ int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
return drm_gem_prime_mmap(obj, vma);
}
EXPORT_SYMBOL(drm_gem_cma_prime_mmap);
+
+/**
+ * drm_gem_cma_sync_data - 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_gem_cma_sync_data(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;
+
+ for (i = 0; i < finfo->num_planes; i++) {
+ cma_obj = drm_fb_cma_get_gem_obj(state->fb, i);
+
+ if (cma_obj->map_noncoherent)
+ break;
+ }
+
+ /* No non-coherent buffers - no need to sync anything. */
+ if (i == finfo->num_planes)
+ return;
+
+ drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+
+ drm_atomic_for_each_plane_damage(&iter, &clip) {
+ for (i = 0; i < finfo->num_planes; i++) {
+ daddr = drm_fb_cma_get_gem_addr(state->fb, state, i);
+
+ /* Ignore x1/x2 values, invalidate complete lines */
+ offset = clip.y1 * state->fb->pitches[i];
+
+ dma_sync_single_for_device(drm->dev, daddr + offset,
+ (clip.y2 - clip.y1) * state->fb->pitches[i],
+ DMA_TO_DEVICE);
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_sync_data);
diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h
index b597e00fd5f6..4ccc8c69e594 100644
--- a/include/drm/drm_gem_cma_helper.h
+++ b/include/drm/drm_gem_cma_helper.h
@@ -7,6 +7,7 @@
#include <drm/drm_gem.h>

struct drm_mode_create_dumb;
+struct drm_plane_state;

/**
* struct drm_gem_cma_object - GEM object backed by CMA memory allocations
@@ -187,4 +188,8 @@ drm_gem_cma_prime_import_sg_table_vmap(struct drm_device *drm,
int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma);

+void drm_gem_cma_sync_data(struct drm_device *drm,
+ struct drm_plane_state *old_state,
+ struct drm_plane_state *state);
+
#endif /* __DRM_GEM_CMA_HELPER_H__ */
--
2.30.2
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