On 09/04/2024 10:21, Thomas Zimmermann wrote:
Hi
Am 28.03.24 um 13:03 schrieb Jocelyn Falempe:
This was initialy done for imx6, but should work on most drivers
using drm_fb_dma_helper.
v8:
* Replace get_scanout_buffer() logic with drm_panic_set_buffer()
(Thomas Zimmermann)
v9:
* go back to get_scanout_buffer()
* move get_scanout_buffer() to plane helper functions
Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
---
drivers/gpu/drm/drm_fb_dma_helper.c | 47 +++++++++++++++++++++++++++++
include/drm/drm_fb_dma_helper.h | 4 +++
2 files changed, 51 insertions(+)
diff --git a/drivers/gpu/drm/drm_fb_dma_helper.c
b/drivers/gpu/drm/drm_fb_dma_helper.c
index 3b535ad1b07c..010327069ad4 100644
--- a/drivers/gpu/drm/drm_fb_dma_helper.c
+++ b/drivers/gpu/drm/drm_fb_dma_helper.c
@@ -15,6 +15,7 @@
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_panic.h>
#include <drm/drm_plane.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
@@ -148,3 +149,49 @@ void drm_fb_dma_sync_non_coherent(struct
drm_device *drm,
}
}
EXPORT_SYMBOL_GPL(drm_fb_dma_sync_non_coherent);
+
+#if defined(CONFIG_DRM_PANIC)
I would not bother with CONFIG_DRM_PANIC for now and make the helper
generally available.
yes, that's a small function, let's keep it simple.
Done in v12
+/**
+ * @plane: DRM primary plane
+ * @drm_scanout_buffer: scanout buffer for the panic handler
+ * Returns: 0 or negative error code
+ *
+ * Generic get_scanout_buffer() implementation, for drivers that uses
the
+ * drm_fb_dma_helper.
+ */
+int drm_panic_gem_get_scanout_buffer(struct drm_plane *plane,
+ struct drm_scanout_buffer *sb)
It's neither really a function for panic handling nor a GEM function.
This helper needs to be called drm_fb_dma_get_scanout_buffer() IMHO.
I agree, it matches the other functions prefixes in this file.
Done in v12
+{
+ struct drm_gem_dma_object *dma_obj;
+ struct drm_framebuffer *fb;
+
+ fb = plane->state->fb;
+ /* Only support linear modifier */
+ if (fb->modifier != DRM_FORMAT_MOD_LINEAR)
+ return -ENODEV;
+
+ dma_obj = drm_fb_dma_get_gem_obj(fb, 0);
+
+ /* Buffer should be accessible from the CPU */
+ if (dma_obj->base.import_attach)
+ return -ENODEV;
+
+ /* Buffer should be already mapped to CPU */
+ if (!dma_obj->vaddr)
+ return -ENODEV;
+
+ iosys_map_set_vaddr(&sb->map, dma_obj->vaddr);
+ sb->format = fb->format;
+ sb->height = fb->height;
+ sb->width = fb->width;
+ sb->pitch = fb->pitches[0];
+ return 0;
+}
+#else
+int drm_panic_gem_get_scanout_buffer(struct drm_plane *plane,
+ struct drm_scanout_buffer *sb)
+{
+ return -ENODEV;
+}
+#endif
+EXPORT_SYMBOL(drm_panic_gem_get_scanout_buffer);
diff --git a/include/drm/drm_fb_dma_helper.h
b/include/drm/drm_fb_dma_helper.h
index d5e036c57801..61f24c2aba2f 100644
--- a/include/drm/drm_fb_dma_helper.h
+++ b/include/drm/drm_fb_dma_helper.h
@@ -7,6 +7,7 @@
struct drm_device;
struct drm_framebuffer;
struct drm_plane_state;
+struct drm_scanout_buffer;
struct drm_gem_dma_object *drm_fb_dma_get_gem_obj(struct
drm_framebuffer *fb,
unsigned int plane);
@@ -19,5 +20,8 @@ void drm_fb_dma_sync_non_coherent(struct drm_device
*drm,
struct drm_plane_state *old_state,
struct drm_plane_state *state);
+int drm_panic_gem_get_scanout_buffer(struct drm_plane *plane,
+ struct drm_scanout_buffer *sb);
+
#endif
Thanks for the reviews,
--
Jocelyn
