Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
drm/fb_dma: Add generic get_scanout_buffer() for drm_panic
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
v12:
* Rename drm_panic_gem_get_scanout_buffer to drm_fb_dma_get_scanout_buffer
(Thomas Zimmermann)
* Remove the #ifdef CONFIG_DRM_PANIC, and build it unconditionnaly, as
it's a small function. (Thomas Zimmermann)
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240409163432.352518-6-jfalempe@redhat.com
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
+46
+42
drivers/gpu/drm/drm_fb_dma_helper.c
+42
drivers/gpu/drm/drm_fb_dma_helper.c
···
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#include <drm/drm_framebuffer.h>
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#include <drm/drm_gem_dma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_panic.h>
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#include <drm/drm_plane.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
···
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}
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}
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EXPORT_SYMBOL_GPL(drm_fb_dma_sync_non_coherent);
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/**
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* drm_fb_dma_get_scanout_buffer - Provide a scanout buffer in case of panic
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* @plane: DRM primary plane
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* @drm_scanout_buffer: scanout buffer for the panic handler
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* Returns: 0 or negative error code
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*
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* Generic get_scanout_buffer() implementation, for drivers that uses the
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* drm_fb_dma_helper. It won't call vmap in the panic context, so the driver
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* should make sure the primary plane is vmapped, otherwise the panic screen
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* won't get displayed.
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*/
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int drm_fb_dma_get_scanout_buffer(struct drm_plane *plane,
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struct drm_scanout_buffer *sb)
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{
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struct drm_gem_dma_object *dma_obj;
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struct drm_framebuffer *fb;
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fb = plane->state->fb;
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/* Only support linear modifier */
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if (fb->modifier != DRM_FORMAT_MOD_LINEAR)
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return -ENODEV;
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dma_obj = drm_fb_dma_get_gem_obj(fb, 0);
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/* Buffer should be accessible from the CPU */
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if (dma_obj->base.import_attach)
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return -ENODEV;
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/* Buffer should be already mapped to CPU */
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if (!dma_obj->vaddr)
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return -ENODEV;
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iosys_map_set_vaddr(&sb->map[0], dma_obj->vaddr);
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sb->format = fb->format;
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sb->height = fb->height;
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sb->width = fb->width;
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sb->pitch[0] = fb->pitches[0];
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return 0;
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}
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EXPORT_SYMBOL(drm_fb_dma_get_scanout_buffer);
+4
include/drm/drm_fb_dma_helper.h
+4
include/drm/drm_fb_dma_helper.h
···
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struct drm_device;
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struct drm_framebuffer;
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struct drm_plane_state;
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struct drm_scanout_buffer;
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struct drm_gem_dma_object *drm_fb_dma_get_gem_obj(struct drm_framebuffer *fb,
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unsigned int plane);
···
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void drm_fb_dma_sync_non_coherent(struct drm_device *drm,
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struct drm_plane_state *old_state,
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struct drm_plane_state *state);
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int drm_panic_gem_get_scanout_buffer(struct drm_plane *plane,
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struct drm_scanout_buffer *sb);
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#endif
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