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drm/vkms: Let shadow-plane helpers prepare the plane's FB 

Replace vkms' prepare_fb and cleanup_fb functions with the generic
code for shadow-buffered planes. No functional changes.

This change also fixes a problem where IGT kms_flip tests would
create a segmentation fault within vkms. The driver's prepare_fb
function did not report an error if a BO's vmap operation failed.
The kernel later tried to operate on the non-mapped memory areas.
The shared shadow-plane helpers handle errors correctly, so that
the driver now avoids the segmantation fault.

v2:
	* include paragraph about IGT tests in commit message (Melissa)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210705074633.9425-4-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2021-07-05 09:46:32 +02:00
parent 7602d42218
commit b43e2ec03b
1 changed files with 1 additions and 37 deletions
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38
drivers/gpu/drm/vkms/vkms_plane.c
View File

@ -8,7 +8,6 @@
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include "vkms_drv.h"
@ -150,45 +149,10 @@ static int vkms_plane_atomic_check(struct drm_plane *plane,
return 0;
}
static int vkms_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *state)
{
struct drm_gem_object *gem_obj;
struct dma_buf_map map;
int ret;
if (!state->fb)
return 0;
gem_obj = drm_gem_fb_get_obj(state->fb, 0);
ret = drm_gem_shmem_vmap(gem_obj, &map);
if (ret)
DRM_ERROR("vmap failed: %d\n", ret);
return drm_gem_plane_helper_prepare_fb(plane, state);
}
static void vkms_cleanup_fb(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
struct drm_gem_object *gem_obj;
struct drm_gem_shmem_object *shmem_obj;
struct dma_buf_map map;
if (!old_state->fb)
return;
gem_obj = drm_gem_fb_get_obj(old_state->fb, 0);
shmem_obj = to_drm_gem_shmem_obj(drm_gem_fb_get_obj(old_state->fb, 0));
dma_buf_map_set_vaddr(&map, shmem_obj->vaddr);
drm_gem_shmem_vunmap(gem_obj, &map);
}
static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
.atomic_update = vkms_plane_atomic_update,
.atomic_check = vkms_plane_atomic_check,
.prepare_fb = vkms_prepare_fb,
.cleanup_fb = vkms_cleanup_fb,
DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
};
struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,