[PATCH] drm/amdgpu: Verify bo size can fit framebuffer size

[Mark Yacoub]

When creating a new framebuffer, verify that the bo size associated with
it can handle the fb size.
drm_gem_fb_init_with_funcs implements this check by calculating the
minimum expected size of each plane. amdgpu now uses this function to
initialize its fb as it performs the required checks.

The bug was caught using igt-gpu-tools test: kms_addfb_basic.too-high
and kms_addfb_basic.bo-too-small

Suggested-by: Sean Paul <seanpaul at chromium.org>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: amd-gfx at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Mark Yacoub <markyacoub at google.com>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 8 +++++---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c      | 3 ++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h    | 1 +
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 48cb33e5b3826..61684d543b8ef 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -872,13 +872,14 @@ static int amdgpu_display_get_fb_info(const struct amdgpu_framebuffer *amdgpu_fb

 int amdgpu_display_framebuffer_init(struct drm_device *dev,
 				    struct amdgpu_framebuffer *rfb,
+				    struct drm_file *file,
 				    const struct drm_mode_fb_cmd2 *mode_cmd,
 				    struct drm_gem_object *obj)
 {
 	int ret, i;
 	rfb->base.obj[0] = obj;
-	drm_helper_mode_fill_fb_struct(dev, &rfb->base, mode_cmd);
-	ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
+	ret = drm_gem_fb_init_with_funcs(dev, &rfb->base, file, mode_cmd,
+					 &amdgpu_fb_funcs);
 	if (ret)
 		goto fail;

@@ -953,7 +954,8 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev,
 		return ERR_PTR(-ENOMEM);
 	}

-	ret = amdgpu_display_framebuffer_init(dev, amdgpu_fb, mode_cmd, obj);
+	ret = amdgpu_display_framebuffer_init(dev, amdgpu_fb, file_priv,
+					      mode_cmd, obj);
 	if (ret) {
 		kfree(amdgpu_fb);
 		drm_gem_object_put(obj);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index 0bf7d36c6686d..2b9c9a621c437 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -233,7 +233,8 @@ static int amdgpufb_create(struct drm_fb_helper *helper,
 	}

 	ret = amdgpu_display_framebuffer_init(adev_to_drm(adev), &rfbdev->rfb,
-					      &mode_cmd, gobj);
+					      helper->client.file, &mode_cmd,
+					      gobj);
 	if (ret) {
 		DRM_ERROR("failed to initialize framebuffer %d\n", ret);
 		goto out;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
index 319cb19e1b99f..997b93674955e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
@@ -604,6 +604,7 @@ int amdgpu_display_get_crtc_scanoutpos(struct drm_device *dev,

 int amdgpu_display_framebuffer_init(struct drm_device *dev,
 				    struct amdgpu_framebuffer *rfb,
+				    struct drm_file *file,
 				    const struct drm_mode_fb_cmd2 *mode_cmd,
 				    struct drm_gem_object *obj);

--
2.30.1.766.gb4fecdf3b7-goog