drm/amdgpu: Verify bo size can fit framebuffer size on init.

To initialize the framebuffer, call drm_gem_fb_init_with_funcs which
verifies that the BO size can fit the FB size by calculating the minimum
expected size of each plane.

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

Tested on ChromeOS Zork by turning on the display and running a YT
video.

=== Changes from v1 ===
1. Added new line under declarations.
2. Use C style comment.

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Mark Yacoub <markyacoub@chromium.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 48cb33e..afa5f8a 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -870,17 +870,62 @@ static int amdgpu_display_get_fb_info(const struct amdgpu_framebuffer *amdgpu_fb
        return r;
 }
 
+int amdgpu_display_gem_fb_init(struct drm_device *dev,
+                              struct amdgpu_framebuffer *rfb,
+                              const struct drm_mode_fb_cmd2 *mode_cmd,
+                              struct drm_gem_object *obj)
+{
+       int ret;
+
+       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);
+       if (ret)
+               goto err;
+
+       ret = amdgpu_display_framebuffer_init(dev, rfb, mode_cmd, obj);
+       if (ret)
+               goto err;
+
+       return 0;
+err:
+       drm_err(dev, "Failed to init gem fb: %d\n", ret);
+       rfb->base.obj[0] = NULL;
+       return ret;
+}
+
+int amdgpu_display_gem_fb_verify_and_init(
+       struct drm_device *dev, struct amdgpu_framebuffer *rfb,
+       struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
+       struct drm_gem_object *obj)
+{
+       int ret;
+
+       rfb->base.obj[0] = obj;
+
+       /* Verify that bo size can fit the fb size. */
+       ret = drm_gem_fb_init_with_funcs(dev, &rfb->base, file_priv, mode_cmd,
+                                        &amdgpu_fb_funcs);
+       if (ret)
+               goto err;
+
+       ret = amdgpu_display_framebuffer_init(dev, rfb, mode_cmd, obj);
+       if (ret)
+               goto err;
+
+       return 0;
+err:
+       drm_err(dev, "Failed to verify and init gem fb: %d\n", ret);
+       rfb->base.obj[0] = NULL;
+       return ret;
+}
+
 int amdgpu_display_framebuffer_init(struct drm_device *dev,
                                    struct amdgpu_framebuffer *rfb,
                                    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);
-       if (ret)
-               goto fail;
 
        /*
         * This needs to happen before modifier conversion as that might change
@@ -891,13 +936,13 @@ int amdgpu_display_framebuffer_init(struct drm_device *dev,
                        drm_dbg_kms(dev, "Plane 0 and %d have different BOs: %u vs. %u\n",
                                    i, mode_cmd->handles[0], mode_cmd->handles[i]);
                        ret = -EINVAL;
-                       goto fail;
+                       return ret;
                }
        }
 
        ret = amdgpu_display_get_fb_info(rfb, &rfb->tiling_flags, &rfb->tmz_surface);
        if (ret)
-               goto fail;
+               return ret;
 
        if (dev->mode_config.allow_fb_modifiers &&
            !(rfb->base.flags & DRM_MODE_FB_MODIFIERS)) {
@@ -905,7 +950,7 @@ int amdgpu_display_framebuffer_init(struct drm_device *dev,
                if (ret) {
                        drm_dbg_kms(dev, "Failed to convert tiling flags 0x%llX to a modifier",
                                    rfb->tiling_flags);
-                       goto fail;
+                       return ret;
                }
        }
 
@@ -915,10 +960,6 @@ int amdgpu_display_framebuffer_init(struct drm_device *dev,
        }
 
        return 0;
-
-fail:
-       rfb->base.obj[0] = NULL;
-       return ret;
 }
 
 struct drm_framebuffer *
@@ -953,7 +994,8 @@ 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_gem_fb_verify_and_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 51cd49c..8d9c532 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -232,8 +232,8 @@ static int amdgpufb_create(struct drm_fb_helper *helper,
                goto out;
        }
 
-       ret = amdgpu_display_framebuffer_init(adev_to_drm(adev), &rfbdev->rfb,
-                                             &mode_cmd, gobj);
+       ret = amdgpu_display_gem_fb_init(adev_to_drm(adev), &rfbdev->rfb,
+                                        &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 319cb19..cb0b581 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h
@@ -602,6 +602,14 @@ int amdgpu_display_get_crtc_scanoutpos(struct drm_device *dev,
                        int *hpos, ktime_t *stime, ktime_t *etime,
                        const struct drm_display_mode *mode);
 
+int amdgpu_display_gem_fb_init(struct drm_device *dev,
+                              struct amdgpu_framebuffer *rfb,
+                              const struct drm_mode_fb_cmd2 *mode_cmd,
+                              struct drm_gem_object *obj);
+int amdgpu_display_gem_fb_verify_and_init(
+       struct drm_device *dev, struct amdgpu_framebuffer *rfb,
+       struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
+       struct drm_gem_object *obj);
 int amdgpu_display_framebuffer_init(struct drm_device *dev,
                                    struct amdgpu_framebuffer *rfb,
                                    const struct drm_mode_fb_cmd2 *mode_cmd,