Re: [PATCH v2] drm/amdgpu: Verify bo size can fit framebuffer size on init.

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On Mon, Mar 8, 2021 at 4:36 PM Mark Yacoub <markyacoub@xxxxxxxxxxxx> wrote:
>
> From: Mark Yacoub <markyacoub@xxxxxxxxxx>
>
> 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@xxxxxxx>
> Cc: "Christian König" <christian.koenig@xxxxxxx>
> Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Signed-off-by: Mark Yacoub <markyacoub@xxxxxxxxxxxx>

Applied.  Thanks.  FWIW, it would be nice to clean this up in general.
All of this fbdev stuff is pretty convoluted.

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 68 +++++++++++++++++----
>  drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c      |  4 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h    |  8 +++
>  3 files changed, 65 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> index 48cb33e5b3826..afa5f8ad0f563 100644
> --- 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 0bf7d36c6686d..22157bd7017c9 100644
> --- 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 319cb19e1b99f..cb0b581bbce7b 100644
> --- 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,
> --
> 2.30.1.766.gb4fecdf3b7-goog
>
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