Re: [igt-dev] [PATCH i-g-t 2/5] lib/igt_fb: Call dumb_destroy ioctl in case of dumb buffers

[Chris Wilson <chris@chris-wilson.co.uk>]

Quoting Deepak Rawat (2018-09-06 01:03:47)
> vmwgfx does not support GEM interface so calling gem_close on vmwgfx
> results in error. Call dumb destroy IOCTL in case have dumb buffer.
> 
> Signed-off-by: Deepak Rawat <drawat@vmware.com>
> ---
>  lib/igt_fb.c  |  5 ++++-
>  lib/igt_kms.c | 15 +++++++++++++++
>  lib/igt_kms.h |  1 +
>  3 files changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/igt_fb.c b/lib/igt_fb.c
> index ae71d967..ba995a1a 100644
> --- a/lib/igt_fb.c
> +++ b/lib/igt_fb.c
> @@ -1920,7 +1920,10 @@ void igt_remove_fb(int fd, struct igt_fb *fb)
>  
>         cairo_surface_destroy(fb->cairo_surface);
>         do_or_die(drmModeRmFB(fd, fb->fb_id));
> -       gem_close(fd, fb->gem_handle);
> +       if (fb->is_dumb)
> +               kmstest_dumb_destroy(fd, fb->gem_handle);
> +       else
> +               gem_close(fd, fb->gem_handle);
>         fb->fb_id = 0;
>  }
>  
> diff --git a/lib/igt_kms.c b/lib/igt_kms.c
> index 62d84684..9e9414cf 100644
> --- a/lib/igt_kms.c
> +++ b/lib/igt_kms.c
> @@ -639,6 +639,21 @@ void *kmstest_dumb_map_buffer(int fd, uint32_t handle, uint64_t size,
>         return ptr;
>  }
>  
> +/**
> + * kmstest_dumb_destroy:
> + * @fd: Opened drm file descriptor
> + * @handle: Offset in the file referred to by fd
> + */
> +void kmstest_dumb_destroy(int fd, uint32_t handle)
> +{
> +       struct drm_mode_destroy_dumb arg = {};
> +
> +       igt_assert_neq(handle, 0);

Don't bother doing the kernel's job for it. Abusing the ioctl iface is
the name of the game.

> +       arg.handle = handle;
> +       do_ioctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &arg);

struct drm_mode_destroy_dumb arg = { handle };

Try never to use do_ioctl() if you ever want to debug an error.
-Chris
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