Re: [FFmpeg-devel] [PATCH] lavu/hwcontext_vaapi: Skip 'vgem' driver

["Xiang, Haihao" <haihao.xiang-at-intel.com@ffmpeg.org>]

On Wed, 2022-11-23 at 13:54 -0800, Brian Norris wrote:
> There can be more than one available render node, and it's not
> guaranteed the first node we come across is the correct one. In
> particular, 'vgem' devices are common, and are
> never VAAPI-enabled and thus not valid here.
> 
> We have a 'kernel_driver' arg already for specifying a single driver we
> *do* want, but it doesn't support a negation, nor a list. It's easier
> just to automatically skip 'vgem' anyway, to avoid foisting this burden
> on users.
> 
> This has precedent in libva-utils already:
> 
>   bfb6b98ed62a exclude vgem node and invalid drm node in vainfo
>   
> https://github.com/intel/libva-utils/commit/bfb6b98ed62ac14a840ba62639ab902a23912258
> 
> Signed-off-by: Brian Norris <briannorris@chromium.org>
> ---
> 
>  libavutil/hwcontext_vaapi.c | 28 +++++++++++++++++++++-------
>  1 file changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/libavutil/hwcontext_vaapi.c b/libavutil/hwcontext_vaapi.c
> index 4bcde74f6212..84b03b633251 100644
> --- a/libavutil/hwcontext_vaapi.c
> +++ b/libavutil/hwcontext_vaapi.c
> @@ -1700,6 +1700,7 @@ static int vaapi_device_create(AVHWDeviceContext *ctx,
> const char *device,
>              char path[64];
>              int n, max_devices = 8;
>  #if CONFIG_LIBDRM
> +            drmVersion *info;
>              const AVDictionaryEntry *kernel_driver;
>              kernel_driver = av_dict_get(opts, "kernel_driver", NULL, 0);
>  #endif
> @@ -1713,9 +1714,15 @@ static int vaapi_device_create(AVHWDeviceContext *ctx,
> const char *device,
>                      break;
>                  }
>  #if CONFIG_LIBDRM
> +                info = drmGetVersion(priv->drm_fd);
> +                if (!info) {
> +                    av_log(ctx, AV_LOG_VERBOSE,
> +                           "Failed to get DRM version for device %d.\n", n);
> +                    close(priv->drm_fd);
> +                    priv->drm_fd = -1;
> +                    continue;
> +                }
>                  if (kernel_driver) {
> -                    drmVersion *info;
> -                    info = drmGetVersion(priv->drm_fd);
>                      if (strcmp(kernel_driver->value, info->name)) {
>                          av_log(ctx, AV_LOG_VERBOSE, "Ignoring device %d "
>                                 "with non-matching kernel driver (%s).\n",
> @@ -1730,12 +1737,19 @@ static int vaapi_device_create(AVHWDeviceContext *ctx,
> const char *device,
>                             "with matching kernel driver (%s).\n",
>                             n, info->name);
>                      drmFreeVersion(info);
> -                } else
> -#endif
> -                {
> -                    av_log(ctx, AV_LOG_VERBOSE, "Trying to use "
> -                           "DRM render node for device %d.\n", n);
> +                    break;
> +                } else if (!strncmp(info->name, "vgem", 4)) {

The virtual GEM device is vgem, so better to use strcmp here. 

Thanks
Haihao

> +                    av_log(ctx, AV_LOG_VERBOSE,
> +                           "Skipping vgem node for device %d.\n", n);
> +                    drmFreeVersion(info);
> +                    close(priv->drm_fd);
> +                    priv->drm_fd = -1;
> +                    continue;
>                  }
> +                drmFreeVersion(info);
> +#endif
> +                av_log(ctx, AV_LOG_VERBOSE, "Trying to use "
> +                       "DRM render node for device %d.\n", n);
>                  break;
>              }
>              if (n >= max_devices)
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