[PATCH libdrm 3/3] amdgpu: rework and remove amdgpu_get_auth()

[Emil Velikov]

On 22 January 2017 at 18:48, Emil Velikov <emil.l.velikov at gmail.com> wrote:
> All one needs is to establish if dev->fd is the flink (primary/card)
> node, rather than use DRM_IOCTL_GET_CLIENT to query the auth status.
>
> The latter is [somewhat] deprecated and incorrect. We need to know [and
> store] the primary node FD, since we're going to use it [at a later
> stage] for buffer import/export sharing.
>
> Cc: amd-gfx at lists.freedesktop.org
> Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
> ---
> Again not 100% sure but things look quite fishy as-is... The
> conditionals might be off.
>
> Note: original code [and this one] do not consider if flink_fd is
> already set, thus as we dup we'll leak it.
> ---
>  amdgpu/amdgpu_device.c | 43 ++-----------------------------------------
>  1 file changed, 2 insertions(+), 41 deletions(-)
>
> diff --git a/amdgpu/amdgpu_device.c b/amdgpu/amdgpu_device.c
> index f4ede031..6f04d936 100644
> --- a/amdgpu/amdgpu_device.c
> +++ b/amdgpu/amdgpu_device.c
> @@ -101,34 +101,6 @@ static int fd_compare(void *key1, void *key2)
>         return result;
>  }
>
> -/**
> -* Get the authenticated form fd,
> -*
> -* \param   fd   - \c [in]  File descriptor for AMD GPU device
> -* \param   auth - \c [out] Pointer to output the fd is authenticated or not
> -*                          A render node fd, output auth = 0
> -*                          A legacy fd, get the authenticated for compatibility root
> -*
> -* \return   0 on success\n
> -*          >0 - AMD specific error code\n
> -*          <0 - Negative POSIX Error code
> -*/
> -static int amdgpu_get_auth(int fd, int *auth)
> -{
> -       int r = 0;
> -       drm_client_t client = {};
> -
> -       if (drmGetNodeTypeFromFd(fd) == DRM_NODE_RENDER)
> -               *auth = 0;
> -       else {
> -               client.idx = 0;
> -               r = drmIoctl(fd, DRM_IOCTL_GET_CLIENT, &client);
> -               if (!r)
> -                       *auth = client.auth;
> -       }
> -       return r;
> -}
> -
>  static void amdgpu_device_free_internal(amdgpu_device_handle dev)
>  {
>         amdgpu_vamgr_deinit(dev->vamgr);
> @@ -175,8 +147,6 @@ int amdgpu_device_initialize(int fd,
>         struct amdgpu_device *dev;
>         drmVersionPtr version;
>         int r;
> -       int flag_auth = 0;
> -       int flag_authexist=0;
>         uint32_t accel_working = 0;
>         uint64_t start, max;
>
> @@ -185,19 +155,10 @@ int amdgpu_device_initialize(int fd,
>         pthread_mutex_lock(&fd_mutex);
>         if (!fd_tab)
>                 fd_tab = util_hash_table_create(fd_hash, fd_compare);
> -       r = amdgpu_get_auth(fd, &flag_auth);
> -       if (r) {
> -               pthread_mutex_unlock(&fd_mutex);
> -               return r;
> -       }
>         dev = util_hash_table_get(fd_tab, UINT_TO_PTR(fd));
>         if (dev) {
> -               r = amdgpu_get_auth(dev->fd, &flag_authexist);
> -               if (r) {
> -                       pthread_mutex_unlock(&fd_mutex);
> -                       return r;
> -               }
> -               if ((flag_auth) && (!flag_authexist)) {
> +               if (drmGetNodeTypeFromFd(fd) == DRM_NODE_RENDER &&
> +                   drmGetNodeTypeFromFd(dev->fd) == DRM_NODE_PRIMARY) {
>                         dev->flink_fd = dup(fd);
>                 }
>                 *major_version = dev->major_version;
> --

Seems like this and 1/3 has fallen through the cracks. Note that 2/3
is wrong, as pointed by Nicolai.
Can we get these moving in some shape or form - I have another ~20
patch series that builds on top ;-)

Thanks
Emil