[RFC] Host1x/TegraDRM UAPI

[Dmitry Osipenko]

23.06.2020 15:09, Mikko Perttunen пишет:
> struct drm_tegra_submit_relocation {
>         /* [in] Index of GATHER or GATHER_UPTR command in commands. */
>         __u32 gather_command_index;
> 
>         /*
>          * [in] Mapping handle (obtained through CHANNEL_MAP) of the memory
>          *   the address of which will be patched in.
>          */
>         __u32 mapping_id;
> 
>         /*
>          * [in] Offset in the gather that will be patched.
>          */
>         __u64 gather_offset;
> 
>         /*
>          * [in] Offset in target buffer whose paddr/IOVA will be written
>          *   to the gather.
>          */
>         __u64 target_offset;
> 
>         /*
>          * [in] Number of bits the resulting address will be logically
>          *   shifted right before writing to gather.
>          */
>         __u32 shift;
> 
>         __u32 reserved[1];
> };

We will also need read/write direction flag here for the
DMA-reservations set up, it will be used for the implicit BO fencing by
the job's scheduler.