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Danilo Krummrich
d59e75eef5
Report the maximum number of IBs that can be pushed with a single DRM_IOCTL_NOUVEAU_EXEC through DRM_IOCTL_NOUVEAU_GETPARAM. While the maximum number of IBs per ring might vary between chipsets, the kernel will make sure that userspace can only push a fraction of the maximum number of IBs per ring per job, such that we avoid a situation where there's only a single job occupying the ring, which could potentially lead to the ring run dry. Using DRM_IOCTL_NOUVEAU_GETPARAM to report the maximum number of IBs that can be pushed with a single DRM_IOCTL_NOUVEAU_EXEC implies that all channels of a given device have the same ring size. Reviewed-by: Dave Airlie <[email protected]> Reviewed-by: Lyude Paul <[email protected]> Acked-by: Faith Ekstrand <[email protected]> Signed-off-by: Danilo Krummrich <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]