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    Subject[PATCH 12/15] tools headers UAPI: Sync drm/i915_drm.h with the kernel sources
    Date
    From: Arnaldo Carvalho de Melo <acme@redhat.com>

    To pick the change in:

    88be76cdafc7 ("drm/i915: Allow userspace to specify ringsize on construction")

    That don't result in any changes in tooling, just silences this perf
    build warning:

    Warning: Kernel ABI header at 'tools/include/uapi/drm/i915_drm.h' differs from latest version at 'include/uapi/drm/i915_drm.h'
    diff -u tools/include/uapi/drm/i915_drm.h include/uapi/drm/i915_drm.h

    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/include/uapi/drm/i915_drm.h | 21 +++++++++++++++++++++
    1 file changed, 21 insertions(+)

    diff --git a/tools/include/uapi/drm/i915_drm.h b/tools/include/uapi/drm/i915_drm.h
    index 829c0a48577f..2813e579b480 100644
    --- a/tools/include/uapi/drm/i915_drm.h
    +++ b/tools/include/uapi/drm/i915_drm.h
    @@ -1619,6 +1619,27 @@ struct drm_i915_gem_context_param {
    * By default, new contexts allow persistence.
    */
    #define I915_CONTEXT_PARAM_PERSISTENCE 0xb
    +
    +/*
    + * I915_CONTEXT_PARAM_RINGSIZE:
    + *
    + * Sets the size of the CS ringbuffer to use for logical ring contexts. This
    + * applies a limit of how many batches can be queued to HW before the caller
    + * is blocked due to lack of space for more commands.
    + *
    + * Only reliably possible to be set prior to first use, i.e. during
    + * construction. At any later point, the current execution must be flushed as
    + * the ring can only be changed while the context is idle. Note, the ringsize
    + * can be specified as a constructor property, see
    + * I915_CONTEXT_CREATE_EXT_SETPARAM, but can also be set later if required.
    + *
    + * Only applies to the current set of engine and lost when those engines
    + * are replaced by a new mapping (see I915_CONTEXT_PARAM_ENGINES).
    + *
    + * Must be between 4 - 512 KiB, in intervals of page size [4 KiB].
    + * Default is 16 KiB.
    + */
    +#define I915_CONTEXT_PARAM_RINGSIZE 0xc
    /* Must be kept compact -- no holes and well documented */

    __u64 value;
    --
    2.21.1
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