diff options
Diffstat (limited to 'tools/include/uapi/drm/i915_drm.h')
| -rw-r--r-- | tools/include/uapi/drm/i915_drm.h | 21 |
1 files changed, 21 insertions, 0 deletions
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; |