[Intel-gfx] [RFC PATCH 5/5] drm/i915: Update execbuf IOCTL to accept N BBs

[Daniel Vetter]

On Thu, May 06, 2021 at 10:30:49AM -0700, Matthew Brost wrote:
> Add I915_EXEC_NUMBER_BB_* to drm_i915_gem_execbuffer2.flags which allows
> submitting N BBs per IOCTL.
> 
> Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Cc: Tony Ye <tony.ye at intel.com>
> CC: Carl Zhang <carl.zhang at intel.com>
> Cc: Daniel Vetter <daniel.vetter at intel.com>
> Cc: Jason Ekstrand <jason at jlekstrand.net>
> Signed-off-by: Matthew Brost <matthew.brost at intel.com>

I dropped my big question on the previous patch already, I'll check this
out again when it's all squashed into the parallel extension patch so we
have everything in one commit.
-Daniel

> ---
>  include/uapi/drm/i915_drm.h | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 0175b12b33b8..d3072cad4a7e 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1291,7 +1291,26 @@ struct drm_i915_gem_execbuffer2 {
>   */
>  #define I915_EXEC_USE_EXTENSIONS	(1 << 21)
>  
> -#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_USE_EXTENSIONS << 1))
> +/*
> + * Number of BB in execbuf2 IOCTL - 1, used to submit more than BB in a single
> + * execbuf2 IOCTL.
> + *
> + * Return -EINVAL if more than 1 BB (value 0) is specified if
> + * I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT hasn't been called on the gem
> + * context first. Also returns -EINVAL if gem context has been setup with
> + * I915_PARALLEL_NO_PREEMPT_MID_BATCH and the number BBs not equal to the total
> + * number hardware contexts in the gem context.
> + */
> +#define I915_EXEC_NUMBER_BB_LSB		(22)
> +#define I915_EXEC_NUMBER_BB_MASK	(0x3f << I915_EXEC_NUMBER_BB_LSB)
> +#define I915_EXEC_NUMBER_BB_MSB		(27)
> +#define i915_execbuffer2_set_number_bb(eb2, num_bb) \
> +	(eb2).flags = ((eb2).flags & ~I915_EXEC_NUMBER_BB_MASK) | \
> +	(((num_bb - 1) << I915_EXEC_NUMBER_BB_LSB) & I915_EXEC_NUMBER_BB_MASK)
> +#define i915_execbuffer2_get_number_bb(eb2) \
> +	((((eb2).flags & I915_EXEC_NUMBER_BB_MASK) >> I915_EXEC_NUMBER_BB_LSB) + 1)
> +
> +#define __I915_EXEC_UNKNOWN_FLAGS (-(1 << (I915_EXEC_NUMBER_BB_MSB + 1)))
>  
>  #define I915_EXEC_CONTEXT_ID_MASK	(0xffffffff)
>  #define i915_execbuffer2_set_context_id(eb2, context) \
> -- 
> 2.28.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch