Matt Roper <matthew.d.roper@xxxxxxxxx> writes:
> On gen11 the XY_FAST_COPY_BLT command has some size restrictions on its
> usage. Although this instruction is mainly used by userspace, i915 also
> uses it to copy object contents during some selftests, so let's ensure
> the restrictions are followed.
>
> Bspec: 6544
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_object_blt.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
> index 39b8a055d80a..e00792158f13 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
> @@ -196,6 +196,17 @@ int i915_gem_object_fill_blt(struct drm_i915_gem_object *obj,
> return err;
> }
>
> +/* Wa_1209644611:icl,ehl */
> +static bool wa_1209644611_applies(struct drm_i915_private *i915, u32 size)
> +{
> + u32 height = size >> PAGE_SHIFT;
> +
> + if (!IS_GEN(i915, 11))
> + return false;
> +
> + return height % 4 == 3 && height <= 8;
The workaround description matches with this. However the original
sighting was only for Y-Tiled surfaces. I asked for clarification.
If we won't get one, we can play it safe and use this as it is.
-Mika
> +}
> +
> struct i915_vma *intel_emit_vma_copy_blt(struct intel_context *ce,
> struct i915_vma *src,
> struct i915_vma *dst)
> @@ -237,7 +248,8 @@ struct i915_vma *intel_emit_vma_copy_blt(struct intel_context *ce,
> size = min_t(u64, rem, block_size);
> GEM_BUG_ON(size >> PAGE_SHIFT > S16_MAX);
>
> - if (INTEL_GEN(i915) >= 9) {
> + if (INTEL_GEN(i915) >= 9 &&
> + !wa_1209644611_applies(i915, size)) {
> *cmd++ = GEN9_XY_FAST_COPY_BLT_CMD | (10 - 2);
> *cmd++ = BLT_DEPTH_32 | PAGE_SIZE;
> *cmd++ = 0;
> --
> 2.24.1
>
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