Quoting Matthew Auld (2020-12-24 14:34:54)
> The shadow batch is an internal object, which doesn't have any page
> clearing, and since the batch_len can be smaller than the object, we
> should take care to clear it.
>
> Testcase: igt/gen9_exec_parse/shadow-peek
> Fixes: 4f7af1948abc ("drm/i915: Support ro ppgtt mapped cmdparser shadow
> buffers")
> Signed-off-by: Matthew Auld <matthew.a...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_cmd_parser.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c
> b/drivers/gpu/drm/i915/i915_cmd_parser.c
> index 8d88402387bd..ff3a0b8ccdd5 100644
> --- a/drivers/gpu/drm/i915/i915_cmd_parser.c
> +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
> @@ -1147,6 +1147,13 @@ static u32 *copy_batch(struct drm_i915_gem_object
> *dst_obj,
> if (IS_ERR(dst))
> return dst;
>
> + if (length < dst_obj->base.size) {
> + memset32(dst + length, 0,
> + (dst_obj->base.size - length) / sizeof(u32));
> + __i915_gem_object_flush_map(dst_obj, length,
> + dst_obj->base.size - length);
> + }
I feel like we might as well remove the shadow_needs_clflush() and just
do a i915_gem_object_flush_map(shadow->obj) after parsing.
Then for simple chronological ordering, we can place this at the end of
copy_batch
memset32(dst + length, 0, (dst_obj->base.size - length) / sizeof(u32));
The cost of one more function call along here? Unnoticable.
-Chris
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