[v3,2/3] doc: update armv8-a IO barrier changes
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Commit Message
Updated the use of DMB instruction in rte_*mb APIs for Armv8-a.
Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
doc/guides/rel_notes/release_20_08.rst | 7 +++++++
1 file changed, 7 insertions(+)
Comments
On Sat, Jul 4, 2020 at 12:28 AM Honnappa Nagarahalli
<honnappa.nagarahalli@arm.com> wrote:
>
> Updated the use of DMB instruction in rte_*mb APIs for Armv8-a.
>
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> ---
> doc/guides/rel_notes/release_20_08.rst | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/doc/guides/rel_notes/release_20_08.rst b/doc/guides/rel_notes/release_20_08.rst
> index 5cbc4ce14..15c21996d 100644
> --- a/doc/guides/rel_notes/release_20_08.rst
> +++ b/doc/guides/rel_notes/release_20_08.rst
> @@ -56,6 +56,13 @@ New Features
> Also, make sure to start the actual text at the margin.
> =========================================================
>
> +* **rte_*mb APIs are updated to use DMB instruction.**
IMO, It is better to change to following as the end user can ignore
parsing the description if not interested in arm64.
rte_*mb APIs are updated to use DMB instruction for Armv8-a
With above change:
Acked-by: Jerin Jacob <jerinj@marvell.com>
> +
> + Armv8-a memory model has been strengthened to require other-multi-copy
> + atomicity. This allows for using DMB instruction instead of DSB for IO
> + barriers. rte_*mb APIs, for Armv8-a platforms, are changed to use DMB
> + instruction to reflect this.
> +
> * **Updated PCAP driver.**
>
> Updated PCAP driver with new features and improvements, including:
> --
> 2.17.1
>
@@ -56,6 +56,13 @@ New Features
Also, make sure to start the actual text at the margin.
=========================================================
+* **rte_*mb APIs are updated to use DMB instruction.**
+
+ Armv8-a memory model has been strengthened to require other-multi-copy
+ atomicity. This allows for using DMB instruction instead of DSB for IO
+ barriers. rte_*mb APIs, for Armv8-a platforms, are changed to use DMB
+ instruction to reflect this.
+
* **Updated PCAP driver.**
Updated PCAP driver with new features and improvements, including: