diff mbox series

[v3,2/3] doc: update armv8-a IO barrier changes

Message ID 20200703185741.22184-2-honnappa.nagarahalli@arm.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers
Series [v3,1/3] eal: adjust barriers for IO on Armv8-a |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail apply issues

Commit Message

Honnappa Nagarahalli July 3, 2020, 6:57 p.m. UTC 
  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

Jerin Jacob July 5, 2020, 12:57 a.m. UTC | #1 
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
>
diff mbox series

Patch

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.**
+
+  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: