linux-kernel - [PATCH 19/21] dt-bindings: reserved-memory: shared-dma-pool: support DMB

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Message-Id: <20220913195508.3511038-20-opendmb@gmail.com>
Date:   Tue, 13 Sep 2022 12:55:06 -0700
From:   Doug Berger <opendmb@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jonathan Corbet <corbet@....net>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Mike Rapoport <rppt@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Borislav Petkov <bp@...e.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
        Oscar Salvador <osalvador@...e.de>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        - <devicetree-spec@...r.kernel.org>,
        KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
        Mel Gorman <mgorman@...e.de>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mm@...ck.org, iommu@...ts.linux.dev
Subject: [PATCH 19/21] dt-bindings: reserved-memory: shared-dma-pool: support DMB

The shared-dmb-pool compatible string creates a Designated Movable
Block to contain a shared pool of DMA buffers.

Signed-off-by: Doug Berger <opendmb@...il.com>
---
 .../bindings/reserved-memory/shared-dma-pool.yaml         | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml b/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml
index 618105f079be..85824fe05ac9 100644
--- a/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml
+++ b/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml
@@ -22,6 +22,14 @@ properties:
           operating system to instantiate the necessary pool management
           subsystem if necessary.
 
+      - const: shared-dmb-pool
+        description: >
+          This indicates a shared-dma-pool region that is located within
+          a Designated Movable Block. The operating system is free to
+          use unallocated memory for movable allocations in this region.
+          Devices need to be tolerant of allocation latency to use this
+          pool.
+
       - const: restricted-dma-pool
         description: >
           This indicates a region of memory meant to be used as a pool
-- 
2.25.1