linux-kernel - [PATCH 2/3] dt-bindings: Add io-tlb-segsize property for restricted-dma-pool

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Message-Id: <20211123112104.3530135-3-hsinyi@chromium.org>
Date:   Tue, 23 Nov 2021 19:21:03 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <maxime@...no.tech>,
        - <devicetree-spec@...r.kernel.org>, devicetree@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, senozhatsky@...omium.org,
        tfiga@...omium.org
Subject: [PATCH 2/3] dt-bindings: Add io-tlb-segsize property for restricted-dma-pool

Add a io-tlb-segsize property that each restricted-dma-pool can set its
own io_tlb_segsize since some use cases require slabs larger than default
value (128).

Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
 .../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 a4bf757d6881de..6198bf6b76f0b2 100644
--- a/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml
+++ b/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml
@@ -56,6 +56,14 @@ properties:
       If this property is present, then Linux will use the region for
       the default pool of the consistent DMA allocator.
 
+  io-tlb-segsize:
+    type: u32
+    description: >
+      Each restricted-dma-pool can use this property to set its own
+      io_tlb_segsize. If not set, it will use the default value
+      IO_TLB_SEGSIZE defined in include/linux/swiotlb.h. The value has
+      to be a power of 2, otherwise it will fall back to IO_TLB_SEGSIZE.
+
 unevaluatedProperties: false
 
 examples:
-- 
2.34.0.rc2.393.gf8c9666880-goog