From: Hsin-Yi Wang <hsinyi@chromium.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Rob Herring <robh+dt@kernel.org>,
Maxime Ripard <maxime@cerno.tech>,
- <devicetree-spec@vger.kernel.org>,
devicetree@vger.kernel.org,
Matthias Brugger <matthias.bgg@gmail.com>,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, senozhatsky@chromium.org,
tfiga@chromium.org
Subject: [PATCH 2/3] dt-bindings: Add io-tlb-segsize property for restricted-dma-pool
Date: Tue, 23 Nov 2021 19:21:03 +0800 [thread overview]
Message-ID: <20211123112104.3530135-3-hsinyi@chromium.org> (raw)
In-Reply-To: <20211123112104.3530135-1-hsinyi@chromium.org>
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@chromium.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
next prev parent reply other threads:[~2021-11-23 11:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-23 11:21 [PATCH 0/3] Allow restricted-dma-pool to customize IO_TLB_SEGSIZE Hsin-Yi Wang
2021-11-23 11:21 ` [PATCH 1/3] dma: swiotlb: " Hsin-Yi Wang
2021-11-23 11:21 ` Hsin-Yi Wang [this message]
2021-11-23 16:34 ` [PATCH 2/3] dt-bindings: Add io-tlb-segsize property for restricted-dma-pool Rob Herring
2021-11-23 11:21 ` [PATCH 3/3] arm64: dts: mt8183: use restricted swiotlb for scp mem Hsin-Yi Wang
2021-11-23 11:58 ` [PATCH 0/3] Allow restricted-dma-pool to customize IO_TLB_SEGSIZE Robin Murphy
2021-11-24 3:55 ` Hsin-Yi Wang
2021-11-24 12:34 ` Robin Murphy
2021-11-25 7:35 ` Tomasz Figa
2021-12-03 13:07 ` Robin Murphy
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