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 0/3] Allow restricted-dma-pool to customize IO_TLB_SEGSIZE
Date: Tue, 23 Nov 2021 19:21:01 +0800 [thread overview]
Message-ID: <20211123112104.3530135-1-hsinyi@chromium.org> (raw)
Default IO_TLB_SEGSIZE (128) slabs may be not enough for some use cases.
This series adds support to customize io_tlb_segsize for each
restricted-dma-pool.
Example use case:
mtk-isp drivers[1] are controlled by mtk-scp[2] and allocate memory through
mtk-scp. In order to use the noncontiguous DMA API[3], we need to use
the swiotlb pool. mtk-scp needs to allocate memory with 2560 slabs.
mtk-isp drivers also needs to allocate memory with 200+ slabs. Both are
larger than the default IO_TLB_SEGSIZE (128) slabs.
[1] (not in upstream) https://patchwork.kernel.org/project/linux-media/cover/20190611035344.29814-1-jungo.lin@mediatek.com/
[2] https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/mtk_scp.c
[3] https://patchwork.kernel.org/project/linux-media/cover/20210909112430.61243-1-senozhatsky@chromium.org/
Hsin-Yi Wang (3):
dma: swiotlb: Allow restricted-dma-pool to customize IO_TLB_SEGSIZE
dt-bindings: Add io-tlb-segsize property for restricted-dma-pool
arm64: dts: mt8183: use restricted swiotlb for scp mem
.../reserved-memory/shared-dma-pool.yaml | 8 +++++
.../arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 4 +--
include/linux/swiotlb.h | 1 +
kernel/dma/swiotlb.c | 34 ++++++++++++++-----
4 files changed, 37 insertions(+), 10 deletions(-)
--
2.34.0.rc2.393.gf8c9666880-goog
next 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 Hsin-Yi Wang [this message]
2021-11-23 11:21 ` [PATCH 1/3] dma: swiotlb: Allow restricted-dma-pool to customize IO_TLB_SEGSIZE Hsin-Yi Wang
2021-11-23 11:21 ` [PATCH 2/3] dt-bindings: Add io-tlb-segsize property for restricted-dma-pool Hsin-Yi Wang
2021-11-23 16:34 ` 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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