linux-kernel - [PATCH v2 2/2] arm64: mm: reserve per-numa CMA after numa

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Date:   Thu, 25 Jun 2020 19:43:30 +1200
From:   Barry Song <song.bao.hua@...ilicon.com>
To:     <hch@....de>, <m.szyprowski@...sung.com>, <robin.murphy@....com>,
        <will@...nel.org>, <ganapatrao.kulkarni@...ium.com>,
        <catalin.marinas@....com>
CC:     <iommu@...ts.linux-foundation.org>, <linuxarm@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        "Barry Song" <song.bao.hua@...ilicon.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Steve Capper <steve.capper@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH v2 2/2] arm64: mm: reserve per-numa CMA after numa_init

Right now, smmu is using dma_alloc_coherent() to get memory to save queues
and tables. Typically, on ARM64 server, there is a default CMA located at
node0, which could be far away from node2, node3 etc.
with this patch, smmu will get memory from local numa node to save command
queues and page tables. that means dma_unmap latency will be shrunk much.
Meanwhile, when iommu.passthrough is on, device drivers which call dma_
alloc_coherent() will also get local memory and avoid the travel between
numa nodes.

Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Will Deacon <will@...nel.org>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc: Steve Capper <steve.capper@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>
---
 arch/arm64/mm/init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 1e93cfc7c47a..07d4d1fe7983 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -420,6 +420,8 @@ void __init bootmem_init(void)
 
 	arm64_numa_init();
 
+	dma_pernuma_cma_reserve();
+
 	/*
 	 * must be done after arm64_numa_init() which calls numa_init() to
 	 * initialize node_online_map that gets used in hugetlb_cma_reserve()
-- 
2.27.0