linux-kernel - [PATCH 0/2] swiotlb: Split up single swiotlb lock

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Date:   Mon, 27 Jun 2022 11:31:48 -0400
From:   Tianyu Lan <ltykernel@...il.com>
To:     corbet@....net, rafael@...nel.org, len.brown@...el.com,
        pavel@....cz, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        hch@...radead.org, m.szyprowski@...sung.com, robin.murphy@....com,
        paulmck@...nel.org, akpm@...ux-foundation.org,
        keescook@...omium.org, songmuchun@...edance.com,
        rdunlap@...radead.org, damien.lemoal@...nsource.wdc.com,
        michael.h.kelley@...rosoft.com, kys@...rosoft.com
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        vkuznets@...hat.com, wei.liu@...nel.org, parri.andrea@...il.com,
        thomas.lendacky@....com, linux-hyperv@...r.kernel.org,
        kirill.shutemov@...el.com, andi.kleen@...el.com
Subject: [PATCH 0/2] swiotlb: Split up single swiotlb lock

From: Tianyu Lan <Tianyu.Lan@...rosoft.com>

Traditionally swiotlb was not performance critical because it was only
used for slow devices. But in some setups, like TDX/SEV confidential
guests, all IO has to go through swiotlb. Currently swiotlb only has a
single lock. Under high IO load with multiple CPUs this can lead to
significat lock contention on the swiotlb lock.

Patch 1 is to introduce swiotlb area concept and split up single swiotlb
lock.
Patch 2 set swiotlb area number with lapic number


Tianyu Lan (2):
  swiotlb: Split up single swiotlb lock
  x86/ACPI: Set swiotlb area according to the number of lapic entry in
    MADT

 .../admin-guide/kernel-parameters.txt         |   4 +-
 arch/x86/kernel/acpi/boot.c                   |   3 +
 include/linux/swiotlb.h                       |  27 +++
 kernel/dma/swiotlb.c                          | 202 ++++++++++++++----
 4 files changed, 197 insertions(+), 39 deletions(-)

-- 
2.25.1