linux-kernel - [PATCH v2 0/2] bugfix and optimization about CMD

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Message-ID: <1533815333-17320-1-git-send-email-thunder.leizhen@huawei.com>
Date:   Thu, 9 Aug 2018 19:48:51 +0800
From:   Zhen Lei <thunder.leizhen@...wei.com>
To:     Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
CC:     Zhen Lei <thunder.leizhen@...wei.com>,
        LinuxArm <linuxarm@...wei.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Libin <huawei.libin@...wei.com>
Subject: [PATCH v2 0/2] bugfix and optimization about CMD_SYNC

v1->v2:
1. move the call to arm_smmu_cmdq_build_cmd into the critical section,
   and keep itself unchange.
2. Although patch2 can make sure no two CMD_SYNCs will be adjacent,
but patch1 is still needed, see below:

cpu0			cpu1			cpu2
msidata=0
			msidata=1
			insert cmd1
						insert a TLBI command
insert cmd0
			smmu execute cmd1
						smmu execute TLBI
smmu execute cmd0
			poll timeout, because msidata=1 is overridden by
			cmd0, that means VAL=0, sync_idx=1.

Zhen Lei (2):
  iommu/arm-smmu-v3: fix unexpected CMD_SYNC timeout
  iommu/arm-smmu-v3: avoid redundant CMD_SYNCs if possible

 drivers/iommu/arm-smmu-v3.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

-- 
1.8.3