SMMU problem found on LS2085A with 4.6-rc3

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From: yang.shi@linaro.org (Shi, Yang)
To: linux-arm-kernel@lists.infradead.org
Subject: SMMU problem found on LS2085A with 4.6-rc3
Date: Wed, 13 Apr 2016 12:31:53 -0700	[thread overview]
Message-ID: <570E9EA9.2070903@linaro.org> (raw)

Hi Will & Robin,

I just ran some quick test on my LS2085A board, which has 8 Cortex A57 
cores, with 4.6-rc3 kernel, but I found a regression issue with SMMU.

SMMU driver reports:

arm_smmu_global_fault: 297974 callbacks suppressed
arm_smmu_global_fault: 298561 callbacks suppressed
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu:         GFSR 0x80000004, GFSYNR0 0x00000008, 
GFSYNR1 0x00000300, GFSYNR2 0x00000000
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious
arm-smmu 5000000.iommu: Unexpected global fault, this could be serious


But, it is good with 4.5 kernel. I found the below commit causes it:

commit 9adb95949a343dac53b1cd81dc973b5f815c88d4
Author: Robin Murphy <robin.murphy@arm.com>
Date:   Tue Jan 26 18:06:36 2016 +0000

     iommu/arm-smmu: Support DMA-API domains

     With DMA mapping ops provided by the iommu-dma code, only a minimal
     contribution from the IOMMU driver is needed to create a suitable
     DMA-API domain for them to use. Implement this for the ARM SMMUs.

     Signed-off-by: Robin Murphy <robin.murphy@arm.com>
     Signed-off-by: Will Deacon <will.deacon@arm.com>

Any idea?

Thanks,
Yang

next             reply	other threads:[~2016-04-13 19:31 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-13 19:31 Shi, Yang [this message]
2016-04-14 12:04 ` SMMU problem found on LS2085A with 4.6-rc3 Robin Murphy
2016-04-14 23:07   ` Shi, Yang
2016-04-15 12:30     ` Robin Murphy
2016-04-15 17:19       ` Shi, Yang
2016-04-15 17:44         ` Robin Murphy
2016-04-15 17:55           ` Shi, Yang

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