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Message-ID: <20190407124147.13576-1-thunder.leizhen@huawei.com> Date: Sun, 7 Apr 2019 20:41:41 +0800 From: Zhen Lei <thunder.leizhen@...wei.com> To: Jean-Philippe Brucker <jean-philippe.brucker@....com>, John Garry <john.garry@...wei.com>, Robin Murphy <robin.murphy@....com>, Will Deacon <will.deacon@....com>, Joerg Roedel <joro@...tes.org>, Jonathan Corbet <corbet@....net>, linux-doc <linux-doc@...r.kernel.org>, Sebastian Ott <sebott@...ux.ibm.com>, Gerald Schaefer <gerald.schaefer@...ibm.com>, "Martin Schwidefsky" <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, "Michael Ellerman" <mpe@...erman.id.au>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H . Peter Anvin" <hpa@...or.com>, David Woodhouse <dwmw2@...radead.org>, iommu <iommu@...ts.linux-foundation.org>, linux-kernel <linux-kernel@...r.kernel.org>, linux-s390 <linux-s390@...r.kernel.org>, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, x86 <x86@...nel.org>, linux-ia64 <linux-ia64@...r.kernel.org> CC: Zhen Lei <thunder.leizhen@...wei.com>, Hanjun Guo <guohanjun@...wei.com> Subject: [PATCH v4 0/6] normalize IOMMU dma mode boot options As Robin Murphy's suggestion: "It's also not necessarily obvious to the user how this interacts with IOMMU_DEFAULT_PASSTHROUGH, so if we really do go down this route, maybe it would be better to refactor the whole lot into a single selection of something like IOMMU_DEFAULT_MODE anyway." In this version, I tried to normalize the IOMMU dma mode boot options for all ARCHs. When IOMMU is enabled, there are 3 dma modes: paasthrough(bypass), lazy(mapping but defer the IOTLB invalidation), strict. But currently each ARCHs defined their private boot options, different with each other. For example, to enable/disable "passthrough", ARM64 use iommu.passthrough=1/0, X86 use iommu=pt/nopt, PPC/POWERNV use iommu=nobypass. Zhen Lei (6): iommu: use iommu.dma_mode to replace iommu.passthrough and iommu.strict iommu: keep dma mode build options consistent with cmdline options iommu: add iommu_default_dma_mode_get() helper s390/pci: use common boot option iommu.dma_mode powernv/iommu: use common boot option iommu.dma_mode x86/iommu: use common boot option iommu.dma_mode Documentation/admin-guide/kernel-parameters.txt | 42 +++++++------------- arch/ia64/include/asm/iommu.h | 2 - arch/ia64/kernel/pci-dma.c | 2 - arch/powerpc/platforms/powernv/pci-ioda.c | 23 +---------- arch/s390/pci/pci_dma.c | 20 +++------- arch/x86/include/asm/iommu.h | 1 - arch/x86/kernel/pci-dma.c | 20 ---------- drivers/iommu/Kconfig | 36 ++++++++++++++--- drivers/iommu/amd_iommu.c | 12 +++--- drivers/iommu/amd_iommu_init.c | 4 -- drivers/iommu/amd_iommu_types.h | 6 --- drivers/iommu/intel-iommu.c | 7 +--- drivers/iommu/iommu.c | 52 ++++++++++++++++--------- include/linux/iommu.h | 16 ++++++++ 14 files changed, 108 insertions(+), 135 deletions(-) -- 1.8.3
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