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Peter Anvin" , David Woodhouse , iommu , linux-kernel , linux-s390 , linuxppc-dev , x86 , linux-ia64 CC: Zhen Lei , Hanjun Guo Subject: [PATCH v6 1/1] iommu: enhance IOMMU dma mode build options Date: Thu, 18 Apr 2019 21:57:01 +0800 Message-ID: <20190418135701.24668-2-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.19.2.windows.1 In-Reply-To: <20190418135701.24668-1-thunder.leizhen@huawei.com> References: <20190418135701.24668-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.23.164] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org First, add build option IOMMU_DEFAULT_{LAZY|STRICT}, so that we have the opportunity to set {lazy|strict} mode as default at build time. Then put the three config options in an choice, make people can only choose one of the three at a time. The default IOMMU dma modes on each ARCHs have no change. Signed-off-by: Zhen Lei --- arch/ia64/kernel/pci-dma.c | 2 +- arch/powerpc/platforms/powernv/pci-ioda.c | 3 ++- arch/s390/pci/pci_dma.c | 2 +- arch/x86/kernel/pci-dma.c | 7 ++--- drivers/iommu/Kconfig | 44 ++++++++++++++++++++++++++----- drivers/iommu/amd_iommu_init.c | 3 ++- drivers/iommu/intel-iommu.c | 2 +- drivers/iommu/iommu.c | 3 ++- 8 files changed, 48 insertions(+), 18 deletions(-) -- 1.8.3 diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c index fe988c49f01ce6a..655511dbf3c3b34 100644 --- a/arch/ia64/kernel/pci-dma.c +++ b/arch/ia64/kernel/pci-dma.c @@ -22,7 +22,7 @@ int force_iommu __read_mostly; #endif -int iommu_pass_through; +int iommu_pass_through = IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH); static int __init pci_iommu_init(void) { diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 3ead4c237ed0ec9..383e082a9bb985c 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -85,7 +85,8 @@ void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level, va_end(args); } -static bool pnv_iommu_bypass_disabled __read_mostly; +static bool pnv_iommu_bypass_disabled __read_mostly = + !IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH); static bool pci_reset_phbs __read_mostly; static int __init iommu_setup(char *str) diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index 9e52d1527f71495..784ad1e0acecfb1 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -17,7 +17,7 @@ static struct kmem_cache *dma_region_table_cache; static struct kmem_cache *dma_page_table_cache; -static int s390_iommu_strict; +static int s390_iommu_strict = IS_ENABLED(CONFIG_IOMMU_DEFAULT_STRICT); static int zpci_refresh_global(struct zpci_dev *zdev) { diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index d460998ae828514..fb2bab42a0a3173 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -43,11 +43,8 @@ * It is also possible to disable by default in kernel config, and enable with * iommu=nopt at boot time. */ -#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH -int iommu_pass_through __read_mostly = 1; -#else -int iommu_pass_through __read_mostly; -#endif +int iommu_pass_through __read_mostly = + IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH); extern struct iommu_table_entry __iommu_table[], __iommu_table_end[]; diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 6f07f3b21816c64..8a1f1793cde76b4 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -74,17 +74,47 @@ config IOMMU_DEBUGFS debug/iommu directory, and then populate a subdirectory with entries as required. -config IOMMU_DEFAULT_PASSTHROUGH - bool "IOMMU passthrough by default" +choice + prompt "IOMMU dma mode" depends on IOMMU_API - help - Enable passthrough by default, removing the need to pass in - iommu.passthrough=on or iommu=pt through command line. If this - is enabled, you can still disable with iommu.passthrough=off - or iommu=nopt depending on the architecture. + default IOMMU_DEFAULT_PASSTHROUGH if (PPC_POWERNV && PCI) + default IOMMU_DEFAULT_LAZY if (AMD_IOMMU || INTEL_IOMMU || S390_IOMMU) + default IOMMU_DEFAULT_STRICT + help + This option allows IOMMU dma mode to be chose at build time, to + override the default dma mode of each ARCHs, removing the need to + pass in kernel parameters through command line. You can still use + ARCHs specific boot options to override this option again. + +config IOMMU_DEFAULT_PASSTHROUGH + bool "passthrough" + help + In this mode, the dma access through IOMMU without any addresses + transformation. That means, the wrong or illegal dma access can not + be caught, no error information will be reported. If unsure, say N here. +config IOMMU_DEFAULT_LAZY + bool "lazy" + help + Support lazy mode, where for every IOMMU DMA unmap operation, the + flush operation of IOTLB and the free operation of IOVA are deferred. + They are only guaranteed to be done before the related IOVA will be + reused. + +config IOMMU_DEFAULT_STRICT + bool "strict" + help + For every IOMMU DMA unmap operation, the flush operation of IOTLB and + the free operation of IOVA are guaranteed to be done in the unmap + function. + + This mode is safer than the two above, but it maybe slow in some high + performace scenarios. + +endchoice + config OF_IOMMU def_bool y depends on OF && IOMMU_API diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index ff40ba758cf365e..16c02b08adb4cb2 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -166,7 +166,8 @@ struct ivmd_header { to handle */ LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings we find in ACPI */ -bool amd_iommu_unmap_flush; /* if true, flush on every unmap */ +bool amd_iommu_unmap_flush = IS_ENABLED(CONFIG_IOMMU_DEFAULT_STRICT); + /* if true, flush on every unmap */ LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the system */ diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 28cb713d728ceef..0c3cc716210f35a 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -362,7 +362,7 @@ static int domain_detach_iommu(struct dmar_domain *domain, static int dmar_map_gfx = 1; static int dmar_forcedac; -static int intel_iommu_strict; +static int intel_iommu_strict = IS_ENABLED(CONFIG_IOMMU_DEFAULT_STRICT); static int intel_iommu_superpage = 1; static int intel_iommu_sm; static int iommu_identity_mapping; diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 109de67d5d727c2..0ec5952ac60e2a3 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -43,7 +43,8 @@ #else static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; #endif -static bool iommu_dma_strict __read_mostly = true; +static bool iommu_dma_strict __read_mostly = + IS_ENABLED(CONFIG_IOMMU_DEFAULT_STRICT); struct iommu_callback_data { const struct iommu_ops *ops;