From: John Garry <john.garry@huawei.com> To: <joro@8bytes.org>, <will@kernel.org>, <dwmw2@infradead.org>, <baolu.lu@linux.intel.com>, <robin.murphy@arm.com> Cc: <linux-kernel@vger.kernel.org>, <iommu@lists.linux-foundation.org>, <linuxarm@huawei.com>, <thunder.leizhen@huawei.com>, <chenxiang66@hisilicon.com>, John Garry <john.garry@huawei.com> Subject: [PATCH v10 1/3] iommu: Enhance IOMMU default DMA mode build options Date: Thu, 3 Jun 2021 21:58:33 +0800 [thread overview] Message-ID: <1622728715-209296-2-git-send-email-john.garry@huawei.com> (raw) In-Reply-To: <1622728715-209296-1-git-send-email-john.garry@huawei.com> From: Zhen Lei <thunder.leizhen@huawei.com> First, add build options IOMMU_DEFAULT_{LAZY|STRICT}, so that we have the opportunity to set {lazy|strict} mode as default at build time. Then put the two config options in an choice, as they are mutually-exclusive. [jpg: Make choice between strict and lazy only (and not passthrough)] Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: John Garry <john.garry@huawei.com> --- drivers/iommu/Kconfig | 34 ++++++++++++++++++++++++++++++++++ drivers/iommu/iommu.c | 3 ++- 2 files changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 1f111b399bca..12ef90256df8 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -90,6 +90,40 @@ config IOMMU_DEFAULT_PASSTHROUGH If unsure, say N here. +choice + prompt "IOMMU default DMA mode" + depends on IOMMU_API + + default IOMMU_DEFAULT_STRICT + help + This option allows an IOMMU DMA mode to be chosen at build time, to + override the default DMA mode of each ARCH, removing the need to + pass in kernel parameters through command line. It is still possible + to provide ARCH-specific or common boot options to override this + option. + + If unsure, keep the default. + +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 slower in some + high performace scenarios. + +endchoice + config OF_IOMMU def_bool y depends on OF && IOMMU_API diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 966426a96520..177b0dafc535 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -29,7 +29,8 @@ static struct kset *iommu_group_kset; static DEFINE_IDA(iommu_group_ida); static unsigned int iommu_def_domain_type __read_mostly; -static bool iommu_dma_strict __read_mostly = true; +static bool iommu_dma_strict __read_mostly = + IS_ENABLED(CONFIG_IOMMU_DEFAULT_STRICT); static u32 iommu_cmd_line __read_mostly; struct iommu_group { -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: John Garry <john.garry@huawei.com> To: <joro@8bytes.org>, <will@kernel.org>, <dwmw2@infradead.org>, <baolu.lu@linux.intel.com>, <robin.murphy@arm.com> Cc: linux-kernel@vger.kernel.org, linuxarm@huawei.com, iommu@lists.linux-foundation.org Subject: [PATCH v10 1/3] iommu: Enhance IOMMU default DMA mode build options Date: Thu, 3 Jun 2021 21:58:33 +0800 [thread overview] Message-ID: <1622728715-209296-2-git-send-email-john.garry@huawei.com> (raw) In-Reply-To: <1622728715-209296-1-git-send-email-john.garry@huawei.com> From: Zhen Lei <thunder.leizhen@huawei.com> First, add build options IOMMU_DEFAULT_{LAZY|STRICT}, so that we have the opportunity to set {lazy|strict} mode as default at build time. Then put the two config options in an choice, as they are mutually-exclusive. [jpg: Make choice between strict and lazy only (and not passthrough)] Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: John Garry <john.garry@huawei.com> --- drivers/iommu/Kconfig | 34 ++++++++++++++++++++++++++++++++++ drivers/iommu/iommu.c | 3 ++- 2 files changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 1f111b399bca..12ef90256df8 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -90,6 +90,40 @@ config IOMMU_DEFAULT_PASSTHROUGH If unsure, say N here. +choice + prompt "IOMMU default DMA mode" + depends on IOMMU_API + + default IOMMU_DEFAULT_STRICT + help + This option allows an IOMMU DMA mode to be chosen at build time, to + override the default DMA mode of each ARCH, removing the need to + pass in kernel parameters through command line. It is still possible + to provide ARCH-specific or common boot options to override this + option. + + If unsure, keep the default. + +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 slower in some + high performace scenarios. + +endchoice + config OF_IOMMU def_bool y depends on OF && IOMMU_API diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 966426a96520..177b0dafc535 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -29,7 +29,8 @@ static struct kset *iommu_group_kset; static DEFINE_IDA(iommu_group_ida); static unsigned int iommu_def_domain_type __read_mostly; -static bool iommu_dma_strict __read_mostly = true; +static bool iommu_dma_strict __read_mostly = + IS_ENABLED(CONFIG_IOMMU_DEFAULT_STRICT); static u32 iommu_cmd_line __read_mostly; struct iommu_group { -- 2.26.2 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2021-06-03 14:03 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-03 13:58 [PATCH v10 0/3] Enhance IOMMU default DMA mode build options John Garry 2021-06-03 13:58 ` John Garry 2021-06-03 13:58 ` John Garry [this message] 2021-06-03 13:58 ` [PATCH v10 1/3] iommu: " John Garry 2021-06-03 17:00 ` Randy Dunlap 2021-06-03 17:00 ` Randy Dunlap 2021-06-03 17:04 ` John Garry 2021-06-03 17:04 ` John Garry 2021-06-04 2:54 ` Leizhen (ThunderTown) 2021-06-04 2:54 ` Leizhen (ThunderTown) 2021-06-04 8:19 ` John Garry 2021-06-04 8:19 ` John Garry 2021-06-03 13:58 ` [PATCH v10 2/3] iommu/vt-d: Add support for " John Garry 2021-06-03 13:58 ` John Garry 2021-06-03 13:58 ` [PATCH v10 3/3] iommu/amd: " John Garry 2021-06-03 13:58 ` John Garry
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