From: Robin Murphy <robin.murphy@arm.com>
To: joro@8bytes.org, will@kernel.org
Cc: iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, suravee.suthikulpanit@amd.com,
baolu.lu@linux.intel.com, john.garry@huawei.com,
dianders@chromium.org
Subject: [PATCH 20/23] iommu: Allow choosing DMA strictness at build time
Date: Wed, 21 Jul 2021 19:20:31 +0100 [thread overview]
Message-ID: <002cd8280cc4935e294d79bef838fbfb633bb3ed.1626888445.git.robin.murphy@arm.com> (raw)
In-Reply-To: <cover.1626888444.git.robin.murphy@arm.com>
To parallel the sysfs behaviour, extend the build-time configuration
for default domains to include the new type as well.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
This effectively replaces patch #3 of John's "iommu: Enhance IOMMU
default DMA mode build options" series.
---
drivers/iommu/Kconfig | 48 +++++++++++++++++++++++++++++++++++--------
drivers/iommu/iommu.c | 2 +-
2 files changed, 41 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 07b7c25cbed8..e3f7990046ae 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -79,16 +79,48 @@ 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 "Default IOMMU domain type"
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_DMA_LAZY if INTEL_IOMMU || AMD_IOMMU
+ default IOMMU_DEFAULT_DMA_STRICT
- If unsure, say N here.
+config IOMMU_DEFAULT_DMA_STRICT
+ bool "Translated - Strict"
+ help
+ Trusted devices use translation to restrict their access to only
+ DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent
+ to passing "iommu.passthrough=0 iommu.strict=1" on the command line.
+
+ Untrusted devices always use this mode, with an additional layer of
+ bounce-buffering such that they cannot gain access to any unrelated
+ data within a mapped page.
+
+config IOMMU_DEFAULT_DMA_LAZY
+ bool "Translated - Lazy"
+ help
+ Trusted devices use translation to restrict their access to only
+ DMA-mapped pages, but with "lazy" batched TLB invalidation. This
+ mode allows higher performance with some IOMMUs due to reduced TLB
+ flushing, but at the cost of reduced isolation since devices may be
+ able to access memory for some time after it has been unmapped.
+ Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the
+ command line.
+
+ If this mode is not supported by the IOMMU driver, the effective
+ runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
+
+config IOMMU_DEFAULT_PASSTHROUGH
+ bool "Passthrough"
+ help
+ Trusted devices are identity-mapped, giving them unrestricted access
+ to memory with minimal performance overhead. Equivalent to passing
+ "iommu.passthrough=1" (historically "iommu=pt") on the command line.
+
+ If this mode is not supported by the IOMMU driver, the effective
+ runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
+
+endchoice
config OF_IOMMU
def_bool y
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index d3b562a33ac4..4fad6d427d9d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -30,7 +30,7 @@ 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_DMA_STRICT);
static u32 iommu_cmd_line __read_mostly;
struct iommu_group {
--
2.25.1
next prev parent reply other threads:[~2021-07-21 18:21 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-21 18:20 [PATCH 00/23] iommu: Refactor DMA domain strictness Robin Murphy
2021-07-21 18:20 ` [PATCH 01/23] iommu: Pull IOVA cookie management into the core Robin Murphy
2021-07-21 18:20 ` [PATCH 02/23] iommu/amd: Drop IOVA cookie management Robin Murphy
2021-07-21 18:20 ` [PATCH 03/23] iommu/arm-smmu: " Robin Murphy
2021-07-21 18:20 ` [PATCH 04/23] iommu/vt-d: " Robin Murphy
2021-07-21 18:20 ` [PATCH 05/23] iommu/exynos: " Robin Murphy
2021-07-21 18:20 ` [PATCH 06/23] iommu/ipmmu-vmsa: " Robin Murphy
2021-07-21 18:20 ` [PATCH 07/23] iommu/mtk: " Robin Murphy
2021-07-21 18:20 ` [PATCH 08/23] iommu/rockchip: " Robin Murphy
2021-07-21 18:20 ` [PATCH 09/23] iommu/sprd: " Robin Murphy
2021-07-21 18:20 ` [PATCH 10/23] iommu/sun50i: " Robin Murphy
2021-07-21 18:20 ` [PATCH 11/23] iommu/virtio: " Robin Murphy
2021-07-21 18:20 ` [PATCH 12/23] iommu/dma: Unexport " Robin Murphy
2021-07-21 18:20 ` [PATCH 13/23] iommu/dma: Remove redundant "!dev" checks Robin Murphy
2021-07-26 8:28 ` John Garry
2021-07-21 18:20 ` [PATCH 14/23] iommu: Introduce explicit type for non-strict DMA domains Robin Murphy
2021-07-21 18:20 ` [PATCH 15/23] iommu/amd: Prepare for multiple DMA domain types Robin Murphy
2021-07-21 18:20 ` [PATCH 16/23] iommu/arm-smmu: " Robin Murphy
2021-07-26 12:46 ` Joerg Roedel
2021-07-26 13:09 ` Robin Murphy
2021-07-26 18:43 ` Joerg Roedel
2021-07-21 18:20 ` [PATCH 17/23] iommu/vt-d: " Robin Murphy
2021-07-22 16:44 ` kernel test robot
2021-07-22 17:30 ` Robin Murphy
2021-07-22 18:44 ` kernel test robot
2021-07-24 5:23 ` Lu Baolu
2021-07-26 8:30 ` Robin Murphy
2021-07-21 18:20 ` [PATCH 18/23] iommu: Express DMA strictness via the domain type Robin Murphy
2021-07-24 5:29 ` Lu Baolu
2021-07-26 8:27 ` Robin Murphy
2021-07-26 11:31 ` Lu Baolu
2021-07-26 12:29 ` Lu Baolu
2021-07-26 12:43 ` Robin Murphy
2021-07-21 18:20 ` [PATCH 19/23] iommu: Expose DMA domain strictness via sysfs Robin Murphy
2021-07-21 18:20 ` Robin Murphy [this message]
2021-07-21 18:20 ` [PATCH 21/23] iommu/dma: Factor out flush queue init Robin Murphy
2021-07-21 18:20 ` [PATCH 22/23] iommu: Allow enabling non-strict mode dynamically Robin Murphy
2021-07-21 18:20 ` [PATCH 23/23] iommu/arm-smmu: Allow non-strict in pgtable_quirks interface Robin Murphy
2021-07-26 8:13 ` [PATCH 00/23] iommu: Refactor DMA domain strictness John Garry
2021-07-26 12:06 ` Robin Murphy
2021-07-26 13:02 ` Joerg Roedel
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