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linux-next/drivers/iommu
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Robin Murphy 6af588fed3 iommu: Add fast hook for getting DMA domains 
While iommu_get_domain_for_dev() is the robust way for arbitrary IOMMU
API callers to retrieve the domain pointer, for DMA ops domains it
doesn't scale well for large systems and multi-queue devices, since the
momentary refcount adjustment will lead to exclusive cacheline contention
when multiple CPUs are operating in parallel on different mappings for
the same device.

In the case of DMA ops domains, however, this refcounting is actually
unnecessary, since they already imply that the group exists and is
managed by platform code and IOMMU internals (by virtue of
iommu_group_get_for_dev()) such that a reference will already be held
for the lifetime of the device. Thus we can avoid the bottleneck by
providing a fast lookup specifically for the DMA code to retrieve the
default domain it already knows it has set up - a simple read-only
dereference plays much nicer with cache-coherency protocols.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2018-09-25 10:23:16 +02:00
..
amd_iommu_debugfs.c iommu/amd: Add basic debugfs infrastructure for AMD IOMMU 2018-07-06 14:06:30 +02:00
amd_iommu_init.c Merge branches 'arm/shmobile', 'arm/renesas', 'arm/msm', 'arm/smmu', 'arm/omap', 'x86/amd', 'x86/vt-d' and 'core' into next 2018-08-08 12:02:27 +02:00
amd_iommu_proto.h iommu/amd: Add basic debugfs infrastructure for AMD IOMMU 2018-07-06 14:06:30 +02:00
amd_iommu_types.h Merge branches 'arm/shmobile', 'arm/renesas', 'arm/msm', 'arm/smmu', 'arm/omap', 'x86/amd', 'x86/vt-d' and 'core' into next 2018-08-08 12:02:27 +02:00
amd_iommu_v2.c mm: convert return type of handle_mm_fault() caller to vm_fault_t 2018-08-17 16:20:28 -07:00
amd_iommu.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
arm-smmu-regs.h iommu/arm-smmu: Split out register defines 2017-08-15 17:34:48 +02:00
arm-smmu-v3.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
arm-smmu.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
dma-iommu.c iommu/dma: Respect bus DMA limit for IOVAs 2018-07-27 19:01:06 +02:00
dmar.c iommu/vt-d: Fix dev iotlb pfsid use 2018-07-06 13:26:10 +02:00
exynos-iommu.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
fsl_pamu_domain.c Merge branches 'arm/exynos', 'arm/renesas', 'arm/rockchip', 'arm/omap', 'arm/mediatek', 'arm/tegra', 'arm/qcom', 'arm/smmu', 'ppc/pamu', 'x86/vt-d', 'x86/amd', 's390' and 'core' into next 2017-09-01 11:31:42 +02:00
fsl_pamu_domain.h iommu/pamu: Fix PAMU boot crash 2017-08-23 16:28:09 +02:00
fsl_pamu.c Merge branches 'arm/exynos', 'arm/renesas', 'arm/rockchip', 'arm/omap', 'arm/mediatek', 'arm/tegra', 'arm/qcom', 'arm/smmu', 'ppc/pamu', 'x86/vt-d', 'x86/amd', 's390' and 'core' into next 2017-09-01 11:31:42 +02:00
fsl_pamu.h iommu/pamu: Fix PAMU boot crash 2017-08-23 16:28:09 +02:00
intel_irq_remapping.c irq_remapping: Use apic_ack_irq() 2018-06-06 15:18:20 +02:00
intel-iommu.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
intel-pasid.c iommu/vt-d: Per PCI device pasid table interfaces 2018-07-20 14:44:24 +02:00
intel-pasid.h iommu/vt-d: Per PCI device pasid table interfaces 2018-07-20 14:44:24 +02:00
intel-svm.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
io-pgtable-arm-v7s.c iommu/io-pgtable-arm-v7s: Abort allocation when table address overflows the PTE 2018-07-26 11:34:58 +01:00
io-pgtable-arm.c iommu/io-pgtable-arm: Fix pgtable allocation in selftest 2018-07-26 11:34:58 +01:00
io-pgtable.c iommu/io-pgtable: Fix a brace coding style issue. 2016-04-05 15:34:29 +02:00
io-pgtable.h iommu/io-pgtable: Use size_t return type for all foo_unmap 2018-02-13 19:31:32 +01:00
iommu-debugfs.c iommu: Enable debugfs exposure of IOMMU driver internals 2018-07-06 14:06:30 +02:00
iommu-sysfs.c iommu: Fix wrong freeing of iommu_device->dev 2017-08-15 13:58:48 +02:00
iommu-traces.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
iommu.c iommu: Add fast hook for getting DMA domains 2018-09-25 10:23:16 +02:00
iova.c iommu/iova: Optimise attempts to allocate iova from 32bit address range 2018-09-25 10:18:27 +02:00
ipmmu-vmsa.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
irq_remapping.c irq_remapping: Use apic_ack_irq() 2018-06-06 15:18:20 +02:00
irq_remapping.h irq_remapping: Use apic_ack_irq() 2018-06-06 15:18:20 +02:00
Kconfig Merge branches 'arm/shmobile', 'arm/renesas', 'arm/msm', 'arm/smmu', 'arm/omap', 'x86/amd', 'x86/vt-d' and 'core' into next 2018-08-08 12:02:27 +02:00
Makefile Merge branches 'arm/shmobile', 'arm/renesas', 'arm/msm', 'arm/smmu', 'arm/omap', 'x86/amd', 'x86/vt-d' and 'core' into next 2018-08-08 12:02:27 +02:00
msm_iommu_hw-8xxx.h
msm_iommu.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
msm_iommu.h iommu/msm: Make use of iommu_device_register interface 2017-02-10 13:44:57 +01:00
mtk_iommu_v1.c iommu: Remove the ->map_sg indirection 2018-08-08 11:06:20 +02:00
mtk_iommu.c iommu: Remove the ->map_sg indirection 2018-08-08 11:06:20 +02:00
mtk_iommu.h iommu/mediatek: Fix protect memory setting 2018-03-21 06:13:57 -05:00
of_iommu.c iommu: Remove IOMMU_OF_DECLARE 2018-07-10 17:22:35 +02:00
omap-iommu-debug.c iommu/omap: Fix debugfs_create_*() usage 2018-01-17 14:23:33 +01:00
omap-iommu.c Merge branches 'arm/shmobile', 'arm/renesas', 'arm/msm', 'arm/smmu', 'arm/omap', 'x86/amd', 'x86/vt-d' and 'core' into next 2018-08-08 12:02:27 +02:00
omap-iommu.h iommu/omap: Add support to program multiple iommus 2017-09-19 11:32:05 +02:00
omap-iopgtable.h iommu/omap: Use BIT(x) macros in omap-iopgtable.h 2015-08-03 16:04:42 +02:00
qcom_iommu.c IOMMU Update for Linux v4.19 2018-08-24 13:10:38 -07:00
rockchip-iommu.c ARM: SoC: late updates 2018-08-25 14:12:36 -07:00
s390-iommu.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tegra-gart.c iommu: Remove the ->map_sg indirection 2018-08-08 11:06:20 +02:00
tegra-smmu.c iommu: Remove the ->map_sg indirection 2018-08-08 11:06:20 +02:00