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linux-sg2042/drivers/iommu
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Tom Murphy 37ec8eb851 iommu/amd: Remove unnecessary locking from AMD iommu driver 
With or without locking it doesn't make sense for two writers to be
writing to the same IOVA range at the same time. Even with locking we
still have a race condition, whoever gets the lock first, so we still
can't be sure what the result will be. With locking the result will be
more sane, it will be correct for the last writer, but still useless
because we can't be sure which writer will get the lock last. It's a
fundamentally broken design to have two writers writing to the same
IOVA range at the same time.

So we can remove the locking and work on the assumption that no two
writers will be writing to the same IOVA range at the same time.

The only exception is when we have to allocate a middle page in the page
tables, the middle page can cover more than just the IOVA range a writer
has been allocated. However this isn't an issue in the AMD driver
because it can atomically allocate middle pages using "cmpxchg64()".

Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 		2019-10-15 11:31:03 +02:00
..
Kconfig ia64 for v5.4 - big change here is removal of support for SGI Altix 2019-09-16 15:32:01 -07:00
Makefile Merge branches 'arm/omap', 'arm/exynos', 'arm/smmu', 'arm/mediatek', 'arm/qcom', 'arm/renesas', 'x86/amd', 'x86/vt-d' and 'core' into next 2019-09-11 12:39:19 +02:00
amd_iommu.c iommu/amd: Remove unnecessary locking from AMD iommu driver 2019-10-15 11:31:03 +02:00
amd_iommu.h iommu/amd: Override wrong IVRS IOAPIC on Raven Ridge systems 2019-08-23 10:26:48 +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 iommu/amd: Override wrong IVRS IOAPIC on Raven Ridge systems 2019-08-23 10:26:48 +02:00
amd_iommu_proto.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
amd_iommu_quirks.c iommu/amd: Override wrong IVRS IOAPIC on Raven Ridge systems 2019-08-23 10:26:48 +02:00
amd_iommu_types.h iommu/amd: Remove unnecessary locking from AMD iommu driver 2019-10-15 11:31:03 +02:00
amd_iommu_v2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
arm-smmu-impl.c iommu/arm-smmu: Make private implementation details static 2019-08-20 10:58:03 +01:00
arm-smmu-v3.c LED updates for 5.4-rc1 2019-09-17 18:40:42 -07:00
arm-smmu.c Devicetree updates for v5.4: 2019-09-19 13:48:37 -07:00
arm-smmu.h Merge branches 'for-joerg/arm-smmu/smmu-v2' and 'for-joerg/arm-smmu/smmu-v3' into for-joerg/arm-smmu/updates 2019-08-23 15:05:45 +01:00
dma-iommu.c dma-mapping updates for 5.4: 2019-09-19 13:27:23 -07:00
dmar.c iommu/vt-d: Add Scalable Mode fault information 2019-09-11 12:36:53 +02:00
exynos-iommu.c Merge branches 'arm/omap', 'arm/exynos', 'arm/smmu', 'arm/mediatek', 'arm/qcom', 'arm/renesas', 'x86/amd', 'x86/vt-d' and 'core' into next 2019-09-11 12:39:19 +02:00
fsl_pamu.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
fsl_pamu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
fsl_pamu_domain.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
fsl_pamu_domain.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
hyperv-iommu.c iommu/hyper-v: Add Hyper-V stub IOMMU driver 2019-02-28 11:12:16 +01:00
intel-iommu-debugfs.c iommu/vt-d: Correctly check format of page table in debugfs 2019-08-09 17:29:25 +02:00
intel-iommu.c dma-mapping updates for 5.4: 2019-09-19 13:27:23 -07:00
intel-pasid.c Merge branches 'x86/vt-d', 'x86/amd', 'arm/smmu', 'arm/omap', 'generic-dma-ops' and 'core' into next 2019-07-04 17:26:48 +02:00
intel-pasid.h iommu/vt-d: Introduce macros useful for dumping DMAR table 2019-05-27 16:16:09 +02:00
intel-svm.c iommu/vt-d: Remove global page flush support 2019-09-03 15:01:27 +02:00
intel-trace.c iommu/vt-d: Add trace events for device dma map/unmap 2019-09-11 12:34:30 +02:00
intel_irq_remapping.c iommu/vt-d: Fix wrong analysis whether devices share the same bus 2019-08-30 15:47:37 +02:00
io-pgtable-arm-v7s.c Merge branch 'arm/smmu' into arm/mediatek 2019-08-30 16:12:10 +02:00
io-pgtable-arm.c iommu/io-pgtable: Pass struct iommu_iotlb_gather to ->tlb_add_page() 2019-07-29 17:22:59 +01:00
io-pgtable.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
iommu-debugfs.c iommu: Fix IOMMU debugfs fallout 2019-02-26 11:15:58 +01:00
iommu-sysfs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +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: Don't use sme_active() in generic code 2019-09-03 15:15:44 +02:00
iova.c iommu/iova: Avoid false sharing on fq_timer_on 2019-08-30 15:21:53 +02:00
ipmmu-vmsa.c Merge branches 'arm/omap', 'arm/exynos', 'arm/smmu', 'arm/mediatek', 'arm/qcom', 'arm/renesas', 'x86/amd', 'x86/vt-d' and 'core' into next 2019-09-11 12:39:19 +02:00
irq_remapping.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
irq_remapping.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
msm_iommu.c Merge branch 'for-joerg/batched-unmap' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into core 2019-08-20 11:09:43 +02:00
msm_iommu.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 267 2019-06-05 17:30:29 +02:00
msm_iommu_hw-8xxx.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 267 2019-06-05 17:30:29 +02:00
mtk_iommu.c Merge branch 'arm/smmu' into arm/mediatek 2019-08-30 16:12:10 +02:00
mtk_iommu.h iommu/mediatek: Clean up struct mtk_smi_iommu 2019-08-30 15:57:27 +02:00
mtk_iommu_v1.c Devicetree updates for v5.4: 2019-09-19 13:48:37 -07:00
of_iommu.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 335 2019-06-05 17:37:06 +02:00
omap-iommu-debug.c Merge branches 'x86/vt-d', 'x86/amd', 'arm/smmu', 'arm/omap', 'generic-dma-ops' and 'core' into next 2019-07-04 17:26:48 +02:00
omap-iommu.c Merge branches 'arm/omap', 'arm/exynos', 'arm/smmu', 'arm/mediatek', 'arm/qcom', 'arm/renesas', 'x86/amd', 'x86/vt-d' and 'core' into next 2019-09-11 12:39:19 +02:00
omap-iommu.h iommu/omap: add support for late attachment of iommu devices 2019-08-09 17:37:10 +02:00
omap-iopgtable.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
qcom_iommu.c Merge branches 'arm/omap', 'arm/exynos', 'arm/smmu', 'arm/mediatek', 'arm/qcom', 'arm/renesas', 'x86/amd', 'x86/vt-d' and 'core' into next 2019-09-11 12:39:19 +02:00
rockchip-iommu.c iommu: Pass struct iommu_iotlb_gather to ->unmap() and ->iotlb_sync() 2019-07-29 17:22:52 +01:00
s390-iommu.c iommu: Pass struct iommu_iotlb_gather to ->unmap() and ->iotlb_sync() 2019-07-29 17:22:52 +01:00
tegra-gart.c iommu: Pass struct iommu_iotlb_gather to ->unmap() and ->iotlb_sync() 2019-07-29 17:22:52 +01:00
tegra-smmu.c iommu: Pass struct iommu_iotlb_gather to ->unmap() and ->iotlb_sync() 2019-07-29 17:22:52 +01:00
virtio-iommu.c Merge branch 'for-joerg/arm-smmu/updates' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into arm/smmu 2019-08-23 17:41:59 +02:00