Tom Lendacky d334a5637d iommu/amd: Reduce amount of MMIO when submitting commands ... As newer, higher speed devices are developed, perf data shows that the amount of MMIO that is performed when submitting commands to the IOMMU causes performance issues. Currently, the command submission path reads the command buffer head and tail pointers and then writes the tail pointer once the command is ready. The tail pointer is only ever updated by the driver so it can be tracked by the driver without having to read it from the hardware. The head pointer is updated by the hardware, but can be read opportunistically. Reading the head pointer only when it appears that there might not be room in the command buffer and then re-checking the available space reduces the number of times the head pointer has to be read. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>		2017-06-08 14:31:03 +02:00
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amd_iommu.c	iommu/amd: Reduce amount of MMIO when submitting commands	2017-06-08 14:31:03 +02:00
amd_iommu_init.c	iommu/amd: Reduce amount of MMIO when submitting commands	2017-06-08 14:31:03 +02:00
amd_iommu_proto.h	x86/events, drivers/amd/iommu: Prepare for multiple IOMMUs support	2017-03-30 09:53:55 +02:00
amd_iommu_types.h	iommu/amd: Reduce amount of MMIO when submitting commands	2017-06-08 14:31:03 +02:00
amd_iommu_v2.c	iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()	2017-04-24 12:33:34 +02:00
arm-smmu-v3.c	Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next	2017-05-04 18:06:17 +02:00
arm-smmu.c	Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next	2017-05-04 18:06:17 +02:00
dma-iommu.c	iommu/dma: Plumb in the per-CPU IOVA caches	2017-04-03 12:45:03 +02:00
dmar.c	iommu/dmar: Remove redundant ' != 0' when check return code	2017-03-22 15:42:17 +01:00
exynos-iommu.c	Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next	2017-05-04 18:06:17 +02:00
fsl_pamu.c	powerpc/fsl: Move fsl_guts.h out of arch/powerpc	2015-10-21 18:05:50 -05:00
fsl_pamu.h	iommu: Remove pci.h include from trace/events/iommu.h	2017-04-29 00:20:49 +02:00
fsl_pamu_domain.c	iommu/fsl: Convert to device_group call-back	2015-10-22 00:00:49 +02:00
fsl_pamu_domain.h	iommu/fsl: Make use of domain_alloc and domain_free	2015-03-31 15:32:14 +02:00
intel-iommu.c	Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next	2017-05-04 18:06:17 +02:00
intel-svm.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h>	2017-03-02 08:42:28 +01:00
intel_irq_remapping.c	iommu/vt-d: Don't print the failure message when booting non-kdump kernel	2017-04-28 23:38:42 +02:00
io-pgtable-arm-v7s.c	iommu/io-pgtable-arm-v7s: Check for leaf entry before dereferencing it	2017-03-10 18:23:34 +00:00
io-pgtable-arm.c	iommu/io-pgtable-arm: Avoid shift overflow in block size	2017-04-06 16:06:44 +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: Add MTK 4GB mode in Short-descriptor	2016-04-05 15:39:37 +02:00
iommu-sysfs.c	iommu: Make iommu_device_link/unlink take a struct iommu_device	2017-02-10 13:44:57 +01:00
iommu-traces.c	iommu: Add iommu_error class event to iommu trace	2013-09-25 11:07:04 +02:00
iommu.c	Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next	2017-05-04 18:06:17 +02:00
iova.c	Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next	2017-05-04 18:06:17 +02:00
ipmmu-vmsa.c	iommu/ipmmu-vmsa: Restrict IOMMU Domain Geometry to 32-bit address space	2017-02-06 13:09:43 +01:00
irq_remapping.c	x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage	2016-04-13 11:37:41 +02:00
irq_remapping.h	iommu, x86: Setup Posted-Interrupts capability for Intel iommu	2015-06-12 11:33:52 +02:00
Kconfig	vfio: ccw: basic implementation for vfio_ccw driver	2017-03-31 12:55:04 +02:00
Makefile	Merge branches 'x86/amd', 'x86/vt-d', 'arm/exynos', 'arm/mediatek', 'arm/msm', 'arm/rockchip', 'arm/smmu' and 'core' into next	2016-07-26 16:02:37 +02:00
msm_iommu.c	iommu: Remove iommu_register_instance interface	2017-02-10 14:54:37 +01:00
msm_iommu.h	iommu/msm: Make use of iommu_device_register interface	2017-02-10 13:44:57 +01:00
msm_iommu_hw-8xxx.h	iommu/msm: Move mach includes to iommu directory	2013-08-06 11:18:03 -07:00
mtk_iommu.c	iommu: Remove iommu_register_instance interface	2017-02-10 14:54:37 +01:00
mtk_iommu.h	iommu/mediatek: Make use of iommu_device_register interface	2017-02-10 13:44:57 +01:00
mtk_iommu_v1.c	iommu/mediatek: Teach MTK-IOMMUv1 about 'struct iommu_device'	2017-04-03 13:17:02 +02:00
of_iommu.c	iommu: of: Handle IOMMU lookup failure with deferred probing or error	2017-04-20 16:31:07 +02:00
omap-iommu-debug.c	iommu/omap: Align code with open parenthesis	2016-04-05 17:53:20 +02:00
omap-iommu.c	iommu/omap: Add iommu-group support	2017-04-20 16:33:59 +02:00
omap-iommu.h	iommu/omap: Add iommu-group support	2017-04-20 16:33:59 +02:00
omap-iopgtable.h	iommu/omap: Use BIT(x) macros in omap-iopgtable.h	2015-08-03 16:04:42 +02:00
rockchip-iommu.c	Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next	2017-05-04 18:06:17 +02:00
s390-iommu.c	iommu/s390: Drop duplicate header pci.h	2016-11-29 17:37:58 +01:00
tegra-gart.c	Merge branches 'iommu/fixes', 'x86/vt-d', 'x86/amd', 'arm/smmu', 'arm/tegra' and 'core' into next	2015-04-02 13:33:19 +02:00
tegra-smmu.c	iommu: Remove pci.h include from trace/events/iommu.h	2017-04-29 00:20:49 +02:00