Re: [PATCH 0/3] AMD IOMMUv2 Performance Counter patches

[Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

On Mon, Jan 21, 2013 at 02:20:55PM -0600, Steven L. Kinney wrote:
> From: "Steven L. Kinney" <steven.kinney-5C7GfCeVMHo@public.gmane.org>
> 
> These patches implement the AMD IOMMUv2.5 Performance Counter functionality
> via custom perf PMU and implement static counting for various IOMMU
> translations.  The patches address three areas of functionality:
> 
> 1) 	Add a PCI quirk for the enablement of IOMMUv2 EFR PC within a specific
> 	AMD family/model in which BIOS has not enabled.  Based on code 
> 	implemented by Andreas Herrmann at AMD Dresden.
> 2)	Extend the AMD IOMMU initialization to include IOMMUv2 PC enablement
> 	and access to IOMMUv2 counter registers.  For all AMD family/models
> 	that implement IOMMUv2.5 functionality.
> 3)	Code the perf IOMMUv2 PMU to manage IOMMUv2 perf events, which call
> 	the function(s) extending the AMD IOMMU core driver.  For all AMD
> 	family/models that implement IOMMUv2.5 functionality.
> 
> The command-line, to invoke the iommuv2 PMU, is:
> 
> perf stat -e iommuv2/config=[data],config1=[data]/{u,r} [command]
> 
> For information regarding AMD IOMMU v2.5 PC configuration, see the public
> specification.

Is there a name for it? I see
http://support.amd.com/us/Processor_TechDocs/48882.pdf
but that looks to be for v2.0?
> 
> Steven L. Kinney (3):
>   AMD x86 quirks: Quirk for enabling IOMMUv2 PC feature
>   AMD IOMMUv2 PC resource management hooks
>   AMD IOMMUv2 PC perf PMU implementation
> 
>  arch/x86/kernel/cpu/Makefile                 |    1 +
>  arch/x86/kernel/cpu/perf_event_amd_iommuv2.c |  429 ++++++++++++++++++++++++++
>  arch/x86/kernel/cpu/perf_event_amd_iommuv2.h |   42 +++
>  arch/x86/kernel/quirks.c                     |   17 +
>  drivers/iommu/Kconfig                        |   10 +
>  drivers/iommu/amd_iommu_init.c               |   99 ++++++
>  drivers/iommu/amd_iommu_types.h              |   12 +
>  include/linux/pci_ids.h                      |    2 +
>  8 files changed, 612 insertions(+)
>  create mode 100644 arch/x86/kernel/cpu/perf_event_amd_iommuv2.c
>  create mode 100644 arch/x86/kernel/cpu/perf_event_amd_iommuv2.h
> 
> -- 
> 1.7.9.5
> 
> 
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