linux-kernel - Re: [PATCH 1/1] iommu/vt-d: Add qi

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Date:   Thu, 28 Jan 2021 11:32:48 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Will Deacon <will@...nel.org>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: Add qi_submit trace event

On Thu, Jan 14, 2021 at 05:04:00PM +0800, Lu Baolu wrote:
> This adds a new trace event to track the submissions of requests to the
> invalidation queue. This event will provide the information like:
> - IOMMU name
> - Invalidation type
> - Descriptor raw data
> 
> A sample output like:
> | qi_submit: iotlb_inv dmar1: 0x100e2 0x0 0x0 0x0
> | qi_submit: dev_tlb_inv dmar1: 0x1000000003 0x7ffffffffffff001 0x0 0x0
> | qi_submit: iotlb_inv dmar2: 0x800f2 0xf9a00005 0x0 0x0
> 
> This will be helpful for queued invalidation related debugging.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/intel/dmar.c         |  3 +++
>  include/trace/events/intel_iommu.h | 37 ++++++++++++++++++++++++++++++
>  2 files changed, 40 insertions(+)

Applied, thanks.