linux-kernel - Re: [PATCH 0/4] Add support for HiSilicon PCIe Tune and Trace device

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Date:   Tue, 6 Apr 2021 15:49:23 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yicong Yang <yangyicong@...ilicon.com>
Cc:     alexander.shishkin@...ux.intel.com, helgaas@...nel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        lorenzo.pieralisi@....com, jonathan.cameron@...wei.com,
        song.bao.hua@...ilicon.com, prime.zeng@...wei.com,
        linux-doc@...r.kernel.org, linuxarm@...wei.com
Subject: Re: [PATCH 0/4] Add support for HiSilicon PCIe Tune and Trace device

On Tue, Apr 06, 2021 at 08:45:50PM +0800, Yicong Yang wrote:
> HiSilicon PCIe tune and trace device(PTT) is a PCIe Root Complex
> integrated Endpoint(RCiEP) device, providing the capability
> to dynamically monitor and tune the PCIe traffic(tune),
> and trace the TLP headers(trace). The driver exposes the user
> interface through debugfs, so no need for extra user space tools.
> The usage is described in the document.

Why use debugfs and not the existing perf tools for debugging?

thanks,

greg k-h