From: Greg KH <gregkh@linuxfoundation.org>
To: Wu Hao <hao.wu@intel.com>
Cc: Will Deacon <will@kernel.org>,
mdf@kernel.org, mark.rutland@arm.com, linux-fpga@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
atull@kernel.org, yilun.xu@intel.com,
Luwei Kang <luwei.kang@intel.com>
Subject: Re: [PATCH v7 2/2] fpga: dfl: fme: add performance reporting support
Date: Wed, 12 Feb 2020 05:20:45 -0800 [thread overview]
Message-ID: <20200212132045.GC1789899@kroah.com> (raw)
In-Reply-To: <20200212100211.GA10436@hao-dev>
On Wed, Feb 12, 2020 at 06:02:11PM +0800, Wu Hao wrote:
> On Tue, Feb 11, 2020 at 09:30:35PM -0800, Greg KH wrote:
> > On Wed, Feb 12, 2020 at 11:19:29AM +0800, Wu Hao wrote:
> > > On Mon, Feb 10, 2020 at 04:34:01PM +0000, Will Deacon wrote:
> > > > Hi,
> > > >
> > > > On Mon, Feb 10, 2020 at 11:47:49AM +0800, Wu Hao wrote:
> > > > > This patch adds support for performance reporting private feature
> > > > > for FPGA Management Engine (FME). Now it supports several different
> > > > > performance counters, including 'basic', 'cache', 'fabric', 'vtd'
> > > > > and 'vtd_sip'. It allows user to use standard linux tools to access
> > > > > these performance counters.
> > > >
> > > > I had a quick look at this, and it mostly looks alright to me. Just a few
> > > > high-level comments/questions:
> > >
> > > Hi Will
> > >
> > > Thanks a lot for the review! :)
> > >
> > > >
> > > > - I would still prefer for the PMU drivers to live under drivers/perf/
> > >
> > > Hm.. one possible way is to create a platform device, and introduce a new
> > > platform device driver under drivers/perf/.
> >
> > No, do not abuse platform drivers, you have a real device, use it.
>
> Sure, thanks for the comments. Then I don't have any other idea to move code to
> drivers/perf/ directory, so probably only can live with current code.
The location of the file in the kernel tree has no bearing on if you use
a platform device, a USB device, or a PCI device. It is just a location
of a file.
You are interacting with the perf api as the driver's primary userspace
api, so put the driver into the drivers/perf/ directory. That's all
that Will is asking you to do here.
greg k-h
next prev parent reply other threads:[~2020-02-12 13:20 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 3:47 [PATCH v7 0/2] add performance reporting support to FPGA DFL drivers Wu Hao
2020-02-10 3:47 ` [PATCH v7 1/2] Documentation: fpga: dfl: add description for performance reporting support Wu Hao
2020-02-10 3:47 ` [PATCH v7 2/2] fpga: dfl: fme: add " Wu Hao
2020-02-10 16:34 ` Will Deacon
2020-02-12 3:19 ` Wu Hao
2020-02-12 5:30 ` Greg KH
2020-02-12 10:02 ` Wu Hao
2020-02-12 13:20 ` Greg KH [this message]
2020-02-13 2:51 ` Wu Hao
2020-02-10 20:56 ` Greg KH
2020-02-12 2:39 ` Wu Hao
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