linux-kernel - Re: [PATCH v9 0/9] PCI: Add PCIe bandwidth controller

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Message-ID: <20241113214850.GA1912974@bhelgaas>
Date: Wed, 13 Nov 2024 15:48:50 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	"Maciej W . Rozycki" <macro@...am.me.uk>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Lukas Wunner <lukas@...ner.de>,
	Alexandru Gagniuc <mr.nuke.me@...il.com>,
	Krishna chaitanya chundru <quic_krichai@...cinc.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
	Smita Koralahalli <Smita.KoralahalliChannabasappa@....com>,
	linux-kernel@...r.kernel.org,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Amit Kucheria <amitk@...nel.org>, Zhang Rui <rui.zhang@...el.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Amit Pundir <amit.pundir@...aro.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Caleb Connolly <caleb.connolly@...aro.org>
Subject: Re: [PATCH v9 0/9] PCI: Add PCIe bandwidth controller

[+cc Bart, Amit, Neil, Caleb]

On Wed, Oct 23, 2024 at 05:19:04PM -0500, Bjorn Helgaas wrote:
> On Fri, Oct 18, 2024 at 05:47:46PM +0300, Ilpo Järvinen wrote:
> > This series adds PCIe bandwidth controller (bwctrl) and associated PCIe
> > cooling driver to the thermal core side for limiting PCIe Link Speed
> > due to thermal reasons. PCIe bandwidth controller is a PCI express bus
> > port service driver. A cooling device is created for each port the
> > service driver finds to support changing speeds.

> >  drivers/pci/pcie/bwctrl.c                     | 366 ++++++++++++++++++
> >  include/linux/pci-bwctrl.h                    |  28 ++
> >  tools/testing/selftests/pcie_bwctrl/Makefile  |   2 +
> >  .../pcie_bwctrl/set_pcie_cooling_state.sh     | 122 ++++++
> >  .../selftests/pcie_bwctrl/set_pcie_speed.sh   |  67 ++++

> Applied to pci/bwctrl for v6.13, thanks Ilpo (and Alexandru, for the
> bandwidth notification interrupt support)!

How attached are we to "bwctrl" and "pwrctl" as the names?

I just noticed that we have "ctrl" for bandwidth control but "ctl" for
power control, which is slightly annoying to keep straight.

"ctrl" is more common in the tree:

  $ find -name \*ctrl\*[ch] | wc -l
  691
  $ find -name \*ctl\*[ch] | wc -l
  291

so I would prefer that, although "pwrctl" is already in the tree (as
of v6.11), so it would be more disruptive to change it than to rename
"bwctrl".