From: DENG Qingfang <dqfext@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: "Marc Zyngier" <maz@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Florian Fainelli" <f.fainelli@gmail.com>,
"Heiner Kallweit" <hkallweit1@gmail.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Landen Chao" <Landen.Chao@mediatek.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"Russell King" <linux@armlinux.org.uk>,
"Sean Wang" <sean.wang@mediatek.com>,
"Vivien Didelot" <vivien.didelot@gmail.com>,
"Vladimir Oltean" <olteanv@gmail.com>,
"Rob Herring" <robh+dt@kernel.org>,
"Linus Walleij" <linus.walleij@linaro.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Sergio Paracuellos" <sergio.paracuellos@gmail.com>,
linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
linux-staging@lists.linux.dev, devicetree@vger.kernel.org,
netdev@vger.kernel.org, "Weijie Gao" <weijie.gao@mediatek.com>,
"Chuanhong Guo" <gch981213@gmail.com>,
"René van Dorst" <opensource@vdorst.com>,
"Frank Wunderlich" <frank-w@public-files.de>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Greg Ungerer" <gerg@kernel.org>
Subject: Re: [RFC v4 net-next 2/4] net: dsa: mt7530: add interrupt support
Date: Tue, 13 Apr 2021 23:29:20 +0800 [thread overview]
Message-ID: <20210413152920.2190769-1-dqfext@gmail.com> (raw)
In-Reply-To: <YHWUK+tG3v9ZU/DT@lunn.ch>
On Tue, Apr 13, 2021 at 02:52:59PM +0200, Andrew Lunn wrote:
> > I guess this is depends whether the most usual case is to have all
> > these interrupts being actively in use or not. Most interrupts only
> > use a limited portion of their interrupt space at any given time.
> > Allocating all interrupts and creating mappings upfront is a waste of
> > memory.
> >
> > If the use case here is that all these interrupts will be wired and
> > used in most cases, then upfront allocation is probably not a problem.
>
> Hi Marc
>
> The interrupts are generally used. Since this is an Ethernet switch,
> generally the port is administratively up, even if there is no cable
> plugged in. Once/if a cable is plugged in and there is a link peer,
> the PHY will interrupt to indicate this.
>
> The only real case i can think of when the interrupts are not used is
> when the switch has more ports than connected to the front panel. This
> can happen in industrial settings, but not SOHO. Those ports which
> don't go anywhere are never configured up and so the interrupt is
> never used.
Hi Andrew
This is what the extra check (BIT(p) & ds->phys_mii_mask) avoids.
Currently the mv88e6xxx driver does not have this check, and creates
15 PHY IRQ mappings on my 88E6176 unconditionally, leaving a gap in
/proc/interrupts:
...
57: 0 0 mv88e6xxx-g1 3 Edge mv88e6xxx-f1072004.mdio-mii:00-g1-atu-prob
59: 0 0 mv88e6xxx-g1 5 Edge mv88e6xxx-f1072004.mdio-mii:00-g1-vtu-prob
61: 8 5 mv88e6xxx-g1 7 Edge mv88e6xxx-f1072004.mdio-mii:00-g2
63: 8 4 mv88e6xxx-g2 0 Edge mv88e6xxx-1:00
64: 0 0 mv88e6xxx-g2 1 Edge mv88e6xxx-1:01
65: 0 0 mv88e6xxx-g2 2 Edge mv88e6xxx-1:02
66: 0 0 mv88e6xxx-g2 3 Edge mv88e6xxx-1:03
67: 0 2 mv88e6xxx-g2 4 Edge mv88e6xxx-1:04
// IRQ 68~77 are created but not used
78: 0 0 mv88e6xxx-g2 15 Edge mv88e6xxx-f1072004.mdio-mii:00-watchdog
...
You may as well add irq_set_nested_thread(irq, true) to irq_domain_map
so all IRQs share a single thread.
>
> Andrew
next prev parent reply other threads:[~2021-04-13 15:29 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 3:42 [RFC v4 net-next 0/4] MT7530 interrupt support DENG Qingfang
2021-04-12 3:42 ` [RFC v4 net-next 1/4] net: phy: add MediaTek PHY driver DENG Qingfang
2021-04-12 7:04 ` René van Dorst
2021-04-12 15:08 ` DENG Qingfang
2021-04-13 3:59 ` DENG Qingfang
2021-04-13 9:55 ` René van Dorst
2021-04-13 13:12 ` Russell King - ARM Linux admin
2021-04-15 9:49 ` DENG Qingfang
2021-04-12 3:42 ` [RFC v4 net-next 2/4] net: dsa: mt7530: add interrupt support DENG Qingfang
2021-04-12 8:21 ` Marc Zyngier
2021-04-12 15:22 ` DENG Qingfang
2021-04-13 0:07 ` Andrew Lunn
2021-04-13 8:06 ` Marc Zyngier
2021-04-13 12:52 ` Andrew Lunn
2021-04-13 15:29 ` DENG Qingfang [this message]
2021-04-12 3:42 ` [RFC v4 net-next 3/4] dt-bindings: net: dsa: add MT7530 interrupt controller binding DENG Qingfang
2021-04-12 10:33 ` Kurt Kanzenbach
2021-04-12 3:42 ` [RFC v4 net-next 4/4] staging: mt7621-dts: enable MT7530 interrupt controller DENG Qingfang
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