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Date:   Tue, 13 Jul 2021 10:05:23 +0100
From:   Lee Jones <lee.jones@linaro.org>
To:     Kevin Hilman <khilman@baylibre.com>
Cc:     Marc Zyngier <maz@kernel.org>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Jerome Brunet <jbrunet@baylibre.com>,
        linux-amlogic@lists.infradead.org,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] irqchip: irq-meson-gpio: make it possible to build
 as a module
Message-ID: <YO1XU2ySZL3d03RH@google.com>
References: <20201020072532.949137-1-narmstrong@baylibre.com>
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 <7hsga8kb8z.fsf@baylibre.com>
 <CAF2Aj3g6c8FEZb3e1by6sd8LpKLaeN5hsKrrQkZUvh8hosiW9A@mail.gmail.com>
 <87r1hwwier.wl-maz@kernel.org>
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On Mon, 14 Jun 2021, Kevin Hilman wrote:

> Marc Zyngier <maz@kernel.org> writes:
> 
> > On Fri, 21 May 2021 10:47:48 +0100,
> > Lee Jones <lee.jones@linaro.org> wrote:
> >> 
> >> [1  <text/plain; UTF-8 (quoted-printable)>]
> >> On Tue, 20 Oct 2020 at 19:23, Kevin Hilman <khilman@baylibre.com> wrote:
> >> 
> >> > Neil Armstrong <narmstrong@baylibre.com> writes:
> >> >
> >> > > In order to reduce the kernel Image size on multi-platform distributions,
> >> > > make it possible to build the Amlogic GPIO IRQ controller as a module
> >> > > by switching it to a platform driver.
> >> > >
> >> > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> >> >
> >> > Reviewed-by: Kevin Hilman <khilman@baylibre.com>
> >> > Tested-by: Kevin Hilman <khilman@baylibre.com>
> >> >
> >> > Tested as a module on meson-sm1-khadas-vim3l where the wired networking
> >> > uses GPIO IRQs.
> >> >
> >> 
> >> Good morning Neil, Kevin,
> >> 
> >> What happened to this set in the end?  I still don't see it in Mainline.
> >
> > Last time I tried this patch, it broke my test setup in non-obvious
> > ways. Has someone checked that the issue I reported back then has been
> > resolved now that fw_devlink is more usable?
> 
> OK, after much anticipation (and much delay due to me forgetting about
> this), I just gave this series a spin again on top of v5.13-rc6, and it
> seems to work fine with `fw_devlink=on`
> 
> I started with your config[1] and accepting all the defaults of any new
> configs.  IOW, I ran: yes '' | make oldconfig after copying your config
> to .config.
> 
> With that it seems to be working fine for me.
> 
> Right after boot (and before network probes) I see module loaded, but no
> users yet in /proc/interrupts:
> 
> / # uname -a
> Linux buildroot 5.13.0-rc6-00002-g679c8e852942 #5 SMP PREEMPT Mon Jun 14 15:08:40 PDT 2021 aarch64 GNU/Linux
> / # lsmod |grep gpio
> irq_meson_gpio         20480  0
> leds_gpio              16384  0
> / # cat /proc/interrupts
>            CPU0       CPU1       CPU2       CPU3
>   9:          0          0          0          0     GICv2  25 Level     vgic
>  11:          0          0          0          0     GICv2  30 Level     kvm guest ptimer
>  12:          0          0          0          0     GICv2  27 Level     kvm guest vtimer
>  13:       1416        916        534       1421     GICv2  26 Level     arch_timer
>  15:          5          0          0          0     GICv2  89 Edge      dw_hdmi_top_irq, ff600000.hdmi-tx
>  22:         38          0          0          0     GICv2 225 Edge      ttyAML0
>  23:         20          0          0          0     GICv2 227 Edge      ff805000.i2c
>  25:          2          0          0          0     GICv2 232 Edge      ff809000.adc
>  28:        322          0          0          0     GICv2  35 Edge      meson
>  31:          0          0          0          0     GICv2 222 Edge      ffe05000.sd
>  32:        787          0          0          0     GICv2 223 Edge      ffe07000.mmc
>  34:          0          0          0          0     GICv2 194 Level     panfrost-job
>  35:          0          0          0          0     GICv2 193 Level     panfrost-mmu
>  36:          3          0          0          0     GICv2 192 Level     panfrost-gpu
>  39:          0          0          0          0     GICv2  63 Level     ff400000.usb, ff400000.usb
>  40:         32          0          0          0     GICv2  62 Level     xhci-hcd:usb1
> IPI0:       425        544        664        925       Rescheduling interrupts
> IPI1:        86        166        269        136       Function call interrupts
> IPI2:         0          0          0          0       CPU stop interrupts
> IPI3:         0          0          0          0       CPU stop (for crash dump) interrupts
> IPI4:         0          0          0          0       Timer broadcast interrupts
> IPI5:         0          0          0          0       IRQ work interrupts
> IPI6:         0          0          0          0       CPU wake-up interrupts
> Err:          0
> 
> So then I init the network interface and PHY works, DHCP works etc.
> 
> / # udhcpc
> udhcpc: started, v1.31.1
> [  102.250449] meson8b-dwmac ff3f0000.ethernet eth0: PHY [0.0:00] driver [RTL8211F Gigabit Ethernet] (irq=37)
> [  102.256413] meson8b-dwmac ff3f0000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0
> [  102.269433] meson8b-dwmac ff3f0000.ethernet eth0: No Safety Features support found
> [  102.271357] meson8b-dwmac ff3f0000.ethernet eth0: PTP not supported by HW
> [  102.278493] meson8b-dwmac ff3f0000.ethernet eth0: configuring for phy/rgmii link mode
> udhcpc: sending discover
> [  104.743301] meson8b-dwmac ff3f0000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
> [  104.746470] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> udhcpc: sending discover
> udhcpc: sending select for 192.168.0.122
> udhcpc: lease of 192.168.0.122 obtained, lease time 600
> deleting routers
> adding dns 192.168.0.254
> adding dns 192.168.0.254
> / # cat /proc/interrupts
>            CPU0       CPU1       CPU2       CPU3
>   9:          0          0          0          0     GICv2  25 Level     vgic
>  11:          0          0          0          0     GICv2  30 Level     kvm guest ptimer
>  12:          0          0          0          0     GICv2  27 Level     kvm guest vtimer
>  13:       1575       1018        604       1588     GICv2  26 Level     arch_timer
>  14:          8          0          0          0     GICv2  40 Level     eth0
>  15:          5          0          0          0     GICv2  89 Edge      dw_hdmi_top_irq, ff600000.hdmi-tx
>  22:        132          0          0          0     GICv2 225 Edge      ttyAML0
>  23:         20          0          0          0     GICv2 227 Edge      ff805000.i2c
>  25:          2          0          0          0     GICv2 232 Edge      ff809000.adc
>  28:        322          0          0          0     GICv2  35 Edge      meson
>  31:          0          0          0          0     GICv2 222 Edge      ffe05000.sd
>  32:        787          0          0          0     GICv2 223 Edge      ffe07000.mmc
>  34:          0          0          0          0     GICv2 194 Level     panfrost-job
>  35:          0          0          0          0     GICv2 193 Level     panfrost-mmu
>  36:          3          0          0          0     GICv2 192 Level     panfrost-gpu
>  37:          2          0          0          0  meson-gpio-irqchip  26 Level     0.0:00
>  39:          0          0          0          0     GICv2  63 Level     ff400000.usb, ff400000.usb
>  40:         32          0          0          0     GICv2  62 Level     xhci-hcd:usb1
> IPI0:       476        567        720        956       Rescheduling interrupts
> IPI1:        93        166        270        137       Function call interrupts
> IPI2:         0          0          0          0       CPU stop interrupts
> IPI3:         0          0          0          0       CPU stop (for crash dump) interrupts
> IPI4:         0          0          0          0       Timer broadcast interrupts
> IPI5:         0          0          0          0       IRQ work interrupts
> IPI6:         0          0          0          0       CPU wake-up interrupts
> Err:          0
> / #
> 
> Kevin
> 
> [1] http://www.loen.fr/tmp/Config.full-arm64

Thanks Kevin.

Now that -rc1 is out, hopefully Marc can assign some time to this.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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