linux-kernel - Re: [PATCH] arm: Enlarge IO_SPACE

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Message-ID: <20210511145416.GM1336@shell.armlinux.org.uk>
Date:   Tue, 11 May 2021 15:54:16 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Abbott Liu <liuwenliang@...wei.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: Enlarge IO_SPACE_LIMIT needed for some SoC

On Tue, May 11, 2021 at 02:15:21PM +0200, Ansuel Smith wrote:
> 0000:01:00.0 Network controller: Qualcomm Atheros QCA9984 802.11ac Wave 2 Wireless Network Adapter
>         Subsystem: Qualcomm Atheros Device cafe
>         Device tree node: /sys/firmware/devicetree/base/soc/pci@...00000/bridge@0,0/wifi@1,0
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx+
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0, Cache Line Size: 64 bytes
>         Interrupt: pin A routed to IRQ 53
>         Region 0: Memory at 08000000 (64-bit, non-prefetchable) [size=2M]

It seems this Atheros device does not make any use of I/O, so this
device should be fine.

> 0001:01:00.0 Network controller: Qualcomm Atheros QCA9984 802.11ac Wave 2 Wireless Network Adapter
>         Subsystem: Qualcomm Atheros Device cafe
>         Device tree node: /sys/firmware/devicetree/base/soc/pci@...00000/bridge@0,0/wifi@1,0
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx+
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>         Latency: 0, Cache Line Size: 64 bytes
>         Interrupt: pin A routed to IRQ 54
>         Region 0: Memory at 2e000000 (64-bit, non-prefetchable) [size=2M]

This device also seems to not make use of any I/O.

I don't see any reason probing of these two drivers should fail if
there is no or reduced I/O space.

Please can you share the kernel messages so we can see exactly what is
failing and how?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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