linux-kernel - Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

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Date:   Sat, 8 Jul 2023 06:26:47 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Sergey Shtylyov <s.shtylyov@....ru>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linux regressions mailing list <regressions@...ts.linux.dev>
Subject: Re: [PATCH] sh: Avoid using IRQ0 on SH3 and SH4

On Thu, Jul 06, 2023 at 06:57:04AM -0700, Guenter Roeck wrote:
> Hi,
> 
> On Thu, Jun 01, 2023 at 11:22:17PM +0300, Sergey Shtylyov wrote:
> > IRQ0 is no longer returned by platform_get_irq() and its ilk -- they now
> > return -EINVAL instead.  However, the kernel code supporting SH3/4-based
> > SoCs still maps the IRQ #s starting at 0 -- modify that code to start the
> > IRQ #s from 16 instead.
> > 
> > The patch should mostly affect the AP-SH4A-3A/AP-SH4AD-0A boards as they
> > indeed are using IRQ0 for the SMSC911x compatible Ethernet chip.
> > 
> 
> Unfortunately it also affects all sh4 emulations in qemu, and results in
> boot stalls with those. There isn't a relevant log to attach because there
> is no error message - booting just stalls until the emulation is aborted.
> 
> Reverting this patch fixes the problem.
> 
> Bisect log is attached for reference. Note that bisect requires applying
> commit 7497840d462c ("sh: Provide unxlate_dev_mem_ptr() in asm/io.h"),
> which is also the reason why the problem was not observed earlier since
> it was hiding behind a build failure.
> 

Since -rc1 is coming up and there has been no progress, it is time to start
tracking this problem as regression.

#regzbot ^introduced a8ac2961148e
#regzbot title sh4: Boot stall with qemu emulations
#regzbot ignore-activity

> Guenter
> 
> ---
> # bad: [c17414a273b81fe4e34e11d69fc30cc8b1431614] Merge tag 'sh-for-v6.5-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/glaubitz/sh-linux
> # good: [b5641a5d8b8b14643bfe3d017d64da90a5c55479] mm: don't do validate_mm() unnecessarily and without mmap locking
> git bisect start 'HEAD' 'b5641a5d8b8b'
> # good: [15ac468614e5e4fee82e1eb32568f427b0e51adc] Merge tag 'media/v6.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
> git bisect good 15ac468614e5e4fee82e1eb32568f427b0e51adc
> # good: [73a3fcdaa73200e38e38f7e8a32c9b901c5b95b5] Merge tag 'f2fs-for-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
> git bisect good 73a3fcdaa73200e38e38f7e8a32c9b901c5b95b5
> # good: [6843306689aff3aea608e4d2630b2a5a0137f827] Merge tag 'net-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
> git bisect good 6843306689aff3aea608e4d2630b2a5a0137f827
> # good: [afa92949124abc25ddab1789dd654214e2e1b040] dt-bindings: phy: cdns,salvo: add property cdns,usb2-disconnect-threshold-microvolt
> git bisect good afa92949124abc25ddab1789dd654214e2e1b040
> # good: [37bd215fc48ef2a399f836d62d2e4a166efb31be] phy: qualcomm: fix indentation in Makefile
> git bisect good 37bd215fc48ef2a399f836d62d2e4a166efb31be
> # bad: [7497840d462c8f54c4888c22ab3726a8cde4b9a2] sh: Provide unxlate_dev_mem_ptr() in asm/io.h
> git bisect bad 7497840d462c8f54c4888c22ab3726a8cde4b9a2
> # bad: [01658fe3d6c02992846a038c8111e70ace169295] sh: Refactor header include path addition
> git bisect bad 01658fe3d6c02992846a038c8111e70ace169295
> # bad: [a8ac2961148e8c720dc760f2e06627cd5c55a154] sh: Avoid using IRQ0 on SH3 and SH4
> git bisect bad a8ac2961148e8c720dc760f2e06627cd5c55a154
> # good: [bc9d1f0cecd2407cfb2364a7d4be2f52d1d46a9d] sh: j2: Use ioremap() to translate device tree address into kernel memory
> git bisect good bc9d1f0cecd2407cfb2364a7d4be2f52d1d46a9d
> # first bad commit: [a8ac2961148e8c720dc760f2e06627cd5c55a154] sh: Avoid using IRQ0 on SH3 and SH4