linux-kernel - Re: [PATCH 20/27] Documentation: x86: convert i386/IO-APIC.txt to reST

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Message-ID: <20190502054202.x2oli2ceseneyzdo@mail.google.com>
Date:   Thu, 2 May 2019 13:42:04 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc:     Changbin Du <changbin.du@...il.com>,
        Jonathan Corbet <corbet@....net>, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 20/27] Documentation: x86: convert i386/IO-APIC.txt to
 reST

On Sat, Apr 27, 2019 at 03:24:49PM -0300, Mauro Carvalho Chehab wrote:
> Em Fri, 26 Apr 2019 23:31:43 +0800
> Changbin Du <changbin.du@...il.com> escreveu:
> 
> > This converts the plain text documentation to reStructuredText format and
> > add it to Sphinx TOC tree. No essential content change.
> > 
> > Signed-off-by: Changbin Du <changbin.du@...il.com>
> > ---
> >  .../x86/i386/{IO-APIC.txt => IO-APIC.rst}     | 26 ++++++++++++-------
> >  Documentation/x86/i386/index.rst              | 10 +++++++
> >  Documentation/x86/index.rst                   |  1 +
> >  3 files changed, 27 insertions(+), 10 deletions(-)
> >  rename Documentation/x86/i386/{IO-APIC.txt => IO-APIC.rst} (93%)
> >  create mode 100644 Documentation/x86/i386/index.rst
> > 
> > diff --git a/Documentation/x86/i386/IO-APIC.txt b/Documentation/x86/i386/IO-APIC.rst
> > similarity index 93%
> > rename from Documentation/x86/i386/IO-APIC.txt
> > rename to Documentation/x86/i386/IO-APIC.rst
> > index 15f5baf7e1b6..aec98f742763 100644
> > --- a/Documentation/x86/i386/IO-APIC.txt
> > +++ b/Documentation/x86/i386/IO-APIC.rst
> > @@ -1,3 +1,11 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +=======
> > +IO-APIC
> > +=======
> > +
> > +:Author: Ingo Molnar <mingo@...nel.org>
> > +
> >  Most (all) Intel-MP compliant SMP boards have the so-called 'IO-APIC',
> >  which is an enhanced interrupt controller. It enables us to route
> >  hardware interrupts to multiple CPUs, or to CPU groups. Without an
> > @@ -13,7 +21,7 @@ usually worked around by the kernel. If your MP-compliant SMP board does
> >  not boot Linux, then consult the linux-smp mailing list archives first.
> >  
> >  If your box boots fine with enabled IO-APIC IRQs, then your
> > -/proc/interrupts will look like this one:
> > +/proc/interrupts will look like this one::
> >  
> >     ---------------------------->
> ...
>      <----------------------------
> 
> I would remove those lines, as they sounds like a way used by the
> doc author to "escape" a literal block.
>
Removed.

> Either way:
> 
> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
> 
> 
> >    hell:~> cat /proc/interrupts  
> > @@ -37,14 +45,14 @@ none of those IRQ sources is performance-critical.
> >  In the unlikely case that your board does not create a working mp-table,
> >  you can use the pirq= boot parameter to 'hand-construct' IRQ entries. This
> >  is non-trivial though and cannot be automated. One sample /etc/lilo.conf
> > -entry:
> > +entry::
> >  
> >  	append="pirq=15,11,10"
> >  
> >  The actual numbers depend on your system, on your PCI cards and on their
> >  PCI slot position. Usually PCI slots are 'daisy chained' before they are
> >  connected to the PCI chipset IRQ routing facility (the incoming PIRQ1-4
> > -lines):
> > +lines)::
> >  
> >                 ,-.        ,-.        ,-.        ,-.        ,-.
> >       PIRQ4 ----| |-.    ,-| |-.    ,-| |-.    ,-| |--------| |
> > @@ -56,7 +64,7 @@ lines):
> >       PIRQ1 ----| |-  `----| |-  `----| |-  `----| |--------| |
> >                 `-'        `-'        `-'        `-'        `-'
> >  
> > -Every PCI card emits a PCI IRQ, which can be INTA, INTB, INTC or INTD:
> > +Every PCI card emits a PCI IRQ, which can be INTA, INTB, INTC or INTD::
> >  
> >                                 ,-.
> >                           INTD--| |
> > @@ -78,19 +86,19 @@ to have non shared interrupts). Slot5 should be used for videocards, they
> >  do not use interrupts normally, thus they are not daisy chained either.
> >  
> >  so if you have your SCSI card (IRQ11) in Slot1, Tulip card (IRQ9) in
> > -Slot2, then you'll have to specify this pirq= line:
> > +Slot2, then you'll have to specify this pirq= line::
> >  
> >  	append="pirq=11,9"
> >  
> >  the following script tries to figure out such a default pirq= line from
> > -your PCI configuration:
> > +your PCI configuration::
> >  
> >  	echo -n pirq=; echo `scanpci | grep T_L | cut -c56-` | sed 's/ /,/g'
> >  
> >  note that this script won't work if you have skipped a few slots or if your
> >  board does not do default daisy-chaining. (or the IO-APIC has the PIRQ pins
> >  connected in some strange way). E.g. if in the above case you have your SCSI
> > -card (IRQ11) in Slot3, and have Slot1 empty:
> > +card (IRQ11) in Slot3, and have Slot1 empty::
> >  
> >  	append="pirq=0,9,11"
> >  
> > @@ -105,7 +113,7 @@ won't function properly (e.g. if it's inserted as a module).
> >  If you have 2 PCI buses, then you can use up to 8 pirq values, although such
> >  boards tend to have a good configuration.
> >  
> > -Be prepared that it might happen that you need some strange pirq line:
> > +Be prepared that it might happen that you need some strange pirq line::
> >  
> >  	append="pirq=0,0,0,0,0,0,9,11"
> >  
> > @@ -115,5 +123,3 @@ Good luck and mail to linux-smp@...r.kernel.org or
> >  linux-kernel@...r.kernel.org if you have any problems that are not covered
> >  by this document.
> >  
> > --- mingo
> > -
> > diff --git a/Documentation/x86/i386/index.rst b/Documentation/x86/i386/index.rst
> > new file mode 100644
> > index 000000000000..8747cf5bbd49
> > --- /dev/null
> > +++ b/Documentation/x86/i386/index.rst
> > @@ -0,0 +1,10 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +============
> > +i386 Support
> > +============
> > +
> > +.. toctree::
> > +   :maxdepth: 2
> > +
> > +   IO-APIC
> > diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst
> > index 526f7a008b8e..19323c5b89ce 100644
> > --- a/Documentation/x86/index.rst
> > +++ b/Documentation/x86/index.rst
> > @@ -26,3 +26,4 @@ Linux x86 Support
> >     microcode
> >     resctrl_ui
> >     usb-legacy-support
> > +   i386/index
> 
> 
> 
> Thanks,
> Mauro

-- 
Cheers,
Changbin Du