Re: [PATCH v3 0/7] get_abi.pl: Check for missing symbols at the ABI specs

From: Mauro Carvalho Chehab
Date: Tue Sep 21 2021 - 14:16:43 EST

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In reply to: Greg Kroah-Hartman: "Re: [PATCH v3 0/7] get_abi.pl: Check for missing symbols at the ABI specs"
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Em Tue, 21 Sep 2021 18:52:42 +0200
Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> escreveu:

> On Sat, Sep 18, 2021 at 11:52:10AM +0200, Mauro Carvalho Chehab wrote:
> > Hi Greg,
> >
> > Add a new feature at get_abi.pl to optionally check for existing symbols
> > under /sys that won't match a "What:" inside Documentation/ABI.
> >
> > Such feature is very useful to detect missing documentation for ABI.
> >
> > This series brings a major speedup, plus it fixes a few border cases when
> > matching regexes that end with a ".*" or \d+.
> >
> > patch 1 changes get_abi.pl logic to handle multiple What: lines, in
> > order to make the script more robust;
> >
> > patch 2 adds the basic logic. It runs really quicky (up to 2
> > seconds), but it doesn't use sysfs softlinks.
> >
> > Patch 3 adds support for parsing softlinks. It makes the script a
> > lot slower, making it take a couple of minutes to process the entire
> > sysfs files. It could be optimized in the future by using a graph,
> > but, for now, let's keep it simple.
> >
> > Patch 4 adds an optional parameter to allow filtering the results
> > using a regex given by the user. When this parameter is used
> > (which should be the normal usecase), it will only try to find softlinks
> > if the sysfs node matches a regex.
> >
> > Patch 5 improves the report by avoiding it to ignore What: that
> > ends with a wildcard.
> >
> > Patch 6 is a minor speedup. On a Dell Precision 5820, after patch 6,
> > results are:
> >
> > $ time ./scripts/get_abi.pl undefined |sort >undefined && cat undefined| perl -ne 'print "$1\n" if (m#.*/(\S+) not found#)'|sort|uniq -c|sort -nr >undefined_symbols; wc -l undefined; wc -l undefined_symbols
> >
> > real 2m35.563s
> > user 2m34.346s
> > sys 0m1.220s
> > 7595 undefined
> > 896 undefined_symbols
> >
> > Patch 7 makes a *huge* speedup: it basically switches a linear O(n^3)
> > search for links by a logic which handle symlinks using BFS. It
> > also addresses a border case that was making 'msi-irqs/\d+' regex to
> > be misparsed.
> >
> > After patch 7, it is 11 times faster:
> >
> > $ time ./scripts/get_abi.pl undefined |sort >undefined && cat undefined| perl -ne 'print "$1\n" if (m#.*/(\S+) not found#)'|sort|uniq -c|sort -nr >undefined_symbols; wc -l undefined; wc -l undefined_symbols
> >
> > real 0m14.137s
> > user 0m12.795s
> > sys 0m1.348s
> > 7030 undefined
> > 794 undefined_symbols
> >
> > (the difference on the number of undefined symbols are due to the fix for
> > it to properly handle 'msi-irqs/\d+' regex)
> >
> > -
> >
> > While this series is independent from Documentation/ABI changes, it
> > works best when applied from this tree, which also contain ABI fixes
> > and a couple of additions of frequent missed symbols on my machine:
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/mchehab/devel.git/log/?h=get_undefined_abi_v3
>
> I've taken all of these, but get_abi.pl seems to be stuck in an endless
> loop or something. I gave up and stopped it after 14 minutes. It had
> stopped printing out anything after finding all of the pci attributes
> that are not documented :)

It is probably not an endless loop, just there are too many vars to
check on your system, which could make it really slow.

The way the search algorithm works is that reduces the number of regex
expressions that will be checked for a given file entry at sysfs. It
does that by looking at the devnode name. For instance, when it checks for
this file:

/sys/bus/pci/drivers/iosf_mbi_pci/bind

The logic will seek only the "What:" expressions that end with "bind".
Currently, there are just two What expressions for it[1]:

What: /sys/bus/fsl\-mc/drivers/.*/bind
What: /sys/bus/pci/drivers/.*/bind

It will then run an O(n²) algorithm to seek:

foreach my $a (@names) {
foreach my $w (split /\xac/, $what) {
if ($a =~ m#^$w$#) {
exact = 1;
last;
}
}
}

Which runs quickly, when there are few regexs to seek. There are,
however, some What: expressions that end with a wildcard. Those are
harder to process. Right now, they're all grouped together, which
makes them slower. Most of the processing time are spent on those.

I'm working right now on some strategy to also speed up the search
for them. Once I get something better, I'll send a patch series.

--

[1] On a side note, there are currently some problems with the What:
definitions for bind/unbind, as:

- it doesn't match all PCI devices;
- it doesn't match ACPI and other buses that also export
bind/unbind.

>
> Anything I can do to help debug this?
>

There are two parameters that can help to identify the issue:

a) You can add a "--show-hints" parameter. This turns on some
prints that may help to identify what the script is doing.
It is not really a debug option, but it helps to identify
when some regexes are failing.

b) You can limit the What expressions that will be parsed with:
--search-string <something>

You can combine both. For instance, if you want to make it
a lot more verbose, you could run it as:

./scripts/get_abi.pl undefined --search-string /sys --show-hints

The script will then print all regexes that will be checked, and when
actually checking for the missing vars, it will print all names for
a given entry at sysfs.

So, if you want to know how an i2c bind has been validated, you
could do:

$ ./scripts/get_abi.pl undefined --search-string i2c/.*/bind --show-hints
--> /sys/bus/i2c/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3/i2c-14/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-4/i2c-15/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/driver/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2/i2c-13/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-10/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-5/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-3/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1/i2c-12/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-8/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-9/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:15.2/i2c_designware.2/i2c-2/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/driver/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-7/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-6/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/dummy/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-11/subsystem/drivers/dummy/bind
more likely regexes:
/sys/bus/fsl\-mc/drivers/.*/bind
/sys/bus/pci/drivers/.*/bind
--> /sys/bus/i2c/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3/i2c-14/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-4/i2c-15/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2/i2c-13/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-10/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-5/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-3/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1/i2c-12/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-8/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-9/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:15.2/i2c_designware.2/i2c-2/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-7/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-6/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/axp20x-i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-11/subsystem/drivers/axp20x-i2c/bind
more likely regexes:
/sys/bus/fsl\-mc/drivers/.*/bind
/sys/bus/pci/drivers/.*/bind
--> /sys/bus/i2c/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3/i2c-14/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-4/i2c-15/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2/i2c-13/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-10/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-5/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-3/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1/i2c-12/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-8/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-9/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:15.2/i2c_designware.2/i2c-2/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-7/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-6/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/smbus_alert/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-11/subsystem/drivers/smbus_alert/bind
--> /sys/module/i2c_smbus/drivers/i2c:smbus_alert/bind
more likely regexes:
/sys/bus/fsl\-mc/drivers/.*/bind
/sys/bus/pci/drivers/.*/bind
--> /sys/bus/i2c/drivers/ee1004/bind
--> /sys/module/ee1004/drivers/i2c:ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3/i2c-14/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-4/i2c-15/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2/i2c-13/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-10/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-5/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-3/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1/i2c-12/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-8/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-9/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:15.2/i2c_designware.2/i2c-2/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-7/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-6/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-11/subsystem/drivers/ee1004/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/driver/bind
more likely regexes:
/sys/bus/fsl\-mc/drivers/.*/bind
/sys/bus/pci/drivers/.*/bind
--> /sys/bus/i2c/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3/i2c-14/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-4/i2c-15/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2/i2c-13/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-10/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-5/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-3/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1/i2c-12/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-8/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-9/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:15.2/i2c_designware.2/i2c-2/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-7/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-6/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/intel_soc_pmic_i2c/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-11/subsystem/drivers/intel_soc_pmic_i2c/bind
more likely regexes:
/sys/bus/fsl\-mc/drivers/.*/bind
/sys/bus/pci/drivers/.*/bind
--> /sys/bus/i2c/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3/i2c-14/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-4/i2c-15/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2/i2c-13/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-10/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-5/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-3/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1/i2c-12/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-8/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-9/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:15.2/i2c_designware.2/i2c-2/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-7/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-6/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/tps68470/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-11/subsystem/drivers/tps68470/bind
more likely regexes:
/sys/bus/fsl\-mc/drivers/.*/bind
/sys/bus/pci/drivers/.*/bind
--> /sys/bus/i2c/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-3/i2c-14/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-4/i2c-15/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0036/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-2/i2c-13/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0050/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-10/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-5/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-3/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-1/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-DP-1/i2c-12/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/16-0037/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-8/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-9/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:15.2/i2c_designware.2/i2c-2/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:15.0/i2c_designware.0/i2c-0/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:1f.4/i2c-16/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-7/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-6/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/CHT Whiskey Cove PMIC/bind
--> /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/i2c-11/subsystem/drivers/CHT Whiskey Cove PMIC/bind
more likely regexes:
/sys/bus/fsl\-mc/drivers/.*/bind
/sys/bus/pci/drivers/.*/bind

Btw, on the above example, I have already a patch addressing it
(see enclosed). I intend to submit it on a newer patch series.

Thanks,
Mauro

[PATCH] ABI: sysfs-bus-pci: add a alternative What fields

There are some PCI ABI that aren't shown under:

/sys/bus/pci/drivers/.../

Because they're registered with a different class. That's
the case of, for instance:

/sys/bus/i2c/drivers/CHT Whiskey Cove PMIC/unbind

This one is not present under /sys/bus/pci:

$ find /sys/bus/pci -name 'CHT Whiskey Cove PMIC'

Although clearly this is provided by a PCI driver:

/sys/devices/pci0000:00/0000:00:02.0/i2c-4/subsystem/drivers/CHT Whiskey Cove PMIC/unbind

So, add an altertate What location in order to match bind/unbind
to such devices.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index 1da4c8db3a9e..f4efbcb0b18c 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -1,4 +1,5 @@
What: /sys/bus/pci/drivers/.../bind
+What: /sys/devices/pciX/.../bind
Date: December 2003
Contact: linux-pci@xxxxxxxxxxxxxxx
Description:
@@ -14,6 +15,7 @@ Description:
(Note: kernels before 2.6.28 may require echo -n).

What: /sys/bus/pci/drivers/.../unbind
+What: /sys/devices/pciX/.../unbind
Date: December 2003
Contact: linux-pci@xxxxxxxxxxxxxxx
Description:
@@ -29,6 +31,7 @@ Description:
(Note: kernels before 2.6.28 may require echo -n).

What: /sys/bus/pci/drivers/.../new_id
+What: /sys/devices/pciX/.../new_id
Date: December 2003
Contact: linux-pci@xxxxxxxxxxxxxxx
Description:
@@ -47,6 +50,7 @@ Description:
# echo "8086 10f5" > /sys/bus/pci/drivers/foo/new_id

What: /sys/bus/pci/drivers/.../remove_id
+What: /sys/devices/pciX/.../remove_id
Date: February 2009
Contact: Chris Wright <chrisw@xxxxxxxxxxxx>
Description:

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