Can I create a SpiDev device with spi-gpio? - linux-kernel

I'm trying to setup a spidev device with the spi-gpio driver but I can't make it work. I created a spi-gpio device in the device tree as following:
spi4 {
compatible = "spi-gpio";
pinctrl-names = "default";
//pinctrl-0 = <&pinctrl_ecspi1_1>;
#address-cells = <0x1>;
ranges;
gpio-sck = <&gpio4 6 0>;
gpio-mosi = <&gpio3 18 0>;
gpio-miso = <&gpio3 17 0>;
num-chipselects = <1>;
status = "ok";
spidev#0x00 {
compatible = "spidev";
spi-max-frequency = <20000000>;
reg = <0>;
};
but when I try it on my iMX6Q and do: modprobe spi-gpio I got the following error:
[ 29.830946] WARNING: at drivers/gpio/gpiolib.c:126 gpio_to_desc+0x44/0x4c()
[ 29.830954] invalid GPIO -2
[ 29.830959] Modules linked in: spi_gpio(+) usb_f_acm u_serial g_serial libcomposite xxeng [last unloaded: at25]
[ 29.831005] CPU: 3 PID: 908 Comm: modprobe Not tainted 3.10.17-p16163-Q7+gd2d3122 #1
[ 29.831014] Backtrace:
[ 29.831060] [<800128a4>] (dump_backtrace+0x0/0x110) from [<80012abc>] (show_stack+0x18/0x1c)
[ 29.831070] r6:80267514 r5:00000009 r4:d88dfbd0 r3:00000000
[ 29.831115] [<80012aa4>] (show_stack+0x0/0x1c) from [<80552a40>] (dump_stack+0x24/0x28)
[ 29.831146] [<80552a1c>] (dump_stack+0x0/0x28) from [<80026c80>] (warn_slowpath_common+0x5c/0x74)
[ 29.831166] [<80026c24>] (warn_slowpath_common+0x0/0x74) from [<80026cd0>] (warn_slowpath_fmt+0x38/0x40)
[ 29.831171] r8:00000000 r7:00000000 r6:fffffffe r5:d8436e28 r4:d871f140
r3:00000009
[ 29.831203] [<80026c98>] (warn_slowpath_fmt+0x0/0x40) from [<80267514>] (gpio_to_desc+0x44/0x4c)
[ 29.831210] r3:fffffffe r2:806858b8
[ 29.831234] [<802674d0>] (gpio_to_desc+0x0/0x4c) from [<8026886c>] (gpio_request+0x14/0x20)
[ 29.831270] [<80268858>] (gpio_request+0x0/0x20) from [<7f12f750>] (spi_gpio_setup+0x9c/0xe0 [spi_gpio])
[ 29.831282] r4:d865b000 r3:00000000
[ 29.831325] [<7f12f6b4>] (spi_gpio_setup+0x0/0xe0 [spi_gpio]) from [<80357910>] (spi_setup+0x78/0x178)
[ 29.831334] r7:00000000 r6:d819fa10 r5:d8436c00 r4:d865b000
[ 29.831369] [<80357898>] (spi_setup+0x0/0x178) from [<80357bc4>] (spi_add_device+0xbc/0x17c)
[ 29.831382] r9:d819fa10 r8:00000000 r7:00000000 r6:d819fa10 r5:d8436c00
r4:d865b000
[ 29.831432] [<80357b08>] (spi_add_device+0x0/0x17c) from [<80359178>] (spi_register_master+0x620/0x760)
[ 29.831442] r7:d865b174 r6:d865b000 r5:81e1f754 r4:d8436c00
[ 29.831478] [<80358b58>] (spi_register_master+0x0/0x760) from [<8035aa44>] (spi_bitbang_start+0xa4/0x110)
[ 29.831502] [<8035a9a0>] (spi_bitbang_start+0x0/0x110) from [<7f12fa5c>] (spi_gpio_probe+0x2c8/0x45c [spi_gpio])
[ 29.831511] r4:d8764910 r3:8035a2cc
[ 29.831553] [<7f12f794>] (spi_gpio_probe+0x0/0x45c [spi_gpio]) from [<802d84b8>] (platform_drv_probe+0x20/0x24)
[ 29.831577] [<802d8498>] (platform_drv_probe+0x0/0x24) from [<802d6ea4>] (driver_probe_device+0x140/0x384)
[ 29.831596] [<802d6d64>] (driver_probe_device+0x0/0x384) from [<802d71c8>] (__driver_attach+0x94/0x98)
[ 29.831608] r8:00000000 r7:00000000 r6:d819fa44 r5:7f12fecc r4:d819fa10
[ 29.831646] [<802d7134>] (__driver_attach+0x0/0x98) from [<802d4f34>] (bus_for_each_dev+0x68/0x9c)
[ 29.831659] r6:802d7134 r5:7f12fecc r4:00000000 r3:00000000
[ 29.831696] [<802d4ecc>] (bus_for_each_dev+0x0/0x9c) from [<802d6884>] (driver_attach+0x24/0x28)
[ 29.831709] r6:80763840 r5:d84b1c80 r4:7f12fecc
[ 29.831741] [<802d6860>] (driver_attach+0x0/0x28) from [<802d6458>] (bus_add_driver+0x1d8/0x27c)
[ 29.831753] [<802d6280>] (bus_add_driver+0x0/0x27c) from [<802d7838>] (driver_register+0x80/0x148)
[ 29.831764] r7:d88de000 r6:807870c0 r5:7f12ff18 r4:7f12fecc
[ 29.831795] [<802d77b8>] (driver_register+0x0/0x148) from [<802d8b70>] (platform_driver_register+0x58/0x60)
[ 29.831807] r8:00000000 r7:d88de000 r6:807870c0 r5:7f12ff18 r4:d88dff48
r3:00000000
[ 29.831842] [<802d8b18>] (platform_driver_register+0x0/0x60) from [<7f132014>] (spi_gpio_driver_init+0x14/0x1c [spi_gpio])
[ 29.831857] [<7f132000>] (spi_gpio_driver_init+0x0/0x1c [spi_gpio]) from [<8000867c>] (do_one_initcall+0xe0/0x18c)
[ 29.831885] [<8000859c>] (do_one_initcall+0x0/0x18c) from [<8006fcb0>] (load_module+0x1be8/0x223c)
[ 29.831911] [<8006e0c8>] (load_module+0x0/0x223c) from [<800704a4>] (SyS_finit_module+0x88/0xb8)
[ 29.831938] [<8007041c>] (SyS_finit_module+0x0/0xb8) from [<8000f080>] (ret_fast_syscall+0x0/0x30)
[ 29.831947] r6:00000000 r5:00000000 r4:00000000
[ 29.831966] ---[ end trace 689f08d95c191798 ]---
[ 29.831978] gpiod_request: invalid GPIO
[ 29.832003] spi_gpio spi4.22: can't setup spi32762.0, status -22
[ 29.838036] spi_master spi32762: spi_device register error /spi4/spidev#0x00
[ 29.846522] ------------[ cut here ]------------
[ 29.846559] WARNING: at drivers/gpio/gpiolib.c:126 gpio_to_desc+0x44/0x4c()
[ 29.846567] invalid GPIO -2
[ 29.846572] Modules linked in: spi_gpio(+) usb_f_acm u_serial g_serial libcomposite xxeng [last unloaded: at25]
[ 29.846603] CPU: 3 PID: 908 Comm: modprobe Tainted: G W 3.10.17-p16163-Q7+gd2d3122 #1
[ 29.846610] Backtrace:
[ 29.846634] [<800128a4>] (dump_backtrace+0x0/0x110) from [<80012abc>] (show_stack+0x18/0x1c)
[ 29.846640] r6:80267514 r5:00000009 r4:d88dfbb0 r3:00000000
[ 29.846663] [<80012aa4>] (show_stack+0x0/0x1c) from [<80552a40>] (dump_stack+0x24/0x28)
[ 29.846679] [<80552a1c>] (dump_stack+0x0/0x28) from [<80026c80>] (warn_slowpath_common+0x5c/0x74)
[ 29.846689] [<80026c24>] (warn_slowpath_common+0x0/0x74) from [<80026cd0>] (warn_slowpath_fmt+0x38/0x40)
[ 29.846694] r8:d865b008 r7:d871f140 r6:00000000 r5:d865b000 r4:d865b000
r3:00000009
[ 29.846716] [<80026c98>] (warn_slowpath_fmt+0x0/0x40) from [<80267514>] (gpio_to_desc+0x44/0x4c)
[ 29.846720] r3:fffffffe r2:806858b8
[ 29.846737] [<802674d0>] (gpio_to_desc+0x0/0x4c) from [<80269be8>] (gpio_free+0x10/0x18)
[ 29.846756] [<80269bd8>] (gpio_free+0x0/0x18) from [<7f12f6a8>] (spi_gpio_cleanup+0x30/0x3c [spi_gpio])
[ 29.846776] [<7f12f678>] (spi_gpio_cleanup+0x0/0x3c [spi_gpio]) from [<80357ae8>] (spidev_release+0x24/0x44)
[ 29.846781] r4:d865b000 r3:d8436c00
[ 29.846807] [<80357ac4>] (spidev_release+0x0/0x44) from [<802d2a8c>] (device_release+0x34/0x98)
[ 29.846812] r4:d865b008 r3:80357ac4
[ 29.846831] [<802d2a58>] (device_release+0x0/0x98) from [<80247938>] (kobject_release+0x9c/0x1b4)
[ 29.846836] r6:80763588 r5:d865b024 r4:8077dae0 r3:802d2a58
[ 29.846860] [<8024789c>] (kobject_release+0x0/0x1b4) from [<80247aa0>] (kobject_put+0x50/0x7c)
[ 29.846867] r8:00000000 r7:d865b174 r6:d865b000 r5:81e1f754 r4:d865b008
[ 29.846889] [<80247a50>] (kobject_put+0x0/0x7c) from [<802d2ddc>] (put_device+0x1c/0x20)
[ 29.846894] r4:d8436c00
[ 29.846914] [<802d2dc0>] (put_device+0x0/0x20) from [<8035919c>] (spi_register_master+0x644/0x760)
[ 29.846938] [<80358b58>] (spi_register_master+0x0/0x760) from [<8035aa44>] (spi_bitbang_start+0xa4/0x110)
[ 29.846959] [<8035a9a0>] (spi_bitbang_start+0x0/0x110) from [<7f12fa5c>] (spi_gpio_probe+0x2c8/0x45c [spi_gpio])
[ 29.846971] r4:d8764910 r3:8035a2cc
[ 29.847002] [<7f12f794>] (spi_gpio_probe+0x0/0x45c [spi_gpio]) from [<802d84b8>] (platform_drv_probe+0x20/0x24)
[ 29.847024] [<802d8498>] (platform_drv_probe+0x0/0x24) from [<802d6ea4>] (driver_probe_device+0x140/0x384)
[ 29.847043] [<802d6d64>] (driver_probe_device+0x0/0x384) from [<802d71c8>] (__driver_attach+0x94/0x98)
[ 29.847051] r8:00000000 r7:00000000 r6:d819fa44 r5:7f12fecc r4:d819fa10
[ 29.847082] [<802d7134>] (__driver_attach+0x0/0x98) from [<802d4f34>] (bus_for_each_dev+0x68/0x9c)
[ 29.847092] r6:802d7134 r5:7f12fecc r4:00000000 r3:00000000
[ 29.847125] [<802d4ecc>] (bus_for_each_dev+0x0/0x9c) from [<802d6884>] (driver_attach+0x24/0x28)
[ 29.847135] r6:80763840 r5:d84b1c80 r4:7f12fecc
[ 29.847152] [<802d6860>] (driver_attach+0x0/0x28) from [<802d6458>] (bus_add_driver+0x1d8/0x27c)
[ 29.847164] [<802d6280>] (bus_add_driver+0x0/0x27c) from [<802d7838>] (driver_register+0x80/0x148)
[ 29.847171] r7:d88de000 r6:807870c0 r5:7f12ff18 r4:7f12fecc
[ 29.847193] [<802d77b8>] (driver_register+0x0/0x148) from [<802d8b70>] (platform_driver_register+0x58/0x60)
[ 29.847198] r8:00000000 r7:d88de000 r6:807870c0 r5:7f12ff18 r4:d88dff48
r3:00000000
[ 29.847239] [<802d8b18>] (platform_driver_register+0x0/0x60) from [<7f132014>] (spi_gpio_driver_init+0x14/0x1c [spi_gpio])
[ 29.847260] [<7f132000>] (spi_gpio_driver_init+0x0/0x1c [spi_gpio]) from [<8000867c>] (do_one_initcall+0xe0/0x18c)
[ 29.847281] [<8000859c>] (do_one_initcall+0x0/0x18c) from [<8006fcb0>] (load_module+0x1be8/0x223c)
[ 29.847294] [<8006e0c8>] (load_module+0x0/0x223c) from [<800704a4>] (SyS_finit_module+0x88/0xb8)
[ 29.847311] [<8007041c>] (SyS_finit_module+0x0/0xb8) from [<8000f080>] (ret_fast_syscall+0x0/0x30)
[ 29.847318] r6:00000000 r5:00000000 r4:00000000
[ 29.847334] ---[ end trace 689f08d95c191799 ]---
I understand there is an invalid setting, so my question is, can I use the spidev inside a spi-gpio? If not, what would be the closest driver that can provide a user space driver for doing that?
Or, if it's just a regular error, how do I debug this?

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Zend Service Manager - Service not found exception when trying to use phpdebugbar

I'm trying to use https://github.com/php-middleware/phpdebugbar in a clean Zend Expressive Skeleton application.
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Note, I've also tried following these instructions. And while there is no error, it doesn't seem like it's showing up at all:
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I'm sure I'm missing some key part, but what is it that I'm missing?
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I figured it out. The instructions at https://docs.zendframework.com/zend-expressive/v3/cookbook/debug-toolbars/ are correct. The only additional step which is required is adding invokables and aliases entries to the configuration.
Mine were in /config/autoload/zend-expressive-tooling-factories.global.php:
return [
'dependencies' => [
'invokables' => [
Zend\Diactoros\ResponseFactory::class => Zend\Diactoros\ResponseFactory::class,
Zend\Diactoros\StreamFactory::class => Zend\Diactoros\StreamFactory::class,
],
'aliases' => [
Psr\Http\Message\ResponseFactoryInterface::class => Zend\Diactoros\ResponseFactory::class,
Psr\Http\Message\StreamFactoryInterface::class => Zend\Diactoros\StreamFactory::class,
]
],
];
I originally just had the aliases section and not the invokables section. Once I added that, everything just worked.

try creating an alias first and then provide it to a factory
return [
'dependencies' => [
'factories' => [
Psr\Http\Message\ResponseInterface::class => Zend\Diactoros\ResponseFactory::class,
'Psr\Http\Message\StreamFactoryInterface' => Zend\Diactoros\StreamFactory::class,
],
'aliases' => [
ClassThatImplementsResponseInterface::class => Psr\Http\Message\ResponseInterface::class,
ClassThatImplementsStreamFactoryInterface::class => 'Psr\Http\Message\StreamFactoryInterface',
]
],
];
UPDATE:
As #d.lanza38 discovered this is the wright configuration
return [
'dependencies' => [
'invokables' => [
Zend\Diactoros\ResponseFactory::class => Zend\Diactoros\ResponseFactory::class,
Zend\Diactoros\StreamFactory::class => Zend\Diactoros\StreamFactory::class,
],
'aliases' => [
Psr\Http\Message\ResponseFactoryInterface::class => Zend\Diactoros\ResponseFactory::class,
Psr\Http\Message\StreamFactoryInterface::class => Zend\Diactoros\StreamFactory::class,
]
],
];

I am writing an other answer as it is easier to read.
OK. I just did a fresh install of Zend Expressive 3 and https://github.com/php-middleware/phpdebugbar:
composer require --dev php-middleware/php-debug-bar
composer dump-autoload
Created /config/autoload/debugbar.local.php
return array_merge(PhpMiddleware\PhpDebugBar\ConfigProvider::getConfig(), [
'phpmiddleware' => [
'phpdebugbar' => [
'javascript_renderer' => [
'base_url' => '/razvan.ionascu/ze-api/public',
],
'collectors' => [
DebugBar\DataCollector\ConfigCollector::class, // Service names of collectors
],
'storage' => null, // Service name of storage
],
],
'dependencies' => [
'factories' => [
\PhpMiddleware\PhpDebugBar\PhpDebugBarMiddleware::class => \PhpMiddleware\PhpDebugBar\PhpDebugBarMiddlewareFactory::class,
\DebugBar\DataCollector\ConfigCollector::class => \PhpMiddleware\PhpDebugBar\ConfigCollectorFactory::class,
\PhpMiddleware\PhpDebugBar\ConfigProvider::class => \PhpMiddleware\PhpDebugBar\ConfigProvider::class,
\DebugBar\DebugBar::class => \PhpMiddleware\PhpDebugBar\StandardDebugBarFactory::class,
JavascriptRenderer::class => NewJavascriptRendererFactory::class,
],
],
]);
For this to work you need to create a new JavascriptRendererFactory. The current one seaches for the wrong config key, ConfigProvider::class instead of 'config' :
class NewJavascriptRendererFactory
{
public function __invoke(ContainerInterface $container): JavascriptRenderer
{
$debugbar = $container->get(DebugBar::class);
$config = $container->get('config');
$rendererOptions = $config['phpmiddleware']['phpdebugbar']['javascript_renderer'];
$renderer = new JavascriptRenderer($debugbar);
$renderer->setOptions($rendererOptions);
return $renderer;
}
}
added the following aliases and factories to /confog/atuoload/dependencies.global.php
'aliases' => [
\Psr\Http\Message\ResponseFactoryInterface::class => ResponseFactory::class,
\Psr\Http\Message\StreamFactoryInterface::class => StreamFactory::class,
],
'factories' => [
...
\DebugBar\JavascriptRenderer::class => JavascriptRendererFactory::class,
...
],
Added a new pipeline to /config/pipeline.php
//only works in development mode
if (!empty($container->get('config')['debug'])) {
$app->pipe(\PhpMiddleware\PhpDebugBar\PhpDebugBarMiddleware::class);
}
As I mentioned in an earlier comment, I have also configured https://docs.zendframework.com/zend-servicemanager/reflection-abstract-factory/ , so I don't need to create a factory for each service()
See the working debug bar here

Group facts in prolog by 3 variables

I'm having troubles grouping some facts in prolog by 3 different properties.
This is my knownledge base (a graph basically):
% entity(Label, Id)
% relationship(Type, Subject, Object)
entity('Person', id_0).
entity('Place', 1468).
relationship('wasIn', id_0, 1468).
entity('Place', 1367).
relationship('wasIn', 1468, 1367).
entity('Person', 1466).
relationship('wasIn', 1466, 1468).
entity('Place', 1478).
relationship('aliasOf', 1478, 1468).
entity('Place', 1052).
relationship('wasIn', id_0, 1052).
entity('Place', 1184).
relationship('wasIn', 1052, 1184).
entity('Person', 1048).
relationship('wasIn', 1048, 1052).
entity('Place', 1069).
relationship('wasIn', id_0, 1069).
entity('Place', 1070).
relationship('wasIn', 1069, 1070).
entity('Person', 1068).
relationship('wasIn', 1068, 1069).
I wanted to group relationships by each entity id and subject type, so to get something like:
[
[
[id_0, wasIn, Place],
% because entities 1468, 1052, 1069 are Places
[ relationship(wasIn, id_0, 1468),
relationship(wasIn, id_0, 1052),
relationship(wasIn, id_0, 1069)]
],
[
[id_0, wasIn, Some Other Subject Label],
[relationship(wasIn, id_0, ...),
...]
],
[
[1468, wasIn, Place],
[relationship(wasIn, 1468, ...),
...]
],
...
]
and so forth.
For now, I managed to group by subject and type only. Sadly, I'm getting duplicates out from it (which I wanted to avoid). Any further attempt I tried didn't work, that's why I'm asking here.
This are my current rules:
group_relationships_by_node([[Subject, Type] | [R]]) :-
entity(_, Subject),
relationship(Type, Subject, _),
findall(relationship(Type, Subject, Object), relationship(Type, Subject, Object), R).
group_by_relationships(Result) :-
findall(X, group_relationships_by_node(X), Result).
this is my current result:
[
[
[id_0, wasIn],
[ relationship(wasIn, id_0, 1468),
relationship(wasIn, id_0, 1052),
relationship(wasIn, id_0, 1069) ]
],
% duplicate
[
[id_0, wasIn],
[ relationship(wasIn, id_0, 1468),
relationship(wasIn, id_0, 1052),
relationship(wasIn, id_0, 1069) ]
],
% duplicate
[
[id_0, wasIn],
[ relationship(wasIn, id_0, 1468),
relationship(wasIn, id_0, 1052),
relationship(wasIn, id_0, 1069) ]
],
[
[ 1468, wasIn ],
[ relationship(wasIn, 1468, 1367) ]
],
[
[ 1466, wasIn ],
[ relationship(wasIn, 1466, 1468) ]
],
[
[ 1478, aliasOf ],
[ relationship(aliasOf, 1478, 1468) ]
],
[
[ 1052, wasIn ],
[ relationship(wasIn, 1052, 1184) ]
],
[
[ 1048, wasIn ],
[ relationship(wasIn, 1048, 1052) ]
],
[
[ 1069, wasIn ],
[ relationship(wasIn, 1069, 1070) ]
],
[
[ 1068, wasIn ],
[ relationship(wasIn, 1068, 1069) ]
]
]
Alas,
I don't know prolog very well myself,
I hope you can even suggest me a better solution.
Thank you very much

So,
this is my attempt. It does work, but please let me know if a better solution exists (considering a dedup rule that removes duplicates from a list)
get_subject_ids(Subjects) :-
findall(Subject, entity(_, Subject), Subjects).
get_relationship_by_type_subject_objectLabel(Type, Subject, ObjectLabel, Result) :-
entity(ObjectLabel, Object),
relationship(Type, Subject, Object),
Result = relationship(Type, Subject, Object).
iterate_labels(_, _, [], []).
iterate_labels(Subject, Type, [ObjectLabel | Rest], [[ObjectLabel, Result] | ResultRest]) :-
findall(Rel, get_relationship_by_type_subject_objectLabel(Type, Subject, ObjectLabel, Rel), Result),
iterate_labels(Subject, Type, Rest, ResultRest).
iterate_objects([], []).
iterate_objects([Object | Rest], [ObjectLabel | ResultRest]) :-
entity(ObjectLabel, Object),
iterate_objects(Rest, ResultRest).
iterate_types(_, [], []).
iterate_types(Subject, [Type | Rest], [[Type, GroupedRels] | ResultRest]) :-
% find all relationships with type Type starting from Subject
% findall(relationship(Type, Subject, Object), relationship(Type, Subject, Object), Rels),
findall(Object, relationship(Type, Subject, Object), Objects),
iterate_objects(Objects, MObjects),
dedup(MObjects, ObjectLabels),
iterate_labels(Subject, Type, ObjectLabels, GroupedRels),
iterate_types(Subject, Rest, ResultRest).
iterate_subjects([], []).
iterate_subjects([Subject | Rest], [[Subject, Result] | ResultRest]) :-
findall(Type, relationship(Type, Subject, _), DTypes),
dedup(DTypes, Types),
iterate_types(Subject, Types, Result),
iterate_subjects(Rest, ResultRest).
main :-
get_subject_ids(Subjects),
iterate_subjects(Subjects, Result),
writeln(Result).
The result is something like:
[
[
id_0,
[
[
wasIn,
[
[
Place,
[
relationship(wasIn,
id_0,
1468),
relationship(wasIn,
id_0,
1052)
]
],
[
Placez,
[
relationship(wasIn,
id_0,
1069)
]
]
]
]
]
],
[
1468,
[
[
wasIn,
[
[
Place,
[
relationship(wasIn,
1468,
1367)
]
]
]
]
]
],
[
1367,
[
]
],
[
1466,
[
[
wasIn,
[
[
Place,
[
relationship(wasIn,
1466,
1468)
]
]
]
]
]
],
[
1478,
[
[
aliasOf,
[
[
Place,
[
relationship(aliasOf,
1478,
1468)
]
]
]
]
]
],
[
1052,
[
[
wasIn,
[
[
Place,
[
relationship(wasIn,
1052,
1184)
]
]
]
]
]
],
[
1184,
[
]
],
[
1048,
[
[
wasIn,
[
[
Place,
[
relationship(wasIn,
1048,
1052)
]
]
]
]
]
],
[
1069,
[
[
wasIn,
[
[
Place,
[
relationship(wasIn,
1069,
1070)
]
]
]
]
]
],
[
1070,
[
]
],
[
1068,
[
[
wasIn,
[
[
Placez,
[
relationship(wasIn,
1068,
1069)
]
]
]
]
]
]
]
which is fine

How does linux kernel lockdep record lock-class dependency?

I got a warning as below which is a AB-BA deadlock issue. But I don't understand how the 'existing dependency' happened.
It looks like: kvm_read_guest() held (&mm->mmap_sem), then reading userspace memory (which is not ready yet) caused page_fault() invoked, then in i915_gem_fault() it tries to hold lock class (&dev->struct_mutex) which only has one instance.
But this sequence must haven't happened. Otherwise, double-lock already happed, since intel_vgpu_create_workload() has held (&dev->struct_mutex) already:
(&dev->struct_mutex)->(&mm->mmap_sem)->(&dev->struct_mutex)
So how could lockdep find such 'existing dependency'?
Another question is '#0 (&mm->mmap_sem)' is held by __might_fault()->might_lock_read(). But might_lock_read() only temporarily accquire the lock. Then why there is a lock sequence "(&mm->mmap_sem)->(&dev->struct_mutex)"?
[ 113.934800] ======================================================
[ 113.940963] WARNING: possible circular locking dependency detected
[ 113.947131] 4.16.0-rc5+ #44 Tainted: G U
[ 113.952257] ------------------------------------------------------
[ 113.958424] qemu-system-x86/4298 is trying to acquire lock:
[ 113.963983] (&mm->mmap_sem){++++}, at: [<0000000052776050>] __might_fault+0x36/0x80
[ 113.971716]
but task is already holding lock:
[ 113.977542] (&dev->struct_mutex){+.+.}, at: [<000000002a25c66b>] intel_vgpu_create_workload+0x3d1/0x550 [i915]
[ 113.987643]
which lock already depends on the new lock.
[ 113.995801]
the existing dependency chain (in reverse order) is:
[ 114.003268]
-> #1 (&dev->struct_mutex){+.+.}:
[ 114.009113] i915_mutex_lock_interruptible+0x66/0x170 [i915]
[ 114.015301] i915_gem_fault+0x1d0/0x620 [i915]
[ 114.020273] __do_fault+0x19/0xed
[ 114.024108] __handle_mm_fault+0x9fa/0x1140
[ 114.028806] handle_mm_fault+0x1a7/0x390
[ 114.033240] __do_page_fault+0x286/0x530
[ 114.037677] page_fault+0x45/0x50
[ 114.041503]
-> #0 (&mm->mmap_sem){++++}:
[ 114.046901] __might_fault+0x60/0x80
[ 114.051008] __kvm_read_guest_page+0x3d/0x80 [kvm]
[ 114.056319] kvm_read_guest+0x47/0x80 [kvm]
[ 114.061024] kvmgt_rw_gpa+0x9d/0x110 [kvmgt]
[ 114.065833] copy_gma_to_hva+0x71/0x100 [i915]
[ 114.070818] intel_gvt_scan_and_shadow_ringbuffer+0xc4/0x210 [i915]
[ 114.077617] intel_gvt_scan_and_shadow_workload+0xc7/0x480 [i915]
[ 114.084240] intel_vgpu_create_workload+0x3d9/0x550 [i915]
[ 114.090258] intel_vgpu_submit_execlist+0xc0/0x2a0 [i915]
[ 114.096190] elsp_mmio_write+0xcb/0x140 [i915]
[ 114.101170] intel_vgpu_mmio_reg_rw+0x250/0x4f0 [i915]
[ 114.106845] intel_vgpu_emulate_mmio_write+0xaa/0x240 [i915]
[ 114.113014] intel_vgpu_rw+0x200/0x250 [kvmgt]
[ 114.117972] intel_vgpu_write+0x164/0x1f0 [kvmgt]
[ 114.123188] __vfs_write+0x33/0x170
[ 114.127192] vfs_write+0xc5/0x1c0
[ 114.131022] SyS_pwrite64+0x90/0xb0
[ 114.135025] do_syscall_64+0x70/0x1c0
[ 114.139203] entry_SYSCALL_64_after_hwframe+0x42/0xb7
[ 114.144765]
other info that might help us debug this:
[ 114.152754] Possible unsafe locking scenario:
[ 114.158664] CPU0 CPU1
[ 114.163185] ---- ----
[ 114.167714] lock(&dev->struct_mutex);
[ 114.171541] lock(&mm->mmap_sem);
[ 114.177449] lock(&dev->struct_mutex);
[ 114.183790] lock(&mm->mmap_sem);
[ 114.187186]
*** DEADLOCK ***
[ 114.193095] 3 locks held by qemu-system-x86/4298:
[ 114.197789] #0: (&gvt->lock){+.+.}, at: [<0000000087b40252>] intel_vgpu_emulate_mmio_write+0x64/0x240 [i915]
[ 114.207792] #1: (&dev->struct_mutex){+.+.}, at: [<000000002a25c66b>] intel_vgpu_create_workload+0x3d1/0x550 [i915]
[ 114.218314] #2: (&kvm->srcu){....}, at: [<00000000e49701e8>] kvmgt_rw_gpa+0x4c/0x110 [kvmgt]
[ 114.226913]
stack backtrace:
[ 114.231263] CPU: 0 PID: 4298 Comm: qemu-system-x86 Tainted: G U 4.16.0-rc5+ #44
[ 114.239771] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.2.8 01/26/2016
[ 114.247155] Call Trace:
[ 114.249600] dump_stack+0x7c/0xbe
[ 114.252909] print_circular_bug.isra.33+0x21b/0x228
[ 114.257781] __lock_acquire+0xf7d/0x1470
[ 114.261698] ? lock_acquire+0xec/0x1e0
[ 114.265440] lock_acquire+0xec/0x1e0
[ 114.269008] ? __might_fault+0x36/0x80
[ 114.272749] __might_fault+0x60/0x80
[ 114.276317] ? __might_fault+0x36/0x80
[ 114.280066] __kvm_read_guest_page+0x3d/0x80 [kvm]
[ 114.284856] kvm_read_guest+0x47/0x80 [kvm]
[ 114.289042] kvmgt_rw_gpa+0x9d/0x110 [kvmgt]
[ 114.293333] copy_gma_to_hva+0x71/0x100 [i915]
[ 114.297797] intel_gvt_scan_and_shadow_ringbuffer+0xc4/0x210 [i915]
[ 114.304091] intel_gvt_scan_and_shadow_workload+0xc7/0x480 [i915]
[ 114.310206] intel_vgpu_create_workload+0x3d9/0x550 [i915]
[ 114.315709] intel_vgpu_submit_execlist+0xc0/0x2a0 [i915]
[ 114.321140] elsp_mmio_write+0xcb/0x140 [i915]
[ 114.325596] intel_vgpu_mmio_reg_rw+0x250/0x4f0 [i915]
[ 114.330746] intel_vgpu_emulate_mmio_write+0xaa/0x240 [i915]
[ 114.336396] intel_vgpu_rw+0x200/0x250 [kvmgt]
[ 114.340833] intel_vgpu_write+0x164/0x1f0 [kvmgt]
[ 114.345533] __vfs_write+0x33/0x170
[ 114.349016] ? common_file_perm+0x68/0x250
[ 114.353104] ? security_file_permission+0x36/0xb0
[ 114.357803] vfs_write+0xc5/0x1c0
[ 114.361113] SyS_pwrite64+0x90/0xb0
[ 114.364597] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 114.369293] do_syscall_64+0x70/0x1c0
[ 114.372950] entry_SYSCALL_64_after_hwframe+0x42/0xb7
[ 114.377994] RIP: 0033:0x7f0ca8a29da3
[ 114.381562] RSP: 002b:00007f0c98dc96c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000012
[ 114.389121] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0ca8a29da3
[ 114.396240] RDX: 0000000000000004 RSI: 00007f0c98dc96f0 RDI: 0000000000000019
[ 114.403362] RBP: 00007f0c98dc9710 R08: 0000000000000004 R09: 00000000ffffffff
[ 114.410484] R10: 0000000000002230 R11: 0000000000000293 R12: 0000000000000000
[ 114.417605] R13: 00007ffdd628d02f R14: 00007f0c98dca9c0 R15: 0000000000000000
in function intel_vgpu_create_workload:
mutex_lock(&dev_priv->drm.struct_mutex);
ret = intel_gvt_scan_and_shadow_workload(workload);
mutex_unlock(&dev_priv->drm.struct_mutex);

Unable to resolve 271.0: missing requirement [271.0] package; (&(package =org.apache.cxf.jaxrs.client)(version>=2.7.0)(!(version>=3.0.0)))

I am trying to install my bundle and I get the following error:
org.osgi.framework.BundleException: Unresolved constraint in bundle horizon-util [271]: Unable to resolve 271.0: missing requirement [271.0] package; (&(package
=org.apache.cxf.jaxrs.client)(version>=2.7.0)(!(version>=3.0.0)))
Bundle ID: 271
these are my bundles :
karaf#root> osgi:list
START LEVEL 100 , List Threshold: 50
ID State Blueprint Spring Level Name
[ 45] [Active ] [ ] [ ] [ 50] geronimo-j2ee-management_1.1_spec (1.0.1)
[ 46] [Active ] [ ] [ ] [ 50] Commons Collections (3.2.1)
[ 47] [Active ] [ ] [ ] [ 50] Apache ServiceMix :: Bundles :: jasypt (1.9.0.1)
[ 48] [Active ] [ ] [ ] [ 50] geronimo-jms_1.1_spec (1.1.1)
[ 49] [Active ] [ ] [ ] [ 50] Commons Pool (1.6.0)
[ 50] [Active ] [ ] [ ] [ 50] Apache ServiceMix :: Bundles :: xpp3 (1.1.0.4c_5)
[ 51] [Active ] [ ] [ ] [ 50] Apache ServiceMix Bundles: dom4j-1.6.1 (1.6.1.2)
[ 52] [Active ] [ ] [ ] [ 50] Commons Lang (2.6)
[ 53] [Active ] [ ] [ ] [ 50] Apache ServiceMix Bundles: oro-2.0.8 (2.0.8.3)
[ 54] [Active ] [ ] [ ] [ 50] Apache ServiceMix :: Specs :: Stax API 1.0 (1.9.0)
[ 55] [Active ] [ ] [ ] [ 50] Apache ServiceMix Bundles: xstream-1.3 (1.3.0.3)
[ 56] [Active ] [ ] [ ] [ 50] Apache ServiceMix :: Bundles :: jdom (1.1.0.4)
[ 57] [Active ] [ ] [ ] [ 50] Apache ServiceMix :: Bundles :: velocity (1.7.0.4)
[ 58] [Active ] [ ] [ ] [ 50] Apache Aries Transaction Manager (0.3.0)
[ 59] [Active ] [ ] [ ] [ 50] kahadb (5.7.0)
[ 60] [Active ] [ ] [ ] [ 50] activemq-pool (5.7.0)
[ 61] [Active ] [ ] [ ] [ 50] activemq-console (5.7.0)
[ 62] [Active ] [ ] [ ] [ 50] activemq-ra (5.7.0)
[ 63] [Active ] [Created ] [ ] [ 50] activemq-core (5.7.0)
Fragments: 68
[ 64] [Active ] [Created ] [ ] [ 50] activemq-karaf (5.7.0)
[ 65] [Active ] [Created ] [ ] [ 50] Apache XBean :: OSGI Blueprint Namespace Handler (3.11.1)
[ 66] [Active ] [ ] [ ] [ 50] Commons JEXL (2.0.1)
[ 67] [Active ] [ ] [ ] [ 50] Apache ServiceMix :: Specs :: Scripting API 1.0 (1.9.0)
[ 68] [Resolved ] [ ] [ ] [ 50] activemq-blueprint (5.7.0)
Hosts: 63
[ 69] [Active ] [Created ] [ ] [ 50] activemq-broker.xml (0.0.0)
[ 83] [Active ] [ ] [ ] [ 50] Joda-Time (1.6.2)
[ 84] [Active ] [ ] [ ] [ 50] Apache XBean :: Spring (3.11.1)
[ 85] [Active ] [ ] [ ] [ 50] activemq-spring (5.7.0)
[ 99] [Active ] [Created ] [ ] [ 50] camel-karaf-commands (2.10.7)
[ 100] [Active ] [ ] [ ] [ 50] camel-core (2.10.7)
[ 102] [Active ] [ ] [ ] [ 50] camel-spring (2.10.7)
[ 103] [Active ] [Created ] [ ] [ 50] camel-blueprint (2.10.7)
[ 106] [Active ] [ ] [ ] [ 50] camel-jms (2.10.7)
[ 107] [Active ] [ ] [ ] [ 50] activemq-camel (5.7.0)
[ 172] [Active ] [ ] [ ] [ 50] Apache CXF Compatibility Bundle Jar (2.6.9)
[ 173] [Active ] [Created ] [ ] [ 50] camel-cxf (2.10.7)
[ 174] [Active ] [ ] [ ] [ 50] camel-cxf-transport (2.10.7)
[ 181] [Resolved ] [ ] [ ] [ 80] simple-camel-blueprint.xml (0.0.0)
[ 182] [Active ] [ ] [ ] [ 50] camel-stream (2.10.7)
[ 188] [Installed ] [ ] [ ] [ 80] ERP-blueprint.xml (0.0.0)
[ 199] [Active ] [ ] [ ] [ 50] camel-sql (2.10.7)
[ 204] [Installed ] [ ] [ ] [ 80] horizon-core (0.0.1)
[ 206] [Active ] [ ] [ ] [ 50] Data mapper for Jackson JSON processor (1.9.10)
[ 207] [Active ] [ ] [ ] [ 50] Jackson JSON processor (1.9.10)
[ 208] [Active ] [ ] [ ] [ 50] camel-jackson (2.10.7)
[ 209] [Active ] [ ] [ ] [ 50] MongoDB Java Driver (2.11.2.RELEASE)
[ 259] [Installed ] [ ] [ ] [ 80] Spring Data MongoDB Support (1.3.3.RELEASE)
[ 269] [Installed ] [ ] [ ] [ 80] horizon-util (0.0.1)
Do I need to update Apache CXF to 2.7.0 version?
And how do I do that?
I tried to update the bundle but it did not work.
Thank you for any pointer

your horizon-util bundle depends on bundle org.apache.cxf.jaxrs.client with version greater than and equal to 2.7.0.
So try to install appropriate version to resolve the error.

In my case I've installed Apache CXF without Camel so I will give you the steps for this scenario but maybe it will work the same way for Camel.
So, to remove the current version first you have to remove the repository:
feature:repo-list
--> gives you the list of repositories (in my case cxf-2.x.x)
feature:repo-remove cxf-2.x.x
--> removes the repository from Karaf
feature:repo-add mvn:org.apache.cxf.karaf/apache-cxf/2.7.10/xml/features
--> Adds new version of CXF repository (in this case 2.7.0)
feature:install cxf-jaxrs
--> Installs the part of CXF you need (or cxf instead of cxf-jaxrs if we need all)
feature:list | grep cxf
--> shows a list of bundles related to CXF. [x] means that they are started
I hope this will help you.

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