Trouble with IIO dummy build.

Trouble with IIO dummy build.

[Varsha Rao]

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 Hello,
 
 I am having issues with dummy modules compilation. I have selected the 
required config options.
 $ cat .config | grep IIO 
 And output of it is as listed below.

# CONFIG_SENSORS_IIO_HWMON is not set
CONFIG_DVB_USB_FRIIO=m
# IIO staging drivers
CONFIG_IIO=y
CONFIG_IIO_BUFFER=y
CONFIG_IIO_BUFFER_CB=m
CONFIG_IIO_KFIFO_BUF=y
CONFIG_IIO_TRIGGERED_BUFFER=y
CONFIG_IIO_CONFIGFS=y
CONFIG_IIO_TRIGGER=y
CONFIG_IIO_CONSUMERS_PER_TRIGGER=2
CONFIG_IIO_SW_DEVICE=m
CONFIG_IIO_SW_TRIGGER=m
CONFIG_IIO_TRIGGERED_EVENT=m
CONFIG_IIO_ST_ACCEL_3AXIS=m
CONFIG_IIO_ST_ACCEL_I2C_3AXIS=m
CONFIG_IIO_ST_ACCEL_SPI_3AXIS=m
# Hid Sensor IIO Common
CONFIG_HID_SENSOR_IIO_COMMON=m
CONFIG_HID_SENSOR_IIO_TRIGGER=m
CONFIG_IIO_MS_SENSORS_I2C=m
CONFIG_IIO_SSP_SENSORS_COMMONS=m
CONFIG_IIO_SSP_SENSORHUB=m
CONFIG_IIO_ST_SENSORS_I2C=m
CONFIG_IIO_ST_SENSORS_SPI=m
CONFIG_IIO_ST_SENSORS_CORE=m
# IIO dummy driver
CONFIG_IIO_DUMMY_EVGEN=m
CONFIG_IIO_SIMPLE_DUMMY=m
CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y
CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y
CONFIG_IIO_ST_GYRO_3AXIS=m
CONFIG_IIO_ST_GYRO_I2C_3AXIS=m
CONFIG_IIO_ST_GYRO_SPI_3AXIS=m
CONFIG_INV_MPU6050_IIO=m
CONFIG_IIO_ST_LSM6DSX=m
CONFIG_IIO_ST_LSM6DSX_I2C=m
CONFIG_IIO_ST_LSM6DSX_SPI=m
CONFIG_IIO_ADIS_LIB=y
CONFIG_IIO_ADIS_LIB_BUFFER=y
CONFIG_IIO_ST_MAGN_3AXIS=m
CONFIG_IIO_ST_MAGN_I2C_3AXIS=m
CONFIG_IIO_ST_MAGN_SPI_3AXIS=m
CONFIG_IIO_HRTIMER_TRIGGER=m
CONFIG_IIO_INTERRUPT_TRIGGER=m
CONFIG_IIO_TIGHTLOOP_TRIGGER=m
CONFIG_IIO_SYSFS_TRIGGER=m
# CONFIG_IIO_ST_PRESS is not set

 There is no iio directory created after mounting configfs.
 sudo mount -t configfs none /config

  config]$ ls -a
  .  ..
 
  The following command execute without any error.
  $ make drivers/iio/dummy/iio_dummy_evgen.ko 

 $ make drivers/iio/dummy/iio_dummy.ko

  
  I tried to load module with insmod, SELinux prevented access to it.

    $ insmod iio_dummy_evgen.ko

    $ insmod iio_dummy.ko


 So, I tried to load modules with modprobe. I used the following commands 
and they executed with errors.

  $ sudo modprobe iio_dummy_evgen

  modprobe: ERROR: could not insert 'iio_dummy_evgen': Unknown symbol in 
module, or unknown parameter (see dmesg)


  $ sudo modprobe iio_dummy

  modprobe: ERROR: could not insert 'iio_dummy': Unknown symbol in module, 
or unknown parameter (see dmesg)

 

  dmesg output 

  [ 7093.419225] iio_dummy_evgen: Unknown symbol iio_bus_type (err 0)


 I am using fedora 25 x86_64 with kernel version 4.11.0-rc1+.

  

 Any idea to resolve this issue?


  Thanks,

  Varsha

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Re: Trouble with IIO dummy build.

[Narcisa Vasile]

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Hi, Varsha

Maybe using modinfo command (modinfo iio_dummy.ko for example) will help 
you find more information about what you are trying to insert.
It will output the dependencies, which I think will help you solve this 
problem since it seems to me that the error you got:
"Unknown symbol iio_bus_type" happens because of some missing dependency.

Also, do you get any error message when trying to mount?

Hope this helps,
Narcisa

On Saturday, March 11, 2017 at 4:26:01 PM UTC+2, Varsha Rao wrote:
>
>  
>  Hello,
>  
>  I am having issues with dummy modules compilation. I have selected the 
> required config options.
>  $ cat .config | grep IIO 
>  And output of it is as listed below.
>
> # CONFIG_SENSORS_IIO_HWMON is not set
> CONFIG_DVB_USB_FRIIO=m
> # IIO staging drivers
> CONFIG_IIO=y
> CONFIG_IIO_BUFFER=y
> CONFIG_IIO_BUFFER_CB=m
> CONFIG_IIO_KFIFO_BUF=y
> CONFIG_IIO_TRIGGERED_BUFFER=y
> CONFIG_IIO_CONFIGFS=y
> CONFIG_IIO_TRIGGER=y
> CONFIG_IIO_CONSUMERS_PER_TRIGGER=2
> CONFIG_IIO_SW_DEVICE=m
> CONFIG_IIO_SW_TRIGGER=m
> CONFIG_IIO_TRIGGERED_EVENT=m
> CONFIG_IIO_ST_ACCEL_3AXIS=m
> CONFIG_IIO_ST_ACCEL_I2C_3AXIS=m
> CONFIG_IIO_ST_ACCEL_SPI_3AXIS=m
> # Hid Sensor IIO Common
> CONFIG_HID_SENSOR_IIO_COMMON=m
> CONFIG_HID_SENSOR_IIO_TRIGGER=m
> CONFIG_IIO_MS_SENSORS_I2C=m
> CONFIG_IIO_SSP_SENSORS_COMMONS=m
> CONFIG_IIO_SSP_SENSORHUB=m
> CONFIG_IIO_ST_SENSORS_I2C=m
> CONFIG_IIO_ST_SENSORS_SPI=m
> CONFIG_IIO_ST_SENSORS_CORE=m
> # IIO dummy driver
> CONFIG_IIO_DUMMY_EVGEN=m
> CONFIG_IIO_SIMPLE_DUMMY=m
> CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y
> CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y
> CONFIG_IIO_ST_GYRO_3AXIS=m
> CONFIG_IIO_ST_GYRO_I2C_3AXIS=m
> CONFIG_IIO_ST_GYRO_SPI_3AXIS=m
> CONFIG_INV_MPU6050_IIO=m
> CONFIG_IIO_ST_LSM6DSX=m
> CONFIG_IIO_ST_LSM6DSX_I2C=m
> CONFIG_IIO_ST_LSM6DSX_SPI=m
> CONFIG_IIO_ADIS_LIB=y
> CONFIG_IIO_ADIS_LIB_BUFFER=y
> CONFIG_IIO_ST_MAGN_3AXIS=m
> CONFIG_IIO_ST_MAGN_I2C_3AXIS=m
> CONFIG_IIO_ST_MAGN_SPI_3AXIS=m
> CONFIG_IIO_HRTIMER_TRIGGER=m
> CONFIG_IIO_INTERRUPT_TRIGGER=m
> CONFIG_IIO_TIGHTLOOP_TRIGGER=m
> CONFIG_IIO_SYSFS_TRIGGER=m
> # CONFIG_IIO_ST_PRESS is not set
>
>  There is no iio directory created after mounting configfs.
>  sudo mount -t configfs none /config
>
>   config]$ ls -a
>   .  ..
>  
>   The following command execute without any error.
>   $ make drivers/iio/dummy/iio_dummy_evgen.ko 
>
>  $ make drivers/iio/dummy/iio_dummy.ko
>
>   
>   I tried to load module with insmod, SELinux prevented access to it.
>
>     $ insmod iio_dummy_evgen.ko
>
>     $ insmod iio_dummy.ko
>
>
>  So, I tried to load modules with modprobe. I used the following commands 
> and they executed with errors.
>
>   $ sudo modprobe iio_dummy_evgen
>
>   modprobe: ERROR: could not insert 'iio_dummy_evgen': Unknown symbol in 
> module, or unknown parameter (see dmesg)
>
>
>   $ sudo modprobe iio_dummy
>
>   modprobe: ERROR: could not insert 'iio_dummy': Unknown symbol in module, 
> or unknown parameter (see dmesg)
>
>  
>
>   dmesg output 
>
>   [ 7093.419225] iio_dummy_evgen: Unknown symbol iio_bus_type (err 0)
>
>
>  I am using fedora 25 x86_64 with kernel version 4.11.0-rc1+.
>
>   
>
>  Any idea to resolve this issue?
>
>
>   Thanks,
>
>   Varsha
>

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Re: Trouble with IIO dummy build.

[Varsha Rao]

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 Hey Narcisa,

>
> Maybe using modinfo command (modinfo iio_dummy.ko for example) will help 
> you find more information about what you are trying to insert
>
It will output the dependencies, which I think will help you solve this 
> problem since it seems to me that the error you got:
> "Unknown symbol iio_bus_type" happens because of some missing dependency.
>
     
    I had already checked with modinfo.
    According to  it iio_dummy depends on iio_dummy_evgen and nothing is 
shown for iio_dummy_evgen.
 

> Also, do you get any error message when trying to mount?
>
    
   There was no error message. Thanks Narcisa, I will check again if 
anything else is missing.
     
   Thanks,
   Varsha

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Re: [Outreachy kernel] Trouble with IIO dummy build.

[Daniel Baluta]

On Sat, Mar 11, 2017 at 4:26 PM, Varsha Rao <rvarsha016@gmail.com> wrote:
>
>  Hello,
>
>  I am having issues with dummy modules compilation. I have selected the
> required config options.
>  $ cat .config | grep IIO
>  And output of it is as listed below.
>
> # CONFIG_SENSORS_IIO_HWMON is not set
> CONFIG_DVB_USB_FRIIO=m
> # IIO staging drivers
> CONFIG_IIO=y
> CONFIG_IIO_BUFFER=y
> CONFIG_IIO_BUFFER_CB=m
> CONFIG_IIO_KFIFO_BUF=y
> CONFIG_IIO_TRIGGERED_BUFFER=y
> CONFIG_IIO_CONFIGFS=y

Having this should create /config/iio dir after
mounting configfs.

Can you please add a printk in iio_configfs_init function:

http://lxr.linux.no/#linux+v4.10.1/drivers/iio/industrialio-configfs.c#L37

Then use dmesg to check for the message.

Also, please apply this patch:

http://marc.info/?l=linux-iio&m=148907643001389&w=2

if you use CONFIG_IIO_SW_DEVICE=m

You can workaround the patch above if you select CONFIG_IIO_SW_DEVICE=y


Hope this helps,

Daniel.

Re: [Outreachy kernel] Trouble with IIO dummy build.

[Varsha Rao]

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 Hello,

  Thanks Daniel, finally it worked.

Having this should create /config/iio dir after 
> mounting configfs. 
>
> Can you please add a printk in iio_configfs_init function: 
>
> http://lxr.linux.no/#linux+v4.10.1/drivers/iio/industrialio-configfs.c#L37 
> <http://lxr.linux.no/#linux+v4.10.1/drivers/iio/industrialio-configfs.c%23L37> 
>
> Then use dmesg to check for the message. 
>
 
    Printk message is displayed in dmesg when CONFIG_IIO_SW_DEVICE=m.
   It does not display when CONFIG_IIO_SW_DEVICE=y.
 

> Also, please apply this patch: 
>
> http://marc.info/?l=linux-iio&m=148907643001389&w=2 
>
> if you use CONFIG_IIO_SW_DEVICE=m 
>
> You can workaround the patch above if you select CONFIG_IIO_SW_DEVICE=y 
>
>   
   It works with CONFIG_IIO_SW_DEVICE=m and if patch is applied.
     Both modules got loaded using modprobe.

$ lsmod | grep "iio"
iio_dummy              16384  0
industrialio_sw_device    16384  1 iio_dummy
kfifo_buf              16384  1 iio_dummy
iio_dummy_evgen        16384  1 iio_dummy
industrialio           69632  3 iio_dummy,iio_dummy_evgen,kfifo_buf 
   
    Thanks,
    Varsha

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Re: Trouble with IIO dummy build.

[Varsha Rao]

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Hello,

I am again having issues with dummy modules compilation. I am unable to 
create sub directory after mounting.

 $ sudo mount -t configfs none /config
 $ sudo mkdir /config/iio/devices/dummy/my_dummy_device
  mkdir: cannot create directory 
‘/config/iio/devices/dummy/my_dummy_device’: Invalid argument
 
 I have the following permissions set for the file.

 drwxr-xr-x.  3 root root    0 Mar 15 07:06 .
 dr-xr-xr-x. 19 root root 4096 Mar 14 23:55 ..
 drwxr-xr-x.  3 root root    0 Mar 15 07:06 iio

 I can create sub directory if the directory is not mounted.
 I  also have iio files created in  /sys/kernel/config, even though I have 
not mounted it.  
 $ ls -al /sys/kernel/config/
  total 0
 drwxr-xr-x.  3 root root 0 Mar 15 07:06 .
 drwxr-xr-x. 11 root root 0 Mar 15 06:28 ..
 drwxr-xr-x.  3 root root 0 Mar 15 07:06 iio
 
 As earlier these commands worked, don't know if this is causing the 
problem.
 I tried to mkdir in /config after unmounting  /sys/kernel/config, it did 
not work.
 $ cat /etc/mtab | grep "config"
 configfs /sys/kernel/config configfs rw,relatime 0 0
 none /config configfs rw,relatime 0 0
 
 I am able to run the following commands successfully.
  sudo modprobe iio_dummy_evgen
  sudo modprobe iio_dummy
  sudo mount -t configfs none /config
  ls -l /sys/bus/iio/devices/iio_evgen/

 I am using fedora 25 x86_64 with kernel version 4.11.0-rc1+.
 
 $ cat .config | grep IIO
# CONFIG_SENSORS_IIO_HWMON is not set
CONFIG_DVB_USB_FRIIO=m
# IIO staging drivers
CONFIG_IIO=m
CONFIG_IIO_BUFFER=y
CONFIG_IIO_BUFFER_CB=m
CONFIG_IIO_KFIFO_BUF=m
CONFIG_IIO_TRIGGERED_BUFFER=m
CONFIG_IIO_CONFIGFS=m
CONFIG_IIO_TRIGGER=y
CONFIG_IIO_CONSUMERS_PER_TRIGGER=2
CONFIG_IIO_SW_DEVICE=m
CONFIG_IIO_SW_TRIGGER=m
CONFIG_IIO_ST_ACCEL_3AXIS=m
CONFIG_IIO_ST_ACCEL_I2C_3AXIS=m
CONFIG_IIO_ST_ACCEL_SPI_3AXIS=m
# Hid Sensor IIO Common
CONFIG_HID_SENSOR_IIO_COMMON=m
CONFIG_HID_SENSOR_IIO_TRIGGER=m
# CONFIG_IIO_SSP_SENSORHUB is not set
CONFIG_IIO_ST_SENSORS_I2C=m
CONFIG_IIO_ST_SENSORS_SPI=m
CONFIG_IIO_ST_SENSORS_CORE=m
# IIO dummy driver
CONFIG_IIO_DUMMY_EVGEN=m
CONFIG_IIO_SIMPLE_DUMMY=m
CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y
CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y
CONFIG_IIO_ST_GYRO_3AXIS=m
CONFIG_IIO_ST_GYRO_I2C_3AXIS=m
CONFIG_IIO_ST_GYRO_SPI_3AXIS=m
# CONFIG_IIO_ST_LSM6DSX is not set
CONFIG_IIO_ADIS_LIB=m
CONFIG_IIO_ADIS_LIB_BUFFER=y
CONFIG_IIO_ST_MAGN_3AXIS=m
CONFIG_IIO_ST_MAGN_I2C_3AXIS=m
CONFIG_IIO_ST_MAGN_SPI_3AXIS=m
# CONFIG_IIO_HRTIMER_TRIGGER is not set
CONFIG_IIO_INTERRUPT_TRIGGER=m
CONFIG_IIO_TIGHTLOOP_TRIGGER=m
# CONFIG_IIO_SYSFS_TRIGGER is not set
# CONFIG_IIO_ST_PRESS is not set

 Any ideas?
 
 Thanks,
 Varsha


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Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Alison Schofield]

On Tue, Mar 14, 2017 at 07:07:54PM -0700, Varsha Rao wrote:
> Hello,
> 
> I am again having issues with dummy modules compilation. I am unable to 
> create sub directory after mounting.
> 
>  $ sudo mount -t configfs none /config
>  $ sudo mkdir /config/iio/devices/dummy/my_dummy_device
>   mkdir: cannot create directory 
> ‘/config/iio/devices/dummy/my_dummy_device’: Invalid argument
>  
>  I have the following permissions set for the file.
> 
>  drwxr-xr-x.  3 root root    0 Mar 15 07:06 .
>  dr-xr-xr-x. 19 root root 4096 Mar 14 23:55 ..
>  drwxr-xr-x.  3 root root    0 Mar 15 07:06 iio
> 
>  I can create sub directory if the directory is not mounted.
>  I  also have iio files created in  /sys/kernel/config, even though I have 
> not mounted it.  
>  $ ls -al /sys/kernel/config/
>   total 0
>  drwxr-xr-x.  3 root root 0 Mar 15 07:06 .
>  drwxr-xr-x. 11 root root 0 Mar 15 06:28 ..
>  drwxr-xr-x.  3 root root 0 Mar 15 07:06 iio
>  
>  As earlier these commands worked, don't know if this is causing the 
> problem.
>  I tried to mkdir in /config after unmounting  /sys/kernel/config, it did 
> not work.
>  $ cat /etc/mtab | grep "config"
>  configfs /sys/kernel/config configfs rw,relatime 0 0
>  none /config configfs rw,relatime 0 0
>  
>  I am able to run the following commands successfully.
>   sudo modprobe iio_dummy_evgen
>   sudo modprobe iio_dummy
>   sudo mount -t configfs none /config
>   ls -l /sys/bus/iio/devices/iio_evgen/
> 
>  I am using fedora 25 x86_64 with kernel version 4.11.0-rc1+.

Varsha, 

Do you still have the patch applied?
per Daniel's previous email:

 http://marc.info/?l=linux-iio&m=148907643001389&w=2
 if you use CONFIG_IIO_SW_DEVICE=m

 You can workaround the patch above if you select
 CONFIG_IIO_SW_DEVICE=y


alisons

>  
>  $ cat .config | grep IIO
> # CONFIG_SENSORS_IIO_HWMON is not set
> CONFIG_DVB_USB_FRIIO=m
> # IIO staging drivers
> CONFIG_IIO=m
> CONFIG_IIO_BUFFER=y
> CONFIG_IIO_BUFFER_CB=m
> CONFIG_IIO_KFIFO_BUF=m
> CONFIG_IIO_TRIGGERED_BUFFER=m
> CONFIG_IIO_CONFIGFS=m
> CONFIG_IIO_TRIGGER=y
> CONFIG_IIO_CONSUMERS_PER_TRIGGER=2
> CONFIG_IIO_SW_DEVICE=m
> CONFIG_IIO_SW_TRIGGER=m
> CONFIG_IIO_ST_ACCEL_3AXIS=m
> CONFIG_IIO_ST_ACCEL_I2C_3AXIS=m
> CONFIG_IIO_ST_ACCEL_SPI_3AXIS=m
> # Hid Sensor IIO Common
> CONFIG_HID_SENSOR_IIO_COMMON=m
> CONFIG_HID_SENSOR_IIO_TRIGGER=m
> # CONFIG_IIO_SSP_SENSORHUB is not set
> CONFIG_IIO_ST_SENSORS_I2C=m
> CONFIG_IIO_ST_SENSORS_SPI=m
> CONFIG_IIO_ST_SENSORS_CORE=m
> # IIO dummy driver
> CONFIG_IIO_DUMMY_EVGEN=m
> CONFIG_IIO_SIMPLE_DUMMY=m
> CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y
> CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y
> CONFIG_IIO_ST_GYRO_3AXIS=m
> CONFIG_IIO_ST_GYRO_I2C_3AXIS=m
> CONFIG_IIO_ST_GYRO_SPI_3AXIS=m
> # CONFIG_IIO_ST_LSM6DSX is not set
> CONFIG_IIO_ADIS_LIB=m
> CONFIG_IIO_ADIS_LIB_BUFFER=y
> CONFIG_IIO_ST_MAGN_3AXIS=m
> CONFIG_IIO_ST_MAGN_I2C_3AXIS=m
> CONFIG_IIO_ST_MAGN_SPI_3AXIS=m
> # CONFIG_IIO_HRTIMER_TRIGGER is not set
> CONFIG_IIO_INTERRUPT_TRIGGER=m
> CONFIG_IIO_TIGHTLOOP_TRIGGER=m
> # CONFIG_IIO_SYSFS_TRIGGER is not set
> # CONFIG_IIO_ST_PRESS is not set
> 
>  Any ideas?
>  
>  Thanks,
>  Varsha
> 
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Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Varsha Rao]

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  Hello,

Do you still have the patch applied? 
> per Daniel's previous email: 
>
>  http://marc.info/?l=linux-iio&m=148907643001389&w=2 
>  if you use CONFIG_IIO_SW_DEVICE=m 
>
>  You can workaround the patch above if you select 
>  CONFIG_IIO_SW_DEVICE=y 
>
>      Yes, I have the patch applied. Still it does not work.
     
     Thanks,
     Varsha
 

> alisons 
>
>

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Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Daniel Baluta]

On Wed, Mar 15, 2017 at 4:07 AM, Varsha Rao <rvarsha016@gmail.com> wrote:
> Hello,
>
> I am again having issues with dummy modules compilation. I am unable to
> create sub directory after mounting.
>
>  $ sudo mount -t configfs none /config
>  $ sudo mkdir /config/iio/devices/dummy/my_dummy_device
>   mkdir: cannot create directory
> ‘/config/iio/devices/dummy/my_dummy_device’: Invalid argument
>
>  I have the following permissions set for the file.
>
>  drwxr-xr-x.  3 root root    0 Mar 15 07:06 .
>  dr-xr-xr-x. 19 root root 4096 Mar 14 23:55 ..
>  drwxr-xr-x.  3 root root    0 Mar 15 07:06 iio
>
>  I can create sub directory if the directory is not mounted.
>  I  also have iio files created in  /sys/kernel/config, even though I have
> not mounted it.
>  $ ls -al /sys/kernel/config/
>   total 0
>  drwxr-xr-x.  3 root root 0 Mar 15 07:06 .
>  drwxr-xr-x. 11 root root 0 Mar 15 06:28 ..
>  drwxr-xr-x.  3 root root 0 Mar 15 07:06 iio
>
>  As earlier these commands worked, don't know if this is causing the
> problem.
>  I tried to mkdir in /config after unmounting  /sys/kernel/config, it did
> not work.
>  $ cat /etc/mtab | grep "config"
>  configfs /sys/kernel/config configfs rw,relatime 0 0
>  none /config configfs rw,relatime 0 0
>
>  I am able to run the following commands successfully.
>   sudo modprobe iio_dummy_evgen
>   sudo modprobe iio_dummy
>   sudo mount -t configfs none /config
>   ls -l /sys/bus/iio/devices/iio_evgen/
>
>  I am using fedora 25 x86_64 with kernel version 4.11.0-rc1+.
>
>  $ cat .config | grep IIO
> # CONFIG_SENSORS_IIO_HWMON is not set
> CONFIG_DVB_USB_FRIIO=m
> # IIO staging drivers
> CONFIG_IIO=m

My first thought on this is to compile everything related to IIO as Y
not m. Then we can see
if there is some module dependency etc.

After we make everything work with module compiled in kernel image (y)
we can go back and use your current config.

thanks,
Daniel.

Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Varsha Rao]

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Hello,

>
> My first thought on this is to compile everything related to IIO as Y 
> not m. Then we can see 
> if there is some module dependency etc. 
>
  
   I have configured accordingly but few could not be set to Y, as they 
were dependent on some other module.
   http://pastebin.com/49AvqiGP 
   
   After setting to Y, I am no longer able to load the modules successfully.
   Even though these commands execute with no errors.

   sudo modprobe iio_dummy_evgen
   sudo modprobe iio_dummy
   $ lsmod | grep "iio"  does not give any output.
    
    But I can mount the config directory. After mounting, I cannot create 
sub directory.
  
    $ sudo mount -t configfs none /config
    $ sudo mkdir /config/conf1
    mkdir: cannot create directory ‘/config/conf1’: Operation not permitted
 
   Thanks,
   Varsha

After we make everything work with module compiled in kernel image (y) 
> we can go back and use your current config. 
>
> thanks, 
> Daniel. 
>
 

 

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Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Daniel Baluta]

On Wed, Mar 15, 2017 at 4:58 PM, Varsha Rao <rvarsha016@gmail.com> wrote:
>
> Hello,
>>
>>
>> My first thought on this is to compile everything related to IIO as Y
>> not m. Then we can see
>> if there is some module dependency etc.
>
>
>    I have configured accordingly but few could not be set to Y, as they were
> dependent on some other module.
>    http://pastebin.com/49AvqiGP
>
>    After setting to Y, I am no longer able to load the modules successfully.
>    Even though these commands execute with no errors.

This is fine, because the modules are already in the kernel image.
>
>    sudo modprobe iio_dummy_evgen
>    sudo modprobe iio_dummy
>    $ lsmod | grep "iio"  does not give any output.
>
>     But I can mount the config directory. After mounting, I cannot create
> sub directory.
>
>     $ sudo mount -t configfs none /config
>     $ sudo mkdir /config/conf1
>     mkdir: cannot create directory ‘/config/conf1’: Operation not permitted

You shouldn't need to create a directory inside /config. By selecting
IIO configfs
in the kernel image, after mounting /config dir an /config/iio
directory should be
automatically created.

It means that mounting of configfs failed silently somehow.

Can you tell us the result of mount command? This should list all mounted paths.

thanks,
daniel.

Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Varsha Rao]

  Hello,

> It means that mounting of configfs failed silently somehow.
>
> Can you tell us the result of mount command? This should list all mounted paths.

  Kindly check the link.
  http://pastebin.com/pfuP4cgU

  Thanks,
  Varsha

Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Daniel Baluta]

On Wed, Mar 15, 2017 at 5:44 PM, Varsha Rao <rvarsha016@gmail.com> wrote:
>   Hello,
>
>> It means that mounting of configfs failed silently somehow.
>>
>> Can you tell us the result of mount command? This should list all mounted paths.
>
>   Kindly check the link.
>   http://pastebin.com/pfuP4cgU

Ok, so configfs is already mounted:

configfs on /sys/kernel/config type configfs (rw,relatime)

You should be able to see: /sys/kernel/config/iio and
follow your work from here.

Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Varsha Rao]

Hello,
>>
>>   Kindly check the link.
>>   http://pastebin.com/pfuP4cgU
>
> Ok, so configfs is already mounted:
>
> configfs on /sys/kernel/config type configfs (rw,relatime)
>
> You should be able to see: /sys/kernel/config/iio and
> follow your work from here.

   It is mounted but it does not have iio file.
   $ ls -al /sys/kernel/config/
    total 0
   drwxr-xr-x.  2 root root 0 Mar 16  2017 .
   drwxr-xr-x. 11 root root 0 Mar 16  2017 ..

   The modules did not get loaded.
    As there was no output for $ lsmod | grep "iio"

    Thanks,
    Varsha

Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Ioana Ciornei]

Hi,

> Hello,
>>>
>>>   Kindly check the link.
>>>   http://pastebin.com/pfuP4cgU
>>
>> Ok, so configfs is already mounted:
>>
>> configfs on /sys/kernel/config type configfs (rw,relatime)
>>
>> You should be able to see: /sys/kernel/config/iio and
>> follow your work from here.
>
>    It is mounted but it does not have iio file.
>    $ ls -al /sys/kernel/config/
>     total 0
>    drwxr-xr-x.  2 root root 0 Mar 16  2017 .
>    drwxr-xr-x. 11 root root 0 Mar 16  2017 ..
>
>    The modules did not get loaded.
>     As there was no output for $ lsmod | grep "iio"
>

lsmod does not list the drivers that are compiled into the kernel but
only those that are inserted afterwards.

Ioana


>     Thanks,
>     Varsha
>

Re: [Outreachy kernel] Re: Trouble with IIO dummy build.

[Varsha Rao]

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Hello Ioana, 

>    The modules did not get loaded. 
> >     As there was no output for $ lsmod | grep "iio" 
> > 
>
> lsmod does not list the drivers that are compiled into the kernel but 
> only those that are inserted afterwards. 
>
>     I had used modprobe to load the modules, later I grepped them. But 
iio_dummy_evgen and modprobe iio_dummy were not listed in lsmod.

   Thanks,
   Varsha
    

> Ioana 
>
>
> >     Thanks, 
> >     Varsha 
> > 
>

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